# heroprotocol.py

heroprotocol.py is a series of reference [Python](https://www.python.org/downloads/) scripts and standalone tool to decode Heroes of the Storm replay files into Python data structures.

Currently heroprotocol can decode these structures and events:

* Replay header
* Game details
* Replay init data
* Game events
* Message events
* Tracker events

heroprotocol can be used as a base-build-specific library to decode binary blobs, or it can be run as a standalone tool to pretty print information from supported replay files.

Note that heroprotocol does not expose game balance information or provide any kind of high level analysis of replays; it's meant to be just the first tool in the chain for your data mining application.

# Supported Versions

heroprotocol supports all Hereos of the Storm replay files that were written with retail versions of the game.

# How to Use

A working installation of Python 2.x is required. From the folder where *heroprotocol* is located, type the following into the command line, assuming that the replay file was also copied into the same folder:

```bash
py heroprotocol.py --[tracker-event-option] "<replayFileName>" > output.txt
```

If you want the output shown directly in the terminal, leave out the `> output.txt`.

## Example Usage

```bash
py heroprotocol.py --details "Blackheart's Bay.StormReplay" > output.txt
```

## Command Line Arguments

    -h, --help          Show the options that are available.

    Tracker Events:
    --gameevents        Print all game events including coordinates
    --messageevents     Print message events such as ping events
    --trackerevents     Print tracker events such as units killed, game stat events,
                        score result event
    --attributeevents   Print attribute events, a table of attrid, namespace, and attribute values
    --header            Print protocol header including build id and elapsedGameLoops
    --details           Print protocol details, e.g. teamId, player names and chosen heroes,
                        player region, game result, observer status
    --initdata          Print protocol initdata, e.g. interface settings for every player

    Output Options:
    --stats             Output stats about the active tracker event to the STDERR stream
    --json              Use JSON syntax for output

# Tracker Events

Some notes on tracker events:

* Convert unit tag index, recycle pairs into unit tags (as seen in game events) with protocol.unit_tag (index, recycle)
* Interpret the NNet.Replay.Tracker.SUnitPositionsEvent events like this:

```python
unitIndex = event['m_firstUnitIndex']
for i in xrange(0, len(event['m_items']), 3):
    unitIndex += event['m_items'][i + 0]
    x = event['m_items'][i + 1] * 4
    y = event['m_items'][i + 2] * 4
    # unit identified by unitIndex at the current event['_gameloop'] time
    # is at approximate position (x, y)
```

* Only units that have inflicted or taken damage are mentioned in unit position events, and they occur periodically with a limit of 256 units mentioned per event.
* NNet.Replay.Tracker.SUnitInitEvent events appear for units under construction. When complete you'll see a NNet.Replay.Tracker.SUnitDoneEvent with the same unit tag.
* NNet.Replay.Tracker.SUnitBornEvent events appear for units that are created fully constructed.
* You may receive a NNet.Replay.Tracker.SUnitDiedEvent after either a UnitInit or UnitBorn event for the corresponding unit tag.
* In NNet.Replay.Tracker.SPlayerStatsEvent, m_scoreValueFoodUsed and m_scoreValueFoodMade are in fixed point (divide by 4096 for integer values). All other values are in integers.
* There's a known issue where revived units are not tracked, and placeholder units track death but not birth.

# Acknowledgements

The standalone tool uses [mpyq](https://github.com/eagleflo/mpyq) to read mopaq files.

Thanks to David Joerg and Graylin Kim of [GGTracker](http://www.ggtracker.com) for design feedback and beta-testing of the s2protocol library that heroprotocol is based upon.

Thanks to Ben Barrett of [HOTSLogs](http://www.hotslogs.com) for feedback on and beta-testing of the heroprotocol library.

# License

Copyright © 2018 Blizzard Entertainment

Open sourced under the MIT license. See the included LICENSE file for more information.