diff --git a/synapse/push/__init__.py b/synapse/push/__init__.py
new file mode 100644
index 0000000000..a96f0f0183
--- /dev/null
+++ b/synapse/push/__init__.py
@@ -0,0 +1,114 @@
+# -*- 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)
\ No newline at end of file
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