👀 Views: 35 💬 Answers: 1 📅 Created: 2025-06-01

google-cloud cloud-functions pubsub javascript

I'm maintaining legacy code that I'm upgrading from an older version and I'm working on a project and hit a roadblock....... I'm trying to set up a Google Cloud Function that is supposed to trigger from a Pub/Sub topic, but I'm getting a persistent 'Failed to connect' behavior in the logs. The function is written in Node.js 14.x and is supposed to process messages from a topic named `my-topic`. Here’s the relevant code for the function: ```javascript const {PubSub} = require('@google-cloud/pubsub'); exports.myFunction = async (event, context) => { const pubSubMessage = event.data; const message = Buffer.from(pubSubMessage, 'base64').toString(); console.log(`Received message: ${message}`); }; ``` I have enabled the Pub/Sub API and granted the necessary permissions to the Cloud Function's service account, allowing it to access the topic. I also set the trigger for the function to `my-topic`. My deployment command was: ```bash gcloud functions deploy myFunction --trigger-topic my-topic --runtime nodejs14 --allow-unauthenticated ``` However, when I publish a message to the topic, I see the following behavior in the logs: ``` [behavior] Failed to connect to Pub/Sub topic: my-topic ``` I double-checked that the topic exists and that the function is deployed successfully. I also tested the function independently by invoking it directly, which works as expected. However, the Pub/Sub trigger seems to be the scenario. I’ve tried redeploying the function and even recreated the topic, but the behavior continues. Any ideas on what might be going wrong or what additional permissions might be required? I'm working on a API that needs to handle this. What's the best practice here? The project is a desktop app built with Javascript. Any help would be greatly appreciated! I'm working on a mobile app that needs to handle this.