Refactor au_test_harness into modules and refactor to use worker design.

bin/au_test_harness/cros_test_proxy.py

Index: bin/au_test_harness/cros_test_proxy.py
diff --git a/lib/cros_test_proxy.py b/bin/au_test_harness/cros_test_proxy.py
old mode 100755
new mode 100644
similarity index 94%
rename from lib/cros_test_proxy.py
rename to bin/au_test_harness/cros_test_proxy.py
index 464dcb539b87d835af9e15db578999bced35e9a4..0b3728638bf0c4a835562c341482100035400d73
--- a/lib/cros_test_proxy.py
+++ b/bin/au_test_harness/cros_test_proxy.py
@@ -2,6 +2,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+"""Module containing various classes pertaining to inserting a proxy in a test.
+"""
+
 import os
 import select
 import socket
@@ -10,45 +13,45 @@ import threading
 
 class Filter(object):
   """Base class for data filters.
-  
+
      Pass subclass of this to CrosTestProxy which will perform whatever
      connection manipulation you prefer.
   """
-  
+
   def setup(self):
     """This setup method is called once per connection."""
     pass
-  
+
   def InBound(self, data):
     """This method is called once per packet of incoming data.
-    
+
        The value returned is what is sent through the proxy. If
        None is returned, the connection will be closed.
     """
-    return data 
+    return data
 
   def OutBound(self, data):
     """This method is called once per packet of outgoing data.
-    
+
        The value returned is what is sent through the proxy. If
        None is returned, the connection will be closed.
     """
-    return data 
+    return data
 
 
 class CrosTestProxy(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
   """A transparent proxy for simulating network errors"""
-  
+
   class _Handler(SocketServer.BaseRequestHandler):
     """Proxy connection handler that passes data though a filter"""
 
     def setup(self):
       """Setup is called once for each connection proxied."""
       self.server.filter.setup()
-  
+
     def handle(self):
       """Handles each incoming connection.
-      
+
          Opens a new connection to the port we are proxing to, then
          passes each packet along in both directions after passing
          them through the filter object passed in.
@@ -60,7 +63,7 @@ class CrosTestProxy(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
 
       while True:
         rlist, wlist, xlist = select.select([s_in, s_out], [], [])
-             
+
         if s_in in rlist:
           data = s_in.recv(1024)
           data = self.server.filter.InBound(data)
@@ -83,13 +86,13 @@ class CrosTestProxy(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
 
       s_in.close()
       s_out.close()
-  
+
   def __init__(self,
                filter,
                port_in=8081,
-               address_out='127.0.0.1', port_out=8080):    
+               address_out='127.0.0.1', port_out=8080):
     """Configures the proxy object.
-      
+
     Args:
       filter: An instance of a subclass of Filter.
       port_in: Port on which to listen for incoming connections.
@@ -100,7 +103,7 @@ class CrosTestProxy(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
     self.address_out = address_out
     self.port_out = port_out
     self.filter = filter
-    
+
     try:
         SocketServer.TCPServer.__init__(self,
                                         ('', port_in),
@@ -114,5 +117,5 @@ class CrosTestProxy(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
     server_thread = threading.Thread(target=self.serve_forever)
     server_thread.setDaemon(True)
     server_thread.start()
-    
+
     return server_thread