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

Index: chrome/common/extensions/docs/server2/github_file_system.py
diff --git a/chrome/common/extensions/docs/server2/github_file_system.py b/chrome/common/extensions/docs/server2/github_file_system.py
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+# 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 json
+
+import file_system
+from future import Future
+
+class GithubFileSystem(file_system.FileSystem):
+  """Class to fetch resources from github.
+  """
+  def __init__(self, fetcher):
+    self._fetcher = fetcher
+
+  def Read(self, paths, binary=False):
+    return Future(delegate=_AsyncFetchFuture(paths, self._fetcher, binary))
+
+  def Stat(self, path):
+    if not path.strip('/'):
+      return self.StatInfo(0)
+    parts = path.strip('/').rsplit('/', 1)
+    if len(parts) == 1:
+      name = parts[0]
+      directory = '/'
+    else:
+      name = parts[-1]
+      directory = parts[-2]
+    json_ = json.loads(self._fetcher.Fetch(directory).content)
+    for item in json_:
+      if item['name'] == name:
+        return self.StatInfo(item['sha'])
+
+  def CheckStat(self, version1, version2):
+    return version1 != version2
+
+class _AsyncFetchFuture(object):
+  def __init__(self, paths, fetcher, binary):
+    # A list of tuples of the form (path, Future).
+    self._fetches = []
+    self._value = {}
+    self._error = None
+    self._fetches = [(path, fetcher.FetchAsync(path.strip('/')))
+                      for path in paths]
+    self._binary = binary
+
+  def _ListDir(self, directory):
+    dir_json = json.loads(directory)
+    files = []
+    for entry in dir_json:
+      if entry['type'] == 'dir':
+        files.append(entry['name'] + '/')
+      else:
+        files.append(entry['name'])
+    return files
+
+  def _GetFile(self, data, binary, path):
+    file_json = json.loads(data)
+    file_contents = file_json['content'].decode(file_json['encoding'])
+    if binary:
+      return file_contents
+    return file_system._ProcessFileData(file_contents, path)
+
+  def Get(self):
+    for path, future in self._fetches:
+      result = future.Get()
+      if result.status_code == 404:
+        self._value[path] = None
+      elif path.endswith('/'):
+        self._value[path] = self._ListDir(result.content)
+      else:
+        self._value[path] = self._GetFile(result.content, self._binary, path)
+    if self._error is not None:
+      raise self._error
+    return self._value
+