mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
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299 lines
9.4 KiB
Python
299 lines
9.4 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 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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"""A federation sender that forwards things to be sent across replication to
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a worker process.
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It assumes there is a single worker process feeding off of it.
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Each row in the replication stream consists of a type and some json, where the
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types indicate whether they are presence, or edus, etc.
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Ephemeral or non-event data are queued up in-memory. When the worker requests
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updates since a particular point, all in-memory data since before that point is
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dropped. We also expire things in the queue after 5 minutes, to ensure that a
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dead worker doesn't cause the queues to grow limitlessly.
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Events are replicated via a separate events stream.
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"""
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from .units import Edu
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from synapse.util.metrics import Measure
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import synapse.metrics
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from blist import sorteddict
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import ujson
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metrics = synapse.metrics.get_metrics_for(__name__)
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PRESENCE_TYPE = "p"
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KEYED_EDU_TYPE = "k"
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EDU_TYPE = "e"
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FAILURE_TYPE = "f"
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DEVICE_MESSAGE_TYPE = "d"
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class FederationRemoteSendQueue(object):
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"""A drop in replacement for TransactionQueue"""
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def __init__(self, hs):
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self.server_name = hs.hostname
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self.clock = hs.get_clock()
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self.presence_map = {}
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self.presence_changed = sorteddict()
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self.keyed_edu = {}
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self.keyed_edu_changed = sorteddict()
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self.edus = sorteddict()
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self.failures = sorteddict()
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self.device_messages = sorteddict()
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self.pos = 1
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self.pos_time = sorteddict()
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# EVERYTHING IS SAD. In particular, python only makes new scopes when
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# we make a new function, so we need to make a new function so the inner
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# lambda binds to the queue rather than to the name of the queue which
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# changes. ARGH.
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def register(name, queue):
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metrics.register_callback(
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queue_name + "_size",
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lambda: len(queue),
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)
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for queue_name in [
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"presence_map", "presence_changed", "keyed_edu", "keyed_edu_changed",
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"edus", "failures", "device_messages", "pos_time",
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]:
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register(queue_name, getattr(self, queue_name))
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self.clock.looping_call(self._clear_queue, 30 * 1000)
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def _next_pos(self):
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pos = self.pos
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self.pos += 1
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self.pos_time[self.clock.time_msec()] = pos
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return pos
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def _clear_queue(self):
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"""Clear the queues for anything older than N minutes"""
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FIVE_MINUTES_AGO = 5 * 60 * 1000
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now = self.clock.time_msec()
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keys = self.pos_time.keys()
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time = keys.bisect_left(now - FIVE_MINUTES_AGO)
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if not keys[:time]:
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return
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position_to_delete = max(keys[:time])
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for key in keys[:time]:
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del self.pos_time[key]
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self._clear_queue_before_pos(position_to_delete)
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def _clear_queue_before_pos(self, position_to_delete):
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"""Clear all the queues from before a given position"""
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with Measure(self.clock, "send_queue._clear"):
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# Delete things out of presence maps
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keys = self.presence_changed.keys()
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i = keys.bisect_left(position_to_delete)
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for key in keys[:i]:
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del self.presence_changed[key]
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user_ids = set(
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user_id for uids in self.presence_changed.values() for _, user_id in uids
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)
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to_del = [
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user_id for user_id in self.presence_map if user_id not in user_ids
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]
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for user_id in to_del:
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del self.presence_map[user_id]
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# Delete things out of keyed edus
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keys = self.keyed_edu_changed.keys()
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i = keys.bisect_left(position_to_delete)
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for key in keys[:i]:
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del self.keyed_edu_changed[key]
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live_keys = set()
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for edu_key in self.keyed_edu_changed.values():
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live_keys.add(edu_key)
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to_del = [edu_key for edu_key in self.keyed_edu if edu_key not in live_keys]
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for edu_key in to_del:
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del self.keyed_edu[edu_key]
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# Delete things out of edu map
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keys = self.edus.keys()
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i = keys.bisect_left(position_to_delete)
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for key in keys[:i]:
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del self.edus[key]
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# Delete things out of failure map
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keys = self.failures.keys()
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i = keys.bisect_left(position_to_delete)
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for key in keys[:i]:
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del self.failures[key]
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# Delete things out of device map
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keys = self.device_messages.keys()
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i = keys.bisect_left(position_to_delete)
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for key in keys[:i]:
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del self.device_messages[key]
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def notify_new_events(self, current_id):
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"""As per TransactionQueue"""
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# We don't need to replicate this as it gets sent down a different
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# stream.
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pass
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def send_edu(self, destination, edu_type, content, key=None):
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"""As per TransactionQueue"""
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pos = self._next_pos()
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edu = Edu(
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origin=self.server_name,
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destination=destination,
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edu_type=edu_type,
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content=content,
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)
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if key:
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assert isinstance(key, tuple)
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self.keyed_edu[(destination, key)] = edu
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self.keyed_edu_changed[pos] = (destination, key)
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else:
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self.edus[pos] = edu
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def send_presence(self, destination, states):
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"""As per TransactionQueue"""
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pos = self._next_pos()
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self.presence_map.update({
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state.user_id: state
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for state in states
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})
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self.presence_changed[pos] = [
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(destination, state.user_id) for state in states
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]
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def send_failure(self, failure, destination):
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"""As per TransactionQueue"""
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pos = self._next_pos()
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self.failures[pos] = (destination, str(failure))
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def send_device_messages(self, destination):
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"""As per TransactionQueue"""
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pos = self._next_pos()
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self.device_messages[pos] = destination
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def get_current_token(self):
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return self.pos - 1
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def get_replication_rows(self, token, limit, federation_ack=None):
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"""
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Args:
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token (int)
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limit (int)
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federation_ack (int): Optional. The position where the worker is
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explicitly acknowledged it has handled. Allows us to drop
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data from before that point
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"""
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# TODO: Handle limit.
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# To handle restarts where we wrap around
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if token > self.pos:
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token = -1
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rows = []
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# There should be only one reader, so lets delete everything its
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# acknowledged its seen.
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if federation_ack:
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self._clear_queue_before_pos(federation_ack)
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# Fetch changed presence
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keys = self.presence_changed.keys()
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i = keys.bisect_right(token)
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dest_user_ids = set(
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(pos, dest_user_id)
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for pos in keys[i:]
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for dest_user_id in self.presence_changed[pos]
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)
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for (key, (dest, user_id)) in dest_user_ids:
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rows.append((key, PRESENCE_TYPE, ujson.dumps({
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"destination": dest,
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"state": self.presence_map[user_id].as_dict(),
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})))
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# Fetch changes keyed edus
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keys = self.keyed_edu_changed.keys()
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i = keys.bisect_right(token)
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keyed_edus = set((k, self.keyed_edu_changed[k]) for k in keys[i:])
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for (pos, (destination, edu_key)) in keyed_edus:
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rows.append(
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(pos, KEYED_EDU_TYPE, ujson.dumps({
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"key": edu_key,
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"edu": self.keyed_edu[(destination, edu_key)].get_internal_dict(),
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}))
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)
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# Fetch changed edus
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keys = self.edus.keys()
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i = keys.bisect_right(token)
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edus = set((k, self.edus[k]) for k in keys[i:])
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for (pos, edu) in edus:
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rows.append((pos, EDU_TYPE, ujson.dumps(edu.get_internal_dict())))
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# Fetch changed failures
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keys = self.failures.keys()
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i = keys.bisect_right(token)
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failures = set((k, self.failures[k]) for k in keys[i:])
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for (pos, (destination, failure)) in failures:
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rows.append((pos, FAILURE_TYPE, ujson.dumps({
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"destination": destination,
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"failure": failure,
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})))
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# Fetch changed device messages
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keys = self.device_messages.keys()
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i = keys.bisect_right(token)
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device_messages = set((k, self.device_messages[k]) for k in keys[i:])
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for (pos, destination) in device_messages:
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rows.append((pos, DEVICE_MESSAGE_TYPE, ujson.dumps({
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"destination": destination,
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})))
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# Sort rows based on pos
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rows.sort()
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return rows
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