|
1
|
|
|
# coding: utf-8 |
|
2
|
|
|
|
|
3
|
|
|
from __future__ import unicode_literals |
|
4
|
|
|
from collections import Iterable |
|
5
|
|
|
from functools import wraps |
|
6
|
|
|
from time import time |
|
7
|
|
|
|
|
8
|
|
|
from django.db.backends.utils import CursorWrapper |
|
9
|
|
|
from django.db.models.query import EmptyResultSet |
|
10
|
|
|
from django.db.models.signals import post_migrate |
|
11
|
|
|
from django.db.models.sql.compiler import ( |
|
12
|
|
|
SQLCompiler, SQLInsertCompiler, SQLUpdateCompiler, SQLDeleteCompiler, |
|
13
|
|
|
) |
|
14
|
|
|
from django.db.transaction import Atomic, get_connection |
|
15
|
|
|
from django.utils.six import binary_type |
|
16
|
|
|
|
|
17
|
|
|
from .api import invalidate |
|
18
|
|
|
from .cache import cachalot_caches |
|
19
|
|
|
from .settings import cachalot_settings, ITERABLES |
|
20
|
|
|
from .utils import ( |
|
21
|
|
|
_get_table_cache_keys, _get_tables_from_sql, |
|
22
|
|
|
UncachableQuery, is_cachable, filter_cachable, |
|
23
|
|
|
) |
|
24
|
|
|
|
|
25
|
|
|
|
|
26
|
|
|
WRITE_COMPILERS = (SQLInsertCompiler, SQLUpdateCompiler, SQLDeleteCompiler) |
|
27
|
|
|
|
|
28
|
|
|
|
|
29
|
|
|
def _unset_raw_connection(original): |
|
30
|
|
|
def inner(compiler, *args, **kwargs): |
|
31
|
|
|
compiler.connection.raw = False |
|
32
|
|
|
out = original(compiler, *args, **kwargs) |
|
33
|
|
|
compiler.connection.raw = True |
|
34
|
|
|
return out |
|
35
|
|
|
return inner |
|
36
|
|
|
|
|
37
|
|
|
|
|
38
|
|
|
def _get_result_or_execute_query(execute_query_func, cache, |
|
39
|
|
|
cache_key, table_cache_keys): |
|
40
|
|
|
data = cache.get_many(table_cache_keys + [cache_key]) |
|
41
|
|
|
|
|
42
|
|
|
new_table_cache_keys = set(table_cache_keys) |
|
43
|
|
|
new_table_cache_keys.difference_update(data) |
|
44
|
|
|
|
|
45
|
|
|
if new_table_cache_keys: |
|
46
|
|
|
now = time() |
|
47
|
|
|
cache.set_many({k: now for k in new_table_cache_keys}, |
|
48
|
|
|
cachalot_settings.CACHALOT_TIMEOUT) |
|
49
|
|
|
elif cache_key in data: |
|
50
|
|
|
timestamp, result = data.pop(cache_key) |
|
51
|
|
|
table_times = data.values() |
|
52
|
|
|
if table_times and timestamp > max(table_times): |
|
53
|
|
|
return result |
|
54
|
|
|
|
|
55
|
|
|
result = execute_query_func() |
|
56
|
|
|
if result.__class__ not in ITERABLES and isinstance(result, Iterable): |
|
57
|
|
|
result = list(result) |
|
58
|
|
|
|
|
59
|
|
|
cache.set(cache_key, (time(), result), cachalot_settings.CACHALOT_TIMEOUT) |
|
60
|
|
|
|
|
61
|
|
|
return result |
|
62
|
|
|
|
|
63
|
|
|
|
|
64
|
|
|
def _patch_compiler(original): |
|
65
|
|
|
@wraps(original) |
|
66
|
|
|
@_unset_raw_connection |
|
67
|
|
|
def inner(compiler, *args, **kwargs): |
|
68
|
|
|
execute_query_func = lambda: original(compiler, *args, **kwargs) |
|
69
|
|
|
db_alias = compiler.using |
|
70
|
|
|
if not cachalot_settings.CACHALOT_ENABLED \ |
|
71
|
|
|
or db_alias not in cachalot_settings.CACHALOT_DATABASES \ |
|
72
|
|
|
or isinstance(compiler, WRITE_COMPILERS): |
|
73
|
|
|
return execute_query_func() |
|
74
|
|
|
|
|
75
|
|
|
try: |
|
76
|
|
|
cache_key = cachalot_settings.CACHALOT_QUERY_KEYGEN(compiler) |
|
77
|
|
|
table_cache_keys = _get_table_cache_keys(compiler) |
|
78
|
|
|
except (EmptyResultSet, UncachableQuery): |
|
79
|
|
|
return execute_query_func() |
|
80
|
|
|
|
|
81
|
|
|
return _get_result_or_execute_query( |
|
82
|
|
|
execute_query_func, |
|
83
|
|
|
cachalot_caches.get_cache(db_alias=db_alias), |
|
84
|
|
|
cache_key, table_cache_keys) |
|
85
|
|
|
|
|
86
|
|
|
return inner |
|
87
|
|
|
|
|
88
|
|
|
|
|
89
|
|
|
def _patch_write_compiler(original): |
|
90
|
|
|
@wraps(original) |
|
91
|
|
|
@_unset_raw_connection |
|
92
|
|
|
def inner(write_compiler, *args, **kwargs): |
|
93
|
|
|
db_alias = write_compiler.using |
|
94
|
|
|
table = write_compiler.query.get_meta().db_table |
|
95
|
|
|
if is_cachable(table): |
|
96
|
|
|
invalidate(table, db_alias=db_alias, |
|
97
|
|
|
cache_alias=cachalot_settings.CACHALOT_CACHE) |
|
98
|
|
|
return original(write_compiler, *args, **kwargs) |
|
99
|
|
|
|
|
100
|
|
|
return inner |
|
101
|
|
|
|
|
102
|
|
|
|
|
103
|
|
|
def _patch_orm(): |
|
104
|
|
|
SQLCompiler.execute_sql = _patch_compiler(SQLCompiler.execute_sql) |
|
105
|
|
|
for compiler in WRITE_COMPILERS: |
|
106
|
|
|
compiler.execute_sql = _patch_write_compiler(compiler.execute_sql) |
|
107
|
|
|
|
|
108
|
|
|
|
|
109
|
|
|
def _patch_cursor(): |
|
110
|
|
|
def _patch_cursor_execute(original): |
|
111
|
|
|
@wraps(original) |
|
112
|
|
|
def inner(cursor, sql, *args, **kwargs): |
|
113
|
|
|
out = original(cursor, sql, *args, **kwargs) |
|
114
|
|
|
connection = cursor.db |
|
115
|
|
|
if getattr(connection, 'raw', True) \ |
|
116
|
|
|
and cachalot_settings.CACHALOT_INVALIDATE_RAW: |
|
117
|
|
|
if isinstance(sql, binary_type): |
|
118
|
|
|
sql = sql.decode('utf-8') |
|
119
|
|
|
sql = sql.lower() |
|
120
|
|
|
if 'update' in sql or 'insert' in sql or 'delete' in sql \ |
|
121
|
|
|
or 'alter' in sql or 'create' in sql or 'drop' in sql: |
|
122
|
|
|
tables = filter_cachable( |
|
123
|
|
|
_get_tables_from_sql(connection, sql)) |
|
124
|
|
|
if tables: |
|
125
|
|
|
invalidate(*tables, db_alias=connection.alias, |
|
126
|
|
|
cache_alias=cachalot_settings.CACHALOT_CACHE) |
|
127
|
|
|
return out |
|
128
|
|
|
|
|
129
|
|
|
return inner |
|
130
|
|
|
|
|
131
|
|
|
CursorWrapper.execute = _patch_cursor_execute(CursorWrapper.execute) |
|
132
|
|
|
CursorWrapper.executemany = _patch_cursor_execute(CursorWrapper.executemany) |
|
133
|
|
|
|
|
134
|
|
|
|
|
135
|
|
|
def _patch_atomic(): |
|
136
|
|
|
def patch_enter(original): |
|
137
|
|
|
@wraps(original) |
|
138
|
|
|
def inner(self): |
|
139
|
|
|
cachalot_caches.enter_atomic(self.using) |
|
140
|
|
|
original(self) |
|
141
|
|
|
|
|
142
|
|
|
return inner |
|
143
|
|
|
|
|
144
|
|
|
def patch_exit(original): |
|
145
|
|
|
@wraps(original) |
|
146
|
|
|
def inner(self, exc_type, exc_value, traceback): |
|
147
|
|
|
needs_rollback = get_connection(self.using).needs_rollback |
|
148
|
|
|
original(self, exc_type, exc_value, traceback) |
|
149
|
|
|
cachalot_caches.exit_atomic( |
|
150
|
|
|
self.using, exc_type is None and not needs_rollback) |
|
151
|
|
|
|
|
152
|
|
|
return inner |
|
153
|
|
|
|
|
154
|
|
|
Atomic.__enter__ = patch_enter(Atomic.__enter__) |
|
155
|
|
|
Atomic.__exit__ = patch_exit(Atomic.__exit__) |
|
156
|
|
|
|
|
157
|
|
|
|
|
158
|
|
|
def _invalidate_on_migration(sender, **kwargs): |
|
159
|
|
|
invalidate(*sender.get_models(), db_alias=kwargs['using'], |
|
160
|
|
|
cache_alias=cachalot_settings.CACHALOT_CACHE) |
|
161
|
|
|
|
|
162
|
|
|
|
|
163
|
|
|
def patch(): |
|
164
|
|
|
post_migrate.connect(_invalidate_on_migration) |
|
165
|
|
|
|
|
166
|
|
|
_patch_cursor() |
|
167
|
|
|
_patch_atomic() |
|
168
|
|
|
_patch_orm() |
|
169
|
|
|
|
noripyt /
django-cachalot
