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Merge pull request #22 from matrix-org/federation_retries 

Federation retries
This commit is contained in:
Erik Johnston 2014-12-10 10:35:57 +00:00
parent 617dde2ba9 0f4dcab238
commit 6497caee7c
14 changed files with 277 additions and 24 deletions
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91
synapse/federation/replication.py
View File

@ -334,7 +334,7 @@ class ReplicationLayer(object):
defer.returnValue(response)
return
logger.debug("[%s] Transacition is new", transaction.transaction_id)
logger.debug("[%s] Transaction is new", transaction.transaction_id)
with PreserveLoggingContext():
dl = []
@ -685,6 +685,7 @@ class _TransactionQueue(object):
self.transport_layer = transport_layer
self._clock = hs.get_clock()
self.store = hs.get_datastore()
# Is a mapping from destinations -> deferreds. Used to keep track
# of which destinations have transactions in flight and when they are
@ -728,8 +729,14 @@ class _TransactionQueue(object):
(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)
self._attempt_new_transaction(destination).addErrback(eb)
deferreds.append(deferred)
@ -739,6 +746,9 @@ class _TransactionQueue(object):
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)
@ -748,7 +758,7 @@ class _TransactionQueue(object):
if not deferred.called:
deferred.errback(failure)
else:
logger.exception("Failed to send edu", failure)
logger.warn("Failed to send edu", failure)
with PreserveLoggingContext():
self._attempt_new_transaction(destination).addErrback(eb)
@ -770,7 +780,30 @@ class _TransactionQueue(object):
@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
return
# list of (pending_pdu, deferred, order)
@ -781,7 +814,14 @@ class _TransactionQueue(object):
if not pending_pdus and not pending_edus and not pending_failures:
return
logger.debug("TX [%s] Attempting new transaction", destination)
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])
@ -814,7 +854,11 @@ class _TransactionQueue(object):
yield self.transaction_actions.prepare_to_send(transaction)
logger.debug("TX [%s] Persisted transaction", destination)
logger.debug("TX [%s] Sending transaction...", destination)
logger.info(
"TX [%s] Sending transaction [%s]",
destination,
transaction.transaction_id,
)
# Actually send the transaction
@ -835,6 +879,8 @@ class _TransactionQueue(object):
transaction, json_data_cb
)
logger.info("TX [%s] got %d response", destination, code)
logger.debug("TX [%s] Sent transaction", destination)
logger.debug("TX [%s] Marking as delivered...", destination)
@ -847,8 +893,14 @@ class _TransactionQueue(object):
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
@ -861,11 +913,15 @@ class _TransactionQueue(object):
logger.debug("TX [%s] Yielded to callbacks", destination)
except Exception as e:
logger.error("TX Problem in _attempt_transaction")
# We capture this here as there as nothing actually listens
# for this finishing functions deferred.
logger.exception(e)
logger.warn(
"TX [%s] Problem in _attempt_transaction: %s",
destination,
e,
)
self.set_retrying(destination, retry_interval)
for deferred in deferreds:
if not deferred.called:
@ -877,3 +933,22 @@ class _TransactionQueue(object):
# 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
)

2
synapse/federation/transport.py
View File

@ -155,7 +155,7 @@ class TransportLayer(object):
@defer.inlineCallbacks
@log_function
def send_transaction(self, transaction, json_data_callback=None):
""" Sends the given Transaction to it's destination
""" Sends the given Transaction to its destination
Args:
transaction (Transaction)

7
synapse/handlers/federation.py
View File

@ -208,6 +208,13 @@ class FederationHandler(BaseHandler):
affected=event.event_id,
)
# if we're receiving valid events from an origin,
# it's probably a good idea to mark it as not in retry-state
# for sending (although this is a bit of a leap)
retry_timings = yield self.store.get_destination_retry_timings(origin)
if (retry_timings and retry_timings.retry_last_ts):
self.store.set_destination_retry_timings(origin, 0, 0)
room = yield self.store.get_room(event.room_id)
if not room:

33
synapse/http/matrixfederationclient.py
View File

@ -89,7 +89,7 @@ class MatrixFederationHttpClient(object):
("", "", path_bytes, param_bytes, query_bytes, "",)
)
logger.debug("Sending request to %s: %s %s",
logger.info("Sending request to %s: %s %s",
destination, method, url_bytes)
logger.debug(
@ -101,6 +101,8 @@ class MatrixFederationHttpClient(object):
]
)
# XXX: Would be much nicer to retry only at the transaction-layer
# (once we have reliable transactions in place)
retries_left = 5
endpoint = self._getEndpoint(reactor, destination)
@ -127,11 +129,20 @@ class MatrixFederationHttpClient(object):
break
except Exception as e:
if not retry_on_dns_fail and isinstance(e, DNSLookupError):
logger.warn("DNS Lookup failed to %s with %s", destination,
e)
logger.warn(
"DNS Lookup failed to %s with %s",
destination,
e
)
raise SynapseError(400, "Domain specified not found.")
logger.exception("Got error in _create_request")
logger.warn(
"Sending request failed to %s: %s %s : %s",
destination,
method,
url_bytes,
e
)
_print_ex(e)
if retries_left:
@ -140,15 +151,21 @@ class MatrixFederationHttpClient(object):
else:
raise
logger.info(
"Received response %d %s for %s: %s %s",
response.code,
response.phrase,
destination,
method,
url_bytes
)
if 200 <= response.code < 300:
# We need to update the transactions table to say it was sent?
pass
else:
# :'(
# Update transactions table?
logger.error(
"Got response %d %s", response.code, response.phrase
)
raise CodeMessageException(
response.code, response.phrase
)
@ -284,7 +301,7 @@ def _print_ex(e):
for ex in e.reasons:
_print_ex(ex)
else:
logger.exception(e)
logger.warn(e)
class _JsonProducer(object):

2
synapse/rest/transactions.py
View File

@ -19,7 +19,7 @@ import logging
logger = logging.getLogger(__name__)
# FIXME: elsewhere we use FooStore to indicate something in the storage layer...
class HttpTransactionStore(object):
def __init__(self):

2
synapse/storage/__init__.py
View File

@ -67,7 +67,7 @@ SCHEMAS = [
# Remember to update this number every time an incompatible change is made to
# database schema files, so the users will be informed on server restarts.
SCHEMA_VERSION = 8
SCHEMA_VERSION = 9
class _RollbackButIsFineException(Exception):

2
synapse/storage/_base.py
View File

@ -650,7 +650,7 @@ class JoinHelper(object):
to dump the results into.
Attributes:
taples (list): List of `Table` classes
tables (list): List of `Table` classes
EntryType (type)
"""

23
synapse/storage/schema/delta/v9.sql Normal file
View File

@ -0,0 +1,23 @@
/* Copyright 2014 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.
*/
-- To track destination health
CREATE TABLE IF NOT EXISTS destinations(
destination TEXT PRIMARY KEY,
retry_last_ts INTEGER,
retry_interval INTEGER
);
PRAGMA user_version = 9;

6
synapse/storage/schema/transactions.sql
View File

@ -59,3 +59,9 @@ CREATE INDEX IF NOT EXISTS transaction_id_to_pdu_tx ON transaction_id_to_pdu(tra
CREATE INDEX IF NOT EXISTS transaction_id_to_pdu_dest ON transaction_id_to_pdu(destination);
CREATE INDEX IF NOT EXISTS transaction_id_to_pdu_index ON transaction_id_to_pdu(transaction_id, destination);
-- To track destination health
CREATE TABLE IF NOT EXISTS destinations(
destination TEXT PRIMARY KEY,
retry_last_ts INTEGER,
retry_interval INTEGER
);

106
synapse/storage/transactions.py
View File

@ -17,6 +17,8 @@ from ._base import SQLBaseStore, Table
from collections import namedtuple
from twisted.internet import defer
import logging
logger = logging.getLogger(__name__)
@ -26,6 +28,10 @@ class TransactionStore(SQLBaseStore):
"""A collection of queries for handling PDUs.
"""
# a write-through cache of DestinationsTable.EntryType indexed by
# destination string
destination_retry_cache = {}
def get_received_txn_response(self, transaction_id, origin):
"""For an incoming transaction from a given origin, check if we have
already responded to it. If so, return the response code and response
@ -114,7 +120,7 @@ class TransactionStore(SQLBaseStore):
def _prep_send_transaction(self, txn, transaction_id, destination,
origin_server_ts):
# First we find out what the prev_txs should be.
# First we find out what the prev_txns should be.
# Since we know that we are only sending one transaction at a time,
# we can simply take the last one.
query = "%s ORDER BY id DESC LIMIT 1" % (
@ -205,6 +211,92 @@ class TransactionStore(SQLBaseStore):
return ReceivedTransactionsTable.decode_results(txn.fetchall())
def get_destination_retry_timings(self, destination):
"""Gets the current retry timings (if any) for a given destination.
Args:
destination (str)
Returns:
None if not retrying
Otherwise a DestinationsTable.EntryType for the retry scheme
"""
if destination in self.destination_retry_cache:
return defer.succeed(self.destination_retry_cache[destination])
return self.runInteraction(
"get_destination_retry_timings",
self._get_destination_retry_timings, destination)
def _get_destination_retry_timings(cls, txn, destination):
query = DestinationsTable.select_statement("destination = ?")
txn.execute(query, (destination,))
result = txn.fetchall()
if result:
result = DestinationsTable.decode_single_result(result)
if result.retry_last_ts > 0:
return result
else:
return None
def set_destination_retry_timings(self, destination,
retry_last_ts, retry_interval):
"""Sets the current retry timings for a given destination.
Both timings should be zero if retrying is no longer occuring.
Args:
destination (str)
retry_last_ts (int) - time of last retry attempt in unix epoch ms
retry_interval (int) - how long until next retry in ms
"""
self.destination_retry_cache[destination] = (
DestinationsTable.EntryType(
destination,
retry_last_ts,
retry_interval
)
)
# XXX: we could chose to not bother persisting this if our cache thinks
# this is a NOOP
return self.runInteraction(
"set_destination_retry_timings",
self._set_destination_retry_timings,
destination,
retry_last_ts,
retry_interval,
)
def _set_destination_retry_timings(cls, txn, destination,
retry_last_ts, retry_interval):
query = (
"INSERT OR REPLACE INTO %s "
"(destination, retry_last_ts, retry_interval) "
"VALUES (?, ?, ?) "
) % DestinationsTable.table_name
txn.execute(query, (destination, retry_last_ts, retry_interval))
def get_destinations_needing_retry(self):
"""Get all destinations which are due a retry for sending a transaction.
Returns:
list: A list of `DestinationsTable.EntryType`
"""
return self.runInteraction(
"get_destinations_needing_retry",
self._get_destinations_needing_retry
)
def _get_destinations_needing_retry(cls, txn):
where = "retry_last_ts > 0 and retry_next_ts < now()"
query = DestinationsTable.select_statement(where)
txn.execute(query)
return DestinationsTable.decode_results(txn.fetchall())
class ReceivedTransactionsTable(Table):
table_name = "received_transactions"
@ -247,3 +339,15 @@ class TransactionsToPduTable(Table):
]
EntryType = namedtuple("TransactionsToPduEntry", fields)
class DestinationsTable(Table):
table_name = "destinations"
fields = [
"destination",
"retry_last_ts",
"retry_interval",
]
EntryType = namedtuple("DestinationsEntry", fields)

5
tests/federation/test_federation.py
View File

@ -25,6 +25,7 @@ from synapse.server import HomeServer
from synapse.federation import initialize_http_replication
from synapse.api.events import SynapseEvent
from synapse.storage.transactions import DestinationsTable
def make_pdu(prev_pdus=[], **kwargs):
"""Provide some default fields for making a PduTuple."""
@ -55,10 +56,14 @@ class FederationTestCase(unittest.TestCase):
"delivered_txn",
"get_received_txn_response",
"set_received_txn_response",
"get_destination_retry_timings",
])
self.mock_persistence.get_received_txn_response.return_value = (
defer.succeed(None)
)
self.mock_persistence.get_destination_retry_timings.return_value = (
defer.succeed(DestinationsTable.EntryType("", 0, 0))
)
self.mock_config = Mock()
self.mock_config.signing_key = [MockKey()]
self.clock = MockClock()

2
tests/handlers/test_federation.py
View File

@ -53,6 +53,8 @@ class FederationTestCase(unittest.TestCase):
"persist_event",
"store_room",
"get_room",
"get_destination_retry_timings",
"set_destination_retry_timings",
]),
resource_for_federation=NonCallableMock(),
http_client=NonCallableMock(spec_set=[]),

10
tests/handlers/test_presence.py
View File

@ -30,7 +30,7 @@ from synapse.api.constants import PresenceState
from synapse.api.errors import SynapseError
from synapse.handlers.presence import PresenceHandler, UserPresenceCache
from synapse.streams.config import SourcePaginationConfig
from synapse.storage.transactions import DestinationsTable
OFFLINE = PresenceState.OFFLINE
UNAVAILABLE = PresenceState.UNAVAILABLE
@ -528,6 +528,7 @@ class PresencePushTestCase(unittest.TestCase):
"delivered_txn",
"get_received_txn_response",
"set_received_txn_response",
"get_destination_retry_timings",
]),
handlers=None,
resource_for_client=Mock(),
@ -539,6 +540,9 @@ class PresencePushTestCase(unittest.TestCase):
hs.handlers = JustPresenceHandlers(hs)
self.datastore = hs.get_datastore()
self.datastore.get_destination_retry_timings.return_value = (
defer.succeed(DestinationsTable.EntryType("", 0, 0))
)
def get_received_txn_response(*args):
return defer.succeed(None)
@ -1037,6 +1041,7 @@ class PresencePollingTestCase(unittest.TestCase):
"delivered_txn",
"get_received_txn_response",
"set_received_txn_response",
"get_destination_retry_timings",
]),
handlers=None,
resource_for_client=Mock(),
@ -1048,6 +1053,9 @@ class PresencePollingTestCase(unittest.TestCase):
hs.handlers = JustPresenceHandlers(hs)
self.datastore = hs.get_datastore()
self.datastore.get_destination_retry_timings.return_value = (
defer.succeed(DestinationsTable.EntryType("", 0, 0))
)
def get_received_txn_response(*args):
return defer.succeed(None)

6
tests/handlers/test_typing.py
View File

@ -25,6 +25,8 @@ from ..utils import MockHttpResource, MockClock, DeferredMockCallable, MockKey
from synapse.server import HomeServer
from synapse.handlers.typing import TypingNotificationHandler
from synapse.storage.transactions import DestinationsTable
def _expect_edu(destination, edu_type, content, origin="test"):
return {
@ -72,6 +74,7 @@ class TypingNotificationsTestCase(unittest.TestCase):
"delivered_txn",
"get_received_txn_response",
"set_received_txn_response",
"get_destination_retry_timings",
]),
handlers=None,
resource_for_client=Mock(),
@ -89,6 +92,9 @@ class TypingNotificationsTestCase(unittest.TestCase):
self.handler.push_update_to_clients = self.mock_update_client
self.datastore = hs.get_datastore()
self.datastore.get_destination_retry_timings.return_value = (
defer.succeed(DestinationsTable.EntryType("", 0, 0))
)
def get_received_txn_response(*args):
return defer.succeed(None)