Firebase 云消息传递应用程序出现超时错误

Question

我们使用 https://firebase.google.com/docs/cloud-messaging/send-message 中的以下实现通过 Firebase Cloud Messaging 发送消息，但在 FCM-PROD 环境中，我们收到以下超时异常：

2021-05-06T12:12:24.242Z    7da528c7-b898-4b0b-9624-c4b6e26bdf58    INFO    2021-05-06T12:12:24.242Z [DEBUG] firebasePushNotification >> [DEBUG] - [firebaseMessenger.sendMulticast] - Start :: "2021-05-06T12:12:24.242Z"
END RequestId: 7da528c7-b898-4b0b-9624-c4b6e26bdf58
REPORT RequestId: 7da528c7-b898-4b0b-9624-c4b6e26bdf58  Duration: 20020.44 ms   Billed Duration: 20000 ms   Memory Size: 128 MB Max Memory Used: 50 MB  
2021-05-06T12:12:39.485Z 7da528c7-b898-4b0b-9624-c4b6e26bdf58 Task timed out after 20.02 seconds

是什么导致了这个超时以及如何避免这个错误？

这是我们使用的代码：

const admin = require("firebase-admin");

const db = require('../lib/dbHelper');

const config = require("../config");

// ### export
var firebase = {};
module.exports = firebase;

// ### config
var firebaseCreds = config.FIREBASE_SERVICE_ACCOUNT;

admin.initializeApp({
    credential: admin.credential.cert(firebaseCreds)
});

const firebaseMessenger = admin.messaging();



firebase.sendPushNotificationToDevices = async function (tokenList, text, data, title, category) {


    if (category) {
        data.category = category;
    }
    var payload = {
        tokens: tokenList,
        "notification": {
            "title": title,
            "body": text
        },
        data: data,
        android: {
            notification: {
                click_action: "SplashActivity"
            }
        },
        apns: {
            payload: {
                aps: {
                    category: category
                }
            }
        },
        content_available: true,
        mutable_content: true
    };
    
    console.log("[Integration Testing] - Entire FCM payload :: %j", payload);
    
    try {
        // sends pushNotification to registered devices using Firebase's default messaging app
        
        console.log("[DEBUG] - firebaseMessenger.sendMulticast - Start :: %j", new Date().toISOString());
        const response = await firebaseMessenger.sendMulticast(payload);
        console.log("[DEBUG] - firebaseMessenger.sendMulticast - End :: %j", new Date().toISOString());
        
        
        return {
        statusCode: 202,
        headers: {'content-type': 'application/json'},
        body: JSON.stringify(response)
    };

        
    } catch (err) {
        console.log("[sendPushNotificationToDevices] Error Occured due to :: %j", err);
        
        return {
        statusCode: 400,
        headers: {'content-type': 'application/json'},
        body: JSON.stringify(err.description || err)
    };
        
    }
    
};