NodeJS + Socket.io搭建聊天服务器

第一步：安装node

git clone https://github.com/joyent/node.git

cd node

git checkout v0.10.33-release

./configure

make

make install

第二步：安装npm

mac下使用命令ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

第三步：安装redis

wget http://download.redis.io/releases/redis-2.8.17.tar.gz

cd redis-2.8.17

make

启动redis服务

src/redis-server

第四步：创建package.json

cd /data/project/current/

npm init

name: (20141201051425) chat-server

version: (1.0.0)

description: chat nodejs socket.io

entry point: (chat_server.js)

test command: chat-server

git repository: (https://github.com/monstar-lab/maturi.git)

keywords: chat nodejs socket.io

author: project

license: (ISC)

第五步：

npm install redis --save

npm install socket.io --save

npm install socket.io-redis --save

npm install fs --save

其他

==========================================

npm install -g node-gyp

npm install -g npm

npm install nan -save

curl https://github.com/ohmu/node-posix

cd node-posix

node-gyp configure

node-gyp build

 

var posix = require('node-posix’);

posix.setrlimit('nofile', { soft: 10000, hard: 10000 });

================================================

npm uninstall xxx -save

 

 

 

1 2	// これで通信中のIDが取得できる var id = socket.id

メッセージを送信してきたClientへメッセージを返答

1	socket.emit('message', info);

接続しているClient全体にメッセージを送信

1	io.sockets.emit('message', info);

個別にデータを送信

1	io.sockets.socket(socket.id).emit('message', info);

• socket.emit('message','the message to be transmitted'); //simple transmission
• io.sockets.emit('message',"the message to be transmitted"); //send to all clients
• socket.broadcast.emit('message',"this is a test"); //send to all except sender

Joining and leaving

You can call join to subscribe the socket to a given channel:

io.on('connection', function(socket){
  socket.join('some room');
});

And then simply use to or in (they are the same) when broadcasting or emitting:

io.to('some room').emit('some event'):

 

To leave a channel you call leave in the same fashion as join.

 

var sockets = io.sockets.sockets;

 

 

io.sockets.on('connection', function(socket){
//console.log('コネクション数',socket.client.conn.server.clientsCount);

process.setMaxListeners(0);
   
    process.on('uncaughtException', function (err) {
        //打印出错误
        console.log('uncaughtException: ');
        console.log(err);
        //打印出错误的调用栈方便调试
        console.log(err.stack);

      });

})

 

socket连接数太少

sudo prlimit --nofile=10240  --pid 16728

pid修改成node的pid

lsof -i:8000

 

设定sudo prlimit --nofile=10240  --pid 16728

查看sudo prlimit --nofile  --pid node的pid

 

 

netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'

 ps H -eo user,pid,ppid,tid,time,%cpu,cmd --sort=%cpu

lsof -i:8000

lsof | grep TCP | grep 8000 | grep ESTABLISHED | wc -l

ps -e -o 'pid,comm,args,pcpu,rsz,vsz,stime,user,uid' | grep node |  sort

netstat –apn | grep 8000

 

pgrep -l node