GitHub/PyLink
3
0
Fork 0
mirror of https://github.com/jlu5/PyLink.git synced 2024-12-25 20:22:45 +01:00
Code Issues Projects Releases Wiki Activity

writing-plugins: mention that editing hook payloads is allowed

Browse Source 
Part of #452.
This commit is contained in:
James Lu 2019-06-27 12:49:41 -07:00
parent 9ad2b03833
commit 93f608a504
1 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
docs/technical/writing-plugins.md
View File

@ -1,5 +1,7 @@
# Writing plugins for PyLink
***Last updated for 2.1-alpha2 (2019-06-27).***
Most features in PyLink (Relay, Automode, etc.) are implemented as plugins, which can be mix-and-matched on any particular instance. Without any plugins loaded, PyLink can connect to servers but won't accomplish anything useful.
This guide, along with the sample plugin [`example.py`](../../plugins/example.py) aim to show the basics of writing plugins for PyLink.
@ -21,7 +23,7 @@ Functions intended to be hook handlers therefore take in 4 arguments correspondi
#### Return codes for hook handlers
As of PyLink 2.0-alpha3, the return value of hook handlers are used to determine how the original event will be passed on to further handlers (that is, those created by plugins loaded later, or hook handlers registered with a lower priority).
As of PyLink 2.0, the return value of hook handlers are used to determine how the original event will be passed on to further handlers (that is, those created by plugins loaded later, or hook handlers registered with a lower priority).
The following return values are supported so far:
@ -30,7 +32,14 @@ The following return values are supported so far:
Hook handlers may raise exceptions without blocking the event from reaching further handlers; these are caught by PyLink and logged appropriately.
#### Modifying a hook payload
As of PyLink 2.1, it is acceptable to modify a hook event payload in any plugin handler. This can be used for filtering purposes, e.g. Antispam's part/quit message filtering.
You should take extra caution not to corrupt hook payloads, especially ones that relate to state keeping. Otherwise, other plugins may fail to function correctly.
### Hook priorities
The `priority` option in `utils.add_hook()` allows setting a hook handler's priority when binding it. When multiple modules bind to one hook command, handlers are called in order of decreasing priority (i.e. highest first).
There is no standard for hook priorities as of 2.0; instead they are declared as necessary. Some priority values used in 2.0 are shown here for reference (the default priority for handlers is **100**):