Firebase functions cloud messaging notification not being recieved-CodePudding

When I send a notification from the Firebase cloud messaging console, my device receives it without a problem, but when I send it via a cloud functions, the function log says it was successfully sent but my device does not receive it. I tried switching to type script, sending the notification with different conditions but nothing works. The app is written in flutter.

My function code:

exports.sendNotification = functions.https.onRequest((request, response) => {
    const db = admin.firestore();
    const fcm = admin.messaging();
    db.collection("users")
        .where("bananas", "==", 1666).get().then(
            (result) => {
                if (result.size > 0) {
                    result.forEach((doc) => {
                          const payload = {
                            token: doc.data().NotToken,
                            notification: {
                              title: "iam a notification",
                              body: "Yay",
                              icon: "https://cdn1.iconfinder.com/data/icons/logos-brands-in-colors/231/among-us-player-white-512.png",
                            },
                          };
                          fcm.send(payload).then((response) => {
                            // Response is a message ID string.
                            console.log("Successfully sent message: " 
                            doc.data().NotToken  "  ", response);
                            return {success: true};
                        }).catch((error) => {
                            return {error: error.code};
                        });
                    });
                }
            });
    response.send("Notification sent !");
    functions.logger.info("Notification sent!");
    return null; 
});

cloud log

Any ideas?

CodePudding user response：

Did you notice how your code never logs this message?

Successfully sent message

That's because both loading from Firestore, and sending messaging through Cloud Messaging are asynchronous calls. So your response.send("Notification sent !") runs before the data is ever retrieved from the database, and Cloud Functions at that point terminates your code to prevent charging after you say that you are done.

If you have asynchronous operations in your code, you need to return a promise from the top-level of your code that resolves/rejects when all asynchronous code has completed. So in your case that means the promise should only resolve once you've loaded the data from Firestore, and sent the messages.

Let's start with a simple example. Say that you want to only send a single message, no matter how many documents are in the database.

exports.sendNotification = functions.https.onRequest((request, response) => {
    const db = admin.firestore();
    const fcm = admin.messaging();
    return db.collection("users") //