发送响应后继续执行(Firebase的Cloud Functions) [英] Continue execution after sending response (Cloud Functions for Firebase)

问题描述

我正在将Firebase函数与https触发器一起使用，我想知道在将响应发送到客户端后多长时间，这些函数会继续执行.我想向客户端发送响应，然后执行另一项操作(发送邮件). 目前，我正在执行以下操作:

I'm using Firebase Functions with https triggers, and I was wondering how long after sending the response to the client, the functions keeps executing. I want to send a response to the client and then perform another operation (send a mail). Currently I'm doing this as following:

module.exports.doSomeJob = functions.https.onRequest((req, res) => {
    doSomeAsyncJob()
    .then(() => {
        res.send("Ok");
    })
    .then(() => {
        emailSender.sendEmail();
    })
    .catch(...);
});

上面的代码对我来说是有效的，但是我怀疑该代码仅能工作，因为在res.send完成之前发送邮件已经完成了，所以我想知道终止过程到底是如何工作以确保代码不会中断.

The above code is working for me, but I'm suspecting that the code only works because sending the mail has finished before the res.send has completed, so I was wondering how exactly the termination process is working to make sure the code will not break.

推荐答案

您应该期望HTTP函数在发送响应后立即终止.任何其他行为都是运气或种族状况的某种组合.不要编写依赖运气的代码.

You should expect that the HTTP function terminates the moment after you send the response. Any other behavior is some combination of luck or a race condition. Don't write code that depends on luck.

如果您需要在工作完全完成之前向客户端发送响应，则需要启动第二个功能以继续从HTTP功能中止的位置.通常使用pub/sub函数来实现.让HTTP函数将发布/订阅消息发送给另一个函数，然后仅在消息发送之后终止HTTP函数(通过发送响应).

If you need to send a response to the client before the work is fully complete, you will need to kick off a second function to continue where the HTTP function left off. It's common to use a pub/sub function to do with. Have the HTTP function send a pub/sub message to another function, then terminate the HTTP function (by sending a response) only after the message is sent.

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