node.jsとphantomasで複数回計測していくつかの項目で平均とる

main.js

var exec=require('child_process').exec;


var arr=[
	'requests',
	'httpsRequests',
	'bodySize',
	'contentLength',
	'httpTrafficCompleted',
	'timeToLastByte',
	'timeToFirstByte',
	'ajaxRequests',
	'htmlCount',
	'htmlSize',
	'cssCount',
	'cssSize',
	'jsCount',
	'jsSize',
	'imageCount',
	'imageSize',
	'otherCount',
	'otherSize',
	'DOMelementsCount',
	'DOMelementMaxDepth'
];
var maxTry=5;
var tryCount=0;
var results={};
var url='https://www.google.co.jp';

arr.forEach(function(v,i){
	results[v]=[];
});

phantomas();

function phantomas(){

	var child=exec('phantomas --url '+url+' --reporter json', function(err,stdout,stderr){
	  if (!err) {
	    // console.log('stdout: ' + stdout);
	    // console.log('stderr: ' + stderr)

	    var json=JSON.parse(stdout);
	    var m=json.metrics;
		arr.forEach(function(v,i){
			results[v].push(m[v]);
		});

		tryCount++;

		if(tryCount<maxTry){
			phantomas();
		}else{
			complete();
		}

	  } else {
	    console.log(err);
	    // err.code will be the exit code of the child process
	    console.log(err.code);
	    // err.signal will be set to the signal that terminated the process
	    console.log(err.signal);
	  }
	})

}

function complete(){
	var averages={};
	arr.forEach(function(v,i){
		var sum=0;
		results[v].forEach(function(vv,ii){
			sum+=vv;
		});
		var average=sum/maxTry;
		averages[v]=average;
	});
	console.log({
		results:results,
		averages:averages
	});
}