Added peridoic email sender with Celery

src/series/tasks.py

@@ -0,0 +1,79 @@
+from celery import shared_task
+from account.models import User
+from requests import get
+from datetime import datetime
+from django.template.loader import render_to_string
+from django.core.mail import EmailMessage
+from celery.utils.log import get_task_logger
+
+
+logger = get_task_logger(__name__)
+
+def get_request(link):
+    raw_data = get(link)
+
+    if raw_data.status_code == 200:
+        data = raw_data.json()
+        if not data['errorMessage']:
+            return data
+        logger.info(f"error message: {data['errorMessage']}\nlink: {link}")
+        return None
+    logger.info(f"status code: {raw_data.status_code}\nlink: {link}")
+
+def episode_counter(imdb_api_key, s, data):
+    now_date = datetime.strptime(datetime.strftime(datetime.utcnow(),'%d %b %Y'), '%d %b %Y')
+    new_episodes_count = 0
+
+    for n in data['tvSeriesInfo']['seasons'][data['tvSeriesInfo']['seasons'].index(str(s.last_season)):]:
+        data = get_request(f"https://imdb-api.com/en/API/SeasonEpisodes/{imdb_api_key}/{s.imdb_id}/{n}")
+        if data is None: return None
+
+        episodes = data['episodes']
+        for i in range(int(s.last_episode) if n == str(s.last_season) else 0, len(episodes)):
+            released_date = episodes[i]['released'].replace('.', '')
+            try:
+                episode_date = datetime.strptime(released_date, '%d %b %Y')
+                if (episode_date - now_date).days > 0:
+                    raise ValueError
+            except ValueError: 
+                return new_episodes_count, int(last_n)+1, last_i+1 if new_episodes_count > 0 else 0, 0, 0
+            last_i = i
+            new_episodes_count += 1
+        last_n = n
+
+    return new_episodes_count, n, i+1 if new_episodes_count > 0 else 0, 0, 0
+
+@shared_task(name='send_emails')
+def send_feedback_email_task():
+    users = User.objects.filter(email_notification_is_active=True)
+    for user in users:
+        series = user.series.filter(show=True).order_by('-id')
+        series_new_episodes = []
+
+        for s in series:
+            data = get_request(f"https://imdb-api.com/en/API/Title/{user.imdb_api_key}/{s.imdb_id}")
+
+            if data is None:
+                series_new_episodes = []
+                break
+            data = episode_counter(user.imdb_api_key, s, data)
+            if data is None:
+                series_new_episodes = []
+                break
+
+            if data[0]:
+                series_new_episodes.append([s,
+                    {'count': data[0],
+                    'last_season': data[1],
+                    'last_episode': data[2]}
+                    ])
+
+        if series_new_episodes:
+            message = render_to_string('new_episodes_verification.html', {
+                'user': user,
+                'data': series_new_episodes
+            })
+            email = EmailMessage(
+                'New Episodes!', message, to=[user.email]
+            )
+            email.send()

src/series/templates/new_episodes_verification.html

@@ -0,0 +1,9 @@
+{% autoescape off %}  
+
+Hi {{ user.username }},  
+There are new episodes of the series you recorded.
+{% for s, d in data %}
+{{d.count}} episodes of {{s.title}} you haven't watched (watched episode: {{s.last_season}} - {{s.last_episode}}).
+{% endfor %}
+
+{% endautoescape %}