Allow room initialSync for users that have left the room, returning a snapshot of how the room was when they left it

This commit is contained in:
Mark Haines 2015-09-09 13:25:22 +01:00
parent dd42bb78d0
commit 89ae0166de
3 changed files with 140 additions and 9 deletions

View file

@ -104,6 +104,20 @@ class Auth(object):
@defer.inlineCallbacks
def check_joined_room(self, room_id, user_id, current_state=None):
"""Check if the user is currently joined in the room
Args:
room_id(str): The room to check.
user_id(str): The user to check.
current_state(dict): Optional map of the current state of the room.
If provided then that map is used to check whether they are a
member of the room. Otherwise the current membership is
loaded from the database.
Raises:
AuthError if the user is not in the room.
Returns:
A deferred membership event for the user if the user is in
the room.
"""
if current_state:
member = current_state.get(
(EventTypes.Member, user_id),
@ -119,6 +133,41 @@ class Auth(object):
self._check_joined_room(member, user_id, room_id)
defer.returnValue(member)
@defer.inlineCallbacks
def check_user_was_in_room(self, room_id, user_id, current_state=None):
"""Check if the user was in the room at some point.
Args:
room_id(str): The room to check.
user_id(str): The user to check.
current_state(dict): Optional map of the current state of the room.
If provided then that map is used to check whether they are a
member of the room. Otherwise the current membership is
loaded from the database.
Raises:
AuthError if the user was never in the room.
Returns:
A deferred membership event for the user if the user was in
the room.
"""
if current_state:
member = current_state.get(
(EventTypes.Member, user_id),
None
)
else:
member = yield self.state.get_current_state(
room_id=room_id,
event_type=EventTypes.Member,
state_key=user_id
)
if not member:
raise AuthError(403, "User %s not in room %s" % (
user_id, room_id
))
defer.returnValue(member)
@defer.inlineCallbacks
def check_host_in_room(self, room_id, host):
curr_state = yield self.state.get_current_state(room_id)

View file

@ -22,7 +22,7 @@ from synapse.events.utils import serialize_event
from synapse.events.validator import EventValidator
from synapse.util import unwrapFirstError
from synapse.util.logcontext import PreserveLoggingContext
from synapse.types import UserID, RoomStreamToken
from synapse.types import UserID, RoomStreamToken, StreamToken
from ._base import BaseHandler
@ -377,7 +377,6 @@ class MessageHandler(BaseHandler):
lambda states: states[event.event_id]
)
(messages, token), current_state = yield defer.gatherResults(
[
self.store.get_recent_events_for_room(
@ -434,13 +433,83 @@ class MessageHandler(BaseHandler):
@defer.inlineCallbacks
def room_initial_sync(self, user_id, room_id, pagin_config=None,
feedback=False):
current_state = yield self.state.get_current_state(
room_id=room_id,
"""Capture the a snapshot of a room. If user is currently a member of
the room this will be what is currently in the room. If the user left
the room this will be what was in the room when they left.
Args:
user_id(str): The user to get a snapshot for.
room_id(str): The room to get a snapshot of.
pagin_config(synapse.api.streams.PaginationConfig): The pagination
config used to determine how many messages to return.
Raises:
AuthError if the user wasn't in the room.
Returns:
A JSON object with the snapshot of the room.
"""
member_event = yield self.auth.check_user_was_in_room(room_id, user_id)
if member_event.membership == Membership.JOIN:
result = yield self._room_initial_sync_joined(
user_id, room_id, pagin_config, member_event
)
elif member_event.membership == Membership.LEAVE:
result = yield self._room_initial_sync_parted(
user_id, room_id, pagin_config, member_event
)
defer.returnValue(result)
@defer.inlineCallbacks
def _room_initial_sync_parted(self, user_id, room_id, pagin_config,
member_event):
room_state = yield self.store.get_state_for_events(
member_event.room_id, [member_event.event_id], None
)
yield self.auth.check_joined_room(
room_id, user_id,
current_state=current_state
room_state = room_state[member_event.event_id]
limit = pagin_config.limit if pagin_config else None
if limit is None:
limit = 10
stream_token = yield self.store.get_stream_token_for_event(
member_event.event_id
)
messages, token = yield self.store.get_recent_events_for_room(
room_id,
limit=limit,
end_token=stream_token
)
messages = yield self._filter_events_for_client(
user_id, room_id, messages
)
start_token = StreamToken(token[0], 0, 0, 0)
end_token = StreamToken(token[1], 0, 0, 0)
time_now = self.clock.time_msec()
defer.returnValue({
"membership": member_event.membership,
"room_id": room_id,
"messages": {
"chunk": [serialize_event(m, time_now) for m in messages],
"start": start_token.to_string(),
"end": end_token.to_string(),
},
"state": [serialize_event(s, time_now) for s in room_state.values()],
"presence": [],
"receipts": [],
})
@defer.inlineCallbacks
def _room_initial_sync_joined(self, user_id, room_id, pagin_config,
member_event):
current_state = yield self.state.get_current_state(
room_id=room_id,
)
# TODO(paul): I wish I was called with user objects not user_id
@ -454,8 +523,6 @@ class MessageHandler(BaseHandler):
for x in current_state.values()
]
member_event = current_state.get((EventTypes.Member, user_id,))
now_token = yield self.hs.get_event_sources().get_current_token()
limit = pagin_config.limit if pagin_config else None

View file

@ -379,6 +379,21 @@ class StreamStore(SQLBaseStore):
)
defer.returnValue("t%d-%d" % (topo, token))
def get_stream_token_for_event(self, event_id):
"""The stream token for an event
Args:
event_id(str): The id of the event to look up a stream token for.
Raises:
StoreError if the event wasn't in the database.
Returns:
A deferred "s%d" stream token.
"""
return self._simple_select_one_onecol(
table="events",
keyvalues={"event_id": event_id},
retcol="stream_ordering",
).addCallback(lambda stream_ordering: "s%d" % (stream_ordering,))
def _get_max_topological_txn(self, txn):
txn.execute(
"SELECT MAX(topological_ordering) FROM events"