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