connectTimeout not working if network connection is not available.

[fahadshakeel1989]

[READ] Step 1: Are you in the right place?

Yes

[REQUIRED] Step 2: Describe your environment

• Operating System version: Linux
• Firebase SDK version: 6.8.1
• Library version: firebase-admin
• Firebase Product: Push Notification

[REQUIRED] Step 3: Describe the problem

connectTimeout configured in FirebaseOptions object is not working if network connection is not available. Getting SocketTimeoutException once default http connect timeout occurs i.e. 60 seconds.

Steps to reproduce:

1. Configure connectTimeout in FirebaseOptions object.
2. Initialize FirebaseApp instance.
3. Get FirebaseMessaging instance.
4. Call send() method.

Relevant Code:

InetSocketAddress inetSocketAddress = new InetSocketAddress(proxy_ip, proxy_port);

HttpTransport httpTransport = new NetHttpTransport.Builder()
        .setProxy(new Proxy(Proxy.Type.HTTP, inetSocketAddress))
        .build();

HttpTransportFactory httpTransaportFactory = new HttpTransportFactory() {
        @Override
        public HttpTransport create() {
                return httpTransport
        }
};

GoogleCredentials googleCredentials = GoogleCredentials.fromStream(serviceAccount, httpTransaportFactory);

FirebaseOptions firebaseOptions = new FirebaseOptions.Builder()
        .setCredentials(googleCredentials)
        .setHttpTransport(httpTransport)
        .setConnectTimeout(2*1000)
        .setReadTimeout(3*1000)
        .build();

FirebaseApp firebaseApp = FirebaseApp.initializeApp(firebaseOptions);

FirebaseMessaging.getInstance(firebaseApp).send(message);

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[hiranya911]

I ran into this recently myself. This is because the connect timeout setting in FirebaseOptions does not effect the transport used by GoogleCredentials (the very first request made by the SDK is through GoogleCredentials to fetch access tokens). And I don't see a straight forward way to set a timeout for GoogleCredentials either.

[hiranya911]

I just filed googleapis/google-auth-library-java#356 regarding this.

I've also learned that GoogleCredentials retries requests 10 times with exponential backoff. So in the event of a complete network outage, all the delay you're seeing is caused by these delayed retries.

[hiranya911]

Closing in favor of the issue filed at upstream google-auth repo.