我想通过nodejs将文件流传输到多个客户端。 假设我希望有5个客户端连接到服务器,然后服务器“广播”视频内容。
到目前为止,我的代码还可以流式传输文件:
const express = require("express");
const fs = require("fs");
const app = express();
app.listen(8081);
app.get('/video', function (req, res) {
const path = './video.webm';
const stat = fs.statSync(path);
const fileSize = stat.size;
const range = req.headers.range;
if (range) {
const parts = range.replace(/bytes=/, "").split("-");
const start = parseInt(parts[0], 10);
const end = parts[1] ? parseInt(parts[1], 10) : fileSize - 1;
const chunksize = (end - start) + 1;
const file = fs.createReadStream(path, {start, end});
const head = {
'Content-Range': "bytes ${start}-${end}/${fileSize}",
'Accept-Ranges': 'bytes',
'Content-Length': chunksize,
'Content-Type': 'video/webm'
};
res.writeHead(206, head);
file.pipe(res);
} else {
const head = {
'Content-Length': fileSize,
'Content-Type': 'video/webm'
};
res.writeHead(200, head);
fs.createReadStream(path).pipe(res)
}
});
效果很好,但是缺少“等待5个客户端”代码。
我不知道该如何存档。 主要问题是:我如何告诉客户,将来会有内容,而他不关闭连接?
那是我尝试过的(不是我想要的方式,只有最后一个客户才能获得内容):
var counter = 0;
app.get('/video', function (req, res) {
counter++;
const path = './video.webm';
const stat = fs.statSync(path);
const fileSize = stat.size;
const range = req.headers.range;
const head = {
'Content-Length': fileSize,
'Content-Type': 'video/webm'
};
res.writeHead(200, head);
const wait = setInterval(function () {
res.write("");
}, 1000);
if(counter === 2){
clearInterval(wait);
fs.createReadStream(path).pipe(res);
}
});
“ setInterval”是必需品吗?
感谢任何想法和建议
编辑:那就是我想要的,但是它不是真正的“实时”时间。 Stream适用于所有客户端,但是有一点延迟。有没有办法同步流?
var counter = 0;
var requests = [];
app.get('/video', function (req, res) {
counter++;
const path = './video.webm';
const stat = fs.statSync(path);
const fileSize = stat.size;
const range = req.headers.range;
const head = {
'Content-Length': fileSize,
'Content-Type': 'video/webm'
};
res.writeHead(200, head);
requests.push(res);
const wait = setInterval(function () {
res.write("");
}, 1000);
if(counter === 2){
clearInterval(wait);
const stream = fs.createReadStream(path);
stream.on("error", function(err){
console.log(">>", err);
});
requests.forEach(function(client){
stream.pipe(client);
});
}
});