forked-synapse/synapse/storage/receipts.py
Matthew Hodgson 6c28ac260c copyrights
2016-01-07 04:26:29 +00:00

407 lines
13 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2014-2016 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.
from ._base import SQLBaseStore
from synapse.util.caches.descriptors import cachedInlineCallbacks, cachedList
from synapse.util.caches import cache_counter, caches_by_name
from twisted.internet import defer
from blist import sorteddict
import logging
import ujson as json
logger = logging.getLogger(__name__)
class ReceiptsStore(SQLBaseStore):
def __init__(self, hs):
super(ReceiptsStore, self).__init__(hs)
self._receipts_stream_cache = _RoomStreamChangeCache()
@defer.inlineCallbacks
def get_linearized_receipts_for_rooms(self, room_ids, to_key, from_key=None):
"""Get receipts for multiple rooms for sending to clients.
Args:
room_ids (list): List of room_ids.
to_key (int): Max stream id to fetch receipts upto.
from_key (int): Min stream id to fetch receipts from. None fetches
from the start.
Returns:
list: A list of receipts.
"""
room_ids = set(room_ids)
if from_key:
room_ids = yield self._receipts_stream_cache.get_rooms_changed(
self, room_ids, from_key
)
results = yield self._get_linearized_receipts_for_rooms(
room_ids, to_key, from_key=from_key
)
defer.returnValue([ev for res in results.values() for ev in res])
@cachedInlineCallbacks(num_args=3, max_entries=5000)
def get_linearized_receipts_for_room(self, room_id, to_key, from_key=None):
"""Get receipts for a single room for sending to clients.
Args:
room_ids (str): The room id.
to_key (int): Max stream id to fetch receipts upto.
from_key (int): Min stream id to fetch receipts from. None fetches
from the start.
Returns:
list: A list of receipts.
"""
def f(txn):
if from_key:
sql = (
"SELECT * FROM receipts_linearized WHERE"
" room_id = ? AND stream_id > ? AND stream_id <= ?"
)
txn.execute(
sql,
(room_id, from_key, to_key)
)
else:
sql = (
"SELECT * FROM receipts_linearized WHERE"
" room_id = ? AND stream_id <= ?"
)
txn.execute(
sql,
(room_id, to_key)
)
rows = self.cursor_to_dict(txn)
return rows
rows = yield self.runInteraction(
"get_linearized_receipts_for_room", f
)
if not rows:
defer.returnValue([])
content = {}
for row in rows:
content.setdefault(
row["event_id"], {}
).setdefault(
row["receipt_type"], {}
)[row["user_id"]] = json.loads(row["data"])
defer.returnValue([{
"type": "m.receipt",
"room_id": room_id,
"content": content,
}])
@cachedList(cache=get_linearized_receipts_for_room.cache, list_name="room_ids",
num_args=3, inlineCallbacks=True)
def _get_linearized_receipts_for_rooms(self, room_ids, to_key, from_key=None):
if not room_ids:
defer.returnValue({})
def f(txn):
if from_key:
sql = (
"SELECT * FROM receipts_linearized WHERE"
" room_id IN (%s) AND stream_id > ? AND stream_id <= ?"
) % (
",".join(["?"] * len(room_ids))
)
args = list(room_ids)
args.extend([from_key, to_key])
txn.execute(sql, args)
else:
sql = (
"SELECT * FROM receipts_linearized WHERE"
" room_id IN (%s) AND stream_id <= ?"
) % (
",".join(["?"] * len(room_ids))
)
args = list(room_ids)
args.append(to_key)
txn.execute(sql, args)
return self.cursor_to_dict(txn)
txn_results = yield self.runInteraction(
"_get_linearized_receipts_for_rooms", f
)
results = {}
for row in txn_results:
# We want a single event per room, since we want to batch the
# receipts by room, event and type.
room_event = results.setdefault(row["room_id"], {
"type": "m.receipt",
"room_id": row["room_id"],
"content": {},
})
# The content is of the form:
# {"$foo:bar": { "read": { "@user:host": <receipt> }, .. }, .. }
event_entry = room_event["content"].setdefault(row["event_id"], {})
receipt_type = event_entry.setdefault(row["receipt_type"], {})
receipt_type[row["user_id"]] = json.loads(row["data"])
results = {
room_id: [results[room_id]] if room_id in results else []
for room_id in room_ids
}
defer.returnValue(results)
def get_max_receipt_stream_id(self):
return self._receipts_id_gen.get_max_token(self)
@cachedInlineCallbacks()
def get_graph_receipts_for_room(self, room_id):
"""Get receipts for sending to remote servers.
"""
rows = yield self._simple_select_list(
table="receipts_graph",
keyvalues={"room_id": room_id},
retcols=["receipt_type", "user_id", "event_id"],
desc="get_linearized_receipts_for_room",
)
result = {}
for row in rows:
result.setdefault(
row["user_id"], {}
).setdefault(
row["receipt_type"], []
).append(row["event_id"])
defer.returnValue(result)
def insert_linearized_receipt_txn(self, txn, room_id, receipt_type,
user_id, event_id, data, stream_id):
# We don't want to clobber receipts for more recent events, so we
# have to compare orderings of existing receipts
sql = (
"SELECT topological_ordering, stream_ordering, event_id FROM events"
" INNER JOIN receipts_linearized as r USING (event_id, room_id)"
" WHERE r.room_id = ? AND r.receipt_type = ? AND r.user_id = ?"
)
txn.execute(sql, (room_id, receipt_type, user_id))
results = txn.fetchall()
if results:
res = self._simple_select_one_txn(
txn,
table="events",
retcols=["topological_ordering", "stream_ordering"],
keyvalues={"event_id": event_id},
)
topological_ordering = int(res["topological_ordering"])
stream_ordering = int(res["stream_ordering"])
for to, so, _ in results:
if int(to) > topological_ordering:
return False
elif int(to) == topological_ordering and int(so) >= stream_ordering:
return False
self._simple_delete_txn(
txn,
table="receipts_linearized",
keyvalues={
"room_id": room_id,
"receipt_type": receipt_type,
"user_id": user_id,
}
)
self._simple_insert_txn(
txn,
table="receipts_linearized",
values={
"stream_id": stream_id,
"room_id": room_id,
"receipt_type": receipt_type,
"user_id": user_id,
"event_id": event_id,
"data": json.dumps(data),
}
)
return True
@defer.inlineCallbacks
def insert_receipt(self, room_id, receipt_type, user_id, event_ids, data):
"""Insert a receipt, either from local client or remote server.
Automatically does conversion between linearized and graph
representations.
"""
if not event_ids:
return
if len(event_ids) == 1:
linearized_event_id = event_ids[0]
else:
# we need to points in graph -> linearized form.
# TODO: Make this better.
def graph_to_linear(txn):
query = (
"SELECT event_id WHERE room_id = ? AND stream_ordering IN ("
" SELECT max(stream_ordering) WHERE event_id IN (%s)"
")"
) % (",".join(["?"] * len(event_ids)))
txn.execute(query, [room_id] + event_ids)
rows = txn.fetchall()
if rows:
return rows[0][0]
else:
raise RuntimeError("Unrecognized event_ids: %r" % (event_ids,))
linearized_event_id = yield self.runInteraction(
"insert_receipt_conv", graph_to_linear
)
stream_id_manager = yield self._receipts_id_gen.get_next(self)
with stream_id_manager as stream_id:
yield self._receipts_stream_cache.room_has_changed(
self, room_id, stream_id
)
have_persisted = yield self.runInteraction(
"insert_linearized_receipt",
self.insert_linearized_receipt_txn,
room_id, receipt_type, user_id, linearized_event_id,
data,
stream_id=stream_id,
)
if not have_persisted:
defer.returnValue(None)
yield self.insert_graph_receipt(
room_id, receipt_type, user_id, event_ids, data
)
max_persisted_id = yield self._stream_id_gen.get_max_token(self)
defer.returnValue((stream_id, max_persisted_id))
def insert_graph_receipt(self, room_id, receipt_type, user_id, event_ids,
data):
return self.runInteraction(
"insert_graph_receipt",
self.insert_graph_receipt_txn,
room_id, receipt_type, user_id, event_ids, data
)
def insert_graph_receipt_txn(self, txn, room_id, receipt_type,
user_id, event_ids, data):
self._simple_delete_txn(
txn,
table="receipts_graph",
keyvalues={
"room_id": room_id,
"receipt_type": receipt_type,
"user_id": user_id,
}
)
self._simple_insert_txn(
txn,
table="receipts_graph",
values={
"room_id": room_id,
"receipt_type": receipt_type,
"user_id": user_id,
"event_ids": json.dumps(event_ids),
"data": json.dumps(data),
}
)
class _RoomStreamChangeCache(object):
"""Keeps track of the stream_id of the latest change in rooms.
Given a list of rooms and stream key, it will give a subset of rooms that
may have changed since that key. If the key is too old then the cache
will simply return all rooms.
"""
def __init__(self, size_of_cache=10000):
self._size_of_cache = size_of_cache
self._room_to_key = {}
self._cache = sorteddict()
self._earliest_key = None
self.name = "ReceiptsRoomChangeCache"
caches_by_name[self.name] = self._cache
@defer.inlineCallbacks
def get_rooms_changed(self, store, room_ids, key):
"""Returns subset of room ids that have had new receipts since the
given key. If the key is too old it will just return the given list.
"""
if key > (yield self._get_earliest_key(store)):
keys = self._cache.keys()
i = keys.bisect_right(key)
result = set(
self._cache[k] for k in keys[i:]
).intersection(room_ids)
cache_counter.inc_hits(self.name)
else:
result = room_ids
cache_counter.inc_misses(self.name)
defer.returnValue(result)
@defer.inlineCallbacks
def room_has_changed(self, store, room_id, key):
"""Informs the cache that the room has been changed at the given key.
"""
if key > (yield self._get_earliest_key(store)):
old_key = self._room_to_key.get(room_id, None)
if old_key:
key = max(key, old_key)
self._cache.pop(old_key, None)
self._cache[key] = room_id
while len(self._cache) > self._size_of_cache:
k, r = self._cache.popitem()
self._earliest_key = max(k, self._earliest_key)
self._room_to_key.pop(r, None)
@defer.inlineCallbacks
def _get_earliest_key(self, store):
if self._earliest_key is None:
self._earliest_key = yield store.get_max_receipt_stream_id()
self._earliest_key = int(self._earliest_key)
defer.returnValue(self._earliest_key)