Bulk notifications using firebase cloud functions react native

Question

I'm new on notifications with firebase and Cloud Functions and wondering if even using CF where servers are managed by Firebase's teams and has autoscale, is there a chance, if I was sending 100.000 notifications to my users, to crash my application?

I'm doing something like that:

Someone on the app made a post;
On my CF has a trigger to send notifications for the users;
Then, all users (100.000) received the notifications.

Is Firebase infrastructure has queue or job manage to avoid this kind of situations or can I sleep well like a babe?

Here a snippet of my code:

exports.newPost = functions.database.ref("post/{postId}")
    .onUpdate((change, context) => {
        const before = change.before.val();
        const after = change.after.val();

        if (before.status === after.status) {
            return null;
        }

        const ref = admin.database().ref(`tokens/`);
        return ref.orderByKey().once("value", async snapshot => {

            const fcmTokens = snapshotToArray(snapshot);

            admin.messaging()
                .sendMulticast({
                    data: {},
                    tokens: fcmTokens,
                    notification: {
                        title: 'Title',
                        body: 'Body',
                    },
                    android: {
                        notification: {
                            image: imageUrl,
                        },
                    },
                    apns: {
                        payload: {
                            aps: {
                                "mutable-content": 1,
                            },
                        },
                        fcm_options: {
                            image: imageUrl,
                        },
                    },
                })
                .then(resp => console.log(resp))
                .catch(e => console.log(e))
        })
    })

My questions is: Is there a possible problem with my code?

I'm unclear what your concern is here. FCM sends billions of notifications daily and there are no problems with that, in a general sense. — Doug Stevenson
– Doug Stevenson, Commented Dec 2, 2020 at 17:11
I still don't really understand the problem you are anticipating. — Doug Stevenson
– Doug Stevenson, Commented Dec 2, 2020 at 18:57
@DougStevenson, I'd like to know if I send one notification to a hundred thousand users using Cloud Functions with FCM, my backend will handle it without crash my application? I'm using that snippet code.. — C-lio Garcia
– C-lio Garcia, Commented Dec 2, 2020 at 19:33

Doug Stevenson · Accepted Answer · 2020-12-02 19:58:58Z

3

There is nothing inherently "bad" with the code you're showing here. FCM regularly sends billions of notifications daily. The hardest part of that isn't even handled by the code you show here - it's handled by FCM servers. The code here is just telling the servers to send those messages, which is requires extremely low effort.

answered Dec 2, 2020 at 19:58

Doug Stevenson

321k37 gold badges458 silver badges474 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

C-lio Garcia Over a year ago

Is FCM theres no trigger limitation of number of notifications?

Doug Stevenson Over a year ago

I'm not really sure what you're asking. The limits of FCM are well documented and have nothing to do with Cloud Functions. firebase.google.com/docs/cloud-messaging/concept-options

Owais ul wara · Accepted Answer · 2022-01-17 02:45:18Z

0

The only problem I could see here is the limit to the tokens which can cause the failure of notifications to be delivered.

You’re using sendMulticast which accepts up to 500 FCM Tokens per invocation.

https://firebase.google.com/docs/cloud-messaging/send-message

answered Jan 17, 2022 at 2:45

Owais ul wara

511 silver badge8 bronze badges

Collectives™ on Stack Overflow

Bulk notifications using firebase cloud functions react native

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related