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Refactor request sending to have better excpetions (#4358)

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* Correctly retry and back off if we get a HTTPerror response

* Refactor request sending to have better excpetions

MatrixFederationHttpClient blindly reraised exceptions to the caller
without differentiating "expected" failures (e.g. connection timeouts
etc) versus more severe problems (e.g. programming errors).

This commit adds a RequestSendFailed exception that is raised when
"expected" failures happen, allowing the TransactionQueue to log them as
warnings while allowing us to log other exceptions as actual exceptions.
This commit is contained in:
Erik Johnston 2019-01-08 11:04:28 +00:00 • committed by Richard van der Hoff
parent 1dcb086f33
commit b970cb0e96
6 changed files with 119 additions and 44 deletions
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13
tests/http/test_fedclient.py
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@ -20,6 +20,7 @@ from twisted.internet.error import ConnectingCancelledError, DNSLookupError
from twisted.web.client import ResponseNeverReceived
from twisted.web.http import HTTPChannel
from synapse.api.errors import RequestSendFailed
from synapse.http.matrixfederationclient import (
MatrixFederationHttpClient,
MatrixFederationRequest,
@ -49,7 +50,8 @@ class FederationClientTests(HomeserverTestCase):
self.pump()
f = self.failureResultOf(d)
self.assertIsInstance(f.value, DNSLookupError)
self.assertIsInstance(f.value, RequestSendFailed)
self.assertIsInstance(f.value.inner_exception, DNSLookupError)
def test_client_never_connect(self):
"""
@ -76,7 +78,11 @@ class FederationClientTests(HomeserverTestCase):
self.reactor.advance(10.5)
f = self.failureResultOf(d)
self.assertIsInstance(f.value, (ConnectingCancelledError, TimeoutError))
self.assertIsInstance(f.value, RequestSendFailed)
self.assertIsInstance(
f.value.inner_exception,
(ConnectingCancelledError, TimeoutError),
)
def test_client_connect_no_response(self):
"""
@ -107,7 +113,8 @@ class FederationClientTests(HomeserverTestCase):
self.reactor.advance(10.5)
f = self.failureResultOf(d)
self.assertIsInstance(f.value, ResponseNeverReceived)
self.assertIsInstance(f.value, RequestSendFailed)
self.assertIsInstance(f.value.inner_exception, ResponseNeverReceived)
def test_client_gets_headers(self):
"""