diff options
Diffstat (limited to 'synapse')
| -rw-r--r-- | synapse/crypto/keyring.py | 239 | ||||
| -rw-r--r-- | synapse/federation/federation_base.py | 4 | ||||
| -rw-r--r-- | synapse/federation/transport/server.py | 4 | ||||
| -rw-r--r-- | synapse/groups/attestations.py | 5 | ||||
| -rw-r--r-- | synapse/http/matrixfederationclient.py | 71 | ||||
| -rw-r--r-- | synapse/rest/client/v1/voip.py | 1 | ||||
| -rw-r--r-- | synapse/rest/key/v2/remote_key_resource.py | 12 | ||||
| -rw-r--r-- | synapse/util/retryutils.py | 60 |
8 files changed, 267 insertions, 129 deletions
diff --git a/synapse/crypto/keyring.py b/synapse/crypto/keyring.py index b2f4cea536..0fd15287e7 100644 --- a/synapse/crypto/keyring.py +++ b/synapse/crypto/keyring.py @@ -15,6 +15,7 @@ # limitations under the License. import logging +from collections import defaultdict import six from six import raise_from @@ -45,6 +46,7 @@ from synapse.api.errors import ( ) from synapse.storage.keys import FetchKeyResult from synapse.util import logcontext, unwrapFirstError +from synapse.util.async_helpers import yieldable_gather_results from synapse.util.logcontext import ( LoggingContext, PreserveLoggingContext, @@ -70,6 +72,9 @@ class VerifyKeyRequest(object): json_object(dict): The JSON object to verify. + minimum_valid_until_ts (int): time at which we require the signing key to + be valid. (0 implies we don't care) + deferred(Deferred[str, str, nacl.signing.VerifyKey]): A deferred (server_name, key_id, verify_key) tuple that resolves when a verify key has been fetched. The deferreds' callbacks are run with no @@ -82,7 +87,8 @@ class VerifyKeyRequest(object): server_name = attr.ib() key_ids = attr.ib() json_object = attr.ib() - deferred = attr.ib() + minimum_valid_until_ts = attr.ib() + deferred = attr.ib(default=attr.Factory(defer.Deferred)) class KeyLookupError(ValueError): @@ -90,14 +96,16 @@ class KeyLookupError(ValueError): class Keyring(object): - def __init__(self, hs): + def __init__(self, hs, key_fetchers=None): self.clock = hs.get_clock() - self._key_fetchers = ( - StoreKeyFetcher(hs), - PerspectivesKeyFetcher(hs), - ServerKeyFetcher(hs), - ) + if key_fetchers is None: + key_fetchers = ( + StoreKeyFetcher(hs), + PerspectivesKeyFetcher(hs), + ServerKeyFetcher(hs), + ) + self._key_fetchers = key_fetchers # map from server name to Deferred. Has an entry for each server with # an ongoing key download; the Deferred completes once the download @@ -106,9 +114,25 @@ class Keyring(object): # These are regular, logcontext-agnostic Deferreds. self.key_downloads = {} - def verify_json_for_server(self, server_name, json_object): + def verify_json_for_server(self, server_name, json_object, validity_time): + """Verify that a JSON object has been signed by a given server + + Args: + server_name (str): name of the server which must have signed this object + + json_object (dict): object to be checked + + validity_time (int): timestamp at which we require the signing key to + be valid. (0 implies we don't care) + + Returns: + Deferred[None]: completes if the the object was correctly signed, otherwise + errbacks with an error + """ + req = server_name, json_object, validity_time + return logcontext.make_deferred_yieldable( - self.verify_json_objects_for_server([(server_name, json_object)])[0] + self.verify_json_objects_for_server((req,))[0] ) def verify_json_objects_for_server(self, server_and_json): @@ -116,10 +140,12 @@ class Keyring(object): necessary. Args: - server_and_json (list): List of pairs of (server_name, json_object) + server_and_json (iterable[Tuple[str, dict, int]): + Iterable of triplets of (server_name, json_object, validity_time) + validity_time is a timestamp at which the signing key must be valid. Returns: - List<Deferred>: for each input pair, a deferred indicating success + List<Deferred[None]>: for each input triplet, a deferred indicating success or failure to verify each json object's signature for the given server_name. The deferreds run their callbacks in the sentinel logcontext. @@ -128,12 +154,12 @@ class Keyring(object): verify_requests = [] handle = preserve_fn(_handle_key_deferred) - def process(server_name, json_object): + def process(server_name, json_object, validity_time): """Process an entry in the request list - Given a (server_name, json_object) pair from the request list, - adds a key request to verify_requests, and returns a deferred which will - complete or fail (in the sentinel context) when verification completes. + Given a (server_name, json_object, validity_time) triplet from the request + list, adds a key request to verify_requests, and returns a deferred which + will complete or fail (in the sentinel context) when verification completes. """ key_ids = signature_ids(json_object, server_name) @@ -144,11 +170,16 @@ class Keyring(object): ) ) - logger.debug("Verifying for %s with key_ids %s", server_name, key_ids) + logger.debug( + "Verifying for %s with key_ids %s, min_validity %i", + server_name, + key_ids, + validity_time, + ) # add the key request to the queue, but don't start it off yet. verify_request = VerifyKeyRequest( - server_name, key_ids, json_object, defer.Deferred() + server_name, key_ids, json_object, validity_time ) verify_requests.append(verify_request) @@ -160,8 +191,8 @@ class Keyring(object): return handle(verify_request) results = [ - process(server_name, json_object) - for server_name, json_object in server_and_json + process(server_name, json_object, validity_time) + for server_name, json_object, validity_time in server_and_json ] if verify_requests: @@ -298,8 +329,12 @@ class Keyring(object): verify_request.deferred.errback( SynapseError( 401, - "No key for %s with id %s" - % (verify_request.server_name, verify_request.key_ids), + "No key for %s with ids in %s (min_validity %i)" + % ( + verify_request.server_name, + verify_request.key_ids, + verify_request.minimum_valid_until_ts, + ), Codes.UNAUTHORIZED, ) ) @@ -323,18 +358,28 @@ class Keyring(object): Args: fetcher (KeyFetcher): fetcher to use to fetch the keys remaining_requests (set[VerifyKeyRequest]): outstanding key requests. - Any successfully-completed requests will be reomved from the list. + Any successfully-completed requests will be removed from the list. """ - # dict[str, set(str)]: keys to fetch for each server - missing_keys = {} + # dict[str, dict[str, int]]: keys to fetch. + # server_name -> key_id -> min_valid_ts + missing_keys = defaultdict(dict) + for verify_request in remaining_requests: # any completed requests should already have been removed assert not verify_request.deferred.called - missing_keys.setdefault(verify_request.server_name, set()).update( - verify_request.key_ids - ) + keys_for_server = missing_keys[verify_request.server_name] - results = yield fetcher.get_keys(missing_keys.items()) + for key_id in verify_request.key_ids: + # If we have several requests for the same key, then we only need to + # request that key once, but we should do so with the greatest + # min_valid_until_ts of the requests, so that we can satisfy all of + # the requests. + keys_for_server[key_id] = max( + keys_for_server.get(key_id, -1), + verify_request.minimum_valid_until_ts + ) + + results = yield fetcher.get_keys(missing_keys) completed = list() for verify_request in remaining_requests: @@ -344,25 +389,34 @@ class Keyring(object): # complete this VerifyKeyRequest. result_keys = results.get(server_name, {}) for key_id in verify_request.key_ids: - key = result_keys.get(key_id) - if key: - with PreserveLoggingContext(): - verify_request.deferred.callback( - (server_name, key_id, key.verify_key) - ) - completed.append(verify_request) - break + fetch_key_result = result_keys.get(key_id) + if not fetch_key_result: + # we didn't get a result for this key + continue + + if ( + fetch_key_result.valid_until_ts + < verify_request.minimum_valid_until_ts + ): + # key was not valid at this point + continue + + with PreserveLoggingContext(): + verify_request.deferred.callback( + (server_name, key_id, fetch_key_result.verify_key) + ) + completed.append(verify_request) + break remaining_requests.difference_update(completed) class KeyFetcher(object): - def get_keys(self, server_name_and_key_ids): + def get_keys(self, keys_to_fetch): """ Args: - server_name_and_key_ids (iterable[Tuple[str, iterable[str]]]): - list of (server_name, iterable[key_id]) tuples to fetch keys for - Note that the iterables may be iterated more than once. + keys_to_fetch (dict[str, dict[str, int]]): + the keys to be fetched. server_name -> key_id -> min_valid_ts Returns: Deferred[dict[str, dict[str, synapse.storage.keys.FetchKeyResult|None]]]: @@ -378,13 +432,15 @@ class StoreKeyFetcher(KeyFetcher): self.store = hs.get_datastore() @defer.inlineCallbacks - def get_keys(self, server_name_and_key_ids): + def get_keys(self, keys_to_fetch): """see KeyFetcher.get_keys""" + keys_to_fetch = ( (server_name, key_id) - for server_name, key_ids in server_name_and_key_ids - for key_id in key_ids + for server_name, keys_for_server in keys_to_fetch.items() + for key_id in keys_for_server.keys() ) + res = yield self.store.get_server_verify_keys(keys_to_fetch) keys = {} for (server_name, key_id), key in res.items(): @@ -508,14 +564,14 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): self.perspective_servers = self.config.perspectives @defer.inlineCallbacks - def get_keys(self, server_name_and_key_ids): + def get_keys(self, keys_to_fetch): """see KeyFetcher.get_keys""" @defer.inlineCallbacks def get_key(perspective_name, perspective_keys): try: result = yield self.get_server_verify_key_v2_indirect( - server_name_and_key_ids, perspective_name, perspective_keys + keys_to_fetch, perspective_name, perspective_keys ) defer.returnValue(result) except KeyLookupError as e: @@ -549,13 +605,15 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): @defer.inlineCallbacks def get_server_verify_key_v2_indirect( - self, server_names_and_key_ids, perspective_name, perspective_keys + self, keys_to_fetch, perspective_name, perspective_keys ): """ Args: - server_names_and_key_ids (iterable[Tuple[str, iterable[str]]]): - list of (server_name, iterable[key_id]) tuples to fetch keys for + keys_to_fetch (dict[str, dict[str, int]]): + the keys to be fetched. server_name -> key_id -> min_valid_ts + perspective_name (str): name of the notary server to query for the keys + perspective_keys (dict[str, VerifyKey]): map of key_id->key for the notary server @@ -569,12 +627,10 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): """ logger.info( "Requesting keys %s from notary server %s", - server_names_and_key_ids, + keys_to_fetch.items(), perspective_name, ) - # TODO(mark): Set the minimum_valid_until_ts to that needed by - # the events being validated or the current time if validating - # an incoming request. + try: query_response = yield self.client.post_json( destination=perspective_name, @@ -582,12 +638,12 @@ class PerspectivesKeyFetcher(BaseV2KeyFetcher): data={ u"server_keys": { server_name: { - key_id: {u"minimum_valid_until_ts": 0} for key_id in key_ids + key_id: {u"minimum_valid_until_ts": min_valid_ts} + for key_id, min_valid_ts in server_keys.items() } - for server_name, key_ids in server_names_and_key_ids + for server_name, server_keys in keys_to_fetch.items() } }, - long_retries=True, ) except (NotRetryingDestination, RequestSendFailed) as e: raise_from(KeyLookupError("Failed to connect to remote server"), e) @@ -693,34 +749,54 @@ class ServerKeyFetcher(BaseV2KeyFetcher): self.clock = hs.get_clock() self.client = hs.get_http_client() - @defer.inlineCallbacks - def get_keys(self, server_name_and_key_ids): - """see KeyFetcher.get_keys""" - results = yield logcontext.make_deferred_yieldable( - defer.gatherResults( - [ - run_in_background( - self.get_server_verify_key_v2_direct, server_name, key_ids - ) - for server_name, key_ids in server_name_and_key_ids - ], - consumeErrors=True, - ).addErrback(unwrapFirstError) - ) + def get_keys(self, keys_to_fetch): + """ + Args: + keys_to_fetch (dict[str, iterable[str]]): + the keys to be fetched. server_name -> key_ids - merged = {} - for result in results: - merged.update(result) + Returns: + Deferred[dict[str, dict[str, synapse.storage.keys.FetchKeyResult|None]]]: + map from server_name -> key_id -> FetchKeyResult + """ + + results = {} - defer.returnValue( - {server_name: keys for server_name, keys in merged.items() if keys} + @defer.inlineCallbacks + def get_key(key_to_fetch_item): + server_name, key_ids = key_to_fetch_item + try: + keys = yield self.get_server_verify_key_v2_direct(server_name, key_ids) + results[server_name] = keys + except KeyLookupError as e: + logger.warning( + "Error looking up keys %s from %s: %s", key_ids, server_name, e + ) + except Exception: + logger.exception("Error getting keys %s from %s", key_ids, server_name) + + return yieldable_gather_results(get_key, keys_to_fetch.items()).addCallback( + lambda _: results ) @defer.inlineCallbacks def get_server_verify_key_v2_direct(self, server_name, key_ids): + """ + + Args: + server_name (str): + key_ids (iterable[str]): + + Returns: + Deferred[dict[str, FetchKeyResult]]: map from key ID to lookup result + + Raises: + KeyLookupError if there was a problem making the lookup + """ keys = {} # type: dict[str, FetchKeyResult] for requested_key_id in key_ids: + # we may have found this key as a side-effect of asking for another. if requested_key_id in keys: continue @@ -731,6 +807,19 @@ class ServerKeyFetcher(BaseV2KeyFetcher): path="/_matrix/key/v2/server/" + urllib.parse.quote(requested_key_id), ignore_backoff=True, + + # we only give the remote server 10s to respond. It should be an + # easy request to handle, so if it doesn't reply within 10s, it's + # probably not going to. + # + # Furthermore, when we are acting as a notary server, we cannot + # wait all day for all of the origin servers, as the requesting + # server will otherwise time out before we can respond. + # + # (Note that get_json may make 4 attempts, so this can still take + # almost 45 seconds to fetch the headers, plus up to another 60s to + # read the response). + timeout=10000, ) except (NotRetryingDestination, RequestSendFailed) as e: raise_from(KeyLookupError("Failed to connect to remote server"), e) @@ -755,7 +844,7 @@ class ServerKeyFetcher(BaseV2KeyFetcher): ) keys.update(response_keys) - defer.returnValue({server_name: keys}) + defer.returnValue(keys) @defer.inlineCallbacks diff --git a/synapse/federation/federation_base.py b/synapse/federation/federation_base.py index cffa831d80..4b38f7c759 100644 --- a/synapse/federation/federation_base.py +++ b/synapse/federation/federation_base.py @@ -265,7 +265,7 @@ def _check_sigs_on_pdus(keyring, room_version, pdus): ] more_deferreds = keyring.verify_json_objects_for_server([ - (p.sender_domain, p.redacted_pdu_json) + (p.sender_domain, p.redacted_pdu_json, 0) for p in pdus_to_check_sender ]) @@ -298,7 +298,7 @@ def _check_sigs_on_pdus(keyring, room_version, pdus): ] more_deferreds = keyring.verify_json_objects_for_server([ - (get_domain_from_id(p.pdu.event_id), p.redacted_pdu_json) + (get_domain_from_id(p.pdu.event_id), p.redacted_pdu_json, 0) for p in pdus_to_check_event_id ]) diff --git a/synapse/federation/transport/server.py b/synapse/federation/transport/server.py index d0efc4e0d3..0db8858cf1 100644 --- a/synapse/federation/transport/server.py +++ b/synapse/federation/transport/server.py @@ -94,6 +94,7 @@ class NoAuthenticationError(AuthenticationError): class Authenticator(object): def __init__(self, hs): + self._clock = hs.get_clock() self.keyring = hs.get_keyring() self.server_name = hs.hostname self.store = hs.get_datastore() @@ -102,6 +103,7 @@ class Authenticator(object): # A method just so we can pass 'self' as the authenticator to the Servlets @defer.inlineCallbacks def authenticate_request(self, request, content): + now = self._clock.time_msec() json_request = { "method": request.method.decode('ascii'), "uri": request.uri.decode('ascii'), @@ -138,7 +140,7 @@ class Authenticator(object): 401, "Missing Authorization headers", Codes.UNAUTHORIZED, ) - yield self.keyring.verify_json_for_server(origin, json_request) + yield self.keyring.verify_json_for_server(origin, json_request, now) logger.info("Request from %s", origin) request.authenticated_entity = origin diff --git a/synapse/groups/attestations.py b/synapse/groups/attestations.py index 786149be65..fa6b641ee1 100644 --- a/synapse/groups/attestations.py +++ b/synapse/groups/attestations.py @@ -97,10 +97,11 @@ class GroupAttestationSigning(object): # TODO: We also want to check that *new* attestations that people give # us to store are valid for at least a little while. - if valid_until_ms < self.clock.time_msec(): + now = self.clock.time_msec() + if valid_until_ms < now: raise SynapseError(400, "Attestation expired") - yield self.keyring.verify_json_for_server(server_name, attestation) + yield self.keyring.verify_json_for_server(server_name, attestation, now) def create_attestation(self, group_id, user_id): """Create an attestation for the group_id and user_id with default diff --git a/synapse/http/matrixfederationclient.py b/synapse/http/matrixfederationclient.py index 8197619a78..663ea72a7a 100644 --- a/synapse/http/matrixfederationclient.py +++ b/synapse/http/matrixfederationclient.py @@ -285,7 +285,24 @@ class MatrixFederationHttpClient(object): request (MatrixFederationRequest): details of request to be sent timeout (int|None): number of milliseconds to wait for the response headers - (including connecting to the server). 60s by default. + (including connecting to the server), *for each attempt*. + 60s by default. + + long_retries (bool): whether to use the long retry algorithm. + + The regular retry algorithm makes 4 attempts, with intervals + [0.5s, 1s, 2s]. + + The long retry algorithm makes 11 attempts, with intervals + [4s, 16s, 60s, 60s, ...] + + Both algorithms add -20%/+40% jitter to the retry intervals. + + Note that the above intervals are *in addition* to the time spent + waiting for the request to complete (up to `timeout` ms). + + NB: the long retry algorithm takes over 20 minutes to complete, with + a default timeout of 60s! ignore_backoff (bool): true to ignore the historical backoff data and try the request anyway. @@ -566,10 +583,14 @@ class MatrixFederationHttpClient(object): the request body. This will be encoded as JSON. json_data_callback (callable): A callable returning the dict to use as the request body. - long_retries (bool): A boolean that indicates whether we should - retry for a short or long time. - timeout(int): How long to try (in ms) the destination for before - giving up. None indicates no timeout. + + long_retries (bool): whether to use the long retry algorithm. See + docs on _send_request for details. + + timeout (int|None): number of milliseconds to wait for the response headers + (including connecting to the server), *for each attempt*. + self._default_timeout (60s) by default. + ignore_backoff (bool): true to ignore the historical backoff data and try the request anyway. backoff_on_404 (bool): True if we should count a 404 response as @@ -627,15 +648,22 @@ class MatrixFederationHttpClient(object): Args: destination (str): The remote server to send the HTTP request to. + path (str): The HTTP path. + data (dict): A dict containing the data that will be used as the request body. This will be encoded as JSON. - long_retries (bool): A boolean that indicates whether we should - retry for a short or long time. - timeout(int): How long to try (in ms) the destination for before - giving up. None indicates no timeout. + + long_retries (bool): whether to use the long retry algorithm. See + docs on _send_request for details. + + timeout (int|None): number of milliseconds to wait for the response headers + (including connecting to the server), *for each attempt*. + self._default_timeout (60s) by default. + ignore_backoff (bool): true to ignore the historical backoff data and try the request anyway. + args (dict): query params Returns: Deferred[dict|list]: Succeeds when we get a 2xx HTTP response. The @@ -686,14 +714,19 @@ class MatrixFederationHttpClient(object): Args: destination (str): The remote server to send the HTTP request to. + path (str): The HTTP path. + args (dict|None): A dictionary used to create query strings, defaults to None. - timeout (int): How long to try (in ms) the destination for before - giving up. None indicates no timeout and that the request will - be retried. + + timeout (int|None): number of milliseconds to wait for the response headers + (including connecting to the server), *for each attempt*. + self._default_timeout (60s) by default. + ignore_backoff (bool): true to ignore the historical backoff data and try the request anyway. + try_trailing_slash_on_400 (bool): True if on a 400 M_UNRECOGNIZED response we should try appending a trailing slash to the end of the request. Workaround for #3622 in Synapse <= v0.99.3. @@ -742,12 +775,18 @@ class MatrixFederationHttpClient(object): destination (str): The remote server to send the HTTP request to. path (str): The HTTP path. - long_retries (bool): A boolean that indicates whether we should - retry for a short or long time. - timeout(int): How long to try (in ms) the destination for before - giving up. None indicates no timeout. + + long_retries (bool): whether to use the long retry algorithm. See + docs on _send_request for details. + + timeout (int|None): number of milliseconds to wait for the response headers + (including connecting to the server), *for each attempt*. + self._default_timeout (60s) by default. + ignore_backoff (bool): true to ignore the historical backoff data and try the request anyway. + + args (dict): query params Returns: Deferred[dict|list]: Succeeds when we get a 2xx HTTP response. The result will be the decoded JSON body. diff --git a/synapse/rest/client/v1/voip.py b/synapse/rest/client/v1/voip.py index 0975df84cf..6381049210 100644 --- a/synapse/rest/client/v1/voip.py +++ b/synapse/rest/client/v1/voip.py @@ -29,6 +29,7 @@ class VoipRestServlet(RestServlet): def __init__(self, hs): super(VoipRestServlet, self).__init__() self.hs = hs + self.auth = hs.get_auth() @defer.inlineCallbacks def on_GET(self, request): diff --git a/synapse/rest/key/v2/remote_key_resource.py b/synapse/rest/key/v2/remote_key_resource.py index 21c3c807b9..8a730bbc35 100644 --- a/synapse/rest/key/v2/remote_key_resource.py +++ b/synapse/rest/key/v2/remote_key_resource.py @@ -20,7 +20,7 @@ from twisted.web.resource import Resource from twisted.web.server import NOT_DONE_YET from synapse.api.errors import Codes, SynapseError -from synapse.crypto.keyring import KeyLookupError, ServerKeyFetcher +from synapse.crypto.keyring import ServerKeyFetcher from synapse.http.server import respond_with_json_bytes, wrap_json_request_handler from synapse.http.servlet import parse_integer, parse_json_object_from_request @@ -215,15 +215,7 @@ class RemoteKey(Resource): json_results.add(bytes(result["key_json"])) if cache_misses and query_remote_on_cache_miss: - for server_name, key_ids in cache_misses.items(): - try: - yield self.fetcher.get_server_verify_key_v2_direct( - server_name, key_ids - ) - except KeyLookupError as e: - logger.info("Failed to fetch key: %s", e) - except Exception: - logger.exception("Failed to get key for %r", server_name) + yield self.fetcher.get_keys(cache_misses) yield self.query_keys( request, query, query_remote_on_cache_miss=False ) diff --git a/synapse/util/retryutils.py b/synapse/util/retryutils.py index 26cce7d197..f6dfa77d8f 100644 --- a/synapse/util/retryutils.py +++ b/synapse/util/retryutils.py @@ -46,8 +46,7 @@ class NotRetryingDestination(Exception): @defer.inlineCallbacks -def get_retry_limiter(destination, clock, store, ignore_backoff=False, - **kwargs): +def get_retry_limiter(destination, clock, store, ignore_backoff=False, **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 @@ -60,8 +59,7 @@ def get_retry_limiter(destination, clock, store, ignore_backoff=False, clock (synapse.util.clock): timing source store (synapse.storage.transactions.TransactionStore): datastore ignore_backoff (bool): true to ignore the historical backoff data and - try the request anyway. We will still update the next - retry_interval on success/failure. + try the request anyway. We will still reset the retry_interval on success. Example usage: @@ -75,13 +73,12 @@ def get_retry_limiter(destination, clock, store, ignore_backoff=False, """ retry_last_ts, retry_interval = (0, 0) - retry_timings = yield store.get_destination_retry_timings( - destination - ) + 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"] + retry_timings["retry_last_ts"], + retry_timings["retry_interval"], ) now = int(clock.time_msec()) @@ -93,22 +90,31 @@ def get_retry_limiter(destination, clock, store, ignore_backoff=False, destination=destination, ) + # if we are ignoring the backoff data, we should also not increment the backoff + # when we get another failure - otherwise a server can very quickly reach the + # maximum backoff even though it might only have been down briefly + backoff_on_failure = not ignore_backoff + defer.returnValue( RetryDestinationLimiter( - destination, - clock, - store, - retry_interval, - **kwargs + destination, clock, store, retry_interval, backoff_on_failure, **kwargs ) ) class RetryDestinationLimiter(object): - def __init__(self, destination, clock, store, retry_interval, - min_retry_interval=10 * 60 * 1000, - max_retry_interval=24 * 60 * 60 * 1000, - multiplier_retry_interval=5, backoff_on_404=False): + def __init__( + self, + destination, + clock, + store, + retry_interval, + min_retry_interval=10 * 60 * 1000, + max_retry_interval=24 * 60 * 60 * 1000, + multiplier_retry_interval=5, + backoff_on_404=False, + backoff_on_failure=True, + ): """Marks the destination as "down" if an exception is thrown in the context, except for CodeMessageException with code < 500. @@ -128,6 +134,9 @@ class RetryDestinationLimiter(object): multiplier_retry_interval (int): The multiplier to use to increase the retry interval after a failed request. backoff_on_404 (bool): Back off if we get a 404 + + backoff_on_failure (bool): set to False if we should not increase the + retry interval on a failure. """ self.clock = clock self.store = store @@ -138,6 +147,7 @@ class RetryDestinationLimiter(object): self.max_retry_interval = max_retry_interval self.multiplier_retry_interval = multiplier_retry_interval self.backoff_on_404 = backoff_on_404 + self.backoff_on_failure = backoff_on_failure def __enter__(self): pass @@ -173,10 +183,13 @@ class RetryDestinationLimiter(object): if not self.retry_interval: return - logger.debug("Connection to %s was successful; clearing backoff", - self.destination) + logger.debug( + "Connection to %s was successful; clearing backoff", self.destination + ) retry_last_ts = 0 self.retry_interval = 0 + elif not self.backoff_on_failure: + return else: # We couldn't connect. if self.retry_interval: @@ -190,7 +203,10 @@ class RetryDestinationLimiter(object): logger.info( "Connection to %s was unsuccessful (%s(%s)); backoff now %i", - self.destination, exc_type, exc_val, self.retry_interval + self.destination, + exc_type, + exc_val, + self.retry_interval, ) retry_last_ts = int(self.clock.time_msec()) @@ -201,9 +217,7 @@ class RetryDestinationLimiter(object): self.destination, retry_last_ts, self.retry_interval ) except Exception: - logger.exception( - "Failed to store destination_retry_timings", - ) + logger.exception("Failed to store destination_retry_timings") # we deliberately do this in the background. synapse.util.logcontext.run_in_background(store_retry_timings) |