Extensions docs server: Design changes, partial template support.

chrome/common/extensions/docs/server2/template_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
-import os
-import time
-
-from third_party.handlebar import Handlebar
-
-# Cache templates for 5 minutes.
-CACHE_TIMEOUT = 300
-
-# Cached templates stored as (branch, path) -> (template, cache time)
-# The template cache is global so it will not be erased each time a new
-# TemplateFetcher is created.
-TEMPLATE_CACHE = {}
-
-class TemplateFetcher(object):
-  def __init__(self, branch, fetcher):
-    self._fetcher = fetcher
-    self._branch = branch
-
-  def __getitem__(self, path):
-    key = (self._branch, path)
-    if key in TEMPLATE_CACHE:
-      compiled_template, compile_time = TEMPLATE_CACHE[key]
-      if (time.clock() - compile_time) > CACHE_TIMEOUT:
-        TEMPLATE_CACHE.pop(key)
-    if key not in TEMPLATE_CACHE:
-      logging.info('Template cache miss for: ' + path)
-      try:
-        template = self._fetcher.FetchResource(self._branch, path).content
-        compiled_template = Handlebar(template)
-        TEMPLATE_CACHE[key] = (compiled_template, time.clock())
-      except:
-        return ''
-
-    return compiled_template