Improve exception hierarchy

ProxyException -> MitmproxyException
NetlibException inherits from MitmproxyException

mitmproxy/exceptions.py

@@ -2,15 +2,15 @@
 We try to be very hygienic regarding the exceptions we throw:
 
 - Every exception that might be externally visible to users shall be a subclass
-  of ProxyException.p
+  of MitmproxyException.p
 - Every exception in the base net module shall be a subclass
   of NetlibException, and will not be propagated directly to users.
 
 See also: http://lucumr.pocoo.org/2014/10/16/on-error-handling/
 """
 
 
-class ProxyException(Exception):
+class MitmproxyException(Exception):
 
     """
     Base class for all exceptions thrown by mitmproxy.
@@ -20,15 +20,15 @@ def __init__(self, message=None):
         super().__init__(message)
 
 
-class Kill(ProxyException):
+class Kill(MitmproxyException):
 
     """
     Signal that both client and server connection(s) should be killed immediately.
     """
     pass
 
 
-class ProtocolException(ProxyException):
+class ProtocolException(MitmproxyException):
     """
     ProtocolExceptions are caused by invalid user input, unavailable network resources,
     or other events that are outside of our influence.
@@ -69,48 +69,48 @@ class Http2ZombieException(ProtocolException):
     pass
 
 
-class ServerException(ProxyException):
+class ServerException(MitmproxyException):
     pass
 
 
-class ContentViewException(ProxyException):
+class ContentViewException(MitmproxyException):
     pass
 
 
-class ReplayException(ProxyException):
+class ReplayException(MitmproxyException):
     pass
 
 
-class FlowReadException(ProxyException):
+class FlowReadException(MitmproxyException):
     pass
 
 
-class ControlException(ProxyException):
+class ControlException(MitmproxyException):
     pass
 
 
-class SetServerNotAllowedException(ProxyException):
+class SetServerNotAllowedException(MitmproxyException):
     pass
 
 
-class OptionsError(Exception):
+class OptionsError(MitmproxyException):
     pass
 
 
-class AddonError(Exception):
+class AddonError(MitmproxyException):
     pass
 
 
-class AddonHalt(Exception):
+class AddonHalt(MitmproxyException):
     pass
 
 
 """
-    Every net Exception raised shall be a subclass of NetlibException.
+    Net-layer exceptions
 """
 
 
-class NetlibException(Exception):
+class NetlibException(MitmproxyException):
     """
     Base class for all exceptions thrown by netlib.
     """

mitmproxy/proxy/protocol/rawtcp.py

@@ -5,6 +5,7 @@
 import netlib.tcp
 from mitmproxy import tcp
 from mitmproxy import flow
+from mitmproxy import exceptions
 from mitmproxy.proxy.protocol import base