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PyLink/docs/technical/hooks-reference.md
2015-12-26 16:47:25 -08:00

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# PyLink hooks reference
## Introduction
In PyLink, protocol modules communicate with plugins through a system of hooks. This has the benefit of being IRCd-independent, allowing most plugins to function regardless of the IRCd being used.
Each hook payload is formatted as a Python `list`, with three arguments `(numeric, command, args)`:
1) **numeric**: The sender of the message (UID).
2) **command**: The command name (hook name) of the payload. These are *always* UPPERCASE, and those starting with "PYLINK_" indicate hooks sent out by IRC objects themselves, that don't require protocol modules to send.
3) **args**: The hook data (args), a Python `dict`, with different data keys depending on the command given.
Note that the `ts` key is *automatically added* (using the current time) to all hook data dicts that don't include it - such a key should only be provided if the command the uplink IRCd send has a TS value itself.
### Example syntax
The command `:42XAAAAAB PRIVMSG #endlessvoid :test` would result in the following raw hook data:
- `['42XAAAAAB', 'PRIVMSG', {'target': '#endlessvoid', 'text': 'test', 'ts': 1451174041}]`
On UnrealIRCd, because SETHOST is mapped to CHGHOST, `:GL SETHOST blah` would return the raw hook data of this (with the nick converted into UID by the UnrealIRCd protocol module):
- `['001ZJZW01', 'CHGHOST', {'ts': 1451174512, 'target': '001ZJZW01', 'newhost': 'blah'}]`
Some hooks, like MODE, are more complex and can include the entire state of a channel! This will be further described later. `:GL MODE #chat +o PyLink-devel` is converted into (pretty-printed for readability):
```
['001ZJZW01',
'MODE',
{'modes': [('+o', '38QAAAAAA')],
'oldchan': {'modes': set(),
'prefixmodes': {'admins': set(),
'halfops': set(),
'ops': set(),
'owners': set(),
'voices': set()},
'topic': '',
'topicset': False,
'ts': 1451169448,
'users': {'38QAAAAAA', '001ZJZW01'}},
'target': '#chat',
'ts': 1451174702}]
```
## Core hooks
The following hooks are required for PyLink's basic functioning.
- **ENDBURST**: `{}` - Although the hook data is empty, this should be sent whenever a server finishes its burst. The sender should be the server that finishes bursting.
<br>
Plugins like Relay need this to know that the uplink has finished bursting all its users!
- **PYLINK_DISCONNECT**: `{}` - This is sent to plugins by the IRC objects when their network has disconnected. The sender (numeric) is **None** in this case.
- **PYLINK_SPAWNMAIN**: `{'olduser': olduserobj}` - This is sent whenever `Irc.spawnMain()` is called to (re)spawn the main PyLink client, for example to rejoin it from a KILL. It basically tells plugins that the UID of the main PyLink client has changed, while giving them the old data too.
## IRC command hooks
The following hooks represent regular IRC commands sent between servers.
<br><br>
(under construction)