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Unified Diff: chrome/common/extensions/docs/server2/render_servlet.py

Issue 14856006: Docserver: achieve online vs offline (cron vs instance) behaviour at the object (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: . Created 7 years, 8 months ago
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Index: chrome/common/extensions/docs/server2/render_servlet.py
diff --git a/chrome/common/extensions/docs/server2/render_servlet.py b/chrome/common/extensions/docs/server2/render_servlet.py
index be310d838290441de8337cbc64c3d3d2480eabad..ac473414c79f88814c3455d1f3a6abe2ca1e48b1 100644
--- a/chrome/common/extensions/docs/server2/render_servlet.py
+++ b/chrome/common/extensions/docs/server2/render_servlet.py
@@ -14,6 +14,7 @@ from file_system import FileNotFoundError
from server_instance import ServerInstance
from servlet import Servlet, Response
import svn_constants
+from third_party.json_schema_compiler.memoize import memoize
_DEFAULT_CHANNEL = 'stable'
@@ -23,24 +24,30 @@ def _IsBinaryMimetype(mimetype):
return any(mimetype.startswith(prefix)
for prefix in ['audio', 'image', 'video'])
-def AlwaysOnline(fn):
- '''A function decorator which forces the rendering to be always online rather
- than the default offline behaviour. Useful for testing.
- '''
- def impl(*args, **optargs):
- global _ALWAYS_ONLINE
- was_always_online = _ALWAYS_ONLINE
- try:
- _ALWAYS_ONLINE = True
- return fn(*args, **optargs)
- finally:
- _ALWAYS_ONLINE = was_always_online
- return impl
+@memoize
+def _GetOrCreateServerInstance(channel):
+ return ServerInstance.CreateOffline(channel)
class RenderServlet(Servlet):
'''Servlet which renders templates.
'''
def Get(self, server_instance=None):
+ # A note about |server_instance|:
+ #
+ # AppEngine instances should never need to call out to SVN. That should
+ # only ever be done by the cronjobs, which then write the result into
+ # DataStore, which is as far as instances look. To enable this, crons can
+ # pass a custom (presumably online) ServerInstance into Get().
+ #
+ # Why? SVN is slow and a bit flaky. Cronjobs failing is annoying but
+ # temporary. Instances failing affects users, and is really bad.
+ #
+ # Anyway - to enforce this, we actually don't give instances access to SVN.
+ # If anything is missing from datastore, it'll be a 404. If the cronjobs
+ # don't manage to catch everything - uhoh. On the other hand, we'll figure
+ # it out pretty soon, and it also means that legitimate 404s are caught
+ # before a round trip to SVN.
+
path_with_channel, headers = (self._request.path.lstrip('/'),
self._request.headers)
@@ -59,25 +66,8 @@ class RenderServlet(Servlet):
if channel is None:
channel = _DEFAULT_CHANNEL
- # AppEngine instances should never need to call out to SVN. That should
- # only ever be done by the cronjobs, which then write the result into
- # DataStore, which is as far as instances look. To enable this, crons can
- # pass a custom (presumably online) ServerInstance into Get().
- #
- # Why? SVN is slow and a bit flaky. Cronjobs failing is annoying but
- # temporary. Instances failing affects users, and is really bad.
- #
- # Anyway - to enforce this, we actually don't give instances access to SVN.
- # If anything is missing from datastore, it'll be a 404. If the cronjobs
- # don't manage to catch everything - uhoh. On the other hand, we'll figure
- # it out pretty soon, and it also means that legitimate 404s are caught
- # before a round trip to SVN.
if server_instance is None:
- # The ALWAYS_ONLINE thing is for tests and preview.py that shouldn't need
- # to run the cron before rendering things.
- constructor = (ServerInstance.CreateOnline if _ALWAYS_ONLINE else
- ServerInstance.GetOrCreateOffline)
- server_instance = constructor(channel)
+ server_instance = _GetOrCreateServerInstance(channel)
canonical_path = server_instance.path_canonicalizer.Canonicalize(path)
if path != canonical_path:

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