Thanks Nate! That's very helpful.
From: Nate Coraor [mailto:n...@bx.psu.edu]
Sent: Friday, June 08, 2012 3:31 PM
To: Dorset, Daniel C
Subject: Re: [galaxy-dev] How does Galaxy access datasets?
On Jun 5, 2012, at 6:08 PM, Dorset, Daniel C wrote:
> I'm trying to troubleshoot why I can't retrieve output from my Galaxy cluster
> instance. I notice that when I click on any output, the URL is something like:
> http://[root galaxy address]/datasets/[some 16-character
> hash]/display/[file name]
> I'm not able to find the "datasets" directory on the local machine, and I
> couldn't figure anything out by searching the paster.log file and the apache
> access and error logs. Everytime I try to access output, it downloads a
> zero-byte file. The files that I want to download through Galaxy are in the
> correct subdirectory of /database/files/... If someone could explain to be
> what's going on "behind the scenes," it would help me quite a bit. I'm
> guessing that the absolute path is stored in a database, but beyond that I
> don't know any specifics. If that's the case, knowing the relevant database
> tables would be a huge hint.
The hash is decoded and converted to an ID using code in
lib/galaxy/web/security/__init__.py and the value of id_secret in
universe_wsgi.ini. The decoded id is then passed to code in
lib/galaxy/objectstore/__init__.py to assemble the path underneath
You may find galaxy-dist/scripts/helper.py in converting history dataset IDs to
filesystem paths (they are also available directly in the web interface if you
are an administrator or set expose_dataset_path = True in universe_wsgi.ini).
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