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Capture and replay execution traces of client-side web applications

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Reanimator
==========

**Capture and replay JavaScript applications**

Reanimator captures non-deterministic input to a JavaScript application in a log
that can replayed at a later date. It was originally designed for recording web
application crashes in the wild for later debugging, but it may be useful for
other purposes, such as usability testing and tutorials.

Reanimator consists of a core, which is responsible for capture setup and
driving the replay, and one or more [plugins](#reanimatorplug), which are
responsible for capturing and replaying non-deterministic input.

Reanimator ships with plugins for capturing and replaying random numbers, dates,
and timer interrupts. In addition, Reanimator provides plugins for capturing and
replaying callback invocations in the following frameworks:

- jQuery 1.8.3

Reanimator was inspired by
[Mugshot](http://research.microsoft.com/apps/pubs/default.aspx?id=120937) by
[James Mickens](http://research.microsoft.com/en-us/people/mickens/), [Jeremy
Elson](http://research.microsoft.com/en-us/people/jelson/), and [Jon
Howell](http://research.microsoft.com/en-us/people/howell/).

## Demos

[Tile game](http://waterfallengineering.github.com/reanimator/tile-game/index.html)

# API

## Reanimator.capture
**Capture non-deterministic input**

Call this method to begin logging non-deterministic input to your
JavaScript application. To capture a useful log, you must call
`Reanimator.capture` before such input occurs, but after libraries like
jQuery have been loaded.

The log is reset whenever this method is called.

## Reanimator.replay
**Replay a log of non-deterministic input**

### Arguments

- `log` - *object* - the log to replay, in the format emitted by
  `Reanimator.flush`
- `config` - *object* - configuration object
  - `config.delay` - *string* | *integer* - how long Reanimator should wait
    before replaying the next event in the log
      
      For a fixed delay, specify the number of ms between steps (the
      default is 0). If the string `'realtime'` is specified, Reanimator
      will make a good faith effort to replay the events with the actual
      delays recorded in the log.

## Reanimator.flush
**Return a copy of the current log**

Returns a copy of the current log as an object with the following
properties:

- `dates` - [ *number* ] - captured dates, specified in ms since the epoch
- `random` - [ *number* ] - captured random numbers generated by
  `Math.random`
- `events` - [ *object* ] - captured callback invocations

Each element is an object with the following properties:
  - `type` - *string* - the type of the recorded callback
  - `time` - *number* - the time the callback was fired (ms since the epoch)
  - `details` - *any* - any additional details necessary to replay the
    callback

## Reanimator.cleanUp
**Stop capturing or replaying and restore native methods and objects**

This method does *not* clear the most recent log.

## Reanimator.plug
**Install a plugin to capture and replay some non-deterministic input**

### Arguments

- `type` - *string* - a unique string corresponding to the `type` property
  of any events the plugin will log
- `plugin` - *object* - the plugin to install

A plugin is an object that implements the following methods:

- `init`: initialize the plugin

Called once, by `plug`

Arguments
  - `native` - *object* - an object to store a reference to any native
    methods or objects the plugin interposes on

- `capture`: prepare to capture the input the plugin is responsible for

Called by `Reanimator.capture`

- `cleanUp` - restore any native methods or objects the plugin interposed
  on

- `beforeReplay` - prepare to replay

**Optional**; called by `Reanimator.replay` immediately before the
    first event is replayed

Arguments
  - `log` - *object* - the log to be replayed
  - `config` - *object* - the replay configuration

- `replay` - replay a captured event

**Required** if the plugin logs to `events`, **optional** otherwise

Arguments
  - `event` - *object* - the event to replay, in the format specified above
    in `Reanimator.flush`

# License

Reanimator is made available under the [MIT
License](http://opensource.org/licenses/mit-license.php).

# Acknowledgements and Attribution

Thanks to [James Mickens](http://research.microsoft.com/en-us/people/mickens/),
[Jeremy Elson](http://research.microsoft.com/en-us/people/jelson/), and [Jon
Howell](http://research.microsoft.com/en-us/people/howell/) for their excellent
work on
[Mugshot](http://research.microsoft.com/apps/pubs/default.aspx?id=120937), which
inspired Reanimator.

The image `demos/tile-game/img/reanimator.jpg` is the work [Re-Animator]
(http://fav.me/d24n0v9) and is copyright (c) 2009
[~cool-slayer](http://cool-slayer.deviantart.com/) and made available under an
[Attribution-Noncommercial-No Derivative Works 3.0
License](http://creativecommons.org/licenses/by-nc-nd/3.0/).

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