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[英]How can I emit events to connected sockets using socket.io from within my Express 4 routes?
[英]How to emit an event in socket.io from the routes file?
這是我的應用配置
app.js
//SERVER
var server = app.listen(3000, function(){
console.log("Express server listening on port %d in %s mode", app.get('port'),
app.settings.env);
});
//SOCKET.IO
var io = require('./socket.io').listen(server)
/ socketio
var socketio = require('socket.io')
module.exports.listen = function(app)
{
io = socketio.listen(app);
io.configure('development',function()
{
//io.set('transports', ['websocket', 'xhr-polling']);
//io.enable('log');
});
io.configure('production',function()
{
io.enable('browser client minification'); // send minified client
io.enable('browser client etag'); // apply etag caching logic based on version number
io.set('log level', 1); // reduce logging
io.set('transports', [ // enable all transports (optional if you want flashsocket)
'websocket'
, 'flashsocket'
, 'htmlfile'
, 'xhr-polling'
, 'jsonp-polling'
]);
});
io.sockets.on('connection', function (socket)
{
console.log("new connection: "+socket.id);
socket.on('disconnect',function(){console.log("device "+socket.id+" disconnected");});
socket.emit('news', { hello: 'world' });
socket.on('reloadAccounts',function(data)
{
var accounts=['account1','account2']
socket.emit('news',accounts)
});
});
return io
}
/路線
exports.newAccount=function(fields,callback)//localhost:3000/newAccountForm
{
//... bla bla bla config db connection bla bla bla
db.collection('accounts').insert(fields,function(err,result)
{
if(err)
{
console.warn(err);
db.close();
return callback(err,null);
}else{
if(result)
{
db.close();
return callback(null,result);
socket.emit('new account created',result) // i want to emit a new event when any user create an account
}else{
db.close();
return callback('no se consigue resultado',null);
}
}
})
});
}
如何從路由文件中發出socket.io中的事件?
首先,您需要確定要發送新信息的套接字。 如果它們都是(連接到你的應用程序的每個人),那就很簡單,只需使用io.sockets.emit:
在./socket.io
文件中添加exports.sockets = io.sockets;
在io = socketio.listen(app);
之后的某個地方io = socketio.listen(app);
。 然后在routes文件中,你可以像這樣發出:
var socketio = require('./socket.io');
socketio.sockets.emit('new account created', result);
如果您知道要發送到的套接字ID,則可以執行以下操作:
var socketio = require('./socket.io');
socketio.sockets.sockets[socketId].emit('new account created', result);
您還可以通過快速會話ID選擇套接字:
首先,您需要在授權時將會話ID附加到套接字:
io.set('authorization', function (data, accept) {
// check if there's a cookie header
if (data.headers.cookie) {
// if there is, parse the cookie
data.cookie = cookie.parse(data.headers.cookie);
// note that you will need to use the same key to grad the
// session id, as you specified in the Express setup.
data.sessionID = data.cookie['express.sid'];
} else {
// if there isn't, turn down the connection with a message
// and leave the function.
return accept('No cookie transmitted.', false);
}
// accept the incoming connection
accept(null, true);
});
然后您可以選擇具有會話ID的套接字:
var socketio = require('./socket.io');
var sockets = socketio.sockets.forEach(function (socket) {
if (socket.handshake.sessionID === req.sesssionID)
socket.emit('new account created', result);
});
您還可以查詢會話存儲並使用上述方法,將事件發送到與您的查詢匹配的sessionId的套接字。
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