如何在Firebase Cloud的Express服务器中的res.send()之后执行代码 [英] How to exec code after res.send() in express server at Firebase cloudFunctions

问题描述

我正在使用云功能构建快速服务器，但是我遇到了 res.send()的问题.在普通快递服务器中，我在 res.send()之后执行一些代码，但是在我的快递服务器中，使用Firebase cloudFunctions res.send()可以关闭我的连接，之后什么也不要执行.

I'm building an express server using the cloud functions, but I facing a problem with res.send(). In a common express server I can exec some code after res.send() but at my express server using the Firebase cloudFunctions res.send() closes my connection and I can't exec anything after that.

这是我需要做的:在我的服务器中，我有一个端点从Slack api对话框接收一些数据，然后Slack Api等待空响应 res.send()，所以我需要发送它.但是我还需要将这些数据保存在数据库中，然后以松弛状态发送一条消息给我的用户您的帖子已保存！" 所以我的端点会做什么:

Here is what I need to do: In my server I have an endpoint to receive some data from Slack api dialog, and after that Slack Api is waiting for a empty response res.send(), so I need to send it. But I also need to save that data in my DB, and send a message in slack to my user "Your post was saved!" So what my endpoint does:

async function myEndpoint(req, res) {
    await savePayload(req.payload);
    await sendUserMessage(req.payload);
    res.send('');
}

但是有时候 res.send()需要很长时间才能开始运行，并且在松弛时出现错误，所以我想做些类似的事情:

But sometimes res.send() takes to long to start running and I get an error on slack, so I would like to do something like:

async function myEndpoint(req, res) {
    res.send('');
    await savePayload(req.payload);
    await sendUserMessage(req.payload);
}

但是正如我所说，在 res.send('')之后，我的连接已关闭，并且下一行没有运行.您知道我该如何解决吗?

But as I said, after res.send('') my connection is closed and the next lines doesn't run. Do you know how can I work around that ?

推荐答案

响应完成后，HTTP函数立即终止执行-这是Cloud Functions的基本架构，因此无法解决.您将需要:

HTTP functions immediately terminate execution once the response is completed -- this is fundamental architecture for Cloud Functions, so there is no way around it. You will need to either:

1. 优化代码路径，以使空响应始终在截止日期之前发送，或者
2. 触发将异步执行工作的后台函数执行，然后进行响应.这可以通过例如写入Cloud Firestore或发送发布/订阅消息

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