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Add per server retry limiting. 

Factor out the pre destination retry logic from TransactionQueue so it
can be reused in both get_pdu and crypto.keyring
This commit is contained in:
Erik Johnston 2015-02-17 17:20:56 +00:00
parent 5025305fb2
commit 2b8f1a956c
4 changed files with 205 additions and 122 deletions
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22
synapse/crypto/keyring.py
View File

@ -22,6 +22,8 @@ from syutil.crypto.signing_key import (
from syutil.base64util import decode_base64, encode_base64
from synapse.api.errors import SynapseError, Codes
from synapse.util.retryutils import get_retry_limiter
from OpenSSL import crypto
import logging
@ -88,19 +90,13 @@ class Keyring(object):
# Try to fetch the key from the remote server.
retry_last_ts, retry_interval = (0, 0)
retry_timings = yield self.store.get_destination_retry_timings(
server_name
limiter = yield get_retry_limiter(
server_name,
self.clock,
self.store,
)
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("%s not ready for retry", server_name)
raise ValueError("No verification key found for given key ids")
try:
with limiter:
(response, tls_certificate) = yield fetch_server_key(
server_name, self.hs.tls_context_factory
)
@ -165,7 +161,3 @@ class Keyring(object):
return
raise ValueError("No verification key found for given key ids")
except:
self.set_retrying(server_name, retry_interval)
raise

36
synapse/federation/federation_client.py
View File

@ -23,6 +23,8 @@ from synapse.api.errors import CodeMessageException
from synapse.util.logutils import log_function
from synapse.events import FrozenEvent
from synapse.util.retryutils import get_retry_limiter, NotRetryingDestination
import logging
@ -163,24 +165,34 @@ class FederationClient(FederationBase):
pdu = None
for destination in destinations:
try:
transaction_data = yield self.transport_layer.get_event(
destination, event_id
limiter = yield get_retry_limiter(
destination,
self._clock,
self.store,
)
logger.debug("transaction_data %r", transaction_data)
with limiter:
transaction_data = yield self.transport_layer.get_event(
destination, event_id
)
pdu_list = [
self.event_from_pdu_json(p, outlier=outlier)
for p in transaction_data["pdus"]
]
logger.debug("transaction_data %r", transaction_data)
if pdu_list:
pdu = pdu_list[0]
pdu_list = [
self.event_from_pdu_json(p, outlier=outlier)
for p in transaction_data["pdus"]
]
# Check signatures are correct.
pdu = yield self._check_sigs_and_hash(pdu)
if pdu_list:
pdu = pdu_list[0]
break
# Check signatures are correct.
pdu = yield self._check_sigs_and_hash(pdu)
break
except NotRetryingDestination as e:
logger.info(e.message)
continue
except CodeMessageException:
raise
except Exception as e:

161
synapse/federation/transaction_queue.py
View File

@ -22,6 +22,9 @@ from .units import Transaction
from synapse.api.errors import HttpResponseException
from synapse.util.logutils import log_function
from synapse.util.logcontext import PreserveLoggingContext
from synapse.util.retryutils import (
get_retry_limiter, NotRetryingDestination,
)
import logging
@ -138,25 +141,6 @@ 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.
@ -204,77 +188,79 @@ class TransactionQueue(object):
]
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]",
limiter = yield get_retry_limiter(
destination,
transaction.transaction_id,
self._clock,
self.store,
)
# Actually send the transaction
with limiter:
self.pending_transactions[destination] = 1
# 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
logger.debug("TX [%s] Persisting transaction...", destination)
try:
response = yield self.transport_layer.send_transaction(
transaction, json_data_cb
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,
)
code = 200
except HttpResponseException as e:
code = e.code
response = e.response
logger.info("TX [%s] got %d response", destination, code)
self._next_txn_id += 1
logger.debug("TX [%s] Sent transaction", destination)
logger.debug("TX [%s] Marking as delivered...", destination)
yield self.transaction_actions.prepare_to_send(transaction)
yield self.transaction_actions.delivered(
transaction, code, response
)
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] 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
@ -285,6 +271,12 @@ class TransactionQueue(object):
pass
logger.debug("TX [%s] Yielded to callbacks", destination)
except NotRetryingDestination:
logger.info(
"TX [%s] not ready for retry yet - "
"dropping transaction for now",
destination,
)
except RuntimeError as e:
# We capture this here as there as nothing actually listens
# for this finishing functions deferred.
@ -302,8 +294,6 @@ class TransactionQueue(object):
e,
)
self.set_retrying(destination, retry_interval)
for deferred in deferreds:
if not deferred.called:
deferred.errback(e)
@ -314,22 +304,3 @@ 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
)

108
synapse/util/retryutils.py Normal file
View File

@ -0,0 +1,108 @@
# -*- coding: utf-8 -*-
# Copyright 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
import logging
logger = logging.getLogger(__name__)
class NotRetryingDestination(Exception):
def __init__(self, retry_last_ts, retry_interval, destination):
msg = "Not retrying server %s." % (destination,)
super(NotRetryingDestination, self).__init__(msg)
self.retry_last_ts = retry_last_ts
self.retry_interval = retry_interval
self.destination = destination
@defer.inlineCallbacks
def get_retry_limiter(destination, clock, store, **kwargs):
retry_last_ts, retry_interval = (0, 0)
retry_timings = yield store.get_destination_retry_timings(
destination
)
if retry_timings:
retry_last_ts, retry_interval = (
retry_timings.retry_last_ts, retry_timings.retry_interval
)
now = int(clock.time_msec())
if retry_last_ts + retry_interval > now:
raise NotRetryingDestination(
retry_last_ts=retry_last_ts,
retry_interval=retry_interval,
destination=destination,
)
defer.returnValue(
RetryDestinationLimiter(
destination,
clock,
store,
retry_interval,
**kwargs
)
)
class RetryDestinationLimiter(object):
def __init__(self, destination, clock, store, retry_interval,
min_retry_interval=20000, max_retry_interval=60 * 60 * 1000,
multiplier_retry_interval=2):
self.clock = clock
self.store = store
self.destination = destination
self.retry_interval = retry_interval
self.min_retry_interval = min_retry_interval
self.max_retry_interval = max_retry_interval
self.multiplier_retry_interval = multiplier_retry_interval
def __enter__(self):
pass
def __exit__(self, exc_type, exc_val, exc_tb):
def err(self, failure):
logger.exception(
"Failed to store set_destination_retry_timings",
failure.value
)
if exc_type is None and exc_val is None and exc_tb is None:
# We connected successfully.
retry_last_ts = 0
self.retry_interval = 0
else:
# We couldn't connect.
if self.retry_interval:
self.retry_interval *= self.multiplier_retry_interval
if self.retry_interval >= self.max_retry_interval:
self.retry_interval = self.max_retry_interval
else:
self.retry_interval = self.min_retry_interval
retry_last_ts = int(self._clock.time_msec()),
self.store.set_destination_retry_timings(
self.destination, retry_last_ts, self.retry_interval
).addErrback(err)