Heroku 上的 Socket.io 聊天应用程序与 node.js

Posted 2023-03-07

【中文标题】Heroku 上的 Socket.io 聊天应用程序与 node.js

【英文标题】：Socket.io chat app on heroku with node.js

【发布时间】：2012-08-11 09:01:22

【问题描述】：

搞砸了 Node.js，有点不知所措，因为我无法得到这么简单的东西。此代码在我的本地服务器上运行良好，但聊天在 Heroku 上不起作用。如果我输入一些东西，什么都不会发生。我检查了 Heroku 日志，它们看起来不错。

package.json

     "name": "mukhin_chat",
     "description": "example chat application with socket.io",
     "version": "0.0.1",
     "dependencies": 
        "express": "2.4.6",
        "socket.io": "0.8.4"
     ,
    "engines": 
    "node": "0.8.x",
    "npm": "1.1.x"
  

app.js

// Variable port setting for heroku

var port = process.env.PORT || 3000;

var app = require('express').createServer()
var io = require('socket.io').listen(app);

app.listen(port);

// Heroku setting for long polling - assuming io is the Socket.IO server object
io.configure(function ()  
  io.set("transports", ["xhr-polling"]); 
  io.set("polling duration", 10); 
);

// routing
app.get('/', function (req, res) 
  res.sendfile(__dirname + '/index.html');
);

// usernames which are currently connected to the chat
var usernames = ;

io.sockets.on('connection', function (socket) 

    // when the client emits 'sendchat', this listens and executes
    socket.on('sendchat', function (data) 
        // we tell the client to execute 'updatechat' with 2 parameters
        io.sockets.emit('updatechat', socket.username, data);
    );

    // when the client emits 'adduser', this listens and executes
    socket.on('adduser', function(username)
        // we store the username in the socket session for this client
        socket.username = username;
        // add the client's username to the global list
        usernames[username] = username;
        // echo to client they've connected
        socket.emit('updatechat', 'SERVER', 'you have connected');
        // echo globally (all clients) that a person has connected
        socket.broadcast.emit('updatechat', 'SERVER', username + ' has connected');
        // update the list of users in chat, client-side
        io.sockets.emit('updateusers', usernames);
    );

    // when the user disconnects.. perform this
    socket.on('disconnect', function()
        // remove the username from global usernames list
        delete usernames[socket.username];
        // update list of users in chat, client-side
        io.sockets.emit('updateusers', usernames);
        // echo globally that this client has left
        socket.broadcast.emit('updatechat', 'SERVER', socket.username + ' has disconnected');
    );
);

index.html

<script src="/socket.io/socket.io.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<script>
    var socket = io.connect('http://localhost:8080');

    // on connection to server, ask for user's name with an anonymous callback
    socket.on('connect', function()
        // call the server-side function 'adduser' and send one parameter (value of prompt)
        socket.emit('adduser', prompt("What's your name?"));
    );

    // listener, whenever the server emits 'updatechat', this updates the chat body
    socket.on('updatechat', function (username, data) 
        $('#conversation').append('<b>'+username + ':</b> ' + data + '<br>');
    );

    // listener, whenever the server emits 'updateusers', this updates the username list
    socket.on('updateusers', function(data) 
        $('#users').empty();
        $.each(data, function(key, value) 
            $('#users').append('<div>' + key + '</div>');
        );
    );

    // on load of page
    $(function()
        // when the client clicks SEND
        $('#datasend').click( function() 
            var message = $('#data').val();
            $('#data').val('');
            // tell server to execute 'sendchat' and send along one parameter
            socket.emit('sendchat', message);
        );

        // when the client hits ENTER on their keyboard
        $('#data').keypress(function(e) 
            if(e.which == 13) 
                $(this).blur();
                $('#datasend').focus().click();
            
        );
    );

</script>
<div style="float:left;width:100px;border-right:1px solid black;height:300px;padding:10px;overflow:scroll-y;">
    <b>USERS</b>
    <div id="users"></div>
</div>
<div style="float:left;width:300px;height:250px;overflow:scroll-y;padding:10px;">
    <div id="conversation"></div>
    <input id="data" style="width:200px;" />
    <input type="button" id="datasend" value="send" />
</div>

过程文件

web: node app.js

日志

2012-08-15T01:24:03+00:00 heroku[web.1]: State changed from up to starting
2012-08-15T01:24:03+00:00 heroku[slugc]: Slug compilation finished
2012-08-15T01:24:05+00:00 heroku[web.1]: Starting process with command `node app.js`
2012-08-15T01:24:05+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2012-08-15T01:24:07+00:00 heroku[web.1]: Process exited with status 1
2012-08-15T01:24:08+00:00 app[web.1]:    info  - socket.io started
2012-08-15T01:24:09+00:00 heroku[web.1]: State changed from starting to up
2012-08-15T01:24:21+00:00 heroku[router]: GET still-bastion-7144.herokuapp.com/ dyno=web.1 queue=0 wait=0ms service=23ms status=200 bytes=1774
2012-08-15T01:24:21+00:00 app[web.1]:    debug - served static /socket.io.js
2012-08-15T01:24:21+00:00 heroku[router]: GET still-bastion-7144.herokuapp.com/socket.io/socket.io.js dyno=web.1 queue=0 wait=0ms service=15ms status=200 bytes=95997
2012-08-15T01:24:23+00:00 heroku[router]: GET still-bastion-7144.herokuapp.com/favicon.ico dyno=web.1 queue=0 wait=0ms service=3ms status=404 bytes=34
2012-08-15T01:24:45+00:00 heroku[router]: GET still-bastion-7144.herokuapp.com/ dyno=web.1 queue=0 wait=0ms service=7ms status=200 bytes=1774
2012-08-15T01:24:45+00:00 app[web.1]:    debug - served static /socket.io.js
2012-08-15T01:24:45+00:00 heroku[router]: GET still-bastion-7144.herokuapp.com/socket.io/socket.io.js dyno=web.1 queue=0 wait=0ms service=18ms status=200 bytes=95997
2012-08-15T01:24:50+00:00 heroku[router]: GET still-bastion-7144.herokuapp.com/ dyno=web.1 queue=0 wait=0ms service=6ms status=304 bytes=0
2012-08-15T01:24:51+00:00 app[web.1]:    debug - served static /socket.io.js
2012-08-15T01:24:51+00:00 heroku[router]: GET still-bastion-7144.herokuapp.com/socket.io/socket.io.js dyno=web.1 queue=0 wait=0ms service=14ms status=200 bytes=95997

【问题讨论】：

你知道在 Heroku 上，websockets 不工作，socket.io 退回到长轮询或心跳？

是的。我为长轮询添加了 heroku 配置（app.js 的第 6 行） - 但我的理解是，即使使用该设置，聊天应用程序仍然可以工作。

【参考方案1】：

我的聊天在本地完美运行，但是当我将它上传到服务器时，它在不同设备之间无法正常工作。我以同样的方式解决了它： 在我的 index.html 中，我在本地设置了 var socket = io.connect();，它是 io.connect('http://localhost:8081'); 现在它就像魅力一样））））））

【讨论】：

哇，我刚刚为此浪费了大约 6 小时的高效开发时间。我爱你，想给你一个大大的拥抱。

【参考方案2】：

要让 websocket 在 heroku 上运行，您必须先启用它们。

从终端使用这个heroku labs:enable websockets -a yourappname。

希望这能解决问题。

【参考方案3】：

在您的客户端代码中，您尝试连接到端口 8080，这与您的服务器正在侦听的端口不一致。

【讨论】：

你是对的。对于其他查看此问题的人，通过将 index.html 的第 4 行更改为“ var socket = io.connect(); ”解决了问题，只需删除本地端口引用。