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https://github.com/ArchiveBox/ArchiveBox.git
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80 lines
3.8 KiB
Python
80 lines
3.8 KiB
Python
__package__ = 'archivebox.plugantic'
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import json
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from typing import Optional, List, Literal, ClassVar
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from pathlib import Path
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from pydantic import BaseModel, Field, ConfigDict, computed_field
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HookType = Literal['CONFIG', 'BINPROVIDER', 'BINARY', 'EXTRACTOR', 'REPLAYER', 'CHECK', 'ADMINDATAVIEW']
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hook_type_names: List[HookType] = ['CONFIG', 'BINPROVIDER', 'BINARY', 'EXTRACTOR', 'REPLAYER', 'CHECK', 'ADMINDATAVIEW']
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class BaseHook(BaseModel):
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"""
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A Plugin consists of a list of Hooks, applied to django.conf.settings when AppConfig.read() -> Plugin.register() is called.
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Plugin.register() then calls each Hook.register() on the provided settings.
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each Hook.regsiter() function (ideally pure) takes a django.conf.settings as input and returns a new one back.
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or
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it modifies django.conf.settings in-place to add changes corresponding to its HookType.
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e.g. for a HookType.CONFIG, the Hook.register() function places the hook in settings.CONFIG (and settings.HOOKS)
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An example of an impure Hook would be a CHECK that modifies settings but also calls django.core.checks.register(check).
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setup_django() -> imports all settings.INSTALLED_APPS...
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# django imports AppConfig, models, migrations, admins, etc. for all installed apps
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# django then calls AppConfig.ready() on each installed app...
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builtin_plugins.npm.NpmPlugin().AppConfig.ready() # called by django
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builtin_plugins.npm.NpmPlugin().register(settings) ->
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builtin_plugins.npm.NpmConfigSet().register(settings)
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plugantic.base_configset.BaseConfigSet().register(settings)
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plugantic.base_hook.BaseHook().register(settings, parent_plugin=builtin_plugins.npm.NpmPlugin())
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...
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...
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Both core ArchiveBox code and plugin code depend on python >= 3.10 and django >= 5.0 w/ sqlite and a filesystem.
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Core ArchiveBox code can depend only on python and the pip libraries it ships with, and can never depend on plugin code / node / other binaries.
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Plugin code can depend on archivebox core, other django apps, other pip libraries, and other plugins.
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Plugins can provide BinProviders + Binaries which can depend on arbitrary other binaries / package managers like curl / wget / yt-dlp / etc.
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The execution interface between plugins is simply calling builtinplugins.npm.... functions directly, django handles
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importing all plugin code. There is no need to manually register methods/classes, only register to call
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impure setup functions or provide runtime state.
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settings.CONFIGS / settings.BINPROVIDERS / settings.BINARIES /... etc. are reserved for dynamic runtime state only.
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This state is exposed to the broader system in a flat namespace, e.g. CONFIG.IS_DOCKER=True, or BINARIES = [
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..., Binary('node', abspath='/usr/local/bin/node', version='22.2.0'), ...
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]
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"""
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model_config = ConfigDict(
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extra='allow',
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arbitrary_types_allowed=True,
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from_attributes=True,
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populate_by_name=True,
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validate_defaults=True,
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validate_assignment=True,
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)
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hook_type: HookType = 'CONFIG'
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@property
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def name(self) -> str:
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return f'{self.__module__}.{__class__.__name__}'
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def register(self, settings, parent_plugin=None):
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"""Load a record of an installed hook into global Django settings.HOOKS at runtime."""
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assert json.dumps(self.model_json_schema(), indent=4), f'Hook {self.name} has invalid JSON schema.'
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if settings is None:
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from django.conf import settings as django_settings
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settings = django_settings
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# record installed hook in settings.HOOKS
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self._plugin = parent_plugin # for debugging only, never rely on this!
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settings.HOOKS[self.name] = self
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print('REGISTERED HOOK:', self.name)
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