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from django.apps import AppConfig |
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from django.conf import settings |
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from django.core.checks import register, Tags, Warning, Error |
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from cachalot.utils import ITERABLES |
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from .monkey_patch import patch |
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from .settings import ( |
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cachalot_settings, SUPPORTED_CACHE_BACKENDS, SUPPORTED_DATABASE_ENGINES, |
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SUPPORTED_ONLY) |
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@register(Tags.caches, Tags.compatibility) |
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def check_cache_compatibility(app_configs, **kwargs): |
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cache = settings.CACHES[cachalot_settings.CACHALOT_CACHE] |
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cache_backend = cache['BACKEND'] |
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if cache_backend not in SUPPORTED_CACHE_BACKENDS: |
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return [Warning( |
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'Cache backend %r is not supported by django-cachalot.' |
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% cache_backend, |
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hint='Switch to a supported cache backend ' |
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'like Redis or Memcached.', |
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id='cachalot.W001')] |
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return [] |
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@register(Tags.database, Tags.compatibility) |
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def check_databases_compatibility(app_configs, **kwargs): |
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errors = [] |
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databases = settings.DATABASES |
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original_enabled_databases = getattr(settings, 'CACHALOT_DATABASES', |
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SUPPORTED_ONLY) |
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enabled_databases = cachalot_settings.CACHALOT_DATABASES |
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if original_enabled_databases == SUPPORTED_ONLY: |
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if not cachalot_settings.CACHALOT_DATABASES: |
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errors.append(Warning( |
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'None of the configured databases are supported ' |
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'by django-cachalot.', |
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hint='Use a supported database, or remove django-cachalot, or ' |
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'put at least one database alias in `CACHALOT_DATABASES` ' |
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'to force django-cachalot to use it.', |
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id='cachalot.W002' |
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)) |
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elif enabled_databases.__class__ in ITERABLES: |
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for db_alias in enabled_databases: |
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if db_alias in databases: |
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engine = databases[db_alias]['ENGINE'] |
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if engine not in SUPPORTED_DATABASE_ENGINES: |
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errors.append(Warning( |
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'Database engine %r is not supported ' |
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'by django-cachalot.' % engine, |
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hint='Switch to a supported database engine.', |
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id='cachalot.W003' |
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)) |
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else: |
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errors.append(Error( |
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'Database alias %r from `CACHALOT_DATABASES` ' |
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'is not defined in `DATABASES`.' % db_alias, |
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hint='Change `CACHALOT_DATABASES` to be compliant with' |
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'`CACHALOT_DATABASES`', |
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id='cachalot.E001', |
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)) |
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if not enabled_databases: |
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errors.append(Warning( |
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'Django-cachalot is useless because no database ' |
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'is configured in `CACHALOT_DATABASES`.', |
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hint='Reconfigure django-cachalot or remove it.', |
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id='cachalot.W004' |
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)) |
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else: |
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errors.append(Error( |
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"`CACHALOT_DATABASES` must be either %r or a list, tuple, " |
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"frozenset or set of database aliases." % SUPPORTED_ONLY, |
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hint='Remove `CACHALOT_DATABASES` or change it.', |
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id='cachalot.E002', |
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)) |
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return errors |
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80
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class CachalotConfig(AppConfig): |
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name = 'cachalot' |
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patched = False |
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def ready(self): |
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cachalot_settings.load() |
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if not self.patched: |
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patch() |
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self.patched = True |
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noripyt /
django-cachalot
