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

changelog.d/8116.feature

@@ -0,0 +1 @@
+Iteratively encode JSON to avoid blocking the reactor.

synapse/http/server.py

@@ -500,7 +500,7 @@ class RootOptionsRedirectResource(OptionsResource, RootRedirect):
     pass
 
 
-@implementer(interfaces.IPullProducer)
+@implementer(interfaces.IPushProducer)
 class _ByteProducer:
     """
     Iteratively write bytes to the request.
@@ -515,29 +515,40 @@ 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
 
+        self._paused = False
+
+        # 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 coalesced until min_chunk_size is
-        # reached. (This is because JSON encoders produce a very small output
-        # per iteration.)
+            # 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.
@@ -561,6 +572,7 @@ class _ByteProducer:
             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
 
 

tests/rest/client/v1/test_login.py

@@ -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)
 

tests/rest/client/v2_alpha/test_register.py

@@ -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)

tests/storage/test_cleanup_extrems.py

@@ -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(