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scenes to be used
When we need real-time communication, we can use WebSocket, but we already have the npm ecological chain, we can directly install the socket.io-client module, and the corresponding server uses the socket.io module.
Download and install:
// 前端
npm install socket.io-client
// 或
yarn add socket.io-client
// 后台
npm install socket.io
When we are developing the project, we may use cross-domain functions, and configure setupProxy.js accordingly
const {
createProxyMiddleware } = require('http-proxy-middleware');
module.exports = app => {
app.use('/api', createProxyMiddleware({
target: 'http://localhost:9999',
changeOrigin: true,
ws: false
}));
app.use('/socket.io', createProxyMiddleware({
target: 'ws://localhost:3004',
changeOrigin: true,
ws: true
}));
};
Do we still need to pass in the target URL when configuring the socket?
Pro-testing is required. In addition, we'd better open an IO service to monitor socket messages, so that it will not be affected by the business port 9999.
const io = require('socket.io-client');
const socket = io('http://localhost:3004');
const app = express()
, server = require('http').createServer(app)
, io = require('socket.io')(server);
io.listen(3004);
module.exports = io;
Code
front end:
import store from '@store';
import {
setSocketID } from '@store/actionCreators';
const Singleton = (function () {
let instance;
function createInstance() {
const io = require('socket.io-client');
const socket = io('http://localhost:3004');
return socket;
}
return {
getInstance: function () {
if (!instance) {
instance = createInstance().connect();
// 创建socket就更新数据
instance.on('connect', async () => {
// 更新数据库status中的socket.id
store.dispatch(setSocketID(instance.id));
await updateUS(instance.id);
});
}
return instance;
},
disconnectSocket: ()=>{
console.log('disconnect', instance)
if (instance) {
instance.disconnect();
}
instance = null;
return instance;
}
};
})();
async function updateUS(socketID) {
// ...
}
export default Singleton;
rear end:
const app = express()
, server = require('http').createServer(app)
, io = require('socket.io')(server);
io.listen(3004);
// socket
io.on('connection', function (socket) {
console.log('连接成功')
socket.on('newMessage', async (params) => {
// 。。。
}
});
});
module.exports = io;