# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2018 New Vector 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 abc
import logging
from canonicaljson import json
from twisted.internet import defer
from synapse.util.caches.descriptors import cached, cachedInlineCallbacks, cachedList
from synapse.util.caches.stream_change_cache import StreamChangeCache
from ._base import SQLBaseStore
from .util.id_generators import StreamIdGenerator
logger = logging.getLogger(__name__)
class ReceiptsWorkerStore(SQLBaseStore):
"""This is an abstract base class where subclasses must implement
`get_max_receipt_stream_id` which can be called in the initializer.
"""
# This ABCMeta metaclass ensures that we cannot be instantiated without
# the abstract methods being implemented.
__metaclass__ = abc.ABCMeta
def __init__(self, db_conn, hs):
super(ReceiptsWorkerStore, self).__init__(db_conn, hs)
self._receipts_stream_cache = StreamChangeCache(
"ReceiptsRoomChangeCache", self.get_max_receipt_stream_id()
)
@abc.abstractmethod
def get_max_receipt_stream_id(self):
"""Get the current max stream ID for receipts stream
Returns:
int
"""
raise NotImplementedError()
@cachedInlineCallbacks()
def get_users_with_read_receipts_in_room(self, room_id):
receipts = yield self.get_receipts_for_room(room_id, "m.read")
defer.returnValue(set(r['user_id'] for r in receipts))
@cached(num_args=2)
def get_receipts_for_room(self, room_id, receipt_type):
return self._simple_select_list(
table="receipts_linearized",
keyvalues={
"room_id": room_id,
"receipt_type": receipt_type,
},
retcols=("user_id", "event_id"),
desc="get_receipts_for_room",
)
@cached(num_args=3)
def get_last_receipt_event_id_for_user(self, user_id, room_id, receipt_type):
return self._simple_select_one_onecol(
table="receipts_linearized",
keyvalues={
"room_id": room_id,
"receipt_type": receipt_type,
"user_id": user_id
},
retcol="event_id",
desc="get_own_receipt_for_user",
allow_none=True,
)
@cachedInlineCallbacks(num_args=2)
def get_receipts_for_user(self, user_id, receipt_type):
rows = yield self._simple_select_list(
table="receipts_linearized",
keyvalues={
"user_id": user_id,
"receipt_type": receipt_type,
},
retcols=("room_id", "event_id"),
desc="get_receipts_for_user",
)
defer.returnValue({row["room_id"]: row["event_id"] for row in rows})
@defer.inlineCallbacks
def get_receipts_for_user_with_orderings(self, user_id, receipt_type):
def f(txn):
sql = (
"SELECT rl.room_id, rl.event_id,"
" e.topological_ordering, e.stream_ordering"
" FROM receipts_linearized AS rl"
" INNER JOIN events AS e USING (room_id, event_id)"
" WHERE rl.room_id = e.room_id"
" AND rl.event_id = e.event_id"
" AND user_id = ?"
)
txn.execute(sql, (user_id,))
return txn.fetchall()
rows = yield self.runInteraction(
"get_receipts_for_user_with_orderings", f
)
defer.returnValue({
row[0]: {
"event_id": row[1],
"topological_ordering": row[2],
"stream_ordering": row[3],
} for row in rows
})
@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 is not None:
# Only ask the database about rooms where there have been new
# receipts added since `from_key`
room_ids = yield self._receipts_stream_cache.get_entities_changed(
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])
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:
Deferred[list]: A list of receipts.
"""
if from_key is not None:
# Check the cache first to see if any new receipts have been added
# since`from_key`. If not we can no-op.
if not self._receipts_stream_cache.has_entity_changed(room_id, from_key):
defer.succeed([])
return self._get_linearized_receipts_for_room(room_id, to_key, from_key)
@cachedInlineCallbacks(num_args=3, tree=True)
def _get_linearized_receipts_for_room(self, room_id, to_key, from_key=None):
"""See get_linearized_receipts_for_room
"""
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(cached_method_name="_get_linearized_receipts_for_room",
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_all_updated_receipts(self, last_id, current_id, limit=None):
if last_id == current_id:
return defer.succeed([])
def get_all_updated_receipts_txn(txn):
sql = (
"SELECT stream_id, room_id, receipt_type, user_id, event_id, data"
" FROM receipts_linearized"
" WHERE ? < stream_id AND stream_id <= ?"
" ORDER BY stream_id ASC"
)
args = [last_id, current_id]
if limit is not None:
sql += " LIMIT ?"
args.append(limit)
txn.execute(sql, args)
return txn.fetchall()
return self.runInteraction(
"get_all_updated_receipts", get_all_updated_receipts_txn
)
def _invalidate_get_users_with_receipts_in_room(self, room_id, receipt_type,
user_id):
if receipt_type != "m.read":
return
# Returns either an ObservableDeferred or the raw result
res = self.get_users_with_read_receipts_in_room.cache.get(
room_id, None, update_metrics=False,
)
# first handle the Deferred case
if isinstance(res, defer.Deferred):
if res.called:
res = res.result
else:
res = None
if res and user_id in res:
# We'd only be adding to the set, so no point invalidating if the
# user is already there
return
self.get_users_with_read_receipts_in_room.invalidate((room_id,))
class ReceiptsStore(ReceiptsWorkerStore):
def __init__(self, db_conn, hs):
# We instantiate this first as the ReceiptsWorkerStore constructor
# needs to be able to call get_max_receipt_stream_id
self._receipts_id_gen = StreamIdGenerator(
db_conn, "receipts_linearized", "stream_id"
)
super(ReceiptsStore, self).__init__(db_conn, hs)
def get_max_receipt_stream_id(self):
return self._receipts_id_gen.get_current_token()
def insert_linearized_receipt_txn(self, txn, room_id, receipt_type,
user_id, event_id, data, stream_id):
res = self._simple_select_one_txn(
txn,
table="events",
retcols=["topological_ordering", "stream_ordering"],
keyvalues={"event_id": event_id},
allow_none=True
)
stream_ordering = int(res["stream_ordering"]) if res else None
# We don't want to clobber receipts for more recent events, so we
# have to compare orderings of existing receipts
if stream_ordering is not None:
sql = (
"SELECT 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))
for so, eid in txn:
if int(so) >= stream_ordering:
logger.debug(
"Ignoring new receipt for %s in favour of existing "
"one for later event %s",
event_id, eid,
)
return False
txn.call_after(
self.get_receipts_for_room.invalidate, (room_id, receipt_type)
)
txn.call_after(
self._invalidate_get_users_with_receipts_in_room,
room_id, receipt_type, user_id,
)
txn.call_after(
self.get_receipts_for_user.invalidate, (user_id, receipt_type)
)
# FIXME: This shouldn't invalidate the whole cache
txn.call_after(self._get_linearized_receipts_for_room.invalidate_many, (room_id,))
txn.call_after(
self._receipts_stream_cache.entity_has_changed,
room_id, stream_id
)
txn.call_after(
self.get_last_receipt_event_id_for_user.invalidate,
(user_id, room_id, receipt_type)
)
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),
}
)
if receipt_type == "m.read" and stream_ordering is not None:
self._remove_old_push_actions_before_txn(
txn,
room_id=room_id,
user_id=user_id,
stream_ordering=stream_ordering,
)
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 = self._receipts_id_gen.get_next()
with stream_id_manager as 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 = self._receipts_id_gen.get_current_token()
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):
txn.call_after(
self.get_receipts_for_room.invalidate, (room_id, receipt_type)
)
txn.call_after(
self._invalidate_get_users_with_receipts_in_room,
room_id, receipt_type, user_id,
)
txn.call_after(
self.get_receipts_for_user.invalidate, (user_id, receipt_type)
)
# FIXME: This shouldn't invalidate the whole cache
txn.call_after(self._get_linearized_receipts_for_room.invalidate_many, (room_id,))
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),
}
)