mirror of
https://github.com/element-hq/synapse.git
synced 2024-12-22 20:50:23 +03:00
153 lines
5.1 KiB
Python
153 lines
5.1 KiB
Python
# -*- 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
|
|
|
|
from synapse.api.errors import CodeMessageException
|
|
|
|
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):
|
|
"""For a given destination check if we have previously failed to
|
|
send a request there and are waiting before retrying the destination.
|
|
If we are not ready to retry the destination, this will raise a
|
|
NotRetryingDestination exception. Otherwise, will return a Context Manager
|
|
that will mark the destination as down if an exception is thrown (excluding
|
|
CodeMessageException with code < 500)
|
|
|
|
Example usage:
|
|
|
|
try:
|
|
limiter = yield get_retry_limiter(destination, clock, store)
|
|
with limiter:
|
|
response = yield do_request()
|
|
except NotRetryingDestination:
|
|
# We aren't ready to retry that destination.
|
|
raise
|
|
"""
|
|
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=5000, max_retry_interval=60 * 60 * 1000,
|
|
multiplier_retry_interval=2,):
|
|
"""Marks the destination as "down" if an exception is thrown in the
|
|
context, except for CodeMessageException with code < 500.
|
|
|
|
If no exception is raised, marks the destination as "up".
|
|
|
|
Args:
|
|
destination (str)
|
|
clock (Clock)
|
|
store (DataStore)
|
|
retry_interval (int): The next retry interval taken from the
|
|
database in milliseconds, or zero if the last request was
|
|
successful.
|
|
min_retry_interval (int): The minimum retry interval to use after
|
|
a failed request, in milliseconds.
|
|
max_retry_interval (int): The maximum retry interval to use after
|
|
a failed request, in milliseconds.
|
|
multiplier_retry_interval (int): The multiplier to use to increase
|
|
the retry interval after a failed request.
|
|
"""
|
|
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(failure):
|
|
logger.exception(
|
|
"Failed to store set_destination_retry_timings",
|
|
failure.value
|
|
)
|
|
|
|
valid_err_code = False
|
|
if exc_type is CodeMessageException:
|
|
valid_err_code = 0 <= exc_val.code < 500
|
|
|
|
if exc_type is None or valid_err_code:
|
|
# We connected successfully.
|
|
if not self.retry_interval:
|
|
return
|
|
|
|
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)
|