👀 Views: 61 💬 Answers: 1 📅 Created: 2025-06-10

gcp pubsub python Python

Hey everyone, I'm running into an issue that's driving me crazy. I'm working with an scenario with my GCP Pub/Sub setup where messages are not being processed after I applied a subscription filter. I configured a subscription to filter messages by a specific attribute using the following command: ```bash gcloud pubsub subscriptions create my-subscription --topic my-topic --filter="attributes.type='important'" ``` After the filter was applied, I noticed that messages that do not meet the criteria seem to be sent to the dead-letter topic as expected. However, messages that do match the filter are never acknowledged, and they seem to disappear from the subscription without being processed. I'm using the Pub/Sub client library for Python (version 2.7.2). My subscriber code looks like this: ```python from google.cloud import pubsub_v1 subscriber = pubsub_v1.SubscriberClient() subscription_path = subscriber.subscription_path('my-project-id', 'my-subscription') def callback(message): print(f'Received message: {message.data}') message.ack() 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() ``` I have confirmed that messages with the correct attribute are being published to the topic since I can see them in the topic metrics, but they are not being picked up by my subscriber. There are no explicit behavior messages in the logs, and the subscriber seems to be running fine without exceptions. I've also checked the IAM permissions and confirmed that the service account has roles/pubsub.subscriber access. Is there something I might be missing with the subscription filtering or acknowledgement process that could be causing this scenario? I'm working on a REST API that needs to handle this. Any advice would be much appreciated.