anonymousland-synapse/synapse/federation/transaction_queue.py

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# -*- coding: utf-8 -*-
# Copyright 2014, 2015 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.
from twisted.internet import defer
from .persistence import TransactionActions
from .units import Transaction
from synapse.api.errors import HttpResponseException
from synapse.util.logutils import log_function
from synapse.util.logcontext import PreserveLoggingContext
import logging
logger = logging.getLogger(__name__)
class TransactionQueue(object):
"""This class makes sure we only have one transaction in flight at
a time for a given destination.
It batches pending PDUs into single transactions.
"""
def __init__(self, hs, transport_layer):
self.server_name = hs.hostname
self.store = hs.get_datastore()
self.transaction_actions = TransactionActions(self.store)
self.transport_layer = transport_layer
self._clock = hs.get_clock()
# Is a mapping from destinations -> deferreds. Used to keep track
# of which destinations have transactions in flight and when they are
# done
self.pending_transactions = {}
# Is a mapping from destination -> list of
# tuple(pending pdus, deferred, order)
self.pending_pdus_by_dest = {}
# destination -> list of tuple(edu, deferred)
self.pending_edus_by_dest = {}
# destination -> list of tuple(failure, deferred)
self.pending_failures_by_dest = {}
# HACK to get unique tx id
self._next_txn_id = int(self._clock.time_msec())
@defer.inlineCallbacks
@log_function
def enqueue_pdu(self, pdu, destinations, order):
# We loop through all destinations to see whether we already have
# a transaction in progress. If we do, stick it in the pending_pdus
# table and we'll get back to it later.
destinations = set(destinations)
destinations.discard(self.server_name)
destinations.discard("localhost")
logger.debug("Sending to: %s", str(destinations))
if not destinations:
return
deferreds = []
for destination in destinations:
deferred = defer.Deferred()
self.pending_pdus_by_dest.setdefault(destination, []).append(
(pdu, deferred, order)
)
def eb(failure):
if not deferred.called:
deferred.errback(failure)
else:
logger.warn("Failed to send pdu", failure)
with PreserveLoggingContext():
self._attempt_new_transaction(destination).addErrback(eb)
deferreds.append(deferred)
yield defer.DeferredList(deferreds)
# NO inlineCallbacks
def enqueue_edu(self, edu):
destination = edu.destination
if destination == self.server_name:
return
deferred = defer.Deferred()
self.pending_edus_by_dest.setdefault(destination, []).append(
(edu, deferred)
)
def eb(failure):
if not deferred.called:
deferred.errback(failure)
else:
logger.warn("Failed to send edu", failure)
with PreserveLoggingContext():
self._attempt_new_transaction(destination).addErrback(eb)
return deferred
@defer.inlineCallbacks
def enqueue_failure(self, failure, destination):
deferred = defer.Deferred()
self.pending_failures_by_dest.setdefault(
destination, []
).append(
(failure, deferred)
)
yield deferred
@defer.inlineCallbacks
@log_function
def _attempt_new_transaction(self, destination):
(retry_last_ts, retry_interval) = (0, 0)
retry_timings = yield self.store.get_destination_retry_timings(
destination
)
if retry_timings:
(retry_last_ts, retry_interval) = (
retry_timings.retry_last_ts, retry_timings.retry_interval
)
if retry_last_ts + retry_interval > int(self._clock.time_msec()):
logger.info(
"TX [%s] not ready for retry yet - "
"dropping transaction for now",
destination,
)
return
else:
logger.info("TX [%s] is ready for retry", destination)
if destination in self.pending_transactions:
# XXX: pending_transactions can get stuck on by a never-ending
# request at which point pending_pdus_by_dest just keeps growing.
# we need application-layer timeouts of some flavour of these
# requests
logger.info(
"TX [%s] Transaction already in progress",
destination
)
return
logger.info("TX [%s] _attempt_new_transaction", destination)
# list of (pending_pdu, deferred, order)
pending_pdus = self.pending_pdus_by_dest.pop(destination, [])
pending_edus = self.pending_edus_by_dest.pop(destination, [])
pending_failures = self.pending_failures_by_dest.pop(destination, [])
if pending_pdus:
logger.info("TX [%s] len(pending_pdus_by_dest[dest]) = %d",
destination, len(pending_pdus))
if not pending_pdus and not pending_edus and not pending_failures:
logger.info("TX [%s] Nothing to send", destination)
return
logger.debug(
"TX [%s] Attempting new transaction"
" (pdus: %d, edus: %d, failures: %d)",
destination,
len(pending_pdus),
len(pending_edus),
len(pending_failures)
)
# Sort based on the order field
pending_pdus.sort(key=lambda t: t[2])
pdus = [x[0] for x in pending_pdus]
edus = [x[0] for x in pending_edus]
failures = [x[0].get_dict() for x in pending_failures]
deferreds = [
x[1]
for x in pending_pdus + pending_edus + pending_failures
]
try:
self.pending_transactions[destination] = 1
logger.debug("TX [%s] Persisting transaction...", destination)
transaction = Transaction.create_new(
origin_server_ts=int(self._clock.time_msec()),
transaction_id=str(self._next_txn_id),
origin=self.server_name,
destination=destination,
pdus=pdus,
edus=edus,
pdu_failures=failures,
)
self._next_txn_id += 1
yield self.transaction_actions.prepare_to_send(transaction)
logger.debug("TX [%s] Persisted transaction", destination)
logger.info(
"TX [%s] Sending transaction [%s]",
destination,
transaction.transaction_id,
)
# Actually send the transaction
# FIXME (erikj): This is a bit of a hack to make the Pdu age
# keys work
def json_data_cb():
data = transaction.get_dict()
now = int(self._clock.time_msec())
if "pdus" in data:
for p in data["pdus"]:
if "age_ts" in p:
unsigned = p.setdefault("unsigned", {})
unsigned["age"] = now - int(p["age_ts"])
del p["age_ts"]
return data
try:
response = yield self.transport_layer.send_transaction(
transaction, json_data_cb
)
code = 200
except HttpResponseException as e:
code = e.code
response = e.response
logger.info("TX [%s] got %d response", destination, code)
logger.debug("TX [%s] Sent transaction", destination)
logger.debug("TX [%s] Marking as delivered...", destination)
yield self.transaction_actions.delivered(
transaction, code, response
)
logger.debug("TX [%s] Marked as delivered", destination)
logger.debug("TX [%s] Yielding to callbacks...", destination)
for deferred in deferreds:
if code == 200:
if retry_last_ts:
# this host is alive! reset retry schedule
yield self.store.set_destination_retry_timings(
destination, 0, 0
)
deferred.callback(None)
else:
self.set_retrying(destination, retry_interval)
deferred.errback(RuntimeError("Got status %d" % code))
# Ensures we don't continue until all callbacks on that
# deferred have fired
try:
yield deferred
except:
pass
logger.debug("TX [%s] Yielded to callbacks", destination)
except RuntimeError as e:
# We capture this here as there as nothing actually listens
# for this finishing functions deferred.
logger.warn(
"TX [%s] Problem in _attempt_transaction: %s",
destination,
e,
)
except Exception as e:
# We capture this here as there as nothing actually listens
# for this finishing functions deferred.
logger.exception(
"TX [%s] Problem in _attempt_transaction: %s",
destination,
e,
)
self.set_retrying(destination, retry_interval)
for deferred in deferreds:
if not deferred.called:
deferred.errback(e)
finally:
# We want to be *very* sure we delete this after we stop processing
self.pending_transactions.pop(destination, None)
# Check to see if there is anything else to send.
self._attempt_new_transaction(destination)
@defer.inlineCallbacks
def set_retrying(self, destination, retry_interval):
# track that this destination is having problems and we should
# give it a chance to recover before trying it again
if retry_interval:
retry_interval *= 2
# plateau at hourly retries for now
if retry_interval >= 60 * 60 * 1000:
retry_interval = 60 * 60 * 1000
else:
retry_interval = 2000 # try again at first after 2 seconds
yield self.store.set_destination_retry_timings(
destination,
int(self._clock.time_msec()),
retry_interval
)