173 lines
6.6 KiB
Python
173 lines
6.6 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer
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from synapse.streams.config import PaginationConfig
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from synapse.types import StreamToken
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import synapse.util.async
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import logging
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logger = logging.getLogger(__name__)
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class Pusher(object):
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INITIAL_BACKOFF = 1000
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MAX_BACKOFF = 60 * 60 * 1000
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GIVE_UP_AFTER = 24 * 60 * 60 * 1000
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def __init__(self, _hs, user_name, app_id,
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app_display_name, device_display_name, pushkey, data,
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last_token, last_success, failing_since):
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self.hs = _hs
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self.evStreamHandler = self.hs.get_handlers().event_stream_handler
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self.store = self.hs.get_datastore()
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self.clock = self.hs.get_clock()
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self.user_name = user_name
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self.app_id = app_id
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self.app_display_name = app_display_name
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self.device_display_name = device_display_name
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self.pushkey = pushkey
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self.data = data
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self.last_token = last_token
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self.last_success = last_success # not actually used
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self.backoff_delay = Pusher.INITIAL_BACKOFF
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self.failing_since = failing_since
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self.alive = True
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def _should_notify_for_event(self, ev):
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"""
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This should take into account notification settings that the user
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has configured both globally and per-room when we have the ability
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to do such things.
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"""
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if ev['user_id'] == self.user_name:
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# let's assume you probably know about messages you sent yourself
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return False
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return True
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@defer.inlineCallbacks
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def start(self):
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if not self.last_token:
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# First-time setup: get a token to start from (we can't
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# just start from no token, ie. 'now'
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# because we need the result to be reproduceable in case
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# we fail to dispatch the push)
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config = PaginationConfig(from_token=None, limit='1')
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chunk = yield self.evStreamHandler.get_stream(
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self.user_name, config, timeout=0)
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self.last_token = chunk['end']
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self.store.update_pusher_last_token(
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self.user_name, self.pushkey, self.last_token)
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logger.info("Pusher %s for user %s starting from token %s",
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self.pushkey, self.user_name, self.last_token)
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while self.alive:
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from_tok = StreamToken.from_string(self.last_token)
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config = PaginationConfig(from_token=from_tok, limit='1')
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chunk = yield self.evStreamHandler.get_stream(
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self.user_name, config, timeout=100*365*24*60*60*1000)
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# limiting to 1 may get 1 event plus 1 presence event, so
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# pick out the actual event
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single_event = None
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for c in chunk['chunk']:
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if 'event_id' in c: # Hmmm...
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single_event = c
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break
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if not single_event:
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self.last_token = chunk['end']
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continue
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if not self.alive:
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continue
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processed = False
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if self._should_notify_for_event(single_event):
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processed = yield self.dispatch_push(single_event)
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else:
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processed = True
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if processed:
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self.backoff_delay = Pusher.INITIAL_BACKOFF
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self.last_token = chunk['end']
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self.store.update_pusher_last_token_and_success(
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self.user_name,
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self.pushkey,
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self.last_token,
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self.clock.time_msec()
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)
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if self.failing_since:
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self.failing_since = None
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self.store.update_pusher_failing_since(
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self.user_name,
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self.pushkey,
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self.failing_since)
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else:
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if not self.failing_since:
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self.failing_since = self.clock.time_msec()
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self.store.update_pusher_failing_since(
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self.user_name,
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self.pushkey,
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self.failing_since
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)
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if self.failing_since and \
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self.failing_since < \
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self.clock.time_msec() - Pusher.GIVE_UP_AFTER:
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# we really only give up so that if the URL gets
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# fixed, we don't suddenly deliver a load
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# of old notifications.
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logger.warn("Giving up on a notification to user %s, "
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"pushkey %s",
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self.user_name, self.pushkey)
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self.backoff_delay = Pusher.INITIAL_BACKOFF
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self.last_token = chunk['end']
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self.store.update_pusher_last_token(
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self.user_name,
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self.pushkey,
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self.last_token
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)
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self.failing_since = None
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self.store.update_pusher_failing_since(
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self.user_name,
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self.pushkey,
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self.failing_since
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)
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else:
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logger.warn("Failed to dispatch push for user %s "
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"(failing for %dms)."
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"Trying again in %dms",
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self.user_name,
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self.clock.time_msec() - self.failing_since,
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self.backoff_delay
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)
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yield synapse.util.async.sleep(self.backoff_delay / 1000.0)
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self.backoff_delay *= 2
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if self.backoff_delay > Pusher.MAX_BACKOFF:
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self.backoff_delay = Pusher.MAX_BACKOFF
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def stop(self):
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self.alive = False
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def dispatch_push(self, p):
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pass
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class PusherConfigException(Exception):
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def __init__(self, msg):
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super(PusherConfigException, self).__init__(msg) |