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nicjansma committed Dec 11, 2015
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4 changes: 4 additions & 0 deletions .bowerrc
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{
"directory": "test/vendor",
"color" : false
}
106 changes: 106 additions & 0 deletions .eslintrc
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{
"env": {
"browser": true,
"node": true,
"amd": true
},
"rules": {
//
// v1.0 rules
//
"camelcase": 2,
"comma-spacing": 2,
"consistent-return": 2,
"curly": [2, "all"],
"dot-notation": [2, { "allowKeywords": true }],
"eol-last": 2,
"eqeqeq": 2,
"key-spacing": [2, { "beforeColon": false, "afterColon": true }],
"new-cap": 2,
"new-parens": 2,
"no-alert": 2,
"no-array-constructor": 2,
"no-caller": 2,
"no-catch-shadow": 2,
"no-empty-label": 2,
"no-eval": 2,
"no-extend-native": 2,
"no-extra-bind": 2,
"no-extra-parens": [2, "functions"],
"no-implied-eval": 2,
"no-iterator": 2,
"no-label-var": 2,
"no-labels": 2,
"no-lone-blocks": 2,
"no-loop-func": 2,
"no-multi-spaces": 2,
"no-multi-str": 2,
"no-native-reassign": 2,
"no-new": 2,
"no-new-func": 2,
"no-new-object": 2,
"no-new-wrappers": 2,
"no-octal-escape": 2,
"no-process-exit": 2,
"no-proto": 2,
"no-return-assign": 2,
"no-script-url": 2,
"no-sequences": 2,
"no-shadow": 2,
"no-shadow-restricted-names": 2,
"no-spaced-func": 2,
"no-trailing-spaces": 2,
"no-undef-init": 2,
"no-underscore-dangle": 2,
"no-unused-expressions": 2,
"no-use-before-define": 2,
"no-with": 2,
"quotes": [2, "double"],
"semi": 2,
"semi-spacing": [2, {"before": false, "after": true}],
"space-infix-ops": 2,
"space-return-throw-case": 2,
"space-unary-ops": [2, { "words": true, "nonwords": false }],
"strict": [2, "function"],
"yoda": [2, "never"],

//
// Enabled over default
//
"valid-jsdoc": [1, {
"requireReturn": false,
"prefer": {
"return": "returns"
}
}],
"guard-for-in": 2,
"no-div-regex": 2,
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"no-self-compare": 2,
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"radix": 2,
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"no-new-require": 2,
"no-path-concat": 2,
"brace-style": [2, "1tbs", { "allowSingleLine": false }],
"comma-style": [2, "last"],
"consistent-this": [2, "that"],
"no-inline-comments": 2,
"no-multiple-empty-lines": [1, {"max": 1}],
"no-nested-ternary": 2,
"space-before-function-paren": [2, "never"],
"space-after-keywords": 1,
"space-before-blocks": 1,
"space-in-parens": 1,
"space-unary-ops": 1,
"spaced-comment": 1,
"max-len": [1, 120, 4],

//
// Disabled
//
"no-loop-func": 0
}
}
9 changes: 9 additions & 0 deletions .gitignore
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/node_modules
.project
.settings/
npm-debug.log
/eslint.xml
/test/*.tap
/test/coverage
/test/vendor
/test/build/data.js
10 changes: 10 additions & 0 deletions .npmignore
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.bowerrc
.eslintrc
.gitmodules
.npmignore
.travis.yml
gulpfile.js
bower.json
dist
karma.config.js
test
9 changes: 9 additions & 0 deletions .travis.yml
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language: node_js
node_js:
- "5"
- "4"
- "0.12"
- "0.11"
- "0.10"
before_install: npm install -g gulp
script: gulp
20 changes: 20 additions & 0 deletions LICENSE
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Copyright (c) 2015 Nic Jansma, http://nicj.net

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
207 changes: 207 additions & 0 deletions README.md
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# usertiming-compression.js

v0.1.0

[http://nicj.net](http://nicj.net)

Licensed under the MIT license

## Introduction

`usertiming-compression.js` compresses data from [UserTiming](http://www.w3.org/TR/user-timing/). A
companion script, `usertiming-decompression.js`, converts the compressed data back to the original form.

[UserTiming](http://www.w3.org/TR/user-timing/) is a [modern browser](http://caniuse.com/#feat=user-timing) performance API that gives developers the ability the mark important events (timestamps) and measure durations (timestamp deltas) in their web apps. The [PerformanceTimeline](http://www.w3.org/TR/performance-timeline/) has several methods such as
`performance.getEntriesByType('mark')` or `performance.getEntriesByType('measure')` that return each mark or measure's `startTime` (timestamp) and `duration` (for measures).

`usertiming-compression.js` applies several data-compression techniques to reduce the size of your serialized
UserTiming data to 10-15% of it's original size in many cases. See
[this blog post](http://nicj.net/compressing-usertiming/) for a description of these techniques.

`usertiming-decompression.js` is a companion script that will take the compressed UserTiming data and
build it back to its original UserTiming form (eg. `performance.getEntriesByType('mark')`) for analysis.

## Download

Releases are available for download from [GitHub](https://github.com/nicjansma/usertiming-compression.js).

### Web - Compression

__Development:__ [usertiming-compression.js](https://github.com/nicjansma/usertiming-compression.js/raw/master/src/usertiming-compression.js) - 19kb

__Production:__ [usertiming-compression.min.js](https://github.com/nicjansma/usertiming-compression.js/raw/master/dist/usertiming-compression.min.js) - 3.9kb minified, 1.6kb gzipped

### Web - Decompression

__Development:__ [usertiming-decompression.js](https://github.com/nicjansma/usertiming-compression.js/raw/master/src/usertiming-decompression.js) - 15.9kb

__Production:__ [usertiming-decompression.min.js](https://github.com/nicjansma/usertiming-compression.js/raw/master/dist/usertiming-decompression.min.js) - 3.7kb minified, 1.5kb gzipped

### NPM

usertiming-compression.js is also available as the [npm usertiming-compression module](https://npmjs.org/package/usertiming-compression). You can install
using Node Package Manager (npm):

npm install usertiming-compression

### Bower

usertiming-compression.js is also available via [bower](http://bower.io/). You can install using:

bower install usertiming-compression

## Usage

Please see the [W3C UserTiming API Reference](http://www.w3.org/TR/user-timing/) for details on how to use the
UserTiming API.

### usertiming-compression.js

To include usertiming-compression.js, include it via a script tag:

```html
<script type="text/javascript" src="usertiming-compression.min.js"></script>
```

Once included in the page, a top-level `UserTimingCompression` object is available on `window`. If AMD or CommonJS environments are detected, it will expose itself via those methods.

From the NPM module:

```js
var UserTimingCompression = require("usertiming-compression").UserTimingCompression;
```

To get a map of compressed UserTiming names to values, you can call:

```js
var utMap = UserTimingCompression.getCompressedUserTiming(options);
// {
// "mark1": "2s",
// "mark2": "5k",
// "mark3": "8c"
// }
```

If you have a [map](http://nicj.net/compressing-usertiming/) of mark / measure names you want to use, pass them in as `options.map`:

```js
var utMap = UserTimingCompression.getCompressedUserTiming({
map: {
"mark1": 0,
"mark2": 1,
"mark3": 2
}
});
// {
// "0": "2s",
// "1": "5k",
// "2": "8c"
// }
```

If you want to further compress this list for a format suitable for URL transmission (e.g. on a query string), you can use `compressForUri()`:

```js
var utData = UserTimingCompression.compressForUri(utMap);
// ~(m~(ark~(1~'2s~2~'5k~3~'8c)))
```

### API

#### `UserTimingCompression.getCompressedUserTiming(options)`

Gathers all UserTiming marks and measures from the root HTML page and all accessible IFRAMEs.

**Arguments**:
* `options` (optional)
* `options.map`: A map of names to indexes to use for compression.
* `options.from`: The minimum `startTime`
* `options.to`: The maximum `startTime`

**Returns**: A map of names to compressed values.

```js
{
"mark1": "2s",
"mark2": "5k",
"mark3": "8c"
}
```

#### `UserTimingCompression.compressForUri(map)`

Takes the output of `getCompressedUserTiming()` and converts it into a string suitable for URI encoding.

**Arguments**:
* `map` A map of names to string values

**Returns**: A map of names to compressed values.

```
"~(m~(ark~(1~'2s~2~'5k~3~'8c)))"
```

**Note**: The first character of the string denotes what type of [compression](http://nicj.net/compressing-usertiming/) is used:

1. `~` is optimized Trie (JSURL) compression
2. `0` is a tilde array
3. `1` is a mapped array

### usertiming-decompression.js

To include usertiming-decompression.js, include it via a script tag:

```html
<script type="text/javascript" src="usertiming-decompression.min.js"></script>
```

Once included in the page, a top-level `UserTimingDecompression` object is available on `window`. If AMD or CommonJS environments are detected, it will expose itself via those methods.

From the NPM module:

```js
var UserTimingDecompression = require("usertiming-compression").UserTimingDecompression;
```

To decompress your resources, you can call:

```js
var original = UserTimingDecompression.decompressUserTiming(utData);
```

### API

#### `UserTimingDecompression.decompressUserTiming(data)`

Decompresses data from a URI-encoded form.

**Arguments**:
* `data` Data compressed via `compressForUri()`

**Returns**: The original UserTiming data

```js
[
{"duration":0,"entryType":"mark","name":"mark1","startTime":100},
{"duration":0,"entryType":"mark","name":"mark1","startTime":150},
{"duration":0,"entryType":"mark","name":"mark1","startTime":500}
]
```

## Tests

Tests are provided in the ``test/`` directory, and can be run via ``mocha``:

mocha test/*

Or via ``gulp``:

gulp test

## Version History

* v0.1.0 - 2015-12-10: Initial version

## Thanks

Parts of [JSURL](https://github.com/Sage/jsurl) were incorporated into this library. This project builds upon the work of [ResourceTiming Compression](https://github.com/nicjansma/resourcetiming-compression.js), with guidance from [Philip Tellis](http://bluesmoon.info/) and others at [SOASTA](http://www.soasta.com).
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