Emulator error `Error: socket hang up`

[jhuleatt]

On my m1 mac, I get the following error when emulating a function with the BigQuery python SDK:

>  objc[122]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called.
>  objc[122]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.
⬢  functions: Failed to handle request for function us-central1-commontrees
⬢  functions: Failed to start functions in /Users/jhuleatt/projects/io-python/functions: Error: socket hang up

here's the function code:

from firebase_functions import https_fn
from google.cloud import bigquery
import json

@https_fn.on_request(timeout_sec=20)
def commontrees(req: https_fn.Request) -> https_fn.Response:
    client = bigquery.Client()
    query = """
        SELECT spc_latin, spc_common, COUNT(spc_latin) as num_specimens
        FROM `bigquery-public-data.new_york_trees.tree_census_2015`
        WHERE SPC_LATIN <> ''
        GROUP BY spc_latin, spc_common
        ORDER BY num_specimens DESC
        LIMIT 50
    """
    query_job = client.query(query)

    common_trees = [];
    for row in query_job:
        common_trees.append({
            "scientificName": row['spc_latin'],
            "commonName": row['spc_common'],
            "count": row['num_specimens']
        })
    return https_fn.Response(json.dumps(common_trees),  mimetype='application/json')

[jhuleatt]

It seems like this might be specific to MacOS. Following the advice in this StackOverflow answer fixes the issue, but I'm not sure if it is something we want to recommend.

[jamescash]

Having the same issue. Above solution did not work for me.

  >  objc[61886]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called.
  >  objc[61886]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called. 
 We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on 
 objc_initializeAfterForkError to debug.

---

` from firebase_functions import firestore_fn, https_fn
from firebase_admin import initialize_app, firestore
import google.cloud.firestore
from langchain.llms import OpenAI

app = initialize_app()

@https_fn.on_request()
def askQuestion(req: https_fn.Request) -> https_fn.Response:

    projectId = req.args.get("projectId")
    prompt = req.args.get("prompt")

    if projectId is None:
        return https_fn.Response("No projectId", status=400)
    if prompt is None:
        return https_fn.Response("No projectId", status=400)

    llm = OpenAI(temperature=0)
    print(llm(prompt))

    return https_fn.Response(f"Success!", status=200) `

[jamescash]

@jhuleatt Do you mind sharing your fix? This is not working for me:

import os os.environ['OBJC_DISABLE_INITIALIZE_FORK_SAFETY'] = 'YES'

[taeold]

Starting the emulator with this option does the trick for me:

export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES

[exaby73]

@jhuleatt Could you provide a reproducible example so that I may test this further?

[peterfriese]

I'm running into the same issue.

To repro, create a new Firebase Function module (using firebase init functions, and then change the code for on_request_example like this:

import requests

@https_fn.on_request()
def on_request_example(req: https_fn.Request) -> https_fn.Response:
  response = requests.get("https://www.google.com")
  return https_fn.Response("Hello world!")

This results in the following output:

⬢  functions: Failed to handle request for function us-central1-on_request_example
⬢  functions: Failed to start functions in helloworld: Error: socket hang up

[exaby73]

Hello @peterfriese. Unfortunately, I am not able to reproduce this issue. I tried the following code:

import requests
from firebase_functions import https_fn, options
from firebase_admin import initialize_app

options.set_global_options(max_instances=10)

initialize_app()

@https_fn.on_request()
def on_request_example(req: https_fn.Request) -> https_fn.Response:
    response = requests.get("https://www.example.com") # Tried with google.com as well
    return https_fn.Response("Hello world!")

The following is my requirements.txt:

firebase-functions==0.1.1

My python version is Python 3.11.4

[arcoyk]

Solved same kind of error by overwriting the unused function.

import requests

@https_fn.on_request()
def the_deleted_function_name(req: https_fn.Request) -> https_fn.Response:
  pass

It seems emulator tries to find cached function that doesn't exist.

[antont]

@exaby73

Unfortunately, I am not able to reproduce this issue. I tried the following code:

Did you try on a Mac? I think I'm also using that OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES

[exaby73]

@antont I am on an M1 mac, without the OBJC_DISABLE_INITIALIZE_FORK_SAFETY flag set

[antont]

@exaby73 I am on an M1 mac, without the OBJC_DISABLE_INITIALIZE_FORK_SAFETY flag set

Ok. After OS upgrade and related restart, I didn't have the env var back yet, and again got that:

>  objc[26098]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called.
>  objc[26098]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.
i  Request to function failed: Error: socket hang up

Then setting the flag fixed it.

I'll keep this env now so can provide details about versions etc. later if that helps.

[exaby73]

Hey @antont. I'm wondering if you can reproduce this using Node as well. Since I can't reproduce this myself, I am unable to confirm it

[google-oss-bot]

Hey @jhuleatt. We need more information to resolve this issue but there hasn't been an update in 7 weekdays. I'm marking the issue as stale and if there are no new updates in the next 3 days I will close it automatically.

If you have more information that will help us get to the bottom of this, just add a comment!

[google-oss-bot]

Since there haven't been any recent updates here, I am going to close this issue.

@jhuleatt if you're still experiencing this problem and want to continue the discussion just leave a comment here and we are happy to re-open this.

[AgaMiko]

Exporting those two variables fixed the problem for me:

export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
export no_proxy=*

[b0ot]

Still an issue with me and my M1 Mac.

Going to try a couple of the fixes, don't really have a short example to reproduce.

EDIT: export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES Allowed the emulator python cloud function to work

[gregfenton]

Is this now documented somewhere?

Am I correct to summarize this as:

• MacOS
• M1 chip (M2? M3? Intel?)
• running Python cloud functions in the Emulator Suite
• need to set env var export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES in order for the (Python engine ??) to run properly

[b0ot]

Am I correct to summarize this as:

• MacOS
• M1 chip (M2? M3? Intel?)
• running Python cloud functions in the Emulator Suite
• need to set env var export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES in order for the (Python engine ??) to run properly

Yes that is correct, at least for my case (Macbook Air, M1, 2020) Until I set that export, I was unable to have my python cloud functions run successfully in the Firebase Emulator.