76 lines
3.2 KiB
Python
76 lines
3.2 KiB
Python
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# -*- 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 = 10 * 60 * 1000
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def __init__(self, _hs, user_name, app, app_display_name, device_display_name, pushkey, data, last_token):
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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.user_name = user_name
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self.app = app
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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.backoff_delay = Pusher.INITIAL_BACKOFF
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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 just start from no token, ie. 'now'
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# because we need the result to be reproduceable in case 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(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(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 True:
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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(self.user_name, config, timeout=100*365*24*60*60*1000)
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if (self.dispatchPush(chunk['chunk'][0])):
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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(self.user_name, self.pushkey, self.last_token)
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else:
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logger.warn("Failed to dispatch push for user %s. Trying again in %dms",
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self.user_name, self.backoff_delay)
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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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class PusherConfigException(Exception):
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def __init__(self, msg):
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super(PusherConfigException, self).__init__(msg)
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