# 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 logging
from typing import Any, Dict, List, Optional, Tuple
from twisted.internet import defer
from synapse.replication.slave.storage._slaved_id_tracker import SlavedIdTracker
from synapse.replication.tcp.streams import ReceiptsStream
from synapse.storage._base import SQLBaseStore, db_to_json, make_in_list_sql_clause
from synapse.storage.database import DatabasePool
from synapse.storage.engines import PostgresEngine
from synapse.storage.util.id_generators import MultiWriterIdGenerator, StreamIdGenerator
from synapse.types import JsonDict
from synapse.util import json_encoder
from synapse.util.caches.descriptors import cached, cachedList
from synapse.util.caches.stream_change_cache import StreamChangeCache
logger = logging.getLogger(__name__)
class ReceiptsWorkerStore(SQLBaseStore):
def __init__(self, database: DatabasePool, db_conn, hs):
self._instance_name = hs.get_instance_name()
if isinstance(database.engine, PostgresEngine):
self._can_write_to_receipts = (
self._instance_name in hs.config.worker.writers.receipts
)
self._receipts_id_gen = MultiWriterIdGenerator(
db_conn=db_conn,
db=database,
stream_name="receipts",
instance_name=self._instance_name,
tables=[("receipts_linearized", "instance_name", "stream_id")],
sequence_name="receipts_sequence",
writers=hs.config.worker.writers.receipts,
)
else:
self._can_write_to_receipts = True
# We shouldn't be running in worker mode with SQLite, but its useful
# to support it for unit tests.
#
# If this process is the writer than we need to use
# `StreamIdGenerator`, otherwise we use `SlavedIdTracker` which gets
# updated over replication. (Multiple writers are not supported for
# SQLite).
if hs.get_instance_name() in hs.config.worker.writers.receipts:
self._receipts_id_gen = StreamIdGenerator(
db_conn, "receipts_linearized", "stream_id"
)
else:
self._receipts_id_gen = SlavedIdTracker(
db_conn, "receipts_linearized", "stream_id"
)
super().__init__(database, db_conn, hs)
self._receipts_stream_cache = StreamChangeCache(
"ReceiptsRoomChangeCache", self.get_max_receipt_stream_id()
)
def get_max_receipt_stream_id(self):
"""Get the current max stream ID for receipts stream
Returns:
int
"""
return self._receipts_id_gen.get_current_token()
@cached()
async def get_users_with_read_receipts_in_room(self, room_id):
receipts = await self.get_receipts_for_room(room_id, "m.read")
return {r["user_id"] for r in receipts}
@cached(num_args=2)
async def get_receipts_for_room(
self, room_id: str, receipt_type: str
) -> List[Dict[str, Any]]:
return await self.db_pool.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)
async def get_last_receipt_event_id_for_user(
self, user_id: str, room_id: str, receipt_type: str
) -> Optional[str]:
return await self.db_pool.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,
)
@cached(num_args=2)
async def get_receipts_for_user(self, user_id, receipt_type):
rows = await self.db_pool.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",
)
return {row["room_id"]: row["event_id"] for row in rows}
async 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 = await self.db_pool.runInteraction(
"get_receipts_for_user_with_orderings", f
)
return {
row[0]: {
"event_id": row[1],
"topological_ordering": row[2],
"stream_ordering": row[3],
}
for row in rows
}
async def get_linearized_receipts_for_rooms(
self, room_ids: List[str], to_key: int, from_key: Optional[int] = None
) -> List[dict]:
"""Get receipts for multiple rooms for sending to clients.
Args:
room_id: List of room_ids.
to_key: Max stream id to fetch receipts up to.
from_key: Min stream id to fetch receipts from. None fetches
from the start.
Returns:
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 = self._receipts_stream_cache.get_entities_changed(
room_ids, from_key
)
results = await self._get_linearized_receipts_for_rooms(
room_ids, to_key, from_key=from_key
)
return [ev for res in results.values() for ev in res]
async def get_linearized_receipts_for_room(
self, room_id: str, to_key: int, from_key: Optional[int] = None
) -> List[dict]:
"""Get receipts for a single room for sending to clients.
Args:
room_ids: The room id.
to_key: Max stream id to fetch receipts up to.
from_key: Min stream id to fetch receipts from. None fetches
from the start.
Returns:
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):
return []
return await self._get_linearized_receipts_for_room(room_id, to_key, from_key)
@cached(num_args=3, tree=True)
async def _get_linearized_receipts_for_room(
self, room_id: str, to_key: int, from_key: Optional[int] = None
) -> List[dict]:
"""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.db_pool.cursor_to_dict(txn)
return rows
rows = await self.db_pool.runInteraction("get_linearized_receipts_for_room", f)
if not rows:
return []
content = {}
for row in rows:
content.setdefault(row["event_id"], {}).setdefault(row["receipt_type"], {})[
row["user_id"]
] = db_to_json(row["data"])
return [{"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,
)
async def _get_linearized_receipts_for_rooms(self, room_ids, to_key, from_key=None):
if not room_ids:
return {}
def f(txn):
if from_key:
sql = """
SELECT * FROM receipts_linearized WHERE
stream_id > ? AND stream_id <= ? AND
"""
clause, args = make_in_list_sql_clause(
self.database_engine, "room_id", room_ids
)
txn.execute(sql + clause, [from_key, to_key] + list(args))
else:
sql = """
SELECT * FROM receipts_linearized WHERE
stream_id <= ? AND
"""
clause, args = make_in_list_sql_clause(
self.database_engine, "room_id", room_ids
)
txn.execute(sql + clause, [to_key] + list(args))
return self.db_pool.cursor_to_dict(txn)
txn_results = await self.db_pool.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:
# {"$foo:bar": { "read": { "@user:host": <receipt> }, .. }, .. }
event_entry = room_event["content"].setdefault(row["event_id"], {})
receipt_type = event_entry.setdefault(row["receipt_type"], {})
receipt_type[row["user_id"]] = db_to_json(row["data"])
results = {
room_id: [results[room_id]] if room_id in results else []
for room_id in room_ids
}
return results
@cached(
num_args=2,
)
async def get_linearized_receipts_for_all_rooms(
self, to_key: int, from_key: Optional[int] = None
) -> Dict[str, JsonDict]:
"""Get receipts for all rooms between two stream_ids, up
to a limit of the latest 100 read receipts.
Args:
to_key: Max stream id to fetch receipts up to.
from_key: Min stream id to fetch receipts from. None fetches
from the start.
Returns:
A dictionary of roomids to a list of receipts.
"""
def f(txn):
if from_key:
sql = """
SELECT * FROM receipts_linearized WHERE
stream_id > ? AND stream_id <= ?
ORDER BY stream_id DESC
LIMIT 100
"""
txn.execute(sql, [from_key, to_key])
else:
sql = """
SELECT * FROM receipts_linearized WHERE
stream_id <= ?
ORDER BY stream_id DESC
LIMIT 100
"""
txn.execute(sql, [to_key])
return self.db_pool.cursor_to_dict(txn)
txn_results = await self.db_pool.runInteraction(
"get_linearized_receipts_for_all_rooms", f
)
results = {}
for row in txn_results:
# We want a single event per room, since we want to batch the
# receipts by room, event and type.
room_event = results.setdefault(
row["room_id"],
{"type": "m.receipt", "room_id": row["room_id"], "content": {}},
)
# The content is of the form:
# {"$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"]] = db_to_json(row["data"])
return results
async def get_users_sent_receipts_between(
self, last_id: int, current_id: int
) -> List[str]:
"""Get all users who sent receipts between `last_id` exclusive and
`current_id` inclusive.
Returns:
The list of users.
"""
if last_id == current_id:
return defer.succeed([])
def _get_users_sent_receipts_between_txn(txn):
sql = """
SELECT DISTINCT user_id FROM receipts_linearized
WHERE ? < stream_id AND stream_id <= ?
"""
txn.execute(sql, (last_id, current_id))
return [r[0] for r in txn]
return await self.db_pool.runInteraction(
"get_users_sent_receipts_between", _get_users_sent_receipts_between_txn
)
async def get_all_updated_receipts(
self, instance_name: str, last_id: int, current_id: int, limit: int
) -> Tuple[List[Tuple[int, list]], int, bool]:
"""Get updates for receipts replication stream.
Args:
instance_name: The writer we want to fetch updates from. Unused
here since there is only ever one writer.
last_id: The token to fetch updates from. Exclusive.
current_id: The token to fetch updates up to. Inclusive.
limit: The requested limit for the number of rows to return. The
function may return more or fewer rows.
Returns:
A tuple consisting of: the updates, a token to use to fetch
subsequent updates, and whether we returned fewer rows than exists
between the requested tokens due to the limit.
The token returned can be used in a subsequent call to this
function to get further updatees.
The updates are a list of 2-tuples of stream ID and the row data
"""
if last_id == current_id:
return [], current_id, False
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
LIMIT ?
"""
txn.execute(sql, (last_id, current_id, limit))
updates = [(r[0], r[1:5] + (db_to_json(r[5]),)) for r in txn]
limited = False
upper_bound = current_id
if len(updates) == limit:
limited = True
upper_bound = updates[-1][0]
return updates, upper_bound, limited
return await self.db_pool.runInteraction(
"get_all_updated_receipts", get_all_updated_receipts_txn
)
def _invalidate_get_users_with_receipts_in_room(
self, room_id: str, receipt_type: str, user_id: str
):
if receipt_type != "m.read":
return
res = self.get_users_with_read_receipts_in_room.cache.get_immediate(
room_id, None, update_metrics=False
)
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,))
def invalidate_caches_for_receipt(self, room_id, receipt_type, user_id):
self.get_receipts_for_user.invalidate((user_id, receipt_type))
self._get_linearized_receipts_for_room.invalidate((room_id,))
self.get_last_receipt_event_id_for_user.invalidate(
(user_id, room_id, receipt_type)
)
self._invalidate_get_users_with_receipts_in_room(room_id, receipt_type, user_id)
self.get_receipts_for_room.invalidate((room_id, receipt_type))
def process_replication_rows(self, stream_name, instance_name, token, rows):
if stream_name == ReceiptsStream.NAME:
self._receipts_id_gen.advance(instance_name, token)
for row in rows:
self.invalidate_caches_for_receipt(
row.room_id, row.receipt_type, row.user_id
)
self._receipts_stream_cache.entity_has_changed(row.room_id, token)
return super().process_replication_rows(stream_name, instance_name, token, rows)
def insert_linearized_receipt_txn(
self, txn, room_id, receipt_type, user_id, event_id, data, stream_id
):
"""Inserts a read-receipt into the database if it's newer than the current RR
Returns: int|None
None if the RR is older than the current RR
otherwise, the rx timestamp of the event that the RR corresponds to
(or 0 if the event is unknown)
"""
assert self._can_write_to_receipts
res = self.db_pool.simple_select_one_txn(
txn,
table="events",
retcols=["stream_ordering", "received_ts"],
keyvalues={"event_id": event_id},
allow_none=True,
)
stream_ordering = int(res["stream_ordering"]) if res else None
rx_ts = res["received_ts"] if res else 0
# 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 None
txn.call_after(
self.invalidate_caches_for_receipt, room_id, receipt_type, user_id
)
txn.call_after(
self._receipts_stream_cache.entity_has_changed, room_id, stream_id
)
self.db_pool.simple_upsert_txn(
txn,
table="receipts_linearized",
keyvalues={
"room_id": room_id,
"receipt_type": receipt_type,
"user_id": user_id,
},
values={
"stream_id": stream_id,
"event_id": event_id,
"data": json_encoder.encode(data),
},
# receipts_linearized has a unique constraint on
# (user_id, room_id, receipt_type), so no need to lock
lock=False,
)
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 rx_ts
async def insert_receipt(
self,
room_id: str,
receipt_type: str,
user_id: str,
event_ids: List[str],
data: dict,
) -> Optional[Tuple[int, int]]:
"""Insert a receipt, either from local client or remote server.
Automatically does conversion between linearized and graph
representations.
"""
assert self._can_write_to_receipts
if not event_ids:
return None
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):
clause, args = make_in_list_sql_clause(
self.database_engine, "event_id", event_ids
)
sql = """
SELECT event_id WHERE room_id = ? AND stream_ordering IN (
SELECT max(stream_ordering) WHERE %s
)
""" % (
clause,
)
txn.execute(sql, [room_id] + list(args))
rows = txn.fetchall()
if rows:
return rows[0][0]
else:
raise RuntimeError("Unrecognized event_ids: %r" % (event_ids,))
linearized_event_id = await self.db_pool.runInteraction(
"insert_receipt_conv", graph_to_linear
)
async with self._receipts_id_gen.get_next() as stream_id:
event_ts = await self.db_pool.runInteraction(
"insert_linearized_receipt",
self.insert_linearized_receipt_txn,
room_id,
receipt_type,
user_id,
linearized_event_id,
data,
stream_id=stream_id,
)
if event_ts is None:
return None
now = self._clock.time_msec()
logger.debug(
"RR for event %s in %s (%i ms old)",
linearized_event_id,
room_id,
now - event_ts,
)
await self.insert_graph_receipt(room_id, receipt_type, user_id, event_ids, data)
max_persisted_id = self._receipts_id_gen.get_current_token()
return stream_id, max_persisted_id
async def insert_graph_receipt(
self, room_id, receipt_type, user_id, event_ids, data
):
assert self._can_write_to_receipts
return await self.db_pool.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
):
assert self._can_write_to_receipts
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, (room_id,))
self.db_pool.simple_delete_txn(
txn,
table="receipts_graph",
keyvalues={
"room_id": room_id,
"receipt_type": receipt_type,
"user_id": user_id,
},
)
self.db_pool.simple_insert_txn(
txn,
table="receipts_graph",
values={
"room_id": room_id,
"receipt_type": receipt_type,
"user_id": user_id,
"event_ids": json_encoder.encode(event_ids),
"data": json_encoder.encode(data),
},
)
class ReceiptsStore(ReceiptsWorkerStore):
pass