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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
# Copyright 2015, 2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import abc
from typing import Generic, TypeVar
from synapse.storage.types import Connection
class IncorrectDatabaseSetup(RuntimeError):
pass
ConnectionType = TypeVar("ConnectionType", bound=Connection)
class BaseDatabaseEngine(Generic[ConnectionType], metaclass=abc.ABCMeta):
def __init__(self, module, database_config: dict):
self.module = module
@property
@abc.abstractmethod
def single_threaded(self) -> bool:
...
@property
@abc.abstractmethod
def can_native_upsert(self) -> bool:
"""
Do we support native UPSERTs?
"""
...
@property
@abc.abstractmethod
def supports_using_any_list(self) -> bool:
"""
Do we support using `a = ANY(?)` and passing a list
"""
...
@property
@abc.abstractmethod
def supports_returning(self) -> bool:
"""Do we support the `RETURNING` clause in insert/update/delete?"""
...
@abc.abstractmethod
def check_database(
self, db_conn: ConnectionType, allow_outdated_version: bool = False
) -> None:
...
@abc.abstractmethod
def check_new_database(self, txn) -> None:
"""Gets called when setting up a brand new database. This allows us to
apply stricter checks on new databases versus existing database.
"""
...
@abc.abstractmethod
def convert_param_style(self, sql: str) -> str:
...
@abc.abstractmethod
def on_new_connection(self, db_conn: ConnectionType) -> None:
...
@abc.abstractmethod
def is_deadlock(self, error: Exception) -> bool:
...
@abc.abstractmethod
def is_connection_closed(self, conn: ConnectionType) -> bool:
...
@abc.abstractmethod
def lock_table(self, txn, table: str) -> None:
...
@property
@abc.abstractmethod
def server_version(self) -> str:
"""Gets a string giving the server version. For example: '3.22.0'"""
...
@abc.abstractmethod
def in_transaction(self, conn: Connection) -> bool:
"""Whether the connection is currently in a transaction."""
...
@abc.abstractmethod
def attempt_to_set_autocommit(self, conn: Connection, autocommit: bool):
"""Attempt to set the connections autocommit mode.
When True queries are run outside of transactions.
Note: This has no effect on SQLite3, so callers still need to
commit/rollback the connections.
"""
...
|
