forked-synapse/synapse/storage/__init__.py
2014-09-24 11:06:41 +01:00

442 lines
14 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2014 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.
from twisted.internet import defer
from synapse.api.events.room import (
RoomMemberEvent, RoomTopicEvent, FeedbackEvent,
# RoomConfigEvent,
RoomNameEvent,
RoomJoinRulesEvent,
RoomPowerLevelsEvent,
RoomAddStateLevelEvent,
RoomSendEventLevelEvent,
RoomOpsPowerLevelsEvent,
RoomDeletionEvent,
)
from synapse.util.logutils import log_function
from .directory import DirectoryStore
from .feedback import FeedbackStore
from .presence import PresenceStore
from .profile import ProfileStore
from .registration import RegistrationStore
from .room import RoomStore
from .roommember import RoomMemberStore
from .stream import StreamStore
from .pdu import StatePduStore, PduStore, PdusTable
from .transactions import TransactionStore
from .keys import KeyStore
import json
import logging
import os
logger = logging.getLogger(__name__)
SCHEMAS = [
"transactions",
"pdu",
"users",
"profiles",
"presence",
"im",
"room_aliases",
"deletions",
]
# Remember to update this number every time an incompatible change is made to
# database schema files, so the users will be informed on server restarts.
SCHEMA_VERSION = 4
class _RollbackButIsFineException(Exception):
""" This exception is used to rollback a transaction without implying
something went wrong.
"""
pass
class DataStore(RoomMemberStore, RoomStore,
RegistrationStore, StreamStore, ProfileStore, FeedbackStore,
PresenceStore, PduStore, StatePduStore, TransactionStore,
DirectoryStore, KeyStore):
def __init__(self, hs):
super(DataStore, self).__init__(hs)
self.event_factory = hs.get_event_factory()
self.hs = hs
self.min_token_deferred = self._get_min_token()
self.min_token = None
@defer.inlineCallbacks
@log_function
def persist_event(self, event=None, backfilled=False, pdu=None,
is_new_state=True):
stream_ordering = None
if backfilled:
if not self.min_token_deferred.called:
yield self.min_token_deferred
self.min_token -= 1
stream_ordering = self.min_token
try:
yield self.runInteraction(
self._persist_pdu_event_txn,
pdu=pdu,
event=event,
backfilled=backfilled,
stream_ordering=stream_ordering,
is_new_state=is_new_state,
)
except _RollbackButIsFineException as e:
pass
@defer.inlineCallbacks
def get_event(self, event_id, allow_none=False):
events_dict = yield self._simple_select_one(
"events",
{"event_id": event_id},
[
"event_id",
"type",
"room_id",
"content",
"unrecognized_keys"
],
allow_none=allow_none,
)
if not events_dict:
defer.returnValue(None)
event = self._parse_event_from_row(events_dict)
defer.returnValue(event)
def _persist_pdu_event_txn(self, txn, pdu=None, event=None,
backfilled=False, stream_ordering=None,
is_new_state=True):
if pdu is not None:
self._persist_event_pdu_txn(txn, pdu)
if event is not None:
return self._persist_event_txn(
txn, event, backfilled, stream_ordering,
is_new_state=is_new_state,
)
def _persist_event_pdu_txn(self, txn, pdu):
cols = dict(pdu.__dict__)
unrec_keys = dict(pdu.unrecognized_keys)
del cols["content"]
del cols["prev_pdus"]
cols["content_json"] = json.dumps(pdu.content)
unrec_keys.update({
k: v for k, v in cols.items()
if k not in PdusTable.fields
})
cols["unrecognized_keys"] = json.dumps(unrec_keys)
logger.debug("Persisting: %s", repr(cols))
if pdu.is_state:
self._persist_state_txn(txn, pdu.prev_pdus, cols)
else:
self._persist_pdu_txn(txn, pdu.prev_pdus, cols)
self._update_min_depth_for_context_txn(txn, pdu.context, pdu.depth)
@log_function
def _persist_event_txn(self, txn, event, backfilled, stream_ordering=None,
is_new_state=True):
if event.type == RoomMemberEvent.TYPE:
self._store_room_member_txn(txn, event)
elif event.type == FeedbackEvent.TYPE:
self._store_feedback_txn(txn, event)
elif event.type == RoomNameEvent.TYPE:
self._store_room_name_txn(txn, event)
elif event.type == RoomTopicEvent.TYPE:
self._store_room_topic_txn(txn, event)
elif event.type == RoomJoinRulesEvent.TYPE:
self._store_join_rule(txn, event)
elif event.type == RoomPowerLevelsEvent.TYPE:
self._store_power_levels(txn, event)
elif event.type == RoomAddStateLevelEvent.TYPE:
self._store_add_state_level(txn, event)
elif event.type == RoomSendEventLevelEvent.TYPE:
self._store_send_event_level(txn, event)
elif event.type == RoomOpsPowerLevelsEvent.TYPE:
self._store_ops_level(txn, event)
elif event.type == RoomDeletionEvent.TYPE:
self._store_deletion(txn, event)
vals = {
"topological_ordering": event.depth,
"event_id": event.event_id,
"type": event.type,
"room_id": event.room_id,
"content": json.dumps(event.content),
"processed": True,
}
if stream_ordering is not None:
vals["stream_ordering"] = stream_ordering
if hasattr(event, "outlier"):
vals["outlier"] = event.outlier
else:
vals["outlier"] = False
unrec = {
k: v
for k, v in event.get_full_dict().items()
if k not in vals.keys() and k not in ["deleted", "pruned_because"]
}
vals["unrecognized_keys"] = json.dumps(unrec)
try:
self._simple_insert_txn(txn, "events", vals)
except:
logger.warn(
"Failed to persist, probably duplicate: %s",
event.event_id,
exc_info=True,
)
raise _RollbackButIsFineException("_persist_event")
if is_new_state and hasattr(event, "state_key"):
vals = {
"event_id": event.event_id,
"room_id": event.room_id,
"type": event.type,
"state_key": event.state_key,
}
if hasattr(event, "prev_state"):
vals["prev_state"] = event.prev_state
self._simple_insert_txn(txn, "state_events", vals)
self._simple_insert_txn(
txn,
"current_state_events",
{
"event_id": event.event_id,
"room_id": event.room_id,
"type": event.type,
"state_key": event.state_key,
}
)
def _store_deletion(self, txn, event):
event_id = event.event_id
deletes = event.deletes
# We check if this new delete deletes an old delete or has been
# deleted by a previous delete that we received out of order.
sql = "SELECT * FROM deletions WHERE event_id = ? OR deletes = ?"
txn.execute(sql, (deletes, event_id))
if txn.fetchall():
sql = "DELETE FROM deletions WHERE event_id = ? OR deletes = ?"
txn.execute(sql, (deletes, event_id, ))
else:
sql = "INSERT INTO deletions (event_id, deletes) VALUES (?,?)"
txn.execute(sql, (event_id, deletes))
@defer.inlineCallbacks
def get_current_state(self, room_id, event_type=None, state_key=""):
sql = (
"SELECT e.*, (%(deleted)s) AS deleted FROM events as e "
"INNER JOIN current_state_events as c ON e.event_id = c.event_id "
"INNER JOIN state_events as s ON e.event_id = s.event_id "
"WHERE c.room_id = ? "
) % {
"deleted": "e.event_id IN (SELECT deletes FROM deletions)",
}
if event_type:
sql += " AND s.type = ? AND s.state_key = ? "
args = (room_id, event_type, state_key)
else:
args = (room_id, )
results = yield self._execute_and_decode(sql, *args)
events = yield self._parse_events(results)
defer.returnValue(events)
@defer.inlineCallbacks
def _get_min_token(self):
row = yield self._execute(
None,
"SELECT MIN(stream_ordering) FROM events"
)
self.min_token = row[0][0] if row and row[0] and row[0][0] else -1
self.min_token = min(self.min_token, -1)
logger.debug("min_token is: %s", self.min_token)
defer.returnValue(self.min_token)
def snapshot_room(self, room_id, user_id, state_type=None, state_key=None):
"""Snapshot the room for an update by a user
Args:
room_id (synapse.types.RoomId): The room to snapshot.
user_id (synapse.types.UserId): The user to snapshot the room for.
state_type (str): Optional state type to snapshot.
state_key (str): Optional state key to snapshot.
Returns:
synapse.storage.Snapshot: A snapshot of the state of the room.
"""
def _snapshot(txn):
membership_state = self._get_room_member(txn, user_id, room_id)
prev_pdus = self._get_latest_pdus_in_context(
txn, room_id
)
if state_type is not None and state_key is not None:
prev_state_pdu = self._get_current_state_pdu(
txn, room_id, state_type, state_key
)
else:
prev_state_pdu = None
return Snapshot(
store=self,
room_id=room_id,
user_id=user_id,
prev_pdus=prev_pdus,
membership_state=membership_state,
state_type=state_type,
state_key=state_key,
prev_state_pdu=prev_state_pdu,
)
return self.runInteraction(_snapshot)
class Snapshot(object):
"""Snapshot of the state of a room
Args:
store (DataStore): The datastore.
room_id (RoomId): The room of the snapshot.
user_id (UserId): The user this snapshot is for.
prev_pdus (list): The list of PDU ids this snapshot is after.
membership_state (RoomMemberEvent): The current state of the user in
the room.
state_type (str, optional): State type captured by the snapshot
state_key (str, optional): State key captured by the snapshot
prev_state_pdu (PduEntry, optional): pdu id of
the previous value of the state type and key in the room.
"""
def __init__(self, store, room_id, user_id, prev_pdus,
membership_state, state_type=None, state_key=None,
prev_state_pdu=None):
self.store = store
self.room_id = room_id
self.user_id = user_id
self.prev_pdus = prev_pdus
self.membership_state = membership_state
self.state_type = state_type
self.state_key = state_key
self.prev_state_pdu = prev_state_pdu
def fill_out_prev_events(self, event):
if hasattr(event, "prev_events"):
return
es = [
"%s@%s" % (p_id, origin) for p_id, origin, _ in self.prev_pdus
]
event.prev_events = [e for e in es if e != event.event_id]
if self.prev_pdus:
event.depth = max([int(v) for _, _, v in self.prev_pdus]) + 1
else:
event.depth = 0
def schema_path(schema):
""" Get a filesystem path for the named database schema
Args:
schema: Name of the database schema.
Returns:
A filesystem path pointing at a ".sql" file.
"""
dir_path = os.path.dirname(__file__)
schemaPath = os.path.join(dir_path, "schema", schema + ".sql")
return schemaPath
def read_schema(schema):
""" Read the named database schema.
Args:
schema: Name of the datbase schema.
Returns:
A string containing the database schema.
"""
with open(schema_path(schema)) as schema_file:
return schema_file.read()
def prepare_database(db_conn):
""" Set up all the dbs. Since all the *.sql have IF NOT EXISTS, so we
don't have to worry about overwriting existing content.
"""
c = db_conn.cursor()
c.execute("PRAGMA user_version")
row = c.fetchone()
if row and row[0]:
user_version = row[0]
if user_version > SCHEMA_VERSION:
raise ValueError("Cannot use this database as it is too " +
"new for the server to understand"
)
elif user_version < SCHEMA_VERSION:
logging.info("Upgrading database from version %d",
user_version
)
# Run every version since after the current version.
for v in range(user_version + 1, SCHEMA_VERSION + 1):
sql_script = read_schema("delta/v%d" % (v))
c.executescript(sql_script)
db_conn.commit()
else:
for sql_loc in SCHEMAS:
sql_script = read_schema(sql_loc)
c.executescript(sql_script)
db_conn.commit()
c.execute("PRAGMA user_version = %d" % SCHEMA_VERSION)
c.close()