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# -*- 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 struct
import threading
from synapse.storage.prepare_database import prepare_database
class Sqlite3Engine(object):
single_threaded = True
def __init__(self, database_module, database_config):
self.module = database_module
# 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 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)
def check_database(self, txn):
pass
def convert_param_style(self, sql):
return sql
def on_new_connection(self, db_conn):
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
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