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Add a caching layer to .well-known responses (#4516)
This commit is contained in:
Richard van der Hoff
GitHub
parent
3f189c902e
commit
bc5f6e1797
1
changelog.d/4516.feature
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1
changelog.d/4516.feature
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@ -0,0 +1 @@
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Implement MSC1708 (.well-known routing for server-server federation)
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@ -14,6 +14,8 @@
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# limitations under the License.
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import json
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import logging
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import random
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import time
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import attr
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from netaddr import IPAddress
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@ -22,13 +24,29 @@ from zope.interface import implementer
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from twisted.internet import defer
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from twisted.internet.endpoints import HostnameEndpoint, wrapClientTLS
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from twisted.web.client import URI, Agent, HTTPConnectionPool, readBody
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from twisted.web.http import stringToDatetime
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from twisted.web.http_headers import Headers
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from twisted.web.iweb import IAgent
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from synapse.http.federation.srv_resolver import SrvResolver, pick_server_from_list
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from synapse.util.caches.ttlcache import TTLCache
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from synapse.util.logcontext import make_deferred_yieldable
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# period to cache .well-known results for by default
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WELL_KNOWN_DEFAULT_CACHE_PERIOD = 24 * 3600
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# jitter to add to the .well-known default cache ttl
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WELL_KNOWN_DEFAULT_CACHE_PERIOD_JITTER = 10 * 60
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# period to cache failure to fetch .well-known for
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WELL_KNOWN_INVALID_CACHE_PERIOD = 1 * 3600
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# cap for .well-known cache period
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WELL_KNOWN_MAX_CACHE_PERIOD = 48 * 3600
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logger = logging.getLogger(__name__)
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well_known_cache = TTLCache('well-known')
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@implementer(IAgent)
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@ -57,6 +75,7 @@ class MatrixFederationAgent(object):
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self, reactor, tls_client_options_factory,
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_well_known_tls_policy=None,
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_srv_resolver=None,
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_well_known_cache=well_known_cache,
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):
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self._reactor = reactor
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self._tls_client_options_factory = tls_client_options_factory
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@ -77,6 +96,8 @@ class MatrixFederationAgent(object):
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_well_known_agent = Agent(self._reactor, pool=self._pool, **agent_args)
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self._well_known_agent = _well_known_agent
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self._well_known_cache = _well_known_cache
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@defer.inlineCallbacks
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def request(self, method, uri, headers=None, bodyProducer=None):
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"""
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@ -259,7 +280,14 @@ class MatrixFederationAgent(object):
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Deferred[bytes|None]: either the new server name, from the .well-known, or
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None if there was no .well-known file.
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"""
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# FIXME: add a cache
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try:
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cached = self._well_known_cache[server_name]
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defer.returnValue(cached)
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except KeyError:
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pass
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# TODO: should we linearise so that we don't end up doing two .well-known requests
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# for the same server in parallel?
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uri = b"https://%s/.well-known/matrix/server" % (server_name, )
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uri_str = uri.decode("ascii")
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@ -270,12 +298,14 @@ class MatrixFederationAgent(object):
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)
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except Exception as e:
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logger.info("Connection error fetching %s: %s", uri_str, e)
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self._well_known_cache.set(server_name, None, WELL_KNOWN_INVALID_CACHE_PERIOD)
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defer.returnValue(None)
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body = yield make_deferred_yieldable(readBody(response))
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if response.code != 200:
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logger.info("Error response %i from %s", response.code, uri_str)
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self._well_known_cache.set(server_name, None, WELL_KNOWN_INVALID_CACHE_PERIOD)
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defer.returnValue(None)
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try:
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@ -287,7 +317,63 @@ class MatrixFederationAgent(object):
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raise Exception("Missing key 'm.server'")
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except Exception as e:
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raise Exception("invalid .well-known response from %s: %s" % (uri_str, e,))
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defer.returnValue(parsed_body["m.server"].encode("ascii"))
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result = parsed_body["m.server"].encode("ascii")
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cache_period = _cache_period_from_headers(
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response.headers,
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time_now=self._reactor.seconds,
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)
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if cache_period is None:
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cache_period = WELL_KNOWN_DEFAULT_CACHE_PERIOD
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# add some randomness to the TTL to avoid a stampeding herd every hour after
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# startup
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cache_period += random.uniform(0, WELL_KNOWN_DEFAULT_CACHE_PERIOD_JITTER)
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else:
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cache_period = min(cache_period, WELL_KNOWN_MAX_CACHE_PERIOD)
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if cache_period > 0:
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self._well_known_cache.set(server_name, result, cache_period)
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defer.returnValue(result)
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def _cache_period_from_headers(headers, time_now=time.time):
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cache_controls = _parse_cache_control(headers)
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if b'no-store' in cache_controls:
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return 0
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if b'max-age' in cache_controls:
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try:
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max_age = int(cache_controls[b'max-age'])
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return max_age
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except ValueError:
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pass
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expires = headers.getRawHeaders(b'expires')
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if expires is not None:
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try:
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expires_date = stringToDatetime(expires[-1])
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return expires_date - time_now()
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except ValueError:
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# RFC7234 says 'A cache recipient MUST interpret invalid date formats,
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# especially the value "0", as representing a time in the past (i.e.,
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# "already expired").
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return 0
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return None
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def _parse_cache_control(headers):
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cache_controls = {}
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for hdr in headers.getRawHeaders(b'cache-control', []):
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for directive in hdr.split(b','):
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splits = [x.strip() for x in directive.split(b'=', 1)]
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k = splits[0].lower()
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v = splits[1] if len(splits) > 1 else None
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cache_controls[k] = v
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return cache_controls
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@attr.s
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161
synapse/util/caches/ttlcache.py
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161
synapse/util/caches/ttlcache.py
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@ -0,0 +1,161 @@
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# -*- coding: utf-8 -*-
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# Copyright 2015, 2016 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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import logging
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import time
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import attr
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from sortedcontainers import SortedList
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from synapse.util.caches import register_cache
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logger = logging.getLogger(__name__)
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SENTINEL = object()
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class TTLCache(object):
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"""A key/value cache implementation where each entry has its own TTL"""
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def __init__(self, cache_name, timer=time.time):
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# map from key to _CacheEntry
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self._data = {}
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# the _CacheEntries, sorted by expiry time
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self._expiry_list = SortedList()
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self._timer = timer
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self._metrics = register_cache("ttl", cache_name, self)
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def set(self, key, value, ttl):
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"""Add/update an entry in the cache
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Args:
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key: key for this entry
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value: value for this entry
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ttl (float): TTL for this entry, in seconds
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"""
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expiry = self._timer() + ttl
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self.expire()
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e = self._data.pop(key, SENTINEL)
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if e != SENTINEL:
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self._expiry_list.remove(e)
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entry = _CacheEntry(expiry_time=expiry, key=key, value=value)
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self._data[key] = entry
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self._expiry_list.add(entry)
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def get(self, key, default=SENTINEL):
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"""Get a value from the cache
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Args:
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key: key to look up
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default: default value to return, if key is not found. If not set, and the
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key is not found, a KeyError will be raised
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Returns:
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value from the cache, or the default
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"""
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self.expire()
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e = self._data.get(key, SENTINEL)
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if e == SENTINEL:
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self._metrics.inc_misses()
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if default == SENTINEL:
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raise KeyError(key)
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return default
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self._metrics.inc_hits()
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return e.value
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def get_with_expiry(self, key):
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"""Get a value, and its expiry time, from the cache
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Args:
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key: key to look up
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Returns:
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Tuple[Any, float]: the value from the cache, and the expiry time
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Raises:
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KeyError if the entry is not found
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"""
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self.expire()
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try:
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e = self._data[key]
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except KeyError:
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self._metrics.inc_misses()
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raise
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self._metrics.inc_hits()
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return e.value, e.expiry_time
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def pop(self, key, default=SENTINEL):
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"""Remove a value from the cache
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If key is in the cache, remove it and return its value, else return default.
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If default is not given and key is not in the cache, a KeyError is raised.
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Args:
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key: key to look up
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default: default value to return, if key is not found. If not set, and the
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key is not found, a KeyError will be raised
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Returns:
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value from the cache, or the default
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"""
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self.expire()
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e = self._data.pop(key, SENTINEL)
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if e == SENTINEL:
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self._metrics.inc_misses()
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if default == SENTINEL:
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raise KeyError(key)
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return default
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self._expiry_list.remove(e)
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self._metrics.inc_hits()
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return e.value
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def __getitem__(self, key):
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return self.get(key)
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def __delitem__(self, key):
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self.pop(key)
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def __contains__(self, key):
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return key in self._data
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def __len__(self):
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self.expire()
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return len(self._data)
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def expire(self):
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"""Run the expiry on the cache. Any entries whose expiry times are due will
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be removed
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"""
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now = self._timer()
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while self._expiry_list:
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first_entry = self._expiry_list[0]
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if first_entry.expiry_time - now > 0.0:
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break
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del self._data[first_entry.key]
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del self._expiry_list[0]
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@attr.s(frozen=True, slots=True)
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class _CacheEntry(object):
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"""TTLCache entry"""
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# expiry_time is the first attribute, so that entries are sorted by expiry.
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expiry_time = attr.ib()
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key = attr.ib()
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value = attr.ib()
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@ -24,11 +24,16 @@ from twisted.internet._sslverify import ClientTLSOptions, OpenSSLCertificateOpti
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from twisted.internet.protocol import Factory
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from twisted.protocols.tls import TLSMemoryBIOFactory
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from twisted.web.http import HTTPChannel
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from twisted.web.http_headers import Headers
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from twisted.web.iweb import IPolicyForHTTPS
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from synapse.crypto.context_factory import ClientTLSOptionsFactory
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from synapse.http.federation.matrix_federation_agent import MatrixFederationAgent
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from synapse.http.federation.matrix_federation_agent import (
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MatrixFederationAgent,
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_cache_period_from_headers,
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)
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from synapse.http.federation.srv_resolver import Server
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from synapse.util.caches.ttlcache import TTLCache
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from synapse.util.logcontext import LoggingContext
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from tests.http import ServerTLSContext
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@ -44,11 +49,14 @@ class MatrixFederationAgentTests(TestCase):
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self.mock_resolver = Mock()
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self.well_known_cache = TTLCache("test_cache", timer=self.reactor.seconds)
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self.agent = MatrixFederationAgent(
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reactor=self.reactor,
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tls_client_options_factory=ClientTLSOptionsFactory(None),
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_well_known_tls_policy=TrustingTLSPolicyForHTTPS(),
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_srv_resolver=self.mock_resolver,
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_well_known_cache=self.well_known_cache,
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)
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def _make_connection(self, client_factory, expected_sni):
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@ -115,7 +123,9 @@ class MatrixFederationAgentTests(TestCase):
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finally:
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_check_logcontext(context)
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def _handle_well_known_connection(self, client_factory, expected_sni, target_server):
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def _handle_well_known_connection(
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self, client_factory, expected_sni, target_server, response_headers={},
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):
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"""Handle an outgoing HTTPs connection: wire it up to a server, check that the
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request is for a .well-known, and send the response.
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@ -124,6 +134,8 @@ class MatrixFederationAgentTests(TestCase):
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expected_sni (bytes): SNI that we expect the outgoing connection to send
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target_server (bytes): target server that we should redirect to in the
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.well-known response.
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Returns:
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HTTPChannel: server impl
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"""
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# make the connection for .well-known
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well_known_server = self._make_connection(
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@ -133,9 +145,10 @@ class MatrixFederationAgentTests(TestCase):
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# check the .well-known request and send a response
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self.assertEqual(len(well_known_server.requests), 1)
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request = well_known_server.requests[0]
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self._send_well_known_response(request, target_server)
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self._send_well_known_response(request, target_server, headers=response_headers)
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return well_known_server
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def _send_well_known_response(self, request, target_server):
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def _send_well_known_response(self, request, target_server, headers={}):
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"""Check that an incoming request looks like a valid .well-known request, and
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send back the response.
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"""
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@ -146,6 +159,8 @@ class MatrixFederationAgentTests(TestCase):
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[b'testserv'],
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)
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# send back a response
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for k, v in headers.items():
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request.setHeader(k, v)
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request.write(b'{ "m.server": "%s" }' % (target_server,))
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request.finish()
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@ -448,6 +463,13 @@ class MatrixFederationAgentTests(TestCase):
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self.reactor.pump((0.1,))
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self.successResultOf(test_d)
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self.assertEqual(self.well_known_cache[b"testserv"], b"target-server")
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# check the cache expires
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self.reactor.pump((25 * 3600,))
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self.well_known_cache.expire()
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self.assertNotIn(b"testserv", self.well_known_cache)
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def test_get_hostname_srv(self):
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"""
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Test the behaviour when there is a single SRV record
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@ -661,6 +683,126 @@ class MatrixFederationAgentTests(TestCase):
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self.reactor.pump((0.1,))
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self.successResultOf(test_d)
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@defer.inlineCallbacks
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def do_get_well_known(self, serv):
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try:
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result = yield self.agent._get_well_known(serv)
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logger.info("Result from well-known fetch: %s", result)
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except Exception as e:
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logger.warning("Error fetching well-known: %s", e)
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raise
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defer.returnValue(result)
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def test_well_known_cache(self):
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self.reactor.lookups["testserv"] = "1.2.3.4"
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fetch_d = self.do_get_well_known(b'testserv')
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# there should be an attempt to connect on port 443 for the .well-known
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clients = self.reactor.tcpClients
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self.assertEqual(len(clients), 1)
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(host, port, client_factory, _timeout, _bindAddress) = clients.pop(0)
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self.assertEqual(host, '1.2.3.4')
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self.assertEqual(port, 443)
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well_known_server = self._handle_well_known_connection(
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client_factory,
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expected_sni=b"testserv",
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response_headers={b'Cache-Control': b'max-age=10'},
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target_server=b"target-server",
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)
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r = self.successResultOf(fetch_d)
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self.assertEqual(r, b'target-server')
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# close the tcp connection
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well_known_server.loseConnection()
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# repeat the request: it should hit the cache
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fetch_d = self.do_get_well_known(b'testserv')
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r = self.successResultOf(fetch_d)
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self.assertEqual(r, b'target-server')
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# expire the cache
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self.reactor.pump((10.0,))
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# now it should connect again
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fetch_d = self.do_get_well_known(b'testserv')
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self.assertEqual(len(clients), 1)
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(host, port, client_factory, _timeout, _bindAddress) = clients.pop(0)
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self.assertEqual(host, '1.2.3.4')
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self.assertEqual(port, 443)
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self._handle_well_known_connection(
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client_factory,
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expected_sni=b"testserv",
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target_server=b"other-server",
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)
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r = self.successResultOf(fetch_d)
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self.assertEqual(r, b'other-server')
|
||||
|
||||
|
||||
class TestCachePeriodFromHeaders(TestCase):
|
||||
def test_cache_control(self):
|
||||
# uppercase
|
||||
self.assertEqual(
|
||||
_cache_period_from_headers(
|
||||
Headers({b'Cache-Control': [b'foo, Max-Age = 100, bar']}),
|
||||
), 100,
|
||||
)
|
||||
|
||||
# missing value
|
||||
self.assertIsNone(_cache_period_from_headers(
|
||||
Headers({b'Cache-Control': [b'max-age=, bar']}),
|
||||
))
|
||||
|
||||
# hackernews: bogus due to semicolon
|
||||
self.assertIsNone(_cache_period_from_headers(
|
||||
Headers({b'Cache-Control': [b'private; max-age=0']}),
|
||||
))
|
||||
|
||||
# github
|
||||
self.assertEqual(
|
||||
_cache_period_from_headers(
|
||||
Headers({b'Cache-Control': [b'max-age=0, private, must-revalidate']}),
|
||||
), 0,
|
||||
)
|
||||
|
||||
# google
|
||||
self.assertEqual(
|
||||
_cache_period_from_headers(
|
||||
Headers({b'cache-control': [b'private, max-age=0']}),
|
||||
), 0,
|
||||
)
|
||||
|
||||
def test_expires(self):
|
||||
self.assertEqual(
|
||||
_cache_period_from_headers(
|
||||
Headers({b'Expires': [b'Wed, 30 Jan 2019 07:35:33 GMT']}),
|
||||
time_now=lambda: 1548833700
|
||||
), 33,
|
||||
)
|
||||
|
||||
# cache-control overrides expires
|
||||
self.assertEqual(
|
||||
_cache_period_from_headers(
|
||||
Headers({
|
||||
b'cache-control': [b'max-age=10'],
|
||||
b'Expires': [b'Wed, 30 Jan 2019 07:35:33 GMT']
|
||||
}),
|
||||
time_now=lambda: 1548833700
|
||||
), 10,
|
||||
)
|
||||
|
||||
# invalid expires means immediate expiry
|
||||
self.assertEqual(
|
||||
_cache_period_from_headers(
|
||||
Headers({b'Expires': [b'0']}),
|
||||
), 0,
|
||||
)
|
||||
|
||||
|
||||
def _check_logcontext(context):
|
||||
current = LoggingContext.current_context()
|
||||
|
||||
@ -360,6 +360,7 @@ class FakeTransport(object):
|
||||
"""
|
||||
|
||||
disconnecting = False
|
||||
disconnected = False
|
||||
buffer = attr.ib(default=b'')
|
||||
producer = attr.ib(default=None)
|
||||
|
||||
@ -370,14 +371,16 @@ class FakeTransport(object):
|
||||
return None
|
||||
|
||||
def loseConnection(self, reason=None):
|
||||
logger.info("FakeTransport: loseConnection(%s)", reason)
|
||||
if not self.disconnecting:
|
||||
logger.info("FakeTransport: loseConnection(%s)", reason)
|
||||
self.disconnecting = True
|
||||
if self._protocol:
|
||||
self._protocol.connectionLost(reason)
|
||||
self.disconnected = True
|
||||
|
||||
def abortConnection(self):
|
||||
self.disconnecting = True
|
||||
logger.info("FakeTransport: abortConnection()")
|
||||
self.loseConnection()
|
||||
|
||||
def pauseProducing(self):
|
||||
if not self.producer:
|
||||
@ -416,9 +419,16 @@ class FakeTransport(object):
|
||||
# TLSMemoryBIOProtocol
|
||||
return
|
||||
|
||||
if self.disconnected:
|
||||
return
|
||||
logger.info("%s->%s: %s", self._protocol, self.other, self.buffer)
|
||||
|
||||
if getattr(self.other, "transport") is not None:
|
||||
try:
|
||||
self.other.dataReceived(self.buffer)
|
||||
self.buffer = b""
|
||||
except Exception as e:
|
||||
logger.warning("Exception writing to protocol: %s", e)
|
||||
return
|
||||
|
||||
self._reactor.callLater(0.0, _write)
|
||||
|
||||
83
tests/util/caches/test_ttlcache.py
Normal file
83
tests/util/caches/test_ttlcache.py
Normal file
@ -0,0 +1,83 @@
|
||||
# -*- coding: utf-8 -*-
|
||||
# Copyright 2019 New Vector 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 mock import Mock
|
||||
|
||||
from synapse.util.caches.ttlcache import TTLCache
|
||||
|
||||
from tests import unittest
|
||||
|
||||
|
||||
class CacheTestCase(unittest.TestCase):
|
||||
def setUp(self):
|
||||
self.mock_timer = Mock(side_effect=lambda: 100.0)
|
||||
self.cache = TTLCache("test_cache", self.mock_timer)
|
||||
|
||||
def test_get(self):
|
||||
"""simple set/get tests"""
|
||||
self.cache.set('one', '1', 10)
|
||||
self.cache.set('two', '2', 20)
|
||||
self.cache.set('three', '3', 30)
|
||||
|
||||
self.assertEqual(len(self.cache), 3)
|
||||
|
||||
self.assertTrue('one' in self.cache)
|
||||
self.assertEqual(self.cache.get('one'), '1')
|
||||
self.assertEqual(self.cache['one'], '1')
|
||||
self.assertEqual(self.cache.get_with_expiry('one'), ('1', 110))
|
||||
self.assertEqual(self.cache._metrics.hits, 3)
|
||||
self.assertEqual(self.cache._metrics.misses, 0)
|
||||
|
||||
self.cache.set('two', '2.5', 20)
|
||||
self.assertEqual(self.cache['two'], '2.5')
|
||||
self.assertEqual(self.cache._metrics.hits, 4)
|
||||
|
||||
# non-existent-item tests
|
||||
self.assertEqual(self.cache.get('four', '4'), '4')
|
||||
self.assertIs(self.cache.get('four', None), None)
|
||||
|
||||
with self.assertRaises(KeyError):
|
||||
self.cache['four']
|
||||
|
||||
with self.assertRaises(KeyError):
|
||||
self.cache.get('four')
|
||||
|
||||
with self.assertRaises(KeyError):
|
||||
self.cache.get_with_expiry('four')
|
||||
|
||||
self.assertEqual(self.cache._metrics.hits, 4)
|
||||
self.assertEqual(self.cache._metrics.misses, 5)
|
||||
|
||||
def test_expiry(self):
|
||||
self.cache.set('one', '1', 10)
|
||||
self.cache.set('two', '2', 20)
|
||||
self.cache.set('three', '3', 30)
|
||||
|
||||
self.assertEqual(len(self.cache), 3)
|
||||
self.assertEqual(self.cache['one'], '1')
|
||||
self.assertEqual(self.cache['two'], '2')
|
||||
|
||||
# enough for the first entry to expire, but not the rest
|
||||
self.mock_timer.side_effect = lambda: 110.0
|
||||
|
||||
self.assertEqual(len(self.cache), 2)
|
||||
self.assertFalse('one' in self.cache)
|
||||
self.assertEqual(self.cache['two'], '2')
|
||||
self.assertEqual(self.cache['three'], '3')
|
||||
|
||||
self.assertEqual(self.cache.get_with_expiry('two'), ('2', 120))
|
||||
|
||||
self.assertEqual(self.cache._metrics.hits, 5)
|
||||
self.assertEqual(self.cache._metrics.misses, 0)
|
||||
Loading…
Reference in New Issue
Block a user