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Grunt plugin wrapping phantomas to measure frontend performance
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README.md

grunt-phantomas

Build Status bnpm version npm downloads Dependency Status Coverage Status Built with Grunt

Grunt plugin for phantomas

Getting Started

This plugin requires Grunt ~0.4.1

If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:

npm install grunt-phantomas --save-dev

Once the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:

grunt.loadNpmTasks('grunt-phantomas');

The "phantomas" task

You're looking for a tool that gives you detailed metrics about your site? Great!!! This grunt plugin executes phantomas for you and visualizes the returned metrics in a generated index.html for you. It will keep track of history, so that you can set it up and check reports after every deployment of your site. Read below to learn how to setup history tracking in different CI systems.

Examples of rendered output:

I'm still at early stage, but I think you can already work with it. ;)

Overview

In your project's Gruntfile, add a section named phantomas to the data object passed into grunt.initConfig().

grunt.initConfig( {
  phantomas: {
    gruntSite : {
      options : {
        indexPath : './phantomas/',
        options   : {},
        url       : 'http://gruntjs.com/',
        buildUi   : true
      }
    }
  }
} )

Options

options.additionalStylesheet

Type: String|Boolean Default value: false

If you don't like the phantomas default styling and want to customize it, you can set the path to an additional stylesheet, that will be copied and loaded in the generated index.html.

options.assertions

Type: Object Default Value: {}

An object that represents possible assertions for your generated UI. Best way is to run grunt-phantomas once and setting these values afterwards for particular metrics. The UI will warn you whenever the median value of your defined runs of a specific metric will go over the specified value by highlighting depending graphs and showing warnings on top of the built UI. Using this option you can easily keep track of getting worse values. Performance budget for the win. :)

Example:

phantomas : {
  /* https://github.com/stefanjudis/grunt-phantomas */
  grunt : {
    options : {
      assertions : {
        assetsWithQueryString : 3,     // receive warning, when there are more than 3 assets with a query string
        bodyHTMLSize          : 10500, // receive warning, when the bodyHTMLsize is bigger than 10500
        jsErrors              : 0,     // receive warning, when more than 0 JS errors appear
        gzipRequests          : {      // receive warning, when less compressed assets are loaded then 10 ( might be useful for checking server configurations )
          type  : '<',
          value : 10
        }
      },
      indexPath  : './phantomas/',
      options    : {
        'timeout' : 30
      },
      url        : 'http://gruntjs.com/'
    }
  }
}

options.buildUi

Type: Boolean Default value: true

If you want to use grunt-phantomas without generating a UI for the data, this is an option to switch off the visualization interface. If set to false only defined data format will be outputted at options.indexPath + '/data/'.

options.indexPath

Type: String Default value: ./phantomas/

A string value that represents the relative path to the place where phantomas will render your metrics. Inside of this folder an index.html, a data folder and an assets folder will be created.

options.limitIncludedRuns

Type: Number|false Default value: 30

A numeric value that sets a limit for the included runs inside of the built UI. In case you run grunt-phantomas on a hourly/daily basis the generated UI might become slow, because of the big amout of data. Solve this by setting the limit to a lower value.

In case you are fine with all runs included in the UI set it to false.

options.numberOfRuns

Type: Number Default value: 5

A numeric value that represents the number of times the phantomas executable will be started. The more times it runs the more reliable metrics become.

options.options

Type: Object Default value: {}

An object that represents possible options for phantomas executable. For more information please check the official api documentation and list of possible parameters. See usage examples later on.

options.output

Type: Array Default value: [ 'json', 'csv' ]

Choose to output CSV or JSON files. The default is JSON and CSV. The buildUi option does not work if json is not included in options.output. You have to set buildUi to false, if you want to write CSV files only.

options.group

Type: Object Default value:

{
  'REQUESTS' : [
    'requests',
    'gzipRequests',
    'postRequests',
    'httpsRequests',
    'notFound',
    'multipleRequests',
    'maxRequestsPerDomain',
    'domains',
    'medianRequestsPerDomain',
    'redirects',
    'redirectsTime',
    'smallestResponse',
    'biggestResponse',
    'smallestLatency',
    'biggestLatency',
    'medianResponse',
    'medianLatency',
    'assetsNotGzipped',
    'assetsWithQueryString',
    'smallImages'
  ],
  'TIMINGS' : [
    'timeToFirstByte',
    'timeToLastByte',
    'timeToFirstCss',
    'timeToFirstJs',
    'timeToFirstImage',
    'fastestResponse',
    'slowestResponse',
    'onDOMReadyTime',
    'onDOMReadyTimeEnd',
    'windowOnLoadTime',
    'windowOnLoadTimeEnd',
    'httpTrafficCompleted',
    'timeBackend',
    'timeFrontend'
  ],
  'HTML' : [
    'bodyHTMLSize',
    'iframesCount',
    'imagesWithoutDimensions',
    'commentsSize',
    'hiddenContentSize',
    'whiteSpacesSize',
    'DOMelementsCount',
    'DOMelementMaxDepth',
    'nodesWithInlineCSS',
    'foo'
  ],
  'JAVASCRIPT' : [
    'eventsBound',
    'documentWriteCalls',
    'evalCalls',
    'jsErrors',
    'consoleMessages',
    'windowAlerts',
    'windowConfirms',
    'windowPrompts',
    'globalVariables',
    'localStorageEntries',
    'ajaxRequests'
  ],
  'DOM' : [
    'DOMqueries',
    'DOMqueriesById',
    'DOMqueriesByClassName',
    'DOMqueriesByTagName',
    'DOMqueriesByQuerySelectorAll',
    'DOMinserts',
    'DOMqueriesDuplicated'
  ],
  'HEADERS' : [
    'headersCount',
    'headersSentCount',
    'headersRecvCount',
    'headersSize',
    'headersSentSize',
    'headersRecvSize'
  ],
  'CACHING' : [
    'cacheHits',
    'cacheMisses',
    'cachePasses',
    'cachingNotSpecified',
    'cachingTooShort',
    'cachingDisabled'
  ],
  'COOKIES' : [
    'cookiesSent',
    'cookiesRecv',
    'domainsWithCookies',
    'documentCookiesLength',
    'documentCookiesCount'
  ],
  'COUNTS & SIZES' : [
    'contentLength',
    'bodySize',
    'htmlSize',
    'htmlCount',
    'cssSize',
    'cssCount',
    'jsSize',
    'jsCount',
    'jsonSize',
    'jsonCount',
    'imageSize',
    'imageCount',
    'webfontSize',
    'webfontCount',
    'base64Size',
    'base64Count',
    'otherCount',
    'otherSize'
  ],
  'JQUERY' : [
    'jQueryOnDOMReadyFunctions',
    'jQuerySizzleCalls'
  ]
}

An object that represents the metrics grouping rendered inside of the generated index.html. You can set up your grouping by just passing another object to this option.

Example:

phantomas : {
  /* https://github.com/stefanjudis/grunt-phantomas */
  grunt : {
    options : {
      indexPath : './phantomas/',
      options   : {
        'timeout' : 30
      },
      url       : 'http://gruntjs.com/',
      group     : {
        'foo' : [ 'cookiesSent' ]
      }
    }
  }
}

This configuration will lead to a rather empty looking rendered index.html. :) Additionally you will be informed, which metrics you missed during the build process.

Output for example:

CHECKING FOR NOT DISPLAYED METRICS.
>> You are currently not displaying the following metrics:
>> requests, gzipRequests, postRequests, httpsRequests, notFound, timeToFirstByte, timeToLastByte, bodySize, contentLength, ajaxRequests, htmlCount, htmlSize, cssCount, cssSize, jsCount, jsSize, jsonCount, jsonSize, imageCount, imageSize, webfontCount, webfontSize, base64Count, base64Size, otherCount, otherSize, cacheHits, cacheMisses, cachePasses, cachingNotSpecified, cachingTooShort, cachingDisabled, consoleMessages, domains, maxRequestsPerDomain, medianRequestsPerDomain, DOMqueries, DOMqueriesById, DOMqueriesByClassName, DOMqueriesByTagName, DOMqueriesByQuerySelectorAll, DOMinserts, DOMqueriesDuplicated, eventsBound, headersCount, headersSentCount, headersRecvCount, headersSize, headersSentSize, headersRecvSize, documentWriteCalls, evalCalls, jQueryOnDOMReadyFunctions, jQuerySizzleCalls, jsErrors, redirects, redirectsTime, assetsNotGzipped, assetsWithQueryString, smallImages, multipleRequests, timeToFirstCss, timeToFirstJs, timeToFirstImage, onDOMReadyTime, onDOMReadyTimeEnd, windowOnLoadTime, windowOnLoadTimeEnd, timeBackend, timeFrontend, httpTrafficCompleted, windowAlerts, windowConfirms, windowPrompts, cookiesRecv, domainsWithCookies, documentCookiesLength, documentCookiesCount, bodyHTMLSize, iframesCount, imagesWithoutDimensions, commentsSize, hiddenContentSize, whiteSpacesSize, DOMelementsCount, DOMelementMaxDepth, nodesWithInlineCSS, globalVariables, localStorageEntries, smallestResponse, biggestResponse, fastestResponse, slowestResponse, smallestLatency, biggestLatency, medianResponse, medianLatency

options.url

Type: String Default value: http://gruntjs.com/

A string value that represents the url of the site, which will be analyzed by phantomas.

Usage Examples

Default Options

In this example, the default options are used to fetch metrics of http://gruntjs.com and render the visualized metrics at ./phantomas.

grunt.initConfig({
  phantomas: {
    yourSite: {}
  }
});

Grunt task options

In this example, custom options are used to fetch metrics of http://yoursite.com and render the visualized metrics at ./yoursite/.

grunt.initConfig( {
  phantomas: {
    yourSite : {
      options : {
        additionalStylesheet : '/Users/foo/bar/custom.css',
        assertions : {
          'assetsWithQueryString' : 3,
          'biggestLatency'        : 1400,
          'bodyHTMLSize'          : 10500,
          'commentsSize'          : 55,
          'consoleMessages'       : 0,
          'hiddenContentSize'     : 65,
          'jsErrors'              : 0,
          'gzipRequests'          : 8,
          'medianResponse'        : 400,
          'nodesWithInlineCSS'    : 0,
          'requests'              : 30,
          'timeToFirstImage'      : 1100,
          'DOMelementsCount'      : 200,
          'DOMqueries'            : 10
        },
        indexPath            : './yoursite/',
        url                  : 'http://yoursite.com/',
        numberOfRuns         : 10
      }
    }
  }
} );

Output options

Build ui
grunt.initConfig( {
  phantomas: {
    yoursite : {
      options : {
        indexPath            : './phantomas/',
        options              : {
          'timeout' : 30
        },
        url                  : 'http://gruntjs.com/'
      }
    }
  }
}
Export JSON data only
grunt.initConfig( {
  phantomas: {
    yoursite : {
      options : {
        buildUi              : false,
        output               : 'json',
        indexPath            : './phantomas/',
        options              : {
          'timeout' : 30
        },
        url                  : 'http://gruntjs.com/'
      }
    }
  }
}
Export CSV data only
grunt.initConfig( {
  phantomas: {
    yoursite : {
      options : {
        buildUi              : false,
        output               : 'csv',
        indexPath            : './phantomas/',
        options              : {
          'timeout' : 30
        },
        url                  : 'http://gruntjs.com/'
      }
    }
  }
}

Phantomas options

In this example, the phantomas option is used to set phantomas execution parameters. In this case all external script except the defined ones are blocked by phantomas, what can become really handy, when dealing with a lot of third party scripts that influence your site performance. Additionally phantomas will wait 30 seconds for all resources to be loaded until it quits with the timeout status code 252.

grunt.initConfig( {
  phantomas: {
    yourSite : {
      options : {
        indexPath : './yoursite/',
        options   : {
          'allow-domain' : 'cdn.yoursite.com.br,ajax.googleapis.com',
          'no-externals' : true,
          'timeout'      : 30

        },
        url       : 'http://yoursite.com'
      }
    }
  }
} );

Troubleshooting

By default, the experimental film-strip option is true. If the grunt phantomas command fails, try setting the film strip option to false:

grunt.initConfig( {
  phantomas: {
    yourSite : {
      options : {
        indexPath : './yoursite/',
        options   : {
          'film-strip'   : false
        },
        url       : 'http://yoursite.com'
      }
    }
  }
} );

Tracking history in CI

To track history in Travis CI, use the caching option to cache the indexPath folder.

Note:

Formatters are not supported as options for Phantomas, because they are not implemented in the CommonJS version of Phantomas.

Donating

Support this project and others by stefanjudis via gittip.

Support via Gittip

Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using Grunt.

To make sure tests are passing and coding style is in a good shape please run grunt test before applying changes.

Release History

Please check release history at Github. :)

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