clean up imports

src/wormhole_transit_relay/test/test_transit_server.py

@@ -1,10 +1,16 @@
 from __future__ import print_function, unicode_literals
-import base64
 from binascii import hexlify
 from twisted.trial import unittest
-from twisted.test import proto_helpers
+from twisted.test import iosim
-from twisted.internet.defer import inlineCallbacks
+from autobahn.twisted.websocket import (
-from twisted.internet.task import deferLater
+    WebSocketServerFactory,
+    WebSocketClientFactory,
+    WebSocketClientProtocol,
+)
+from autobahn.twisted.testing import (
+    create_pumper,
+    MemoryReactorClockResolver,
+)
 from .common import ServerBase
 from ..server_state import (
     MemoryUsageRecorder,
@@ -14,15 +20,6 @@ from ..transit_server import (
     WebSocketTransitConnection,
 )
 
-from ..transit_server import Transit, TransitConnection, WebSocketTransitConnection
-from twisted.internet.protocol import (
-    ServerFactory,
-    ClientFactory,
-)
-from twisted.internet import protocol
-from ..server_state import create_usage_tracker
-from autobahn.twisted.websocket import WebSocketServerFactory
-
 
 def handshake(token, side=None):
     hs = b"please relay " + hexlify(token)
@@ -478,16 +475,6 @@ class Usage(ServerBase, unittest.TestCase):
         self.assertEqual(self._usage.events[2]["mood"], "happy")
 
 
-from twisted.test import iosim
-from twisted.internet.testing import MemoryReactorClock
-from twisted.internet.address import IPv4Address
-from autobahn.twisted.testing import (
-    create_pumper,
-    create_memory_agent,
-    MemoryReactorClockResolver,
-)
-
-
 class UsageWebSockets(Usage):
     """
     All the tests of 'Usage' except with a WebSocket (instead of TCP)

src/wormhole_transit_relay/transit_server.py

@@ -2,7 +2,6 @@ from __future__ import print_function, unicode_literals
 import re
 import time
 from twisted.python import log
-from twisted.internet import protocol
 from twisted.protocols.basic import LineReceiver
 from autobahn.twisted.websocket import WebSocketServerProtocol