# Copyright 2015, 2016 OpenMarket Ltd # Copyright 2017 New Vector 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. import logging import random import urllib.parse from typing import TYPE_CHECKING, Dict, List, Optional, Union from prometheus_client import Counter from twisted.internet.error import AlreadyCalled, AlreadyCancelled from twisted.internet.interfaces import IDelayedCall from synapse.api.constants import EventTypes from synapse.events import EventBase from synapse.logging import opentracing from synapse.metrics.background_process_metrics import run_as_background_process from synapse.push import Pusher, PusherConfig, PusherConfigException from synapse.storage.databases.main.event_push_actions import HttpPushAction from synapse.types import JsonDict, JsonMapping from . import push_tools if TYPE_CHECKING: from synapse.server import HomeServer logger = logging.getLogger(__name__) http_push_processed_counter = Counter( "synapse_http_httppusher_http_pushes_processed", "Number of push notifications successfully sent", ) http_push_failed_counter = Counter( "synapse_http_httppusher_http_pushes_failed", "Number of push notifications which failed", ) http_badges_processed_counter = Counter( "synapse_http_httppusher_badge_updates_processed", "Number of badge updates successfully sent", ) http_badges_failed_counter = Counter( "synapse_http_httppusher_badge_updates_failed", "Number of badge updates which failed", ) def tweaks_for_actions(actions: List[Union[str, Dict]]) -> JsonMapping: """ Converts a list of actions into a `tweaks` dict (which can then be passed to the push gateway). This function ignores all actions other than `set_tweak` actions, and treats absent `value`s as `True`, which agrees with the only spec-defined treatment of absent `value`s (namely, for `highlight` tweaks). Args: actions: list of actions e.g. [ {"set_tweak": "a", "value": "AAA"}, {"set_tweak": "b", "value": "BBB"}, {"set_tweak": "highlight"}, "notify" ] Returns: dictionary of tweaks for those actions e.g. {"a": "AAA", "b": "BBB", "highlight": True} """ tweaks = {} for a in actions: if not isinstance(a, dict): continue if "set_tweak" in a: # value is allowed to be absent in which case the value assumed # should be True. tweaks[a["set_tweak"]] = a.get("value", True) return tweaks class HttpPusher(Pusher): INITIAL_BACKOFF_SEC = 1 # in seconds because that's what Twisted takes MAX_BACKOFF_SEC = 60 * 60 # This one's in ms because we compare it against the clock GIVE_UP_AFTER_MS = 24 * 60 * 60 * 1000 def __init__(self, hs: "HomeServer", pusher_config: PusherConfig): super().__init__(hs, pusher_config) self._storage_controllers = self.hs.get_storage_controllers() self.app_display_name = pusher_config.app_display_name self.device_display_name = pusher_config.device_display_name self.device_id = pusher_config.device_id self.pushkey_ts = pusher_config.ts self.data = pusher_config.data self.backoff_delay = HttpPusher.INITIAL_BACKOFF_SEC self.failing_since = pusher_config.failing_since self.timed_call: Optional[IDelayedCall] = None self._is_processing = False self._group_unread_count_by_room = ( hs.config.push.push_group_unread_count_by_room ) self._pusherpool = hs.get_pusherpool() self.push_jitter_delay_ms = hs.config.push.push_jitter_delay_ms self.data = pusher_config.data if self.data is None: raise PusherConfigException("'data' key can not be null for HTTP pusher") self.name = "%s/%s/%s" % ( pusher_config.user_name, pusher_config.app_id, pusher_config.pushkey, ) # Validate that there's a URL and it is of the proper form. if "url" not in self.data: raise PusherConfigException("'url' required in data for HTTP pusher") url = self.data["url"] if not isinstance(url, str): raise PusherConfigException("'url' must be a string") url_parts = urllib.parse.urlparse(url) # Note that the specification also says the scheme must be HTTPS, but # it isn't up to the homeserver to verify that. if url_parts.path != "/_matrix/push/v1/notify": raise PusherConfigException( "'url' must have a path of '/_matrix/push/v1/notify'" ) self.url = url self.http_client = hs.get_pusher_http_client() self.data_minus_url = {} self.data_minus_url.update(self.data) del self.data_minus_url["url"] self.badge_count_last_call: Optional[int] = None def on_started(self, should_check_for_notifs: bool) -> None: """Called when this pusher has been started. Args: should_check_for_notifs: Whether we should immediately check for push to send. Set to False only if it's known there is nothing to send """ if should_check_for_notifs: self._start_processing() def on_new_receipts(self, min_stream_id: int, max_stream_id: int) -> None: # Note that the min here shouldn't be relied upon to be accurate. # We could check the receipts are actually m.read receipts here, # but currently that's the only type of receipt anyway... run_as_background_process("http_pusher.on_new_receipts", self._update_badge) async def _update_badge(self) -> None: # XXX as per https://github.com/matrix-org/matrix-doc/issues/2627, this seems # to be largely redundant. perhaps we can remove it. badge = await push_tools.get_badge_count( self.hs.get_datastores().main, self.user_id, group_by_room=self._group_unread_count_by_room, ) if self.badge_count_last_call is None or self.badge_count_last_call != badge: self.badge_count_last_call = badge await self._send_badge(badge) def on_timer(self) -> None: self._start_processing() def on_stop(self) -> None: if self.timed_call: try: self.timed_call.cancel() except (AlreadyCalled, AlreadyCancelled): pass self.timed_call = None def _start_processing(self) -> None: if self._is_processing: return run_as_background_process("httppush.process", self._process) async def _process(self) -> None: # we should never get here if we are already processing assert not self._is_processing try: self._is_processing = True # if the max ordering changes while we're running _unsafe_process, # call it again, and so on until we've caught up. while True: starting_max_ordering = self.max_stream_ordering try: await self._unsafe_process() except Exception: logger.exception("Exception processing notifs") if self.max_stream_ordering == starting_max_ordering: break finally: self._is_processing = False async def _unsafe_process(self) -> None: """ Looks for unset notifications and dispatch them, in order Never call this directly: use _process which will only allow this to run once per pusher. """ unprocessed = ( await self.store.get_unread_push_actions_for_user_in_range_for_http( self.user_id, self.last_stream_ordering, self.max_stream_ordering ) ) logger.info( "Processing %i unprocessed push actions for %s starting at " "stream_ordering %s", len(unprocessed), self.name, self.last_stream_ordering, ) for push_action in unprocessed: with opentracing.start_active_span( "http-push", tags={ "authenticated_entity": self.user_id, "event_id": push_action.event_id, "app_id": self.app_id, "app_display_name": self.app_display_name, }, ): processed = await self._process_one(push_action) if processed: http_push_processed_counter.inc() self.backoff_delay = HttpPusher.INITIAL_BACKOFF_SEC self.last_stream_ordering = push_action.stream_ordering pusher_still_exists = ( await self.store.update_pusher_last_stream_ordering_and_success( self.app_id, self.pushkey, self.user_id, self.last_stream_ordering, self.clock.time_msec(), ) ) if not pusher_still_exists: # The pusher has been deleted while we were processing, so # lets just stop and return. self.on_stop() return if self.failing_since: self.failing_since = None await self.store.update_pusher_failing_since( self.app_id, self.pushkey, self.user_id, self.failing_since ) else: http_push_failed_counter.inc() if not self.failing_since: self.failing_since = self.clock.time_msec() await self.store.update_pusher_failing_since( self.app_id, self.pushkey, self.user_id, self.failing_since ) if ( self.failing_since and self.failing_since < self.clock.time_msec() - HttpPusher.GIVE_UP_AFTER_MS ): # we really only give up so that if the URL gets # fixed, we don't suddenly deliver a load # of old notifications. logger.warning( "Giving up on a notification to user %s, pushkey %s", self.user_id, self.pushkey, ) self.backoff_delay = HttpPusher.INITIAL_BACKOFF_SEC self.last_stream_ordering = push_action.stream_ordering await self.store.update_pusher_last_stream_ordering( self.app_id, self.pushkey, self.user_id, self.last_stream_ordering, ) self.failing_since = None await self.store.update_pusher_failing_since( self.app_id, self.pushkey, self.user_id, self.failing_since ) else: logger.info("Push failed: delaying for %ds", self.backoff_delay) self.timed_call = self.hs.get_reactor().callLater( self.backoff_delay, self.on_timer ) self.backoff_delay = min( self.backoff_delay * 2, self.MAX_BACKOFF_SEC ) break async def _process_one(self, push_action: HttpPushAction) -> bool: if "notify" not in push_action.actions: return True tweaks = tweaks_for_actions(push_action.actions) badge = await push_tools.get_badge_count( self.hs.get_datastores().main, self.user_id, group_by_room=self._group_unread_count_by_room, ) event = await self.store.get_event(push_action.event_id, allow_none=True) if event is None: return True # It's been redacted # Check if we should delay sending out the notification by a random # amount. # # Note: we base the delay off of when the event was sent, rather than # now, to handle the case where we need to send out many notifications # at once. If we just slept the random amount each loop then the last # push notification in the set could be delayed by many times the max # delay. if self.push_jitter_delay_ms: delay_ms = random.randint(1, self.push_jitter_delay_ms) diff_ms = event.origin_server_ts + delay_ms - self.clock.time_msec() if diff_ms > 0: await self.clock.sleep(diff_ms / 1000) rejected = await self.dispatch_push_event(event, tweaks, badge) if rejected is False: return False if isinstance(rejected, (list, tuple)): for pk in rejected: if pk != self.pushkey: # for sanity, we only remove the pushkey if it # was the one we actually sent... logger.warning( ("Ignoring rejected pushkey %s because we didn't send it"), pk, ) else: logger.info("Pushkey %s was rejected: removing", pk) await self._pusherpool.remove_pusher(self.app_id, pk, self.user_id) return True async def dispatch_push( self, content: JsonDict, tweaks: Optional[JsonMapping] = None, default_payload: Optional[JsonMapping] = None, ) -> Union[bool, List[str]]: """Send a notification to the registered push gateway, with `content` being the content of the `notification` top property specified in the spec. Note that the `devices` property will be added with device-specific information for this pusher. Args: content: the content tweaks: tweaks to add into the `devices` section default_payload: default payload to add in `devices[0].data.default_payload`. This will be merged (and override if some matching values already exist there) with existing `default_payload`. Returns: False if an error occured when calling the push gateway, or an array of rejected push keys otherwise. If this array is empty, the push fully succeeded. """ content = content.copy() data = self.data_minus_url.copy() if default_payload: data.setdefault("default_payload", {}).update(default_payload) device = { "app_id": self.app_id, "pushkey": self.pushkey, "pushkey_ts": int(self.pushkey_ts / 1000), "data": data, } if tweaks: device["tweaks"] = tweaks content["devices"] = [device] try: resp = await self.http_client.post_json_get_json( self.url, {"notification": content} ) except Exception as e: logger.warning( "Failed to push data to %s: %s %s", self.name, type(e), e, ) return False rejected = [] if "rejected" in resp: rejected = resp["rejected"] return rejected async def dispatch_push_event( self, event: EventBase, tweaks: JsonMapping, badge: int, ) -> Union[bool, List[str]]: """Send a notification to the registered push gateway by building it from an event. Args: event: the event tweaks: tweaks to add into the `devices` section, used to decide the push priority badge: unread count to send with the push notification Returns: False if an error occured when calling the push gateway, or an array of rejected push keys otherwise. If this array is empty, the push fully succeeded. """ priority = "low" if ( event.type == EventTypes.Encrypted or tweaks.get("highlight") or tweaks.get("sound") ): # HACK send our push as high priority only if it generates a sound, highlight # or may do so (i.e. is encrypted so has unknown effects). priority = "high" # This was checked in the __init__, but mypy doesn't seem to know that. assert self.data is not None if self.data.get("format") == "event_id_only": content: JsonDict = { "event_id": event.event_id, "room_id": event.room_id, "counts": {"unread": badge}, "prio": priority, } # event_id_only doesn't include the tweaks, so override them. tweaks = {} else: ctx = await push_tools.get_context_for_event( self._storage_controllers, event, self.user_id ) content = { "id": event.event_id, # deprecated: remove soon "event_id": event.event_id, "room_id": event.room_id, "type": event.type, "sender": event.user_id, "prio": priority, "counts": { "unread": badge, # 'missed_calls': 2 }, } if event.type == "m.room.member" and event.is_state(): content["membership"] = event.content["membership"] content["user_is_target"] = event.state_key == self.user_id if self.hs.config.push.push_include_content and event.content: content["content"] = event.content # We no longer send aliases separately, instead, we send the human # readable name of the room, which may be an alias. if "sender_display_name" in ctx and len(ctx["sender_display_name"]) > 0: content["sender_display_name"] = ctx["sender_display_name"] if "name" in ctx and len(ctx["name"]) > 0: content["room_name"] = ctx["name"] res = await self.dispatch_push(content, tweaks) # If the push is successful and none are rejected, update the badge count. if res is not False and not res: self.badge_count_last_call = badge return res async def _send_badge(self, badge: int) -> None: """ Args: badge: number of unread messages """ logger.debug("Sending updated badge count %d to %s", badge, self.name) d = { "notification": { "id": "", "type": None, "sender": "", "counts": {"unread": badge}, "devices": [ { "app_id": self.app_id, "pushkey": self.pushkey, "pushkey_ts": int(self.pushkey_ts / 1000), "data": self.data_minus_url, } ], } } try: await self.http_client.post_json_get_json(self.url, d) http_badges_processed_counter.inc() except Exception as e: logger.warning( "Failed to send badge count to %s: %s %s", self.name, type(e), e ) http_badges_failed_counter.inc()