fix flake8 errors

websockets.py

@@ -31,14 +31,12 @@ from twisted.web.resource import IResource
 from twisted.web.server import NOT_DONE_YET
 
 
-
 class _WSException(Exception):
     """
     Internal exception for control flow inside the WebSockets frame parser.
     """
 
 
-
 class CONTROLS(Values):
     """
     Control frame specifiers.
@@ -54,7 +52,6 @@ class CONTROLS(Values):
     PONG = ValueConstant(10)
 
 
-
 class STATUSES(Values):
     """
     Closing status codes.
@@ -76,12 +73,10 @@ class STATUSES(Values):
     TLS_HANDSHAKE_FAILED = ValueConstant(1056)
 
 
-
 # The GUID for WebSockets, from RFC 6455.
 _WS_GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
 
 
-
 def _makeAccept(key):
     """
     Create an B{accept} response for a given key.
@@ -95,7 +90,6 @@ def _makeAccept(key):
     return sha1("%s%s" % (key, _WS_GUID)).digest().encode("base64").strip()
 
 
-
 def _mask(buf, key):
     """
     Mask or unmask a buffer of bytes with a masking key.
@@ -116,7 +110,6 @@ def _mask(buf, key):
     return "".join(buf)
 
 
-
 def _makeFrame(buf, opcode, fin, mask=None):
     """
     Make a frame.
@@ -164,7 +157,6 @@ def _makeFrame(buf, opcode, fin, mask=None):
     return frame
 
 
-
 def _parseFrames(frameBuffer, needMask=True):
     """
     Parse frames in a highly compliant manner. It modifies C{frameBuffer}
@@ -268,7 +260,6 @@ def _parseFrames(frameBuffer, needMask=True):
         frameBuffer[:] = []
 
 
-
 class IWebSocketsFrameReceiver(Interface):
     """
     An interface for receiving WebSockets frames.
@@ -285,7 +276,6 @@ class IWebSocketsFrameReceiver(Interface):
         @type transport: L{WebSocketsTransport}.
         """
 
-
     def frameReceived(opcode, data, fin):
         """
         Callback when a frame is received.
@@ -301,7 +291,6 @@ class IWebSocketsFrameReceiver(Interface):
         """
 
 
-
 class WebSocketsTransport(object):
     """
     A frame transport for WebSockets.
@@ -316,7 +305,6 @@ class WebSocketsTransport(object):
     def __init__(self, transport):
         self._transport = transport
 
-
     def sendFrame(self, opcode, data, fin):
         """
         Build a frame packet and send it over the wire.
@@ -333,7 +321,6 @@ class WebSocketsTransport(object):
         packet = _makeFrame(base64.b64encode(data), opcode, fin)
         self._transport.write(packet)
 
-
     def loseConnection(self, code=STATUSES.NORMAL, reason=""):
         """
         Close the connection.
@@ -362,7 +349,6 @@ class WebSocketsTransport(object):
             self._transport.loseConnection()
 
 
-
 class WebSocketsProtocol(Protocol):
     """
     A protocol parsing WebSockets frames and interacting with a
@@ -379,11 +365,9 @@ class WebSocketsProtocol(Protocol):
     """
     _buffer = None
 
-
     def __init__(self, receiver):
         self._receiver = receiver
 
-
     def connectionMade(self):
         """
         Log the new connection and initialize the buffer list.
@@ -393,7 +377,6 @@ class WebSocketsProtocol(Protocol):
         self._buffer = []
         self._receiver.makeConnection(WebSocketsTransport(self.transport))
 
-
     def _parseFrames(self):
         """
         Find frames in incoming data and pass them to the underlying protocol.
@@ -417,7 +400,6 @@ class WebSocketsProtocol(Protocol):
                 self.transport.write(_makeFrame(data, CONTROLS.PONG, True))
             self._receiver.frameReceived(opcode, base64.b64decode(data), fin)
 
-
     def dataReceived(self, data):
         """
         Append the data to the buffer list and parse the whole.
@@ -434,7 +416,6 @@ class WebSocketsProtocol(Protocol):
             self.transport.loseConnection()
 
 
-
 @implementer(IWebSocketsFrameReceiver)
 class _WebSocketsProtocolWrapperReceiver():
     """
@@ -454,7 +435,6 @@ class _WebSocketsProtocolWrapperReceiver():
     def __init__(self, wrappedProtocol):
         self._wrappedProtocol = wrappedProtocol
 
-
     def makeConnection(self, transport):
         """
         Keep a reference to the given C{transport} and instantiate the list of
@@ -463,7 +443,6 @@ class _WebSocketsProtocolWrapperReceiver():
         self._transport = transport
         self._messages = []
 
-
     def frameReceived(self, opcode, data, fin):
         """
         For each frame received, accumulate the data (ignoring the opcode), and
@@ -487,7 +466,6 @@ class _WebSocketsProtocolWrapperReceiver():
             self._wrappedProtocol.dataReceived(content)
 
 
-
 class WebSocketsProtocolWrapper(WebSocketsProtocol):
     """
     A L{WebSocketsProtocol} which wraps a regular C{IProtocol} provider,
@@ -509,7 +487,6 @@ class WebSocketsProtocolWrapper(WebSocketsProtocol):
         WebSocketsProtocol.__init__(
             self, _WebSocketsProtocolWrapperReceiver(wrappedProtocol))
 
-
     def makeConnection(self, transport):
         """
         Upon connection, provides the transport interface, and forwards ourself
@@ -522,7 +499,6 @@ class WebSocketsProtocolWrapper(WebSocketsProtocol):
         WebSocketsProtocol.makeConnection(self, transport)
         self.wrappedProtocol.makeConnection(self)
 
-
     def write(self, data):
         """
         Write to the websocket protocol, transforming C{data} in a frame.
@@ -532,7 +508,6 @@ class WebSocketsProtocolWrapper(WebSocketsProtocol):
         """
         self._receiver._transport.sendFrame(self.defaultOpcode, data, True)
 
-
     def writeSequence(self, data):
         """
         Send all chunks from C{data} using C{write}.
@@ -543,7 +518,6 @@ class WebSocketsProtocolWrapper(WebSocketsProtocol):
         for chunk in data:
             self.write(chunk)
 
-
     def loseConnection(self):
         """
         Try to lose the connection gracefully when closing by sending a close
@@ -551,14 +525,12 @@ class WebSocketsProtocolWrapper(WebSocketsProtocol):
         """
         self._receiver._transport.loseConnection()
 
-
     def __getattr__(self, name):
         """
         Forward all non-local attributes and methods to C{self.transport}.
         """
         return getattr(self.transport, name)
 
-
     def connectionLost(self, reason):
         """
         Forward C{connectionLost} to C{self.wrappedProtocol}.
@@ -570,7 +542,6 @@ class WebSocketsProtocolWrapper(WebSocketsProtocol):
         self.wrappedProtocol.connectionLost(reason)
 
 
-
 @implementer(IResource)
 class WebSocketsResource(object):
     """
@@ -600,7 +571,6 @@ class WebSocketsResource(object):
     def __init__(self, lookupProtocol):
         self._lookupProtocol = lookupProtocol
 
-
     def getChildWithDefault(self, name, request):
         """
         Reject attempts to retrieve a child resource.  All path segments beyond
@@ -616,7 +586,6 @@ class WebSocketsResource(object):
         raise RuntimeError(
             "Cannot get IResource children from WebSocketsResource")
 
-
     def putChild(self, path, child):
         """
         Reject attempts to add a child resource to this resource.  The
@@ -632,7 +601,6 @@ class WebSocketsResource(object):
         raise RuntimeError(
             "Cannot put IResource children under WebSocketsResource")
 
-
     def render(self, request):
         """
         Render a request.
@@ -727,7 +695,6 @@ class WebSocketsResource(object):
         return NOT_DONE_YET
 
 
-
 def lookupProtocolForFactory(factory):
     """
     Return a suitable C{lookupProtocol} argument for L{WebSocketsResource}