Docserver: Add support for viewing docs with a codereview patch applied

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

Index: chrome/common/extensions/docs/server2/object_store_creator.py
===================================================================
--- chrome/common/extensions/docs/server2/object_store_creator.py	(revision 196927)
+++ chrome/common/extensions/docs/server2/object_store_creator.py	(working copy)
@@ -13,18 +13,30 @@
       namespace for the object stores that are created.
     - |start_empty| Whether the caching object store that gets created should
       start empty, or start with the content of its delegate object stores.
+    - |persistent| Whether the caching object store is persistent.
+    - |more| A dictionary containing other information to include in the
+      namespace.
     '''
-    def __init__(self, app_version, branch, start_empty=False):
+    def __init__(self,
+                 app_version,
+                 branch,
+                 start_empty=False,
+                 persistent=True,
+                 more=None):
       self._app_version = app_version
       self._branch = branch
       self._start_empty = start_empty
+      self._persistent = persistent
+      self._more = more
 
     def Create(self, cls, store_type=None):
       return ObjectStoreCreator(cls,
                                 self._app_version,
                                 self._branch,
                                 store_type=store_type,
-                                start_empty=self._start_empty)
+                                start_empty=self._start_empty,
+                                persistent=self._persistent,
+                                more=self._more)
 
   class SharedFactory(object):
     '''A |Factory| for creating object stores shared across branches.
@@ -49,7 +61,9 @@
                app_version,
                branch,
                store_type=None,
-               start_empty=False):
+               start_empty=False,
+               persistent=True,
+               more=None):
     '''Creates stores with a top-level namespace given by the name of |cls|
     combined with |branch|. Set an explicit |store_type| if necessary for tests.
 
@@ -59,9 +73,18 @@
     '''
     assert isinstance(cls, type)
     assert not cls.__name__[0].islower()  # guard against non-class types
-    self._name = '%s/%s@%s' % (app_version, cls.__name__, branch)
+    _components = {
+      'version': app_version,
+      'branch': branch,
+      'cls': cls.__name__,
+    }
+    if more:
+      _components.update(more)
+    self._name = '/'.join('%s=%s' % (key, _components[key])
+        for key in sorted(_components.keys()))
     self._store_type = store_type
     self._start_empty = start_empty
+    self._persistent = persistent
 
   def Create(self, category=None):
     '''Creates a new object store with the top namespace given in the
@@ -74,6 +97,7 @@
       namespace = '%s/%s' % (namespace, category)
     if self._store_type is not None:
       return self._store_type(namespace)
-    return CacheChainObjectStore(
-        (MemcacheObjectStore(namespace), PersistentObjectStore(namespace)),
-        start_empty=self._start_empty)
+    object_stores = (MemcacheObjectStore(namespace),)
+    if self._persistent:
+      object_stores += (PersistentObjectStore(namespace),)
+    return CacheChainObjectStore(object_stores, start_empty=self._start_empty)