node 内存消息队列

var net = require(‘net‘)

var clients = []
    ,msgs = {}

function unWrapMsg(data){
    data = data.toString().trim()
    var _d = data.split(‘:‘ , 2)
    _d[1] = _d[1] || ‘‘
    var p1 = _d[0].trim()
        ,p2 = _d[1].trim()
        ,p3 = data.slice(_d[0].length + _d[1].length + 2)
    return [p1 , p2 , p3]
}
function wrapMsg(p1 , p2 ,p3){
    return [p1.toString() , p2.toString() , p3.toString()].join(‘:‘) + "\n"
}
exports.startServer = function(config){
    var cmd = {
        push : function(drawer , msg){
            if (! msgs[drawer]) msgs[drawer] = []
            msgs[drawer].push(msg)
        },
        pull : function(drawer ){
            if (! msgs[drawer]) msgs[drawer] = []
            return msgs[drawer].shift()
        },
        clean : function(drawer){
            if (drawer) msgs[drawer] = []
            else msgs = {}
        }
    }
    net.createServer(function (socket) {
        socket.name = socket.remoteAddress + ":" + socket.remotePort
        clients.push(socket)

        //socket.write("Welcome " + socket.name + "\n")

        socket.on(‘data‘, function (data) {
            data = unWrapMsg(data)
            //console.log(‘from client ‘ ,data)
            var act = data[0]
                ,drawer = data[1]
                ,msg = data[2]
            if (!cmd[act]) return
            var ret = cmd[act](drawer ,msg)
            //console.log(act ,msg , ret)
            socket.write(wrapMsg(‘on‘ + act , JSON.stringify(ret || ‘‘) ,msg) )
            //broadcast(socket.name + "> " + data, socket)
        })

        socket.on(‘end‘, function () {
            clients.splice(clients.indexOf(socket), 1)
            //broadcast(socket.name + " left the chat.\n")
        })
        function broadcast(message, sender) {
            clients.forEach(function (client) {
                // Don‘t want to send it to sender
                if (client === sender) return
                client.write(message)
            })
            process.stdout.write(message)
        }

    }).listen(config.port)

    return cmd
}


exports.startClient = function(config){
    var _cs = []
        ,cmd = {
            ‘onpull‘ : function(ret ,cbkid){
                    var cbk = _cs[cbkid]
                    cbk && cbk(ret)
                    delete _cs[cbkid]
                    }
            }
    var client = net.connect(config , function() {
        console.log(‘client connected‘)
        //client.write(‘world!\r\n‘)
    })
client.on(‘data‘, function(data) {
        data = unWrapMsg(data)
        //console.log(‘from server‘ , data)
        var act = data[0]
        if (!cmd[act]) return
        cmd[act](data[1] , data[2])
    })
    client.on(‘end‘, function() {
        console.log(‘client disconnected‘)
    })
    return {
        push : function(drawer , msg){
            client.write(wrapMsg(‘push‘ , drawer , msg))
                }
        ,pull : function(drawer ,cbk){
            var cbkid = _cs.push(cbk) - 1
            client.write(wrapMsg(‘pull‘ , drawer,cbkid))
                }
        ,clean : function(drawer ){
            client.write(wrapMsg(‘clean‘ , drawer ))
                }
    }
}