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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, app_display_name, device_display_name, pushkey, 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 = app
self.app_display_name = app_display_name
self.device_display_name = device_display_name
self.pushkey = pushkey
self.data = data
self.last_token = last_token
self.backoff_delay = Pusher.INITIAL_BACKOFF
self.failing_since = None
@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 True:
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)
# limiting to 1 may get 1 event plus 1 presence event, so pick out the actual event
singleEvent = None
for c in chunk['chunk']:
if 'event_id' in c: # Hmmm...
singleEvent = c
break
if not singleEvent:
continue
ret = yield self.dispatchPush(singleEvent)
if (ret):
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
class PusherConfigException(Exception):
def __init__(self, msg):
super(PusherConfigException, self).__init__(msg)
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