MatrixSynapse/synapse/storage/roommember.py

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# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 OpenMarket Ltd
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#
# 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.
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from twisted.internet import defer
from collections import namedtuple
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from ._base import SQLBaseStore
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from synapse.api.constants import Membership
from synapse.types import UserID
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import logging
logger = logging.getLogger(__name__)
RoomsForUser = namedtuple(
"RoomsForUser",
("room_id", "sender", "membership")
)
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class RoomMemberStore(SQLBaseStore):
def __init__(self, *args, **kw):
super(RoomMemberStore, self).__init__(*args, **kw)
self._user_rooms_cache = {}
def _store_room_member_txn(self, txn, event):
"""Store a room member in the database.
"""
try:
target_user_id = event.state_key
domain = UserID.from_string(target_user_id).domain
except:
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logger.exception(
"Failed to parse target_user_id=%s", target_user_id
)
raise
logger.debug(
"_store_room_member_txn: target_user_id=%s, membership=%s",
target_user_id,
event.membership,
)
self._simple_insert_txn(
txn,
"room_memberships",
{
"event_id": event.event_id,
"user_id": target_user_id,
"sender": event.user_id,
"room_id": event.room_id,
"membership": event.membership,
}
)
# Update room hosts table
if event.membership == Membership.JOIN:
sql = (
"INSERT OR IGNORE INTO room_hosts (room_id, host) "
"VALUES (?, ?)"
)
txn.execute(sql, (event.room_id, domain))
elif event.membership != Membership.INVITE:
# Check if this was the last person to have left.
member_events = self._get_members_query_txn(
txn,
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where_clause=("c.room_id = ? AND m.membership = ?"
" AND m.user_id != ?"),
where_values=(event.room_id, Membership.JOIN, target_user_id,)
)
joined_domains = set()
for e in member_events:
try:
joined_domains.add(
UserID.from_string(e.state_key).domain
)
except:
# FIXME: How do we deal with invalid user ids in the db?
logger.exception("Invalid user_id: %s", event.state_key)
if domain not in joined_domains:
sql = (
"DELETE FROM room_hosts WHERE room_id = ? AND host = ?"
)
txn.execute(sql, (event.room_id, domain))
self.invalidate_rooms_for_user(target_user_id)
@defer.inlineCallbacks
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def get_room_member(self, user_id, room_id):
"""Retrieve the current state of a room member.
Args:
user_id (str): The member's user ID.
room_id (str): The room the member is in.
Returns:
Deferred: Results in a MembershipEvent or None.
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"""
rows = yield self._get_members_by_dict({
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"e.room_id": room_id,
"m.user_id": user_id,
})
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defer.returnValue(rows[0] if rows else None)
def _get_room_member(self, txn, user_id, room_id):
sql = (
"SELECT e.* FROM events as e"
" INNER JOIN room_memberships as m"
" ON e.event_id = m.event_id"
" INNER JOIN current_state_events as c"
" ON m.event_id = c.event_id"
" WHERE m.user_id = ? and e.room_id = ?"
" LIMIT 1"
)
txn.execute(sql, (user_id, room_id))
rows = self.cursor_to_dict(txn)
if rows:
return self._parse_events_txn(txn, rows)[0]
else:
return None
def get_users_in_room(self, room_id):
def f(txn):
sql = (
"SELECT m.user_id FROM room_memberships as m"
" INNER JOIN current_state_events as c"
" ON m.event_id = c.event_id"
" WHERE m.membership = ? AND m.room_id = ?"
)
txn.execute(sql, (Membership.JOIN, room_id))
return [r[0] for r in txn.fetchall()]
return self.runInteraction("get_users_in_room", f)
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def get_room_members(self, room_id, membership=None):
"""Retrieve the current room member list for a room.
Args:
room_id (str): The room to get the list of members.
membership (synapse.api.constants.Membership): The filter to apply
to this list, or None to return all members with some state
associated with this room.
Returns:
list of namedtuples representing the members in this room.
"""
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where = {"m.room_id": room_id}
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if membership:
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where["m.membership"] = membership
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return self._get_members_by_dict(where)
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def get_rooms_for_user_where_membership_is(self, user_id, membership_list):
""" Get all the rooms for this user where the membership for this user
matches one in the membership list.
Args:
user_id (str): The user ID.
membership_list (list): A list of synapse.api.constants.Membership
values which the user must be in.
Returns:
A list of dictionary objects, with room_id, membership and sender
defined.
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"""
if not membership_list:
return defer.succeed(None)
where_clause = "user_id = ? AND (%s)" % (
" OR ".join(["membership = ?" for _ in membership_list]),
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)
args = [user_id]
args.extend(membership_list)
def f(txn):
sql = (
"SELECT m.room_id, m.sender, m.membership"
" FROM room_memberships as m"
" INNER JOIN current_state_events as c"
" ON m.event_id = c.event_id"
" WHERE %s"
) % (where_clause,)
txn.execute(sql, args)
return [
RoomsForUser(**r) for r in self.cursor_to_dict(txn)
]
return self.runInteraction(
"get_rooms_for_user_where_membership_is",
f
)
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def get_joined_hosts_for_room(self, room_id):
return self._simple_select_onecol(
"room_hosts",
{"room_id": room_id},
"host"
)
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def _get_members_by_dict(self, where_dict):
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clause = " AND ".join("%s = ?" % k for k in where_dict.keys())
vals = where_dict.values()
return self._get_members_query(clause, vals)
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def _get_members_query(self, where_clause, where_values):
return self.runInteraction(
"get_members_query", self._get_members_query_txn,
where_clause, where_values
)
def _get_members_query_txn(self, txn, where_clause, where_values):
sql = (
"SELECT e.* FROM events as e "
"INNER JOIN room_memberships as m "
"ON e.event_id = m.event_id "
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"INNER JOIN current_state_events as c "
"ON m.event_id = c.event_id "
"WHERE %(where)s "
) % {
"where": where_clause,
}
txn.execute(sql, where_values)
rows = self.cursor_to_dict(txn)
results = self._parse_events_txn(txn, rows)
return results
# TODO(paul): Create a nice @cached decorator to do this
# @cached
# def get_foo(...)
# ...
# invalidate_foo = get_foo.invalidator
@defer.inlineCallbacks
def get_rooms_for_user(self, user_id):
# TODO(paul): put some performance counters in here so we can easily
# track what impact this cache is having
if user_id in self._user_rooms_cache:
defer.returnValue(self._user_rooms_cache[user_id])
rooms = yield self.get_rooms_for_user_where_membership_is(
user_id, membership_list=[Membership.JOIN],
)
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# TODO(paul): Consider applying a maximum size; just evict things at
# random, or consider LRU?
self._user_rooms_cache[user_id] = rooms
defer.returnValue(rooms)
def invalidate_rooms_for_user(self, user_id):
if user_id in self._user_rooms_cache:
del self._user_rooms_cache[user_id]
@defer.inlineCallbacks
def user_rooms_intersect(self, user_id_list):
""" Checks whether all the users whose IDs are given in a list share a
room.
This is a "hot path" function that's called a lot, e.g. by presence for
generating the event stream. As such, it is implemented locally by
wrapping logic around heavily-cached database queries.
"""
if len(user_id_list) < 2:
defer.returnValue(True)
deferreds = [self.get_rooms_for_user(u) for u in user_id_list]
results = yield defer.DeferredList(deferreds)
# A list of sets of strings giving room IDs for each user
room_id_lists = [set([r.room_id for r in result[1]]) for result in results]
# There isn't a setintersection(*list_of_sets)
ret = len(room_id_lists.pop(0).intersection(*room_id_lists)) > 0
defer.returnValue(ret)