Pass around the reactor explicitly (#3385)

synapse/util/file_consumer.py

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from twisted.internet import threads, reactor
+from twisted.internet import threads
 
 from synapse.util.logcontext import make_deferred_yieldable, run_in_background
 
@@ -27,6 +27,7 @@ class BackgroundFileConsumer(object):
     Args:
         file_obj (file): The file like object to write to. Closed when
             finished.
+        reactor (twisted.internet.reactor): the Twisted reactor to use
     """
 
     # For PushProducers pause if we have this many unwritten slices
@@ -34,9 +35,11 @@ class BackgroundFileConsumer(object):
     # And resume once the size of the queue is less than this
     _RESUME_ON_QUEUE_SIZE = 2
 
-    def __init__(self, file_obj):
+    def __init__(self, file_obj, reactor):
         self._file_obj = file_obj
 
+        self._reactor = reactor
+
         # Producer we're registered with
         self._producer = None
 
@@ -71,7 +74,10 @@ class BackgroundFileConsumer(object):
         self._producer = producer
         self.streaming = streaming
         self._finished_deferred = run_in_background(
-            threads.deferToThread, self._writer
+            threads.deferToThreadPool,
+            self._reactor,
+            self._reactor.getThreadPool(),
+            self._writer,
         )
         if not streaming:
             self._producer.resumeProducing()
@@ -109,7 +115,7 @@ class BackgroundFileConsumer(object):
                 # producer.
                 if self._producer and self._paused_producer:
                     if self._bytes_queue.qsize() <= self._RESUME_ON_QUEUE_SIZE:
-                        reactor.callFromThread(self._resume_paused_producer)
+                        self._reactor.callFromThread(self._resume_paused_producer)
 
                 bytes = self._bytes_queue.get()
 
@@ -121,7 +127,7 @@ class BackgroundFileConsumer(object):
                 # If its a pull producer then we need to explicitly ask for
                 # more stuff.
                 if not self.streaming and self._producer:
-                    reactor.callFromThread(self._producer.resumeProducing)
+                    self._reactor.callFromThread(self._producer.resumeProducing)
         except Exception as e:
             self._write_exception = e
             raise