forked-synapse/synapse/federation/send_queue.py

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# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
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"""A federation sender that forwards things to be sent across replication to
a worker process.
It assumes there is a single worker process feeding off of it.
Each row in the replication stream consists of a type and some json, where the
types indicate whether they are presence, or edus, etc.
Ephemeral or non-event data are queued up in-memory. When the worker requests
updates since a particular point, all in-memory data since before that point is
dropped. We also expire things in the queue after 5 minutes, to ensure that a
dead worker doesn't cause the queues to grow limitlessly.
Events are replicated via a separate events stream.
"""
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import logging
from collections import namedtuple
from six import iteritems
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from sortedcontainers import SortedDict
from twisted.internet import defer
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from synapse.metrics import LaterGauge
from synapse.storage.presence import UserPresenceState
from synapse.util.metrics import Measure
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from .units import Edu
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logger = logging.getLogger(__name__)
class FederationRemoteSendQueue(object):
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"""A drop in replacement for FederationSender"""
def __init__(self, hs):
self.server_name = hs.hostname
self.clock = hs.get_clock()
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self.notifier = hs.get_notifier()
self.is_mine_id = hs.is_mine_id
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self.presence_map = {} # Pending presence map user_id -> UserPresenceState
self.presence_changed = SortedDict() # Stream position -> list[user_id]
# Stores the destinations we need to explicitly send presence to about a
# given user.
# Stream position -> (user_id, destinations)
self.presence_destinations = SortedDict()
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self.keyed_edu = {} # (destination, key) -> EDU
self.keyed_edu_changed = SortedDict() # stream position -> (destination, key)
self.edus = SortedDict() # stream position -> Edu
self.pos = 1
self.pos_time = SortedDict()
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# EVERYTHING IS SAD. In particular, python only makes new scopes when
# 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
# changes. ARGH.
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def register(name, queue):
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LaterGauge(
"synapse_federation_send_queue_%s_size" % (queue_name,),
"",
[],
lambda: len(queue),
)
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for queue_name in [
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"presence_map",
"presence_changed",
"keyed_edu",
"keyed_edu_changed",
"edus",
"pos_time",
"presence_destinations",
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]:
register(queue_name, getattr(self, queue_name))
self.clock.looping_call(self._clear_queue, 30 * 1000)
def _next_pos(self):
pos = self.pos
self.pos += 1
self.pos_time[self.clock.time_msec()] = pos
return pos
def _clear_queue(self):
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"""Clear the queues for anything older than N minutes"""
FIVE_MINUTES_AGO = 5 * 60 * 1000
now = self.clock.time_msec()
keys = self.pos_time.keys()
time = self.pos_time.bisect_left(now - FIVE_MINUTES_AGO)
if not keys[:time]:
return
position_to_delete = max(keys[:time])
for key in keys[:time]:
del self.pos_time[key]
self._clear_queue_before_pos(position_to_delete)
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"):
# Delete things out of presence maps
keys = self.presence_changed.keys()
i = self.presence_changed.bisect_left(position_to_delete)
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for key in keys[:i]:
del self.presence_changed[key]
user_ids = {
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user_id for uids in self.presence_changed.values() for user_id in uids
}
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keys = self.presence_destinations.keys()
i = self.presence_destinations.bisect_left(position_to_delete)
for key in keys[:i]:
del self.presence_destinations[key]
user_ids.update(
user_id for user_id, _ in self.presence_destinations.values()
)
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to_del = [
user_id for user_id in self.presence_map if user_id not in user_ids
]
for user_id in to_del:
del self.presence_map[user_id]
# Delete things out of keyed edus
keys = self.keyed_edu_changed.keys()
i = self.keyed_edu_changed.bisect_left(position_to_delete)
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for key in keys[:i]:
del self.keyed_edu_changed[key]
live_keys = set()
for edu_key in self.keyed_edu_changed.values():
live_keys.add(edu_key)
to_del = [edu_key for edu_key in self.keyed_edu if edu_key not in live_keys]
for edu_key in to_del:
del self.keyed_edu[edu_key]
# Delete things out of edu map
keys = self.edus.keys()
i = self.edus.bisect_left(position_to_delete)
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for key in keys[:i]:
del self.edus[key]
def notify_new_events(self, current_id):
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"""As per FederationSender"""
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# We don't need to replicate this as it gets sent down a different
# stream.
pass
def build_and_send_edu(self, destination, edu_type, content, key=None):
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"""As per FederationSender"""
if destination == self.server_name:
logger.info("Not sending EDU to ourselves")
return
pos = self._next_pos()
edu = Edu(
origin=self.server_name,
destination=destination,
edu_type=edu_type,
content=content,
)
if key:
assert isinstance(key, tuple)
self.keyed_edu[(destination, key)] = edu
self.keyed_edu_changed[pos] = (destination, key)
else:
self.edus[pos] = edu
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self.notifier.on_new_replication_data()
def send_read_receipt(self, receipt):
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"""As per FederationSender
Args:
receipt (synapse.types.ReadReceipt):
"""
# nothing to do here: the replication listener will handle it.
return defer.succeed(None)
def send_presence(self, states):
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"""As per FederationSender
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Args:
states (list(UserPresenceState))
"""
pos = self._next_pos()
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# We only want to send presence for our own users, so lets always just
# filter here just in case.
local_states = list(filter(lambda s: self.is_mine_id(s.user_id), states))
self.presence_map.update({state.user_id: state for state in local_states})
self.presence_changed[pos] = [state.user_id for state in local_states]
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self.notifier.on_new_replication_data()
def send_presence_to_destinations(self, states, destinations):
"""As per FederationSender
Args:
states (list[UserPresenceState])
destinations (list[str])
"""
for state in states:
pos = self._next_pos()
self.presence_map.update({state.user_id: state for state in states})
self.presence_destinations[pos] = (state.user_id, destinations)
self.notifier.on_new_replication_data()
def send_device_messages(self, destination):
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"""As per FederationSender"""
# We don't need to replicate this as it gets sent down a different
# stream.
def get_current_token(self):
return self.pos - 1
def federation_ack(self, token):
self._clear_queue_before_pos(token)
async def get_replication_rows(
self, from_token, to_token, limit, federation_ack=None
):
"""Get rows to be sent over federation between the two tokens
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Args:
from_token (int)
to_token(int)
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limit (int)
federation_ack (int): Optional. The position where the worker is
explicitly acknowledged it has handled. Allows us to drop
data from before that point
"""
# TODO: Handle limit.
# To handle restarts where we wrap around
if from_token > self.pos:
from_token = -1
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# list of tuple(int, BaseFederationRow), where the first is the position
# of the federation stream.
rows = []
# There should be only one reader, so lets delete everything its
# acknowledged its seen.
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if federation_ack:
self._clear_queue_before_pos(federation_ack)
# Fetch changed presence
i = self.presence_changed.bisect_right(from_token)
j = self.presence_changed.bisect_right(to_token) + 1
dest_user_ids = [
(pos, user_id)
for pos, user_id_list in self.presence_changed.items()[i:j]
for user_id in user_id_list
]
for (key, user_id) in dest_user_ids:
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rows.append((key, PresenceRow(state=self.presence_map[user_id])))
# Fetch presence to send to destinations
i = self.presence_destinations.bisect_right(from_token)
j = self.presence_destinations.bisect_right(to_token) + 1
for pos, (user_id, dests) in self.presence_destinations.items()[i:j]:
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rows.append(
(
pos,
PresenceDestinationsRow(
state=self.presence_map[user_id], destinations=list(dests)
),
)
)
# Fetch changes keyed edus
i = self.keyed_edu_changed.bisect_right(from_token)
j = self.keyed_edu_changed.bisect_right(to_token) + 1
# We purposefully clobber based on the key here, python dict comprehensions
# always use the last value, so this will correctly point to the last
# stream position.
keyed_edus = {v: k for k, v in self.keyed_edu_changed.items()[i:j]}
for ((destination, edu_key), pos) in iteritems(keyed_edus):
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rows.append(
(
pos,
KeyedEduRow(
key=edu_key, edu=self.keyed_edu[(destination, edu_key)]
),
)
)
# Fetch changed edus
i = self.edus.bisect_right(from_token)
j = self.edus.bisect_right(to_token) + 1
edus = self.edus.items()[i:j]
for (pos, edu) in edus:
rows.append((pos, EduRow(edu)))
# Sort rows based on pos
rows.sort()
return [(pos, row.TypeId, row.to_data()) for pos, row in rows]
class BaseFederationRow(object):
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"""Base class for rows to be sent in the federation stream.
Specifies how to identify, serialize and deserialize the different types.
"""
TypeId = None # Unique string that ids the type. Must be overriden in sub classes.
@staticmethod
def from_data(data):
"""Parse the data from the federation stream into a row.
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Args:
data: The value of ``data`` from FederationStreamRow.data, type
depends on the type of stream
"""
raise NotImplementedError()
def to_data(self):
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"""Serialize this row to be sent over the federation stream.
Returns:
The value to be sent in FederationStreamRow.data. The type depends
on the type of stream.
"""
raise NotImplementedError()
def add_to_buffer(self, buff):
"""Add this row to the appropriate field in the buffer ready for this
to be sent over federation.
We use a buffer so that we can batch up events that have come in at
the same time and send them all at once.
Args:
buff (BufferedToSend)
"""
raise NotImplementedError()
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class PresenceRow(
BaseFederationRow, namedtuple("PresenceRow", ("state",)) # UserPresenceState
):
TypeId = "p"
@staticmethod
def from_data(data):
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return PresenceRow(state=UserPresenceState.from_dict(data))
def to_data(self):
return self.state.as_dict()
def add_to_buffer(self, buff):
buff.presence.append(self.state)
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class PresenceDestinationsRow(
BaseFederationRow,
namedtuple(
"PresenceDestinationsRow",
("state", "destinations"), # UserPresenceState # list[str]
),
):
TypeId = "pd"
@staticmethod
def from_data(data):
return PresenceDestinationsRow(
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state=UserPresenceState.from_dict(data["state"]), destinations=data["dests"]
)
def to_data(self):
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return {"state": self.state.as_dict(), "dests": self.destinations}
def add_to_buffer(self, buff):
buff.presence_destinations.append((self.state, self.destinations))
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class KeyedEduRow(
BaseFederationRow,
namedtuple(
"KeyedEduRow",
("key", "edu"), # tuple(str) - the edu key passed to send_edu # Edu
),
):
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"""Streams EDUs that have an associated key that is ued to clobber. For example,
typing EDUs clobber based on room_id.
"""
TypeId = "k"
@staticmethod
def from_data(data):
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return KeyedEduRow(key=tuple(data["key"]), edu=Edu(**data["edu"]))
def to_data(self):
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return {"key": self.key, "edu": self.edu.get_internal_dict()}
def add_to_buffer(self, buff):
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buff.keyed_edus.setdefault(self.edu.destination, {})[self.key] = self.edu
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class EduRow(BaseFederationRow, namedtuple("EduRow", ("edu",))): # Edu
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"""Streams EDUs that don't have keys. See KeyedEduRow
"""
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TypeId = "e"
@staticmethod
def from_data(data):
return EduRow(Edu(**data))
def to_data(self):
return self.edu.get_internal_dict()
def add_to_buffer(self, buff):
buff.edus.setdefault(self.edu.destination, []).append(self.edu)
TypeToRow = {
Row.TypeId: Row
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for Row in (PresenceRow, PresenceDestinationsRow, KeyedEduRow, EduRow,)
}
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ParsedFederationStreamData = namedtuple(
"ParsedFederationStreamData",
(
"presence", # list(UserPresenceState)
"presence_destinations", # list of tuples of UserPresenceState and destinations
"keyed_edus", # dict of destination -> { key -> Edu }
"edus", # dict of destination -> [Edu]
),
)
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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
transaction queue ready for sending to the relevant homeservers.
Args:
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transaction_queue (FederationSender)
rows (list(synapse.replication.tcp.streams.federation.FederationStream.FederationStreamRow))
"""
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# The federation stream contains a bunch of different types of
# rows that need to be handled differently. We parse the rows, put
# them into the appropriate collection and then send them off.
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buff = ParsedFederationStreamData(
presence=[], presence_destinations=[], keyed_edus={}, edus={},
)
# Parse the rows in the stream and add to the buffer
for row in rows:
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if row.type not in TypeToRow:
logger.error("Unrecognized federation row type %r", row.type)
continue
RowType = TypeToRow[row.type]
parsed_row = RowType.from_data(row.data)
parsed_row.add_to_buffer(buff)
if buff.presence:
transaction_queue.send_presence(buff.presence)
for state, destinations in buff.presence_destinations:
transaction_queue.send_presence_to_destinations(
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states=[state], destinations=destinations
)
for destination, edu_map in iteritems(buff.keyed_edus):
for key, edu in edu_map.items():
transaction_queue.send_edu(edu, key)
for destination, edu_list in iteritems(buff.edus):
for edu in edu_list:
transaction_queue.send_edu(edu, None)