simple-checker.js

var info    =   "[info]....."+Date()+"  ";
var warning =   "[warning].."+Date()+"  ";
var notice  =   "[notice]..."+Date()+"  ";

var exec =  require("child_process").exec, child;

var socket = require("socket.io-client")("http://localhost:8080");

console.log(info+"start");

socket.on("connect", function(){
    console.log(info+"connected");
})

function reset(){
    child = exec("service nginx restart",
                function(error, stdout, stderr){
                    console.log("stdout: "+stdout);
                    console.log("stderr: "+stderr);
                    if(error != null){
                        console.log("exec error: "+error);
                    }
                }
            );
}

socket.on("timeout", function(){
    console.log(info+"timeout");
    console.log(info+"reset");
    reset();
})

socket.on("disconnect", function(){
    console.log(info+"disconnect");
    console.log(info+"reset");
    reset();
})