streaming callable API: client aborted stream -> how to know on server?

[Obiwarn]

I am testing the new streaming API for cloud functions in emulator.
Aborting streams with an AbortController on my client works fine.

How can the called function know that the user canceled the stream? The CallableResponse signal does not fire an event.

I want to pass an abort signal to the AI API I am calling in the function.

export const aiStreamText = onCall<AiStreamTextRequest>(
  async (request, response) => {
    response?.signal.addEventListener("abort", () => {
      console.log(new Date().toISOString(), "on server: aborted by user");  // THIS DOES NOT FIRE ON ABORT
    });

Related issues

[REQUIRED] Version info

node:

firebase-functions:

firebase-tools:

firebase-admin:

[REQUIRED] Test case

[REQUIRED] Steps to reproduce

[REQUIRED] Expected behavior

[REQUIRED] Actual behavior

Were you able to successfully deploy your functions?

[google-oss-bot]

I found a few problems with this issue:

• I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.
• This issue does not have all the information required by the template. Looks like you forgot to fill out some sections. Please update the issue with more information.

[CorieW]

Hi @Obiwarn,

Thanks for reporting this issue! We’ve received it and are reviewing it. We’ll provide updates as soon as possible.

[CorieW]

After attempting this for myself, I'm not sure this is possible, however, I will raise internally to confirm. For now, I will leave a feature-request label.