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pkg/utils/env.go

@@ -0,0 +1,50 @@
+package utils
+
+import (
+	"fmt"
+	"os"
+)
+
+// GetEnv retrieves the environment variable named by the key envName,
+// and attempts to parse its value into the specified type T.
+//
+// It returns the parsed value of type T and a nil error on success.
+// It returns a zero value of type T and an error if the environment
+// variable is not set, or if parsing fails using the ParseValue function.
+func GetEnv[T any](envName string) (T, error) {
+	var zero T
+
+	envStr := os.Getenv(envName)
+	if envStr == "" {
+		return zero, fmt.Errorf("environment variable %s is not set", envName)
+	}
+
+	parsedEnv, err := ParseString[T](envStr)
+	if err != nil {
+		return zero, fmt.Errorf("failed to parse environment variable %s: %s", envName, err)
+	}
+
+	return parsedEnv, nil
+}
+
+// GetEnvOr retrieves the environment variable named by the key envName,
+// and attempts to parse its value into the specified type T.
+//
+// It returns the parsed value of type T and a nil error on success.
+// If the environment variable is not set, it returns the provided default value
+// and a nil error. If parsing fails, it returns a zero value of type T and an error.
+func GetEnvOr[T any](envName string, defaultValue T) (T, error) {
+	var zero T
+
+	envStr := os.Getenv(envName)
+	if envStr == "" {
+		return defaultValue, nil
+	}
+
+	parsedEnv, err := ParseString[T](envStr)
+	if err != nil {
+		return zero, fmt.Errorf("failed to parse environment variable %s: %s", envName, err)
+	}
+
+	return parsedEnv, nil
+}