👀 Views: 92 💬 Answers: 1 📅 Created: 2025-06-09

gcp pubsub google-cloud-python Python

I can't seem to get I'm confused about I'm working on a project and hit a roadblock. I recently migrated an application from a legacy Google Cloud project to a new project environment within GCP. After setting up the Pub/Sub topics and subscriptions, I noticed that messages are not being delivered to my subscribers. I have verified that the IAM roles are correctly assigned and the service account has the necessary permissions. During the migration, I used the following configurations for the Pub/Sub subscription: ```yaml name: projects/my-new-project/subscriptions/my-subscription topic: projects/my-new-project/topics/my-topic ackDeadlineSeconds: 10 retainAckedMessages: true messageRetentionDuration: 604800s ``` After deploying the application, I confirmed that messages are being published to the topic using the following code snippet: ```python from google.cloud import pubsub_v1 project_id = 'my-new-project' topic_id = 'my-topic' topic_path = f'projects/{project_id}/topics/{topic_id}' publisher = pubsub_v1.PublisherClient() for i in range(10): data = f'Message {i}'.encode('utf-8') future = publisher.publish(topic_path, data) print(f'Published {data} to {topic_id} with message ID {future.result()}') ``` Despite successfully publishing messages, my subscriber code does not seem to receive any messages. Here’s how I set up the subscriber: ```python from google.cloud import pubsub_v1 project_id = 'my-new-project' subscription_id = 'my-subscription' subscription_path = f'projects/{project_id}/subscriptions/{subscription_id}' def callback(message): print(f'Received message: {message.data}') message.ack() subscriber = pubsub_v1.SubscriberClient() streaming_pull_future = subscriber.subscribe(subscription_path, callback=callback) print(f'Listening for messages on {subscription_path}...') try: streaming_pull_future.result() except KeyboardInterrupt: streaming_pull_future.cancel() except Exception as e: print(f'Error receiving messages: {e}') ``` I also checked the Pub/Sub dashboard, and the subscription shows that it's pulling messages, but the callback function is never triggered. I've tried re-creating the subscription and topic several times, but the issue persists. Are there any additional settings or troubleshooting steps I should consider? Any help would be greatly appreciated! I'm working on a API that needs to handle this. Is there a better approach? Thanks for taking the time to read this! The stack includes Python and several other technologies. Am I approaching this the right way? My team is using Python for this microservice.