Docserver: refactor the Handler/ServerInstance relationship into a servlet

chrome/common/extensions/docs/server2/local_renderer.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from handler import Handler
-from fake_fetchers import ConfigureFakeFetchers
 import os
-from StringIO import StringIO
 import urlparse
 
-class _Request(object):
-  def __init__(self, path, headers):
-    self.path = path
-    self.url = 'http://localhost/%s' % path
-    self.headers = headers
-
-class _Response(object):
-  def __init__(self):
-    self.status = 200
-    self.out = StringIO()
-    self.headers = {}
-
-  def set_status(self, status):
-    self.status = status
+from render_servlet import RenderServlet
+from fake_fetchers import ConfigureFakeFetchers
+from servlet import Request
 
 class LocalRenderer(object):
   '''Renders pages fetched from the local file system.
   '''
   def __init__(self, base_dir):
     self._base_dir = base_dir.replace(os.sep, '/').rstrip('/')
 
-  def Render(self, path, headers={}, always_online=False):
+  def Render(self, path, headers=None, servlet=RenderServlet):
     '''Renders |path|, returning a tuple of (status, contents, headers).
     '''
+    headers = headers or {}
     # TODO(kalman): do this via a LocalFileSystem not this fake AppEngine stuff.
     ConfigureFakeFetchers(os.path.join(self._base_dir, 'docs'))
-    handler_was_always_online = Handler.ALWAYS_ONLINE
-    Handler.ALWAYS_ONLINE = always_online
-    try:
-      response = _Response()
-      url_path = urlparse.urlparse(path.replace(os.sep, '/')).path
-      Handler(_Request(url_path, headers), response).get()
-      content = response.out.getvalue()
-      if isinstance(content, unicode):
-        content = content.encode('utf-8', 'replace')
-      return (content, response.status, response.headers)
-    finally:
-      Handler.ALWAYS_ONLINE = handler_was_always_online
+    url_path = urlparse.urlparse(path.replace(os.sep, '/')).path
+    return servlet(Request(url_path, headers)).Get()