diff options
Diffstat (limited to '')
| -rw-r--r-- | synapse/http/matrixfederationclient.py | 103 |
1 files changed, 71 insertions, 32 deletions
diff --git a/synapse/http/matrixfederationclient.py b/synapse/http/matrixfederationclient.py index fc8cf92067..9019c8791a 100644 --- a/synapse/http/matrixfederationclient.py +++ b/synapse/http/matrixfederationclient.py @@ -189,6 +189,55 @@ class MatrixFederationHttpClient(object): self._cooperator = Cooperator(scheduler=schedule) @defer.inlineCallbacks + def _send_request_with_optional_trailing_slash( + request, + try_trailing_slash_on_400=False, + backoff_on_404=False, + **kwargs, + ): + """Wrapper for _send_request which can optionally retry the request + upon receiving a combination of a 400 HTTP response code and a + 'M_UNRECOGNIZED' errcode. This is a workaround for Synapse <=v0.99.2 + due to #3622. + + Args: + request + try_trailing_slash_on_400 (bool): Whether on receiving a 400 + 'M_UNRECOGNIZED' from the server to retry the request with a + trailing slash appended to the request path. + backoff_on_404 (bool): Whether to backoff on 404 when making a + request with a trailing slash (only affects request if + try_trailing_slash_on_400 is True). + kwargs (Dict): A dictionary of arguments to pass to + `_send_request()`. + + Returns: + Deferred[twisted.web.client.Response]: resolves with the HTTP + response object on success. + """ + response = self._send_request(**kwargs) + + if not try_trailing_slash_on_400: + defer.returnValue(response) + + # Check if it's necessary to retry with a trailing slash + body = yield _handle_json_response( + self.hs.get_reactor(), self.default_timeout, request, response, + ) + + # Retry with a trailing slash if we received a 400 with + # 'M_UNRECOGNIZED' which some endpoints can return when omitting a + # trailing slash on Synapse <=v0.99.2. + if (response.code == 400 and body.get("errcode") == "M_UNRECOGNIZED"): + # Enable backoff if initially disabled + kwargs["backoff_on_404"] = backoff_on_404 + + kwargs["path"] += "/" + response = yield self._send_request(**kwargs) + + defer.returnValue(response) + + @defer.inlineCallbacks def _send_request( self, request, @@ -474,7 +523,7 @@ class MatrixFederationHttpClient(object): long_retries=False, timeout=None, ignore_backoff=False, backoff_on_404=False, - try_trailing_slash_on_404=False): + try_trailing_slash_on_400=False): """ Sends the specifed json data using PUT Args: @@ -495,10 +544,11 @@ class MatrixFederationHttpClient(object): backoff_on_404 (bool): True if we should count a 404 response as a failure of the server (and should therefore back off future requests). - try_trailing_slash_on_404 (bool): True if on a 404 response we - should try appending a trailing slash to the end of the request. - Workaround for #3622 in Synapse <0.99.2. This will be attempted - before backing off if backing off has been enabled. + 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 <=v0.99.2. This + will be attempted before backing off if backing off has been + enabled. Returns: Deferred[dict|list]: Succeeds when we get a 2xx HTTP response. The @@ -528,21 +578,21 @@ class MatrixFederationHttpClient(object): "long_retries": long_retries, "timeout": timeout, "ignore_backoff": ignore_backoff, - # Do not backoff on the initial request if we're trying with trailing slashes - # Otherwise we may end up waiting to contact a server that is actually up - "backoff_on_404": False if try_trailing_slash_on_404 else backoff_on_404, + # Do not backoff on the initial request if we're trying again with + # trailing slashes Otherwise we may end up waiting to contact a + # server that is actually up + "backoff_on_404": False if try_trailing_slash_on_400 else backoff_on_404, } - response = yield self._send_request(**send_request_args) + response = yield self._send_request_with_optional_trailing_slash( + request, try_trailing_slash_on_400, backoff_on_404, **send_request_args, + ) - # If enabled, retry with a trailing slash if we received a 404 - if try_trailing_slash_on_404 and response.code == 404: + # If enabled, retry with a trailing slash if we received a 400 + if try_trailing_slash_on_400 and response.code == 400: args["path"] += "/" - # Re-enable backoff if enabled - send_request_args["backoff_on_404"] = backoff_on_404 - - response = yield self.get_json(**send_request_args) + response = yield self._send_request(**send_request_args) body = yield _handle_json_response( self.hs.get_reactor(), self.default_timeout, request, response, @@ -610,7 +660,7 @@ class MatrixFederationHttpClient(object): @defer.inlineCallbacks def get_json(self, destination, path, args=None, retry_on_dns_fail=True, timeout=None, ignore_backoff=False, - try_trailing_slash_on_404=False): + try_trailing_slash_on_400=False): """ GETs some json from the given host homeserver and path Args: @@ -624,9 +674,9 @@ class MatrixFederationHttpClient(object): be retried. ignore_backoff (bool): true to ignore the historical backoff data and try the request anyway. - try_trailing_slash_on_404 (bool): True if on a 404 response we - should try appending a trailing slash to the end of the - request. Workaround for #3622 in Synapse <0.99.2. + 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 <=v0.99.2. Returns: Deferred[dict|list]: Succeeds when we get a 2xx HTTP response. The result will be the decoded JSON body. @@ -659,21 +709,10 @@ class MatrixFederationHttpClient(object): "ignore_backoff": ignore_backoff, } - response = yield self._send_request(**send_request_args) - - body = yield _handle_json_response( - self.hs.get_reactor(), self.default_timeout, request, response, + response = yield self._send_request_with_optional_trailing_slash( + request, try_trailing_slash_on_400, False, **send_request_args, ) - # If enabled, retry with a trailing slash if we received a 404 - # or if a 400 with "M_UNRECOGNIZED" which some endpoints return - if (try_trailing_slash_on_404 and - (response.code == 404 - or (response.code == 400 - and body.get("errcode") == "M_UNRECOGNIZED"))): - args["path"] += "/" - response = yield self._send_request(**send_request_args) - defer.returnValue(body) @defer.inlineCallbacks |