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# -*- coding: utf-8 -*- |
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from __future__ import unicode_literals |
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from collections import Iterable |
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from functools import wraps |
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from time import time |
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from django.db.backends.utils import CursorWrapper |
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from django.db.models.query import EmptyResultSet |
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from django.db.models.signals import post_migrate |
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from django.db.models.sql.compiler import ( |
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SQLCompiler, SQLInsertCompiler, SQLUpdateCompiler, SQLDeleteCompiler) |
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from django.db.transaction import Atomic, get_connection |
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from .api import invalidate |
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from .cache import cachalot_caches |
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from .settings import cachalot_settings |
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from .utils import ( |
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_get_query_cache_key, _get_table_cache_keys, _get_tables_from_sql, |
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_invalidate_table, UncachableQuery, TUPLE_OR_LIST) |
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WRITE_COMPILERS = (SQLInsertCompiler, SQLUpdateCompiler, SQLDeleteCompiler) |
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def _unset_raw_connection(original): |
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def inner(compiler, *args, **kwargs): |
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compiler.connection.raw = False |
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out = original(compiler, *args, **kwargs) |
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compiler.connection.raw = True |
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return out |
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return inner |
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def _get_result_or_execute_query(execute_query_func, cache, |
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cache_key, table_cache_keys): |
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data = cache.get_many(table_cache_keys + [cache_key]) |
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new_table_cache_keys = set(table_cache_keys) |
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new_table_cache_keys.difference_update(data) |
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if new_table_cache_keys: |
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now = time() |
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cache.set_many({k: now for k in new_table_cache_keys}, None) |
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elif cache_key in data: |
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timestamp, result = data.pop(cache_key) |
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table_times = data.values() |
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if table_times and timestamp > max(table_times): |
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return result |
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result = execute_query_func() |
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if isinstance(result, Iterable) and result.__class__ not in TUPLE_OR_LIST: |
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result = list(result) |
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cache.set(cache_key, (time(), result), None) |
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return result |
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def _patch_compiler(original): |
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@wraps(original) |
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@_unset_raw_connection |
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def inner(compiler, *args, **kwargs): |
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execute_query_func = lambda: original(compiler, *args, **kwargs) |
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if not cachalot_settings.CACHALOT_ENABLED \ |
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or isinstance(compiler, WRITE_COMPILERS): |
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return execute_query_func() |
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try: |
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cache_key = _get_query_cache_key(compiler) |
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table_cache_keys = _get_table_cache_keys(compiler) |
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except (EmptyResultSet, UncachableQuery): |
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return execute_query_func() |
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return _get_result_or_execute_query( |
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execute_query_func, |
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cachalot_caches.get_cache(db_alias=compiler.using), |
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cache_key, table_cache_keys) |
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return inner |
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def _patch_write_compiler(original): |
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@wraps(original) |
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@_unset_raw_connection |
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def inner(write_compiler, *args, **kwargs): |
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db_alias = write_compiler.using |
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table = write_compiler.query.get_meta().db_table |
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_invalidate_table(cachalot_caches.get_cache(db_alias=db_alias), |
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db_alias, table) |
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return original(write_compiler, *args, **kwargs) |
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return inner |
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def _patch_orm(): |
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SQLCompiler.execute_sql = _patch_compiler(SQLCompiler.execute_sql) |
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for compiler in WRITE_COMPILERS: |
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compiler.execute_sql = _patch_write_compiler(compiler.execute_sql) |
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def _patch_cursor(): |
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def _patch_cursor_execute(original): |
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@wraps(original) |
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def inner(cursor, sql, *args, **kwargs): |
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out = original(cursor, sql, *args, **kwargs) |
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if getattr(cursor.db, 'raw', True) \ |
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and cachalot_settings.CACHALOT_INVALIDATE_RAW: |
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sql = sql.lower() |
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if not isinstance(sql, unicode): |
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sql = unicode(sql, 'utf-8') |
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if unicode('update') in sql or unicode('insert') in sql or unicode('delete') in sql: |
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tables = _get_tables_from_sql(cursor.db, sql) |
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invalidate(*tables, db_alias=cursor.db.alias) |
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return out |
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return inner |
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CursorWrapper.execute = _patch_cursor_execute(CursorWrapper.execute) |
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CursorWrapper.executemany = _patch_cursor_execute(CursorWrapper.executemany) |
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def _patch_atomic(): |
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def patch_enter(original): |
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@wraps(original) |
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def inner(self): |
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cachalot_caches.enter_atomic(self.using) |
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original(self) |
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return inner |
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def patch_exit(original): |
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@wraps(original) |
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def inner(self, exc_type, exc_value, traceback): |
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needs_rollback = get_connection(self.using).needs_rollback |
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original(self, exc_type, exc_value, traceback) |
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cachalot_caches.exit_atomic( |
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self.using, exc_type is None and not needs_rollback) |
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return inner |
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Atomic.__enter__ = patch_enter(Atomic.__enter__) |
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Atomic.__exit__ = patch_exit(Atomic.__exit__) |
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def _invalidate_on_migration(sender, **kwargs): |
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invalidate(*sender.get_models(), db_alias=kwargs['using']) |
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def patch(): |
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post_migrate.connect(_invalidate_on_migration) |
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_patch_cursor() |
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_patch_atomic() |
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_patch_orm() |
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noripyt /
django-cachalot
