Extension docs server: many changes to bring down the latency of the server,

chrome/common/extensions/docs/server2/samples_data_source.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 json
 import logging
 import re
+import time
 
 import third_party.json_schema_compiler.json_comment_eater as json_comment_eater
 import third_party.json_schema_compiler.model as model
 import url_constants
 
 DEFAULT_ICON_PATH = '/images/sample-default-icon.png'
 
 class SamplesDataSource(object):
   """Constructs a list of samples and their respective files and api calls.
   """
@@ skipping 14 matching lines @@
       self._static_path = ((('/' + branch) if branch != 'local' else '') +
                            '/static')
       self._extensions_cache = cache_builder.build(self._MakeSamplesList)
       self._apps_cache = github_cache_builder.build(
           lambda x: self._MakeSamplesList(x, is_apps=True))
       self._samples_path = samples_path
 
     def Create(self, request):
       """Returns a new SamplesDataSource bound to |request|.
       """
-      return SamplesDataSource(self._extensions_cache,
-                               self._apps_cache,
+      return SamplesDataSource(self._extensions_cache.ScopeToRequest(),
+                               self._apps_cache.ScopeToRequest(),
                                self._samples_path,
                                request)
 
     def _GetApiItems(self, js_file):
       return set(re.findall('(chrome\.[a-zA-Z0-9\.]+)', js_file))
 
     def _MakeApiLink(self, prefix, item):
       api, name = item.replace('chrome.', '').split('.', 1)
       return api + '.html#' + prefix + '-' + name
 
@@ skipping 142 matching lines @@
           sample_data = dict_
         return_list.append(sample_data)
       else:
         return_list.append(dict_)
     return return_list
 
   def __getitem__(self, key):
     return self.get(key)
 
   def get(self, key):
+    start_time = time.time()
+    try:
+      return self._do_get(key)
+    finally:
+      logging.info("SamplesDataSource: %sms", (time.time() - start_time) * 1000)
+
+  def _do_get(self, key):
     return {
       'apps': lambda: self._CreateSamplesDict('apps'),
       'extensions': lambda: self._CreateSamplesDict('extensions')
     }.get(key, lambda: {})()