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Use a producer to stream back responses

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The problem with dumping all of the json response into the Request object at
once is that doing so starts the timeout for the next request to be received:
so if it takes longer than 60s to stream back the response to the client, the
client never gets it.

The correct solution is to use a Producer; then the timeout is only started
once all of the content is sent over the TCP connection.
This commit is contained in:
Richard van der Hoff 2018-08-14 16:13:17 +01:00
parent 4601129c44
commit afcd655ab6
1 changed files with 13 additions and 4 deletions
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17
synapse/http/server.py
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@ -27,6 +27,7 @@ from twisted.internet import defer
from twisted.python import failure
from twisted.web import resource, server
from twisted.web.server import NOT_DONE_YET
from twisted.web.static import NoRangeStaticProducer
from twisted.web.util import redirectTo
import synapse.events
@ -42,6 +43,11 @@ from synapse.util.caches import intern_dict
from synapse.util.logcontext import LoggingContext, PreserveLoggingContext
from synapse.util.metrics import Measure
if PY3:
from io import BytesIO
else:
from cStringIO import StringIO as BytesIO
logger = logging.getLogger(__name__)
HTML_ERROR_TEMPLATE = """<!DOCTYPE html>
@ -413,8 +419,7 @@ def respond_with_json(request, code, json_object, send_cors=False,
return
if pretty_print:
json_bytes = (encode_pretty_printed_json(json_object) + "\n"
).encode("utf-8")
json_bytes = encode_pretty_printed_json(json_object) + b"\n"
else:
if canonical_json or synapse.events.USE_FROZEN_DICTS:
# canonicaljson already encodes to bytes
@ -450,8 +455,12 @@ def respond_with_json_bytes(request, code, json_bytes, send_cors=False,
if send_cors:
set_cors_headers(request)
request.write(json_bytes)
finish_request(request)
# todo: we can almost certainly avoid this copy and encode the json straight into
# the bytesIO, but it would involve faffing around with string->bytes wrappers.
bytes_io = BytesIO(json_bytes)
producer = NoRangeStaticProducer(request, bytes_io)
producer.start()
return NOT_DONE_YET