[我正在尝试使用nodejs worker_threads在Sapper上启动线程,但看起来它也在尝试启动另一个Polka实例。
您可以在此repo上找到我的代码,但是它基本上具有到http://localhost:3000/worker
的路由,该路由会获取服务器端worker\run.js
。它调用具有worker_threads逻辑的worker.js
。
run.js
调用worker.js
上的main()函数并创建一个新线程,该线程将自己重新加载到工作线程实例中,这一次与if (!isMainThread) {...}
条件匹配,执行console.logs(我尝试了其他用途,并且出现了相同的问题)。
/* worker.js */
import { Worker, isMainThread } from 'worker_threads';
export const main = () => new Promise(function (resolve, reject) {
if (!isMainThread) return;
// This re-loads the current file inside a Worker instance.
const wk = new Worker(__filename);
wk.on("online", () => console.log("Worker UP"));
wk.on("message", (msg) => {
console.log("message ~>", msg);
resolve(msg);
});
wk.on("exit", (code) => console.warn("exit ~>", code));
wk.on("error", (err) => {
console.error("error ~>", err);
reject(err);
});
})
if (!isMainThread) {
console.log('Inside Worker!');
console.log(isMainThread);
}
但是返回以下错误(请注意,console.log(isMainThread)
未执行):
> sapper dev
✔ client (3.3s)
✔ server (3.3s)
> Listening on http://localhost:3000
✔ service worker (84ms)
Worker UP
Inside Worker!
error ~> Error: listen EADDRINUSE: address already in use :::3000
at Server.setupListenHandle [as _listen2] (net.js:1313:16)
at listenInCluster (net.js:1361:12)
at Server.listen (net.js:1449:7)
at Polka.listen (/mnt/disk2/adr/lab2/pollers/worker/node_modules/.pnpm/registry.npmjs.org/polka/1.0.0-next.11/node_modules/polka/build.js:59:22)
at Object.<anonymous> (/mnt/disk2/adr/lab2/pollers/worker/__sapper__/dev/server/server.js:3119:3)
at Module._compile (internal/modules/cjs/loader.js:1133:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1153:10)
at Module.load (internal/modules/cjs/loader.js:977:32)
at Function.Module._load (internal/modules/cjs/loader.js:877:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12) {
code: 'EADDRINUSE',
errno: 'EADDRINUSE',
syscall: 'listen',
address: '::',
port: 3000
}
exit ~> 1
分析汇总的输出之后:
/* __sapper__/dev/server/server.js */
'use strict';
function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }
var sirv = _interopDefault(require('sirv'));
var polka = _interopDefault(require('polka'));
var compression = _interopDefault(require('compression'));
var fs = _interopDefault(require('fs'));
var path = _interopDefault(require('path'));
var worker_threads = require('worker_threads');
var Stream = _interopDefault(require('stream'));
var http = _interopDefault(require('http'));
var Url = _interopDefault(require('url'));
var https = _interopDefault(require('https'));
var zlib = _interopDefault(require('zlib'));
if (!worker_threads.isMainThread) {
console.log('Inside Worker!');
console.log(worker_threads.isMainThread);
}
var route_0 = /*#__PURE__*/Object.freeze({
__proto__: null
});
const main = () => new Promise(function (resolve, reject) {
if (!worker_threads.isMainThread) return;
// This re-loads the current file inside a Worker instance.
const wk = new worker_threads.Worker(path.join(__dirname, "threads.js"));
wk.on("online", () => console.log("Worker UP"));
wk.on("message", (msg) => {
console.log("message ~>", msg);
resolve(msg);
});
wk.on("exit", (code) => console.warn("exit ~>", code));
wk.on("error", (err) => {
console.error("error ~>", err);
reject(err);
});
});
...
汇总将所有文件捆绑到一个文件中,因此Worker(__filename)
将其再次加载到线程中。
所以我将要装入线程的文件放入单独的文件中:
/* thread.js */
import { isMainThread } from 'worker_threads';
if (!isMainThread) {
console.log('Inside Worker!');
console.log(isMainThread);
}
并将Worker实例的构造更改为:
const wk = new Worker(path.join(__dirname, "thread.js"));
现在错误已更改为:
"Cannot find module '/mnt/disk2/adr/lab2/pollers/worker/__sapper__/dev/server/thread.js'"
问题现在归结为汇总配置,以使thread.js与server.js分开。
Sapper以自己的方式处理汇总配置,否则我可以这样设置rollup.config.js
:
export default [
{
input: "server.js",
output: {
file: "dist/server.js",
format: "cjs",
},
},
{
input: "thread.js",
output: {
file: "dist/thread.js",
format: "cjs",
},
},
];
现在的问题是:有没有办法在不修改Sapper代码的情况下做到这一点?
[至少在sapper v0.27.0上,要解决此问题,我在服务器上输入了要作为线程执行的文件。rollup.config.js
上的输入:
export default {
server: {
input: { ...config.server.input(), threads: "src/routes/worker/threads.js" },
output: config.server.output(),
}
}
[config.server.intput()
返回{ server: `${__chunk_3.src}/server.js` }
,然后添加threads: "path_to_thread_file"
可以解决问题。