532 lines
16 KiB
Python
532 lines
16 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.storage.presence import UserPresenceState
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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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from collections import namedtuple
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import logging
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logger = logging.getLogger(__name__)
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metrics = synapse.metrics.get_metrics_for(__name__)
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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.notifier = hs.get_notifier()
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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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self.notifier.on_new_replication_data()
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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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self.notifier.on_new_replication_data()
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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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self.notifier.on_new_replication_data()
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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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self.notifier.on_new_replication_data()
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def get_current_token(self):
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return self.pos - 1
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def federation_ack(self, token):
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self._clear_queue_before_pos(token)
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def get_replication_rows(self, from_token, to_token, limit, federation_ack=None):
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"""Get rows to be sent over federation between the two tokens
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Args:
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from_token (int)
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to_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 from_token > self.pos:
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from_token = -1
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# list of tuple(int, BaseFederationRow), where the first is the position
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# of the federation stream.
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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(from_token)
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j = keys.bisect_right(to_token) + 1
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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:j]
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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, PresenceRow(
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destination=dest,
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state=self.presence_map[user_id],
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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(from_token)
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j = keys.bisect_right(to_token) + 1
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keyed_edus = set((k, self.keyed_edu_changed[k]) for k in keys[i:j])
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for (pos, (destination, edu_key)) in keyed_edus:
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rows.append((pos, KeyedEduRow(
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key=edu_key,
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edu=self.keyed_edu[(destination, edu_key)],
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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(from_token)
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j = keys.bisect_right(to_token) + 1
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edus = set((k, self.edus[k]) for k in keys[i:j])
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for (pos, edu) in edus:
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rows.append((pos, EduRow(edu)))
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# Fetch changed failures
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keys = self.failures.keys()
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i = keys.bisect_right(from_token)
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j = keys.bisect_right(to_token) + 1
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failures = set((k, self.failures[k]) for k in keys[i:j])
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for (pos, (destination, failure)) in failures:
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rows.append((pos, FailureRow(
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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(from_token)
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j = keys.bisect_right(to_token) + 1
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device_messages = set((k, self.device_messages[k]) for k in keys[i:j])
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for (pos, destination) in device_messages:
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rows.append((pos, DeviceRow(
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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 [(pos, row.TypeId, row.to_data()) for pos, row in rows]
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class BaseFederationRow(object):
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"""Base class for rows to be sent in the federation stream.
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Specifies how to identify, serialize and deserialize the different types.
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"""
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TypeId = None # Unique string that ids the type. Must be overriden in sub classes.
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@staticmethod
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def from_data(data):
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"""Parse the data from the federation stream into a row.
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Args:
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data: The value of ``data`` from FederationStreamRow.data, type
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depends on the type of stream
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"""
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raise NotImplementedError()
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def to_data(self):
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"""Serialize this row to be sent over the federation stream.
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Returns:
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The value to be sent in FederationStreamRow.data. The type depends
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on the type of stream.
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"""
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raise NotImplementedError()
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def add_to_buffer(self, buff):
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"""Add this row to the appropriate field in the buffer ready for this
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to be sent over federation.
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We use a buffer so that we can batch up events that have come in at
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the same time and send them all at once.
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Args:
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buff (BufferedToSend)
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"""
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raise NotImplementedError()
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class PresenceRow(BaseFederationRow, namedtuple("PresenceRow", (
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"destination", # str
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"state", # UserPresenceState
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))):
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TypeId = "p"
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@staticmethod
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def from_data(data):
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return PresenceRow(
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destination=data["destination"],
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state=UserPresenceState.from_dict(data["state"])
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)
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def to_data(self):
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return {
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"destination": self.destination,
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"state": self.state.as_dict()
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}
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def add_to_buffer(self, buff):
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buff.presence.setdefault(self.destination, []).append(self.state)
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class KeyedEduRow(BaseFederationRow, namedtuple("KeyedEduRow", (
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"key", # tuple(str) - the edu key passed to send_edu
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"edu", # Edu
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))):
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TypeId = "k"
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@staticmethod
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def from_data(data):
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return KeyedEduRow(
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key=tuple(data["key"]),
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edu=Edu(**data["edu"]),
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)
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def to_data(self):
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return {
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"key": self.key,
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"edu": self.edu.get_internal_dict(),
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}
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def add_to_buffer(self, buff):
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buff.keyed_edus.setdefault(
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self.edu.destination, {}
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)[self.key] = self.edu
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class EduRow(BaseFederationRow, namedtuple("EduRow", (
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"edu", # Edu
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))):
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TypeId = "e"
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@staticmethod
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def from_data(data):
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return EduRow(Edu(**data))
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def to_data(self):
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return self.edu.get_internal_dict()
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def add_to_buffer(self, buff):
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buff.edus.setdefault(self.edu.destination, []).append(self.edu)
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class FailureRow(BaseFederationRow, namedtuple("FailureRow", (
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"destination", # str
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"failure",
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))):
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TypeId = "f"
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@staticmethod
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def from_data(data):
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return FailureRow(
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destination=data["destination"],
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failure=data["failure"],
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)
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def to_data(self):
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return {
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"destination": self.destination,
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"failure": self.failure,
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}
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def add_to_buffer(self, buff):
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buff.failures.setdefault(self.destination, []).append(self.failure)
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class DeviceRow(BaseFederationRow, namedtuple("DeviceRow", (
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"destination", # str
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))):
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TypeId = "d"
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@staticmethod
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def from_data(data):
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return DeviceRow(destination=data["destination"])
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def to_data(self):
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return {"destination": self.destination}
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def add_to_buffer(self, buff):
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buff.device_destinations.add(self.destination)
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TypeToRow = {
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Row.TypeId: Row
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for Row in (
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PresenceRow,
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KeyedEduRow,
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EduRow,
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FailureRow,
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DeviceRow,
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)
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}
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ParsedFederationStreamData = namedtuple("ParsedFederationStreamData", (
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"presence", # dict of destination -> [UserPresenceState]
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"keyed_edus", # dict of destination -> { key -> Edu }
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"edus", # dict of destination -> [Edu]
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"failures", # dict of destination -> [failures]
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"device_destinations", # set of destinations
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))
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def process_rows_for_federation(transaction_queue, rows):
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"""Parse a list of rows from the federation stream and put them in the
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transaction queue ready for sending to the relevant homeservers.
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Args:
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transaction_queue (TransactionQueue)
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rows (list(synapse.replication.tcp.streams.FederationStreamRow))
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"""
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# The federation stream contains a bunch of different types of
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# rows that need to be handled differently. We parse the rows, put
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# them into the appropriate collection and then send them off.
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buff = ParsedFederationStreamData(
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presence={},
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keyed_edus={},
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edus={},
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failures={},
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device_destinations=set(),
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)
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# Parse the rows in the stream and add to the buffer
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for row in rows:
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if row.type not in TypeToRow:
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logger.error("Unrecognized federation row type %r", row.type)
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continue
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RowType = TypeToRow[row.type]
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parsed_row = RowType.from_data(row.data)
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parsed_row.add_to_buffer(buff)
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for destination, states in buff.presence.iteritems():
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transaction_queue.send_presence(destination, states)
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for destination, edu_map in buff.keyed_edus.iteritems():
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for key, edu in edu_map.items():
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transaction_queue.send_edu(
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edu.destination, edu.edu_type, edu.content, key=key,
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)
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for destination, edu_list in buff.edus.iteritems():
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for edu in edu_list:
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transaction_queue.send_edu(
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edu.destination, edu.edu_type, edu.content, key=None,
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)
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for destination, failure_list in buff.failures.iteritems():
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for failure in failure_list:
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transaction_queue.send_failure(destination, failure)
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for destination in buff.device_destinations:
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transaction_queue.send_device_messages(destination)
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