diff options
| -rw-r--r-- | synapse/crypto/keyring.py | 120 | ||||
| -rw-r--r-- | synapse/federation/federation_client.py | 36 | ||||
| -rw-r--r-- | synapse/federation/transaction_queue.py | 161 | ||||
| -rw-r--r-- | synapse/util/retryutils.py | 108 |
4 files changed, 262 insertions, 163 deletions
diff --git a/synapse/crypto/keyring.py b/synapse/crypto/keyring.py index 3fb99f7125..ea00c830c0 100644 --- a/synapse/crypto/keyring.py +++ b/synapse/crypto/keyring.py @@ -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 @@ -87,69 +89,75 @@ class Keyring(object): return # Try to fetch the key from the remote server. - # TODO(markjh): Ratelimit requests to a given server. - - (response, tls_certificate) = yield fetch_server_key( - server_name, self.hs.tls_context_factory - ) - # Check the response. - - x509_certificate_bytes = crypto.dump_certificate( - crypto.FILETYPE_ASN1, tls_certificate + limiter = yield get_retry_limiter( + server_name, + self.clock, + self.store, ) - if ("signatures" not in response - or server_name not in response["signatures"]): - raise ValueError("Key response not signed by remote server") - - if "tls_certificate" not in response: - raise ValueError("Key response missing TLS certificate") + with limiter: + (response, tls_certificate) = yield fetch_server_key( + server_name, self.hs.tls_context_factory + ) - tls_certificate_b64 = response["tls_certificate"] + # Check the response. - if encode_base64(x509_certificate_bytes) != tls_certificate_b64: - raise ValueError("TLS certificate doesn't match") + x509_certificate_bytes = crypto.dump_certificate( + crypto.FILETYPE_ASN1, tls_certificate + ) - verify_keys = {} - for key_id, key_base64 in response["verify_keys"].items(): - if is_signing_algorithm_supported(key_id): - key_bytes = decode_base64(key_base64) - verify_key = decode_verify_key_bytes(key_id, key_bytes) - verify_keys[key_id] = verify_key + if ("signatures" not in response + or server_name not in response["signatures"]): + raise ValueError("Key response not signed by remote server") + + if "tls_certificate" not in response: + raise ValueError("Key response missing TLS certificate") + + tls_certificate_b64 = response["tls_certificate"] + + if encode_base64(x509_certificate_bytes) != tls_certificate_b64: + raise ValueError("TLS certificate doesn't match") + + verify_keys = {} + for key_id, key_base64 in response["verify_keys"].items(): + if is_signing_algorithm_supported(key_id): + key_bytes = decode_base64(key_base64) + verify_key = decode_verify_key_bytes(key_id, key_bytes) + verify_keys[key_id] = verify_key + + for key_id in response["signatures"][server_name]: + if key_id not in response["verify_keys"]: + raise ValueError( + "Key response must include verification keys for all" + " signatures" + ) + if key_id in verify_keys: + verify_signed_json( + response, + server_name, + verify_keys[key_id] + ) + + # Cache the result in the datastore. + + time_now_ms = self.clock.time_msec() + + yield self.store.store_server_certificate( + server_name, + server_name, + time_now_ms, + tls_certificate, + ) - for key_id in response["signatures"][server_name]: - if key_id not in response["verify_keys"]: - raise ValueError( - "Key response must include verification keys for all" - " signatures" + for key_id, key in verify_keys.items(): + yield self.store.store_server_verify_key( + server_name, server_name, time_now_ms, key ) - if key_id in verify_keys: - verify_signed_json( - response, - server_name, - verify_keys[key_id] - ) - - # Cache the result in the datastore. - - time_now_ms = self.clock.time_msec() - - yield self.store.store_server_certificate( - server_name, - server_name, - time_now_ms, - tls_certificate, - ) - - for key_id, key in verify_keys.items(): - yield self.store.store_server_verify_key( - server_name, server_name, time_now_ms, key - ) - for key_id in key_ids: - if key_id in verify_keys: - defer.returnValue(verify_keys[key_id]) - return + for key_id in key_ids: + if key_id in verify_keys: + defer.returnValue(verify_keys[key_id]) + return - raise ValueError("No verification key found for given key ids") + raise ValueError("No verification key found for given key ids") diff --git a/synapse/federation/federation_client.py b/synapse/federation/federation_client.py index 70c9a6f46b..c5b0274c2f 100644 --- a/synapse/federation/federation_client.py +++ b/synapse/federation/federation_client.py @@ -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: diff --git a/synapse/federation/transaction_queue.py b/synapse/federation/transaction_queue.py index bb20f2ebab..7d02afe163 100644 --- a/synapse/federation/transaction_queue.py +++ b/synapse/federation/transaction_queue.py @@ -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, + limiter = yield get_retry_limiter( + destination, + self._clock, + self.store, ) - self._next_txn_id += 1 + with limiter: + self.pending_transactions[destination] = 1 - yield self.transaction_actions.prepare_to_send(transaction) + logger.debug("TX [%s] Persisting transaction...", destination) - logger.debug("TX [%s] Persisted transaction", destination) - logger.info( - "TX [%s] Sending transaction [%s]", - destination, - transaction.transaction_id, - ) + 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 - # 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 + yield self.transaction_actions.prepare_to_send(transaction) + + logger.debug("TX [%s] Persisted transaction", destination) + logger.info( + "TX [%s] Sending transaction [%s]", + destination, + transaction.transaction_id, ) - code = 200 - except HttpResponseException as e: - code = e.code - response = e.response - logger.info("TX [%s] got %d response", destination, code) + # 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.debug("TX [%s] Sent transaction", destination) - logger.debug("TX [%s] Marking as delivered...", destination) + logger.info("TX [%s] got %d response", destination, code) - yield self.transaction_actions.delivered( - transaction, code, response - ) + 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 - ) diff --git a/synapse/util/retryutils.py b/synapse/util/retryutils.py new file mode 100644 index 0000000000..bba524ebd8 --- /dev/null +++ b/synapse/util/retryutils.py @@ -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) |