synapse-product/synapse/handlers/presence.py

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# -*- 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.
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from twisted.internet import defer
from synapse.api.errors import SynapseError, AuthError
from synapse.api.constants import PresenceState
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from synapse.util.logutils import log_function
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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
self.clock = hs.get_clock()
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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):
defer.returnValue(True)
# return
# FIXME (erikj): This code path absolutely kills the database.
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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)
share_room = yield self.store.do_users_share_a_room(
[observer_user, observed_user]
)
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defer.returnValue(share_room)
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@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:
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state = yield self.store.get_presence_state(
target_user.localpart
)
else:
raise SynapseError(404, "Presence information not visible")
else:
# TODO(paul): Have remote server send us permissions set
state = self._get_or_offline_usercache(target_user).get_state()
if "mtime" in state and (state["mtime"] is not None):
state["mtime_age"] = int(
self.clock.time_msec() - state.pop("mtime")
)
defer.returnValue(state)
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@defer.inlineCallbacks
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@log_function
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def set_state(self, target_user, auth_user, state):
# return
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# TODO (erikj): Turn this back on. Why did we end up sending EDUs
# everywhere?
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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
),
])
state["mtime"] = self.clock.time_msec()
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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)
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)
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@log_function
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def started_user_eventstream(self, user):
# TODO(paul): Use "last online" state
self.set_state(user, user, {"state": PresenceState.ONLINE})
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@log_function
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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):
if user.is_mine:
self.push_update_to_local_and_remote(
observed_user=user,
room_ids=[room_id],
statuscache=self._get_or_offline_usercache(user),
)
else:
self.push_update_to_clients(
observed_user=user,
room_ids=[room_id],
statuscache=self._get_or_offline_usercache(user),
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)
# We also want to tell them about current presence of people.
rm_handler = self.homeserver.get_handlers().room_member_handler
curr_users = yield rm_handler.get_room_members(room_id)
for local_user in [c for c in curr_users if c.is_mine]:
self.push_update_to_local_and_remote(
observed_user=local_user,
users_to_push=[user],
statuscache=self._get_or_offline_usercache(local_user),
)
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@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())
if "mtime" in p:
p["mtime_age"] = int(
self.clock.time_msec() - p.pop("mtime")
)
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defer.returnValue(presence)
@defer.inlineCallbacks
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@log_function
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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 = set([target_user])
room_ids = []
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else:
presence = yield self.store.get_presence_list(
user.localpart, accepted=True
)
target_users = set([
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self.hs.parse_userid(x["observed_user_id"]) for x in presence
])
# Also include people in all my rooms
rm_handler = self.homeserver.get_handlers().room_member_handler
room_ids = yield rm_handler.get_rooms_for_user(user)
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if state is None:
state = yield self.store.get_presence_state(user.localpart)
else:
# statuscache = self._get_or_make_usercache(user)
# self._user_cachemap_latest_serial += 1
# statuscache.update(state, self._user_cachemap_latest_serial)
pass
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yield self.push_update_to_local_and_remote(
observed_user=user,
users_to_push=target_users,
room_ids=room_ids,
statuscache=self._get_or_make_usercache(user),
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)
for target_user in target_users:
if target_user.is_mine:
self._start_polling_local(user, target_user)
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# We want to tell the person that just came online
# presence state of people they are interested in?
self.push_update_to_clients(
observed_user=target_user,
users_to_push=[user],
statuscache=self._get_or_offline_usercache(target_user),
)
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deferreds = []
remote_users = [u for u in target_users if not u.is_mine]
remoteusers_by_domain = partition(remote_users, lambda u: u.domain)
# Only poll for people in our get_presence_list
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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)
def _start_polling_remote(self, user, domain, remoteusers):
to_poll = set()
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for u in remoteusers:
if u not in self._remote_recvmap:
self._remote_recvmap[u] = set()
to_poll.add(u)
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self._remote_recvmap[u].add(user)
if not to_poll:
return defer.succeed(None)
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return self.federation.send_edu(
destination=domain,
edu_type="m.presence",
content={"poll": [u.to_string() for u in to_poll]}
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)
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@log_function
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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:
if target_user not in self._remote_recvmap:
return
target_users = set([target_user])
else:
target_users = self._remote_recvmap.keys()
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remoteusers = [u for u in target_users
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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]
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@log_function
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def _stop_polling_remote(self, user, domain, remoteusers):
to_unpoll = set()
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for u in remoteusers:
self._remote_recvmap[u].remove(user)
if not self._remote_recvmap[u]:
del self._remote_recvmap[u]
to_unpoll.add(u)
if not to_unpoll:
return defer.succeed(None)
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return self.federation.send_edu(
destination=domain,
edu_type="m.presence",
content={"unpoll": [u.to_string() for u in to_unpoll]}
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)
@defer.inlineCallbacks
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@log_function
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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)
if not localusers and not room_ids:
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defer.returnValue(None)
yield self.push_update_to_local_and_remote(
observed_user=user,
users_to_push=localusers,
remote_domains=remotedomains,
room_ids=room_ids,
statuscache=statuscache,
)
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@defer.inlineCallbacks
def _push_presence_remote(self, user, destination, state=None):
if state is None:
state = yield self.store.get_presence_state(user.localpart)
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yield self.distributor.fire(
"collect_presencelike_data", user, state
)
if "mtime" in state:
state = dict(state)
state["mtime_age"] = int(
self.clock.time_msec() - state.pop("mtime")
)
user_state = {
"user_id": user.to_string(),
}
user_state.update(**state)
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yield self.federation.send_edu(
destination=destination,
edu_type="m.presence",
content={
"push": [
user_state,
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],
}
)
@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)
if not observers and not room_ids:
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break
state = dict(push)
del state["user_id"]
if "mtime_age" in state:
state["mtime"] = int(
self.clock.time_msec() - state.pop("mtime_age")
)
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statuscache = self._get_or_make_usercache(user)
self._user_cachemap_latest_serial += 1
statuscache.update(state, serial=self._user_cachemap_latest_serial)
self.push_update_to_clients(
observed_user=user,
users_to_push=observers,
room_ids=room_ids,
statuscache=statuscache,
)
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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)
@defer.inlineCallbacks
def push_update_to_local_and_remote(self, observed_user,
users_to_push=[], room_ids=[],
remote_domains=[],
statuscache=None):
localusers, remoteusers = partitionbool(
users_to_push,
lambda u: u.is_mine
)
localusers = set(localusers)
self.push_update_to_clients(
observed_user=observed_user,
users_to_push=localusers,
room_ids=room_ids,
statuscache=statuscache,
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)
remote_domains = set(remote_domains)
remote_domains |= set([r.domain for r in remoteusers])
for room_id in room_ids:
remote_domains.update(
(yield self.store.get_joined_hosts_for_room(room_id))
)
remote_domains.discard(self.hs.hostname)
deferreds = []
for domain in remote_domains:
logger.debug(" | push to remote domain %s", domain)
deferreds.append(
self._push_presence_remote(
observed_user, domain, state=statuscache.get_state()
)
)
yield defer.DeferredList(deferreds)
defer.returnValue((localusers, remote_domains))
def push_update_to_clients(self, observed_user, users_to_push=[],
room_ids=[], statuscache=None):
self.notifier.on_new_user_event(
users_to_push,
room_ids,
)
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class PresenceEventSource(object):
def __init__(self, hs):
self.hs = hs
self.clock = hs.get_clock()
def get_new_events_for_user(self, user, from_token, limit):
from_key = int(from_token.presence_key)
presence = self.hs.get_handlers().presence_handler
cachemap = presence._user_cachemap
# TODO(paul): limit, and filter by visibility
updates = [(k, cachemap[k]) for k in cachemap
if from_key < cachemap[k].serial]
if updates:
clock = self.clock
latest_serial = max([x[1].serial for x in updates])
data = [x[1].make_event(user=x[0], clock=clock) for x in updates]
end_token = from_token.copy_and_replace(
"presence_key", latest_serial
)
return ((data, end_token))
else:
end_token = from_token.copy_and_replace(
"presence_key", presence._user_cachemap_latest_serial
)
return (([], end_token))
def get_current_token_part(self):
presence = self.hs.get_handlers().presence_handler
return presence._user_cachemap_latest_serial
def get_pagination_rows(self, user, pagination_config, key):
# TODO (erikj): Does this make sense? Ordering?
from_token = pagination_config.from_token
to_token = pagination_config.to_token
from_key = int(from_token.presence_key)
if to_token:
to_key = int(to_token.presence_key)
else:
to_key = -1
presence = self.hs.get_handlers().presence_handler
cachemap = presence._user_cachemap
# TODO(paul): limit, and filter by visibility
updates = [(k, cachemap[k]) for k in cachemap
if to_key < cachemap[k].serial < from_key]
if updates:
clock = self.clock
earliest_serial = max([x[1].serial for x in updates])
data = [x[1].make_event(user=x[0], clock=clock) for x in updates]
if to_token:
next_token = to_token
else:
next_token = from_token
next_token = next_token.copy_and_replace(
"presence_key", earliest_serial
)
return ((data, next_token))
else:
if not to_token:
to_token = from_token.copy_and_replace(
"presence_key", 0
)
return (([], to_token))
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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):
assert("mtime_age" not in state)
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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, clock):
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content = self.get_state()
content["user_id"] = user.to_string()
if "mtime" in content:
content["mtime_age"] = int(
clock.time_msec() - content.pop("mtime")
)
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return {"type": "m.presence", "content": content}