使用Node.js批量发送数据 [英] Send data in chunks with nodejs

问题描述

我对Node.js很陌生，我正在为Angular 4应用程序开发后端.问题在于后端生成响应所需的全部数据的速度相当慢，我希望在可用时随时间发送数据.我正在阅读有关RxJS的信息，但我真的无法弄清楚如何在节点中使用它，您能帮我吗?

I'm quite new to nodejs and I'm working on a backend for an Angular 4 application. The problem is that the backend is quite slow to produce the whole data for the response and I'd like to send data over time as soon as it's available. I was reading about RxJS but I can't really figure out how to use it in node, can you please help me?

推荐答案

也许您正在寻找一种流数据

Maybe you are looking for a way to stream the data

通常您会用res.send(data)响应，它只能被调用一次.

Normally you respond with res.send(data), it can be called only once.

如果您正在读取和发送大文件，则可以流在使用res.write(chunk)读取文件数据的同时，在文件读取的结束"事件上，调用res.end()结束响应.

If you are reading and sending a large file, you can stream the file data while being read with res.write(chunk) and on the 'end' event of the file reading, you call res.end() to end the response.

EDIT :正如您所说的，您想要的是在块可用时立即进行流式传输，因此您可以在两次写入之间使用res.flush()命令(仅在res.write(chunk)之后刷新).

EDIT : As you state, what you want is to stream as soon as the chunk is available, so you can use the res.flush() command between writes ( just flush after res.write(chunk)).

您的情况会更快，但总体压缩效率会大大降低.

It would be much faster in your case but the overall compression will be much less efficient.

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