149 lines
5.1 KiB
Python
149 lines
5.1 KiB
Python
# Copyright 2015, 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import platform
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import struct
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import threading
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import typing
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from synapse.storage.engines import BaseDatabaseEngine
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from synapse.storage.types import Connection
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if typing.TYPE_CHECKING:
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import sqlite3 # noqa: F401
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class Sqlite3Engine(BaseDatabaseEngine["sqlite3.Connection"]):
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def __init__(self, database_module, database_config):
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super().__init__(database_module, database_config)
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database = database_config.get("args", {}).get("database")
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self._is_in_memory = database in (
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None,
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":memory:",
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)
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if platform.python_implementation() == "PyPy":
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# pypy's sqlite3 module doesn't handle bytearrays, convert them
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# back to bytes.
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database_module.register_adapter(bytearray, lambda array: bytes(array))
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# The current max state_group, or None if we haven't looked
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# in the DB yet.
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self._current_state_group_id = None
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self._current_state_group_id_lock = threading.Lock()
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@property
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def single_threaded(self) -> bool:
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return True
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@property
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def can_native_upsert(self):
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"""
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Do we support native UPSERTs? This requires SQLite3 3.24+, plus some
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more work we haven't done yet to tell what was inserted vs updated.
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"""
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return self.module.sqlite_version_info >= (3, 24, 0)
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@property
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def supports_using_any_list(self):
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"""Do we support using `a = ANY(?)` and passing a list"""
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return False
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@property
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def supports_returning(self) -> bool:
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"""Do we support the `RETURNING` clause in insert/update/delete?"""
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return self.module.sqlite_version_info >= (3, 35, 0)
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def check_database(self, db_conn, allow_outdated_version: bool = False):
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if not allow_outdated_version:
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version = self.module.sqlite_version_info
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# Synapse is untested against older SQLite versions, and we don't want
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# to let users upgrade to a version of Synapse with broken support for their
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# sqlite version, because it risks leaving them with a half-upgraded db.
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if version < (3, 22, 0):
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raise RuntimeError("Synapse requires sqlite 3.22 or above.")
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def check_new_database(self, txn):
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"""Gets called when setting up a brand new database. This allows us to
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apply stricter checks on new databases versus existing database.
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"""
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def convert_param_style(self, sql):
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return sql
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def on_new_connection(self, db_conn):
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# We need to import here to avoid an import loop.
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from synapse.storage.prepare_database import prepare_database
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if self._is_in_memory:
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# In memory databases need to be rebuilt each time. Ideally we'd
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# reuse the same connection as we do when starting up, but that
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# would involve using adbapi before we have started the reactor.
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prepare_database(db_conn, self, config=None)
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db_conn.create_function("rank", 1, _rank)
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db_conn.execute("PRAGMA foreign_keys = ON;")
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db_conn.commit()
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def is_deadlock(self, error):
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return False
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def is_connection_closed(self, conn):
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return False
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def lock_table(self, txn, table):
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return
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@property
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def server_version(self):
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"""Gets a string giving the server version. For example: '3.22.0'
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Returns:
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string
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"""
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return "%i.%i.%i" % self.module.sqlite_version_info
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def in_transaction(self, conn: Connection) -> bool:
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return conn.in_transaction # type: ignore
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def attempt_to_set_autocommit(self, conn: Connection, autocommit: bool):
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# Twisted doesn't let us set attributes on the connections, so we can't
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# set the connection to autocommit mode.
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pass
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# Following functions taken from: https://github.com/coleifer/peewee
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def _parse_match_info(buf):
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bufsize = len(buf)
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return [struct.unpack("@I", buf[i : i + 4])[0] for i in range(0, bufsize, 4)]
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def _rank(raw_match_info):
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"""Handle match_info called w/default args 'pcx' - based on the example rank
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function http://sqlite.org/fts3.html#appendix_a
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"""
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match_info = _parse_match_info(raw_match_info)
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score = 0.0
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p, c = match_info[:2]
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for phrase_num in range(p):
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phrase_info_idx = 2 + (phrase_num * c * 3)
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for col_num in range(c):
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col_idx = phrase_info_idx + (col_num * 3)
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x1, x2 = match_info[col_idx : col_idx + 2]
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if x1 > 0:
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score += float(x1) / x2
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return score
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