jsperf-img-svc/lib/svg-to-xml.js

A simple micro service for loading jsperf result charts as a static image

'use strict';

var
	_ = require('lodash'),
	Promise = require('bluebird'),
	webpage = require('webpage'),
	system = require('system'),
	config = JSON.parse(system.args[1]),
	url = system.args[2],
	page = _.assign(webpage.create(), {
		onConsoleMessage: function(msg){
			console.log(msg);
		},
		viewportSize: {width: 1420, height: 660}
	});

page.open(url, function(){
	(function getChart(){
		return Promise
			.resolve()
			.then(function(){
				return page.evaluate(function(selector){
					return document.querySelectorAll(selector);
				}, config.selector);
			})
			.then(function(result){
				var hasChildren = result.length && page.evaluate(function(svg){
					return svg.childElementCount > 0;
				}, result[0]);
				if (!hasChildren) {
					return new Promise(function(resolve, reject){
						setTimeout(resolve, 100);
					})
					.then(function(){
						return getChart();
					});
				}
			});
	}())
	.then(function(){
		var data = page.evaluate(function(selector){
			var svg = document.querySelector(selector);
			var bcr = svg.getBoundingClientRect();
			return {
				width: bcr.width,
				height: bcr.height,
				data: new XMLSerializer().serializeToString(svg)
			};
		}, config.selector);
		console.log(JSON.stringify(data));
	})
	.finally(function(){
		phantom.exit();
	});
});