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