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PyLink/docs/technical/hooks-reference.md
2016-01-09 19:18:19 -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': IrcChannel({'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, sent with their correct data keys, are required for PyLink's basic functioning.
- **ENDBURST**: `{}`
- The hook data here is empty.
- This payload should be sent whenever a server finishes its burst, with the SID of the bursted server as the sender.
- Plugins like Relay need this to know that the uplink has finished bursting all its users!
- **PYLINK_DISCONNECT**: `{}`
- This is sent to plugins by IRC object instances whenever their network has disconnected. The sender (numeric) here is always **None**.
- **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.
- Example payload:
- ```
{'olduser': IrcUser({'away': '',
'channels': {'#chat'},
'host': 'pylink-devel.overdrivenetworks.com',
'ident': 'pylink',
'identified': False,
'ip': '0.0.0.0',
'manipulatable': True,
'modes': {('o', None)},
'nick': 'PyLink-devel',
'realhost': 'pylink-devel.overdrivenetworks.com',
'realname': 'PyLink development server',
'ts': 1452393682,
'uid': '7PYAAAAAE'}),
'ts': 1452393899)}
```
## IRC command hooks
The following hooks represent regular IRC commands sent between servers.
<br><br>
(under construction)