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synapse-old/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.
"""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.
"""
from .units import Edu
from synapse.util.metrics import Measure
import synapse.metrics
from blist import sorteddict
import ujson
metrics = synapse.metrics.get_metrics_for(__name__)
PRESENCE_TYPE = "p"
KEYED_EDU_TYPE = "k"
EDU_TYPE = "e"
FAILURE_TYPE = "f"
DEVICE_MESSAGE_TYPE = "d"
class FederationRemoteSendQueue(object):
"""A drop in replacement for TransactionQueue"""
def __init__(self, hs):
self.server_name = hs.hostname
self.clock = hs.get_clock()
self.presence_map = {}
self.presence_changed = sorteddict()
self.keyed_edu = {}
self.keyed_edu_changed = sorteddict()
self.edus = sorteddict()
self.failures = sorteddict()
self.device_messages = sorteddict()
self.pos = 1
self.pos_time = sorteddict()
# 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
# lambda binds to the queue rather than to the name of the queue which
# changes. ARGH.
def register(name, queue):
metrics.register_callback(
queue_name + "_size",
lambda: len(queue),
)
for queue_name in [
"presence_map", "presence_changed", "keyed_edu", "keyed_edu_changed",
"edus", "failures", "device_messages", "pos_time",
]:
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):
"""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 = keys.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):
"""Clear all the queues from before a given position"""
with Measure(self.clock, "send_queue._clear"):
# Delete things out of presence maps
keys = self.presence_changed.keys()
i = keys.bisect_left(position_to_delete)
for key in keys[:i]:
del self.presence_changed[key]
user_ids = set(
user_id for uids in self.presence_changed.values() for _, user_id in uids
)
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 = keys.bisect_left(position_to_delete)
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 = keys.bisect_left(position_to_delete)
for key in keys[:i]:
del self.edus[key]
# Delete things out of failure map
keys = self.failures.keys()
i = keys.bisect_left(position_to_delete)
for key in keys[:i]:
del self.failures[key]
# Delete things out of device map
keys = self.device_messages.keys()
i = keys.bisect_left(position_to_delete)
for key in keys[:i]:
del self.device_messages[key]
def notify_new_events(self, current_id):
"""As per TransactionQueue"""
# We don't need to replicate this as it gets sent down a different
# stream.
pass
def send_edu(self, destination, edu_type, content, key=None):
"""As per TransactionQueue"""
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
def send_presence(self, destination, states):
"""As per TransactionQueue"""
pos = self._next_pos()
self.presence_map.update({
state.user_id: state
for state in states
})
self.presence_changed[pos] = [
(destination, state.user_id) for state in states
]
def send_failure(self, failure, destination):
"""As per TransactionQueue"""
pos = self._next_pos()
self.failures[pos] = (destination, str(failure))
def send_device_messages(self, destination):
"""As per TransactionQueue"""
pos = self._next_pos()
self.device_messages[pos] = destination
def get_current_token(self):
return self.pos - 1
def get_replication_rows(self, token, limit, federation_ack=None):
"""
Args:
token (int)
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 token > self.pos:
token = -1
rows = []
# There should be only one reader, so lets delete everything its
# acknowledged its seen.
if federation_ack:
self._clear_queue_before_pos(federation_ack)
# Fetch changed presence
keys = self.presence_changed.keys()
i = keys.bisect_right(token)
dest_user_ids = set(
(pos, dest_user_id)
for pos in keys[i:]
for dest_user_id in self.presence_changed[pos]
)
for (key, (dest, user_id)) in dest_user_ids:
rows.append((key, PRESENCE_TYPE, ujson.dumps({
"destination": dest,
"state": self.presence_map[user_id].as_dict(),
})))
# Fetch changes keyed edus
keys = self.keyed_edu_changed.keys()
i = keys.bisect_right(token)
keyed_edus = set((k, self.keyed_edu_changed[k]) for k in keys[i:])
for (pos, (destination, edu_key)) in keyed_edus:
rows.append(
(pos, KEYED_EDU_TYPE, ujson.dumps({
"key": edu_key,
"edu": self.keyed_edu[(destination, edu_key)].get_internal_dict(),
}))
)
# Fetch changed edus
keys = self.edus.keys()
i = keys.bisect_right(token)
edus = set((k, self.edus[k]) for k in keys[i:])
for (pos, edu) in edus:
rows.append((pos, EDU_TYPE, ujson.dumps(edu.get_internal_dict())))
# Fetch changed failures
keys = self.failures.keys()
i = keys.bisect_right(token)
failures = set((k, self.failures[k]) for k in keys[i:])
for (pos, (destination, failure)) in failures:
rows.append((pos, FAILURE_TYPE, ujson.dumps({
"destination": destination,
"failure": failure,
})))
# Fetch changed device messages
keys = self.device_messages.keys()
i = keys.bisect_right(token)
device_messages = set((k, self.device_messages[k]) for k in keys[i:])
for (pos, destination) in device_messages:
rows.append((pos, DEVICE_MESSAGE_TYPE, ujson.dumps({
"destination": destination,
})))
# Sort rows based on pos
rows.sort()
return rows
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