Node Js Query MySql Before Sending Notification in Firebase - mysql

Question

Please how do I Query MySql and wait for result before sending notification to device. Here is my code
exports.pushNotification = functions.database
.ref("/messages")
.onWrite((change, context) => {
console.log("Push notification event triggered");
const payload = {
notification: {
title: "Test Message",
body: "Welcome to Node",
sound: "default"
},
data: {
title: "Test Message",
message: "Welcome to Node"
}
};
/* Create an options object that contains the time to live for the notification and the priority. */
const options = {
priority: "high",
timeToLive: 60 * 60 * 24 //24 hours
};
var token = new Promise(function(resolve, reject) {
con.connect(function(err) {
if (err) {
reject(err);
} else {
con.query("SELECT fcm_token FROM users WHERE id = 24", function(
err,
result,
fields
) {
if (err) {
reject(err);
} else {
token = result[0].fcm_token;
resolve(token);
}
});
}
});
});
console.log("Token : " + token);
return admin.messaging().sendToDevice(token, payload, options);
});
I keep getting the following errors:

Answer 1

According to the documentation sendToDevice does not take a promise as a parameter. So you will have to call sendToDevice with the resolved token(s) instead and only then resolve/reject.
exports.pushNotification = functions.database
.ref("/messages")
.onWrite((change, context) => {
console.log("Push notification event triggered");
...
return new Promise(function(resolve, reject) {
con.connect(function(err) {
if (err) {
reject(err);
} else {
con.query("SELECT fcm_token FROM users WHERE id = 24", function(
err,
result,
fields
) {
if (err) {
reject(err);
} else {
token = result[0].fcm_token;
console.log("Token : " + token);
admin.messaging().sendToDevice(token, payload, options).then(function() {
resolve();
}).catch(function(err) {
reject(err);
});
}
});
}
});
});
});