我第一次尝试使用网络套接字,经过一些研究后我决定使用ws。
我也使用快递,但我没有看到任何特别之处,只有当我在服务器端使用它时(我相信但我仍然对网络套接字有点困惑)。我只需要连接到Web套接字并发送ping请求并等待响应。
我有一个默认的快递申请表:
bin/www
#!/usr/bin/env node
const app = require("../app");
const debug = require("debug")("myapp:server");
const http = require("http");
const WebSocket = require("ws");
const ws = new WebSocket("ws://address-to-connect");
var port = normalizePort(process.env.PORT || "3000");
app.set("port", port);
var server = http.createServer(app);
server.listen(port);
server.on("error", onError);
server.on("listening", onListening);
function normalizePort(val) {
let port = parseInt(val, 10);
if (isNaN(port)) {
return val;
}
if (port >= 0) {
return port;
}
return false;
}
function onError(error) {
if (error.syscall !== "listen") {
throw error;
}
var bind = typeof port === "string"
? "Pipe " + port
: "Port " + port;
switch (error.code) {
case "EACCES":
console.error(bind + " requires elevated privileges");
process.exit(1);
break;
case "EADDRINUSE":
console.error(bind + " is already in use");
process.exit(1);
break;
default:
throw error;
}
}
function onListening() {
let addr = server.address();
let bind = typeof addr === "string"
? "pipe " + addr
: "port " + addr.port;
debug("Listening on " + bind);
ws.on("open", function open() {
if (error) throw error;
ws.send("PING");
});
ws.on("message", function incoming(data) {
if (error) throw error;
console.log(data);
});
}
然而,这只会让我误以为events.js:182 throw er; // Unhandled 'error' event Error: connect ECONNREFUSED
我尝试研究这个错误,并从我收集的内容中了解了一个正在使用的端口,但这是我运行的唯一应用程序。
如果需要,我的app.js看起来像:
const express = require("express");
const path = require("path");
const bodyParser = require("body-parser");
var app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(function (err, req, res, next) {
res.locals.message = err.message;
res.locals.error = req.app.get("env") == "development" ? err : {};
res.status(err.status || 500);
});
module.exports = app;