synapse-product/synapse/push/__init__.py

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# -*- coding: utf-8 -*-
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# Copyright 2015 OpenMarket 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.
from twisted.internet import defer
from synapse.streams.config import PaginationConfig
from synapse.types import StreamToken
import synapse.util.async
import push_rule_evaluator as push_rule_evaluator
import logging
import random
logger = logging.getLogger(__name__)
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# Pushers could now be moved to pull out of the event_actions table instead
# of listening on the event stream: this would avoid them having to run the
# rules again.
class Pusher(object):
INITIAL_BACKOFF = 1000
MAX_BACKOFF = 60 * 60 * 1000
GIVE_UP_AFTER = 24 * 60 * 60 * 1000
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def __init__(self, _hs, profile_tag, user_name, app_id,
app_display_name, device_display_name, pushkey, pushkey_ts,
data, last_token, last_success, failing_since):
self.hs = _hs
self.evStreamHandler = self.hs.get_handlers().event_stream_handler
self.store = self.hs.get_datastore()
self.clock = self.hs.get_clock()
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self.profile_tag = profile_tag
self.user_name = user_name
self.app_id = app_id
self.app_display_name = app_display_name
self.device_display_name = device_display_name
self.pushkey = pushkey
self.pushkey_ts = pushkey_ts
self.data = data
self.last_token = last_token
self.last_success = last_success # not actually used
self.backoff_delay = Pusher.INITIAL_BACKOFF
self.failing_since = failing_since
self.alive = True
# The last value of last_active_time that we saw
self.last_last_active_time = 0
self.has_unread = True
@defer.inlineCallbacks
def get_context_for_event(self, ev):
name_aliases = yield self.store.get_room_name_and_aliases(
ev['room_id']
)
ctx = {'aliases': name_aliases[1]}
if name_aliases[0] is not None:
ctx['name'] = name_aliases[0]
their_member_events_for_room = yield self.store.get_current_state(
room_id=ev['room_id'],
event_type='m.room.member',
state_key=ev['user_id']
)
for mev in their_member_events_for_room:
if mev.content['membership'] == 'join' and 'displayname' in mev.content:
dn = mev.content['displayname']
if dn is not None:
ctx['sender_display_name'] = dn
defer.returnValue(ctx)
@defer.inlineCallbacks
def start(self):
if not self.last_token:
# First-time setup: get a token to start from (we can't
# just start from no token, ie. 'now'
# because we need the result to be reproduceable in case
# we fail to dispatch the push)
config = PaginationConfig(from_token=None, limit='1')
chunk = yield self.evStreamHandler.get_stream(
self.user_name, config, timeout=0, affect_presence=False,
only_room_events=True
)
self.last_token = chunk['end']
self.store.update_pusher_last_token(
self.app_id, self.pushkey, self.user_name, self.last_token
)
logger.info("Pusher %s for user %s starting from token %s",
self.pushkey, self.user_name, self.last_token)
wait = 0
while self.alive:
try:
if wait > 0:
yield synapse.util.async.sleep(wait)
yield self.get_and_dispatch()
wait = 0
except:
if wait == 0:
wait = 1
else:
wait = min(wait * 2, 1800)
logger.exception(
"Exception in pusher loop for pushkey %s. Pausing for %ds",
self.pushkey, wait
)
@defer.inlineCallbacks
def get_and_dispatch(self):
from_tok = StreamToken.from_string(self.last_token)
config = PaginationConfig(from_token=from_tok, limit='1')
timeout = (300 + random.randint(-60, 60)) * 1000
chunk = yield self.evStreamHandler.get_stream(
self.user_name, config, timeout=timeout, affect_presence=False,
only_room_events=True
)
# limiting to 1 may get 1 event plus 1 presence event, so
# pick out the actual event
single_event = None
for c in chunk['chunk']:
if 'event_id' in c: # Hmmm...
single_event = c
break
if not single_event:
self.last_token = chunk['end']
logger.debug("Event stream timeout for pushkey %s", self.pushkey)
yield self.store.update_pusher_last_token(
self.app_id,
self.pushkey,
self.user_name,
self.last_token
)
return
if not self.alive:
return
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processed = False
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rule_evaluator = yield \
push_rule_evaluator.evaluator_for_user_name_and_profile_tag(
self.user_name, self.profile_tag, single_event['room_id'], self.store
)
actions = yield rule_evaluator.actions_for_event(single_event)
tweaks = rule_evaluator.tweaks_for_actions(actions)
if 'notify' in actions:
rejected = yield self.dispatch_push(single_event, tweaks)
self.has_unread = True
if isinstance(rejected, list) or isinstance(rejected, tuple):
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processed = True
for pk in rejected:
if pk != self.pushkey:
# for sanity, we only remove the pushkey if it
# was the one we actually sent...
logger.warn(
("Ignoring rejected pushkey %s because we"
" didn't send it"), pk
)
else:
logger.info(
"Pushkey %s was rejected: removing",
pk
)
yield self.hs.get_pusherpool().remove_pusher(
self.app_id, pk, self.user_name
)
else:
processed = True
if not self.alive:
return
if processed:
self.backoff_delay = Pusher.INITIAL_BACKOFF
self.last_token = chunk['end']
yield self.store.update_pusher_last_token_and_success(
self.app_id,
self.pushkey,
self.user_name,
self.last_token,
self.clock.time_msec()
)
if self.failing_since:
self.failing_since = None
yield self.store.update_pusher_failing_since(
self.app_id,
self.pushkey,
self.user_name,
self.failing_since)
else:
if not self.failing_since:
self.failing_since = self.clock.time_msec()
yield self.store.update_pusher_failing_since(
self.app_id,
self.pushkey,
self.user_name,
self.failing_since
)
if (self.failing_since and
self.failing_since <
self.clock.time_msec() - Pusher.GIVE_UP_AFTER):
# we really only give up so that if the URL gets
# fixed, we don't suddenly deliver a load
# of old notifications.
logger.warn("Giving up on a notification to user %s, "
"pushkey %s",
self.user_name, self.pushkey)
self.backoff_delay = Pusher.INITIAL_BACKOFF
self.last_token = chunk['end']
yield self.store.update_pusher_last_token(
self.app_id,
self.pushkey,
self.user_name,
self.last_token
)
self.failing_since = None
yield self.store.update_pusher_failing_since(
self.app_id,
self.pushkey,
self.user_name,
self.failing_since
)
else:
logger.warn("Failed to dispatch push for user %s "
"(failing for %dms)."
"Trying again in %dms",
self.user_name,
self.clock.time_msec() - self.failing_since,
self.backoff_delay)
yield synapse.util.async.sleep(self.backoff_delay / 1000.0)
self.backoff_delay *= 2
if self.backoff_delay > Pusher.MAX_BACKOFF:
self.backoff_delay = Pusher.MAX_BACKOFF
def stop(self):
self.alive = False
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def dispatch_push(self, p, tweaks):
"""
Overridden by implementing classes to actually deliver the notification
Args:
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p: The event to notify for as a single event from the event stream
Returns: If the notification was delivered, an array containing any
pushkeys that were rejected by the push gateway.
False if the notification could not be delivered (ie.
should be retried).
"""
pass
def reset_badge_count(self):
pass
def presence_changed(self, state):
"""
We clear badge counts whenever a user's last_active time is bumped
This is by no means perfect but I think it's the best we can do
without read receipts.
"""
if 'last_active' in state.state:
last_active = state.state['last_active']
if last_active > self.last_last_active_time:
self.last_last_active_time = last_active
if self.has_unread:
logger.info("Resetting badge count for %s", self.user_name)
self.reset_badge_count()
self.has_unread = False
class PusherConfigException(Exception):
def __init__(self, msg):
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super(PusherConfigException, self).__init__(msg)