Add 'Files' field to the 'Config'. Add 'Value' field to the 'FieldParseError'

Add -f/--config-file flag for loading YAML configs from local or remote sources. Fix error handling to return unmatched errors.

.dockerignore

@@ -1,11 +0,0 @@
-.github
-assets
-binaries
-dodo
-.git
-.gitignore
-.golangci.yml
-README.md
-LICENSE
-config.json
-build.sh

.github/workflows/golangci-lint.yml

@@ -19,7 +19,7 @@ jobs:
         with:
           go-version: stable
       - name: golangci-lint
-        uses: golangci/golangci-lint-action@v6
+        uses: golangci/golangci-lint-action@v7
         with:
-          version: v1.64
+          version: v2.4.0
           args: --timeout=10m --config=.golangci.yml

.golangci.yml

@@ -1,27 +1,135 @@
+version: "2"
+
 run:
-  go: "1.24"
-  concurrency: 8
-  timeout: 10m
+    go: "1.25"
+    concurrency: 8
+    timeout: 10m
 
 linters:
-  disable-all: true
-  enable:
-    - asasalint
-    - asciicheck
-    - gofmt
-    - goimports
-    - gomodguard
-    - goprintffuncname
-    - govet
-    - ineffassign
-    - misspell
-    - nakedret
-    - nolintlint
-    - prealloc
-    - prealloc
-    - reassign
-    - staticcheck
-    - typecheck
-    - unconvert
-    - unused
-    - whitespace
+    default: none
+    enable:
+        - asasalint
+        - asciicheck
+        - errcheck
+        - gomodguard
+        - goprintffuncname
+        - govet
+        - ineffassign
+        - misspell
+        - nakedret
+        - nolintlint
+        - prealloc
+        - reassign
+        - staticcheck
+        - unconvert
+        - unused
+        - whitespace
+        - bidichk
+        - bodyclose
+        - containedctx
+        - contextcheck
+        - copyloopvar
+        - decorder
+        - dogsled
+        - dupword
+        - durationcheck
+        - embeddedstructfieldcheck
+        - errchkjson
+        - errorlint
+        - exhaustive
+        - exptostd
+        - fatcontext
+        - forcetypeassert
+        - funcorder
+        - ginkgolinter
+        - gocheckcompilerdirectives
+        - gochecknoinits
+        - gochecksumtype
+        - goconst
+        - gocritic
+        - gocyclo
+        - godox
+        - goheader
+        - gomoddirectives
+        - gosec
+        - gosmopolitan
+        - grouper
+        - iface
+        - importas
+        - inamedparam
+        - interfacebloat
+        - intrange
+        - loggercheck
+        - makezero
+        - mirror
+        - musttag
+        - nilerr
+        - nilnesserr
+        - nilnil
+        - noctx
+        - nonamedreturns
+        - nosprintfhostport
+        - perfsprint
+        - predeclared
+        - promlinter
+        - protogetter
+        - sloglint
+        - spancheck
+        - sqlclosecheck
+        - tagalign
+        - tagliatelle
+        - testableexamples
+        - testifylint
+        - thelper
+        - tparallel
+        - unparam
+        - usestdlibvars
+        - usetesting
+        - varnamelen
+        - wastedassign
+        - wrapcheck
+        - zerologlint
+
+    settings:
+        staticcheck:
+            checks:
+                - "all"
+                - "-S1002"
+                - "-ST1000"
+        varnamelen:
+            ignore-decls:
+                - i int
+
+    exclusions:
+        rules:
+            - path: _test\.go$
+              linters:
+                  - errorlint
+                  - forcetypeassert
+                  - perfsprint
+                  - errcheck
+                  - gosec
+                  - gocyclo
+
+            - path: _test\.go$
+              linters:
+                  - staticcheck
+              text: "SA5011"
+
+formatters:
+    enable:
+        - gofmt
+
+    settings:
+        gofmt:
+            # Simplify code: gofmt with `-s` option.
+            # Default: true
+            simplify: false
+            # Apply the rewrite rules to the source before reformatting.
+            # https://pkg.go.dev/cmd/gofmt
+            # Default: []
+            rewrite-rules:
+                - pattern: "interface{}"
+                  replacement: "any"
+                - pattern: "a[b:len(a)]"
+                  replacement: "a[b:]"

Dockerfile

@@ -1,19 +1,17 @@
-FROM golang:1.24-alpine AS builder
+FROM golang:1.25-alpine AS builder
 
-WORKDIR /dodo
+WORKDIR /src
 
 COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
 
-RUN go build -ldflags "-s -w" -o dodo
-RUN echo "{}" > config.json
+RUN CGO_ENABLED=0 go build -ldflags "-s -w" -o dodo
 
 FROM gcr.io/distroless/static-debian12:latest
 
-WORKDIR /dodo
+WORKDIR /
 
-COPY --from=builder /dodo/dodo /dodo/dodo
-COPY --from=builder /dodo/config.json /dodo/config.json
+COPY --from=builder /src/dodo /dodo
 
-ENTRYPOINT ["./dodo", "-c", "/dodo/config.json"]
+ENTRYPOINT ["./dodo"]

LICENSE

@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2024 Aykhan Shahsuvarov
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.

Makefile

@@ -1,9 +0,0 @@
-lint:
-	golangci-lint run
-
-build:
-	go build -ldflags "-s -w" -o "./dodo"
-
-build-all:
-	rm -rf ./binaries
-	./build.sh

README.md

@@ -1,133 +0,0 @@
-<h1 align="center">Dodo is a simple and easy-to-use HTTP benchmarking tool.</h1>
-<p align="center">
-<img width="30%" height="30%" src="https://ftp.aykhans.me/web/client/pubshares/hB6VSdCnBCr8gFPeiMuCji/browse?path=%2Fdodo.png">
-</p>
-
-## Installation
-### With Docker (Recommended)
-Pull the Dodo image from Docker Hub:
-```sh
-docker pull aykhans/dodo:latest
-```
-If you use Dodo with Docker and a config file, you must provide the config.json file as a volume to the Docker run command (not as the "-c config.json" argument), as shown in the examples in the [usage](#usage) section.
-
-### With Binary File
-You can grab binaries in the [releases](https://github.com/aykhans/dodo/releases) section.
-
-### Build from Source
-To build Dodo from source, you need to have [Go1.22+](https://golang.org/dl/) installed. <br>
-Follow the steps below to build dodo:
-
-1. **Clone the repository:**
-
-    ```sh
-    git clone https://github.com/aykhans/dodo.git
-    ```
-
-2. **Navigate to the project directory:**
-
-    ```sh
-    cd dodo
-    ```
-
-3. **Build the project:**
-
-    ```sh
-    go build -ldflags "-s -w" -o dodo
-    ```
-
-This will generate an executable named `dodo` in the project directory.
-
-## Usage
-You can use Dodo with CLI arguments, a JSON config file, or both. If you use both, CLI arguments will always override JSON config arguments if there is a conflict.
-
-### 1. CLI
-Send 1000 GET requests to https://example.com with 10 parallel dodos (threads) and a timeout of 2000 milliseconds:
-
-```sh
-dodo -u https://example.com -m GET -d 10 -r 1000 -t 2000
-```
-With Docker:
-```sh
-docker run --rm -i aykhans/dodo -u https://example.com -m GET -d 10 -r 1000 -t 2000
-```
-
-### 2. JSON config file
-You can find an example config structure in the [config.json](https://github.com/aykhans/dodo/blob/main/config.json) file:
-```jsonc
-{
-    "method": "GET",
-    "url": "https://example.com",
-    "no_proxy_check": false,
-    "timeout": 10000,
-    "dodos": 1,
-    "requests": 1,
-    "params": {
-        // Random param value will be selected from the param-key1 and param-key2 list for each request
-        "param-key1": ["param-value1", "param-value2", "param-value3"],
-        "param-key2": ["param-value1", "param-value2", "param-value3"]
-    },
-    "headers": {
-        // Random header value will be selected from the header-key1 and header-key2 list for each request
-        "header-key1": ["header-value1", "header-value2", "header-value3"],
-        "header-key2": ["header-value2", "header-value2", "header-value3"]
-    },
-    "cookies": {
-        // Random cookie value will be selected from the cookie-key1 and cookie-key2 list for each request
-        "cookie-key1": ["cookie-value1", "cookie-value2", "cookie-value3"],
-        "cookie-key2": ["cookie-value2", "cookie-value2", "cookie-value3"]
-    },
-    // Random body value will be selected from the body list for each request
-    "body": ["body1", "body2", "body3"],
-    // Random proxy will be selected from the proxy list for each request
-    "proxies": [
-        {
-            "url": "http://example.com:8080",
-            "username": "username",
-            "password": "password"
-        },
-        {
-            "url": "http://example.com:8080"
-        }
-    ]
-}
-```
-Send 1000 GET requests to https://example.com with 10 parallel dodos (threads) and a timeout of 2000 milliseconds:
-
-```sh
-dodo -c /path/config.json
-```
-With Docker:
-```sh
-docker run --rm -i -v ./path/config.json:/dodo/config.json aykhans/dodo
-```
-
-### 3. Both (CLI & JSON)
-Override the config file arguments with CLI arguments:
-
-```sh
-dodo -c /path/config.json -u https://example.com -m GET -d 10 -r 1000 -t 2000
-```
-With Docker:
-```sh
-docker run --rm -i -v ./path/config.json:/dodo/config.json aykhans/dodo -u https://example.com -m GET -d 10 -r 1000 -t 2000
-```
-
-## CLI and JSON Config Parameters
-If the Headers, Params, Cookies and Body fields have multiple values, each request will choose a random value from the list.
-
-| Parameter             | JSON config file | CLI Flag        | CLI Short Flag | Type                             | Description                                                         | Default     |
-| --------------------- | ---------------- | --------------- | -------------- | -------------------------------- | ------------------------------------------------------------------- | ----------- |
-| Config file           | -                | --config-file   | -c             | String                           | Path to the JSON config file                                        | -           |
-| Yes                   | -                | --yes           | -y             | Boolean                          | Answer yes to all questions                                         | false       |
-| URL                   | url              | --url           | -u             | String                           | URL to send the request to                                          | -           |
-| Method                | method           | --method        | -m             | String                           | HTTP method                                                         | GET         |
-| Requests              | requests         | --requests      | -r             | Integer                          | Total number of requests to send                                    | 1000        |
-| Dodos (Threads)       | dodos            | --dodos         | -d             | Integer                          | Number of dodos (threads) to send requests in parallel              | 1           |
-| Timeout               | timeout          | --timeout       | -t             | Integer                          | Timeout for canceling each request (milliseconds)                   | 10000       |
-| No Proxy Check        | no_proxy_check   | --no-proxy-check| -              | Boolean                          | Disable proxy check                                                 | false       |
-| Params                | params           | -               | -              | Key-Value {String: [String]}     | Request parameters                                                  | -           |
-| Headers               | headers          | -               | -              | Key-Value {String: [String]}     | Request headers                                                     | -           |
-| Cookies               | cookies          | -               | -              | Key-Value {String: [String]}     | Request cookies                                                     | -           |
-| Body                  | body             | -               | -              | [String]                         | Request body                                                        | -           |
-| Proxy                 | proxies          | -               | -              | List[Key-Value {string: string}] | List of proxies (will check active proxies before sending requests) | -           |

Taskfile.yaml

@@ -0,0 +1,20 @@
+# https://taskfile.dev
+
+version: "3"
+
+tasks:
+    run: go run cmd/cli/main.go {{.CLI_ARGS}}
+
+    ftl:
+        cmds:
+            - task: fmt
+            - task: tidy
+            - task: lint
+
+    fmt: golangci-lint fmt
+
+    tidy: go mod tidy
+
+    lint: golangci-lint run
+
+    test: go test ./...

build.sh

@@ -1,32 +0,0 @@
-#!/bin/bash
-
-platforms=(
-    "darwin,amd64"
-    "darwin,arm64"
-    "freebsd,386"
-    "freebsd,amd64"
-    "freebsd,arm"
-    "linux,386"
-    "linux,amd64"
-    "linux,arm"
-    "linux,arm64"
-    "netbsd,386"
-    "netbsd,amd64"
-    "netbsd,arm"
-    "openbsd,386"
-    "openbsd,amd64"
-    "openbsd,arm"
-    "openbsd,arm64"
-    "windows,386"
-    "windows,amd64"
-    "windows,arm64"
-)
-
-for platform in "${platforms[@]}"; do
-    IFS=',' read -r build_os build_arch <<< "$platform"
-    ext=""
-    if [ "$build_os" == "windows" ]; then
-        ext=".exe"
-    fi
-    GOOS="$build_os" GOARCH="$build_arch" go build -ldflags "-s -w" -o "./binaries/dodo-$build_os-$build_arch$ext"
-done

cmd/cli/main.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/aykhans/dodo/pkg/config"
+	"github.com/aykhans/dodo/pkg/types"
+	"github.com/aykhans/dodo/pkg/utils"
+	"github.com/jedib0t/go-pretty/v6/text"
+)
+
+func main() {
+	cliParser := config.NewConfigCLIParser(os.Args)
+	cfg, err := cliParser.Parse()
+
+	_ = utils.HandleErrorOrDie(err,
+		utils.OnSentinelError(types.ErrCLINoArgs, func(err error) error {
+			cliParser.PrintHelp()
+			utils.PrintErrAndExit(text.FgRed, 1, "\nNo arguments provided.")
+			return nil
+		}),
+		utils.OnCustomError(func(err types.CLIUnexpectedArgsError) error {
+			cliParser.PrintHelp()
+			utils.PrintErrAndExit(text.FgRed, 1, "\nUnexpected CLI arguments provided: %v", err.Args)
+			return nil
+		}),
+		utils.OnCustomError(func(err types.FieldParseErrors) error {
+			cliParser.PrintHelp()
+			fmt.Println()
+			printValidationErrors("CLI", err.Errors...)
+			fmt.Println()
+			os.Exit(1)
+			return nil
+		}),
+	)
+
+	fmt.Println(cfg)
+}
+
+func printValidationErrors(parserName string, errors ...types.FieldParseError) {
+	for _, fieldErr := range errors {
+		if fieldErr.Value == "" {
+			utils.PrintErr(text.FgYellow, "[%s] Field '%s': %v", parserName, fieldErr.Field, fieldErr.Err)
+		}
+		utils.PrintErr(text.FgYellow, "[%s] Field '%s' (%s): %v", parserName, fieldErr.Field, fieldErr.Value, fieldErr.Err)
+	}
+}

config.json

@@ -1,31 +0,0 @@
-{
-    "method": "GET",
-    "url": "https://example.com",
-    "no_proxy_check": false,
-    "timeout": 10000,
-    "dodos": 1,
-    "requests": 1,
-    "params": {
-        "param-key1": ["param-value1", "param-value2", "param-value3"],
-        "param-key2": ["param-value1", "param-value2", "param-value3"]
-    },
-    "headers": {
-        "header-key1": ["header-value1", "header-value2", "header-value3"],
-        "header-key2": ["header-value2", "header-value2", "header-value3"]
-    },
-    "cookies": {
-        "cookie-key1": ["cookie-value1", "cookie-value2", "cookie-value3"],
-        "cookie-key2": ["cookie-value2", "cookie-value2", "cookie-value3"]
-    },
-    "body": ["body1", "body2", "body3"],
-    "proxies": [
-        {
-            "url": "http://example.com:8080",
-            "username": "username",
-            "password": "password"
-        },
-        {
-            "url": "http://example.com:8080"
-        }
-    ]
-}

config/config.go

@@ -1,245 +0,0 @@
-package config
-
-import (
-	"net/url"
-	"os"
-	"strings"
-	"time"
-
-	. "github.com/aykhans/dodo/types"
-	"github.com/aykhans/dodo/utils"
-	"github.com/jedib0t/go-pretty/v6/table"
-)
-
-const (
-	VERSION                 string = "0.5.7"
-	DefaultUserAgent        string = "Dodo/" + VERSION
-	ProxyCheckURL           string = "https://www.google.com"
-	DefaultMethod           string = "GET"
-	DefaultTimeout          uint32 = 10000 // Milliseconds (10 seconds)
-	DefaultDodosCount       uint   = 1
-	DefaultRequestCount     uint   = 1
-	MaxDodosCountForProxies uint   = 20 // Max dodos count for proxy check
-)
-
-type RequestConfig struct {
-	Method       string
-	URL          *url.URL
-	Timeout      time.Duration
-	DodosCount   uint
-	RequestCount uint
-	Params       map[string][]string
-	Headers      map[string][]string
-	Cookies      map[string][]string
-	Proxies      []Proxy
-	Body         []string
-	Yes          bool
-	NoProxyCheck bool
-}
-
-func (config *RequestConfig) Print() {
-	t := table.NewWriter()
-	t.SetOutputMirror(os.Stdout)
-	t.SetStyle(table.StyleLight)
-	t.SetColumnConfigs([]table.ColumnConfig{
-		{
-			Number: 2,
-			WidthMaxEnforcer: func(col string, maxLen int) string {
-				lines := strings.Split(col, "\n")
-				for i, line := range lines {
-					if len(line) > maxLen {
-						lines[i] = line[:maxLen-3] + "..."
-					}
-				}
-				return strings.Join(lines, "\n")
-			},
-			WidthMax: 50},
-	})
-
-	newHeaders := make(map[string][]string)
-	newHeaders["User-Agent"] = []string{DefaultUserAgent}
-	for k, v := range config.Headers {
-		newHeaders[k] = v
-	}
-
-	t.AppendHeader(table.Row{"Request Configuration"})
-	t.AppendRow(table.Row{"Method", config.Method})
-	t.AppendSeparator()
-	t.AppendRow(table.Row{"URL", config.URL})
-	t.AppendSeparator()
-	t.AppendRow(table.Row{"Timeout", config.Timeout})
-	t.AppendSeparator()
-	t.AppendRow(table.Row{"Dodos", config.DodosCount})
-	t.AppendSeparator()
-	t.AppendRow(table.Row{"Requests", config.RequestCount})
-	t.AppendSeparator()
-	t.AppendRow(table.Row{"Params", string(utils.PrettyJSONMarshal(config.Params, 3, "", "  "))})
-	t.AppendSeparator()
-	t.AppendRow(table.Row{"Headers", string(utils.PrettyJSONMarshal(newHeaders, 3, "", "  "))})
-	t.AppendSeparator()
-	t.AppendRow(table.Row{"Cookies", string(utils.PrettyJSONMarshal(config.Cookies, 3, "", "  "))})
-	t.AppendSeparator()
-	t.AppendRow(table.Row{"Proxies", string(utils.PrettyJSONMarshal(config.Proxies, 3, "", "  "))})
-	t.AppendSeparator()
-	t.AppendRow(table.Row{"Proxy Check", !config.NoProxyCheck})
-	t.AppendSeparator()
-	t.AppendRow(table.Row{"Body", string(utils.PrettyJSONMarshal(config.Body, 3, "", "  "))})
-
-	t.Render()
-}
-
-func (config *RequestConfig) GetValidDodosCountForRequests() uint {
-	return min(config.DodosCount, config.RequestCount)
-}
-
-func (config *RequestConfig) GetValidDodosCountForProxies() uint {
-	return min(config.DodosCount, uint(len(config.Proxies)), MaxDodosCountForProxies)
-}
-
-func (config *RequestConfig) GetMaxConns(minConns uint) uint {
-	maxConns := max(
-		minConns, config.GetValidDodosCountForRequests(),
-	)
-	return ((maxConns * 50 / 100) + maxConns)
-}
-
-type Config struct {
-	Method       string       `json:"method" validate:"http_method"` // custom validations: http_method
-	URL          string       `json:"url" validate:"http_url,required"`
-	Timeout      uint32       `json:"timeout" validate:"gte=1,lte=100000"`
-	DodosCount   uint         `json:"dodos" validate:"gte=1"`
-	RequestCount uint         `json:"requests" validation_name:"request-count" validate:"gte=1"`
-	NoProxyCheck Option[bool] `json:"no_proxy_check"`
-}
-
-func NewConfig(
-	method string,
-	timeout uint32,
-	dodosCount uint,
-	requestCount uint,
-	noProxyCheck Option[bool],
-) *Config {
-	if noProxyCheck == nil {
-		noProxyCheck = NewNoneOption[bool]()
-	}
-
-	return &Config{
-		Method:       method,
-		Timeout:      timeout,
-		DodosCount:   dodosCount,
-		RequestCount: requestCount,
-		NoProxyCheck: noProxyCheck,
-	}
-}
-
-func (config *Config) MergeConfigs(newConfig *Config) {
-	if newConfig.Method != "" {
-		config.Method = newConfig.Method
-	}
-	if newConfig.URL != "" {
-		config.URL = newConfig.URL
-	}
-	if newConfig.Timeout != 0 {
-		config.Timeout = newConfig.Timeout
-	}
-	if newConfig.DodosCount != 0 {
-		config.DodosCount = newConfig.DodosCount
-	}
-	if newConfig.RequestCount != 0 {
-		config.RequestCount = newConfig.RequestCount
-	}
-	if !newConfig.NoProxyCheck.IsNone() {
-		config.NoProxyCheck = newConfig.NoProxyCheck
-	}
-}
-
-func (config *Config) SetDefaults() {
-	if config.Method == "" {
-		config.Method = DefaultMethod
-	}
-	if config.Timeout == 0 {
-		config.Timeout = DefaultTimeout
-	}
-	if config.DodosCount == 0 {
-		config.DodosCount = DefaultDodosCount
-	}
-	if config.RequestCount == 0 {
-		config.RequestCount = DefaultRequestCount
-	}
-	if config.NoProxyCheck.IsNone() {
-		config.NoProxyCheck = NewOption(false)
-	}
-}
-
-type Proxy struct {
-	URL      string `json:"url" validate:"required,proxy_url"`
-	Username string `json:"username"`
-	Password string `json:"password"`
-}
-
-type JSONConfig struct {
-	*Config
-	Params  map[string][]string `json:"params"`
-	Headers map[string][]string `json:"headers"`
-	Cookies map[string][]string `json:"cookies"`
-	Proxies []Proxy             `json:"proxies" validate:"dive"`
-	Body    []string            `json:"body"`
-}
-
-func NewJSONConfig(
-	config *Config,
-	params map[string][]string,
-	headers map[string][]string,
-	cookies map[string][]string,
-	proxies []Proxy,
-	body []string,
-) *JSONConfig {
-	return &JSONConfig{
-		config, params, headers, cookies, proxies, body,
-	}
-}
-
-func (config *JSONConfig) MergeConfigs(newConfig *JSONConfig) {
-	config.Config.MergeConfigs(newConfig.Config)
-	if len(newConfig.Params) != 0 {
-		config.Params = newConfig.Params
-	}
-	if len(newConfig.Headers) != 0 {
-		config.Headers = newConfig.Headers
-	}
-	if len(newConfig.Cookies) != 0 {
-		config.Cookies = newConfig.Cookies
-	}
-	if len(newConfig.Body) != 0 {
-		config.Body = newConfig.Body
-	}
-	if len(newConfig.Proxies) != 0 {
-		config.Proxies = newConfig.Proxies
-	}
-}
-
-type CLIConfig struct {
-	*Config
-	Yes        Option[bool] `json:"yes" validate:"omitempty"`
-	ConfigFile string       `validation_name:"config-file" validate:"omitempty,filepath"`
-}
-
-func NewCLIConfig(
-	config *Config,
-	yes Option[bool],
-	configFile string,
-) *CLIConfig {
-	return &CLIConfig{
-		config, yes, configFile,
-	}
-}
-
-func (config *CLIConfig) MergeConfigs(newConfig *CLIConfig) {
-	config.Config.MergeConfigs(newConfig.Config)
-	if newConfig.ConfigFile != "" {
-		config.ConfigFile = newConfig.ConfigFile
-	}
-	if !newConfig.Yes.IsNone() {
-		config.Yes = newConfig.Yes
-	}
-}

custom_errors/errors.go

@@ -1,117 +0,0 @@
-package customerrors
-
-import (
-	"errors"
-	"fmt"
-
-	"github.com/go-playground/validator/v10"
-)
-
-var (
-	ErrInvalidJSON = errors.New("invalid JSON file")
-	ErrInvalidFile = errors.New("invalid file")
-	ErrInterrupt   = errors.New("interrupted")
-	ErrNoInternet  = errors.New("no internet connection")
-	ErrTimeout     = errors.New("timeout")
-)
-
-func As(err error, target any) bool {
-	return errors.As(err, target)
-}
-
-func Is(err, target error) bool {
-	return errors.Is(err, target)
-}
-
-type Error interface {
-	Error() string
-	Unwrap() error
-}
-
-type TypeError struct {
-	Expected string
-	Received string
-	Field    string
-	err      error
-}
-
-func NewTypeError(expected, received, field string, err error) *TypeError {
-	return &TypeError{
-		Expected: expected,
-		Received: received,
-		Field:    field,
-		err:      err,
-	}
-}
-
-func (e *TypeError) Error() string {
-	return "Expected " + e.Expected + " but received " + e.Received + " in field " + e.Field
-}
-
-func (e *TypeError) Unwrap() error {
-	return e.err
-}
-
-type InvalidFileError struct {
-	FileName string
-	err      error
-}
-
-func NewInvalidFileError(fileName string, err error) *InvalidFileError {
-	return &InvalidFileError{
-		FileName: fileName,
-		err:      err,
-	}
-}
-
-func (e *InvalidFileError) Error() string {
-	return "Invalid file: " + e.FileName
-}
-
-func (e *InvalidFileError) Unwrap() error {
-	return e.err
-}
-
-type FileNotFoundError struct {
-	FileName string
-	err      error
-}
-
-func NewFileNotFoundError(fileName string, err error) *FileNotFoundError {
-	return &FileNotFoundError{
-		FileName: fileName,
-		err:      err,
-	}
-}
-
-func (e *FileNotFoundError) Error() string {
-	return "File not found: " + e.FileName
-}
-
-func (e *FileNotFoundError) Unwrap() error {
-	return e.err
-}
-
-type ValidationErrors struct {
-	MapErrors map[string]string
-	errors    validator.ValidationErrors
-}
-
-func NewValidationErrors(errsMap map[string]string, errs validator.ValidationErrors) *ValidationErrors {
-	return &ValidationErrors{
-		MapErrors: errsMap,
-		errors:    errs,
-	}
-}
-
-func (errs *ValidationErrors) Error() string {
-	var errorsStr string
-	for k, v := range errs.MapErrors {
-		errorsStr += fmt.Sprintf("[%s]: %s\n", k, v)
-	}
-	return errorsStr
-}
-
-func (errs *ValidationErrors) Unwrap() error {
-	return errs.errors
-}

custom_errors/formaters.go

@@ -1,68 +0,0 @@
-package customerrors
-
-import (
-	"fmt"
-	"net"
-	"net/url"
-	"strings"
-
-	"github.com/go-playground/validator/v10"
-)
-
-func OSErrorFormater(err error) error {
-	errStr := err.Error()
-	if strings.Contains(errStr, "no such file or directory") {
-		fileName1 := strings.Index(errStr, "open")
-		fileName2 := strings.LastIndex(errStr, ":")
-		return NewFileNotFoundError(errStr[fileName1+5:fileName2], err)
-	}
-	return ErrInvalidFile
-}
-
-func shortenNamespace(namespace string) string {
-	return namespace[strings.Index(namespace, ".")+1:]
-}
-
-func ValidationErrorsFormater(errs validator.ValidationErrors) error {
-	errsStr := make(map[string]string)
-	for _, err := range errs {
-		switch err.Tag() {
-		case "required":
-			errsStr[shortenNamespace(err.Namespace())] = fmt.Sprintf("Field \"%s\" is required", err.Field())
-		case "gte":
-			errsStr[shortenNamespace(err.Namespace())] = fmt.Sprintf("Value of \"%s\" must be greater than or equal to \"%s\"", err.Field(), err.Param())
-		case "lte":
-			errsStr[shortenNamespace(err.Namespace())] = fmt.Sprintf("Value of \"%s\" must be less than or equal to \"%s\"", err.Field(), err.Param())
-		case "filepath":
-			errsStr[shortenNamespace(err.Namespace())] = fmt.Sprintf("Invalid file path for \"%s\" field: \"%s\"", err.Field(), err.Value())
-		case "http_url":
-			errsStr[shortenNamespace(err.Namespace())] =
-				fmt.Sprintf("Invalid url for \"%s\" field: \"%s\"", err.Field(), err.Value())
-		// --------------------------------------| Custom validations |--------------------------------------
-		case "http_method":
-			errsStr[shortenNamespace(err.Namespace())] = fmt.Sprintf("Invalid HTTP method for \"%s\" field: \"%s\"", err.Field(), err.Value())
-		case "proxy_url":
-			errsStr[shortenNamespace(err.Namespace())] = fmt.Sprintf("Invalid proxy url for \"%s\" field: \"%s\" (it must be http, socks5 or socks5h)", err.Field(), err.Value())
-		case "string_bool":
-			errsStr[shortenNamespace(err.Namespace())] = fmt.Sprintf("Invalid value for \"%s\" field: \"%s\"", err.Field(), err.Value())
-		default:
-			errsStr[shortenNamespace(err.Namespace())] = fmt.Sprintf("Invalid value for \"%s\" field: \"%s\"", err.Field(), err.Value())
-		}
-	}
-	return NewValidationErrors(errsStr, errs)
-}
-
-func RequestErrorsFormater(err error) string {
-	switch e := err.(type) {
-	case *url.Error:
-		if netErr, ok := e.Err.(net.Error); ok && netErr.Timeout() {
-			return "Timeout Error"
-		}
-		if strings.Contains(e.Error(), "http: ContentLength=") {
-			println(e.Error())
-			return "Empty Body Error"
-		}
-		// TODO: Add more cases
-	}
-	return "Unknown Error"
-}

go.mod

@@ -1,32 +1,18 @@
 module github.com/aykhans/dodo
 
-go 1.24
+go 1.25
 
 require (
-	github.com/go-playground/validator/v10 v10.25.0
-	github.com/jedib0t/go-pretty/v6 v6.6.6
-	github.com/valyala/fasthttp v1.59.0
-	golang.org/x/net v0.35.0
+	github.com/jedib0t/go-pretty/v6 v6.6.8
+	github.com/stretchr/testify v1.10.0
 )
 
 require (
-	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-)
-
-require (
-	github.com/andybalholm/brotli v1.1.1 // indirect
-	github.com/fatih/color v1.18.0
-	github.com/gabriel-vasile/mimetype v1.4.8 // indirect
-	github.com/go-playground/locales v0.14.1 // indirect
-	github.com/go-playground/universal-translator v0.18.1 // indirect
-	github.com/klauspost/compress v1.17.11 // indirect
-	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
-	github.com/valyala/bytebufferpool v1.0.0 // indirect
-	golang.org/x/crypto v0.33.0 // indirect
 	golang.org/x/sys v0.30.0 // indirect
-	golang.org/x/term v0.29.0 // indirect
 	golang.org/x/text v0.22.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,30 +1,7 @@
-github.com/andybalholm/brotli v1.1.1 h1:PR2pgnyFznKEugtsUo0xLdDop5SKXd5Qf5ysW+7XdTA=
-github.com/andybalholm/brotli v1.1.1/go.mod h1:05ib4cKhjx3OQYUY22hTVd34Bc8upXjOLL2rKwwZBoA=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/fatih/color v1.18.0 h1:S8gINlzdQ840/4pfAwic/ZE0djQEH3wM94VfqLTZcOM=
-github.com/fatih/color v1.18.0/go.mod h1:4FelSpRwEGDpQ12mAdzqdOukCy4u8WUtOY6lkT/6HfU=
-github.com/gabriel-vasile/mimetype v1.4.8 h1:FfZ3gj38NjllZIeJAmMhr+qKL8Wu+nOoI3GqacKw1NM=
-github.com/gabriel-vasile/mimetype v1.4.8/go.mod h1:ByKUIKGjh1ODkGM1asKUbQZOLGrPjydw3hYPU2YU9t8=
-github.com/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
-github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
-github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
-github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
-github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
-github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
-github.com/go-playground/validator/v10 v10.25.0 h1:5Dh7cjvzR7BRZadnsVOzPhWsrwUr0nmsZJxEAnFLNO8=
-github.com/go-playground/validator/v10 v10.25.0/go.mod h1:GGzBIJMuE98Ic/kJsBXbz1x/7cByt++cQ+YOuDM5wus=
-github.com/jedib0t/go-pretty/v6 v6.6.6 h1:LyezkL+1SuqH2z47e5IMQkYUIcs2BD+MnpdPRiRcN0c=
-github.com/jedib0t/go-pretty/v6 v6.6.6/go.mod h1:YwC5CE4fJ1HFUDeivSV1r//AmANFHyqczZk+U6BDALU=
-github.com/klauspost/compress v1.17.11 h1:In6xLpyWOi1+C7tXUUWv2ot1QvBjxevKAaI6IXrJmUc=
-github.com/klauspost/compress v1.17.11/go.mod h1:pMDklpSncoRMuLFrf1W9Ss9KT+0rH90U12bZKk7uwG0=
-github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
-github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
-github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
-github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
-github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
-github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
-github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/jedib0t/go-pretty/v6 v6.6.8 h1:JnnzQeRz2bACBobIaa/r+nqjvws4yEhcmaZ4n1QzsEc=
+github.com/jedib0t/go-pretty/v6 v6.6.8/go.mod h1:YwC5CE4fJ1HFUDeivSV1r//AmANFHyqczZk+U6BDALU=
 github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
 github.com/mattn/go-runewidth v0.0.16/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
@@ -34,23 +11,11 @@ github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
-github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
-github.com/valyala/fasthttp v1.59.0 h1:Qu0qYHfXvPk1mSLNqcFtEk6DpxgA26hy6bmydotDpRI=
-github.com/valyala/fasthttp v1.59.0/go.mod h1:GTxNb9Bc6r2a9D0TWNSPwDz78UxnTGBViY3xZNEqyYU=
-github.com/xyproto/randomstring v1.0.5 h1:YtlWPoRdgMu3NZtP45drfy1GKoojuR7hmRcnhZqKjWU=
-github.com/xyproto/randomstring v1.0.5/go.mod h1:rgmS5DeNXLivK7YprL0pY+lTuhNQW3iGxZ18UQApw/E=
-golang.org/x/crypto v0.33.0 h1:IOBPskki6Lysi0lo9qQvbxiQ+FvsCC/YWOecCHAixus=
-golang.org/x/crypto v0.33.0/go.mod h1:bVdXmD7IV/4GdElGPozy6U7lWdRXA4qyRVGJV57uQ5M=
-golang.org/x/net v0.35.0 h1:T5GQRQb2y08kTAByq9L4/bz8cipCdA8FbRTXewonqY8=
-golang.org/x/net v0.35.0/go.mod h1:EglIi67kWsHKlRzzVMUD93VMSWGFOMSZgxFjparz1Qk=
-golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
 golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/term v0.29.0 h1:L6pJp37ocefwRRtYPKSWOWzOtWSxVajvz2ldH/xi3iU=
-golang.org/x/term v0.29.0/go.mod h1:6bl4lRlvVuDgSf3179VpIxBF0o10JUpXWOnI7nErv7s=
 golang.org/x/text v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM=
 golang.org/x/text v0.22.0/go.mod h1:YRoo4H8PVmsu+E3Ou7cqLVH8oXWIHVoX0jqUWALQhfY=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -1,123 +0,0 @@
-package main
-
-import (
-	"context"
-	"fmt"
-	"net/url"
-	"os"
-	"os/signal"
-	"strings"
-	"syscall"
-	"time"
-
-	"github.com/aykhans/dodo/config"
-	customerrors "github.com/aykhans/dodo/custom_errors"
-	"github.com/aykhans/dodo/readers"
-	"github.com/aykhans/dodo/requests"
-	"github.com/aykhans/dodo/utils"
-	"github.com/aykhans/dodo/validation"
-	"github.com/fatih/color"
-	goValidator "github.com/go-playground/validator/v10"
-)
-
-func main() {
-	validator := validation.NewValidator()
-	conf := config.NewConfig("", 0, 0, 0, nil)
-	jsonConf := config.NewJSONConfig(
-		config.NewConfig("", 0, 0, 0, nil), nil, nil, nil, nil, nil,
-	)
-
-	cliConf, err := readers.CLIConfigReader()
-	if err != nil {
-		utils.PrintAndExit(err.Error())
-	}
-	if cliConf == nil {
-		os.Exit(0)
-	}
-
-	if err := validator.StructPartial(cliConf, "ConfigFile"); err != nil {
-		utils.PrintErrAndExit(
-			customerrors.ValidationErrorsFormater(
-				err.(goValidator.ValidationErrors),
-			),
-		)
-	}
-	if cliConf.ConfigFile != "" {
-		jsonConfNew, err := readers.JSONConfigReader(cliConf.ConfigFile)
-		if err != nil {
-			utils.PrintErrAndExit(err)
-		}
-		if err := validator.StructFiltered(
-			jsonConfNew,
-			func(ns []byte) bool {
-				return strings.LastIndex(string(ns), "Proxies") == -1
-			}); err != nil {
-			utils.PrintErrAndExit(
-				customerrors.ValidationErrorsFormater(
-					err.(goValidator.ValidationErrors),
-				),
-			)
-		}
-		jsonConf = jsonConfNew
-		conf.MergeConfigs(jsonConf.Config)
-	}
-
-	conf.MergeConfigs(cliConf.Config)
-	conf.SetDefaults()
-	if err := validator.Struct(conf); err != nil {
-		utils.PrintErrAndExit(
-			customerrors.ValidationErrorsFormater(
-				err.(goValidator.ValidationErrors),
-			),
-		)
-	}
-
-	parsedURL, err := url.Parse(conf.URL)
-	if err != nil {
-		utils.PrintErrAndExit(err)
-	}
-	requestConf := &config.RequestConfig{
-		Method:       conf.Method,
-		URL:          parsedURL,
-		Timeout:      time.Duration(conf.Timeout) * time.Millisecond,
-		DodosCount:   conf.DodosCount,
-		RequestCount: conf.RequestCount,
-		Params:       jsonConf.Params,
-		Headers:      jsonConf.Headers,
-		Cookies:      jsonConf.Cookies,
-		Proxies:      jsonConf.Proxies,
-		Body:         jsonConf.Body,
-		Yes:          cliConf.Yes.ValueOr(false),
-		NoProxyCheck: conf.NoProxyCheck.ValueOr(false),
-	}
-	requestConf.Print()
-	if !cliConf.Yes.ValueOr(false) {
-		response := readers.CLIYesOrNoReader("Do you want to continue?", true)
-		if !response {
-			utils.PrintAndExit("Exiting...")
-		}
-		fmt.Println()
-	}
-
-	ctx, cancel := context.WithCancel(context.Background())
-	sigChan := make(chan os.Signal, 1)
-	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
-	go func() {
-		<-sigChan
-		cancel()
-	}()
-
-	responses, err := requests.Run(ctx, requestConf)
-	if err != nil {
-		if customerrors.Is(err, customerrors.ErrInterrupt) {
-			color.Yellow(err.Error())
-			return
-		} else if customerrors.Is(err, customerrors.ErrNoInternet) {
-			utils.PrintAndExit("No internet connection")
-			return
-		}
-		utils.PrintErrAndExit(err)
-	}
-
-	responses.Print()
-}

pkg/config/cli.go

@@ -0,0 +1,300 @@
+package config
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/aykhans/dodo/pkg/types"
+	"github.com/aykhans/dodo/pkg/utils"
+)
+
+const cliUsageText = `Usage:
+  dodo [flags]
+
+Examples:
+
+Simple usage:
+  dodo -u https://example.com -o 1m
+
+Usage with config file:
+  dodo -f /path/to/config/file/config.json
+
+Usage with all flags:
+  dodo -f /path/to/config/file/config.json \
+    -u https://example.com -m POST \
+    -d 10 -r 1000 -o 3m -t 3s \
+    -b "body1" -body "body2" \
+    -H "header1:value1" -header "header2:value2" \
+    -p "param1=value1" -param "param2=value2" \
+    -c "cookie1=value1" -cookie "cookie2=value2" \
+    -x "http://proxy.example.com:8080" -proxy "socks5://proxy2.example.com:8080" \
+    -skip-verify -y
+
+Flags:
+  -h, -help                   help for dodo
+  -v, -version                version for dodo
+  -y, -yes          bool      Answer yes to all questions (default %v)
+  -f, -config-file  string    Path to the local config file or http(s) URL of the config file
+  -d, -dodos        uint      Number of dodos(threads) (default %d)
+  -r, -requests     uint      Number of total requests
+  -o, -duration     Time      Maximum duration for the test (e.g. 30s, 1m, 5h)
+  -t, -timeout      Time      Timeout for each request (e.g. 400ms, 15s, 1m10s) (default %v)
+  -u, -url          string    URL for stress testing
+  -m, -method       string    HTTP Method for the request (default %s)
+  -b, -body         [string]  Body for the request (e.g. "body text")
+  -p, -param        [string]  Parameter for the request (e.g. "key1=value1")
+  -H, -header       [string]  Header for the request (e.g. "key1: value1")
+  -c, -cookie       [string]  Cookie for the request (e.g. "key1=value1")
+  -x, -proxy        [string]  Proxy for the request (e.g. "http://proxy.example.com:8080")
+  -skip-verify      bool      Skip SSL/TLS certificate verification (default %v)`
+
+type ConfigCLIParser struct {
+	args []string
+}
+
+func NewConfigCLIParser(args []string) *ConfigCLIParser {
+	if args == nil {
+		args = []string{}
+	}
+	return &ConfigCLIParser{args: args}
+}
+
+type stringSliceArg []string
+
+func (arg *stringSliceArg) String() string {
+	return strings.Join(*arg, ",")
+}
+
+func (arg *stringSliceArg) Set(value string) error {
+	*arg = append(*arg, value)
+	return nil
+}
+
+// Parse parses command-line arguments into a Config object.
+// It can return the following errors:
+// - types.ErrCLINoArgs
+// - types.CLIUnexpectedArgsError
+// - types.FieldParseErrors
+func (parser *ConfigCLIParser) Parse() (*Config, error) {
+	flagSet := flag.NewFlagSet("dodo", flag.ExitOnError)
+
+	flagSet.Usage = func() { parser.PrintHelp() }
+
+	var (
+		config       = &Config{}
+		configFiles  = stringSliceArg{}
+		yes          bool
+		skipVerify   bool
+		method       string
+		urlInput     string
+		dodosCount   uint
+		requestCount uint
+		duration     time.Duration
+		timeout      time.Duration
+		params       = stringSliceArg{}
+		headers      = stringSliceArg{}
+		cookies      = stringSliceArg{}
+		bodies       = stringSliceArg{}
+		proxies      = stringSliceArg{}
+	)
+
+	{
+		flagSet.Var(&configFiles, "config-file", "Config file")
+		flagSet.Var(&configFiles, "f", "Config file")
+
+		flagSet.BoolVar(&yes, "yes", false, "Answer yes to all questions")
+		flagSet.BoolVar(&yes, "y", false, "Answer yes to all questions")
+
+		flagSet.BoolVar(&skipVerify, "skip-verify", false, "Skip SSL/TLS certificate verification")
+
+		flagSet.StringVar(&method, "method", "", "HTTP Method")
+		flagSet.StringVar(&method, "m", "", "HTTP Method")
+
+		flagSet.StringVar(&urlInput, "url", "", "URL to send the request")
+		flagSet.StringVar(&urlInput, "u", "", "URL to send the request")
+
+		flagSet.UintVar(&dodosCount, "dodos", 0, "Number of dodos(threads)")
+		flagSet.UintVar(&dodosCount, "d", 0, "Number of dodos(threads)")
+
+		flagSet.UintVar(&requestCount, "requests", 0, "Number of total requests")
+		flagSet.UintVar(&requestCount, "r", 0, "Number of total requests")
+
+		flagSet.DurationVar(&duration, "duration", 0, "Maximum duration of the test")
+		flagSet.DurationVar(&duration, "o", 0, "Maximum duration of the test")
+
+		flagSet.DurationVar(&timeout, "timeout", 0, "Timeout for each request (e.g. 400ms, 15s, 1m10s)")
+		flagSet.DurationVar(&timeout, "t", 0, "Timeout for each request (e.g. 400ms, 15s, 1m10s)")
+
+		flagSet.Var(&params, "param", "URL parameter to send with the request")
+		flagSet.Var(&params, "p", "URL parameter to send with the request")
+
+		flagSet.Var(&headers, "header", "Header to send with the request")
+		flagSet.Var(&headers, "H", "Header to send with the request")
+
+		flagSet.Var(&cookies, "cookie", "Cookie to send with the request")
+		flagSet.Var(&cookies, "c", "Cookie to send with the request")
+
+		flagSet.Var(&bodies, "body", "Body to send with the request")
+		flagSet.Var(&bodies, "b", "Body to send with the request")
+
+		flagSet.Var(&proxies, "proxy", "Proxy to use for the request")
+		flagSet.Var(&proxies, "x", "Proxy to use for the request")
+	}
+
+	// Parse the specific arguments provided to the parser, skipping the program name.
+	if err := flagSet.Parse(parser.args[1:]); err != nil {
+		panic(err)
+	}
+
+	// Check if no flags were set and no non-flag arguments were provided.
+	// This covers cases where `dodo` is run without any meaningful arguments.
+	if flagSet.NFlag() == 0 && len(flagSet.Args()) == 0 {
+		return nil, types.ErrCLINoArgs
+	}
+
+	// Check for any unexpected non-flag arguments remaining after parsing.
+	if args := flagSet.Args(); len(args) > 0 {
+		return nil, types.NewCLIUnexpectedArgsError(args)
+	}
+
+	var fieldParseErrors []types.FieldParseError
+	// Iterate over flags that were explicitly set on the command line.
+	flagSet.Visit(func(flagVar *flag.Flag) {
+		switch flagVar.Name {
+		case "config-file", "f":
+			for i, configFile := range configFiles {
+				configFileParsed, err := types.ParseConfigFile(configFile)
+
+				_ = utils.HandleErrorOrDie(err,
+					utils.OnSentinelError(types.ErrConfigFileExtensionNotFound, func(err error) error {
+						fieldParseErrors = append(
+							fieldParseErrors,
+							*types.NewFieldParseError(
+								fmt.Sprintf("config-file[%d]", i),
+								configFile,
+								errors.New("file extension not found"),
+							),
+						)
+						return nil
+					}),
+					utils.OnCustomError(func(err types.RemoteConfigFileParseError) error {
+						fieldParseErrors = append(
+							fieldParseErrors,
+							*types.NewFieldParseError(
+								fmt.Sprintf("config-file[%d]", i),
+								configFile,
+								fmt.Errorf("parse error: %w", err),
+							),
+						)
+						return nil
+					}),
+					utils.OnCustomError(func(err types.UnknownConfigFileTypeError) error {
+						fieldParseErrors = append(
+							fieldParseErrors,
+							*types.NewFieldParseError(
+								fmt.Sprintf("config-file[%d]", i),
+								configFile,
+								fmt.Errorf("file type '%s' not supported (supported types: %s)", err.Type, types.ConfigFileTypeYAML),
+							),
+						)
+						return nil
+					}),
+				)
+
+				if err == nil {
+					config.Files = append(config.Files, *configFileParsed)
+				}
+			}
+
+		case "yes", "y":
+			config.Yes = utils.ToPtr(yes)
+		case "skip-verify":
+			config.SkipVerify = utils.ToPtr(skipVerify)
+		case "method", "m":
+			config.Method = utils.ToPtr(method)
+		case "url", "u":
+			urlParsed, err := url.Parse(urlInput)
+			if err != nil {
+				fieldParseErrors = append(fieldParseErrors, *types.NewFieldParseError("url", urlInput, err))
+			} else {
+				config.URL = urlParsed
+			}
+		case "dodos", "d":
+			config.DodosCount = utils.ToPtr(dodosCount)
+		case "requests", "r":
+			config.RequestCount = utils.ToPtr(requestCount)
+		case "duration", "o":
+			config.Duration = utils.ToPtr(duration)
+		case "timeout", "t":
+			config.Timeout = utils.ToPtr(timeout)
+		case "param", "p":
+			config.Params.Parse(params...)
+		case "header", "H":
+			config.Headers.Parse(headers...)
+		case "cookie", "c":
+			config.Cookies.Parse(cookies...)
+		case "body", "b":
+			config.Bodies.Parse(bodies...)
+		case "proxy", "x":
+			for i, proxy := range proxies {
+				err := config.Proxies.Parse(proxy)
+				if err != nil {
+					fieldParseErrors = append(
+						fieldParseErrors,
+						*types.NewFieldParseError(fmt.Sprintf("proxy[%d]", i), proxy, err),
+					)
+				}
+			}
+		}
+	})
+
+	if len(fieldParseErrors) > 0 {
+		return nil, types.NewFieldParseErrors(fieldParseErrors)
+	}
+
+	return config, nil
+}
+
+func (parser *ConfigCLIParser) PrintHelp() {
+	fmt.Printf(
+		cliUsageText+"\n",
+		Defaults.Yes,
+		Defaults.DodosCount,
+		Defaults.RequestTimeout,
+		Defaults.Method,
+		Defaults.SkipVerify,
+	)
+}
+
+// CLIYesOrNoReader reads a yes or no answer from the command line.
+// It prompts the user with the given message and default value,
+// and returns true if the user answers "y" or "Y", and false otherwise.
+// If there is an error while reading the input, it returns false.
+// If the user simply presses enter without providing any input,
+// it returns the default value specified by the `def` parameter.
+func CLIYesOrNoReader(message string, def bool) bool {
+	var answer string
+	defaultMessage := "Y/n"
+
+	if !def {
+		defaultMessage = "y/N"
+	}
+
+	fmt.Printf("%s [%s]: ", message, defaultMessage)
+	if _, err := fmt.Scanln(&answer); err != nil {
+		if err.Error() == "unexpected newline" {
+			return def
+		}
+		return false
+	}
+
+	if answer == "" {
+		return def
+	}
+
+	return answer == "y" || answer == "Y"
+}

pkg/config/cli_test.go

@@ -0,0 +1,758 @@
+package config
+
+import (
+	"bytes"
+	"io"
+	"net/url"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/aykhans/dodo/pkg/types"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewConfigCLIParser(t *testing.T) {
+	t.Run("NewConfigCLIParser with valid args", func(t *testing.T) {
+		args := []string{"dodo", "-u", "https://example.com"}
+		parser := NewConfigCLIParser(args)
+
+		require.NotNil(t, parser)
+		assert.Equal(t, args, parser.args)
+	})
+
+	t.Run("NewConfigCLIParser with nil args", func(t *testing.T) {
+		parser := NewConfigCLIParser(nil)
+
+		require.NotNil(t, parser)
+		assert.Equal(t, []string{}, parser.args)
+	})
+
+	t.Run("NewConfigCLIParser with empty args", func(t *testing.T) {
+		args := []string{}
+		parser := NewConfigCLIParser(args)
+
+		require.NotNil(t, parser)
+		assert.Equal(t, args, parser.args)
+	})
+}
+
+func TestStringSliceArg(t *testing.T) {
+	t.Run("stringSliceArg String method", func(t *testing.T) {
+		arg := stringSliceArg{"value1", "value2", "value3"}
+		assert.Equal(t, "value1,value2,value3", arg.String())
+	})
+
+	t.Run("stringSliceArg String with empty slice", func(t *testing.T) {
+		arg := stringSliceArg{}
+		assert.Empty(t, arg.String())
+	})
+
+	t.Run("stringSliceArg String with single value", func(t *testing.T) {
+		arg := stringSliceArg{"single"}
+		assert.Equal(t, "single", arg.String())
+	})
+
+	t.Run("stringSliceArg Set method", func(t *testing.T) {
+		arg := &stringSliceArg{}
+
+		err := arg.Set("first")
+		require.NoError(t, err)
+		assert.Equal(t, stringSliceArg{"first"}, *arg)
+
+		err = arg.Set("second")
+		require.NoError(t, err)
+		assert.Equal(t, stringSliceArg{"first", "second"}, *arg)
+	})
+
+	t.Run("stringSliceArg Set with empty string", func(t *testing.T) {
+		arg := &stringSliceArg{}
+
+		err := arg.Set("")
+		require.NoError(t, err)
+		assert.Equal(t, stringSliceArg{""}, *arg)
+	})
+}
+
+func TestConfigCLIParser_Parse(t *testing.T) {
+	t.Run("Parse with no arguments returns ErrCLINoArgs", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo"})
+		config, err := parser.Parse()
+
+		assert.Nil(t, config)
+		require.ErrorIs(t, err, types.ErrCLINoArgs)
+	})
+
+	t.Run("Parse with unexpected arguments returns CLIUnexpectedArgsError", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "unexpected", "args"})
+		config, err := parser.Parse()
+
+		assert.Nil(t, config)
+		var cliErr types.CLIUnexpectedArgsError
+		require.ErrorAs(t, err, &cliErr)
+		assert.Equal(t, []string{"unexpected", "args"}, cliErr.Args)
+	})
+
+	t.Run("Parse with valid URL", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-u", "https://example.com"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.URL)
+		assert.Equal(t, "https://example.com", config.URL.String())
+	})
+
+	t.Run("Parse with invalid URL returns FieldParseErrors", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-u", "://invalid-url"})
+		config, err := parser.Parse()
+
+		assert.Nil(t, config)
+		var fieldErr types.FieldParseErrors
+		require.ErrorAs(t, err, &fieldErr)
+		assert.Len(t, fieldErr.Errors, 1)
+		assert.Equal(t, "url", fieldErr.Errors[0].Field)
+		assert.Equal(t, "://invalid-url", fieldErr.Errors[0].Value)
+	})
+
+	t.Run("Parse with method flag", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-m", "POST"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.Method)
+		assert.Equal(t, "POST", *config.Method)
+	})
+
+	t.Run("Parse with yes flag", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-y"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.Yes)
+		assert.True(t, *config.Yes)
+	})
+
+	t.Run("Parse with skip-verify flag", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-skip-verify"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.SkipVerify)
+		assert.True(t, *config.SkipVerify)
+	})
+
+	t.Run("Parse with dodos count", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-d", "5"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.DodosCount)
+		assert.Equal(t, uint(5), *config.DodosCount)
+	})
+
+	t.Run("Parse with request count", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-r", "1000"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.RequestCount)
+		assert.Equal(t, uint(1000), *config.RequestCount)
+	})
+
+	t.Run("Parse with duration", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-o", "5m"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.Duration)
+		assert.Equal(t, 5*time.Minute, *config.Duration)
+	})
+
+	t.Run("Parse with timeout", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-t", "30s"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.Timeout)
+		assert.Equal(t, 30*time.Second, *config.Timeout)
+	})
+
+	t.Run("Parse with parameters", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-p", "key1=value1", "-p", "key2=value2"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		assert.Len(t, config.Params, 2)
+		assert.Equal(t, "key1", config.Params[0].Key)
+		assert.Equal(t, []string{"value1"}, config.Params[0].Value)
+		assert.Equal(t, "key2", config.Params[1].Key)
+		assert.Equal(t, []string{"value2"}, config.Params[1].Value)
+	})
+
+	t.Run("Parse with headers", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-H", "Content-Type: application/json", "-H", "Authorization: Bearer token"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		assert.Len(t, config.Headers, 2)
+		assert.Equal(t, "Content-Type", config.Headers[0].Key)
+		assert.Equal(t, []string{"application/json"}, config.Headers[0].Value)
+		assert.Equal(t, "Authorization", config.Headers[1].Key)
+		assert.Equal(t, []string{"Bearer token"}, config.Headers[1].Value)
+	})
+
+	t.Run("Parse with cookies", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-c", "session=abc123", "-c", "user=john"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		assert.Len(t, config.Cookies, 2)
+		assert.Equal(t, "session", config.Cookies[0].Key)
+		assert.Equal(t, []string{"abc123"}, config.Cookies[0].Value)
+		assert.Equal(t, "user", config.Cookies[1].Key)
+		assert.Equal(t, []string{"john"}, config.Cookies[1].Value)
+	})
+
+	t.Run("Parse with bodies", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-b", "body1", "-b", "body2"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		assert.Len(t, config.Bodies, 2)
+		assert.Equal(t, types.Body("body1"), config.Bodies[0])
+		assert.Equal(t, types.Body("body2"), config.Bodies[1])
+	})
+
+	t.Run("Parse with valid proxies", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-x", "http://proxy1.example.com:8080", "-x", "socks5://proxy2.example.com:1080"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		assert.Len(t, config.Proxies, 2)
+		assert.Equal(t, "http://proxy1.example.com:8080", config.Proxies[0].String())
+		assert.Equal(t, "socks5://proxy2.example.com:1080", config.Proxies[1].String())
+	})
+
+	t.Run("Parse with invalid proxy returns FieldParseErrors", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-x", "://invalid-proxy"})
+		config, err := parser.Parse()
+
+		assert.Nil(t, config)
+		var fieldErr types.FieldParseErrors
+		require.ErrorAs(t, err, &fieldErr)
+		assert.Len(t, fieldErr.Errors, 1)
+		assert.Equal(t, "proxy[0]", fieldErr.Errors[0].Field)
+		assert.Equal(t, "://invalid-proxy", fieldErr.Errors[0].Value)
+	})
+
+	t.Run("Parse with mixed valid and invalid proxies", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-x", "http://valid.example.com:8080", "-x", "://invalid"})
+		config, err := parser.Parse()
+
+		assert.Nil(t, config)
+		var fieldErr types.FieldParseErrors
+		require.ErrorAs(t, err, &fieldErr)
+		assert.Len(t, fieldErr.Errors, 1)
+		assert.Equal(t, "proxy[1]", fieldErr.Errors[0].Field)
+		assert.Equal(t, "://invalid", fieldErr.Errors[0].Value)
+	})
+
+	t.Run("Parse with long flag names", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{
+			"dodo",
+			"--url", "https://example.com",
+			"--method", "POST",
+			"--yes",
+			"--skip-verify",
+			"--dodos", "3",
+			"--requests", "500",
+			"--duration", "1m",
+			"--timeout", "10s",
+		})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+
+		assert.Equal(t, "https://example.com", config.URL.String())
+		assert.Equal(t, "POST", *config.Method)
+		assert.True(t, *config.Yes)
+		assert.True(t, *config.SkipVerify)
+		assert.Equal(t, uint(3), *config.DodosCount)
+		assert.Equal(t, uint(500), *config.RequestCount)
+		assert.Equal(t, time.Minute, *config.Duration)
+		assert.Equal(t, 10*time.Second, *config.Timeout)
+	})
+
+	t.Run("Parse with config-file flag valid YAML", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-f", "/path/to/config.yaml"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		assert.Len(t, config.Files, 1)
+	})
+
+	t.Run("Parse with config-file flag using long form", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "--config-file", "/path/to/config.yml"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		assert.Len(t, config.Files, 1)
+	})
+
+	t.Run("Parse with config-file flag invalid extension", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-f", "/path/to/config"})
+		config, err := parser.Parse()
+
+		assert.Nil(t, config)
+		var fieldErr types.FieldParseErrors
+		require.ErrorAs(t, err, &fieldErr)
+		assert.Len(t, fieldErr.Errors, 1)
+		assert.Equal(t, "config-file[0]", fieldErr.Errors[0].Field)
+		assert.Equal(t, "/path/to/config", fieldErr.Errors[0].Value)
+		assert.Contains(t, fieldErr.Errors[0].Err.Error(), "file extension not found")
+	})
+
+	t.Run("Parse with config-file flag unsupported file type", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-f", "/path/to/config.json"})
+		config, err := parser.Parse()
+
+		assert.Nil(t, config)
+		var fieldErr types.FieldParseErrors
+		require.ErrorAs(t, err, &fieldErr)
+		assert.Len(t, fieldErr.Errors, 1)
+		assert.Equal(t, "config-file[0]", fieldErr.Errors[0].Field)
+		assert.Equal(t, "/path/to/config.json", fieldErr.Errors[0].Value)
+		assert.Contains(t, fieldErr.Errors[0].Err.Error(), "file type")
+		assert.Contains(t, fieldErr.Errors[0].Err.Error(), "not supported")
+	})
+
+	t.Run("Parse with config-file flag remote URL", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-f", "https://example.com/config.yaml"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		assert.Len(t, config.Files, 1)
+	})
+
+	t.Run("Parse with multiple config files", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-f", "/path/config1.yaml", "-f", "/path/config2.yml"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		assert.Len(t, config.Files, 2)
+	})
+
+	t.Run("Parse with all flags combined", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{
+			"dodo",
+			"-u", "https://api.example.com/test",
+			"-m", "PUT",
+			"-y",
+			"-skip-verify",
+			"-d", "10",
+			"-r", "2000",
+			"-o", "30m",
+			"-t", "5s",
+			"-p", "apikey=123",
+			"-H", "Content-Type: application/json",
+			"-c", "session=token123",
+			"-b", `{"data": "test"}`,
+			"-x", "http://proxy.example.com:3128",
+			"-f", "/path/to/config.yaml",
+		})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+
+		// Verify all fields are set correctly
+		assert.Equal(t, "https://api.example.com/test", config.URL.String())
+		assert.Equal(t, "PUT", *config.Method)
+		assert.True(t, *config.Yes)
+		assert.True(t, *config.SkipVerify)
+		assert.Equal(t, uint(10), *config.DodosCount)
+		assert.Equal(t, uint(2000), *config.RequestCount)
+		assert.Equal(t, 30*time.Minute, *config.Duration)
+		assert.Equal(t, 5*time.Second, *config.Timeout)
+
+		assert.Len(t, config.Params, 1)
+		assert.Equal(t, "apikey", config.Params[0].Key)
+
+		assert.Len(t, config.Headers, 1)
+		assert.Equal(t, "Content-Type", config.Headers[0].Key)
+
+		assert.Len(t, config.Cookies, 1)
+		assert.Equal(t, "session", config.Cookies[0].Key)
+
+		assert.Len(t, config.Bodies, 1)
+		assert.Equal(t, types.Body(`{"data": "test"}`), config.Bodies[0]) //nolint:testifylint
+
+		assert.Len(t, config.Proxies, 1)
+		assert.Equal(t, "http://proxy.example.com:3128", config.Proxies[0].String())
+
+		assert.Len(t, config.Files, 1)
+	})
+
+	t.Run("Parse with multiple field parse errors", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{
+			"dodo",
+			"-u", "://invalid-url",
+			"-x", "://invalid-proxy1",
+			"-x", "://invalid-proxy2",
+		})
+		config, err := parser.Parse()
+
+		assert.Nil(t, config)
+		var fieldErr types.FieldParseErrors
+		require.ErrorAs(t, err, &fieldErr)
+		assert.Len(t, fieldErr.Errors, 3)
+
+		// Check error fields
+		fields := make(map[string]bool)
+		for _, parseErr := range fieldErr.Errors {
+			fields[parseErr.Field] = true
+		}
+		assert.True(t, fields["url"])
+		assert.True(t, fields["proxy[0]"])
+		assert.True(t, fields["proxy[1]"])
+
+		// Check error values
+		values := make(map[string]string)
+		for _, parseErr := range fieldErr.Errors {
+			values[parseErr.Field] = parseErr.Value
+		}
+		assert.Equal(t, "://invalid-url", values["url"])
+		assert.Equal(t, "://invalid-proxy1", values["proxy[0]"])
+		assert.Equal(t, "://invalid-proxy2", values["proxy[1]"])
+	})
+}
+
+func TestConfigCLIParser_PrintHelp(t *testing.T) {
+	t.Run("PrintHelp outputs expected content", func(t *testing.T) {
+		// Capture stdout
+		oldStdout := os.Stdout
+		reader, writer, _ := os.Pipe()
+		os.Stdout = writer
+
+		parser := NewConfigCLIParser([]string{"dodo"})
+		parser.PrintHelp()
+
+		// Restore stdout and read output
+		writer.Close()
+		os.Stdout = oldStdout
+		var buf bytes.Buffer
+		io.Copy(&buf, reader)
+		output := buf.String()
+
+		// Verify help text contains expected elements
+		assert.Contains(t, output, "Usage:")
+		assert.Contains(t, output, "dodo [flags]")
+		assert.Contains(t, output, "Examples:")
+		assert.Contains(t, output, "Flags:")
+		assert.Contains(t, output, "-h, -help")
+		assert.Contains(t, output, "-v, -version")
+		assert.Contains(t, output, "-u, -url")
+		assert.Contains(t, output, "-m, -method")
+		assert.Contains(t, output, "-d, -dodos")
+		assert.Contains(t, output, "-r, -requests")
+		assert.Contains(t, output, "-t, -timeout")
+		assert.Contains(t, output, "-b, -body")
+		assert.Contains(t, output, "-H, -header")
+		assert.Contains(t, output, "-p, -param")
+		assert.Contains(t, output, "-c, -cookie")
+		assert.Contains(t, output, "-x, -proxy")
+		assert.Contains(t, output, "-skip-verify")
+		assert.Contains(t, output, "-y, -yes")
+		assert.Contains(t, output, "-f, -config-file")
+
+		// Verify default values are included
+		assert.Contains(t, output, Defaults.Method)
+		assert.Contains(t, output, "1")     // DodosCount default
+		assert.Contains(t, output, "10s")   // RequestTimeout default
+		assert.Contains(t, output, "false") // Yes default
+		assert.Contains(t, output, "false") // SkipVerify default
+	})
+}
+
+func TestCLIYesOrNoReader(t *testing.T) {
+	t.Run("CLIYesOrNoReader with 'y' input returns true", func(t *testing.T) {
+		// Redirect stdin
+		oldStdin := os.Stdin
+		reader, writer, _ := os.Pipe()
+		os.Stdin = reader
+
+		// Write input and close writer
+		writer.WriteString("y\n")
+		writer.Close()
+
+		result := CLIYesOrNoReader("Test question", false)
+
+		// Restore stdin
+		os.Stdin = oldStdin
+
+		assert.True(t, result)
+	})
+
+	t.Run("CLIYesOrNoReader with 'Y' input returns true", func(t *testing.T) {
+		// Redirect stdin
+		oldStdin := os.Stdin
+		reader, writer, _ := os.Pipe()
+		os.Stdin = reader
+
+		// Write input and close writer
+		writer.WriteString("Y\n")
+		writer.Close()
+
+		result := CLIYesOrNoReader("Test question", false)
+
+		// Restore stdin
+		os.Stdin = oldStdin
+
+		assert.True(t, result)
+	})
+
+	t.Run("CLIYesOrNoReader with 'n' input returns false", func(t *testing.T) {
+		// Redirect stdin
+		oldStdin := os.Stdin
+		reader, writer, _ := os.Pipe()
+		os.Stdin = reader
+
+		// Write input and close writer
+		writer.WriteString("n\n")
+		writer.Close()
+
+		result := CLIYesOrNoReader("Test question", true)
+
+		// Restore stdin
+		os.Stdin = oldStdin
+
+		assert.False(t, result)
+	})
+
+	t.Run("CLIYesOrNoReader with empty input returns default", func(t *testing.T) {
+		// Redirect stdin
+		oldStdin := os.Stdin
+		reader, writer, _ := os.Pipe()
+		os.Stdin = reader
+
+		// Write just newline and close writer
+		writer.WriteString("\n")
+		writer.Close()
+
+		// Test with default true
+		result := CLIYesOrNoReader("Test question", true)
+		os.Stdin = oldStdin
+		assert.True(t, result)
+	})
+
+	t.Run("CLIYesOrNoReader with empty input returns default false", func(t *testing.T) {
+		// Redirect stdin
+		oldStdin := os.Stdin
+		reader, writer, _ := os.Pipe()
+		os.Stdin = reader
+
+		// Write just newline and close writer
+		writer.WriteString("\n")
+		writer.Close()
+
+		// Test with default false
+		result := CLIYesOrNoReader("Test question", false)
+		os.Stdin = oldStdin
+		assert.False(t, result)
+	})
+
+	t.Run("CLIYesOrNoReader with other input returns false", func(t *testing.T) {
+		// Redirect stdin
+		oldStdin := os.Stdin
+		reader, writer, _ := os.Pipe()
+		os.Stdin = reader
+
+		// Write other input and close writer
+		writer.WriteString("maybe\n")
+		writer.Close()
+
+		result := CLIYesOrNoReader("Test question", true)
+
+		// Restore stdin
+		os.Stdin = oldStdin
+
+		assert.False(t, result)
+	})
+
+	t.Run("CLIYesOrNoReader message format with default true", func(t *testing.T) {
+		// Capture stdout to verify message format
+		oldStdout := os.Stdout
+		stdoutReader, stdoutWriter, _ := os.Pipe()
+		os.Stdout = stdoutWriter
+
+		// Redirect stdin
+		oldStdin := os.Stdin
+		stdinReader, stdinWriter, _ := os.Pipe()
+		os.Stdin = stdinReader
+
+		// Write input and close writer
+		stdinWriter.WriteString("y\n")
+		stdinWriter.Close()
+
+		CLIYesOrNoReader("Continue?", true)
+
+		// Restore stdin and stdout
+		os.Stdin = oldStdin
+		stdoutWriter.Close()
+		os.Stdout = oldStdout
+
+		// Read output
+		var buf bytes.Buffer
+		io.Copy(&buf, stdoutReader)
+		output := buf.String()
+
+		assert.Contains(t, output, "Continue? [Y/n]:")
+	})
+
+	t.Run("CLIYesOrNoReader message format with default false", func(t *testing.T) {
+		// Capture stdout to verify message format
+		oldStdout := os.Stdout
+		stdoutReader, stdoutWriter, _ := os.Pipe()
+		os.Stdout = stdoutWriter
+
+		// Redirect stdin
+		oldStdin := os.Stdin
+		stdinReader, stdinWriter, _ := os.Pipe()
+		os.Stdin = stdinReader
+
+		// Write input and close writer
+		stdinWriter.WriteString("n\n")
+		stdinWriter.Close()
+
+		CLIYesOrNoReader("Delete files?", false)
+
+		// Restore stdin and stdout
+		os.Stdin = oldStdin
+		stdoutWriter.Close()
+		os.Stdout = oldStdout
+
+		// Read output
+		var buf bytes.Buffer
+		io.Copy(&buf, stdoutReader)
+		output := buf.String()
+
+		assert.Contains(t, output, "Delete files? [y/N]:")
+	})
+}
+
+func TestConfigCLIParser_EdgeCases(t *testing.T) {
+	t.Run("Parse with zero duration", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-o", "0s"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.Duration)
+		assert.Equal(t, time.Duration(0), *config.Duration)
+	})
+
+	t.Run("Parse with zero timeout", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-t", "0s"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.Timeout)
+		assert.Equal(t, time.Duration(0), *config.Timeout)
+	})
+
+	t.Run("Parse with zero dodos count", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-d", "0"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.DodosCount)
+		assert.Equal(t, uint(0), *config.DodosCount)
+	})
+
+	t.Run("Parse with zero request count", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{"dodo", "-r", "0"})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.RequestCount)
+		assert.Equal(t, uint(0), *config.RequestCount)
+	})
+
+	t.Run("Parse with empty string values", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{
+			"dodo",
+			"-m", "",
+			"-p", "",
+			"-H", "",
+			"-c", "",
+			"-b", "",
+		})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+
+		assert.Empty(t, *config.Method)
+		assert.Len(t, config.Params, 1)
+		assert.Empty(t, config.Params[0].Key)
+		assert.Len(t, config.Headers, 1)
+		assert.Empty(t, config.Headers[0].Key)
+		assert.Len(t, config.Cookies, 1)
+		assert.Empty(t, config.Cookies[0].Key)
+		assert.Len(t, config.Bodies, 1)
+		assert.Equal(t, types.Body(""), config.Bodies[0])
+	})
+
+	t.Run("Parse with complex URL", func(t *testing.T) {
+		complexURL := "https://user:pass@api.example.com:8080/v1/endpoint?param=value&other=test#fragment"
+		parser := NewConfigCLIParser([]string{"dodo", "-u", complexURL})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+		require.NotNil(t, config.URL)
+
+		parsedURL, parseErr := url.Parse(complexURL)
+		require.NoError(t, parseErr)
+		assert.Equal(t, parsedURL, config.URL)
+	})
+
+	t.Run("Parse with repeated same flags overrides previous values", func(t *testing.T) {
+		parser := NewConfigCLIParser([]string{
+			"dodo",
+			"-m", "GET",
+			"-m", "POST", // This should override the previous
+			"-d", "1",
+			"-d", "5", // This should override the previous
+		})
+		config, err := parser.Parse()
+
+		require.NoError(t, err)
+		require.NotNil(t, config)
+
+		assert.Equal(t, "POST", *config.Method)
+		assert.Equal(t, uint(5), *config.DodosCount)
+	})
+}

pkg/config/config.go

@@ -0,0 +1,114 @@
+package config
+
+import (
+	"net/url"
+	"time"
+
+	"github.com/aykhans/dodo/pkg/types"
+	"github.com/aykhans/dodo/pkg/utils"
+)
+
+const VERSION string = "1.0.0"
+
+var Defaults = struct {
+	UserAgent      string
+	Method         string
+	RequestTimeout time.Duration
+	DodosCount     uint
+	Yes            bool
+	SkipVerify     bool
+}{
+	UserAgent:      "dodo/" + VERSION,
+	Method:         "GET",
+	RequestTimeout: time.Second * 10,
+	DodosCount:     1,
+	Yes:            false,
+	SkipVerify:     false,
+}
+
+var SupportedProxySchemes []string = []string{"http", "socks5", "socks5h"}
+
+type Config struct {
+	Files        []types.ConfigFile
+	Method       *string
+	URL          *url.URL
+	Timeout      *time.Duration
+	DodosCount   *uint
+	RequestCount *uint
+	Duration     *time.Duration
+	Yes          *bool
+	SkipVerify   *bool
+	Params       types.Params
+	Headers      types.Headers
+	Cookies      types.Cookies
+	Bodies       types.Bodies
+	Proxies      types.Proxies
+}
+
+func NewConfig() *Config {
+	return &Config{}
+}
+
+func (config *Config) MergeConfig(newConfig *Config) {
+	config.Files = append(config.Files, newConfig.Files...)
+	if newConfig.Method != nil {
+		config.Method = newConfig.Method
+	}
+	if newConfig.URL != nil {
+		config.URL = newConfig.URL
+	}
+	if newConfig.Timeout != nil {
+		config.Timeout = newConfig.Timeout
+	}
+	if newConfig.DodosCount != nil {
+		config.DodosCount = newConfig.DodosCount
+	}
+	if newConfig.RequestCount != nil {
+		config.RequestCount = newConfig.RequestCount
+	}
+	if newConfig.Duration != nil {
+		config.Duration = newConfig.Duration
+	}
+	if newConfig.Yes != nil {
+		config.Yes = newConfig.Yes
+	}
+	if newConfig.SkipVerify != nil {
+		config.SkipVerify = newConfig.SkipVerify
+	}
+	if len(newConfig.Params) != 0 {
+		config.Params = newConfig.Params
+	}
+	if len(newConfig.Headers) != 0 {
+		config.Headers = newConfig.Headers
+	}
+	if len(newConfig.Cookies) != 0 {
+		config.Cookies = newConfig.Cookies
+	}
+	if len(newConfig.Bodies) != 0 {
+		config.Bodies = newConfig.Bodies
+	}
+	if len(newConfig.Proxies) != 0 {
+		config.Proxies = newConfig.Proxies
+	}
+}
+
+func (config *Config) SetDefaults() {
+	if config.Method == nil {
+		config.Method = utils.ToPtr(Defaults.Method)
+	}
+	if config.Timeout == nil {
+		config.Timeout = &Defaults.RequestTimeout
+	}
+	if config.DodosCount == nil {
+		config.DodosCount = utils.ToPtr(Defaults.DodosCount)
+	}
+	if config.Yes == nil {
+		config.Yes = utils.ToPtr(Defaults.Yes)
+	}
+	if config.SkipVerify == nil {
+		config.SkipVerify = utils.ToPtr(Defaults.SkipVerify)
+	}
+	if !config.Headers.Has("User-Agent") {
+		config.Headers = append(config.Headers, types.Header{Key: "User-Agent", Value: []string{Defaults.UserAgent}})
+	}
+}

pkg/config/config_test.go

@@ -0,0 +1,354 @@
+package config
+
+import (
+	"net/url"
+	"testing"
+	"time"
+
+	"github.com/aykhans/dodo/pkg/types"
+	"github.com/aykhans/dodo/pkg/utils"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMergeConfig(t *testing.T) {
+	t.Run("MergeConfig with all fields from new config", func(t *testing.T) {
+		originalURL, _ := url.Parse("https://original.example.com")
+		newURL, _ := url.Parse("https://new.example.com")
+
+		originalTimeout := 5 * time.Second
+		newTimeout := 10 * time.Second
+
+		originalDuration := 1 * time.Minute
+		newDuration := 2 * time.Minute
+
+		config := &Config{
+			Files:        []types.ConfigFile{},
+			Method:       utils.ToPtr("GET"),
+			URL:          originalURL,
+			Timeout:      &originalTimeout,
+			DodosCount:   utils.ToPtr(uint(1)),
+			RequestCount: utils.ToPtr(uint(10)),
+			Duration:     &originalDuration,
+			Yes:          utils.ToPtr(false),
+			SkipVerify:   utils.ToPtr(false),
+			Params:       types.Params{{Key: "old", Value: []string{"value"}}},
+			Headers:      types.Headers{{Key: "Old-Header", Value: []string{"old"}}},
+			Cookies:      types.Cookies{{Key: "oldCookie", Value: []string{"oldValue"}}},
+			Bodies:       types.Bodies{types.Body("old body")},
+			Proxies:      types.Proxies{},
+		}
+
+		newConfig := &Config{
+			Files:        []types.ConfigFile{},
+			Method:       utils.ToPtr("POST"),
+			URL:          newURL,
+			Timeout:      &newTimeout,
+			DodosCount:   utils.ToPtr(uint(5)),
+			RequestCount: utils.ToPtr(uint(20)),
+			Duration:     &newDuration,
+			Yes:          utils.ToPtr(true),
+			SkipVerify:   utils.ToPtr(true),
+			Params:       types.Params{{Key: "new", Value: []string{"value"}}},
+			Headers:      types.Headers{{Key: "New-Header", Value: []string{"new"}}},
+			Cookies:      types.Cookies{{Key: "newCookie", Value: []string{"newValue"}}},
+			Bodies:       types.Bodies{types.Body("new body")},
+			Proxies:      types.Proxies{},
+		}
+
+		config.MergeConfig(newConfig)
+
+		assert.Equal(t, "POST", *config.Method)
+		assert.Equal(t, newURL, config.URL)
+		assert.Equal(t, newTimeout, *config.Timeout)
+		assert.Equal(t, uint(5), *config.DodosCount)
+		assert.Equal(t, uint(20), *config.RequestCount)
+		assert.Equal(t, newDuration, *config.Duration)
+		assert.True(t, *config.Yes)
+		assert.True(t, *config.SkipVerify)
+		assert.Equal(t, types.Params{{Key: "new", Value: []string{"value"}}}, config.Params)
+		assert.Equal(t, types.Headers{{Key: "New-Header", Value: []string{"new"}}}, config.Headers)
+		assert.Equal(t, types.Cookies{{Key: "newCookie", Value: []string{"newValue"}}}, config.Cookies)
+		assert.Equal(t, types.Bodies{types.Body("new body")}, config.Bodies)
+		assert.Empty(t, config.Proxies)
+	})
+
+	t.Run("MergeConfig with partial fields from new config", func(t *testing.T) {
+		originalURL, _ := url.Parse("https://original.example.com")
+		originalTimeout := 5 * time.Second
+
+		config := &Config{
+			Files:      []types.ConfigFile{},
+			Method:     utils.ToPtr("GET"),
+			URL:        originalURL,
+			Timeout:    &originalTimeout,
+			DodosCount: utils.ToPtr(uint(1)),
+			Headers:    types.Headers{{Key: "Original-Header", Value: []string{"original"}}},
+		}
+
+		newURL, _ := url.Parse("https://new.example.com")
+		newConfig := &Config{
+			Files:      []types.ConfigFile{},
+			URL:        newURL,
+			DodosCount: utils.ToPtr(uint(10)),
+		}
+
+		config.MergeConfig(newConfig)
+
+		assert.Equal(t, "GET", *config.Method, "Method should remain unchanged")
+		assert.Equal(t, newURL, config.URL, "URL should be updated")
+		assert.Equal(t, originalTimeout, *config.Timeout, "Timeout should remain unchanged")
+		assert.Equal(t, uint(10), *config.DodosCount, "DodosCount should be updated")
+		assert.Equal(t, types.Headers{{Key: "Original-Header", Value: []string{"original"}}}, config.Headers, "Headers should remain unchanged")
+	})
+
+	t.Run("MergeConfig with nil new config fields", func(t *testing.T) {
+		originalURL, _ := url.Parse("https://original.example.com")
+		originalTimeout := 5 * time.Second
+
+		config := &Config{
+			Files:      []types.ConfigFile{},
+			Method:     utils.ToPtr("GET"),
+			URL:        originalURL,
+			Timeout:    &originalTimeout,
+			DodosCount: utils.ToPtr(uint(1)),
+			Yes:        utils.ToPtr(false),
+			SkipVerify: utils.ToPtr(false),
+		}
+
+		newConfig := &Config{
+			Files:      []types.ConfigFile{},
+			Method:     nil,
+			URL:        nil,
+			Timeout:    nil,
+			DodosCount: nil,
+			Yes:        nil,
+			SkipVerify: nil,
+		}
+
+		originalConfigCopy := *config
+		config.MergeConfig(newConfig)
+
+		assert.Equal(t, originalConfigCopy.Method, config.Method)
+		assert.Equal(t, originalConfigCopy.URL, config.URL)
+		assert.Equal(t, originalConfigCopy.Timeout, config.Timeout)
+		assert.Equal(t, originalConfigCopy.DodosCount, config.DodosCount)
+		assert.Equal(t, originalConfigCopy.Yes, config.Yes)
+		assert.Equal(t, originalConfigCopy.SkipVerify, config.SkipVerify)
+	})
+
+	t.Run("MergeConfig with empty slices", func(t *testing.T) {
+		configFile, _ := types.ParseConfigFile("original.yml")
+		config := &Config{
+			Files:   []types.ConfigFile{*configFile},
+			Params:  types.Params{{Key: "original", Value: []string{"value"}}},
+			Headers: types.Headers{{Key: "Original-Header", Value: []string{"original"}}},
+			Cookies: types.Cookies{{Key: "originalCookie", Value: []string{"originalValue"}}},
+			Bodies:  types.Bodies{types.Body("original body")},
+			Proxies: types.Proxies{},
+		}
+
+		newConfig := &Config{
+			Files:   []types.ConfigFile{},
+			Params:  types.Params{},
+			Headers: types.Headers{},
+			Cookies: types.Cookies{},
+			Bodies:  types.Bodies{},
+			Proxies: types.Proxies{},
+		}
+
+		config.MergeConfig(newConfig)
+
+		assert.Equal(t, []types.ConfigFile{*configFile}, config.Files, "Empty Files should not override")
+		assert.Equal(t, types.Params{{Key: "original", Value: []string{"value"}}}, config.Params, "Empty Params should not override")
+		assert.Equal(t, types.Headers{{Key: "Original-Header", Value: []string{"original"}}}, config.Headers, "Empty Headers should not override")
+		assert.Equal(t, types.Cookies{{Key: "originalCookie", Value: []string{"originalValue"}}}, config.Cookies, "Empty Cookies should not override")
+		assert.Equal(t, types.Bodies{types.Body("original body")}, config.Bodies, "Empty Bodies should not override")
+		assert.Equal(t, types.Proxies{}, config.Proxies, "Empty Proxies should not override")
+	})
+
+	t.Run("MergeConfig with Files field", func(t *testing.T) {
+		configFile1, _ := types.ParseConfigFile("config1.yml")
+		configFile2, _ := types.ParseConfigFile("config2.yaml")
+
+		config := &Config{
+			Files:   []types.ConfigFile{*configFile1},
+			Method:  utils.ToPtr("GET"),
+			Headers: types.Headers{{Key: "Original-Header", Value: []string{"original"}}},
+		}
+
+		newConfig := &Config{
+			Files:  []types.ConfigFile{*configFile2},
+			Method: utils.ToPtr("POST"),
+		}
+
+		config.MergeConfig(newConfig)
+
+		assert.Equal(t, "POST", *config.Method, "Method should be updated")
+		assert.Equal(t, []types.ConfigFile{*configFile1, *configFile2}, config.Files, "Files should be appended")
+		assert.Equal(t, types.Headers{{Key: "Original-Header", Value: []string{"original"}}}, config.Headers, "Headers should remain unchanged")
+	})
+
+	t.Run("MergeConfig on empty original config", func(t *testing.T) {
+		config := &Config{}
+
+		newURL, _ := url.Parse("https://new.example.com")
+		newTimeout := 10 * time.Second
+		newDuration := 2 * time.Minute
+
+		newConfig := &Config{
+			Files:        []types.ConfigFile{},
+			Method:       utils.ToPtr("POST"),
+			URL:          newURL,
+			Timeout:      &newTimeout,
+			DodosCount:   utils.ToPtr(uint(5)),
+			RequestCount: utils.ToPtr(uint(20)),
+			Duration:     &newDuration,
+			Yes:          utils.ToPtr(true),
+			SkipVerify:   utils.ToPtr(true),
+			Params:       types.Params{{Key: "new", Value: []string{"value"}}},
+			Headers:      types.Headers{{Key: "New-Header", Value: []string{"new"}}},
+			Cookies:      types.Cookies{{Key: "newCookie", Value: []string{"newValue"}}},
+			Bodies:       types.Bodies{types.Body("new body")},
+			Proxies:      types.Proxies{},
+		}
+
+		config.MergeConfig(newConfig)
+
+		assert.Equal(t, "POST", *config.Method)
+		assert.Equal(t, newURL, config.URL)
+		assert.Equal(t, newTimeout, *config.Timeout)
+		assert.Equal(t, uint(5), *config.DodosCount)
+		assert.Equal(t, uint(20), *config.RequestCount)
+		assert.Equal(t, newDuration, *config.Duration)
+		assert.True(t, *config.Yes)
+		assert.True(t, *config.SkipVerify)
+		assert.Equal(t, types.Params{{Key: "new", Value: []string{"value"}}}, config.Params)
+		assert.Equal(t, types.Headers{{Key: "New-Header", Value: []string{"new"}}}, config.Headers)
+		assert.Equal(t, types.Cookies{{Key: "newCookie", Value: []string{"newValue"}}}, config.Cookies)
+		assert.Equal(t, types.Bodies{types.Body("new body")}, config.Bodies)
+		assert.Empty(t, config.Proxies)
+	})
+}
+
+func TestSetDefaults(t *testing.T) {
+	t.Run("SetDefaults on empty config", func(t *testing.T) {
+		config := &Config{}
+		config.SetDefaults()
+
+		require.NotNil(t, config.Method)
+		assert.Equal(t, Defaults.Method, *config.Method)
+
+		require.NotNil(t, config.Timeout)
+		assert.Equal(t, Defaults.RequestTimeout, *config.Timeout)
+
+		require.NotNil(t, config.DodosCount)
+		assert.Equal(t, Defaults.DodosCount, *config.DodosCount)
+
+		require.NotNil(t, config.Yes)
+		assert.Equal(t, Defaults.Yes, *config.Yes)
+
+		require.NotNil(t, config.SkipVerify)
+		assert.Equal(t, Defaults.SkipVerify, *config.SkipVerify)
+
+		assert.True(t, config.Headers.Has("User-Agent"))
+		assert.Equal(t, Defaults.UserAgent, config.Headers[0].Value[0])
+	})
+
+	t.Run("SetDefaults preserves existing values", func(t *testing.T) {
+		customTimeout := 30 * time.Second
+		config := &Config{
+			Method:     utils.ToPtr("POST"),
+			Timeout:    &customTimeout,
+			DodosCount: utils.ToPtr(uint(10)),
+			Yes:        utils.ToPtr(true),
+			SkipVerify: utils.ToPtr(true),
+			Headers:    types.Headers{{Key: "User-Agent", Value: []string{"custom-agent"}}},
+		}
+
+		config.SetDefaults()
+
+		assert.Equal(t, "POST", *config.Method, "Method should not be overridden")
+		assert.Equal(t, customTimeout, *config.Timeout, "Timeout should not be overridden")
+		assert.Equal(t, uint(10), *config.DodosCount, "DodosCount should not be overridden")
+		assert.True(t, *config.Yes, "Yes should not be overridden")
+		assert.True(t, *config.SkipVerify, "SkipVerify should not be overridden")
+		assert.Equal(t, "custom-agent", config.Headers[0].Value[0], "User-Agent should not be overridden")
+		assert.Len(t, config.Headers, 1, "Should not add duplicate User-Agent")
+	})
+
+	t.Run("SetDefaults adds User-Agent when missing", func(t *testing.T) {
+		config := &Config{
+			Files:   []types.ConfigFile{},
+			Headers: types.Headers{{Key: "Content-Type", Value: []string{"application/json"}}},
+		}
+
+		config.SetDefaults()
+
+		assert.Len(t, config.Headers, 2)
+		assert.True(t, config.Headers.Has("User-Agent"))
+		assert.True(t, config.Headers.Has("Content-Type"))
+
+		var userAgentFound bool
+		for _, h := range config.Headers {
+			if h.Key == "User-Agent" {
+				userAgentFound = true
+				assert.Equal(t, Defaults.UserAgent, h.Value[0])
+				break
+			}
+		}
+		assert.True(t, userAgentFound, "User-Agent header should be added")
+	})
+
+	t.Run("SetDefaults with partial config", func(t *testing.T) {
+		config := &Config{
+			Files:  []types.ConfigFile{},
+			Method: utils.ToPtr("PUT"),
+			Yes:    utils.ToPtr(true),
+		}
+
+		config.SetDefaults()
+
+		assert.Equal(t, "PUT", *config.Method, "Existing Method should be preserved")
+		assert.True(t, *config.Yes, "Existing Yes should be preserved")
+
+		require.NotNil(t, config.Timeout)
+		assert.Equal(t, Defaults.RequestTimeout, *config.Timeout, "Timeout should be set to default")
+
+		require.NotNil(t, config.DodosCount)
+		assert.Equal(t, Defaults.DodosCount, *config.DodosCount, "DodosCount should be set to default")
+
+		require.NotNil(t, config.SkipVerify)
+		assert.Equal(t, Defaults.SkipVerify, *config.SkipVerify, "SkipVerify should be set to default")
+
+		assert.True(t, config.Headers.Has("User-Agent"))
+	})
+
+	t.Run("SetDefaults idempotent", func(t *testing.T) {
+		config := &Config{}
+
+		config.SetDefaults()
+		firstCallHeaders := len(config.Headers)
+		firstCallMethod := *config.Method
+		firstCallTimeout := *config.Timeout
+
+		config.SetDefaults()
+
+		assert.Len(t, config.Headers, firstCallHeaders, "Headers count should not change on second call")
+		assert.Equal(t, firstCallMethod, *config.Method, "Method should not change on second call")
+		assert.Equal(t, firstCallTimeout, *config.Timeout, "Timeout should not change on second call")
+	})
+
+	t.Run("SetDefaults with empty Headers initializes correctly", func(t *testing.T) {
+		config := &Config{
+			Files:   []types.ConfigFile{},
+			Headers: types.Headers{},
+		}
+
+		config.SetDefaults()
+
+		assert.Len(t, config.Headers, 1)
+		assert.Equal(t, "User-Agent", config.Headers[0].Key)
+		assert.Equal(t, Defaults.UserAgent, config.Headers[0].Value[0])
+	})
+}

pkg/types/body.go

@@ -0,0 +1,23 @@
+package types
+
+type Body string
+
+func (body Body) String() string {
+	return string(body)
+}
+
+type Bodies []Body
+
+func (bodies *Bodies) Append(body Body) {
+	*bodies = append(*bodies, body)
+}
+
+func (bodies *Bodies) Parse(rawValues ...string) {
+	for _, rawValue := range rawValues {
+		bodies.Append(ParseBody(rawValue))
+	}
+}
+
+func ParseBody(rawValue string) Body {
+	return Body(rawValue)
+}

pkg/types/body_test.go

@@ -0,0 +1,160 @@
+package types
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestBody_String(t *testing.T) {
+	t.Run("Body String returns correct value", func(t *testing.T) {
+		body := Body("test body content")
+		assert.Equal(t, "test body content", body.String())
+	})
+
+	t.Run("Body String with empty body", func(t *testing.T) {
+		body := Body("")
+		assert.Empty(t, body.String())
+	})
+
+	t.Run("Body String with JSON", func(t *testing.T) {
+		body := Body(`{"key": "value", "number": 42}`)
+		assert.JSONEq(t, `{"key": "value", "number": 42}`, body.String())
+	})
+
+	t.Run("Body String with special characters", func(t *testing.T) {
+		body := Body("special: !@#$%^&*()\nnewline\ttab")
+		assert.Equal(t, "special: !@#$%^&*()\nnewline\ttab", body.String())
+	})
+}
+
+func TestBodies_Append(t *testing.T) {
+	t.Run("Append single body", func(t *testing.T) {
+		bodies := &Bodies{}
+		bodies.Append(Body("first body"))
+
+		assert.Len(t, *bodies, 1)
+		assert.Equal(t, Body("first body"), (*bodies)[0])
+	})
+
+	t.Run("Append multiple bodies", func(t *testing.T) {
+		bodies := &Bodies{}
+		bodies.Append(Body("first"))
+		bodies.Append(Body("second"))
+		bodies.Append(Body("third"))
+
+		assert.Len(t, *bodies, 3)
+		assert.Equal(t, Body("first"), (*bodies)[0])
+		assert.Equal(t, Body("second"), (*bodies)[1])
+		assert.Equal(t, Body("third"), (*bodies)[2])
+	})
+
+	t.Run("Append to existing bodies", func(t *testing.T) {
+		bodies := &Bodies{Body("existing")}
+		bodies.Append(Body("new"))
+
+		assert.Len(t, *bodies, 2)
+		assert.Equal(t, Body("existing"), (*bodies)[0])
+		assert.Equal(t, Body("new"), (*bodies)[1])
+	})
+
+	t.Run("Append empty body", func(t *testing.T) {
+		bodies := &Bodies{}
+		bodies.Append(Body(""))
+
+		assert.Len(t, *bodies, 1)
+		assert.Empty(t, (*bodies)[0].String())
+	})
+}
+
+func TestBodies_Parse(t *testing.T) {
+	t.Run("Parse single value", func(t *testing.T) {
+		bodies := &Bodies{}
+		bodies.Parse("test body")
+
+		assert.Len(t, *bodies, 1)
+		assert.Equal(t, Body("test body"), (*bodies)[0])
+	})
+
+	t.Run("Parse multiple values", func(t *testing.T) {
+		bodies := &Bodies{}
+		bodies.Parse("body1", "body2", "body3")
+
+		assert.Len(t, *bodies, 3)
+		assert.Equal(t, Body("body1"), (*bodies)[0])
+		assert.Equal(t, Body("body2"), (*bodies)[1])
+		assert.Equal(t, Body("body3"), (*bodies)[2])
+	})
+
+	t.Run("Parse with existing bodies", func(t *testing.T) {
+		bodies := &Bodies{Body("existing")}
+		bodies.Parse("new1", "new2")
+
+		assert.Len(t, *bodies, 3)
+		assert.Equal(t, Body("existing"), (*bodies)[0])
+		assert.Equal(t, Body("new1"), (*bodies)[1])
+		assert.Equal(t, Body("new2"), (*bodies)[2])
+	})
+
+	t.Run("Parse empty values", func(t *testing.T) {
+		bodies := &Bodies{}
+		bodies.Parse("", "", "")
+
+		assert.Len(t, *bodies, 3)
+		for _, body := range *bodies {
+			assert.Empty(t, body.String())
+		}
+	})
+
+	t.Run("Parse no arguments", func(t *testing.T) {
+		bodies := &Bodies{}
+		bodies.Parse()
+
+		assert.Empty(t, *bodies)
+	})
+
+	t.Run("Parse JSON strings", func(t *testing.T) {
+		bodies := &Bodies{}
+		bodies.Parse(`{"key": "value"}`, `{"array": [1, 2, 3]}`)
+
+		assert.Len(t, *bodies, 2)
+		assert.JSONEq(t, `{"key": "value"}`, (*bodies)[0].String())
+		assert.JSONEq(t, `{"array": [1, 2, 3]}`, (*bodies)[1].String())
+	})
+}
+
+func TestParseBody(t *testing.T) {
+	t.Run("ParseBody with regular string", func(t *testing.T) {
+		body := ParseBody("test content")
+		assert.Equal(t, Body("test content"), body)
+	})
+
+	t.Run("ParseBody with empty string", func(t *testing.T) {
+		body := ParseBody("")
+		assert.Equal(t, Body(""), body)
+	})
+
+	t.Run("ParseBody with multiline string", func(t *testing.T) {
+		input := "line1\nline2\nline3"
+		body := ParseBody(input)
+		assert.Equal(t, Body(input), body)
+	})
+
+	t.Run("ParseBody with special characters", func(t *testing.T) {
+		input := "!@#$%^&*()_+-=[]{}|;':\",./<>?"
+		body := ParseBody(input)
+		assert.Equal(t, Body(input), body)
+	})
+
+	t.Run("ParseBody with unicode", func(t *testing.T) {
+		input := "Hello World 🌍"
+		body := ParseBody(input)
+		assert.Equal(t, Body(input), body)
+	})
+
+	t.Run("ParseBody preserves whitespace", func(t *testing.T) {
+		input := "  leading and trailing spaces  "
+		body := ParseBody(input)
+		assert.Equal(t, Body(input), body)
+	})
+}

pkg/types/config_file.go

@@ -0,0 +1,79 @@
+package types
+
+import (
+	"net/url"
+	"path/filepath"
+	"strings"
+)
+
+type ConfigFileType string
+
+const (
+	ConfigFileTypeYAML ConfigFileType = "yaml/yml"
+)
+
+type ConfigFileLocationType string
+
+const (
+	ConfigFileLocationLocal  ConfigFileLocationType = "local"
+	ConfigFileLocationRemote ConfigFileLocationType = "remote"
+)
+
+type ConfigFile struct {
+	path         string
+	_type        ConfigFileType
+	locationType ConfigFileLocationType
+}
+
+func (configFile ConfigFile) String() string {
+	return configFile.path
+}
+
+func (configFile ConfigFile) Type() ConfigFileType {
+	return configFile._type
+}
+
+func (configFile ConfigFile) LocationType() ConfigFileLocationType {
+	return configFile.locationType
+}
+
+// ParseConfigFile parses a raw string representing a configuration file
+// path or URL and returns a ConfigFile struct.
+// It determines the file's type and location (local or remote) based on the string.
+// It can return the following errors:
+// - ErrConfigFileExtensionNotFound
+// - RemoteConfigFileParseError
+// - UnknownConfigFileTypeError
+func ParseConfigFile(configFileRaw string) (*ConfigFile, error) {
+	configFileParsed := &ConfigFile{
+		path:         configFileRaw,
+		locationType: ConfigFileLocationLocal,
+	}
+
+	if strings.HasPrefix(configFileRaw, "http://") || strings.HasPrefix(configFileRaw, "https://") {
+		configFileParsed.locationType = ConfigFileLocationRemote
+	}
+
+	configFilePath := configFileRaw
+	if configFileParsed.locationType == ConfigFileLocationRemote {
+		remoteConfigFileParsed, err := url.Parse(configFileRaw)
+		if err != nil {
+			return nil, NewRemoteConfigFileParseError(err)
+		}
+		configFilePath = remoteConfigFileParsed.Path
+	}
+
+	configFileExtension, _ := strings.CutPrefix(filepath.Ext(configFilePath), ".")
+	if configFileExtension == "" {
+		return nil, ErrConfigFileExtensionNotFound
+	}
+
+	switch strings.ToLower(configFileExtension) {
+	case "yml", "yaml":
+		configFileParsed._type = ConfigFileTypeYAML
+	default:
+		return nil, NewUnknownConfigFileTypeError(configFileExtension)
+	}
+
+	return configFileParsed, nil
+}

pkg/types/config_file_test.go

@@ -0,0 +1,187 @@
+package types
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestConfigFile_String(t *testing.T) {
+	t.Run("String returns the file path", func(t *testing.T) {
+		configFile := ConfigFile{path: "/path/to/config.yaml"}
+		assert.Equal(t, "/path/to/config.yaml", configFile.String())
+	})
+
+	t.Run("String returns empty path", func(t *testing.T) {
+		configFile := ConfigFile{path: ""}
+		assert.Empty(t, configFile.String())
+	})
+}
+
+func TestConfigFile_Type(t *testing.T) {
+	t.Run("Type returns the config file type", func(t *testing.T) {
+		configFile := ConfigFile{_type: ConfigFileTypeYAML}
+		assert.Equal(t, ConfigFileTypeYAML, configFile.Type())
+	})
+}
+
+func TestConfigFile_LocationType(t *testing.T) {
+	t.Run("LocationType returns local", func(t *testing.T) {
+		configFile := ConfigFile{locationType: ConfigFileLocationLocal}
+		assert.Equal(t, ConfigFileLocationLocal, configFile.LocationType())
+	})
+
+	t.Run("LocationType returns remote", func(t *testing.T) {
+		configFile := ConfigFile{locationType: ConfigFileLocationRemote}
+		assert.Equal(t, ConfigFileLocationRemote, configFile.LocationType())
+	})
+}
+
+func TestParseConfigFile(t *testing.T) {
+	t.Run("Parse local YAML file with yml extension", func(t *testing.T) {
+		configFile, err := ParseConfigFile("config.yml")
+
+		require.NoError(t, err)
+		require.NotNil(t, configFile)
+		assert.Equal(t, "config.yml", configFile.String())
+		assert.Equal(t, ConfigFileTypeYAML, configFile.Type())
+		assert.Equal(t, ConfigFileLocationLocal, configFile.LocationType())
+	})
+
+	t.Run("Parse local YAML file with yaml extension", func(t *testing.T) {
+		configFile, err := ParseConfigFile("config.yaml")
+
+		require.NoError(t, err)
+		require.NotNil(t, configFile)
+		assert.Equal(t, "config.yaml", configFile.String())
+		assert.Equal(t, ConfigFileTypeYAML, configFile.Type())
+		assert.Equal(t, ConfigFileLocationLocal, configFile.LocationType())
+	})
+
+	t.Run("Parse local YAML file with uppercase extensions", func(t *testing.T) {
+		testCases := []string{"config.YML", "config.YAML", "config.Yml", "config.Yaml"}
+
+		for _, testCase := range testCases {
+			t.Run("Extension: "+testCase, func(t *testing.T) {
+				configFile, err := ParseConfigFile(testCase)
+
+				require.NoError(t, err)
+				require.NotNil(t, configFile)
+				assert.Equal(t, testCase, configFile.String())
+				assert.Equal(t, ConfigFileTypeYAML, configFile.Type())
+				assert.Equal(t, ConfigFileLocationLocal, configFile.LocationType())
+			})
+		}
+	})
+
+	t.Run("Parse remote HTTP YAML file", func(t *testing.T) {
+		configFile, err := ParseConfigFile("http://example.com/config.yaml")
+
+		require.NoError(t, err)
+		require.NotNil(t, configFile)
+		assert.Equal(t, "http://example.com/config.yaml", configFile.String())
+		assert.Equal(t, ConfigFileTypeYAML, configFile.Type())
+		assert.Equal(t, ConfigFileLocationRemote, configFile.LocationType())
+	})
+
+	t.Run("Parse remote HTTPS YAML file", func(t *testing.T) {
+		configFile, err := ParseConfigFile("https://example.com/path/config.yml")
+
+		require.NoError(t, err)
+		require.NotNil(t, configFile)
+		assert.Equal(t, "https://example.com/path/config.yml", configFile.String())
+		assert.Equal(t, ConfigFileTypeYAML, configFile.Type())
+		assert.Equal(t, ConfigFileLocationRemote, configFile.LocationType())
+	})
+
+	t.Run("Parse file with path separators", func(t *testing.T) {
+		configFile, err := ParseConfigFile("/path/to/config.yaml")
+
+		require.NoError(t, err)
+		require.NotNil(t, configFile)
+		assert.Equal(t, "/path/to/config.yaml", configFile.String())
+		assert.Equal(t, ConfigFileTypeYAML, configFile.Type())
+		assert.Equal(t, ConfigFileLocationLocal, configFile.LocationType())
+	})
+
+	t.Run("Parse file without extension returns error", func(t *testing.T) {
+		configFile, err := ParseConfigFile("config")
+
+		require.Error(t, err)
+		assert.Equal(t, ErrConfigFileExtensionNotFound, err)
+		assert.Nil(t, configFile)
+	})
+
+	t.Run("Parse file with unsupported extension returns error", func(t *testing.T) {
+		configFile, err := ParseConfigFile("config.json")
+
+		require.Error(t, err)
+		assert.IsType(t, UnknownConfigFileTypeError{}, err)
+		assert.Contains(t, err.Error(), "json")
+		assert.Nil(t, configFile)
+	})
+
+	t.Run("Parse remote file with invalid URL returns error", func(t *testing.T) {
+		configFile, err := ParseConfigFile("http://192.168.1.%30/config.yaml")
+
+		require.Error(t, err)
+		assert.IsType(t, RemoteConfigFileParseError{}, err)
+		assert.Nil(t, configFile)
+	})
+
+	t.Run("Parse remote file without extension returns error", func(t *testing.T) {
+		configFile, err := ParseConfigFile("https://example.com/config")
+
+		require.Error(t, err)
+		assert.Equal(t, ErrConfigFileExtensionNotFound, err)
+		assert.Nil(t, configFile)
+	})
+
+	t.Run("Parse remote file with unsupported extension returns error", func(t *testing.T) {
+		configFile, err := ParseConfigFile("https://example.com/config.txt")
+
+		require.Error(t, err)
+		assert.IsType(t, UnknownConfigFileTypeError{}, err)
+		assert.Contains(t, err.Error(), "txt")
+		assert.Nil(t, configFile)
+	})
+
+	t.Run("Parse empty string returns error", func(t *testing.T) {
+		configFile, err := ParseConfigFile("")
+
+		require.Error(t, err)
+		assert.Equal(t, ErrConfigFileExtensionNotFound, err)
+		assert.Nil(t, configFile)
+	})
+
+	t.Run("Parse file with multiple dots in name", func(t *testing.T) {
+		configFile, err := ParseConfigFile("config.test.yaml")
+
+		require.NoError(t, err)
+		require.NotNil(t, configFile)
+		assert.Equal(t, "config.test.yaml", configFile.String())
+		assert.Equal(t, ConfigFileTypeYAML, configFile.Type())
+		assert.Equal(t, ConfigFileLocationLocal, configFile.LocationType())
+	})
+
+	t.Run("Parse remote URL with query parameters and fragment", func(t *testing.T) {
+		configFile, err := ParseConfigFile("https://example.com/path/config.yaml?version=1&format=yaml#section")
+
+		require.NoError(t, err)
+		require.NotNil(t, configFile)
+		assert.Equal(t, "https://example.com/path/config.yaml?version=1&format=yaml#section", configFile.String())
+		assert.Equal(t, ConfigFileTypeYAML, configFile.Type())
+		assert.Equal(t, ConfigFileLocationRemote, configFile.LocationType())
+	})
+
+	t.Run("Parse remote URL with port", func(t *testing.T) {
+		configFile, err := ParseConfigFile("https://example.com:8080/config.yml")
+
+		require.NoError(t, err)
+		require.NotNil(t, configFile)
+		assert.Equal(t, "https://example.com:8080/config.yml", configFile.String())
+		assert.Equal(t, ConfigFileTypeYAML, configFile.Type())
+		assert.Equal(t, ConfigFileLocationRemote, configFile.LocationType())
+	})
+}

pkg/types/cookie.go

@@ -0,0 +1,42 @@
+package types
+
+import "strings"
+
+type Cookie KeyValue[string, []string]
+
+type Cookies []Cookie
+
+func (cookies Cookies) GetValue(key string) *[]string {
+	for i := range cookies {
+		if cookies[i].Key == key {
+			return &cookies[i].Value
+		}
+	}
+	return nil
+}
+
+func (cookies *Cookies) Append(cookie Cookie) {
+	if item := cookies.GetValue(cookie.Key); item != nil {
+		*item = append(*item, cookie.Value...)
+	} else {
+		*cookies = append(*cookies, cookie)
+	}
+}
+
+func (cookies *Cookies) Parse(rawValues ...string) {
+	for _, rawValue := range rawValues {
+		cookies.Append(*ParseCookie(rawValue))
+	}
+}
+
+func ParseCookie(rawValue string) *Cookie {
+	parts := strings.SplitN(rawValue, "=", 2)
+	switch len(parts) {
+	case 1:
+		return &Cookie{Key: parts[0], Value: []string{""}}
+	case 2:
+		return &Cookie{Key: parts[0], Value: []string{parts[1]}}
+	default:
+		return &Cookie{Key: "", Value: []string{""}}
+	}
+}

pkg/types/cookie_test.go

@@ -0,0 +1,240 @@
+package types
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCookies_GetValue(t *testing.T) {
+	t.Run("GetValue returns existing cookie value", func(t *testing.T) {
+		cookies := Cookies{
+			{Key: "session", Value: []string{"abc123"}},
+			{Key: "user", Value: []string{"john"}},
+		}
+
+		value := cookies.GetValue("session")
+		require.NotNil(t, value)
+		assert.Equal(t, []string{"abc123"}, *value)
+	})
+
+	t.Run("GetValue returns nil for non-existent cookie", func(t *testing.T) {
+		cookies := Cookies{
+			{Key: "session", Value: []string{"abc123"}},
+		}
+
+		value := cookies.GetValue("nonexistent")
+		assert.Nil(t, value)
+	})
+
+	t.Run("GetValue with empty cookies", func(t *testing.T) {
+		cookies := Cookies{}
+
+		value := cookies.GetValue("any")
+		assert.Nil(t, value)
+	})
+
+	t.Run("GetValue with multiple values", func(t *testing.T) {
+		cookies := Cookies{
+			{Key: "multi", Value: []string{"val1", "val2", "val3"}},
+		}
+
+		value := cookies.GetValue("multi")
+		require.NotNil(t, value)
+		assert.Equal(t, []string{"val1", "val2", "val3"}, *value)
+	})
+
+	t.Run("GetValue case sensitive", func(t *testing.T) {
+		cookies := Cookies{
+			{Key: "Cookie", Value: []string{"value"}},
+		}
+
+		value1 := cookies.GetValue("Cookie")
+		require.NotNil(t, value1)
+		assert.Equal(t, []string{"value"}, *value1)
+
+		value2 := cookies.GetValue("cookie")
+		assert.Nil(t, value2)
+	})
+}
+
+func TestCookies_Append(t *testing.T) {
+	t.Run("Append new cookie", func(t *testing.T) {
+		cookies := &Cookies{}
+		cookies.Append(Cookie{Key: "session", Value: []string{"abc123"}})
+
+		assert.Len(t, *cookies, 1)
+		assert.Equal(t, "session", (*cookies)[0].Key)
+		assert.Equal(t, []string{"abc123"}, (*cookies)[0].Value)
+	})
+
+	t.Run("Append to existing cookie key", func(t *testing.T) {
+		cookies := &Cookies{
+			{Key: "session", Value: []string{"abc123"}},
+		}
+		cookies.Append(Cookie{Key: "session", Value: []string{"def456"}})
+
+		assert.Len(t, *cookies, 1)
+		assert.Equal(t, []string{"abc123", "def456"}, (*cookies)[0].Value)
+	})
+
+	t.Run("Append different cookies", func(t *testing.T) {
+		cookies := &Cookies{}
+		cookies.Append(Cookie{Key: "session", Value: []string{"abc"}})
+		cookies.Append(Cookie{Key: "user", Value: []string{"john"}})
+		cookies.Append(Cookie{Key: "token", Value: []string{"xyz"}})
+
+		assert.Len(t, *cookies, 3)
+	})
+
+	t.Run("Append multiple values at once", func(t *testing.T) {
+		cookies := &Cookies{
+			{Key: "tags", Value: []string{"tag1"}},
+		}
+		cookies.Append(Cookie{Key: "tags", Value: []string{"tag2", "tag3"}})
+
+		assert.Len(t, *cookies, 1)
+		assert.Equal(t, []string{"tag1", "tag2", "tag3"}, (*cookies)[0].Value)
+	})
+
+	t.Run("Append empty value", func(t *testing.T) {
+		cookies := &Cookies{}
+		cookies.Append(Cookie{Key: "empty", Value: []string{""}})
+
+		assert.Len(t, *cookies, 1)
+		assert.Equal(t, []string{""}, (*cookies)[0].Value)
+	})
+}
+
+func TestCookies_Parse(t *testing.T) {
+	t.Run("Parse single cookie", func(t *testing.T) {
+		cookies := &Cookies{}
+		cookies.Parse("session=abc123")
+
+		assert.Len(t, *cookies, 1)
+		assert.Equal(t, "session", (*cookies)[0].Key)
+		assert.Equal(t, []string{"abc123"}, (*cookies)[0].Value)
+	})
+
+	t.Run("Parse multiple cookies", func(t *testing.T) {
+		cookies := &Cookies{}
+		cookies.Parse("session=abc123", "user=john", "token=xyz789")
+
+		assert.Len(t, *cookies, 3)
+		assert.Equal(t, "session", (*cookies)[0].Key)
+		assert.Equal(t, "user", (*cookies)[1].Key)
+		assert.Equal(t, "token", (*cookies)[2].Key)
+	})
+
+	t.Run("Parse cookies with same key", func(t *testing.T) {
+		cookies := &Cookies{}
+		cookies.Parse("pref=dark", "pref=large", "pref=en")
+
+		assert.Len(t, *cookies, 1)
+		assert.Equal(t, []string{"dark", "large", "en"}, (*cookies)[0].Value)
+	})
+
+	t.Run("Parse cookie without value", func(t *testing.T) {
+		cookies := &Cookies{}
+		cookies.Parse("sessionid")
+
+		assert.Len(t, *cookies, 1)
+		assert.Equal(t, "sessionid", (*cookies)[0].Key)
+		assert.Equal(t, []string{""}, (*cookies)[0].Value)
+	})
+
+	t.Run("Parse cookie with empty value", func(t *testing.T) {
+		cookies := &Cookies{}
+		cookies.Parse("empty=")
+
+		assert.Len(t, *cookies, 1)
+		assert.Equal(t, "empty", (*cookies)[0].Key)
+		assert.Equal(t, []string{""}, (*cookies)[0].Value)
+	})
+
+	t.Run("Parse cookie with multiple equals", func(t *testing.T) {
+		cookies := &Cookies{}
+		cookies.Parse("data=key=value=test")
+
+		assert.Len(t, *cookies, 1)
+		assert.Equal(t, "data", (*cookies)[0].Key)
+		assert.Equal(t, []string{"key=value=test"}, (*cookies)[0].Value)
+	})
+
+	t.Run("Parse no arguments", func(t *testing.T) {
+		cookies := &Cookies{}
+		cookies.Parse()
+
+		assert.Empty(t, *cookies)
+	})
+
+	t.Run("Parse with existing cookies", func(t *testing.T) {
+		cookies := &Cookies{
+			{Key: "existing", Value: []string{"value"}},
+		}
+		cookies.Parse("new=cookie")
+
+		assert.Len(t, *cookies, 2)
+		assert.Equal(t, "existing", (*cookies)[0].Key)
+		assert.Equal(t, "new", (*cookies)[1].Key)
+	})
+}
+
+func TestParseCookie(t *testing.T) {
+	t.Run("ParseCookie with key and value", func(t *testing.T) {
+		cookie := ParseCookie("session=abc123")
+		require.NotNil(t, cookie)
+		assert.Equal(t, "session", cookie.Key)
+		assert.Equal(t, []string{"abc123"}, cookie.Value)
+	})
+
+	t.Run("ParseCookie with only key", func(t *testing.T) {
+		cookie := ParseCookie("sessionid")
+		require.NotNil(t, cookie)
+		assert.Equal(t, "sessionid", cookie.Key)
+		assert.Equal(t, []string{""}, cookie.Value)
+	})
+
+	t.Run("ParseCookie with empty value", func(t *testing.T) {
+		cookie := ParseCookie("key=")
+		require.NotNil(t, cookie)
+		assert.Equal(t, "key", cookie.Key)
+		assert.Equal(t, []string{""}, cookie.Value)
+	})
+
+	t.Run("ParseCookie with multiple equals", func(t *testing.T) {
+		cookie := ParseCookie("data=base64=encoded=value")
+		require.NotNil(t, cookie)
+		assert.Equal(t, "data", cookie.Key)
+		assert.Equal(t, []string{"base64=encoded=value"}, cookie.Value)
+	})
+
+	t.Run("ParseCookie with empty string", func(t *testing.T) {
+		cookie := ParseCookie("")
+		require.NotNil(t, cookie)
+		assert.Empty(t, cookie.Key)
+		assert.Equal(t, []string{""}, cookie.Value)
+	})
+
+	t.Run("ParseCookie with spaces", func(t *testing.T) {
+		cookie := ParseCookie("key with spaces=value with spaces")
+		require.NotNil(t, cookie)
+		assert.Equal(t, "key with spaces", cookie.Key)
+		assert.Equal(t, []string{"value with spaces"}, cookie.Value)
+	})
+
+	t.Run("ParseCookie with special characters", func(t *testing.T) {
+		cookie := ParseCookie("key-._~=val!@#$%^&*()")
+		require.NotNil(t, cookie)
+		assert.Equal(t, "key-._~", cookie.Key)
+		assert.Equal(t, []string{"val!@#$%^&*()"}, cookie.Value)
+	})
+
+	t.Run("ParseCookie with URL encoded value", func(t *testing.T) {
+		cookie := ParseCookie("data=hello%20world%3D%26")
+		require.NotNil(t, cookie)
+		assert.Equal(t, "data", cookie.Key)
+		assert.Equal(t, []string{"hello%20world%3D%26"}, cookie.Value)
+	})
+}

pkg/types/errors.go

@@ -0,0 +1,114 @@
+package types
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+)
+
+var (
+	// General
+	ErrNoError = errors.New("no error (internal)")
+
+	// CLI
+	ErrCLINoArgs         = errors.New("CLI expects arguments but received none")
+	ErrCLIUnexpectedArgs = errors.New("CLI received unexpected arguments")
+
+	// Config File
+	ErrConfigFileExtensionNotFound = errors.New("config file extension not found")
+)
+
+// ======================================== General ========================================
+
+type FieldParseError struct {
+	Field string
+	Value string
+	Err   error
+}
+
+func NewFieldParseError(field string, value string, err error) *FieldParseError {
+	if err == nil {
+		err = ErrNoError
+	}
+	return &FieldParseError{field, value, err}
+}
+
+func (e FieldParseError) Error() string {
+	return fmt.Sprintf("Field '%s' parse failed: %v", e.Field, e.Err)
+}
+
+func (e FieldParseError) Unwrap() error {
+	return e.Err
+}
+
+type FieldParseErrors struct {
+	Errors []FieldParseError
+}
+
+func NewFieldParseErrors(fieldParseErrors []FieldParseError) FieldParseErrors {
+	return FieldParseErrors{fieldParseErrors}
+}
+
+func (e FieldParseErrors) Error() string {
+	if len(e.Errors) == 0 {
+		return "No field parse errors"
+	}
+	if len(e.Errors) == 1 {
+		return e.Errors[0].Error()
+	}
+
+	errorString := ""
+	for _, err := range e.Errors {
+		errorString += err.Error() + "\n"
+	}
+	errorString, _ = strings.CutSuffix(errorString, "\n")
+
+	return errorString
+}
+
+// ======================================== CLI ========================================
+
+type CLIUnexpectedArgsError struct {
+	Args []string
+}
+
+func NewCLIUnexpectedArgsError(args []string) CLIUnexpectedArgsError {
+	return CLIUnexpectedArgsError{args}
+}
+
+func (e CLIUnexpectedArgsError) Error() string {
+	return fmt.Sprintf("CLI received unexpected arguments: %v", strings.Join(e.Args, ","))
+}
+
+// ======================================== Config File ========================================
+
+type RemoteConfigFileParseError struct {
+	error error
+}
+
+func NewRemoteConfigFileParseError(err error) RemoteConfigFileParseError {
+	if err == nil {
+		err = ErrNoError
+	}
+	return RemoteConfigFileParseError{err}
+}
+
+func (e RemoteConfigFileParseError) Error() string {
+	return "Remote config file parse error: " + e.error.Error()
+}
+
+func (e RemoteConfigFileParseError) Unwrap() error {
+	return e.error
+}
+
+type UnknownConfigFileTypeError struct {
+	Type string
+}
+
+func NewUnknownConfigFileTypeError(_type string) UnknownConfigFileTypeError {
+	return UnknownConfigFileTypeError{_type}
+}
+
+func (e UnknownConfigFileTypeError) Error() string {
+	return "Unknown config file type: " + e.Type
+}

pkg/types/errors_test.go

@@ -0,0 +1,286 @@
+package types
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFieldParseError_Error(t *testing.T) {
+	t.Run("Error returns formatted message", func(t *testing.T) {
+		originalErr := errors.New("invalid value")
+		fieldErr := NewFieldParseError("username", "testuser", originalErr)
+
+		expected := "Field 'username' parse failed: invalid value"
+		assert.Equal(t, expected, fieldErr.Error())
+	})
+
+	t.Run("Error with empty field name", func(t *testing.T) {
+		originalErr := errors.New("test error")
+		fieldErr := NewFieldParseError("", "somevalue", originalErr)
+
+		expected := "Field '' parse failed: test error"
+		assert.Equal(t, expected, fieldErr.Error())
+	})
+
+	t.Run("Error with nil underlying error", func(t *testing.T) {
+		fieldErr := NewFieldParseError("field", "value123", nil)
+
+		expected := "Field 'field' parse failed: no error (internal)"
+		assert.Equal(t, expected, fieldErr.Error())
+	})
+}
+
+func TestFieldParseError_Unwrap(t *testing.T) {
+	t.Run("Unwrap returns original error", func(t *testing.T) {
+		originalErr := errors.New("original error")
+		fieldErr := NewFieldParseError("field", "value", originalErr)
+
+		assert.Equal(t, originalErr, fieldErr.Unwrap())
+	})
+
+	t.Run("Unwrap with nil error", func(t *testing.T) {
+		fieldErr := NewFieldParseError("field", "value", nil)
+
+		assert.Equal(t, ErrNoError, fieldErr.Unwrap())
+	})
+}
+
+func TestNewFieldParseError(t *testing.T) {
+	t.Run("Creates FieldParseError with correct values", func(t *testing.T) {
+		originalErr := errors.New("test error")
+		fieldErr := NewFieldParseError("testField", "testValue", originalErr)
+
+		assert.Equal(t, "testField", fieldErr.Field)
+		assert.Equal(t, "testValue", fieldErr.Value)
+		assert.Equal(t, originalErr, fieldErr.Err)
+	})
+
+	t.Run("Creates FieldParseError with ErrNoError when nil passed", func(t *testing.T) {
+		fieldErr := NewFieldParseError("testField", "testValue", nil)
+
+		assert.Equal(t, "testField", fieldErr.Field)
+		assert.Equal(t, "testValue", fieldErr.Value)
+		assert.Equal(t, ErrNoError, fieldErr.Err)
+	})
+}
+
+func TestFieldParseErrors_Error(t *testing.T) {
+	t.Run("Error with no errors returns default message", func(t *testing.T) {
+		fieldErrors := NewFieldParseErrors([]FieldParseError{})
+
+		assert.Equal(t, "No field parse errors", fieldErrors.Error())
+	})
+
+	t.Run("Error with single error returns single error message", func(t *testing.T) {
+		fieldErr := *NewFieldParseError("field1", "value1", errors.New("error1"))
+		fieldErrors := NewFieldParseErrors([]FieldParseError{fieldErr})
+
+		expected := "Field 'field1' parse failed: error1"
+		assert.Equal(t, expected, fieldErrors.Error())
+	})
+
+	t.Run("Error with multiple errors returns concatenated messages", func(t *testing.T) {
+		fieldErr1 := *NewFieldParseError("field1", "value1", errors.New("error1"))
+		fieldErr2 := *NewFieldParseError("field2", "value2", errors.New("error2"))
+		fieldErr3 := *NewFieldParseError("field3", "value3", errors.New("error3"))
+		fieldErrors := NewFieldParseErrors([]FieldParseError{fieldErr1, fieldErr2, fieldErr3})
+
+		expected := "Field 'field1' parse failed: error1\nField 'field2' parse failed: error2\nField 'field3' parse failed: error3"
+		assert.Equal(t, expected, fieldErrors.Error())
+	})
+
+	t.Run("Error with two errors", func(t *testing.T) {
+		fieldErr1 := *NewFieldParseError("username", "john", errors.New("too short"))
+		fieldErr2 := *NewFieldParseError("email", "invalid", errors.New("invalid format"))
+		fieldErrors := NewFieldParseErrors([]FieldParseError{fieldErr1, fieldErr2})
+
+		expected := "Field 'username' parse failed: too short\nField 'email' parse failed: invalid format"
+		assert.Equal(t, expected, fieldErrors.Error())
+	})
+}
+
+func TestNewFieldParseErrors(t *testing.T) {
+	t.Run("Creates FieldParseErrors with correct values", func(t *testing.T) {
+		fieldErr1 := *NewFieldParseError("field1", "value1", errors.New("error1"))
+		fieldErr2 := *NewFieldParseError("field2", "value2", errors.New("error2"))
+		fieldErrors := NewFieldParseErrors([]FieldParseError{fieldErr1, fieldErr2})
+
+		assert.Len(t, fieldErrors.Errors, 2)
+		assert.Equal(t, fieldErr1, fieldErrors.Errors[0])
+		assert.Equal(t, fieldErr2, fieldErrors.Errors[1])
+	})
+
+	t.Run("Creates FieldParseErrors with empty slice", func(t *testing.T) {
+		fieldErrors := NewFieldParseErrors([]FieldParseError{})
+
+		assert.Empty(t, fieldErrors.Errors)
+	})
+}
+
+func TestCLIUnexpectedArgsError_Error(t *testing.T) {
+	t.Run("Error with single argument", func(t *testing.T) {
+		err := NewCLIUnexpectedArgsError([]string{"arg1"})
+
+		expected := "CLI received unexpected arguments: arg1"
+		assert.Equal(t, expected, err.Error())
+	})
+
+	t.Run("Error with multiple arguments", func(t *testing.T) {
+		err := NewCLIUnexpectedArgsError([]string{"arg1", "arg2", "arg3"})
+
+		expected := "CLI received unexpected arguments: arg1,arg2,arg3"
+		assert.Equal(t, expected, err.Error())
+	})
+
+	t.Run("Error with empty arguments", func(t *testing.T) {
+		err := NewCLIUnexpectedArgsError([]string{})
+
+		expected := "CLI received unexpected arguments: "
+		assert.Equal(t, expected, err.Error())
+	})
+
+	t.Run("Error with arguments containing special characters", func(t *testing.T) {
+		err := NewCLIUnexpectedArgsError([]string{"--flag", "value with spaces", "-x"})
+
+		expected := "CLI received unexpected arguments: --flag,value with spaces,-x"
+		assert.Equal(t, expected, err.Error())
+	})
+}
+
+func TestNewCLIUnexpectedArgsError(t *testing.T) {
+	t.Run("Creates CLIUnexpectedArgsError with correct values", func(t *testing.T) {
+		args := []string{"arg1", "arg2"}
+		err := NewCLIUnexpectedArgsError(args)
+
+		assert.Equal(t, args, err.Args)
+	})
+}
+
+func TestRemoteConfigFileParseError_Error(t *testing.T) {
+	t.Run("Error returns formatted message", func(t *testing.T) {
+		originalErr := errors.New("invalid URL")
+		err := NewRemoteConfigFileParseError(originalErr)
+
+		expected := "Remote config file parse error: invalid URL"
+		assert.Equal(t, expected, err.Error())
+	})
+
+	t.Run("Error with nil underlying error", func(t *testing.T) {
+		err := NewRemoteConfigFileParseError(nil)
+
+		expected := "Remote config file parse error: no error (internal)"
+		assert.Equal(t, expected, err.Error())
+	})
+}
+
+func TestRemoteConfigFileParseError_Unwrap(t *testing.T) {
+	t.Run("Unwrap returns original error", func(t *testing.T) {
+		originalErr := errors.New("original error")
+		err := NewRemoteConfigFileParseError(originalErr)
+
+		assert.Equal(t, originalErr, err.Unwrap())
+	})
+
+	t.Run("Unwrap with nil error", func(t *testing.T) {
+		err := NewRemoteConfigFileParseError(nil)
+
+		assert.Equal(t, ErrNoError, err.Unwrap())
+	})
+}
+
+func TestNewRemoteConfigFileParseError(t *testing.T) {
+	t.Run("Creates RemoteConfigFileParseError with correct values", func(t *testing.T) {
+		originalErr := errors.New("test error")
+		err := NewRemoteConfigFileParseError(originalErr)
+
+		assert.Equal(t, originalErr, err.error)
+	})
+
+	t.Run("Creates RemoteConfigFileParseError with ErrNoError when nil passed", func(t *testing.T) {
+		err := NewRemoteConfigFileParseError(nil)
+
+		assert.Equal(t, ErrNoError, err.error)
+	})
+}
+
+func TestUnknownConfigFileTypeError_Error(t *testing.T) {
+	t.Run("Error returns formatted message", func(t *testing.T) {
+		err := NewUnknownConfigFileTypeError("json")
+
+		expected := "Unknown config file type: json"
+		assert.Equal(t, expected, err.Error())
+	})
+
+	t.Run("Error with empty type", func(t *testing.T) {
+		err := NewUnknownConfigFileTypeError("")
+
+		expected := "Unknown config file type: "
+		assert.Equal(t, expected, err.Error())
+	})
+
+	t.Run("Error with special characters in type", func(t *testing.T) {
+		err := NewUnknownConfigFileTypeError("type.with.dots")
+
+		expected := "Unknown config file type: type.with.dots"
+		assert.Equal(t, expected, err.Error())
+	})
+}
+
+func TestNewUnknownConfigFileTypeError(t *testing.T) {
+	t.Run("Creates UnknownConfigFileTypeError with correct values", func(t *testing.T) {
+		err := NewUnknownConfigFileTypeError("xml")
+
+		assert.Equal(t, "xml", err.Type)
+	})
+}
+
+func TestErrorConstants(t *testing.T) {
+	t.Run("ErrNoError has correct message", func(t *testing.T) {
+		expected := "no error (internal)"
+		assert.Equal(t, expected, ErrNoError.Error())
+	})
+
+	t.Run("ErrCLINoArgs has correct message", func(t *testing.T) {
+		expected := "CLI expects arguments but received none"
+		assert.Equal(t, expected, ErrCLINoArgs.Error())
+	})
+
+	t.Run("ErrCLIUnexpectedArgs has correct message", func(t *testing.T) {
+		expected := "CLI received unexpected arguments"
+		assert.Equal(t, expected, ErrCLIUnexpectedArgs.Error())
+	})
+
+	t.Run("ErrConfigFileExtensionNotFound has correct message", func(t *testing.T) {
+		expected := "config file extension not found"
+		assert.Equal(t, expected, ErrConfigFileExtensionNotFound.Error())
+	})
+}
+
+func TestErrorImplementsErrorInterface(t *testing.T) {
+	t.Run("FieldParseError implements error interface", func(t *testing.T) {
+		var err error = NewFieldParseError("field", "value", errors.New("test"))
+		assert.Error(t, err)
+	})
+
+	t.Run("FieldParseErrors implements error interface", func(t *testing.T) {
+		var err error = NewFieldParseErrors([]FieldParseError{})
+		assert.Error(t, err)
+	})
+
+	t.Run("CLIUnexpectedArgsError implements error interface", func(t *testing.T) {
+		var err error = NewCLIUnexpectedArgsError([]string{})
+		assert.Error(t, err)
+	})
+
+	t.Run("RemoteConfigFileParseError implements error interface", func(t *testing.T) {
+		var err error = NewRemoteConfigFileParseError(errors.New("test"))
+		assert.Error(t, err)
+	})
+
+	t.Run("UnknownConfigFileTypeError implements error interface", func(t *testing.T) {
+		var err error = NewUnknownConfigFileTypeError("test")
+		assert.Error(t, err)
+	})
+}

pkg/types/header.go

@@ -0,0 +1,52 @@
+package types
+
+import "strings"
+
+type Header KeyValue[string, []string]
+
+type Headers []Header
+
+// Has checks if a header with the given key exists.
+func (headers Headers) Has(key string) bool {
+	for i := range headers {
+		if headers[i].Key == key {
+			return true
+		}
+	}
+	return false
+}
+
+func (headers Headers) GetValue(key string) *[]string {
+	for i := range headers {
+		if headers[i].Key == key {
+			return &headers[i].Value
+		}
+	}
+	return nil
+}
+
+func (headers *Headers) Append(header Header) {
+	if item := headers.GetValue(header.Key); item != nil {
+		*item = append(*item, header.Value...)
+	} else {
+		*headers = append(*headers, header)
+	}
+}
+
+func (headers *Headers) Parse(rawValues ...string) {
+	for _, rawValue := range rawValues {
+		headers.Append(*ParseHeader(rawValue))
+	}
+}
+
+func ParseHeader(rawValue string) *Header {
+	parts := strings.SplitN(rawValue, ": ", 2)
+	switch len(parts) {
+	case 1:
+		return &Header{Key: parts[0], Value: []string{""}}
+	case 2:
+		return &Header{Key: parts[0], Value: []string{parts[1]}}
+	default:
+		return &Header{Key: "", Value: []string{""}}
+	}
+}

pkg/types/header_test.go

@@ -0,0 +1,277 @@
+package types
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestHeaders_Has(t *testing.T) {
+	t.Run("Has returns true for existing header", func(t *testing.T) {
+		headers := Headers{
+			{Key: "Content-Type", Value: []string{"application/json"}},
+			{Key: "Authorization", Value: []string{"Bearer token"}},
+		}
+
+		assert.True(t, headers.Has("Content-Type"))
+		assert.True(t, headers.Has("Authorization"))
+	})
+
+	t.Run("Has returns false for non-existent header", func(t *testing.T) {
+		headers := Headers{
+			{Key: "Content-Type", Value: []string{"application/json"}},
+		}
+
+		assert.False(t, headers.Has("Authorization"))
+		assert.False(t, headers.Has("X-Custom-Header"))
+	})
+
+	t.Run("Has with empty headers", func(t *testing.T) {
+		headers := Headers{}
+
+		assert.False(t, headers.Has("Any-Header"))
+	})
+
+	t.Run("Has is case sensitive", func(t *testing.T) {
+		headers := Headers{
+			{Key: "Content-Type", Value: []string{"text/html"}},
+		}
+
+		assert.True(t, headers.Has("Content-Type"))
+		assert.False(t, headers.Has("content-type"))
+		assert.False(t, headers.Has("CONTENT-TYPE"))
+	})
+}
+
+func TestHeaders_GetValue(t *testing.T) {
+	t.Run("GetValue returns existing header value", func(t *testing.T) {
+		headers := Headers{
+			{Key: "Content-Type", Value: []string{"application/json"}},
+			{Key: "Accept", Value: []string{"text/html"}},
+		}
+
+		value := headers.GetValue("Content-Type")
+		require.NotNil(t, value)
+		assert.Equal(t, []string{"application/json"}, *value)
+	})
+
+	t.Run("GetValue returns nil for non-existent header", func(t *testing.T) {
+		headers := Headers{
+			{Key: "Content-Type", Value: []string{"application/json"}},
+		}
+
+		value := headers.GetValue("Authorization")
+		assert.Nil(t, value)
+	})
+
+	t.Run("GetValue with empty headers", func(t *testing.T) {
+		headers := Headers{}
+
+		value := headers.GetValue("Any-Header")
+		assert.Nil(t, value)
+	})
+
+	t.Run("GetValue with multiple values", func(t *testing.T) {
+		headers := Headers{
+			{Key: "Accept", Value: []string{"text/html", "application/xml", "application/json"}},
+		}
+
+		value := headers.GetValue("Accept")
+		require.NotNil(t, value)
+		assert.Equal(t, []string{"text/html", "application/xml", "application/json"}, *value)
+	})
+
+	t.Run("GetValue is case sensitive", func(t *testing.T) {
+		headers := Headers{
+			{Key: "X-Custom-Header", Value: []string{"value"}},
+		}
+
+		value1 := headers.GetValue("X-Custom-Header")
+		require.NotNil(t, value1)
+		assert.Equal(t, []string{"value"}, *value1)
+
+		value2 := headers.GetValue("x-custom-header")
+		assert.Nil(t, value2)
+	})
+}
+
+func TestHeaders_Append(t *testing.T) {
+	t.Run("Append new header", func(t *testing.T) {
+		headers := &Headers{}
+		headers.Append(Header{Key: "Content-Type", Value: []string{"application/json"}})
+
+		assert.Len(t, *headers, 1)
+		assert.Equal(t, "Content-Type", (*headers)[0].Key)
+		assert.Equal(t, []string{"application/json"}, (*headers)[0].Value)
+	})
+
+	t.Run("Append to existing header key", func(t *testing.T) {
+		headers := &Headers{
+			{Key: "Accept", Value: []string{"text/html"}},
+		}
+		headers.Append(Header{Key: "Accept", Value: []string{"application/json"}})
+
+		assert.Len(t, *headers, 1)
+		assert.Equal(t, []string{"text/html", "application/json"}, (*headers)[0].Value)
+	})
+
+	t.Run("Append different headers", func(t *testing.T) {
+		headers := &Headers{}
+		headers.Append(Header{Key: "Content-Type", Value: []string{"application/json"}})
+		headers.Append(Header{Key: "Authorization", Value: []string{"Bearer token"}})
+		headers.Append(Header{Key: "Accept", Value: []string{"*/*"}})
+
+		assert.Len(t, *headers, 3)
+	})
+
+	t.Run("Append multiple values at once", func(t *testing.T) {
+		headers := &Headers{
+			{Key: "Accept-Language", Value: []string{"en"}},
+		}
+		headers.Append(Header{Key: "Accept-Language", Value: []string{"fr", "de"}})
+
+		assert.Len(t, *headers, 1)
+		assert.Equal(t, []string{"en", "fr", "de"}, (*headers)[0].Value)
+	})
+
+	t.Run("Append empty value", func(t *testing.T) {
+		headers := &Headers{}
+		headers.Append(Header{Key: "Empty-Header", Value: []string{""}})
+
+		assert.Len(t, *headers, 1)
+		assert.Equal(t, []string{""}, (*headers)[0].Value)
+	})
+}
+
+func TestHeaders_Parse(t *testing.T) {
+	t.Run("Parse single header", func(t *testing.T) {
+		headers := &Headers{}
+		headers.Parse("Content-Type: application/json")
+
+		assert.Len(t, *headers, 1)
+		assert.Equal(t, "Content-Type", (*headers)[0].Key)
+		assert.Equal(t, []string{"application/json"}, (*headers)[0].Value)
+	})
+
+	t.Run("Parse multiple headers", func(t *testing.T) {
+		headers := &Headers{}
+		headers.Parse("Content-Type: application/json", "Authorization: Bearer token", "Accept: */*")
+
+		assert.Len(t, *headers, 3)
+		assert.Equal(t, "Content-Type", (*headers)[0].Key)
+		assert.Equal(t, "Authorization", (*headers)[1].Key)
+		assert.Equal(t, "Accept", (*headers)[2].Key)
+	})
+
+	t.Run("Parse headers with same key", func(t *testing.T) {
+		headers := &Headers{}
+		headers.Parse("Accept: text/html", "Accept: application/json", "Accept: application/xml")
+
+		assert.Len(t, *headers, 1)
+		assert.Equal(t, []string{"text/html", "application/json", "application/xml"}, (*headers)[0].Value)
+	})
+
+	t.Run("Parse header without value", func(t *testing.T) {
+		headers := &Headers{}
+		headers.Parse("X-Empty-Header")
+
+		assert.Len(t, *headers, 1)
+		assert.Equal(t, "X-Empty-Header", (*headers)[0].Key)
+		assert.Equal(t, []string{""}, (*headers)[0].Value)
+	})
+
+	t.Run("Parse header with empty value", func(t *testing.T) {
+		headers := &Headers{}
+		headers.Parse("X-Empty: ")
+
+		assert.Len(t, *headers, 1)
+		assert.Equal(t, "X-Empty", (*headers)[0].Key)
+		assert.Equal(t, []string{""}, (*headers)[0].Value)
+	})
+
+	t.Run("Parse header with multiple colons", func(t *testing.T) {
+		headers := &Headers{}
+		headers.Parse("X-Time: 12:34:56")
+
+		assert.Len(t, *headers, 1)
+		assert.Equal(t, "X-Time", (*headers)[0].Key)
+		assert.Equal(t, []string{"12:34:56"}, (*headers)[0].Value)
+	})
+
+	t.Run("Parse no arguments", func(t *testing.T) {
+		headers := &Headers{}
+		headers.Parse()
+
+		assert.Empty(t, *headers)
+	})
+
+	t.Run("Parse with existing headers", func(t *testing.T) {
+		headers := &Headers{
+			{Key: "Existing", Value: []string{"value"}},
+		}
+		headers.Parse("New: header")
+
+		assert.Len(t, *headers, 2)
+		assert.Equal(t, "Existing", (*headers)[0].Key)
+		assert.Equal(t, "New", (*headers)[1].Key)
+	})
+}
+
+func TestParseHeader(t *testing.T) {
+	t.Run("ParseHeader with key and value", func(t *testing.T) {
+		header := ParseHeader("Content-Type: application/json")
+		require.NotNil(t, header)
+		assert.Equal(t, "Content-Type", header.Key)
+		assert.Equal(t, []string{"application/json"}, header.Value)
+	})
+
+	t.Run("ParseHeader with only key", func(t *testing.T) {
+		header := ParseHeader("X-Header")
+		require.NotNil(t, header)
+		assert.Equal(t, "X-Header", header.Key)
+		assert.Equal(t, []string{""}, header.Value)
+	})
+
+	t.Run("ParseHeader with empty value", func(t *testing.T) {
+		header := ParseHeader("Key: ")
+		require.NotNil(t, header)
+		assert.Equal(t, "Key", header.Key)
+		assert.Equal(t, []string{""}, header.Value)
+	})
+
+	t.Run("ParseHeader with multiple colons", func(t *testing.T) {
+		header := ParseHeader("X-URL: https://example.com:8080/path")
+		require.NotNil(t, header)
+		assert.Equal(t, "X-URL", header.Key)
+		assert.Equal(t, []string{"https://example.com:8080/path"}, header.Value)
+	})
+
+	t.Run("ParseHeader with empty string", func(t *testing.T) {
+		header := ParseHeader("")
+		require.NotNil(t, header)
+		assert.Empty(t, header.Key)
+		assert.Equal(t, []string{""}, header.Value)
+	})
+
+	t.Run("ParseHeader with spaces in value", func(t *testing.T) {
+		header := ParseHeader("User-Agent: Mozilla/5.0 (Windows NT 10.0)")
+		require.NotNil(t, header)
+		assert.Equal(t, "User-Agent", header.Key)
+		assert.Equal(t, []string{"Mozilla/5.0 (Windows NT 10.0)"}, header.Value)
+	})
+
+	t.Run("ParseHeader without colon-space separator", func(t *testing.T) {
+		header := ParseHeader("Content-Type:application/json")
+		require.NotNil(t, header)
+		assert.Equal(t, "Content-Type:application/json", header.Key)
+		assert.Equal(t, []string{""}, header.Value)
+	})
+
+	t.Run("ParseHeader with trailing spaces", func(t *testing.T) {
+		header := ParseHeader("Header: value with spaces   ")
+		require.NotNil(t, header)
+		assert.Equal(t, "Header", header.Key)
+		assert.Equal(t, []string{"value with spaces   "}, header.Value)
+	})
+}

pkg/types/key_value.go

@@ -0,0 +1,6 @@
+package types
+
+type KeyValue[K comparable, V any] struct {
+	Key   K
+	Value V
+}

pkg/types/param.go

@@ -0,0 +1,42 @@
+package types
+
+import "strings"
+
+type Param KeyValue[string, []string]
+
+type Params []Param
+
+func (params Params) GetValue(key string) *[]string {
+	for i := range params {
+		if params[i].Key == key {
+			return &params[i].Value
+		}
+	}
+	return nil
+}
+
+func (params *Params) Append(param Param) {
+	if item := params.GetValue(param.Key); item != nil {
+		*item = append(*item, param.Value...)
+	} else {
+		*params = append(*params, param)
+	}
+}
+
+func (params *Params) Parse(rawValues ...string) {
+	for _, rawValue := range rawValues {
+		params.Append(*ParseParam(rawValue))
+	}
+}
+
+func ParseParam(rawValue string) *Param {
+	parts := strings.SplitN(rawValue, "=", 2)
+	switch len(parts) {
+	case 1:
+		return &Param{Key: parts[0], Value: []string{""}}
+	case 2:
+		return &Param{Key: parts[0], Value: []string{parts[1]}}
+	default:
+		return &Param{Key: "", Value: []string{""}}
+	}
+}

pkg/types/param_test.go

@@ -0,0 +1,281 @@
+package types
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParams_GetValue(t *testing.T) {
+	t.Run("GetValue returns existing parameter value", func(t *testing.T) {
+		params := Params{
+			{Key: "name", Value: []string{"john"}},
+			{Key: "age", Value: []string{"25"}},
+		}
+
+		value := params.GetValue("name")
+		require.NotNil(t, value)
+		assert.Equal(t, []string{"john"}, *value)
+	})
+
+	t.Run("GetValue returns nil for non-existent parameter", func(t *testing.T) {
+		params := Params{
+			{Key: "name", Value: []string{"john"}},
+		}
+
+		value := params.GetValue("nonexistent")
+		assert.Nil(t, value)
+	})
+
+	t.Run("GetValue with empty params", func(t *testing.T) {
+		params := Params{}
+
+		value := params.GetValue("any")
+		assert.Nil(t, value)
+	})
+
+	t.Run("GetValue with multiple values", func(t *testing.T) {
+		params := Params{
+			{Key: "tags", Value: []string{"go", "test", "api"}},
+		}
+
+		value := params.GetValue("tags")
+		require.NotNil(t, value)
+		assert.Equal(t, []string{"go", "test", "api"}, *value)
+	})
+
+	t.Run("GetValue case sensitive", func(t *testing.T) {
+		params := Params{
+			{Key: "Name", Value: []string{"value"}},
+		}
+
+		value1 := params.GetValue("Name")
+		require.NotNil(t, value1)
+		assert.Equal(t, []string{"value"}, *value1)
+
+		value2 := params.GetValue("name")
+		assert.Nil(t, value2)
+	})
+}
+
+func TestParams_Append(t *testing.T) {
+	t.Run("Append new parameter", func(t *testing.T) {
+		params := &Params{}
+		params.Append(Param{Key: "name", Value: []string{"john"}})
+
+		assert.Len(t, *params, 1)
+		assert.Equal(t, "name", (*params)[0].Key)
+		assert.Equal(t, []string{"john"}, (*params)[0].Value)
+	})
+
+	t.Run("Append to existing parameter key", func(t *testing.T) {
+		params := &Params{
+			{Key: "tags", Value: []string{"go"}},
+		}
+		params.Append(Param{Key: "tags", Value: []string{"test"}})
+
+		assert.Len(t, *params, 1)
+		assert.Equal(t, []string{"go", "test"}, (*params)[0].Value)
+	})
+
+	t.Run("Append different parameters", func(t *testing.T) {
+		params := &Params{}
+		params.Append(Param{Key: "name", Value: []string{"john"}})
+		params.Append(Param{Key: "age", Value: []string{"25"}})
+		params.Append(Param{Key: "city", Value: []string{"NYC"}})
+
+		assert.Len(t, *params, 3)
+	})
+
+	t.Run("Append multiple values at once", func(t *testing.T) {
+		params := &Params{
+			{Key: "colors", Value: []string{"red"}},
+		}
+		params.Append(Param{Key: "colors", Value: []string{"blue", "green"}})
+
+		assert.Len(t, *params, 1)
+		assert.Equal(t, []string{"red", "blue", "green"}, (*params)[0].Value)
+	})
+
+	t.Run("Append empty value", func(t *testing.T) {
+		params := &Params{}
+		params.Append(Param{Key: "empty", Value: []string{""}})
+
+		assert.Len(t, *params, 1)
+		assert.Equal(t, []string{""}, (*params)[0].Value)
+	})
+}
+
+func TestParams_Parse(t *testing.T) {
+	t.Run("Parse single parameter", func(t *testing.T) {
+		params := &Params{}
+		params.Parse("name=john")
+
+		assert.Len(t, *params, 1)
+		assert.Equal(t, "name", (*params)[0].Key)
+		assert.Equal(t, []string{"john"}, (*params)[0].Value)
+	})
+
+	t.Run("Parse multiple parameters", func(t *testing.T) {
+		params := &Params{}
+		params.Parse("name=john", "age=25", "city=NYC")
+
+		assert.Len(t, *params, 3)
+		assert.Equal(t, "name", (*params)[0].Key)
+		assert.Equal(t, "age", (*params)[1].Key)
+		assert.Equal(t, "city", (*params)[2].Key)
+	})
+
+	t.Run("Parse parameters with same key", func(t *testing.T) {
+		params := &Params{}
+		params.Parse("filter=name", "filter=age", "filter=city")
+
+		assert.Len(t, *params, 1)
+		assert.Equal(t, []string{"name", "age", "city"}, (*params)[0].Value)
+	})
+
+	t.Run("Parse parameter without value", func(t *testing.T) {
+		params := &Params{}
+		params.Parse("debug")
+
+		assert.Len(t, *params, 1)
+		assert.Equal(t, "debug", (*params)[0].Key)
+		assert.Equal(t, []string{""}, (*params)[0].Value)
+	})
+
+	t.Run("Parse parameter with empty value", func(t *testing.T) {
+		params := &Params{}
+		params.Parse("empty=")
+
+		assert.Len(t, *params, 1)
+		assert.Equal(t, "empty", (*params)[0].Key)
+		assert.Equal(t, []string{""}, (*params)[0].Value)
+	})
+
+	t.Run("Parse parameter with multiple equals", func(t *testing.T) {
+		params := &Params{}
+		params.Parse("equation=x=y+z")
+
+		assert.Len(t, *params, 1)
+		assert.Equal(t, "equation", (*params)[0].Key)
+		assert.Equal(t, []string{"x=y+z"}, (*params)[0].Value)
+	})
+
+	t.Run("Parse no arguments", func(t *testing.T) {
+		params := &Params{}
+		params.Parse()
+
+		assert.Empty(t, *params)
+	})
+
+	t.Run("Parse with existing parameters", func(t *testing.T) {
+		params := &Params{
+			{Key: "existing", Value: []string{"value"}},
+		}
+		params.Parse("new=param")
+
+		assert.Len(t, *params, 2)
+		assert.Equal(t, "existing", (*params)[0].Key)
+		assert.Equal(t, "new", (*params)[1].Key)
+	})
+
+	t.Run("Parse URL-encoded values", func(t *testing.T) {
+		params := &Params{}
+		params.Parse("query=hello%20world", "special=%21%40%23")
+
+		assert.Len(t, *params, 2)
+		assert.Equal(t, []string{"hello%20world"}, (*params)[0].Value)
+		assert.Equal(t, []string{"%21%40%23"}, (*params)[1].Value)
+	})
+}
+
+func TestParseParam(t *testing.T) {
+	t.Run("ParseParam with key and value", func(t *testing.T) {
+		param := ParseParam("name=john")
+		require.NotNil(t, param)
+		assert.Equal(t, "name", param.Key)
+		assert.Equal(t, []string{"john"}, param.Value)
+	})
+
+	t.Run("ParseParam with only key", func(t *testing.T) {
+		param := ParseParam("debug")
+		require.NotNil(t, param)
+		assert.Equal(t, "debug", param.Key)
+		assert.Equal(t, []string{""}, param.Value)
+	})
+
+	t.Run("ParseParam with empty value", func(t *testing.T) {
+		param := ParseParam("key=")
+		require.NotNil(t, param)
+		assert.Equal(t, "key", param.Key)
+		assert.Equal(t, []string{""}, param.Value)
+	})
+
+	t.Run("ParseParam with multiple equals", func(t *testing.T) {
+		param := ParseParam("data=key=value=test")
+		require.NotNil(t, param)
+		assert.Equal(t, "data", param.Key)
+		assert.Equal(t, []string{"key=value=test"}, param.Value)
+	})
+
+	t.Run("ParseParam with empty string", func(t *testing.T) {
+		param := ParseParam("")
+		require.NotNil(t, param)
+		assert.Empty(t, param.Key)
+		assert.Equal(t, []string{""}, param.Value)
+	})
+
+	t.Run("ParseParam with spaces", func(t *testing.T) {
+		param := ParseParam("key with spaces=value with spaces")
+		require.NotNil(t, param)
+		assert.Equal(t, "key with spaces", param.Key)
+		assert.Equal(t, []string{"value with spaces"}, param.Value)
+	})
+
+	t.Run("ParseParam with special characters", func(t *testing.T) {
+		param := ParseParam("key-._~=val!@#$%^&*()")
+		require.NotNil(t, param)
+		assert.Equal(t, "key-._~", param.Key)
+		assert.Equal(t, []string{"val!@#$%^&*()"}, param.Value)
+	})
+
+	t.Run("ParseParam with numeric values", func(t *testing.T) {
+		param := ParseParam("count=42")
+		require.NotNil(t, param)
+		assert.Equal(t, "count", param.Key)
+		assert.Equal(t, []string{"42"}, param.Value)
+	})
+
+	t.Run("ParseParam with boolean-like values", func(t *testing.T) {
+		testCases := []struct {
+			input    string
+			expected string
+		}{
+			{"active=true", "true"},
+			{"enabled=false", "false"},
+			{"visible=1", "1"},
+			{"hidden=0", "0"},
+		}
+
+		for _, testCase := range testCases {
+			param := ParseParam(testCase.input)
+			require.NotNil(t, param)
+			assert.Equal(t, []string{testCase.expected}, param.Value)
+		}
+	})
+
+	t.Run("ParseParam with URL-encoded value", func(t *testing.T) {
+		param := ParseParam("message=hello%20world")
+		require.NotNil(t, param)
+		assert.Equal(t, "message", param.Key)
+		assert.Equal(t, []string{"hello%20world"}, param.Value)
+	})
+
+	t.Run("ParseParam with JSON-like value", func(t *testing.T) {
+		param := ParseParam(`data={"key":"value"}`)
+		require.NotNil(t, param)
+		assert.Equal(t, "data", param.Key)
+		assert.Equal(t, []string{`{"key":"value"}`}, param.Value)
+	})
+}

pkg/types/proxy.go

@@ -0,0 +1,38 @@
+package types
+
+import (
+	"fmt"
+	"net/url"
+)
+
+type Proxy url.URL
+
+func (proxy Proxy) String() string {
+	return (*url.URL)(&proxy).String()
+}
+
+type Proxies []Proxy
+
+func (proxies *Proxies) Append(proxy Proxy) {
+	*proxies = append(*proxies, proxy)
+}
+
+func (proxies *Proxies) Parse(rawValue string) error {
+	parsedProxy, err := ParseProxy(rawValue)
+	if err != nil {
+		return err
+	}
+
+	proxies.Append(*parsedProxy)
+	return nil
+}
+
+func ParseProxy(rawValue string) (*Proxy, error) {
+	urlParsed, err := url.Parse(rawValue)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse proxy URL: %w", err)
+	}
+
+	proxyParsed := Proxy(*urlParsed)
+	return &proxyParsed, nil
+}

pkg/types/proxy_test.go

@@ -0,0 +1,285 @@
+package types
+
+import (
+	"net/url"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestProxy_String(t *testing.T) {
+	t.Run("Proxy String returns correct URL", func(t *testing.T) {
+		u, err := url.Parse("http://proxy.example.com:8080")
+		require.NoError(t, err)
+
+		proxy := Proxy(*u)
+		assert.Equal(t, "http://proxy.example.com:8080", proxy.String())
+	})
+
+	t.Run("Proxy String with HTTPS", func(t *testing.T) {
+		u, err := url.Parse("https://secure-proxy.example.com:443")
+		require.NoError(t, err)
+
+		proxy := Proxy(*u)
+		assert.Equal(t, "https://secure-proxy.example.com:443", proxy.String())
+	})
+
+	t.Run("Proxy String with authentication", func(t *testing.T) {
+		u, err := url.Parse("http://user:pass@proxy.example.com:8080")
+		require.NoError(t, err)
+
+		proxy := Proxy(*u)
+		assert.Equal(t, "http://user:pass@proxy.example.com:8080", proxy.String())
+	})
+
+	t.Run("Proxy String with path", func(t *testing.T) {
+		u, err := url.Parse("http://proxy.example.com:8080/proxy/path")
+		require.NoError(t, err)
+
+		proxy := Proxy(*u)
+		assert.Equal(t, "http://proxy.example.com:8080/proxy/path", proxy.String())
+	})
+
+	t.Run("Proxy String with query params", func(t *testing.T) {
+		u, err := url.Parse("http://proxy.example.com:8080/?timeout=30&retry=3")
+		require.NoError(t, err)
+
+		proxy := Proxy(*u)
+		assert.Equal(t, "http://proxy.example.com:8080/?timeout=30&retry=3", proxy.String())
+	})
+}
+
+func TestProxies_Append(t *testing.T) {
+	t.Run("Append single proxy", func(t *testing.T) {
+		proxies := &Proxies{}
+		u, err := url.Parse("http://proxy1.example.com:8080")
+		require.NoError(t, err)
+
+		proxy := Proxy(*u)
+		proxies.Append(proxy)
+
+		assert.Len(t, *proxies, 1)
+		assert.Equal(t, "http://proxy1.example.com:8080", (*proxies)[0].String())
+	})
+
+	t.Run("Append multiple proxies", func(t *testing.T) {
+		proxies := &Proxies{}
+
+		url1, err := url.Parse("http://proxy1.example.com:8080")
+		require.NoError(t, err)
+		url2, err := url.Parse("http://proxy2.example.com:8081")
+		require.NoError(t, err)
+		url3, err := url.Parse("https://proxy3.example.com:443")
+		require.NoError(t, err)
+
+		proxies.Append(Proxy(*url1))
+		proxies.Append(Proxy(*url2))
+		proxies.Append(Proxy(*url3))
+
+		assert.Len(t, *proxies, 3)
+		assert.Equal(t, "http://proxy1.example.com:8080", (*proxies)[0].String())
+		assert.Equal(t, "http://proxy2.example.com:8081", (*proxies)[1].String())
+		assert.Equal(t, "https://proxy3.example.com:443", (*proxies)[2].String())
+	})
+
+	t.Run("Append to existing proxies", func(t *testing.T) {
+		existingURL, err := url.Parse("http://existing.example.com:8080")
+		require.NoError(t, err)
+
+		proxies := &Proxies{Proxy(*existingURL)}
+
+		newURL, err := url.Parse("http://new.example.com:8081")
+		require.NoError(t, err)
+
+		proxies.Append(Proxy(*newURL))
+
+		assert.Len(t, *proxies, 2)
+		assert.Equal(t, "http://existing.example.com:8080", (*proxies)[0].String())
+		assert.Equal(t, "http://new.example.com:8081", (*proxies)[1].String())
+	})
+}
+
+func TestProxies_Parse(t *testing.T) {
+	t.Run("Parse valid proxy URL", func(t *testing.T) {
+		proxies := &Proxies{}
+		err := proxies.Parse("http://proxy.example.com:8080")
+
+		require.NoError(t, err)
+		assert.Len(t, *proxies, 1)
+		assert.Equal(t, "http://proxy.example.com:8080", (*proxies)[0].String())
+	})
+
+	t.Run("Parse HTTPS proxy URL", func(t *testing.T) {
+		proxies := &Proxies{}
+		err := proxies.Parse("https://secure-proxy.example.com:443")
+
+		require.NoError(t, err)
+		assert.Len(t, *proxies, 1)
+		assert.Equal(t, "https://secure-proxy.example.com:443", (*proxies)[0].String())
+	})
+
+	t.Run("Parse proxy URL with authentication", func(t *testing.T) {
+		proxies := &Proxies{}
+		err := proxies.Parse("http://user:pass@proxy.example.com:8080")
+
+		require.NoError(t, err)
+		assert.Len(t, *proxies, 1)
+		assert.Equal(t, "http://user:pass@proxy.example.com:8080", (*proxies)[0].String())
+	})
+
+	t.Run("Parse invalid proxy URL", func(t *testing.T) {
+		proxies := &Proxies{}
+		err := proxies.Parse("://invalid-url")
+
+		require.Error(t, err)
+		assert.Contains(t, err.Error(), "failed to parse proxy URL")
+		assert.Empty(t, *proxies)
+	})
+
+	t.Run("Parse empty string", func(t *testing.T) {
+		proxies := &Proxies{}
+		err := proxies.Parse("")
+
+		require.NoError(t, err)
+		assert.Len(t, *proxies, 1)
+		assert.Empty(t, (*proxies)[0].String())
+	})
+
+	t.Run("Parse to existing proxies", func(t *testing.T) {
+		existingURL, err := url.Parse("http://existing.example.com:8080")
+		require.NoError(t, err)
+
+		proxies := &Proxies{Proxy(*existingURL)}
+		err = proxies.Parse("http://new.example.com:8081")
+
+		require.NoError(t, err)
+		assert.Len(t, *proxies, 2)
+		assert.Equal(t, "http://existing.example.com:8080", (*proxies)[0].String())
+		assert.Equal(t, "http://new.example.com:8081", (*proxies)[1].String())
+	})
+
+	t.Run("Parse proxy with special characters", func(t *testing.T) {
+		proxies := &Proxies{}
+		err := proxies.Parse("http://proxy.example.com:8080/path?param=value&other=test")
+
+		require.NoError(t, err)
+		assert.Len(t, *proxies, 1)
+		assert.Equal(t, "http://proxy.example.com:8080/path?param=value&other=test", (*proxies)[0].String())
+	})
+}
+
+func TestParseProxy(t *testing.T) {
+	t.Run("ParseProxy with valid HTTP URL", func(t *testing.T) {
+		proxy, err := ParseProxy("http://proxy.example.com:8080")
+
+		require.NoError(t, err)
+		require.NotNil(t, proxy)
+		assert.Equal(t, "http://proxy.example.com:8080", proxy.String())
+	})
+
+	t.Run("ParseProxy with valid HTTPS URL", func(t *testing.T) {
+		proxy, err := ParseProxy("https://secure-proxy.example.com:443")
+
+		require.NoError(t, err)
+		require.NotNil(t, proxy)
+		assert.Equal(t, "https://secure-proxy.example.com:443", proxy.String())
+	})
+
+	t.Run("ParseProxy with authentication", func(t *testing.T) {
+		proxy, err := ParseProxy("http://user:password@proxy.example.com:8080")
+
+		require.NoError(t, err)
+		require.NotNil(t, proxy)
+		assert.Equal(t, "http://user:password@proxy.example.com:8080", proxy.String())
+	})
+
+	t.Run("ParseProxy with path", func(t *testing.T) {
+		proxy, err := ParseProxy("http://proxy.example.com:8080/proxy/endpoint")
+
+		require.NoError(t, err)
+		require.NotNil(t, proxy)
+		assert.Equal(t, "http://proxy.example.com:8080/proxy/endpoint", proxy.String())
+	})
+
+	t.Run("ParseProxy with query parameters", func(t *testing.T) {
+		proxy, err := ParseProxy("http://proxy.example.com:8080/?timeout=30&retry=3")
+
+		require.NoError(t, err)
+		require.NotNil(t, proxy)
+		assert.Equal(t, "http://proxy.example.com:8080/?timeout=30&retry=3", proxy.String())
+	})
+
+	t.Run("ParseProxy with malformed URL", func(t *testing.T) {
+		proxy, err := ParseProxy("://malformed-url")
+
+		require.Error(t, err)
+		assert.Nil(t, proxy)
+		assert.Contains(t, err.Error(), "failed to parse proxy URL")
+	})
+
+	t.Run("ParseProxy with empty string", func(t *testing.T) {
+		proxy, err := ParseProxy("")
+
+		require.NoError(t, err)
+		require.NotNil(t, proxy)
+		assert.Empty(t, proxy.String())
+	})
+
+	t.Run("ParseProxy with localhost", func(t *testing.T) {
+		proxy, err := ParseProxy("http://localhost:3128")
+
+		require.NoError(t, err)
+		require.NotNil(t, proxy)
+		assert.Equal(t, "http://localhost:3128", proxy.String())
+	})
+
+	t.Run("ParseProxy with IP address", func(t *testing.T) {
+		proxy, err := ParseProxy("http://192.168.1.100:8080")
+
+		require.NoError(t, err)
+		require.NotNil(t, proxy)
+		assert.Equal(t, "http://192.168.1.100:8080", proxy.String())
+	})
+
+	t.Run("ParseProxy without scheme", func(t *testing.T) {
+		proxy, err := ParseProxy("proxy.example.com:8080")
+
+		require.NoError(t, err)
+		require.NotNil(t, proxy)
+		assert.Equal(t, "proxy.example.com:8080", proxy.String())
+	})
+
+	t.Run("ParseProxy with SOCKS protocol", func(t *testing.T) {
+		proxy, err := ParseProxy("socks5://proxy.example.com:1080")
+
+		require.NoError(t, err)
+		require.NotNil(t, proxy)
+		assert.Equal(t, "socks5://proxy.example.com:1080", proxy.String())
+	})
+
+	t.Run("ParseProxy preserves URL components", func(t *testing.T) {
+		rawURL := "http://user:pass@proxy.example.com:8080/path?param=value#fragment"
+		proxy, err := ParseProxy(rawURL)
+
+		require.NoError(t, err)
+		require.NotNil(t, proxy)
+		assert.Equal(t, rawURL, proxy.String())
+	})
+
+	t.Run("ParseProxy with percent encoding", func(t *testing.T) {
+		proxy, err := ParseProxy("http://proxy.example.com:8080/path%20with%20spaces")
+
+		require.NoError(t, err)
+		require.NotNil(t, proxy)
+		assert.Equal(t, "http://proxy.example.com:8080/path%20with%20spaces", proxy.String())
+	})
+
+	t.Run("ParseProxy error message format", func(t *testing.T) {
+		_, err := ParseProxy("http://[invalid-ipv6")
+
+		require.Error(t, err)
+		assert.Contains(t, err.Error(), "failed to parse proxy URL:")
+		assert.Contains(t, err.Error(), "missing ']' in host")
+	})
+}

pkg/utils/convert.go

@@ -0,0 +1,5 @@
+package utils
+
+func ToPtr[T any](value T) *T {
+	return &value
+}

pkg/utils/convert_test.go

@@ -0,0 +1,155 @@
+package utils
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestToPtr(t *testing.T) {
+	t.Run("ToPtr with int", func(t *testing.T) {
+		value := 42
+		ptr := ToPtr(value)
+
+		require.NotNil(t, ptr)
+		assert.Equal(t, value, *ptr)
+		assert.NotSame(t, &value, ptr, "Should return a new pointer")
+	})
+
+	t.Run("ToPtr with string", func(t *testing.T) {
+		value := "test string"
+		ptr := ToPtr(value)
+
+		require.NotNil(t, ptr)
+		assert.Equal(t, value, *ptr)
+	})
+
+	t.Run("ToPtr with bool", func(t *testing.T) {
+		value := true
+		ptr := ToPtr(value)
+
+		require.NotNil(t, ptr)
+		assert.Equal(t, value, *ptr)
+	})
+
+	t.Run("ToPtr with float64", func(t *testing.T) {
+		value := 3.14159
+		ptr := ToPtr(value)
+
+		require.NotNil(t, ptr)
+		assert.InEpsilon(t, value, *ptr, 0.0001)
+	})
+
+	t.Run("ToPtr with struct", func(t *testing.T) {
+		type TestStruct struct {
+			Field1 string
+			Field2 int
+		}
+
+		value := TestStruct{Field1: "test", Field2: 123}
+		ptr := ToPtr(value)
+
+		require.NotNil(t, ptr)
+		assert.Equal(t, value, *ptr)
+		assert.Equal(t, "test", ptr.Field1)
+		assert.Equal(t, 123, ptr.Field2)
+	})
+
+	t.Run("ToPtr with slice", func(t *testing.T) {
+		value := []int{1, 2, 3}
+		ptr := ToPtr(value)
+
+		require.NotNil(t, ptr)
+		assert.Equal(t, value, *ptr)
+		assert.Len(t, *ptr, 3)
+	})
+
+	t.Run("ToPtr with map", func(t *testing.T) {
+		value := map[string]int{"one": 1, "two": 2}
+		ptr := ToPtr(value)
+
+		require.NotNil(t, ptr)
+		assert.Equal(t, value, *ptr)
+		assert.Len(t, *ptr, 2)
+	})
+
+	t.Run("ToPtr with nil interface", func(t *testing.T) {
+		var value any = nil
+		ptr := ToPtr(value)
+
+		require.NotNil(t, ptr)
+		assert.Nil(t, *ptr)
+	})
+
+	t.Run("ToPtr with pointer", func(t *testing.T) {
+		originalValue := 42
+		originalPtr := &originalValue
+		ptr := ToPtr(originalPtr)
+
+		require.NotNil(t, ptr)
+		assert.Equal(t, originalPtr, *ptr)
+		assert.NotSame(t, originalPtr, ptr, "Should return a pointer to pointer")
+	})
+
+	t.Run("ToPtr with uint", func(t *testing.T) {
+		value := uint(100)
+		ptr := ToPtr(value)
+
+		require.NotNil(t, ptr)
+		assert.Equal(t, value, *ptr)
+	})
+
+	t.Run("ToPtr modification safety", func(t *testing.T) {
+		value := 10
+		ptr := ToPtr(value)
+
+		*ptr = 20
+		assert.Equal(t, 10, value, "Original value should not be modified")
+		assert.Equal(t, 20, *ptr, "Pointer value should be modified")
+	})
+
+	t.Run("ToPtr with byte array", func(t *testing.T) {
+		value := [3]byte{1, 2, 3}
+		ptr := ToPtr(value)
+
+		require.NotNil(t, ptr)
+		assert.Equal(t, value, *ptr)
+	})
+
+	t.Run("ToPtr with rune", func(t *testing.T) {
+		value := 'A'
+		ptr := ToPtr(value)
+
+		require.NotNil(t, ptr)
+		assert.Equal(t, value, *ptr)
+		assert.Equal(t, int32(65), *ptr)
+	})
+
+	t.Run("ToPtr with empty string", func(t *testing.T) {
+		value := ""
+		ptr := ToPtr(value)
+
+		require.NotNil(t, ptr)
+		assert.Equal(t, value, *ptr)
+		assert.Empty(t, *ptr)
+	})
+
+	t.Run("ToPtr with zero values", func(t *testing.T) {
+		// Test with various zero values
+		intZero := 0
+		intPtr := ToPtr(intZero)
+		require.NotNil(t, intPtr)
+		assert.Equal(t, 0, *intPtr)
+
+		boolZero := false
+		boolPtr := ToPtr(boolZero)
+		require.NotNil(t, boolPtr)
+		assert.False(t, *boolPtr)
+
+		floatZero := 0.0
+		floatPtr := ToPtr(floatZero)
+		require.NotNil(t, floatPtr)
+		assert.Equal(t, 0.0, *floatPtr) //nolint:testifylint
+	})
+}

pkg/utils/error.go

@@ -0,0 +1,105 @@
+package utils
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+)
+
+// ErrorHandler represents a function that handles a specific error type
+type ErrorHandler func(error) error
+
+// ErrorMatcher holds the error type/value and its handler
+type ErrorMatcher struct {
+	ErrorType  any // Can be error value (sentinel) or error type
+	Handler    ErrorHandler
+	IsSentinel bool // true for sentinel errors, false for custom types
+}
+
+// HandleError processes an error against a list of matchers and executes the appropriate handler.
+// It returns (true, handlerResult) if a matching handler is found and executed,
+// or (false, nil) if no matcher matches the error.
+// If err is nil, returns (true, nil).
+//
+// Example:
+//
+//	handled, result := HandleError(err,
+//	    OnSentinelError(io.EOF, func(e error) error {
+//	        return nil // EOF is expected, ignore it
+//	    }),
+//	    OnCustomError(func(e *CustomError) error {
+//	        return fmt.Errorf("custom error: %w", e)
+//	    }),
+//	)
+func HandleError(err error, matchers ...ErrorMatcher) (bool, error) {
+	if err == nil {
+		return true, nil
+	}
+
+	for _, matcher := range matchers {
+		if matcher.IsSentinel {
+			// Handle sentinel errors with errors.Is
+			if sentinelErr, ok := matcher.ErrorType.(error); ok {
+				if errors.Is(err, sentinelErr) {
+					return true, matcher.Handler(err)
+				}
+			}
+		} else {
+			// Handle custom error types with errors.As
+			errorType := reflect.TypeOf(matcher.ErrorType)
+			errorValue := reflect.New(errorType).Interface()
+
+			if errors.As(err, errorValue) {
+				return true, matcher.Handler(err)
+			}
+		}
+	}
+
+	return false, err // No matcher found
+}
+
+// HandleErrorOrDie processes an error against a list of matchers and executes the appropriate handler.
+// If a matching handler is found, it returns the handler's result.
+// If no matcher matches the error, it panics with a descriptive message.
+// This function is useful when all expected error types must be handled explicitly.
+//
+// Example:
+//
+//	result := HandleErrorOrDie(err,
+//	    OnSentinelError(context.Canceled, func(e error) error {
+//	        return fmt.Errorf("operation canceled")
+//	    }),
+//	    OnCustomError(func(e *ValidationError) error {
+//	        return fmt.Errorf("validation failed: %w", e)
+//	    }),
+//	) // Panics if err doesn't match any handler
+func HandleErrorOrDie(err error, matchers ...ErrorMatcher) error {
+	ok, err := HandleError(err, matchers...)
+	if !ok {
+		panic(fmt.Sprintf("Unhandled error of type %T: %v", err, err))
+	}
+	return err
+}
+
+func OnSentinelError(sentinelErr error, handler ErrorHandler) ErrorMatcher {
+	return ErrorMatcher{
+		ErrorType:  sentinelErr,
+		Handler:    handler,
+		IsSentinel: true,
+	}
+}
+
+func OnCustomError[T error](handler func(T) error) ErrorMatcher {
+	var zero T
+	return ErrorMatcher{
+		ErrorType: zero,
+		Handler: func(err error) error {
+			var typedErr T
+			if errors.As(err, &typedErr) {
+				return handler(typedErr)
+			}
+			return nil
+		},
+		IsSentinel: false,
+	}
+}

pkg/utils/error_test.go

@@ -0,0 +1,384 @@
+package utils
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// Custom error types for testing
+type CustomError struct {
+	Code    int
+	Message string
+}
+
+func (e CustomError) Error() string {
+	return fmt.Sprintf("custom error %d: %s", e.Code, e.Message)
+}
+
+type ValidationError struct {
+	Field string
+	Value string
+}
+
+func (e *ValidationError) Error() string {
+	return fmt.Sprintf("validation failed for field %s with value %s", e.Field, e.Value)
+}
+
+// Sentinel errors for testing
+var (
+	ErrSentinel1 = errors.New("sentinel error 1")
+	ErrSentinel2 = errors.New("sentinel error 2")
+)
+
+func TestHandleError(t *testing.T) {
+	t.Run("HandleError with nil error", func(t *testing.T) {
+		handled, result := HandleError(nil)
+		assert.True(t, handled)
+		assert.NoError(t, result)
+	})
+
+	t.Run("HandleError with sentinel error match", func(t *testing.T) {
+		err := io.EOF
+		handled, result := HandleError(err,
+			OnSentinelError(io.EOF, func(e error) error {
+				return errors.New("handled EOF")
+			}),
+		)
+		assert.True(t, handled)
+		assert.EqualError(t, result, "handled EOF")
+	})
+
+	t.Run("HandleError with wrapped sentinel error", func(t *testing.T) {
+		wrappedErr := fmt.Errorf("wrapped: %w", io.EOF)
+		handled, result := HandleError(wrappedErr,
+			OnSentinelError(io.EOF, func(e error) error {
+				return errors.New("handled wrapped EOF")
+			}),
+		)
+		assert.True(t, handled)
+		assert.EqualError(t, result, "handled wrapped EOF")
+	})
+
+	t.Run("HandleError with custom error type match", func(t *testing.T) {
+		err := &CustomError{Code: 404, Message: "not found"}
+		handled, result := HandleError(err,
+			OnCustomError(func(e *CustomError) error {
+				return fmt.Errorf("handled custom error with code %d", e.Code)
+			}),
+		)
+		assert.True(t, handled)
+		assert.EqualError(t, result, "handled custom error with code 404")
+	})
+
+	t.Run("HandleError with wrapped custom error", func(t *testing.T) {
+		customErr := &CustomError{Code: 500, Message: "internal error"}
+		wrappedErr := fmt.Errorf("wrapped: %w", customErr)
+
+		handled, result := HandleError(wrappedErr,
+			OnCustomError(func(e *CustomError) error {
+				return fmt.Errorf("handled wrapped custom error: %s", e.Message)
+			}),
+		)
+		assert.True(t, handled)
+		assert.EqualError(t, result, "handled wrapped custom error: internal error")
+	})
+
+	t.Run("HandleError with no matching handler", func(t *testing.T) {
+		err := errors.New("unhandled error")
+		handled, _ := HandleError(err,
+			OnSentinelError(io.EOF, func(e error) error {
+				return nil
+			}),
+			OnCustomError(func(e CustomError) error {
+				return nil
+			}),
+		)
+		assert.False(t, handled)
+	})
+
+	t.Run("HandleError with multiple matchers first match wins", func(t *testing.T) {
+		err := io.EOF
+		handled, result := HandleError(err,
+			OnSentinelError(io.EOF, func(e error) error {
+				return errors.New("first handler")
+			}),
+			OnSentinelError(io.EOF, func(e error) error {
+				return errors.New("second handler")
+			}),
+		)
+		assert.True(t, handled)
+		assert.EqualError(t, result, "first handler")
+	})
+
+	t.Run("HandleError with handler returning nil", func(t *testing.T) {
+		err := io.EOF
+		handled, result := HandleError(err,
+			OnSentinelError(io.EOF, func(e error) error {
+				return nil
+			}),
+		)
+		assert.True(t, handled)
+		assert.NoError(t, result)
+	})
+
+	t.Run("HandleError with multiple error types", func(t *testing.T) {
+		customErr := &CustomError{Code: 400, Message: "bad request"}
+		validationErr := &ValidationError{Field: "email", Value: "invalid"}
+
+		// Test CustomError handling
+		handled1, result1 := HandleError(customErr,
+			OnCustomError(func(e *CustomError) error {
+				return fmt.Errorf("custom: %d", e.Code)
+			}),
+			OnCustomError(func(e *ValidationError) error {
+				return fmt.Errorf("validation: %s", e.Field)
+			}),
+		)
+		assert.True(t, handled1)
+		require.EqualError(t, result1, "custom: 400")
+
+		// Test ValidationError handling
+		handled2, result2 := HandleError(validationErr,
+			OnCustomError(func(e *CustomError) error {
+				return fmt.Errorf("custom: %d", e.Code)
+			}),
+			OnCustomError(func(e *ValidationError) error {
+				return fmt.Errorf("validation: %s", e.Field)
+			}),
+		)
+		assert.True(t, handled2)
+		assert.EqualError(t, result2, "validation: email")
+	})
+
+	t.Run("HandleError with context errors", func(t *testing.T) {
+		// Test context.Canceled
+		handled1, result1 := HandleError(context.Canceled,
+			OnSentinelError(context.Canceled, func(e error) error {
+				return errors.New("operation canceled")
+			}),
+		)
+		assert.True(t, handled1)
+		require.EqualError(t, result1, "operation canceled")
+
+		// Test context.DeadlineExceeded
+		handled2, result2 := HandleError(context.DeadlineExceeded,
+			OnSentinelError(context.DeadlineExceeded, func(e error) error {
+				return errors.New("deadline exceeded")
+			}),
+		)
+		assert.True(t, handled2)
+		assert.EqualError(t, result2, "deadline exceeded")
+	})
+
+	t.Run("HandleError preserves original error in handler", func(t *testing.T) {
+		originalErr := &CustomError{Code: 403, Message: "forbidden"}
+		var capturedErr error
+
+		handled, _ := HandleError(originalErr,
+			OnCustomError(func(e *CustomError) error {
+				capturedErr = e
+				return nil
+			}),
+		)
+
+		assert.True(t, handled)
+		assert.Equal(t, originalErr, capturedErr)
+	})
+}
+
+func TestHandleErrorOrDie(t *testing.T) {
+	t.Run("HandleErrorOrDie with nil error", func(t *testing.T) {
+		result := HandleErrorOrDie(nil)
+		assert.NoError(t, result)
+	})
+
+	t.Run("HandleErrorOrDie with matched error", func(t *testing.T) {
+		err := io.EOF
+		result := HandleErrorOrDie(err,
+			OnSentinelError(io.EOF, func(e error) error {
+				return errors.New("handled EOF in die")
+			}),
+		)
+		assert.EqualError(t, result, "handled EOF in die")
+	})
+
+	t.Run("HandleErrorOrDie panics on unmatched error", func(t *testing.T) {
+		err := errors.New("unmatched error")
+
+		assert.Panics(t, func() {
+			HandleErrorOrDie(err,
+				OnSentinelError(io.EOF, func(e error) error {
+					return nil
+				}),
+			)
+		})
+	})
+
+	t.Run("HandleErrorOrDie with custom error panic", func(t *testing.T) {
+		customErr := &CustomError{Code: 500, Message: "server error"}
+
+		assert.Panics(t, func() {
+			HandleErrorOrDie(customErr,
+				OnCustomError(func(e *ValidationError) error {
+					return nil
+				}),
+			)
+		})
+	})
+
+	t.Run("HandleErrorOrDie with multiple matchers", func(t *testing.T) {
+		validationErr := &ValidationError{Field: "username", Value: ""}
+
+		result := HandleErrorOrDie(validationErr,
+			OnSentinelError(io.EOF, func(e error) error {
+				return errors.New("EOF handler")
+			}),
+			OnCustomError(func(e *CustomError) error {
+				return errors.New("custom handler")
+			}),
+			OnCustomError(func(e *ValidationError) error {
+				return fmt.Errorf("validation handler: field=%s", e.Field)
+			}),
+		)
+
+		assert.EqualError(t, result, "validation handler: field=username")
+	})
+}
+
+func TestOnSentinelError(t *testing.T) {
+	t.Run("OnSentinelError creates proper matcher", func(t *testing.T) {
+		handler := func(e error) error { return e }
+		matcher := OnSentinelError(io.EOF, handler)
+
+		assert.Equal(t, io.EOF, matcher.ErrorType)
+		assert.True(t, matcher.IsSentinel)
+		assert.NotNil(t, matcher.Handler)
+	})
+
+	t.Run("OnSentinelError with custom sentinel", func(t *testing.T) {
+		customSentinel := errors.New("custom sentinel")
+		callCount := 0
+
+		matcher := OnSentinelError(customSentinel, func(e error) error {
+			callCount++
+			return errors.New("handled custom sentinel")
+		})
+
+		// Test that it matches the sentinel
+		handled, result := HandleError(customSentinel, matcher)
+		assert.True(t, handled)
+		require.EqualError(t, result, "handled custom sentinel")
+		assert.Equal(t, 1, callCount)
+
+		// Test that it matches wrapped sentinel
+		wrappedErr := fmt.Errorf("wrapped: %w", customSentinel)
+		handled, result = HandleError(wrappedErr, matcher)
+		assert.True(t, handled)
+		require.EqualError(t, result, "handled custom sentinel")
+		assert.Equal(t, 2, callCount)
+	})
+}
+
+func TestOnCustomError(t *testing.T) {
+	t.Run("OnCustomError creates proper matcher", func(t *testing.T) {
+		matcher := OnCustomError(func(e *CustomError) error {
+			return fmt.Errorf("handled: %d", e.Code)
+		})
+
+		assert.False(t, matcher.IsSentinel)
+		assert.NotNil(t, matcher.Handler)
+
+		// Test the handler works
+		err := &CustomError{Code: 200, Message: "ok"}
+		result := matcher.Handler(err)
+		assert.EqualError(t, result, "handled: 200")
+	})
+
+	t.Run("OnCustomError with different error types", func(t *testing.T) {
+		// Create matchers for different types
+		customMatcher := OnCustomError(func(e *CustomError) error {
+			return fmt.Errorf("custom error: code=%d", e.Code)
+		})
+
+		validationMatcher := OnCustomError(func(e *ValidationError) error {
+			return fmt.Errorf("validation error: field=%s", e.Field)
+		})
+
+		// Test with CustomError
+		customErr := &CustomError{Code: 404, Message: "not found"}
+		handled, result := HandleError(customErr, customMatcher, validationMatcher)
+		assert.True(t, handled)
+		require.EqualError(t, result, "custom error: code=404")
+
+		// Test with ValidationError
+		validationErr := &ValidationError{Field: "age", Value: "-1"}
+		handled, result = HandleError(validationErr, customMatcher, validationMatcher)
+		assert.True(t, handled)
+		assert.EqualError(t, result, "validation error: field=age")
+	})
+
+	t.Run("OnCustomError handler receives correct type", func(t *testing.T) {
+		var receivedErr *CustomError
+
+		matcher := OnCustomError(func(e *CustomError) error {
+			receivedErr = e
+			return nil
+		})
+
+		originalErr := &CustomError{Code: 301, Message: "redirect"}
+		handled, _ := HandleError(originalErr, matcher)
+
+		assert.True(t, handled)
+		require.NotNil(t, receivedErr)
+		assert.Equal(t, 301, receivedErr.Code)
+		assert.Equal(t, "redirect", receivedErr.Message)
+	})
+}
+
+func TestErrorMatcherEdgeCases(t *testing.T) {
+	t.Run("Invalid sentinel error type in matcher", func(t *testing.T) {
+		// Create a matcher with invalid ErrorType for sentinel
+		matcher := ErrorMatcher{
+			ErrorType:  "not an error", // Invalid type
+			Handler:    func(e error) error { return e },
+			IsSentinel: true,
+		}
+
+		err := errors.New("test error")
+		handled, _ := HandleError(err, matcher)
+		assert.False(t, handled)
+	})
+
+	t.Run("Handler that panics", func(t *testing.T) {
+		matcher := OnSentinelError(io.EOF, func(e error) error {
+			panic("handler panic")
+		})
+
+		assert.Panics(t, func() {
+			HandleError(io.EOF, matcher)
+		})
+	})
+
+	t.Run("Complex error chain", func(t *testing.T) {
+		// Create a complex error chain
+		baseErr := &CustomError{Code: 500, Message: "base"}
+		wrapped1 := fmt.Errorf("layer1: %w", baseErr)
+		wrapped2 := fmt.Errorf("layer2: %w", wrapped1)
+		wrapped3 := fmt.Errorf("layer3: %w", wrapped2)
+
+		handled, result := HandleError(wrapped3,
+			OnCustomError(func(e *CustomError) error {
+				return fmt.Errorf("found custom error at code %d", e.Code)
+			}),
+		)
+
+		assert.True(t, handled)
+		assert.EqualError(t, result, "found custom error at code 500")
+	})
+}

pkg/utils/parse.go

@@ -0,0 +1,111 @@
+package utils
+
+import (
+	"fmt"
+	"net/url"
+	"strconv"
+	"time"
+)
+
+// ParseString attempts to parse the input string `s` into a value of the specified type T.
+// If parsing the string `s` fails for a supported type, it returns the zero value of T
+// and the parsing error.
+// /nolint:forcetypeassert,wrapcheck
+func ParseString[
+	T string | int | int8 | int16 | int32 | int64 | uint | uint8 | uint16 | uint32 | uint64 | float64 | bool | time.Duration | url.URL,
+](rawValue string) (T, error) {
+	var value T
+
+	switch any(value).(type) {
+	case int:
+		i, err := strconv.Atoi(rawValue)
+		if err != nil {
+			return value, err
+		}
+		value = any(i).(T)
+	case int8:
+		i, err := strconv.ParseInt(rawValue, 10, 8)
+		if err != nil {
+			return value, err
+		}
+		value = any(int8(i)).(T)
+	case int16:
+		i, err := strconv.ParseInt(rawValue, 10, 16)
+		if err != nil {
+			return value, err
+		}
+		value = any(int16(i)).(T)
+	case int32:
+		i, err := strconv.ParseInt(rawValue, 10, 32)
+		if err != nil {
+			return value, err
+		}
+		value = any(int32(i)).(T)
+	case int64:
+		i, err := strconv.ParseInt(rawValue, 10, 64)
+		if err != nil {
+			return value, err
+		}
+		value = any(i).(T)
+	case uint:
+		u, err := strconv.ParseUint(rawValue, 10, 0)
+		if err != nil {
+			return value, err
+		}
+		value = any(uint(u)).(T)
+	case uint8:
+		u, err := strconv.ParseUint(rawValue, 10, 8)
+		if err != nil {
+			return value, err
+		}
+		value = any(uint8(u)).(T)
+	case uint16:
+		u, err := strconv.ParseUint(rawValue, 10, 16)
+		if err != nil {
+			return value, err
+		}
+		value = any(uint16(u)).(T)
+	case uint32:
+		u, err := strconv.ParseUint(rawValue, 10, 32)
+		if err != nil {
+			return value, err
+		}
+		value = any(uint32(u)).(T)
+	case uint64:
+		u, err := strconv.ParseUint(rawValue, 10, 64)
+		if err != nil {
+			return value, err
+		}
+		value = any(u).(T)
+	case float64:
+		f, err := strconv.ParseFloat(rawValue, 64)
+		if err != nil {
+			return value, err
+		}
+		value = any(f).(T)
+	case bool:
+		b, err := strconv.ParseBool(rawValue)
+		if err != nil {
+			return value, err
+		}
+		value = any(b).(T)
+	case string:
+		value = any(rawValue).(T)
+	case time.Duration:
+		d, err := time.ParseDuration(rawValue)
+		if err != nil {
+			return value, err
+		}
+		value = any(d).(T)
+	case url.URL:
+		u, err := url.Parse(rawValue)
+		if err != nil {
+			return value, err
+		}
+		value = any(*u).(T)
+	default:
+		return value, fmt.Errorf("unsupported type: %T", value)
+	}
+
+	return value, nil
+}

pkg/utils/parse_test.go

@@ -0,0 +1,528 @@
+package utils
+
+import (
+	"net/url"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseString(t *testing.T) {
+	t.Run("ParseString to string", func(t *testing.T) {
+		tests := []struct {
+			name     string
+			input    string
+			expected string
+		}{
+			{"empty string", "", ""},
+			{"simple string", "hello", "hello"},
+			{"string with spaces", "hello world", "hello world"},
+			{"numeric string", "123", "123"},
+			{"special characters", "!@#$%^&*()", "!@#$%^&*()"},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[string](test.input)
+				require.NoError(t, err)
+				assert.Equal(t, test.expected, result)
+			})
+		}
+	})
+
+	t.Run("ParseString to int", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    int
+			expectError bool
+		}{
+			{"positive int", "42", 42, false},
+			{"negative int", "-42", -42, false},
+			{"zero", "0", 0, false},
+			{"invalid int", "abc", 0, true},
+			{"float string", "3.14", 0, true},
+			{"empty string", "", 0, true},
+			{"overflow string", "99999999999999999999", 0, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[int](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.Equal(t, test.expected, result)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to int8", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    int8
+			expectError bool
+		}{
+			{"valid int8", "127", 127, false},
+			{"min int8", "-128", -128, false},
+			{"overflow int8", "128", 0, true},
+			{"underflow int8", "-129", 0, true},
+			{"invalid", "abc", 0, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[int8](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.Equal(t, test.expected, result)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to int16", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    int16
+			expectError bool
+		}{
+			{"valid int16", "32767", 32767, false},
+			{"min int16", "-32768", -32768, false},
+			{"overflow int16", "32768", 0, true},
+			{"underflow int16", "-32769", 0, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[int16](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.Equal(t, test.expected, result)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to int32", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    int32
+			expectError bool
+		}{
+			{"valid int32", "2147483647", 2147483647, false},
+			{"min int32", "-2147483648", -2147483648, false},
+			{"overflow int32", "2147483648", 0, true},
+			{"underflow int32", "-2147483649", 0, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[int32](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.Equal(t, test.expected, result)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to int64", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    int64
+			expectError bool
+		}{
+			{"valid int64", "9223372036854775807", 9223372036854775807, false},
+			{"min int64", "-9223372036854775808", -9223372036854775808, false},
+			{"large number", "123456789012345", 123456789012345, false},
+			{"invalid", "not a number", 0, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[int64](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.Equal(t, test.expected, result)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to uint", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    uint
+			expectError bool
+		}{
+			{"valid uint", "42", 42, false},
+			{"zero", "0", 0, false},
+			{"large uint", "4294967295", 4294967295, false},
+			{"negative", "-1", 0, true},
+			{"invalid", "abc", 0, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[uint](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.Equal(t, test.expected, result)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to uint8", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    uint8
+			expectError bool
+		}{
+			{"valid uint8", "255", 255, false},
+			{"min uint8", "0", 0, false},
+			{"overflow uint8", "256", 0, true},
+			{"negative", "-1", 0, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[uint8](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.Equal(t, test.expected, result)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to uint16", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    uint16
+			expectError bool
+		}{
+			{"valid uint16", "65535", 65535, false},
+			{"min uint16", "0", 0, false},
+			{"overflow uint16", "65536", 0, true},
+			{"negative", "-1", 0, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[uint16](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.Equal(t, test.expected, result)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to uint32", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    uint32
+			expectError bool
+		}{
+			{"valid uint32", "4294967295", 4294967295, false},
+			{"min uint32", "0", 0, false},
+			{"overflow uint32", "4294967296", 0, true},
+			{"negative", "-1", 0, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[uint32](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.Equal(t, test.expected, result)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to uint64", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    uint64
+			expectError bool
+		}{
+			{"valid uint64", "18446744073709551615", 18446744073709551615, false},
+			{"min uint64", "0", 0, false},
+			{"large number", "123456789012345", 123456789012345, false},
+			{"negative", "-1", 0, true},
+			{"invalid", "not a number", 0, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[uint64](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.Equal(t, test.expected, result)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to float64", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    float64
+			expectError bool
+		}{
+			{"integer", "42", 42.0, false},
+			{"decimal", "3.14159", 3.14159, false},
+			{"negative", "-2.5", -2.5, false},
+			{"scientific notation", "1.23e10", 1.23e10, false},
+			{"zero", "0", 0.0, false},
+			{"invalid", "not a number", 0, true},
+			{"empty", "", 0, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[float64](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.InDelta(t, test.expected, result, 0.0001)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to bool", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    bool
+			expectError bool
+		}{
+			{"true lowercase", "true", true, false},
+			{"True mixed case", "True", true, false},
+			{"TRUE uppercase", "TRUE", true, false},
+			{"1 as true", "1", true, false},
+			{"false lowercase", "false", false, false},
+			{"False mixed case", "False", false, false},
+			{"FALSE uppercase", "FALSE", false, false},
+			{"0 as false", "0", false, false},
+			{"invalid", "yes", false, true},
+			{"empty", "", false, true},
+			{"numeric non-binary", "2", false, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[bool](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.Equal(t, test.expected, result)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to time.Duration", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			expected    time.Duration
+			expectError bool
+		}{
+			{"seconds", "10s", 10 * time.Second, false},
+			{"minutes", "5m", 5 * time.Minute, false},
+			{"hours", "2h", 2 * time.Hour, false},
+			{"combined", "1h30m45s", time.Hour + 30*time.Minute + 45*time.Second, false},
+			{"milliseconds", "500ms", 500 * time.Millisecond, false},
+			{"microseconds", "100us", 100 * time.Microsecond, false},
+			{"nanoseconds", "50ns", 50 * time.Nanosecond, false},
+			{"negative", "-5s", -5 * time.Second, false},
+			{"invalid", "5x", 0, true},
+			{"empty", "", 0, true},
+			{"no unit", "100", 0, true},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[time.Duration](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					assert.Equal(t, test.expected, result)
+				}
+			})
+		}
+	})
+
+	t.Run("ParseString to url.URL", func(t *testing.T) {
+		tests := []struct {
+			name        string
+			input       string
+			checkFunc   func(t *testing.T, u url.URL)
+			expectError bool
+		}{
+			{
+				name:  "http URL",
+				input: "http://example.com",
+				checkFunc: func(t *testing.T, u url.URL) {
+					t.Helper()
+					assert.Equal(t, "http", u.Scheme)
+					assert.Equal(t, "example.com", u.Host)
+				},
+				expectError: false,
+			},
+			{
+				name:  "https URL with path",
+				input: "https://example.com/path/to/resource",
+				checkFunc: func(t *testing.T, u url.URL) {
+					t.Helper()
+					assert.Equal(t, "https", u.Scheme)
+					assert.Equal(t, "example.com", u.Host)
+					assert.Equal(t, "/path/to/resource", u.Path)
+				},
+				expectError: false,
+			},
+			{
+				name:  "URL with query parameters",
+				input: "https://example.com/search?q=test&page=1",
+				checkFunc: func(t *testing.T, u url.URL) {
+					t.Helper()
+					assert.Equal(t, "https", u.Scheme)
+					assert.Equal(t, "example.com", u.Host)
+					assert.Equal(t, "/search", u.Path)
+					assert.Equal(t, "q=test&page=1", u.RawQuery)
+				},
+				expectError: false,
+			},
+			{
+				name:  "URL with port",
+				input: "http://localhost:8080/api",
+				checkFunc: func(t *testing.T, u url.URL) {
+					t.Helper()
+					assert.Equal(t, "http", u.Scheme)
+					assert.Equal(t, "localhost:8080", u.Host)
+					assert.Equal(t, "/api", u.Path)
+				},
+				expectError: false,
+			},
+			{
+				name:  "URL with fragment",
+				input: "https://example.com/page#section",
+				checkFunc: func(t *testing.T, u url.URL) {
+					t.Helper()
+					assert.Equal(t, "https", u.Scheme)
+					assert.Equal(t, "example.com", u.Host)
+					assert.Equal(t, "/page", u.Path)
+					assert.Equal(t, "section", u.Fragment)
+				},
+				expectError: false,
+			},
+			{
+				name:  "relative path",
+				input: "/path/to/resource",
+				checkFunc: func(t *testing.T, u url.URL) {
+					t.Helper()
+					assert.Empty(t, u.Scheme)
+					assert.Empty(t, u.Host)
+					assert.Equal(t, "/path/to/resource", u.Path)
+				},
+				expectError: false,
+			},
+			{
+				name:  "empty string",
+				input: "",
+				checkFunc: func(t *testing.T, u url.URL) {
+					t.Helper()
+					assert.Empty(t, u.String())
+				},
+				expectError: false,
+			},
+		}
+
+		for _, test := range tests {
+			t.Run(test.name, func(t *testing.T) {
+				result, err := ParseString[url.URL](test.input)
+				if test.expectError {
+					assert.Error(t, err)
+				} else {
+					require.NoError(t, err)
+					if test.checkFunc != nil {
+						test.checkFunc(t, result)
+					}
+				}
+			})
+		}
+	})
+
+	t.Run("Edge cases", func(t *testing.T) {
+		t.Run("whitespace handling for numeric types", func(t *testing.T) {
+			result, err := ParseString[int]("  42  ")
+			require.Error(t, err)
+			assert.Equal(t, 0, result)
+		})
+
+		t.Run("leading zeros for int", func(t *testing.T) {
+			result, err := ParseString[int]("007")
+			require.NoError(t, err)
+			assert.Equal(t, 7, result)
+		})
+
+		t.Run("plus sign for positive numbers", func(t *testing.T) {
+			result, err := ParseString[int]("+42")
+			require.NoError(t, err)
+			assert.Equal(t, 42, result)
+		})
+
+		t.Run("case sensitivity for bool", func(t *testing.T) {
+			testCases := []string{"t", "T", "f", "F"}
+			for _, tc := range testCases {
+				result, err := ParseString[bool](tc)
+				require.NoError(t, err)
+				if tc == "t" || tc == "T" {
+					assert.True(t, result)
+				} else {
+					assert.False(t, result)
+				}
+			}
+		})
+	})
+}

pkg/utils/print.go

@@ -0,0 +1,17 @@
+package utils
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/jedib0t/go-pretty/v6/text"
+)
+
+func PrintErr(color text.Color, format string, a ...any) {
+	fmt.Fprintln(os.Stderr, color.Sprintf(format, a...))
+}
+
+func PrintErrAndExit(color text.Color, exitCode int, format string, a ...any) {
+	PrintErr(color, format, a...)
+	os.Exit(exitCode)
+}

pkg/utils/print_test.go

@@ -0,0 +1,250 @@
+package utils
+
+import (
+	"bytes"
+	"context"
+	"io"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+
+	"github.com/jedib0t/go-pretty/v6/text"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestPrintErr(t *testing.T) {
+	t.Run("PrintErr writes to stderr with color", func(t *testing.T) {
+		// Capture stderr
+		oldStderr := os.Stderr
+		reader, writer, _ := os.Pipe()
+		os.Stderr = writer
+
+		// Call PrintErr
+		PrintErr(text.FgRed, "Error: %s", "test error")
+
+		// Restore stderr and read output
+		writer.Close()
+		os.Stderr = oldStderr
+		var buf bytes.Buffer
+		io.Copy(&buf, reader)
+		output := buf.String()
+
+		// The output should contain the message (color codes are included)
+		assert.Contains(t, output, "test error")
+		assert.Contains(t, output, "Error:")
+		assert.True(t, strings.HasSuffix(output, "\n"))
+	})
+
+	t.Run("PrintErr with multiple format arguments", func(t *testing.T) {
+		oldStderr := os.Stderr
+		reader, writer, _ := os.Pipe()
+		os.Stderr = writer
+
+		PrintErr(text.FgYellow, "Warning: %s at line %d", "issue", 42)
+
+		writer.Close()
+		os.Stderr = oldStderr
+		var buf bytes.Buffer
+		io.Copy(&buf, reader)
+		output := buf.String()
+
+		assert.Contains(t, output, "Warning: issue at line 42")
+	})
+
+	t.Run("PrintErr with no format arguments", func(t *testing.T) {
+		oldStderr := os.Stderr
+		reader, writer, _ := os.Pipe()
+		os.Stderr = writer
+
+		PrintErr(text.FgGreen, "Simple message")
+
+		writer.Close()
+		os.Stderr = oldStderr
+		var buf bytes.Buffer
+		io.Copy(&buf, reader)
+		output := buf.String()
+
+		assert.Contains(t, output, "Simple message")
+		assert.True(t, strings.HasSuffix(output, "\n"))
+	})
+
+	t.Run("PrintErr with different colors", func(t *testing.T) {
+		colors := []text.Color{
+			text.FgRed,
+			text.FgGreen,
+			text.FgYellow,
+			text.FgBlue,
+			text.FgMagenta,
+			text.FgCyan,
+		}
+
+		for _, color := range colors {
+			oldStderr := os.Stderr
+			reader, writer, _ := os.Pipe()
+			os.Stderr = writer
+
+			PrintErr(color, "Message with color")
+
+			writer.Close()
+			os.Stderr = oldStderr
+			var buf bytes.Buffer
+			io.Copy(&buf, reader)
+			output := buf.String()
+
+			assert.Contains(t, output, "Message with color")
+		}
+	})
+
+	t.Run("PrintErr with empty string", func(t *testing.T) {
+		oldStderr := os.Stderr
+		reader, writer, _ := os.Pipe()
+		os.Stderr = writer
+
+		PrintErr(text.FgRed, "")
+
+		writer.Close()
+		os.Stderr = oldStderr
+		var buf bytes.Buffer
+		io.Copy(&buf, reader)
+		output := buf.String()
+
+		assert.Equal(t, "\n", strings.TrimPrefix(output, "\x1b[31m\x1b[0m")) // Just newline after color codes
+	})
+
+	t.Run("PrintErr with special characters", func(t *testing.T) {
+		oldStderr := os.Stderr
+		reader, writer, _ := os.Pipe()
+		os.Stderr = writer
+
+		PrintErr(text.FgRed, "Special chars: %s", "!@#$%^&*()")
+
+		writer.Close()
+		os.Stderr = oldStderr
+		var buf bytes.Buffer
+		io.Copy(&buf, reader)
+		output := buf.String()
+
+		assert.Contains(t, output, "Special chars: !@#$%^&*()")
+	})
+
+	t.Run("PrintErr with percent sign in message", func(t *testing.T) {
+		oldStderr := os.Stderr
+		reader, writer, _ := os.Pipe()
+		os.Stderr = writer
+
+		PrintErr(text.FgRed, "Progress: 100%% complete")
+
+		writer.Close()
+		os.Stderr = oldStderr
+		var buf bytes.Buffer
+		io.Copy(&buf, reader)
+		output := buf.String()
+
+		assert.Contains(t, output, "Progress: 100% complete")
+	})
+}
+
+func TestPrintErrAndExit(t *testing.T) {
+	if os.Getenv("BE_CRASHER") == "1" {
+		// This is the subprocess that will actually call PrintErrAndExit
+		exitCode := 1
+		if code := os.Getenv("EXIT_CODE"); code != "" {
+			switch code {
+			case "0":
+				exitCode = 0
+			case "1":
+				exitCode = 1
+			case "2":
+				exitCode = 2
+			}
+		}
+		PrintErrAndExit(text.FgRed, exitCode, "Error: %s", "fatal error")
+		return
+	}
+
+	t.Run("PrintErrAndExit calls os.Exit with correct code", func(t *testing.T) {
+		testCases := []struct {
+			name     string
+			exitCode int
+		}{
+			{"Exit with code 0", 0},
+			{"Exit with code 1", 1},
+			{"Exit with code 2", 2},
+		}
+
+		for _, testCase := range testCases {
+			t.Run(testCase.name, func(t *testing.T) {
+				ctx := context.Background()
+				cmd := exec.CommandContext(ctx, os.Args[0], "-test.run=TestPrintErrAndExit")
+				cmd.Env = append(os.Environ(),
+					"BE_CRASHER=1",
+					"EXIT_CODE="+string(rune('0'+testCase.exitCode)))
+
+				var stderr bytes.Buffer
+				cmd.Stderr = &stderr
+
+				err := cmd.Run()
+
+				if testCase.exitCode == 0 {
+					require.NoError(t, err)
+				} else {
+					require.Error(t, err)
+					if exitErr, ok := err.(*exec.ExitError); ok {
+						assert.Equal(t, testCase.exitCode, exitErr.ExitCode())
+					}
+				}
+
+				// Check that error message was printed to stderr
+				assert.Contains(t, stderr.String(), "Error: fatal error")
+			})
+		}
+	})
+
+	t.Run("PrintErrAndExit prints before exiting", func(t *testing.T) {
+		ctx := context.Background()
+		cmd := exec.CommandContext(ctx, os.Args[0], "-test.run=TestPrintErrAndExit")
+		cmd.Env = append(os.Environ(), "BE_CRASHER=1", "EXIT_CODE=1")
+
+		var stderr bytes.Buffer
+		cmd.Stderr = &stderr
+
+		cmd.Run() // Ignore error since we expect non-zero exit
+
+		output := stderr.String()
+		assert.Contains(t, output, "Error: fatal error")
+		assert.True(t, strings.HasSuffix(output, "\n"))
+	})
+}
+
+// Benchmarks for performance testing
+func BenchmarkPrintErr(b *testing.B) {
+	// Redirect stderr to /dev/null for benchmarking
+	oldStderr := os.Stderr
+	devNull, _ := os.Open(os.DevNull)
+	os.Stderr = devNull
+	defer func() {
+		os.Stderr = oldStderr
+		devNull.Close()
+	}()
+
+	b.Run("Simple message", func(b *testing.B) {
+		for range b.N {
+			PrintErr(text.FgRed, "Error message")
+		}
+	})
+
+	b.Run("Formatted message", func(b *testing.B) {
+		for range b.N {
+			PrintErr(text.FgRed, "Error: %s at line %d", "issue", 42)
+		}
+	})
+
+	b.Run("Different colors", func(b *testing.B) {
+		colors := []text.Color{text.FgRed, text.FgGreen, text.FgYellow}
+		for idx := range b.N {
+			PrintErr(colors[idx%len(colors)], "Message %d", idx)
+		}
+	})
+}

readers/cli.go

@@ -1,155 +0,0 @@
-package readers
-
-import (
-	"flag"
-	"fmt"
-	"strings"
-
-	"github.com/aykhans/dodo/config"
-	. "github.com/aykhans/dodo/types"
-	"github.com/fatih/color"
-)
-
-const usageText = `Usage:
-  dodo [flags]
-
-Examples:
-
-Simple usage only with URL:
-  dodo -u https://example.com
-
-Simple usage with config file:
-  dodo -c /path/to/config/file/config.json
-
-Usage with all flags:
-  dodo -c /path/to/config/file/config.json -u https://example.com -m POST -d 10 -r 1000 -t 2000 --no-proxy-check -y
-
-Flags:
-  -h, --help                 help for dodo
-  -v, --version              version for dodo
-  -c, --config-file string   Path to the config file
-  -d, --dodos uint           Number of dodos(threads) (default %d)
-  -m, --method string        HTTP Method (default %s)
-  -r, --request uint         Number of total requests (default %d)
-  -t, --timeout uint32       Timeout for each request in milliseconds (default %d)
-  -u, --url string           URL for stress testing
-      --no-proxy-check bool  Do not check for proxies (default false)
-  -y, --yes bool             Answer yes to all questions (default false)`
-
-func CLIConfigReader() (*config.CLIConfig, error) {
-	flag.Usage = func() {
-		fmt.Printf(
-			usageText+"\n",
-			config.DefaultDodosCount,
-			config.DefaultMethod,
-			config.DefaultRequestCount,
-			config.DefaultTimeout,
-		)
-	}
-
-	var (
-		cliConfig          = config.NewCLIConfig(config.NewConfig("", 0, 0, 0, nil), NewOption(false), "")
-		configFile         = ""
-		yes                = false
-		method             = ""
-		url                = ""
-		dodosCount    uint = 0
-		requestsCount uint = 0
-		timeout       uint = 0
-		noProxyCheck  bool = false
-	)
-	{
-		flag.Bool("version", false, "Prints the version of the program")
-		flag.Bool("v", false, "Prints the version of the program")
-
-		flag.StringVar(&configFile, "config-file", "", "Path to the configuration file")
-		flag.StringVar(&configFile, "c", "", "Path to the configuration file")
-
-		flag.BoolVar(&yes, "yes", false, "Answer yes to all questions")
-		flag.BoolVar(&yes, "y", false, "Answer yes to all questions")
-
-		flag.StringVar(&method, "method", "", "HTTP Method")
-		flag.StringVar(&method, "m", "", "HTTP Method")
-
-		flag.StringVar(&url, "url", "", "URL to send the request")
-		flag.StringVar(&url, "u", "", "URL to send the request")
-
-		flag.UintVar(&dodosCount, "dodos", 0, "Number of dodos(threads)")
-		flag.UintVar(&dodosCount, "d", 0, "Number of dodos(threads)")
-
-		flag.UintVar(&requestsCount, "requests", 0, "Number of total requests")
-		flag.UintVar(&requestsCount, "r", 0, "Number of total requests")
-
-		flag.UintVar(&timeout, "timeout", 0, "Timeout for each request in milliseconds")
-		flag.UintVar(&timeout, "t", 0, "Timeout for each request in milliseconds")
-
-		flag.BoolVar(&noProxyCheck, "no-proxy-check", false, "Do not check for active proxies")
-	}
-
-	flag.Parse()
-
-	args := flag.Args()
-	if len(args) > 0 {
-		return nil, fmt.Errorf("unexpected arguments: %v", strings.Join(args, ", "))
-	}
-
-	returnNil := false
-	flag.Visit(func(f *flag.Flag) {
-		switch f.Name {
-		case "version", "v":
-			fmt.Printf("dodo version %s\n", config.VERSION)
-			returnNil = true
-		case "config-file", "c":
-			cliConfig.ConfigFile = configFile
-		case "yes", "y":
-			cliConfig.Yes.SetValue(yes)
-		case "method", "m":
-			cliConfig.Method = method
-		case "url", "u":
-			cliConfig.URL = url
-		case "dodos", "d":
-			cliConfig.DodosCount = dodosCount
-		case "requests", "r":
-			cliConfig.RequestCount = requestsCount
-		case "timeout", "t":
-			var maxUint32 uint = 4294967295
-			if timeout > maxUint32 {
-				color.Yellow("timeout value is too large, setting to %d", maxUint32)
-				timeout = maxUint32
-			}
-			cliConfig.Timeout = uint32(timeout)
-		case "no-proxy-check":
-			cliConfig.NoProxyCheck.SetValue(noProxyCheck)
-		}
-	})
-
-	if returnNil {
-		return nil, nil
-	}
-	return cliConfig, nil
-}
-
-// CLIYesOrNoReader reads a yes or no answer from the command line.
-// It prompts the user with the given message and default value,
-// and returns true if the user answers "y" or "Y", and false otherwise.
-// If there is an error while reading the input, it returns false.
-// If the user simply presses enter without providing any input,
-// it returns the default value specified by the `dft` parameter.
-func CLIYesOrNoReader(message string, dft bool) bool {
-	var answer string
-	defaultMessage := "Y/n"
-	if !dft {
-		defaultMessage = "y/N"
-	}
-	fmt.Printf("%s [%s]: ", message, defaultMessage)
-	if _, err := fmt.Scanln(&answer); err != nil {
-		if err.Error() == "unexpected newline" {
-			return dft
-		}
-		return false
-	}
-	if answer == "" {
-		return dft
-	}
-	return answer == "y" || answer == "Y"
-}

readers/json.go

@@ -1,36 +0,0 @@
-package readers
-
-import (
-	"encoding/json"
-	"os"
-
-	"github.com/aykhans/dodo/config"
-	customerrors "github.com/aykhans/dodo/custom_errors"
-)
-
-func JSONConfigReader(filePath string) (*config.JSONConfig, error) {
-	data, err := os.ReadFile(filePath)
-	if err != nil {
-		return nil, customerrors.OSErrorFormater(err)
-	}
-	jsonConf := config.NewJSONConfig(
-		config.NewConfig("", 0, 0, 0, nil),
-		nil, nil, nil, nil, nil,
-	)
-	err = json.Unmarshal(data, &jsonConf)
-
-	if err != nil {
-		switch err := err.(type) {
-		case *json.UnmarshalTypeError:
-			return nil,
-				customerrors.NewTypeError(
-					err.Type.String(),
-					err.Value,
-					err.Field,
-					err,
-				)
-		}
-		return nil, customerrors.NewInvalidFileError(filePath, err)
-	}
-	return jsonConf, nil
-}

requests/client.go

@@ -1,316 +0,0 @@
-package requests
-
-import (
-	"context"
-	"fmt"
-	"math/rand"
-	"net/url"
-	"sync"
-	"time"
-
-	"github.com/aykhans/dodo/config"
-	"github.com/aykhans/dodo/readers"
-	"github.com/aykhans/dodo/utils"
-	"github.com/fatih/color"
-	"github.com/valyala/fasthttp"
-	"github.com/valyala/fasthttp/fasthttpproxy"
-)
-
-type ClientGeneratorFunc func() *fasthttp.HostClient
-
-// getClients initializes and returns a slice of fasthttp.HostClient based on the provided parameters.
-// It can either return clients with proxies or a single client without proxies.
-func getClients(
-	ctx context.Context,
-	timeout time.Duration,
-	proxies []config.Proxy,
-	dodosCount uint,
-	maxConns uint,
-	yes bool,
-	noProxyCheck bool,
-	URL *url.URL,
-) []*fasthttp.HostClient {
-	isTLS := URL.Scheme == "https"
-
-	if proxiesLen := len(proxies); proxiesLen > 0 {
-		// If noProxyCheck is true, we will return the clients without checking the proxies.
-		if noProxyCheck {
-			clients := make([]*fasthttp.HostClient, 0, proxiesLen)
-			addr := URL.Host
-			if isTLS && URL.Port() == "" {
-				addr += ":443"
-			}
-
-			for _, proxy := range proxies {
-				dialFunc, err := getDialFunc(&proxy, timeout)
-				if err != nil {
-					continue
-				}
-
-				clients = append(clients, &fasthttp.HostClient{
-					MaxConns:            int(maxConns),
-					IsTLS:               isTLS,
-					Addr:                addr,
-					Dial:                dialFunc,
-					MaxIdleConnDuration: timeout,
-					MaxConnDuration:     timeout,
-					WriteTimeout:        timeout,
-					ReadTimeout:         timeout,
-				},
-				)
-			}
-			return clients
-		}
-
-		// Else, we will check the proxies and return the active ones.
-		activeProxyClients := getActiveProxyClients(
-			ctx, proxies, timeout, dodosCount, maxConns, URL,
-		)
-		if ctx.Err() != nil {
-			return nil
-		}
-		activeProxyClientsCount := uint(len(activeProxyClients))
-		var yesOrNoMessage string
-		var yesOrNoDefault bool
-		if activeProxyClientsCount == 0 {
-			yesOrNoDefault = false
-			yesOrNoMessage = color.YellowString("No active proxies found. Do you want to continue?")
-		} else {
-			yesOrNoMessage = color.YellowString("Found %d active proxies. Do you want to continue?", activeProxyClientsCount)
-		}
-		if !yes {
-			response := readers.CLIYesOrNoReader("\n"+yesOrNoMessage, yesOrNoDefault)
-			if !response {
-				utils.PrintAndExit("Exiting...")
-			}
-		}
-		fmt.Println()
-		if activeProxyClientsCount > 0 {
-			return activeProxyClients
-		}
-	}
-
-	client := &fasthttp.HostClient{
-		MaxConns:            int(maxConns),
-		IsTLS:               isTLS,
-		Addr:                URL.Host,
-		MaxIdleConnDuration: timeout,
-		MaxConnDuration:     timeout,
-		WriteTimeout:        timeout,
-		ReadTimeout:         timeout,
-	}
-	return []*fasthttp.HostClient{client}
-}
-
-// getActiveProxyClients divides the proxies into slices based on the number of dodos and
-// launches goroutines to find active proxy clients for each slice.
-// It uses a progress tracker to monitor the progress of the search.
-// Once all goroutines have completed, the function waits for them to finish and
-// returns a flattened slice of active proxy clients.
-func getActiveProxyClients(
-	ctx context.Context,
-	proxies []config.Proxy,
-	timeout time.Duration,
-	dodosCount uint,
-	maxConns uint,
-	URL *url.URL,
-) []*fasthttp.HostClient {
-	activeProxyClientsArray := make([][]*fasthttp.HostClient, dodosCount)
-	proxiesCount := len(proxies)
-	dodosCountInt := int(dodosCount)
-
-	var (
-		wg       sync.WaitGroup
-		streamWG sync.WaitGroup
-	)
-	wg.Add(dodosCountInt)
-	streamWG.Add(1)
-	var proxiesSlice []config.Proxy
-	increase := make(chan int64, proxiesCount)
-
-	streamCtx, streamCtxCancel := context.WithCancel(context.Background())
-	go streamProgress(streamCtx, &streamWG, int64(proxiesCount), "Searching for active proxies🌐", increase)
-
-	for i := range dodosCountInt {
-		if i+1 == dodosCountInt {
-			proxiesSlice = proxies[i*proxiesCount/dodosCountInt:]
-		} else {
-			proxiesSlice = proxies[i*proxiesCount/dodosCountInt : (i+1)*proxiesCount/dodosCountInt]
-		}
-		go findActiveProxyClients(
-			ctx,
-			proxiesSlice,
-			timeout,
-			&activeProxyClientsArray[i],
-			increase,
-			maxConns,
-			URL,
-			&wg,
-		)
-	}
-	wg.Wait()
-	streamCtxCancel()
-	streamWG.Wait()
-	return utils.Flatten(activeProxyClientsArray)
-}
-
-// findActiveProxyClients checks a list of proxies to determine which ones are active
-// and appends the active ones to the provided activeProxyClients slice.
-//
-// Parameters:
-//   - ctx: The context to control cancellation and timeout.
-//   - proxies: A slice of Proxy configurations to be checked.
-//   - timeout: The duration to wait for each proxy check before timing out.
-//   - activeProxyClients: A pointer to a slice where active proxy clients will be appended.
-//   - increase: A channel to signal the increase of checked proxies count.
-//   - URL: The URL to be used for checking the proxies.
-//   - wg: A WaitGroup to signal when the function is done.
-//
-// The function sends a GET request to each proxy using the provided URL. If the proxy
-// responds with a status code of 200, it is considered active and added to the activeProxyClients slice.
-// The function respects the context's cancellation and timeout settings.
-func findActiveProxyClients(
-	ctx context.Context,
-	proxies []config.Proxy,
-	timeout time.Duration,
-	activeProxyClients *[]*fasthttp.HostClient,
-	increase chan<- int64,
-	maxConns uint,
-	URL *url.URL,
-	wg *sync.WaitGroup,
-) {
-	defer wg.Done()
-
-	request := fasthttp.AcquireRequest()
-	defer fasthttp.ReleaseRequest(request)
-	request.SetRequestURI(config.ProxyCheckURL)
-	request.Header.SetMethod("GET")
-
-	for _, proxy := range proxies {
-		if ctx.Err() != nil {
-			return
-		}
-
-		func() {
-			defer func() { increase <- 1 }()
-
-			response := fasthttp.AcquireResponse()
-			defer fasthttp.ReleaseResponse(response)
-
-			dialFunc, err := getDialFunc(&proxy, timeout)
-			if err != nil {
-				return
-			}
-			client := &fasthttp.Client{
-				Dial: dialFunc,
-			}
-			defer client.CloseIdleConnections()
-
-			ch := make(chan error)
-			go func() {
-				err := client.DoTimeout(request, response, timeout)
-				ch <- err
-			}()
-			select {
-			case err := <-ch:
-				if err != nil {
-					return
-				}
-				break
-			case <-time.After(timeout):
-				return
-			case <-ctx.Done():
-				return
-			}
-
-			isTLS := URL.Scheme == "https"
-			addr := URL.Host
-			if isTLS && URL.Port() == "" {
-				addr += ":443"
-			}
-			if response.StatusCode() == 200 {
-				*activeProxyClients = append(
-					*activeProxyClients,
-					&fasthttp.HostClient{
-						MaxConns:            int(maxConns),
-						IsTLS:               isTLS,
-						Addr:                addr,
-						Dial:                dialFunc,
-						MaxIdleConnDuration: timeout,
-						MaxConnDuration:     timeout,
-						WriteTimeout:        timeout,
-						ReadTimeout:         timeout,
-					},
-				)
-			}
-		}()
-	}
-}
-
-// getDialFunc returns a fasthttp.DialFunc based on the provided proxy configuration.
-// It takes a pointer to a config.Proxy struct as input and returns a fasthttp.DialFunc and an error.
-// The function parses the proxy URL, determines the scheme (socks5, socks5h, http, or https),
-// and creates a dialer accordingly. If the proxy URL is invalid or the scheme is not supported,
-// it returns an error.
-func getDialFunc(proxy *config.Proxy, timeout time.Duration) (fasthttp.DialFunc, error) {
-	parsedProxyURL, err := url.Parse(proxy.URL)
-	if err != nil {
-		return nil, err
-	}
-
-	var dialer fasthttp.DialFunc
-	if parsedProxyURL.Scheme == "socks5" || parsedProxyURL.Scheme == "socks5h" {
-		if proxy.Username != "" {
-			dialer = fasthttpproxy.FasthttpSocksDialer(
-				fmt.Sprintf(
-					"%s://%s:%s@%s",
-					parsedProxyURL.Scheme,
-					proxy.Username,
-					proxy.Password,
-					parsedProxyURL.Host,
-				),
-			)
-		} else {
-			dialer = fasthttpproxy.FasthttpSocksDialer(
-				fmt.Sprintf(
-					"%s://%s",
-					parsedProxyURL.Scheme,
-					parsedProxyURL.Host,
-				),
-			)
-		}
-	} else if parsedProxyURL.Scheme == "http" {
-		if proxy.Username != "" {
-			dialer = fasthttpproxy.FasthttpHTTPDialerTimeout(
-				fmt.Sprintf(
-					"%s:%s@%s",
-					proxy.Username, proxy.Password, parsedProxyURL.Host,
-				),
-				timeout,
-			)
-		} else {
-			dialer = fasthttpproxy.FasthttpHTTPDialerTimeout(
-				parsedProxyURL.Host,
-				timeout,
-			)
-		}
-	} else {
-		return nil, err
-	}
-	return dialer, nil
-}
-
-// getSharedClientFuncMultiple returns a ClientGeneratorFunc that cycles through a list of fasthttp.HostClient instances.
-// The function uses a local random number generator to determine the starting index and stop index for cycling through the clients.
-// The returned function isn't thread-safe and should be used in a single-threaded context.
-func getSharedClientFuncMultiple(clients []*fasthttp.HostClient, localRand *rand.Rand) ClientGeneratorFunc {
-	return utils.RandomValueCycle(clients, localRand)
-}
-
-// getSharedClientFuncSingle returns a ClientGeneratorFunc that always returns the provided fasthttp.HostClient instance.
-// This can be useful for sharing a single client instance across multiple requests.
-func getSharedClientFuncSingle(client *fasthttp.HostClient) ClientGeneratorFunc {
-	return func() *fasthttp.HostClient {
-		return client
-	}
-}

requests/helper.go

@@ -1,75 +0,0 @@
-package requests
-
-import (
-	"context"
-	"fmt"
-	"sync"
-	"time"
-
-	"github.com/jedib0t/go-pretty/v6/progress"
-	"github.com/valyala/fasthttp"
-)
-
-// streamProgress streams the progress of a task to the console using a progress bar.
-// It listens for increments on the provided channel and updates the progress bar accordingly.
-//
-// The function will stop and mark the progress as errored if the context is cancelled.
-// It will also stop and mark the progress as done when the total number of increments is reached.
-func streamProgress(
-	ctx context.Context,
-	wg *sync.WaitGroup,
-	total int64,
-	message string,
-	increase <-chan int64,
-) {
-	defer wg.Done()
-	pw := progress.NewWriter()
-	pw.SetTrackerPosition(progress.PositionRight)
-	pw.SetStyle(progress.StyleBlocks)
-	pw.SetTrackerLength(40)
-	pw.SetUpdateFrequency(time.Millisecond * 250)
-	go pw.Render()
-	dodosTracker := progress.Tracker{
-		Message: message,
-		Total:   total,
-	}
-	pw.AppendTracker(&dodosTracker)
-	for {
-		select {
-		case <-ctx.Done():
-			fmt.Printf("\r")
-			dodosTracker.MarkAsErrored()
-			time.Sleep(time.Millisecond * 300)
-			pw.Stop()
-			return
-
-		case value := <-increase:
-			dodosTracker.Increment(value)
-		}
-	}
-}
-
-// checkConnection checks the internet connection by making requests to different websites.
-// It returns true if the connection is successful, otherwise false.
-func checkConnection(ctx context.Context) bool {
-	ch := make(chan bool)
-	go func() {
-		_, _, err := fasthttp.Get(nil, "https://www.google.com")
-		if err != nil {
-			_, _, err = fasthttp.Get(nil, "https://www.bing.com")
-			if err != nil {
-				_, _, err = fasthttp.Get(nil, "https://www.yahoo.com")
-				ch <- err == nil
-			}
-			ch <- true
-		}
-		ch <- true
-	}()
-
-	select {
-	case <-ctx.Done():
-		return false
-	case res := <-ch:
-		return res
-	}
-}

requests/request.go

@@ -1,248 +0,0 @@
-package requests
-
-import (
-	"context"
-	"math/rand"
-	"net/url"
-	"time"
-
-	"github.com/aykhans/dodo/config"
-	customerrors "github.com/aykhans/dodo/custom_errors"
-	"github.com/aykhans/dodo/utils"
-	"github.com/valyala/fasthttp"
-)
-
-type RequestGeneratorFunc func() *fasthttp.Request
-
-// Request represents an HTTP request to be sent using the fasthttp client.
-// It isn't thread-safe and should be used by a single goroutine.
-type Request struct {
-	getClient  ClientGeneratorFunc
-	getRequest RequestGeneratorFunc
-}
-
-// Send sends the HTTP request using the fasthttp client with a specified timeout.
-// It returns the HTTP response or an error if the request fails or times out.
-func (r *Request) Send(ctx context.Context, timeout time.Duration) (*fasthttp.Response, error) {
-	client := r.getClient()
-	request := r.getRequest()
-	defer fasthttp.ReleaseRequest(request)
-
-	response := fasthttp.AcquireResponse()
-	ch := make(chan error)
-	go func() {
-		err := client.DoTimeout(request, response, timeout)
-		ch <- err
-	}()
-	select {
-	case err := <-ch:
-		if err != nil {
-			fasthttp.ReleaseResponse(response)
-			return nil, err
-		}
-		return response, nil
-	case <-time.After(timeout):
-		fasthttp.ReleaseResponse(response)
-		return nil, customerrors.ErrTimeout
-	case <-ctx.Done():
-		return nil, customerrors.ErrInterrupt
-	}
-}
-
-// newRequest creates a new Request instance based on the provided configuration and clients.
-// It initializes a random number generator using the current time and a unique identifier (uid).
-// Depending on the number of clients provided, it sets up a function to select the appropriate client.
-// It also sets up a function to generate the request based on the provided configuration.
-func newRequest(
-	requestConfig config.RequestConfig,
-	clients []*fasthttp.HostClient,
-	uid int64,
-) *Request {
-	localRand := rand.New(rand.NewSource(time.Now().UnixNano() + uid))
-
-	clientsCount := len(clients)
-	if clientsCount < 1 {
-		panic("no clients")
-	}
-
-	getClient := ClientGeneratorFunc(nil)
-	if clientsCount == 1 {
-		getClient = getSharedClientFuncSingle(clients[0])
-	} else {
-		getClient = getSharedClientFuncMultiple(clients, localRand)
-	}
-
-	getRequest := getRequestGeneratorFunc(
-		requestConfig.URL,
-		requestConfig.Headers,
-		requestConfig.Cookies,
-		requestConfig.Params,
-		requestConfig.Method,
-		requestConfig.Body,
-		localRand,
-	)
-
-	requests := &Request{
-		getClient:  getClient,
-		getRequest: getRequest,
-	}
-
-	return requests
-}
-
-// getRequestGeneratorFunc returns a RequestGeneratorFunc which generates HTTP requests
-// with the specified parameters.
-// The function uses a local random number generator to select bodies, headers, cookies, and parameters
-// if multiple options are provided.
-func getRequestGeneratorFunc(
-	URL *url.URL,
-	Headers map[string][]string,
-	Cookies map[string][]string,
-	Params map[string][]string,
-	Method string,
-	Bodies []string,
-	localRand *rand.Rand,
-) RequestGeneratorFunc {
-	bodiesLen := len(Bodies)
-	getBody := func() string { return "" }
-	if bodiesLen == 1 {
-		getBody = func() string { return Bodies[0] }
-	} else if bodiesLen > 1 {
-		getBody = utils.RandomValueCycle(Bodies, localRand)
-	}
-	getHeaders := getKeyValueSetFunc(Headers, localRand)
-	getCookies := getKeyValueSetFunc(Cookies, localRand)
-	getParams := getKeyValueSetFunc(Params, localRand)
-
-	return func() *fasthttp.Request {
-		return newFasthttpRequest(
-			URL,
-			getHeaders(),
-			getCookies(),
-			getParams(),
-			Method,
-			getBody(),
-		)
-	}
-}
-
-// newFasthttpRequest creates a new fasthttp.Request object with the provided parameters.
-// It sets the request URI, host header, headers, cookies, params, method, and body.
-func newFasthttpRequest(
-	URL *url.URL,
-	Headers map[string]string,
-	Cookies map[string]string,
-	Params map[string]string,
-	Method string,
-	Body string,
-) *fasthttp.Request {
-	request := fasthttp.AcquireRequest()
-	request.SetRequestURI(URL.Path)
-
-	// Set the host of the request to the host header
-	// If the host header is not set, the request will fail
-	// If there is host header in the headers, it will be overwritten
-	request.Header.Set("Host", URL.Host)
-	setRequestHeaders(request, Headers)
-	setRequestCookies(request, Cookies)
-	setRequestParams(request, Params)
-	setRequestMethod(request, Method)
-	setRequestBody(request, Body)
-	if URL.Scheme == "https" {
-		request.URI().SetScheme("https")
-	}
-
-	return request
-}
-
-// setRequestHeaders sets the headers of the given request with the provided key-value pairs.
-func setRequestHeaders(req *fasthttp.Request, headers map[string]string) {
-	req.Header.Set("User-Agent", config.DefaultUserAgent)
-	for key, value := range headers {
-		req.Header.Set(key, value)
-	}
-}
-
-// setRequestCookies sets the cookies in the given request.
-func setRequestCookies(req *fasthttp.Request, cookies map[string]string) {
-	for key, value := range cookies {
-		req.Header.SetCookie(key, value)
-	}
-}
-
-// setRequestParams sets the query parameters of the given request based on the provided map of key-value pairs.
-func setRequestParams(req *fasthttp.Request, params map[string]string) {
-	urlParams := url.Values{}
-	for key, value := range params {
-		urlParams.Add(key, value)
-	}
-	req.URI().SetQueryString(urlParams.Encode())
-}
-
-// setRequestMethod sets the HTTP request method for the given request.
-func setRequestMethod(req *fasthttp.Request, method string) {
-	req.Header.SetMethod(method)
-}
-
-// setRequestBody sets the request body of the given fasthttp.Request object.
-// The body parameter is a string that will be converted to a byte slice and set as the request body.
-func setRequestBody(req *fasthttp.Request, body string) {
-	req.SetBody([]byte(body))
-}
-
-// getKeyValueSetFunc generates a function that returns a map of key-value pairs based on the provided key-value set.
-// The generated function will either return fixed values or random values depending on the input.
-//
-// Returns:
-//   - A function that returns a map of key-value pairs. If the input map contains multiple values for a key,
-//     the returned function will generate random values for that key. If the input map contains a single value
-//     for a key, the returned function will always return that value. If the input map is empty for a key,
-//     the returned function will generate an empty string for that key.
-func getKeyValueSetFunc[
-	KeyValueSet map[string][]string,
-	KeyValue map[string]string,
-](keyValueSet KeyValueSet, localRand *rand.Rand) func() KeyValue {
-	getKeyValueSlice := []map[string]func() string{}
-	isRandom := false
-	for key, values := range keyValueSet {
-		valuesLen := len(values)
-
-		// if values is empty, return a function that generates empty string
-		// if values has only one element, return a function that generates that element
-		// if values has more than one element, return a function that generates a random element
-		getKeyValue := func() string { return "" }
-		if valuesLen == 1 {
-			getKeyValue = func() string { return values[0] }
-		} else if valuesLen > 1 {
-			getKeyValue = utils.RandomValueCycle(values, localRand)
-			isRandom = true
-		}
-
-		getKeyValueSlice = append(
-			getKeyValueSlice,
-			map[string]func() string{key: getKeyValue},
-		)
-	}
-
-	// if isRandom is true, return a function that generates random values,
-	// otherwise return a function that generates fixed values to avoid unnecessary random number generation
-	if isRandom {
-		return func() KeyValue {
-			keyValues := make(KeyValue, len(getKeyValueSlice))
-			for _, keyValue := range getKeyValueSlice {
-				for key, value := range keyValue {
-					keyValues[key] = value()
-				}
-			}
-			return keyValues
-		}
-	} else {
-		keyValues := make(KeyValue, len(getKeyValueSlice))
-		for _, keyValue := range getKeyValueSlice {
-			for key, value := range keyValue {
-				keyValues[key] = value()
-			}
-		}
-		return func() KeyValue { return keyValues }
-	}
-}

requests/response.go

@@ -1,108 +0,0 @@
-package requests
-
-import (
-	"os"
-	"time"
-
-	. "github.com/aykhans/dodo/types"
-	"github.com/aykhans/dodo/utils"
-	"github.com/jedib0t/go-pretty/v6/table"
-)
-
-type Response struct {
-	Response string
-	Time     time.Duration
-}
-
-type Responses []*Response
-
-// Print prints the responses in a tabular format, including information such as
-// response count, minimum time, maximum time, average time, and latency percentiles.
-func (responses Responses) Print() {
-	total := struct {
-		Count int
-		Min   time.Duration
-		Max   time.Duration
-		Sum   time.Duration
-		P90   time.Duration
-		P95   time.Duration
-		P99   time.Duration
-	}{
-		Count: len(responses),
-		Min:   responses[0].Time,
-		Max:   responses[0].Time,
-	}
-	mergedResponses := make(map[string]Durations)
-	var allDurations Durations
-
-	for _, response := range responses {
-		if response.Time < total.Min {
-			total.Min = response.Time
-		}
-		if response.Time > total.Max {
-			total.Max = response.Time
-		}
-		total.Sum += response.Time
-
-		mergedResponses[response.Response] = append(
-			mergedResponses[response.Response],
-			response.Time,
-		)
-		allDurations = append(allDurations, response.Time)
-	}
-	allDurations.Sort()
-	allDurationsLenAsFloat := float64(len(allDurations) - 1)
-	total.P90 = allDurations[int(0.90*allDurationsLenAsFloat)]
-	total.P95 = allDurations[int(0.95*allDurationsLenAsFloat)]
-	total.P99 = allDurations[int(0.99*allDurationsLenAsFloat)]
-
-	t := table.NewWriter()
-	t.SetOutputMirror(os.Stdout)
-	t.SetStyle(table.StyleLight)
-	t.SetColumnConfigs([]table.ColumnConfig{
-		{Number: 1, WidthMax: 40},
-	})
-	t.AppendHeader(table.Row{
-		"Response",
-		"Count",
-		"Min",
-		"Max",
-		"Average",
-		"P90",
-		"P95",
-		"P99",
-	})
-
-	var roundPrecision int64 = 4
-	for key, durations := range mergedResponses {
-		durations.Sort()
-		durationsLen := len(durations)
-		durationsLenAsFloat := float64(durationsLen - 1)
-
-		t.AppendRow(table.Row{
-			key,
-			durationsLen,
-			utils.DurationRoundBy(*durations.First(), roundPrecision),
-			utils.DurationRoundBy(*durations.Last(), roundPrecision),
-			utils.DurationRoundBy(durations.Avg(), roundPrecision),
-			utils.DurationRoundBy(durations[int(0.90*durationsLenAsFloat)], roundPrecision),
-			utils.DurationRoundBy(durations[int(0.95*durationsLenAsFloat)], roundPrecision),
-			utils.DurationRoundBy(durations[int(0.99*durationsLenAsFloat)], roundPrecision),
-		})
-		t.AppendSeparator()
-	}
-
-	if len(mergedResponses) > 1 {
-		t.AppendRow(table.Row{
-			"Total",
-			total.Count,
-			utils.DurationRoundBy(total.Min, roundPrecision),
-			utils.DurationRoundBy(total.Max, roundPrecision),
-			utils.DurationRoundBy(total.Sum/time.Duration(total.Count), roundPrecision), // Average
-			utils.DurationRoundBy(total.P90, roundPrecision),
-			utils.DurationRoundBy(total.P95, roundPrecision),
-			utils.DurationRoundBy(total.P99, roundPrecision),
-		})
-	}
-	t.Render()
-}

requests/run.go

@@ -1,160 +0,0 @@
-package requests
-
-import (
-	"context"
-	"strconv"
-	"sync"
-	"time"
-
-	"github.com/aykhans/dodo/config"
-	customerrors "github.com/aykhans/dodo/custom_errors"
-	"github.com/aykhans/dodo/utils"
-	"github.com/valyala/fasthttp"
-)
-
-// Run executes the main logic for processing requests based on the provided configuration.
-// It first checks for an internet connection with a timeout context. If no connection is found,
-// it returns an error. Then, it initializes clients based on the request configuration and
-// releases the dodos. If the context is canceled and no responses are collected, it returns an interrupt error.
-//
-// Parameters:
-//   - ctx: The context for managing request lifecycle and cancellation.
-//   - requestConfig: The configuration for the request, including timeout, proxies, and other settings.
-//
-// Returns:
-//   - Responses: A collection of responses from the executed requests.
-//   - error: An error if the operation fails, such as no internet connection or an interrupt.
-func Run(ctx context.Context, requestConfig *config.RequestConfig) (Responses, error) {
-	checkConnectionCtx, checkConnectionCtxCancel := context.WithTimeout(ctx, 8*time.Second)
-	if !checkConnection(checkConnectionCtx) {
-		checkConnectionCtxCancel()
-		return nil, customerrors.ErrNoInternet
-	}
-	checkConnectionCtxCancel()
-
-	clients := getClients(
-		ctx,
-		requestConfig.Timeout,
-		requestConfig.Proxies,
-		requestConfig.GetValidDodosCountForProxies(),
-		requestConfig.GetMaxConns(fasthttp.DefaultMaxConnsPerHost),
-		requestConfig.Yes,
-		requestConfig.NoProxyCheck,
-		requestConfig.URL,
-	)
-	if clients == nil {
-		return nil, customerrors.ErrInterrupt
-	}
-
-	responses := releaseDodos(ctx, requestConfig, clients)
-	if ctx.Err() != nil && len(responses) == 0 {
-		return nil, customerrors.ErrInterrupt
-	}
-
-	return responses, nil
-}
-
-// releaseDodos sends requests concurrently using multiple dodos (goroutines) and returns the aggregated responses.
-//
-// The function performs the following steps:
-//  1. Initializes wait groups and other necessary variables.
-//  2. Starts a goroutine to stream progress updates.
-//  3. Distributes the total request count among the dodos.
-//  4. Starts a goroutine for each dodo to send requests concurrently.
-//  5. Waits for all dodos to complete their requests.
-//  6. Cancels the progress streaming context and waits for the progress goroutine to finish.
-//  7. Flattens and returns the aggregated responses.
-func releaseDodos(
-	ctx context.Context,
-	requestConfig *config.RequestConfig,
-	clients []*fasthttp.HostClient,
-) Responses {
-	var (
-		wg                  sync.WaitGroup
-		streamWG            sync.WaitGroup
-		requestCountPerDodo uint
-		dodosCount          uint = requestConfig.GetValidDodosCountForRequests()
-		dodosCountInt       int  = int(dodosCount)
-		requestCount        uint = requestConfig.RequestCount
-		responses                = make([][]*Response, dodosCount)
-		increase                 = make(chan int64, requestCount)
-	)
-
-	wg.Add(dodosCountInt)
-	streamWG.Add(1)
-	streamCtx, streamCtxCancel := context.WithCancel(context.Background())
-
-	go streamProgress(streamCtx, &streamWG, int64(requestCount), "Dodos Working🔥", increase)
-
-	for i := range dodosCount {
-		if i+1 == dodosCount {
-			requestCountPerDodo = requestCount - (i * requestCount / dodosCount)
-		} else {
-			requestCountPerDodo = ((i + 1) * requestCount / dodosCount) -
-				(i * requestCount / dodosCount)
-		}
-
-		go sendRequest(
-			ctx,
-			newRequest(*requestConfig, clients, int64(i)),
-			requestConfig.Timeout,
-			requestCountPerDodo,
-			&responses[i],
-			increase,
-			&wg,
-		)
-	}
-	wg.Wait()
-	streamCtxCancel()
-	streamWG.Wait()
-	return utils.Flatten(responses)
-}
-
-// sendRequest sends a specified number of HTTP requests concurrently with a given timeout.
-// It appends the responses to the provided responseData slice and sends the count of completed requests
-// to the increase channel. The function terminates early if the context is canceled or if a custom
-// interrupt error is encountered.
-func sendRequest(
-	ctx context.Context,
-	request *Request,
-	timeout time.Duration,
-	requestCount uint,
-	responseData *[]*Response,
-	increase chan<- int64,
-	wg *sync.WaitGroup,
-) {
-	defer wg.Done()
-
-	for range requestCount {
-		if ctx.Err() != nil {
-			return
-		}
-
-		func() {
-			startTime := time.Now()
-			response, err := request.Send(ctx, timeout)
-			completedTime := time.Since(startTime)
-			if response != nil {
-				defer fasthttp.ReleaseResponse(response)
-			}
-
-			if err != nil {
-				if err == customerrors.ErrInterrupt {
-					return
-				}
-				*responseData = append(*responseData, &Response{
-					Response: err.Error(),
-					Time:     completedTime,
-				})
-				increase <- 1
-				return
-			}
-
-			*responseData = append(*responseData, &Response{
-				Response: strconv.Itoa(response.StatusCode()),
-				Time:     completedTime,
-			})
-			increase <- 1
-		}()
-	}
-}

types/durations.go

@@ -1,41 +0,0 @@
-package types
-
-import (
-	"sort"
-	"time"
-)
-
-type Durations []time.Duration
-
-func (d Durations) Sort(ascending ...bool) {
-	// If ascending is provided and is false, sort in descending order
-	if len(ascending) > 0 && ascending[0] == false {
-		sort.Slice(d, func(i, j int) bool {
-			return d[i] > d[j]
-		})
-	} else { // Otherwise, sort in ascending order
-		sort.Slice(d, func(i, j int) bool {
-			return d[i] < d[j]
-		})
-	}
-}
-
-func (d Durations) First() *time.Duration {
-	return &d[0]
-}
-
-func (d Durations) Last() *time.Duration {
-	return &d[len(d)-1]
-}
-
-func (d Durations) Sum() time.Duration {
-	sum := time.Duration(0)
-	for _, duration := range d {
-		sum += duration
-	}
-	return sum
-}
-
-func (d Durations) Avg() time.Duration {
-	return d.Sum() / time.Duration(len(d))
-}

types/option.go

@@ -1,89 +0,0 @@
-package types
-
-import (
-	"encoding/json"
-	"errors"
-)
-
-type NonNilT interface {
-	~int | ~float64 | ~string | ~bool
-}
-
-type Option[T NonNilT] interface {
-	IsNone() bool
-	ValueOrErr() (T, error)
-	ValueOr(def T) T
-	ValueOrPanic() T
-	SetValue(value T)
-	SetNone()
-	UnmarshalJSON(data []byte) error
-}
-
-// Don't call this struct directly, use NewOption[T] or NewNoneOption[T] instead.
-type option[T NonNilT] struct {
-	// value holds the actual value of the Option if it is not None.
-	value T
-	// none indicates whether the Option is None (i.e., has no value).
-	none bool
-}
-
-func (o *option[T]) IsNone() bool {
-	return o.none
-}
-
-// If the Option is None, it will return zero value of the type and an error.
-func (o *option[T]) ValueOrErr() (T, error) {
-	if o.IsNone() {
-		return o.value, errors.New("Option is None")
-	}
-	return o.value, nil
-}
-
-// If the Option is None, it will return the default value.
-func (o *option[T]) ValueOr(def T) T {
-	if o.IsNone() {
-		return def
-	}
-	return o.value
-}
-
-// If the Option is None, it will panic.
-func (o *option[T]) ValueOrPanic() T {
-	if o.IsNone() {
-		panic("Option is None")
-	}
-	return o.value
-}
-
-func (o *option[T]) SetValue(value T) {
-	o.value = value
-	o.none = false
-}
-
-func (o *option[T]) SetNone() {
-	var zeroValue T
-	o.value = zeroValue
-	o.none = true
-}
-
-func (o *option[T]) UnmarshalJSON(data []byte) error {
-	if string(data) == "null" || len(data) == 0 {
-		o.SetNone()
-		return nil
-	}
-
-	if err := json.Unmarshal(data, &o.value); err != nil {
-		o.SetNone()
-		return err
-	}
-	o.none = false
-	return nil
-}
-
-func NewOption[T NonNilT](value T) *option[T] {
-	return &option[T]{value: value}
-}
-
-func NewNoneOption[T NonNilT]() *option[T] {
-	return &option[T]{none: true}
-}

utils/convert.go

@@ -1,85 +0,0 @@
-package utils
-
-import (
-	"encoding/json"
-	"fmt"
-	"reflect"
-)
-
-type TruncatedMarshaller struct {
-	Value    interface{}
-	MaxItems int
-}
-
-func (t TruncatedMarshaller) MarshalJSON() ([]byte, error) {
-	val := reflect.ValueOf(t.Value)
-
-	if val.Kind() != reflect.Slice && val.Kind() != reflect.Array {
-		return json.Marshal(t.Value)
-	}
-	if val.Len() == 0 {
-		return []byte("[]"), nil
-	}
-
-	length := val.Len()
-	if length <= t.MaxItems {
-		return json.Marshal(t.Value)
-	}
-
-	truncated := make([]interface{}, t.MaxItems+1)
-
-	for i := 0; i < t.MaxItems; i++ {
-		truncated[i] = val.Index(i).Interface()
-	}
-
-	remaining := length - t.MaxItems
-	truncated[t.MaxItems] = fmt.Sprintf("+%d", remaining)
-
-	return json.Marshal(truncated)
-}
-
-func PrettyJSONMarshal(v interface{}, maxItems int, prefix, indent string) []byte {
-	truncated := processValue(v, maxItems)
-	d, _ := json.MarshalIndent(truncated, prefix, indent)
-	return d
-}
-
-func processValue(v interface{}, maxItems int) interface{} {
-	val := reflect.ValueOf(v)
-
-	switch val.Kind() {
-	case reflect.Map:
-		newMap := make(map[string]interface{})
-		iter := val.MapRange()
-		for iter.Next() {
-			k := iter.Key().String()
-			newMap[k] = processValue(iter.Value().Interface(), maxItems)
-		}
-		return newMap
-
-	case reflect.Slice, reflect.Array:
-		return TruncatedMarshaller{Value: v, MaxItems: maxItems}
-
-	case reflect.Struct:
-		newMap := make(map[string]interface{})
-		t := val.Type()
-		for i := 0; i < t.NumField(); i++ {
-			field := t.Field(i)
-			if field.IsExported() {
-				jsonTag := field.Tag.Get("json")
-				if jsonTag == "-" {
-					continue
-				}
-				fieldName := field.Name
-				if jsonTag != "" {
-					fieldName = jsonTag
-				}
-				newMap[fieldName] = processValue(val.Field(i).Interface(), maxItems)
-			}
-		}
-		return newMap
-
-	default:
-		return v
-	}
-}

utils/int.go

@@ -1,21 +0,0 @@
-package utils
-
-type Number interface {
-	int | int8 | int16 | int32 | int64
-}
-
-func NumLen[T Number](n T) T {
-	if n < 0 {
-		n = -n
-	}
-	if n == 0 {
-		return 1
-	}
-
-	var count T = 0
-	for n > 0 {
-		n /= 10
-		count++
-	}
-	return count
-}

utils/print.go

@@ -1,24 +0,0 @@
-package utils
-
-import (
-	"fmt"
-	"os"
-
-	"github.com/fatih/color"
-)
-
-func PrintErr(err error) {
-	color.New(color.FgRed).Fprintln(os.Stderr, err.Error())
-}
-
-func PrintErrAndExit(err error) {
-	if err != nil {
-		PrintErr(err)
-		os.Exit(1)
-	}
-}
-
-func PrintAndExit(message string) {
-	fmt.Println(message)
-	os.Exit(0)
-}

utils/slice.go

@@ -1,50 +0,0 @@
-package utils
-
-import "math/rand"
-
-func Flatten[T any](nested [][]*T) []*T {
-	flattened := make([]*T, 0)
-	for _, n := range nested {
-		flattened = append(flattened, n...)
-	}
-	return flattened
-}
-
-func Contains[T comparable](slice []T, item T) bool {
-	for _, i := range slice {
-		if i == item {
-			return true
-		}
-	}
-	return false
-}
-
-// RandomValueCycle returns a function that cycles through the provided slice of values
-// in a random order. Each call to the returned function will yield a value from the slice.
-// The order of values is determined by the provided random number generator.
-//
-// The returned function will cycle through the values in a random order until all values
-// have been returned at least once. After all values have been returned, the function will
-// reset and start cycling through the values in a random order again.
-// The returned function isn't thread-safe and should be used in a single-threaded context.
-func RandomValueCycle[Value any](values []Value, localRand *rand.Rand) func() Value {
-	var (
-		clientsCount int = len(values)
-		currentIndex int = localRand.Intn(clientsCount)
-		stopIndex    int = currentIndex
-	)
-
-	return func() Value {
-		client := values[currentIndex]
-		currentIndex++
-		if currentIndex == clientsCount {
-			currentIndex = 0
-		}
-		if currentIndex == stopIndex {
-			currentIndex = localRand.Intn(clientsCount)
-			stopIndex = currentIndex
-		}
-
-		return client
-	}
-}

utils/time.go

@@ -1,14 +0,0 @@
-package utils
-
-import "time"
-
-func DurationRoundBy(duration time.Duration, n int64) time.Duration {
-	if durationLen := NumLen(duration.Nanoseconds()); durationLen > n {
-		roundNum := 1
-		for range durationLen - n {
-			roundNum *= 10
-		}
-		return duration.Round(time.Duration(roundNum))
-	}
-	return duration
-}

validation/validator.go

@@ -1,59 +0,0 @@
-package validation
-
-import (
-	"reflect"
-	"strings"
-
-	"github.com/go-playground/validator/v10"
-	"golang.org/x/net/http/httpguts"
-)
-
-// net/http/request.go/isNotToken
-func isNotToken(r rune) bool {
-	return !httpguts.IsTokenRune(r)
-}
-
-func NewValidator() *validator.Validate {
-	validation := validator.New()
-	validation.RegisterTagNameFunc(func(fld reflect.StructField) string {
-		if fld.Tag.Get("validation_name") != "" {
-			return fld.Tag.Get("validation_name")
-		} else {
-			return fld.Tag.Get("json")
-		}
-	})
-	validation.RegisterValidation(
-		"http_method",
-		func(fl validator.FieldLevel) bool {
-			method := fl.Field().String()
-			// net/http/request.go/validMethod
-			return len(method) > 0 && strings.IndexFunc(method, isNotToken) == -1
-		},
-	)
-	validation.RegisterValidation(
-		"string_bool",
-		func(fl validator.FieldLevel) bool {
-			s := fl.Field().String()
-			return s == "true" || s == "false" || s == ""
-		},
-	)
-	validation.RegisterValidation(
-		"proxy_url",
-		func(fl validator.FieldLevel) bool {
-			url := fl.Field().String()
-			if url == "" {
-				return false
-			}
-			if err := validation.Var(url, "url"); err != nil {
-				return false
-			}
-			if !(url[:7] == "http://" ||
-				url[:9] == "socks5://" ||
-				url[:10] == "socks5h://") {
-				return false
-			}
-			return true
-		},
-	)
-	return validation
-}