按照net和child_process模塊的官方節點檔案，我歸檔了這個：一個產生子節點并通過net模塊連接的服務器。但是連接是斷斷續續的。代碼是不言自明的，但我在代碼注釋中添加了詳細資訊：
// server.js
const childProcess = require('child_process').fork('child.js');
const server = require('net').createServer((socket) => {
console.log('got socket connection'); // this callback is intermitent
socket.on('data', (stream) => {
console.log(stream.toString());
})
});
server.on('connection', () => {
console.log('someone connected to server'); // this is running only if the code above runs (but its intermitent)
});
server.on('listening', () => {
console.log('server is listening'); // this is the first log to execute
childProcess.send('server', server); // send the server connection to forked child
});
server.listen(null, function () {
console.log('server listen callback'); // this is the second log to execute
});
// child.js
console.log('forked'); // this is the third log to execute
const net = require('net');
process.on('message', (m, server) => {
if (m === 'server') {
const socket = net.connect(server.address());
socket.on('ready', () => {
console.log('child is ready'); // this is the fourth log to execute
socket.write('child first message'); // this is always running
})
}
});
執行時的預期日志node server是：
server is listening
server listen callback
forked
child is ready
got socket connection
someone connected to server
child first message
但由于套接字回呼 (at createServer) 是間歇性的，我們有 50% 的機會得到這個：
server is listening
server listen callback
forked
child is ready
IDK該怎么辦了，已經嘗試了所有我能做的......我做錯了什么？
uj5u.com熱心網友回復：
剛剛發現問題是什么......當我閱讀檔案時，我誤解了net服務器被發送到子行程以共享“連接”以將處理劃分為多個行程，以及我試圖存檔的內容只是與分叉孩子的兩種方式交流。如果有人遇到與我相同的問題，我會在這里回答這個問題。這是最終的代碼：
// server.js
const childProcess = require('child_process').fork('child.js');
const server = require('net').createServer((socket) => {
console.log('got socket connection');
socket.on('data', (stream) => {
console.log(stream.toString());
})
});
server.on('connection', () => {
console.log('someone connected to server');
});
server.listen(null, function () {
childProcess.send(server.address());
});
// child.js
console.log('forked');
const net = require('net');
process.on('message', (message) => {
if (message.port) {
const socket = net.connect(message);
socket.on('ready', () => {
console.log('child is ready');
socket.write('child first message');
})
}
});
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標籤：javascript 节点.js 插座 工控机
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