Firebase的云功能突然超时(Cloud Functions for Firebase suddenly timing out)

 在今天部署我的功能之后突然间，我们的一些功能突然总是超时。 我在云功能控制台中看到了这一点。 这似乎发生在嵌套和返回承诺时。 奇怪的是，这从未发生过。 
 
 这是我的代码。 
 
exports.pushMessageQueue = functions.database.ref('/userPushMessagesQueue/{userId}/{messageId}').onWrite(event => {
    if (!event.data.exists()) {
        console.log('DOES NOT EXIST!');
        return "not exists";
    }

    console.log("EXISTS!");

    const userId = event.params['userId'];
    const messageId = event.params['messageId'];

    const payload = event.data.val();

    return database.ref('devices').orderByChild('user_id').equalTo(userId).once('value', snapshot => {
        if (!snapshot.exists()) {
            return "no devices found";
        }

        const devices = snapshot.val();

        const deviceTokens = [];

        snapshot.forEach(deviceSnap => {
            const device = deviceSnap.val();
            deviceTokens.push(device['fcm_key']);
        });

        const removeFromQueue = database.ref(`/userPushMessagesQueue/${userId}/${messageId}`);

        console.log('then0');

        return removeFromQueue.set(null).then(() => {
            console.log('then1');
            return admin.messaging().sendToDevice(deviceTokens, payload).then(() => {
                console.log('then2');
                return "send";
            });
        }, (error) => {
            console.log('error1!');
            console.log(error);
        });
    });
});
 
 在控制台中，将记录then0，而不是then1然后是2。 当我收到推送通知时，该条目将从队列中删除。 
 
 有什么我做错了吗？ 

Suddenly after deploying my functions today some of our functions suddenly always timeout. I see this in the cloud functions console. This seems to happen when nesting and returning promises. Strange thing is this never happened before.
 
Here's my code.
 
exports.pushMessageQueue = functions.database.ref('/userPushMessagesQueue/{userId}/{messageId}').onWrite(event => {
    if (!event.data.exists()) {
        console.log('DOES NOT EXIST!');
        return "not exists";
    }

    console.log("EXISTS!");

    const userId = event.params['userId'];
    const messageId = event.params['messageId'];

    const payload = event.data.val();

    return database.ref('devices').orderByChild('user_id').equalTo(userId).once('value', snapshot => {
        if (!snapshot.exists()) {
            return "no devices found";
        }

        const devices = snapshot.val();

        const deviceTokens = [];

        snapshot.forEach(deviceSnap => {
            const device = deviceSnap.val();
            deviceTokens.push(device['fcm_key']);
        });

        const removeFromQueue = database.ref(`/userPushMessagesQueue/${userId}/${messageId}`);

        console.log('then0');

        return removeFromQueue.set(null).then(() => {
            console.log('then1');
            return admin.messaging().sendToDevice(deviceTokens, payload).then(() => {
                console.log('then2');
                return "send";
            });
        }, (error) => {
            console.log('error1!');
            console.log(error);
        });
    });
});
 
In the console then0 is logged, not then1 and then2. And that while I receive the push notification and the entry is removed from the queue.
 
Is there something I am doing wrong?

原文：https://stackoverflow.com/questions/43098952