CODEWITHSUNDEEP
typescriptfirebasefirebase-realtime-databasegoogle-cloud-functionsfirebase-cloud-messaging
Knowledge Seeker
Knowledge Seeker

Reputation: 566

Error in sending push notification in firebase cloud functions

I am trying to create a push notification with firebase cloud functions. Following is my code:

const admin = firebase
exports.sendNewTripNotification = functions.firestore
  .document('notifications/{notificationId}')
  .onWrite(async (event) => {
    console.log("event: ", event)
    const key = "cK0e5ZRAVRUAlx8hXHkNkXp7mj43"
    const ref = admin.database().ref(`users/${key}/deviceToken`);
    console.log("ref: ", ref)
    const deviceToken = admin.database().ref(`/users/${key}/deviceToken`).once('value');
    return deviceToken.then(result => {
      const token_id = result.val();
      console.log("token_id", token_id)
      const payload = {
        notification: {
          title: "Friend Request",
          body: "You just got a new friend request",
          icon: "default"
        }
      };
      console.log("payload", payload)
      return admin.messaging().sendToDevice(token_id, payload).then(Response => {
        console.log('this is the notification',Response)
      });
    });
  })

I'm getting the following error:

Error: Registration token(s) provided to sendToDevice() must be a non-empty string or a non-empty array. at FirebaseMessagingError.FirebaseError [as constructor] (/srv/node_modules/firebase-admin/lib/utils/error.js:42:28) at FirebaseMessagingError.PrefixedFirebaseError [as constructor] (/srv/node_modules/firebase-admin/lib/utils/error.js:88:28)

I did consult the following two links but got no help. Am I doing anything wrong here?

Firebase Cloud Functions get data on real time database onCreate

Firebase Cloud Functions Tokens

Upvotes: 0

Views: 738

Answers (2)

Knowledge Seeker
Knowledge Seeker

Reputation: 566

The issue has been fixed. I was doing a silly mistake. I wasn't overwriting device token on login in another device.

Upvotes: 0

Renaud Tarnec
Renaud Tarnec

Reputation: 83181

You are mixing the use of async/await with then(), which is not recommended. The following should do the trick (untested):

exports.sendNewTripNotification = functions.firestore
    .document('notifications/{notificationId}')
    .onWrite(async (event) => {
        console.log("event: ", event)

        const key = "cK0e5ZRAVRUAlx8hXHkNkXp7mj43"
        const ref = admin.database().ref(`users/${key}/deviceToken`);
        console.log("ref: ", ref)

        const deviceToken = await ref.once('value');
        const token_id = deviceToken.val();

        console.log("token_id", token_id)

        const payload = {
            notification: {
                title: "Friend Request",
                body: "You just got a new friend request",
                icon: "default"
            }
        };

        const messagingDevicesResponse = await admin.messaging().sendToDevice(token_id, payload);

        console.log('this is the notification', messagingDevicesResponse)

        return null;

    })

Upvotes: 0

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