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Switch the JSON byte producer from a pull to a push producer. (#8116)

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Patrick Cloke 2020-08-19 08:07:57 -04:00 committed by GitHub
parent cfeb37f039
commit f594e434c3
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5 changed files with 52 additions and 45 deletions
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1
changelog.d/8116.feature Normal file
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@ -0,0 +1 @@
Iteratively encode JSON to avoid blocking the reactor.

73
synapse/http/server.py
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@ -500,7 +500,7 @@ class RootOptionsRedirectResource(OptionsResource, RootRedirect):
pass
@implementer(interfaces.IPullProducer)
@implementer(interfaces.IPushProducer)
class _ByteProducer:
"""
Iteratively write bytes to the request.
@ -515,52 +515,64 @@ class _ByteProducer:
):
self._request = request
self._iterator = iterator
self._paused = False
def start(self) -> None:
self._request.registerProducer(self, False)
# Register the producer and start producing data.
self._request.registerProducer(self, True)
self.resumeProducing()
def _send_data(self, data: List[bytes]) -> None:
"""
Send a list of strings as a response to the request.
Send a list of bytes as a chunk of a response.
"""
if not data:
return
self._request.write(b"".join(data))
def pauseProducing(self) -> None:
self._paused = True
def resumeProducing(self) -> None:
# We've stopped producing in the meantime (note that this might be
# re-entrant after calling write).
if not self._request:
return
# Get the next chunk and write it to the request.
#
# The output of the JSON encoder is coalesced until min_chunk_size is
# reached. (This is because JSON encoders produce a very small output
# per iteration.)
#
# Note that buffer stores a list of bytes (instead of appending to
# bytes) to hopefully avoid many allocations.
buffer = []
buffered_bytes = 0
while buffered_bytes < self.min_chunk_size:
try:
data = next(self._iterator)
buffer.append(data)
buffered_bytes += len(data)
except StopIteration:
# The entire JSON object has been serialized, write any
# remaining data, finalize the producer and the request, and
# clean-up any references.
self._send_data(buffer)
self._request.unregisterProducer()
self._request.finish()
self.stopProducing()
return
self._paused = False
self._send_data(buffer)
# Write until there's backpressure telling us to stop.
while not self._paused:
# Get the next chunk and write it to the request.
#
# The output of the JSON encoder is buffered and coalesced until
# min_chunk_size is reached. This is because JSON encoders produce
# very small output per iteration and the Request object converts
# each call to write() to a separate chunk. Without this there would
# be an explosion in bytes written (e.g. b"{" becoming "1\r\n{\r\n").
#
# Note that buffer stores a list of bytes (instead of appending to
# bytes) to hopefully avoid many allocations.
buffer = []
buffered_bytes = 0
while buffered_bytes < self.min_chunk_size:
try:
data = next(self._iterator)
buffer.append(data)
buffered_bytes += len(data)
except StopIteration:
# The entire JSON object has been serialized, write any
# remaining data, finalize the producer and the request, and
# clean-up any references.
self._send_data(buffer)
self._request.unregisterProducer()
self._request.finish()
self.stopProducing()
return
self._send_data(buffer)
def stopProducing(self) -> None:
# Clear a circular reference.
self._request = None
@ -620,8 +632,7 @@ def respond_with_json(
if send_cors:
set_cors_headers(request)
producer = _ByteProducer(request, encoder(json_object))
producer.start()
_ByteProducer(request, encoder(json_object))
return NOT_DONE_YET

16
tests/rest/client/v1/test_login.py
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@ -62,8 +62,7 @@ class LoginRestServletTestCase(unittest.HomeserverTestCase):
"identifier": {"type": "m.id.user", "user": "kermit" + str(i)},
"password": "monkey",
}
request_data = json.dumps(params)
request, channel = self.make_request(b"POST", LOGIN_URL, request_data)
request, channel = self.make_request(b"POST", LOGIN_URL, params)
self.render(request)
if i == 5:
@ -76,14 +75,13 @@ class LoginRestServletTestCase(unittest.HomeserverTestCase):
# than 1min.
self.assertTrue(retry_after_ms < 6000)
self.reactor.advance(retry_after_ms / 1000.0)
self.reactor.advance(retry_after_ms / 1000.0 + 1.0)
params = {
"type": "m.login.password",
"identifier": {"type": "m.id.user", "user": "kermit" + str(i)},
"password": "monkey",
}
request_data = json.dumps(params)
request, channel = self.make_request(b"POST", LOGIN_URL, params)
self.render(request)
@ -111,8 +109,7 @@ class LoginRestServletTestCase(unittest.HomeserverTestCase):
"identifier": {"type": "m.id.user", "user": "kermit"},
"password": "monkey",
}
request_data = json.dumps(params)
request, channel = self.make_request(b"POST", LOGIN_URL, request_data)
request, channel = self.make_request(b"POST", LOGIN_URL, params)
self.render(request)
if i == 5:
@ -132,7 +129,6 @@ class LoginRestServletTestCase(unittest.HomeserverTestCase):
"identifier": {"type": "m.id.user", "user": "kermit"},
"password": "monkey",
}
request_data = json.dumps(params)
request, channel = self.make_request(b"POST", LOGIN_URL, params)
self.render(request)
@ -160,8 +156,7 @@ class LoginRestServletTestCase(unittest.HomeserverTestCase):
"identifier": {"type": "m.id.user", "user": "kermit"},
"password": "notamonkey",
}
request_data = json.dumps(params)
request, channel = self.make_request(b"POST", LOGIN_URL, request_data)
request, channel = self.make_request(b"POST", LOGIN_URL, params)
self.render(request)
if i == 5:
@ -174,14 +169,13 @@ class LoginRestServletTestCase(unittest.HomeserverTestCase):
# than 1min.
self.assertTrue(retry_after_ms < 6000)
self.reactor.advance(retry_after_ms / 1000.0)
self.reactor.advance(retry_after_ms / 1000.0 + 1.0)
params = {
"type": "m.login.password",
"identifier": {"type": "m.id.user", "user": "kermit"},
"password": "notamonkey",
}
request_data = json.dumps(params)
request, channel = self.make_request(b"POST", LOGIN_URL, params)
self.render(request)

4
tests/rest/client/v2_alpha/test_register.py
View File

@ -160,7 +160,7 @@ class RegisterRestServletTestCase(unittest.HomeserverTestCase):
else:
self.assertEquals(channel.result["code"], b"200", channel.result)
self.reactor.advance(retry_after_ms / 1000.0)
self.reactor.advance(retry_after_ms / 1000.0 + 1.0)
request, channel = self.make_request(b"POST", self.url + b"?kind=guest", b"{}")
self.render(request)
@ -186,7 +186,7 @@ class RegisterRestServletTestCase(unittest.HomeserverTestCase):
else:
self.assertEquals(channel.result["code"], b"200", channel.result)
self.reactor.advance(retry_after_ms / 1000.0)
self.reactor.advance(retry_after_ms / 1000.0 + 1.0)
request, channel = self.make_request(b"POST", self.url + b"?kind=guest", b"{}")
self.render(request)

3
tests/storage/test_cleanup_extrems.py
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@ -353,6 +353,7 @@ class CleanupExtremDummyEventsTestCase(HomeserverTestCase):
self.event_creator_handler._rooms_to_exclude_from_dummy_event_insertion[
"3"
] = 300000
self.event_creator_handler._expire_rooms_to_exclude_from_dummy_event_insertion()
# All entries within time frame
self.assertEqual(
@ -362,7 +363,7 @@ class CleanupExtremDummyEventsTestCase(HomeserverTestCase):
3,
)
# Oldest room to expire
self.pump(1)
self.pump(1.01)
self.event_creator_handler._expire_rooms_to_exclude_from_dummy_event_insertion()
self.assertEqual(
len(