1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
from django.core.exceptions import ImproperlyConfigured
from django.db.utils import DatabaseError
from django.utils.asyncio import async_unsafe
from django_pgschemas.schema import get_current_schema, get_default_schema
from django_pgschemas.settings import (
get_base_backend_module,
get_extra_search_paths,
get_original_backend_module,
)
from django_pgschemas.utils import check_schema_name, get_limit_set_calls
from .introspection import DatabaseSchemaIntrospection
try:
try:
import psycopg as _psycopg
except ImportError:
import psycopg2 as _psycopg
except ImportError:
raise ImproperlyConfigured("Error loading psycopg2 or psycopg module")
try:
module = get_original_backend_module("base")
except AttributeError:
module = get_base_backend_module("base")
def get_search_path(schema=None):
if schema is None:
schema = get_default_schema()
search_path = ["public"] if schema.schema_name == "public" else [schema.schema_name, "public"]
search_path.extend(get_extra_search_paths())
for part in search_path:
check_schema_name(part)
return ", ".join(search_path)
class DatabaseWrapper(module.DatabaseWrapper):
def __init__(self, *args, **kwargs):
self._search_path = None
self._setting_search_path = False
super().__init__(*args, **kwargs)
# Patched version of DatabaseIntrospection that only returns the table list for the currently selected schema
self.introspection = DatabaseSchemaIntrospection(self)
@async_unsafe
def close(self) -> None:
self._search_path = None
self._setting_search_path = False
super().close()
@async_unsafe
def rollback(self) -> None:
self._search_path = None
self._setting_search_path = False
super().rollback()
def _handle_search_path(self, cursor=None):
search_path_for_current_schema = get_search_path(get_current_schema())
skip = self._setting_search_path or (
self._search_path == search_path_for_current_schema and get_limit_set_calls()
)
if not skip:
self._setting_search_path = True
cursor_for_search_path = self.connection.cursor() if cursor is None else cursor
try:
cursor_for_search_path.execute(
f"SET search_path = {search_path_for_current_schema}"
)
except (DatabaseError, _psycopg.InternalError):
self._search_path = None
else:
self._search_path = search_path_for_current_schema
finally:
self._setting_search_path = False
if cursor is None:
cursor_for_search_path.close()
def _cursor(self, name=None):
cursor = super()._cursor(name=name)
cursor_for_search_path = cursor if name is None else None # Named cursors cannot be reused
self._handle_search_path(cursor_for_search_path)
return cursor
|
