Merge changes from develop

1 files changed, 319 insertions, 0 deletions

diff --git a/synapse/push/__init__.py b/synapse/push/__init__.py
new file mode 100644
index 0000000000..10ac890482
--- /dev/null
+++ b/synapse/push/__init__.py
@@ -0,0 +1,319 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 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
+import fnmatch
+import json
+
+logger = logging.getLogger(__name__)
+
+
+class Pusher(object):
+    INITIAL_BACKOFF = 1000
+    MAX_BACKOFF = 60 * 60 * 1000
+    GIVE_UP_AFTER = 24 * 60 * 60 * 1000
+    DEFAULT_ACTIONS = ['notify']
+
+    def __init__(self, _hs, instance_handle, 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.instance_handle = instance_handle
+        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
+
+        # The last value of last_active_time that we saw
+        self.last_last_active_time = 0
+
+    @defer.inlineCallbacks
+    def _actions_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
+            defer.returnValue(['dont_notify'])
+
+        if ev['type'] == 'm.room.member':
+            if ev['state_key'] != self.user_name:
+                defer.returnValue(['dont_notify'])
+
+        rules = yield self.store.get_push_rules_for_user_name(self.user_name)
+
+        for r in rules:
+            matches = True
+
+            conditions = json.loads(r['conditions'])
+            actions = json.loads(r['actions'])
+
+            for c in conditions:
+                matches &= self._event_fulfills_condition(ev, c)
+            # ignore rules with no actions (we have an explict 'dont_notify'
+            if len(actions) == 0:
+                logger.warn(
+                    "Ignoring rule id %s with no actions for user %s" %
+                    (r['rule_id'], r['user_name'])
+                )
+                continue
+            if matches:
+                defer.returnValue(actions)
+
+        defer.returnValue(Pusher.DEFAULT_ACTIONS)
+
+    def _event_fulfills_condition(self, ev, condition):
+        if condition['kind'] == 'event_match':
+            if 'pattern' not in condition:
+                logger.warn("event_match condition with no pattern")
+                return False
+            pat = condition['pattern']
+
+            val = _value_for_dotted_key(condition['key'], ev)
+            if fnmatch.fnmatch(val, pat):
+                return True
+            return False
+        elif condition['kind'] == 'device':
+            if 'instance_handle' not in condition:
+                return True
+            return condition['instance_handle'] == self.instance_handle
+        else:
+            return True
+
+    @defer.inlineCallbacks
+    def get_context_for_event(self, ev):
+        name_aliases = yield self.store.get_room_name_and_aliases(
+            ev['room_id']
+        )
+
+        ctx = {'aliases': name_aliases[1]}
+        if name_aliases[0] is not None:
+            ctx['name'] = name_aliases[0]
+
+        defer.returnValue(ctx)
+
+    @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
+            actions = yield self._actions_for_event(single_event)
+            tweaks = _tweaks_for_actions(actions)
+
+            if len(actions) == 0:
+                logger.warn("Empty actions! Using default action.")
+                actions = Pusher.DEFAULT_ACTIONS
+            if 'notify' not in actions and 'dont_notify' not in actions:
+                logger.warn("Neither notify nor dont_notify in actions: adding default")
+                actions.extend(Pusher.DEFAULT_ACTIONS)
+            if 'dont_notify' in actions:
+                logger.debug(
+                    "%s for %s: dont_notify",
+                    single_event['event_id'], self.user_name
+                )
+                processed = True
+            else:
+                rejected = yield self.dispatch_push(single_event, tweaks)
+                if isinstance(rejected, list) or isinstance(rejected, tuple):
+                    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
+                            )
+
+            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, tweaks):
+        """
+        Overridden by implementing classes to actually deliver the notification
+        Args:
+            p: The event to notify for as a single event from the event stream
+        Returns: 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
+
+    def reset_badge_count(self):
+        pass
+
+    def presence_changed(self, state):
+        """
+        We clear badge counts whenever a user's last_active time is bumped
+        This is by no means perfect but I think it's the best we can do
+        without read receipts.
+        """
+        if 'last_active' in state.state:
+            last_active = state.state['last_active']
+            if last_active > self.last_last_active_time:
+                logger.info("Resetting badge count for %s", self.user_name)
+                self.reset_badge_count()
+                self.last_last_active_time = last_active
+
+
+def _value_for_dotted_key(dotted_key, event):
+    parts = dotted_key.split(".")
+    val = event
+    while len(parts) > 0:
+        if parts[0] not in val:
+            return None
+        val = val[parts[0]]
+        parts = parts[1:]
+    return val
+
+def _tweaks_for_actions(actions):
+    tweaks = {}
+    for a in actions:
+        if not isinstance(a, dict):
+            continue
+        if 'set_sound' in a:
+            tweaks['sound'] = a['set_sound']
+    return tweaks
+
+class PusherConfigException(Exception):
+    def __init__(self, msg):
+        super(PusherConfigException, self).__init__(msg)
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