sending email async with celery

celery_worker.py

@@ -0,0 +1,51 @@
+from celery import Celery
+from flask import current_app
+import os
+import logging
+
+# Configure logging
+logger = logging.getLogger(__name__)
+
+# Get Redis URL from environment variable or use default
+REDIS_URL = os.getenv('REDIS_URL', 'redis://localhost:6379/0')
+
+# Configure Celery
+celery = Celery(
+    'docupulse',
+    backend=REDIS_URL,
+    broker=REDIS_URL,
+    # Add some default configuration
+    task_serializer='json',
+    accept_content=['json'],
+    result_serializer='json',
+    timezone='UTC',
+    enable_utc=True,
+    # Add retry configuration
+    task_acks_late=True,
+    task_reject_on_worker_lost=True,
+    task_default_retry_delay=300,  # 5 minutes
+    task_max_retries=3
+)
+
+def init_celery(app):
+    """Initialize Celery with Flask app context"""
+    celery.conf.update(app.config)
+
+    class ContextTask(celery.Task):
+        """Celery task that runs within Flask app context"""
+        def __call__(self, *args, **kwargs):
+            with app.app_context():
+                return self.run(*args, **kwargs)
+
+        def on_failure(self, exc, task_id, args, kwargs, einfo):
+            """Handle task failure"""
+            logger.error(f'Task {task_id} failed: {exc}')
+            super().on_failure(exc, task_id, args, kwargs, einfo)
+
+        def on_retry(self, exc, task_id, args, kwargs, einfo):
+            """Handle task retry"""
+            logger.warning(f'Task {task_id} is being retried: {exc}')
+            super().on_retry(exc, task_id, args, kwargs, einfo)
+
+    celery.Task = ContextTask
+    return celery