Extensions Docs Server: Internal file system

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

+# Copyright (c) 2012 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 logging
+from google.appengine.api import urlfetch
+
+from future import Future
+
+class _AsyncFetchDelegate(object):
+  def __init__(self, rpc):
+    self._rpc = rpc
+
+  def Get(self):
+    self._rpc.wait()
+    return self._rpc.get_result()
+
+class AppEngineUrlFetcher(object):
+  """A wrapper around the App Engine urlfetch module that allows for easy
+  async fetches.
+  """
+  def __init__(self, base_path):
+    self._base_path = base_path
+
+  def Fetch(self, url):
+    """Fetches a file synchronously.
+    """
+    return urlfetch.fetch(self._base_path + '/' + url)
+
+  def FetchAsync(self, url):
+    """Fetches a file asynchronously, and returns a Future with the result.
+    """
+    rpc = urlfetch.create_rpc()
+    urlfetch.make_fetch_call(rpc, self._base_path + '/' + url)
+    return Future(delegate=_AsyncFetchDelegate(rpc))