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# coding: utf-8 |
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from __future__ import unicode_literals |
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from django.apps import apps |
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from django.conf import settings |
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from django.db import connections |
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from django.utils.six import string_types |
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from .cache import cachalot_caches |
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from .settings import cachalot_settings |
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from .signals import post_invalidation |
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from .transaction import AtomicCache |
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from .utils import _invalidate_tables |
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__all__ = ('invalidate', 'get_last_invalidation') |
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def _cache_db_tables_iterator(tables, cache_alias, db_alias): |
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no_tables = not tables |
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cache_aliases = settings.CACHES if cache_alias is None else (cache_alias,) |
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db_aliases = settings.DATABASES if db_alias is None else (db_alias,) |
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for db_alias in db_aliases: |
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if no_tables: |
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tables = connections[db_alias].introspection.table_names() |
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if tables: |
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for cache_alias in cache_aliases: |
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yield cache_alias, db_alias, tables |
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def _get_tables(tables_or_models): |
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for table_or_model in tables_or_models: |
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if isinstance(table_or_model, string_types) and '.' in table_or_model: |
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try: |
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table_or_model = apps.get_model(table_or_model) |
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except LookupError: |
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pass |
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yield (table_or_model if isinstance(table_or_model, string_types) |
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else table_or_model._meta.db_table) |
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def invalidate(*tables_or_models, **kwargs): |
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""" |
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Clears what was cached by django-cachalot implying one or more SQL tables |
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or models from ``tables_or_models``. |
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If ``tables_or_models`` is not specified, all tables found in the database |
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(including those outside Django) are invalidated. |
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If ``cache_alias`` is specified, it only clears the SQL queries stored |
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on this cache, otherwise queries from all caches are cleared. |
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If ``db_alias`` is specified, it only clears the SQL queries executed |
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on this database, otherwise queries from all databases are cleared. |
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:arg tables_or_models: SQL tables names, models or models lookups |
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(or a combination) |
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:type tables_or_models: tuple of strings or models |
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:arg cache_alias: Alias from the Django ``CACHES`` setting |
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:type cache_alias: string or NoneType |
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:arg db_alias: Alias from the Django ``DATABASES`` setting |
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:type db_alias: string or NoneType |
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:returns: Nothing |
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:rtype: NoneType |
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""" |
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# TODO: Replace with positional arguments when we drop Python 2 support. |
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cache_alias = kwargs.pop('cache_alias', None) |
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db_alias = kwargs.pop('db_alias', None) |
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for k in kwargs: |
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raise TypeError( |
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"invalidate() got an unexpected keyword argument '%s'" % k) |
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send_signal = False |
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invalidated = set() |
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for cache_alias, db_alias, tables in _cache_db_tables_iterator( |
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list(_get_tables(tables_or_models)), cache_alias, db_alias): |
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cache = cachalot_caches.get_cache(cache_alias, db_alias) |
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if not isinstance(cache, AtomicCache): |
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send_signal = True |
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_invalidate_tables(cache, db_alias, tables) |
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invalidated.update(tables) |
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if send_signal: |
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for table in invalidated: |
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post_invalidation.send(table, db_alias=db_alias) |
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def get_last_invalidation(*tables_or_models, **kwargs): |
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""" |
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Returns the timestamp of the most recent invalidation of the given |
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``tables_or_models``. If ``tables_or_models`` is not specified, |
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all tables found in the database (including those outside Django) are used. |
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If ``cache_alias`` is specified, it only fetches invalidations |
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in this cache, otherwise invalidations in all caches are fetched. |
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If ``db_alias`` is specified, it only fetches invalidations |
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for this database, otherwise invalidations for all databases are fetched. |
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:arg tables_or_models: SQL tables names, models or models lookups |
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(or a combination) |
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:type tables_or_models: tuple of strings or models |
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:arg cache_alias: Alias from the Django ``CACHES`` setting |
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:type cache_alias: string or NoneType |
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:arg db_alias: Alias from the Django ``DATABASES`` setting |
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:type db_alias: string or NoneType |
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:returns: The timestamp of the most recent invalidation |
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:rtype: float |
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""" |
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# TODO: Replace with positional arguments when we drop Python 2 support. |
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cache_alias = kwargs.pop('cache_alias', None) |
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db_alias = kwargs.pop('db_alias', None) |
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for k in kwargs: |
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raise TypeError("get_last_invalidation() got an unexpected " |
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"keyword argument '%s'" % k) |
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last_invalidation = 0.0 |
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for cache_alias, db_alias, tables in _cache_db_tables_iterator( |
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list(_get_tables(tables_or_models)), cache_alias, db_alias): |
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get_table_cache_key = cachalot_settings.CACHALOT_TABLE_KEYGEN |
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table_cache_keys = [get_table_cache_key(db_alias, t) for t in tables] |
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invalidations = cachalot_caches.get_cache( |
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cache_alias, db_alias).get_many(table_cache_keys).values() |
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if invalidations: |
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current_last_invalidation = max(invalidations) |
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if current_last_invalidation > last_invalidation: |
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last_invalidation = current_last_invalidation |
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return last_invalidation |
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noripyt /
django-cachalot
