Node.js 将Sockets.io与React.js+;钩子;sockets.emit不工作
我完全不知道为什么这不起作用,我对在react中使用钩子还不熟悉,但是我想尝试一下Node.js 将Sockets.io与React.js+;钩子;sockets.emit不工作,node.js,reactjs,sockets,react-hooks,Node.js,Reactjs,Sockets,React Hooks,我完全不知道为什么这不起作用,我对在react中使用钩子还不熟悉,但是我想尝试一下 此应用程序基本上使用sockets.io将sockets.io连接到服务器。服务器每1s发出一次时间您必须将套接字实例存储在ref中,否则在组件重新渲染时会丢失连接的套接字实例 简而言之,您需要套接字引用在渲染中保持相同 const socketUrl = 'http://localhost:3001'; let socket = useRef(null); useEffect(() => {
此应用程序基本上使用sockets.io将sockets.io连接到服务器。服务器每1s发出一次时间您必须将套接字实例存储在ref中,否则在组件重新渲染时会丢失连接的套接字实例 简而言之,您需要套接字引用在渲染中保持相同
const socketUrl = 'http://localhost:3001';
let socket = useRef(null);
useEffect(() => {
socket.current = io(socketUrl, {
autoConnect: false,
});
...
}, [socketUrl]);
现在请注意,无论您在哪里使用socket
,您都将使用socket.current
例:
很高兴能帮忙:-)
const http = require('http');
const cors = require('cors');
const express = require('express');
const bodyParser = require('body-parser');
const cookieParser = require('cookie-parser');
const io = require('socket.io')();
const socketAuth = require('socketio-auth');
//custom modules
const router = require('./modules/router');
const db = require('./modules/db.js');
const prettyDate = require('./modules/prettyDate.js');
const sortArray = require('./modules/sortArray.js');
const app = express();
const server = http.createServer(app);
io.attach(server);
app.use(cors()); ///delete for production
app.use(bodyParser.urlencoded({ extended: true }));
app.use(fileUpload({
createParentPath: true
}));
app.use(bodyParser.json());
app.use(cookieParser());
app.use(router);
app.use(express.static('public'))
db.i12345.sessions.persistence.setAutocompactionInterval(400)
////Sessions Store; not important if you want to run the code without
function setUser(id,user,i){
console.log('setuser')
let institution = i
db[institution].sessions.find({ user:user }, function (err, docs) {
if(docs.length){
db[institution].sessions.update({user:user }, { $set: { id: id } }, { multi: true }, function (err, numReplaced) {
});
} else {
var d = new Date();
var n = d.getTime();
var doc = { user: user
, id: id
, t:n
};
db[institution].sessions.insert(doc, function (err, newDoc) {
});
}
});
}
///user verification; could easily mock; if wanting to actually run code
async function verifyUser (token,i) {
var institution =i
return new Promise((resolve, reject) => {
// setTimeout to mock a cache or database call
setTimeout(() => {
var user = new Promise((resolve,reject) =>{
db[institution].users.find({email:token}, function (err, docs) {
if(docs.length){
resolve(docs);
} else {
reject(false)
}
});
});
if (!user) {
return reject('USER_NOT_FOUND');
}
return resolve(user);
}, 200);
});
}
//// Sockets auth implementation
socketAuth(io, {
authenticate: async (socket, data, callback) => {
const { token, i } = data;
console.log(data)
try {
const user = await verifyUser(token, i);
socket.user = user;
socket.i = i
console.log(i)
return callback(null, true);
} catch (e) {
console.log(`Socket ${socket.id} unauthorized.`);
return callback({ message: 'UNAUTHORIZED' });
}
},
postAuthenticate: async (socket) => {
console.log(`Socket ${socket.id} authenticated.`);
console.log(socket.user)
setUser(socket.id,socket.user, socket.i)
socket.emit('empty list', {queryList:true});
io.emit('admin connected', {admin:true});
socket.conn.on('packet', async (packet) => {
if (socket.auth && packet.type === 'ping') {
}
});
socket.on('chatmessage', (msg) => {
io.emit('chatmessage', msg);
console.log(msg);
});
socket.on('hello', (msg) => {
io.emit('chatmessage', msg);
console.log(msg);
});
socket.on('get tasks', (get) => {
let i = socket.i
let user = socket.user
getTasksChunk(get,i,user)
});
socket.on('admin userlist', (get) => {
let i = socket.i
let user = socket.user
adminGetUserList(get,i,user)
});
socket.on('admin roles', (data) => {
let i = socket.i
let user = socket.user
console.log(data)
console.log('reaced')
});
interval = setInterval(() => getApiAndEmit(socket), 1000);
},
disconnect: async (socket) => {
console.log(`Socket ${socket.id} disconnected.`);
if (socket.user) {
}
},
})
function getTasksChunk(get,i, user){
console.log(get,i,user);
let institution = i
db[institution].tasks24.find({}, async function (err, docs) {
if(docs.length){
for(i=0;i<docs.length;i++){
docs[i].location = `Ward: ${docs[i].location.Ward} Bed: ${docs[i].location.Bed}`
docs[i].patient = docs[i].patient.join(' | ')
docs[i].timestamp = prettyDate(new Date(+docs[i].timestamp))
}
console.log(docs)
let sorted = await sortArray(docs,'timestamp')
let chunk = sorted.slice(0,10)
io.emit('tasks in', chunk);
} else {
}
});
}
const getApiAndEmit = socket => {
const response = new Date();
// Emitting a new message. Will be consumed by the client
socket.emit("FromAPI", response);
};
///////ADMIN????????
function adminGetUserList(get,i,user){
var institution = i
console.log('hello')
db[institution].users.find({}, async function (err, docs) {
if(docs.length){
console.log(docs)
let sorted = await sortArray(docs,'timestamp')
io.emit('admin user list', sorted);
} else {
}
});
}
server.listen(process.env.PORT || 3001, () => console.log(`Server has started.`));
const socketUrl = 'http://localhost:3001';
let socket = useRef(null);
useEffect(() => {
socket.current = io(socketUrl, {
autoConnect: false,
});
...
}, [socketUrl]);
socket,.current.on('hello', (msg) => {
io.emit('chatmessage', msg);
console.log(msg);
});