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
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
# -*- coding: utf-8 -*-
# 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 sqlite3
import struct
import threading
from synapse.storage.engines import BaseDatabaseEngine
class Sqlite3Engine(BaseDatabaseEngine[sqlite3.Connection]):
def __init__(self, database_module, database_config):
super().__init__(database_module, database_config)
database = database_config.get("args", {}).get("database")
self._is_in_memory = database in (None, ":memory:",)
# The current max state_group, or None if we haven't looked
# in the DB yet.
self._current_state_group_id = None
self._current_state_group_id_lock = threading.Lock()
@property
def single_threaded(self) -> bool:
return True
@property
def can_native_upsert(self):
"""
Do we support native UPSERTs? This requires SQLite3 3.24+, plus some
more work we haven't done yet to tell what was inserted vs updated.
"""
return self.module.sqlite_version_info >= (3, 24, 0)
@property
def supports_tuple_comparison(self):
"""
Do we support comparing tuples, i.e. `(a, b) > (c, d)`? This requires
SQLite 3.15+.
"""
return self.module.sqlite_version_info >= (3, 15, 0)
@property
def supports_using_any_list(self):
"""Do we support using `a = ANY(?)` and passing a list
"""
return False
def check_database(self, db_conn, allow_outdated_version: bool = False):
if not allow_outdated_version:
version = self.module.sqlite_version_info
if version < (3, 11, 0):
raise RuntimeError("Synapse requires sqlite 3.11 or above.")
def check_new_database(self, txn):
"""Gets called when setting up a brand new database. This allows us to
apply stricter checks on new databases versus existing database.
"""
def convert_param_style(self, sql):
return sql
def on_new_connection(self, db_conn):
# We need to import here to avoid an import loop.
from synapse.storage.prepare_database import prepare_database
if self._is_in_memory:
# In memory databases need to be rebuilt each time. Ideally we'd
# reuse the same connection as we do when starting up, but that
# would involve using adbapi before we have started the reactor.
prepare_database(db_conn, self, config=None)
db_conn.create_function("rank", 1, _rank)
def is_deadlock(self, error):
return False
def is_connection_closed(self, conn):
return False
def lock_table(self, txn, table):
return
def get_next_state_group_id(self, txn):
"""Returns an int that can be used as a new state_group ID
"""
# We do application locking here since if we're using sqlite then
# we are a single process synapse.
with self._current_state_group_id_lock:
if self._current_state_group_id is None:
txn.execute("SELECT COALESCE(max(id), 0) FROM state_groups")
self._current_state_group_id = txn.fetchone()[0]
self._current_state_group_id += 1
return self._current_state_group_id
@property
def server_version(self):
"""Gets a string giving the server version. For example: '3.22.0'
Returns:
string
"""
return "%i.%i.%i" % self.module.sqlite_version_info
# Following functions taken from: https://github.com/coleifer/peewee
def _parse_match_info(buf):
bufsize = len(buf)
return [struct.unpack("@I", buf[i : i + 4])[0] for i in range(0, bufsize, 4)]
def _rank(raw_match_info):
"""Handle match_info called w/default args 'pcx' - based on the example rank
function http://sqlite.org/fts3.html#appendix_a
"""
match_info = _parse_match_info(raw_match_info)
score = 0.0
p, c = match_info[:2]
for phrase_num in range(p):
phrase_info_idx = 2 + (phrase_num * c * 3)
for col_num in range(c):
col_idx = phrase_info_idx + (col_num * 3)
x1, x2 = match_info[col_idx : col_idx + 2]
if x1 > 0:
score += float(x1) / x2
return score
|
