MatrixSynapse/synapse/handlers/presence.py

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2014-08-12 16:10:52 +02:00
# -*- coding: utf-8 -*-
# Copyright 2014 matrix.org
#
# 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 twisted.internet import defer
from synapse.api.errors import SynapseError, AuthError
from synapse.api.constants import PresenceState
from synapse.api.streams import StreamData
from ._base import BaseHandler
import logging
logger = logging.getLogger(__name__)
# TODO(paul): Maybe there's one of these I can steal from somewhere
def partition(l, func):
"""Partition the list by the result of func applied to each element."""
ret = {}
for x in l:
key = func(x)
if key not in ret:
ret[key] = []
ret[key].append(x)
return ret
def partitionbool(l, func):
def boolfunc(x):
return bool(func(x))
ret = partition(l, boolfunc)
return ret.get(True, []), ret.get(False, [])
class PresenceHandler(BaseHandler):
def __init__(self, hs):
super(PresenceHandler, self).__init__(hs)
self.homeserver = hs
distributor = hs.get_distributor()
distributor.observe("registered_user", self.registered_user)
distributor.observe(
"started_user_eventstream", self.started_user_eventstream
)
distributor.observe(
"stopped_user_eventstream", self.stopped_user_eventstream
)
distributor.observe("user_joined_room",
self.user_joined_room
)
distributor.declare("collect_presencelike_data")
distributor.declare("changed_presencelike_data")
distributor.observe(
"changed_presencelike_data", self.changed_presencelike_data
)
self.distributor = distributor
self.federation = hs.get_replication_layer()
self.federation.register_edu_handler(
"m.presence", self.incoming_presence
)
self.federation.register_edu_handler(
"m.presence_invite",
lambda origin, content: self.invite_presence(
observed_user=hs.parse_userid(content["observed_user"]),
observer_user=hs.parse_userid(content["observer_user"]),
)
)
self.federation.register_edu_handler(
"m.presence_accept",
lambda origin, content: self.accept_presence(
observed_user=hs.parse_userid(content["observed_user"]),
observer_user=hs.parse_userid(content["observer_user"]),
)
)
self.federation.register_edu_handler(
"m.presence_deny",
lambda origin, content: self.deny_presence(
observed_user=hs.parse_userid(content["observed_user"]),
observer_user=hs.parse_userid(content["observer_user"]),
)
)
# IN-MEMORY store, mapping local userparts to sets of local users to
# be informed of state changes.
self._local_pushmap = {}
# map local users to sets of remote /domain names/ who are interested
# in them
self._remote_sendmap = {}
# map remote users to sets of local users who're interested in them
self._remote_recvmap = {}
# map any user to a UserPresenceCache
self._user_cachemap = {}
self._user_cachemap_latest_serial = 0
def _get_or_make_usercache(self, user):
"""If the cache entry doesn't exist, initialise a new one."""
if user not in self._user_cachemap:
self._user_cachemap[user] = UserPresenceCache()
return self._user_cachemap[user]
def _get_or_offline_usercache(self, user):
"""If the cache entry doesn't exist, return an OFFLINE one but do not
store it into the cache."""
if user in self._user_cachemap:
return self._user_cachemap[user]
else:
statuscache = UserPresenceCache()
statuscache.update({"state": PresenceState.OFFLINE}, user)
return statuscache
def registered_user(self, user):
self.store.create_presence(user.localpart)
@defer.inlineCallbacks
def is_presence_visible(self, observer_user, observed_user):
assert(observed_user.is_mine)
if observer_user == observed_user:
defer.returnValue(True)
allowed_by_subscription = yield self.store.is_presence_visible(
observed_localpart=observed_user.localpart,
observer_userid=observer_user.to_string(),
)
if allowed_by_subscription:
defer.returnValue(True)
# TODO(paul): Check same channel
defer.returnValue(False)
@defer.inlineCallbacks
def get_state(self, target_user, auth_user):
if target_user.is_mine:
visible = yield self.is_presence_visible(observer_user=auth_user,
observed_user=target_user
)
if visible:
state = yield self.store.get_presence_state(
target_user.localpart
)
defer.returnValue(state)
else:
raise SynapseError(404, "Presence information not visible")
else:
# TODO(paul): Have remote server send us permissions set
defer.returnValue(
self._get_or_offline_usercache(target_user).get_state()
)
@defer.inlineCallbacks
def set_state(self, target_user, auth_user, state):
if not target_user.is_mine:
raise SynapseError(400, "User is not hosted on this Home Server")
if target_user != auth_user:
raise AuthError(400, "Cannot set another user's displayname")
# TODO(paul): Sanity-check 'state'
if "status_msg" not in state:
state["status_msg"] = None
for k in state.keys():
if k not in ("state", "status_msg"):
raise SynapseError(
400, "Unexpected presence state key '%s'" % (k,)
)
logger.debug("Updating presence state of %s to %s",
target_user.localpart, state["state"])
state_to_store = dict(state)
yield defer.DeferredList([
self.store.set_presence_state(
target_user.localpart, state_to_store
),
self.distributor.fire(
"collect_presencelike_data", target_user, state
),
])
now_online = state["state"] != PresenceState.OFFLINE
was_polling = target_user in self._user_cachemap
if now_online and not was_polling:
self.start_polling_presence(target_user, state=state)
elif not now_online and was_polling:
self.stop_polling_presence(target_user)
# TODO(paul): perform a presence push as part of start/stop poll so
# we don't have to do this all the time
self.changed_presencelike_data(target_user, state)
if not now_online:
del self._user_cachemap[target_user]
def changed_presencelike_data(self, user, state):
statuscache = self._get_or_make_usercache(user)
self._user_cachemap_latest_serial += 1
statuscache.update(state, serial=self._user_cachemap_latest_serial)
self.push_presence(user, statuscache=statuscache)
def started_user_eventstream(self, user):
# TODO(paul): Use "last online" state
self.set_state(user, user, {"state": PresenceState.ONLINE})
def stopped_user_eventstream(self, user):
# TODO(paul): Save current state as "last online" state
self.set_state(user, user, {"state": PresenceState.OFFLINE})
@defer.inlineCallbacks
def user_joined_room(self, user, room_id):
localusers = set()
remotedomains = set()
rm_handler = self.homeserver.get_handlers().room_member_handler
yield rm_handler.fetch_room_distributions_into(room_id,
localusers=localusers, remotedomains=remotedomains,
ignore_user=user)
if user.is_mine:
yield self._send_presence_to_distribution(srcuser=user,
localusers=localusers, remotedomains=remotedomains,
statuscache=self._get_or_offline_usercache(user),
)
for srcuser in localusers:
yield self._send_presence(srcuser=srcuser, destuser=user,
statuscache=self._get_or_offline_usercache(srcuser),
)
@defer.inlineCallbacks
def send_invite(self, observer_user, observed_user):
if not observer_user.is_mine:
raise SynapseError(400, "User is not hosted on this Home Server")
yield self.store.add_presence_list_pending(
observer_user.localpart, observed_user.to_string()
)
if observed_user.is_mine:
yield self.invite_presence(observed_user, observer_user)
else:
yield self.federation.send_edu(
destination=observed_user.domain,
edu_type="m.presence_invite",
content={
"observed_user": observed_user.to_string(),
"observer_user": observer_user.to_string(),
}
)
@defer.inlineCallbacks
def _should_accept_invite(self, observed_user, observer_user):
if not observed_user.is_mine:
defer.returnValue(False)
row = yield self.store.has_presence_state(observed_user.localpart)
if not row:
defer.returnValue(False)
# TODO(paul): Eventually we'll ask the user's permission for this
# before accepting. For now just accept any invite request
defer.returnValue(True)
@defer.inlineCallbacks
def invite_presence(self, observed_user, observer_user):
accept = yield self._should_accept_invite(observed_user, observer_user)
if accept:
yield self.store.allow_presence_visible(
observed_user.localpart, observer_user.to_string()
)
if observer_user.is_mine:
if accept:
yield self.accept_presence(observed_user, observer_user)
else:
yield self.deny_presence(observed_user, observer_user)
else:
edu_type = "m.presence_accept" if accept else "m.presence_deny"
yield self.federation.send_edu(
destination=observer_user.domain,
edu_type=edu_type,
content={
"observed_user": observed_user.to_string(),
"observer_user": observer_user.to_string(),
}
)
@defer.inlineCallbacks
def accept_presence(self, observed_user, observer_user):
yield self.store.set_presence_list_accepted(
observer_user.localpart, observed_user.to_string()
)
self.start_polling_presence(observer_user, target_user=observed_user)
@defer.inlineCallbacks
def deny_presence(self, observed_user, observer_user):
yield self.store.del_presence_list(
observer_user.localpart, observed_user.to_string()
)
# TODO(paul): Inform the user somehow?
@defer.inlineCallbacks
def drop(self, observed_user, observer_user):
if not observer_user.is_mine:
raise SynapseError(400, "User is not hosted on this Home Server")
yield self.store.del_presence_list(
observer_user.localpart, observed_user.to_string()
)
self.stop_polling_presence(observer_user, target_user=observed_user)
@defer.inlineCallbacks
def get_presence_list(self, observer_user, accepted=None):
if not observer_user.is_mine:
raise SynapseError(400, "User is not hosted on this Home Server")
presence = yield self.store.get_presence_list(
observer_user.localpart, accepted=accepted
)
for p in presence:
observed_user = self.hs.parse_userid(p.pop("observed_user_id"))
p["observed_user"] = observed_user
p.update(self._get_or_offline_usercache(observed_user).get_state())
defer.returnValue(presence)
@defer.inlineCallbacks
def start_polling_presence(self, user, target_user=None, state=None):
logger.debug("Start polling for presence from %s", user)
if target_user:
target_users = [target_user]
else:
presence = yield self.store.get_presence_list(
user.localpart, accepted=True
)
target_users = [
self.hs.parse_userid(x["observed_user_id"]) for x in presence
]
if state is None:
state = yield self.store.get_presence_state(user.localpart)
localusers, remoteusers = partitionbool(
target_users,
lambda u: u.is_mine
)
for target_user in localusers:
self._start_polling_local(user, target_user)
deferreds = []
remoteusers_by_domain = partition(remoteusers, lambda u: u.domain)
for domain in remoteusers_by_domain:
remoteusers = remoteusers_by_domain[domain]
deferreds.append(self._start_polling_remote(
user, domain, remoteusers
))
yield defer.DeferredList(deferreds)
def _start_polling_local(self, user, target_user):
target_localpart = target_user.localpart
if not self.is_presence_visible(observer_user=user,
observed_user=target_user):
return
if target_localpart not in self._local_pushmap:
self._local_pushmap[target_localpart] = set()
self._local_pushmap[target_localpart].add(user)
self.push_update_to_clients(
observer_user=user,
observed_user=target_user,
statuscache=self._get_or_offline_usercache(target_user),
)
def _start_polling_remote(self, user, domain, remoteusers):
for u in remoteusers:
if u not in self._remote_recvmap:
self._remote_recvmap[u] = set()
self._remote_recvmap[u].add(user)
return self.federation.send_edu(
destination=domain,
edu_type="m.presence",
content={"poll": [u.to_string() for u in remoteusers]}
)
def stop_polling_presence(self, user, target_user=None):
logger.debug("Stop polling for presence from %s", user)
if not target_user or target_user.is_mine:
self._stop_polling_local(user, target_user=target_user)
deferreds = []
if target_user:
raise NotImplementedError("TODO: remove one user")
remoteusers = [u for u in self._remote_recvmap
if user in self._remote_recvmap[u]]
remoteusers_by_domain = partition(remoteusers, lambda u: u.domain)
for domain in remoteusers_by_domain:
remoteusers = remoteusers_by_domain[domain]
deferreds.append(
self._stop_polling_remote(user, domain, remoteusers)
)
return defer.DeferredList(deferreds)
def _stop_polling_local(self, user, target_user):
for localpart in self._local_pushmap.keys():
if target_user and localpart != target_user.localpart:
continue
if user in self._local_pushmap[localpart]:
self._local_pushmap[localpart].remove(user)
if not self._local_pushmap[localpart]:
del self._local_pushmap[localpart]
def _stop_polling_remote(self, user, domain, remoteusers):
for u in remoteusers:
self._remote_recvmap[u].remove(user)
if not self._remote_recvmap[u]:
del self._remote_recvmap[u]
return self.federation.send_edu(
destination=domain,
edu_type="m.presence",
content={"unpoll": [u.to_string() for u in remoteusers]}
)
@defer.inlineCallbacks
def push_presence(self, user, statuscache):
assert(user.is_mine)
logger.debug("Pushing presence update from %s", user)
localusers = set(self._local_pushmap.get(user.localpart, set()))
remotedomains = set(self._remote_sendmap.get(user.localpart, set()))
# Reflect users' status changes back to themselves, so UIs look nice
# and also user is informed of server-forced pushes
localusers.add(user)
rm_handler = self.homeserver.get_handlers().room_member_handler
room_ids = yield rm_handler.get_rooms_for_user(user)
for room_id in room_ids:
yield rm_handler.fetch_room_distributions_into(
room_id, localusers=localusers, remotedomains=remotedomains,
ignore_user=user,
)
if not localusers and not remotedomains:
defer.returnValue(None)
yield self._send_presence_to_distribution(user,
localusers=localusers, remotedomains=remotedomains,
statuscache=statuscache
)
def _send_presence(self, srcuser, destuser, statuscache):
if destuser.is_mine:
self.push_update_to_clients(
observer_user=destuser,
observed_user=srcuser,
statuscache=statuscache)
return defer.succeed(None)
else:
return self._push_presence_remote(srcuser, destuser.domain,
state=statuscache.get_state()
)
@defer.inlineCallbacks
def _send_presence_to_distribution(self, srcuser, localusers=set(),
remotedomains=set(), statuscache=None):
for u in localusers:
logger.debug(" | push to local user %s", u)
self.push_update_to_clients(
observer_user=u,
observed_user=srcuser,
statuscache=statuscache,
)
deferreds = []
for domain in remotedomains:
logger.debug(" | push to remote domain %s", domain)
deferreds.append(self._push_presence_remote(srcuser, domain,
state=statuscache.get_state())
)
yield defer.DeferredList(deferreds)
@defer.inlineCallbacks
def _push_presence_remote(self, user, destination, state=None):
if state is None:
state = yield self.store.get_presence_state(user.localpart)
yield self.distributor.fire(
"collect_presencelike_data", user, state
)
yield self.federation.send_edu(
destination=destination,
edu_type="m.presence",
content={
"push": [
dict(user_id=user.to_string(), **state),
],
}
)
@defer.inlineCallbacks
def incoming_presence(self, origin, content):
deferreds = []
for push in content.get("push", []):
user = self.hs.parse_userid(push["user_id"])
logger.debug("Incoming presence update from %s", user)
observers = set(self._remote_recvmap.get(user, set()))
rm_handler = self.homeserver.get_handlers().room_member_handler
room_ids = yield rm_handler.get_rooms_for_user(user)
for room_id in room_ids:
yield rm_handler.fetch_room_distributions_into(
room_id, localusers=observers, ignore_user=user
)
if not observers:
break
state = dict(push)
del state["user_id"]
statuscache = self._get_or_make_usercache(user)
self._user_cachemap_latest_serial += 1
statuscache.update(state, serial=self._user_cachemap_latest_serial)
for observer_user in observers:
self.push_update_to_clients(
observer_user=observer_user,
observed_user=user,
statuscache=statuscache,
)
if state["state"] == PresenceState.OFFLINE:
del self._user_cachemap[user]
for poll in content.get("poll", []):
user = self.hs.parse_userid(poll)
if not user.is_mine:
continue
# TODO(paul) permissions checks
if not user in self._remote_sendmap:
self._remote_sendmap[user] = set()
self._remote_sendmap[user].add(origin)
deferreds.append(self._push_presence_remote(user, origin))
for unpoll in content.get("unpoll", []):
user = self.hs.parse_userid(unpoll)
if not user.is_mine:
continue
if user in self._remote_sendmap:
self._remote_sendmap[user].remove(origin)
if not self._remote_sendmap[user]:
del self._remote_sendmap[user]
yield defer.DeferredList(deferreds)
def push_update_to_clients(self, observer_user, observed_user,
statuscache):
self.notifier.on_new_user_event(
observer_user.to_string(),
event_data=statuscache.make_event(user=observed_user),
stream_type=PresenceStreamData,
store_id=statuscache.serial
)
class PresenceStreamData(StreamData):
def __init__(self, hs):
super(PresenceStreamData, self).__init__(hs)
self.presence = hs.get_handlers().presence_handler
def get_rows(self, user_id, from_key, to_key, limit):
cachemap = self.presence._user_cachemap
# TODO(paul): limit, and filter by visibility
updates = [(k, cachemap[k]) for k in cachemap
if from_key < cachemap[k].serial <= to_key]
if updates:
latest_serial = max([x[1].serial for x in updates])
data = [x[1].make_event(user=x[0]) for x in updates]
return ((data, latest_serial))
else:
return (([], self.presence._user_cachemap_latest_serial))
def max_token(self):
return self.presence._user_cachemap_latest_serial
PresenceStreamData.EVENT_TYPE = PresenceStreamData
class UserPresenceCache(object):
"""Store an observed user's state and status message.
Includes the update timestamp.
"""
def __init__(self):
self.state = {}
self.serial = None
def update(self, state, serial):
self.state.update(state)
# Delete keys that are now 'None'
for k in self.state.keys():
if self.state[k] is None:
del self.state[k]
self.serial = serial
if "status_msg" in state:
self.status_msg = state["status_msg"]
else:
self.status_msg = None
def get_state(self):
# clone it so caller can't break our cache
return dict(self.state)
def make_event(self, user):
content = self.get_state()
content["user_id"] = user.to_string()
return {"type": "m.presence", "content": content}