זהו נושא דיון מלווה לערך המקורי שב־https://www.tocode.co.il/bundles/frontend/lessons/web-sockets
שלום,
אני מנסה להריץ את הקוד כמו שהוא מהתיקיה - after וניתקלת בשגיאה:
פונה אליך לאחר שכל הנסיונות לפתרונות מהרשת לא צלחו… - אשמח אם תוכל לעזור לי.
בטוחה שלא השארת שרת מדוגמה ישנה יותר רץ? כי זה נראה מההודעה שחסר בלוק בקוד השרת
(הקוד החסר הוא זה, שמופיע בשרת בתיקיית הדוגמאות:
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, token");
next();
});
בטוחה.
בדקתי עכשיו שוב - אני מריצה מהתיקיה של הדוגמאות אותה הורדתי מה - github.
האם יש צורך להפעיל איזשהי פקודה לפני הפקודה: node server.js ?
יש לך רעיון מה יכולה להיות הבעיה?
ניסיתי לעשות את אותו הדבר ממחשב אחר והבעיה חוזרת על עצמה, מה יכול להיות שפספסתי…
תודה רבה!!!
נסי להדביק את הקוד הבא בתור הקובץ server.js במקום הקוד שיש אצלך, ולאחר מכן להריץ את השרת. אם עדיין לא עובד תדביקי פה בבקשה צילום של מסך ה cmd ממנו את מריצה את השרת נראה אולי בהודעות שם יהיה רמז:
const express = require('express');
const bodyParser = require('body-parser')
const crypto = require('crypto');
const _ = require('lodash');
const app = express();
const publicMessages = [{ text: 'Hello World!', from: 'SYSTEM' }];
const privateMessages = {};
app.use(bodyParser.json())
app.use(function(req, res, next) {
console.log('Adding CORS headers');
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, token");
next();
});
const users = {};
const sockets = {};
app.post('/login', function(req, res) {
const user = req.body.username;
crypto.randomBytes(48, function(err, buf) {
const token = buf.toString('hex');
users[token] = user;
res.send({ token: token });
console.log(`User ${user} Authenticated`);
});
});
function verifyUser(req, res, next) {
const token = req.headers.token;
const user = users[token];
if (!user) { return next('Access Denied') }
req.user = user;
next();
}
app.post('/messages', verifyUser, function(req, res, next) {
const message = req.body;
message.from = req.user;
if (message.to) {
if (!privateMessages[message.to]) {
privateMessages[message.to] = [];
}
const userMessages = privateMessages[message.to];
userMessages.push(message);
for (let socket of sockets[message.to]) {
socket.emit('message', message);
}
} else {
publicMessages.push(message);
io.emit('message', message);
}
res.sendStatus(201);
});
app.get('/messages', verifyUser, function(req, res) {
const myMessages = privateMessages[req.user] || [];
res.send(publicMessages.concat(myMessages));
});
const http = require('http').createServer(app);
const io = require('socket.io')(http);
io.on('connection', function(socket){
console.log('a user connected');
socket.on('listen', function(msg) {
const username = msg.user;
if (!sockets[username]) {
sockets[username] = [];
}
sockets[username].push(socket);
});
socket.on('stop', function(msg) {
const username = msg.user;
if (sockets[username]) {
_.pull(sockets[username], socket);
}
});
});
http.listen(8080, function() {
console.log('listening on *:8080');
});
הבעיה עדיין קיימת - השגיאה קורית ממש בעת הטעינה ולא רואים הדפסות מיוחדות - מצרפת צילומי מסך:
מיד בעת הטעינה:
לאחר הכניסה רואים את ההדפסה שהוספת:
יכולה להדביק כאן את תוכן הקובץ package-lock.json שיש אצלך?
{
"requires": true,
"lockfileVersion": 1,
"dependencies": {
"accepts": {
"version": "1.3.7",
"resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
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"requires": {
"mime-types": "~2.1.24",
"negotiator": "0.6.2"
}
},
"array-flatten": {
"version": "1.1.1",
"resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
"integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
},
"base64id": {
"version": "2.0.0",
"resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
"integrity": "sha512-lGe34o6EHj9y3Kts9R4ZYs/Gr+6N7MCaMlIFA3F1R2O5/m7K06AxfSeO5530PEERE6/WyEg3lsuyw4GHlPZHog=="
},
"body-parser": {
"version": "1.19.0",
"resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
"integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
"requires": {
"bytes": "3.1.0",
"content-type": "~1.0.4",
"debug": "2.6.9",
"depd": "~1.1.2",
"http-errors": "1.7.2",
"iconv-lite": "0.4.24",
"on-finished": "~2.3.0",
"qs": "6.7.0",
"raw-body": "2.4.0",
"type-is": "~1.6.17"
}
},
"bytes": {
"version": "3.1.0",
"resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
"integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg=="
},
"component-emitter": {
"version": "1.3.0",
"resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
"integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg=="
},
"content-disposition": {
"version": "0.5.3",
"resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
"integrity": "sha512-ExO0774ikEObIAEV9kDo50o+79VCUdEB6n6lzKgGwupcVeRlhrj3qGAfwq8G6uBJjkqLrhT0qEYFcWng8z1z0g==",
"requires": {
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}
},
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"resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
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},
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"integrity": "sha512-+Hp8fLp57wnUSt0tY0tHEXh4voZRDnoIrZPqlo3DPiI4y9lwg/jqx+1Om94/W6ZaPDOUbnjOt/99w66zk+l1Xg=="
},
"cookie-signature": {
"version": "1.0.6",
"resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
"integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
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"version": "2.8.5",
"resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
"integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
"requires": {
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}
},
"debug": {
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"resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
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"integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
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"resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
"integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
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"integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
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"resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
"integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k="
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},
"escape-html": {
"version": "1.0.3",
"resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
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זה מסביר הכל - אני השתמשתי ב socket.io בגירסה 2 ואת בגירסה 3
זה הקובץ server.js שיתאים לגירסה שלך (עדכנתי עכשיו גם בתיקיית הדוגמאות):
const express = require('express');
const bodyParser = require('body-parser')
const crypto = require('crypto');
const _ = require('lodash');
const app = express();
const publicMessages = [{ text: 'Hello World!', from: 'SYSTEM' }];
const privateMessages = {};
app.use(bodyParser.json())
app.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, token");
next();
});
const users = {};
const sockets = {};
app.post('/login', function(req, res) {
const user = req.body.username;
crypto.randomBytes(48, function(err, buf) {
const token = buf.toString('hex');
users[token] = user;
res.send({ token: token });
console.log(`User ${user} Authenticated`);
});
});
function verifyUser(req, res, next) {
const token = req.headers.token;
const user = users[token];
if (!user) { return next('Access Denied') }
req.user = user;
next();
}
app.post('/messages', verifyUser, function(req, res, next) {
const message = req.body;
message.from = req.user;
if (message.to) {
if (!privateMessages[message.to]) {
privateMessages[message.to] = [];
}
const userMessages = privateMessages[message.to];
userMessages.push(message);
for (let socket of sockets[message.to]) {
socket.emit('message', message);
}
} else {
publicMessages.push(message);
io.emit('message', message);
}
res.sendStatus(201);
});
app.get('/messages', verifyUser, function(req, res) {
const myMessages = privateMessages[req.user] || [];
res.send(publicMessages.concat(myMessages));
});
const http = require('http').createServer(app);
const socketioOptions = {
cors: {
origin: "*",
allowedHeaders: "*",
methods: ["GET", "POST"]
}
};
const io = require('socket.io')(http, socketioOptions);
io.on('connection', function(socket){
console.log('a user connected');
socket.on('listen', function(msg) {
const username = msg.user;
if (!sockets[username]) {
sockets[username] = [];
}
sockets[username].push(socket);
});
socket.on('stop', function(msg) {
const username = msg.user;
if (sockets[username]) {
_.pull(sockets[username], socket);
}
});
});
http.listen(8080, function() {
console.log('listening on *:8080');
});
לייק 1
תודה רבה!! עובד מצוין!
לייק 1
שלום,
שתי שאלות אם אפשר:
1.) ניסיתי לכתוב את מערכת ההודעות עם imports כמו שלימדת ב-ES6.
האם ניתן לייבא גם את ה-socket.io עם import? אם כן כיצד?
2.) האם אפשר להשתמש ב-socket.io גם בשביל ‘GET’ ו-‘POST’ , או שתמיד הוא משתלב יחד עם בקשות ajax?
הי,
היבוא באמצעות import דורש שהספריה תהיה זמינה לנו בצד הלקוח כשאנחנו כותבים את הקוד, ואילו היבוא דרך תגית script טוען את הספריה מצד השרת כשהמערכת עולה. בספריות צד לקוח בדרך כלל נוח לנו להשתמש ב import כי באמת אנחנו יודעים במה אנחנו צריכים להשתמש כי ככה כתבנו את הקוד. במקרה של socket.io אני חושב שיותר הגיוני לטעון את הספריה מצד השרת כי אם השרת ישדרג גירסה גם הלקוח יצטרך לעבוד עם הגירסה החדשה.
ואחרי כל ההקדמה הזאת צריך גם להגיד שבהחלט יש אופציה להתקין את socket.io כחבילת צד לקוח עם npm ואז לטעון אותה עם import, החבילה נקראת socket.io-client ואפשר למצוא את הפרטים כאן:
https://www.npmjs.com/package/socket.io-client
לגבי שימוש ב socket.io עם get או post - כאן צריך לשים לב ש socket.io לא עובד בפרוטוקול http אלא בפרוטוקול שנקרא web sockets. ב web socket אין דבר כזה “סוג בקשה” (או verb כמו שנקרא ב http) - זה פשוט צינור הודעות ששולח ומקבל הודעות בין שני הצדדים
לייק 1
לגבי התשובה השניה השאלה שלי לא היתה מנוסחת נכון,
התכוונתי לשאול האם את מערכת ההודעות ניתן היה לכתוב גם בלי שימוש בפרוטוקול http אלא רק בפרוטוקול web socket?
נגיד בעת login ניתן לעשות socket.emit(‘login’,username) ואז בצד השרת בעת ‘login’ לשלוח ‘token’ עם socket.emit וכו’?
אה - כן ברור והרבה פעמים זה באמת יהיה יותר נוח
לייק 1