I've been looking at the latest checkout (35) of the AppEngine SDK (which
might be the same as 1.1.8), trying to at least figure out how cron *will*
work. Here's what I've found so far.

Interestingly, the SDK's antlr definitions are incompatible with the version
of antlr invluded in the sdk, so I had to rename lib/antlr3 and install
3.1.1 from http://www.antlr.org/download/Python

There's a new yaml file at the root of your application, "cron.yaml". Here's
a simple one that validates:
-------------------
cron:
- url: /cron
  schedule: every 2 hours

-------------------

You can also optionally include a timezone and description. Here's what
groctimespecification.py says about the schedule format:

"A Groc schedule looks like '1st,2nd monday 9:00', or 'every 20 mins'. This
module takes a parsed schedule (produced by Antlr) and creates objects that
can produce times that match this schedule."

If cron.yaml is present but empty or invalid, appcfg.py update fails with
"google.appengine.api.croninfo.MalformedCronfigurationFile", if the schedule
line is invalid, it fails with "Error parsing yaml file:". Otherwise, cron
definitions are uploaded distinctly from all the other files.


ther...@localhost:~/projects/appname$ appcfg.py update .
Scanning files on local disk.
Scanned 500 files.
Initiating update.
Cloning 155 static files.
Cloned 100 files.
Cloning 57 application files.
Closing update.
Uploading index definitions.
*Uploading cron entries.*


So, all the SDK pieces appear to work, but my testing indicates this isn't
running on the production servers yet-- I set up an "every 1 minutes" cron
that logs when it runs, and it hasn't been called yet

They DO show up in the dashboard though, under admin logs:

01/19/09 07:32:28
rosskarch...@gmail.com  Added cron job 'None' schedule=every 2 hours,
url=/cron  01/19/09 07:32:28
rosskarch...@gmail.com  Removed cron job 'None ' schedule=every 1 minutes,
url=/cron

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