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# -*- coding: utf-8 -*-
# Copyright 2014 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 logging
logger = logging.getLogger(__name__)
class Pusher(object):
INITIAL_BACKOFF = 1000
MAX_BACKOFF = 60 * 60 * 1000
GIVE_UP_AFTER = 24 * 60 * 60 * 1000
def __init__(self, _hs, 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()
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
def _should_notify_for_event(self, ev):
"""
This should take into account notification settings that the user
has configured both globally and per-room when we have the ability
to do such things.
"""
if ev['user_id'] == self.user_name:
# let's assume you probably know about messages you sent yourself
return False
return True
@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)
self.last_token = chunk['end']
self.store.update_pusher_last_token(
self.user_name, self.pushkey, self.last_token)
logger.info("Pusher %s for user %s starting from token %s",
self.pushkey, self.user_name, self.last_token)
while self.alive:
from_tok = StreamToken.from_string(self.last_token)
config = PaginationConfig(from_token=from_tok, limit='1')
chunk = yield self.evStreamHandler.get_stream(
self.user_name, config,
timeout=100*365*24*60*60*1000, affect_presence=False
)
# 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']
continue
if not self.alive:
continue
processed = False
if self._should_notify_for_event(single_event):
rejected = yield self.dispatch_push(single_event)
if not rejected == False:
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
)
else:
processed = True
if not self.alive:
continue
if processed:
self.backoff_delay = Pusher.INITIAL_BACKOFF
self.last_token = chunk['end']
self.store.update_pusher_last_token_and_success(
self.user_name,
self.pushkey,
self.last_token,
self.clock.time_msec()
)
if self.failing_since:
self.failing_since = None
self.store.update_pusher_failing_since(
self.user_name,
self.pushkey,
self.failing_since)
else:
if not self.failing_since:
self.failing_since = self.clock.time_msec()
self.store.update_pusher_failing_since(
self.user_name,
self.pushkey,
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']
self.store.update_pusher_last_token(
self.user_name,
self.pushkey,
self.last_token
)
self.failing_since = None
self.store.update_pusher_failing_since(
self.user_name,
self.pushkey,
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
def dispatch_push(self, p):
"""
Overridden by implementing classes to actually deliver the notification
:param p: The event to notify for as a single event from the event stream
:return: 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
class PusherConfigException(Exception):
def __init__(self, msg):
super(PusherConfigException, self).__init__(msg)
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