12 hours from now everything will revert to read-only and memcache
will fail. So, what to do? Well, x from Google provided a very useful
option on how to detect that the server has gone into read-only mode:
capabilities.CapabilitySet('datastore_v3', ['write']).is_enabled()
This will return a boolean value, and should look something like the
following in python:
from google.appengine.api import capabilities # check capabilities
with this import
if capabilities.CapabilitySet('datastore_v3', ['write']).is_enabled()
== False:
# render page normally here, including relying on writes and
memcache
else:
# fail gracefully here - possibly letting the user know that there's
maintenance going on and that he/she should wait half an hour and
check again
HOWEVER, there is a huge problem. I just did something similar for my
app, with the result that it immediately gave me massive quota-fails.
As soon as 100 of the capabilities.CapabilitySet('datastore_v3',
['write']).is_enabled() had been used, it began returning over-quota
errors in the logs.
I can't find the quota-reference that I have presumably been
surpassing anywhere in the documentation, but it suddenly showed up as
"Capability Configs Requested" and "Capability Configs Recieved". This
should really have been reflected in the email sent out, or at least
in the quota documentation.
Under normal circumstances I would cache the response by is_enabled()
in memcache - but since this will not work either during maintenance -
there's really nothing to use the above for unless your site will have
less than 100 hits.
I write this, so that others might not do the same.
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