Listen to a subscriptiontopic with PubSub - Google Cloud Platform - Stack Overflow

I have a topic, and subscriptions related to it with pub/sub.

I'd like to test my function locally through VSCode, especially the function that triggers when a message is posted on my topic.

export const onPubSubMessage = onMessagePublished("projects/"id-of-project"/topics/"my-topic", (event) => {
    console.log('Message received')
  const message = event.data?.message;
  if (!message) {
    console.log("No message received");
    return;
  }

  const data = message.data ? Buffer.from(message.data, "base64").toString() : "{}";
  
  console.log("Message reçu :", data);
});

I've applied this function, but I don't see anything in my console, it's never triggered. However, I do see my messages in my subscription.

I have launched my emulator with functions & pubsub, and I can see in my console that my pubsub function is initialized.

I start my emulator with this command :

npm run build:watch

And in an other terminal, this is the script that I launch to start my emulator :

npm run build && firebase emulators:start --only functions,pubsub

My others functions running on the same configuration works, I just have issues to receive the message published on my topic.

Does anyone know why this is? How can I fix it?

I have a topic, and subscriptions related to it with pub/sub.

I'd like to test my function locally through VSCode, especially the function that triggers when a message is posted on my topic.

export const onPubSubMessage = onMessagePublished("projects/"id-of-project"/topics/"my-topic", (event) => {
    console.log('Message received')
  const message = event.data?.message;
  if (!message) {
    console.log("No message received");
    return;
  }

  const data = message.data ? Buffer.from(message.data, "base64").toString() : "{}";
  
  console.log("Message reçu :", data);
});

I've applied this function, but I don't see anything in my console, it's never triggered. However, I do see my messages in my subscription.

I have launched my emulator with functions & pubsub, and I can see in my console that my pubsub function is initialized.

I start my emulator with this command :

npm run build:watch

And in an other terminal, this is the script that I launch to start my emulator :

npm run build && firebase emulators:start --only functions,pubsub

My others functions running on the same configuration works, I just have issues to receive the message published on my topic.

Does anyone know why this is? How can I fix it?

• google-cloud-pubsub

Share Improve this question Follow asked Feb 4 at 8:24 Marie DufauMarie Dufau 1111 bronze badge 1

• Hello, who is responsible for triggering the function ? – Abdellatif Derbel Commented Feb 4 at 13:13

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1 Answer 1

Sorted by: Reset to default 0

Since it’s working on other functions, few factors for this behavior could be, there is a mismatch in the topic name, a small difference can prohibit the trigger to execute, check for the case sensitivity or even a whitespace could make a difference. Same project ID is a must also, verify if you have the same on both .firebaserc file and Pub/Sub Trigger topic. Also, try to clear the cache of the emulator at your firebase.