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Add presence federation stream (#9819)

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Erik Johnston 2021-04-20 14:11:24 +01:00 • committed by GitHub
parent db70435de7
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6 changed files with 426 additions and 31 deletions
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243
synapse/handlers/presence.py
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@ -24,6 +24,7 @@ The methods that define policy are:
import abc
import contextlib
import logging
from bisect import bisect
from contextlib import contextmanager
from typing import (
TYPE_CHECKING,
@ -53,7 +54,9 @@ from synapse.replication.http.presence import (
ReplicationBumpPresenceActiveTime,
ReplicationPresenceSetState,
)
from synapse.replication.http.streams import ReplicationGetStreamUpdates
from synapse.replication.tcp.commands import ClearUserSyncsCommand
from synapse.replication.tcp.streams import PresenceFederationStream, PresenceStream
from synapse.state import StateHandler
from synapse.storage.databases.main import DataStore
from synapse.types import Collection, JsonDict, UserID, get_domain_from_id
@ -128,10 +131,10 @@ class BasePresenceHandler(abc.ABC):
self.is_mine_id = hs.is_mine_id
self._federation = None
if hs.should_send_federation() or not hs.config.worker_app:
if hs.should_send_federation():
self._federation = hs.get_federation_sender()
self._send_federation = hs.should_send_federation()
self._federation_queue = PresenceFederationQueue(hs, self)
self._busy_presence_enabled = hs.config.experimental.msc3026_enabled
@ -254,9 +257,17 @@ class BasePresenceHandler(abc.ABC):
"""
pass
async def process_replication_rows(self, token, rows):
"""Process presence stream rows received over replication."""
pass
async def process_replication_rows(
self, stream_name: str, instance_name: str, token: int, rows: list
):
"""Process streams received over replication."""
await self._federation_queue.process_replication_rows(
stream_name, instance_name, token, rows
)
def get_federation_queue(self) -> "PresenceFederationQueue":
"""Get the presence federation queue."""
return self._federation_queue
async def maybe_send_presence_to_interested_destinations(
self, states: List[UserPresenceState]
@ -266,12 +277,9 @@ class BasePresenceHandler(abc.ABC):
users.
"""
if not self._send_federation:
if not self._federation:
return
# If this worker sends federation we must have a FederationSender.
assert self._federation
states = [s for s in states if self.is_mine_id(s.user_id)]
if not states:
@ -427,7 +435,14 @@ class WorkerPresenceHandler(BasePresenceHandler):
# If this is a federation sender, notify about presence updates.
await self.maybe_send_presence_to_interested_destinations(states)
async def process_replication_rows(self, token, rows):
async def process_replication_rows(
self, stream_name: str, instance_name: str, token: int, rows: list
):
await super().process_replication_rows(stream_name, instance_name, token, rows)
if stream_name != PresenceStream.NAME:
return
states = [
UserPresenceState(
row.user_id,
@ -729,12 +744,10 @@ class PresenceHandler(BasePresenceHandler):
self.state,
)
# Since this is master we know that we have a federation sender or
# queue, and so this will be defined.
assert self._federation
for destinations, states in hosts_and_states:
self._federation.send_presence_to_destinations(states, destinations)
self._federation_queue.send_presence_to_destinations(
states, destinations
)
async def _handle_timeouts(self):
"""Checks the presence of users that have timed out and updates as
@ -1213,13 +1226,9 @@ class PresenceHandler(BasePresenceHandler):
user_presence_states
)
# Since this is master we know that we have a federation sender or
# queue, and so this will be defined.
assert self._federation
# Send out user presence updates for each destination
for destination, user_state_set in presence_destinations.items():
self._federation.send_presence_to_destinations(
self._federation_queue.send_presence_to_destinations(
destinations=[destination], states=user_state_set
)
@ -1864,3 +1873,197 @@ async def get_interested_remotes(
hosts_and_states.append(([host], states))
return hosts_and_states
class PresenceFederationQueue:
"""Handles sending ad hoc presence updates over federation, which are *not*
due to state updates (that get handled via the presence stream), e.g.
federation pings and sending existing present states to newly joined hosts.
Only the last N minutes will be queued, so if a federation sender instance
is down for longer then some updates will be dropped. This is OK as presence
is ephemeral, and so it will self correct eventually.
On workers the class tracks the last received position of the stream from
replication, and handles querying for missed updates over HTTP replication,
c.f. `get_current_token` and `get_replication_rows`.
"""
# How long to keep entries in the queue for. Workers that are down for
# longer than this duration will miss out on older updates.
_KEEP_ITEMS_IN_QUEUE_FOR_MS = 5 * 60 * 1000
# How often to check if we can expire entries from the queue.
_CLEAR_ITEMS_EVERY_MS = 60 * 1000
def __init__(self, hs: "HomeServer", presence_handler: BasePresenceHandler):
self._clock = hs.get_clock()
self._notifier = hs.get_notifier()
self._instance_name = hs.get_instance_name()
self._presence_handler = presence_handler
self._repl_client = ReplicationGetStreamUpdates.make_client(hs)
# Should we keep a queue of recent presence updates? We only bother if
# another process may be handling federation sending.
self._queue_presence_updates = True
# Whether this instance is a presence writer.
self._presence_writer = hs.config.worker.worker_app is None
# The FederationSender instance, if this process sends federation traffic directly.
self._federation = None
if hs.should_send_federation():
self._federation = hs.get_federation_sender()
# We don't bother queuing up presence states if only this instance
# is sending federation.
if hs.config.worker.federation_shard_config.instances == [
self._instance_name
]:
self._queue_presence_updates = False
# The queue of recently queued updates as tuples of: `(timestamp,
# stream_id, destinations, user_ids)`. We don't store the full states
# for efficiency, and remote workers will already have the full states
# cached.
self._queue = [] # type: List[Tuple[int, int, Collection[str], Set[str]]]
self._next_id = 1
# Map from instance name to current token
self._current_tokens = {} # type: Dict[str, int]
if self._queue_presence_updates:
self._clock.looping_call(self._clear_queue, self._CLEAR_ITEMS_EVERY_MS)
def _clear_queue(self):
"""Clear out older entries from the queue."""
clear_before = self._clock.time_msec() - self._KEEP_ITEMS_IN_QUEUE_FOR_MS
# The queue is sorted by timestamp, so we can bisect to find the right
# place to purge before. Note that we are searching using a 1-tuple with
# the time, which does The Right Thing since the queue is a tuple where
# the first item is a timestamp.
index = bisect(self._queue, (clear_before,))
self._queue = self._queue[index:]
def send_presence_to_destinations(
self, states: Collection[UserPresenceState], destinations: Collection[str]
) -> None:
"""Send the presence states to the given destinations.
Will forward to the local federation sender (if there is one) and queue
to send over replication (if there are other federation sender instances.).
Must only be called on the master process.
"""
# This should only be called on a presence writer.
assert self._presence_writer
if self._federation:
self._federation.send_presence_to_destinations(
states=states,
destinations=destinations,
)
if not self._queue_presence_updates:
return
now = self._clock.time_msec()
stream_id = self._next_id
self._next_id += 1
self._queue.append((now, stream_id, destinations, {s.user_id for s in states}))
self._notifier.notify_replication()
def get_current_token(self, instance_name: str) -> int:
"""Get the current position of the stream.
On workers this returns the last stream ID received from replication.
"""
if instance_name == self._instance_name:
return self._next_id - 1
else:
return self._current_tokens.get(instance_name, 0)
async def get_replication_rows(
self,
instance_name: str,
from_token: int,
upto_token: int,
target_row_count: int,
) -> Tuple[List[Tuple[int, Tuple[str, str]]], int, bool]:
"""Get all the updates between the two tokens.
We return rows in the form of `(destination, user_id)` to keep the size
of each row bounded (rather than returning the sets in a row).
On workers this will query the master process via HTTP replication.
"""
if instance_name != self._instance_name:
# If not local we query over http replication from the master
result = await self._repl_client(
instance_name=instance_name,
stream_name=PresenceFederationStream.NAME,
from_token=from_token,
upto_token=upto_token,
)
return result["updates"], result["upto_token"], result["limited"]
# We can find the correct position in the queue by noting that there is
# exactly one entry per stream ID, and that the last entry has an ID of
# `self._next_id - 1`, so we can count backwards from the end.
#
# Since the start of the queue is periodically truncated we need to
# handle the case where `from_token` stream ID has already been dropped.
start_idx = max(from_token - self._next_id, -len(self._queue))
to_send = [] # type: List[Tuple[int, Tuple[str, str]]]
limited = False
new_id = upto_token
for _, stream_id, destinations, user_ids in self._queue[start_idx:]:
if stream_id > upto_token:
break
new_id = stream_id
to_send.extend(
(stream_id, (destination, user_id))
for destination in destinations
for user_id in user_ids
)
if len(to_send) > target_row_count:
limited = True
break
return to_send, new_id, limited
async def process_replication_rows(
self, stream_name: str, instance_name: str, token: int, rows: list
):
if stream_name != PresenceFederationStream.NAME:
return
# We keep track of the current tokens (so that we can catch up with anything we missed after a disconnect)
self._current_tokens[instance_name] = token
# If we're a federation sender we pull out the presence states to send
# and forward them on.
if not self._federation:
return
hosts_to_users = {} # type: Dict[str, Set[str]]
for row in rows:
hosts_to_users.setdefault(row.destination, set()).add(row.user_id)
for host, user_ids in hosts_to_users.items():
states = await self._presence_handler.current_state_for_users(user_ids)
self._federation.send_presence_to_destinations(
states=states.values(),
destinations=[host],
)