Docserver: achieve online vs offline (cron vs instance) behaviour at the object

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.
 
 import os
 import urlparse
 
+from empty_dir_file_system import EmptyDirFileSystem
+from local_file_system import LocalFileSystem
 from render_servlet import RenderServlet
-from fake_fetchers import ConfigureFakeFetchers
+from server_instance import ServerInstance
 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=None, servlet=RenderServlet):
+  def Render(self, path, headers=None, offline=False, 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'))
     url_path = urlparse.urlparse(path.replace(os.sep, '/')).path
-    return servlet(Request(url_path, headers)).Get()
+    if offline:
+      si = ServerInstance.CreateOffline(
+          'trunk',
+          host_file_system_type=LocalFileSystem,
+          app_samples_file_system=EmptyDirFileSystem())
+    else:
+      si = ServerInstance.CreateOnline(
+          'trunk',
+          host_file_system=LocalFileSystem(self._base_dir),
+          app_samples_file_system=EmptyDirFileSystem())
+    return servlet(Request(url_path, headers)).Get(server_instance=si)