Question

我是Typescript的新手，我试图使用async和await功能。我偶尔会得到一些fcm网络超时，我认为这与未正确回复我的承诺有关。

这是我发送推送通知的云功能。使用await关键字的两个函数是incrementBadgeCount和sendPushNotification：

export const pushNotification = functions.firestore
  .document('company/{companyId}/message/{messageId}/chat/{chatId}')
  .onCreate(async event => {

const message = event.data.data();
const recipients = event.data.data().read;
const messageId = event.params.messageId;

const ids = [];
for (const key of Object.keys(recipients)) {
    const val = recipients[key];
    if (val === false) {
        ids.push(key);
    }
}

return await Promise.all(ids.map(async (id) => {
    const memberPayload = await incrementBadgeCount(id);
    const memberBadgeNumberString = 
      memberPayload.getBadgeCount().toString();

    const senderName = message.sender.name;
    const senderId = message.sender.id;
    const senderMemberName = message.senderMember.name;
    const toId = message.receiver.id;
    const text = message.text;
    const photoURL = message.photoURL;
    const videoURL = message.videoURL;
    const dealId = message.dealId;
    const dealName = message.dealName;

    const payload = {
        notification: {
          title: `${senderName}`,
          click_action: 'exchange.booth.message',
          sound: 'default',
          badge: memberBadgeNumberString
        },
        data: { senderId, toId, messageId }
    };

    const options = {
        contentAvailable: true
    }

    ........

    const deviceIDs = memberPayload.getDeviceID()
    return await sendPushNotification(id, deviceIDs, payload, options);
  }));
});

这是incrementBadgeCount函数，它增加了有效负载的徽章数，并返回有效负载的一些信息：

async function incrementBadgeCount(memberID: string): 
  Promise<MemberPushNotificaitonInfo> {
const fs = admin.firestore();
const trans = await fs.runTransaction(async transaction => {
    const docRef = fs.doc(`member/${memberID}`);
    return transaction.get(docRef).then(doc => {
            let count: number = doc.get('badgeCount') || 0;
            const ids: Object = doc.get('deviceToken');
            transaction.update(docRef, {badgeCount: ++count});
            const memberPayload = new MemberPushNotificaitonInfo(count, ids);
            return Promise.resolve(memberPayload);
    });
});
return trans
}

最后是sendPushNotification函数，它与FCM接口并关闭有效负载并清除坏设备令牌：

async function sendPushNotification(memberID: string, deviceIDs: string[], payload: any, options: any) {
if (typeof deviceIDs === 'undefined') {
    console.log("member does not have deviceToken");
    return Promise.resolve();
}

const response = await admin.messaging().sendToDevice(deviceIDs, payload, options);
const tokensToRemove = [];
response.results.forEach((result, index) => {
    const error = result.error;
    const success = result.messageId;
    if (success) {
        console.log("success messageID:", success);
        return 
    }
    if (error) { 
        const failureDeviceID = deviceIDs[index];
        console.error(`error with ID: ${failureDeviceID}`, error);

        if (error.code === 'messaging/invalid-registration-token' ||
            error.code === 'messaging/registration-token-not-registered') {
            const doc = admin.firestore().doc(`member/${memberID}`);
             tokensToRemove.push(doc.update({
                deviceToken: {
                    failureDeviceID: FieldValue.delete()
                }
            }));
        }
    }
});

return Promise.all(tokensToRemove);
}

我会很感激有关收紧这些打字稿的一些帮助：）

Answer 1

最有可能的是，你在firebase api上调用的函数应该是await，但事实并非如此。我不熟悉firebase，告诉你它究竟是哪一个，但似乎任何对firebase API的调用都可能await。

这是确保为firebase安装类型定义并使用好的编辑器的地方。查看所有的firebase调用并确保它们都没有秘密返回承诺。

此外，您应该确保所有功能和变量都尽可能强类型，因为这可以帮助您避免任何问题。

所以，以下几行看起来很可疑：

fs.doc(`member/${memberID}`);

transaction.update(docRef, {badgeCount: ++count});

const doc = admin.firestore().doc(`member/${memberID}`);

Answer 2

这是因为你打开了太多的http连接来发送推送通知，理想情况下你应该创建批量的5,10 ..来发送推送。

尝试更改，

while(ids.length) {
    var batch = ids.splice(0, ids.length >= 5 ? 5 : ids.length);
    await Promise.all(batch.map( async (id) => { ... });
}

要，

str(aDictionary)

FCM和Typescript异步等待：网络定时输出

2 个答案: