[Bug debuginfod/27673] [debuginfod] Handle source requests for same buildid more efficiently

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27673

--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Frank Ch. Eigler from comment #4)
> > debuginfod:
> > - when receiving a source request and ENOENT, send as reply the list of
> >   available files for the buildid
> > 
> > client:
> > - when receiving a list of available files for a buildid, store it and
> >   use it to reply to source requests related to the buildid. That is,
> >   if the file is not in the list, reply with -2.  Otherwise, send a
> >   request to debuginfod, and expect it to succeed.
> 
> Interesting.  A more first-class solution could be a new webapi to
> enumerate source files: a "/buildid/HEXCODE/sourcelist" query that
> returns a structured piece of data.  This can be computed by debuginfod
> fairly rapidly.  The client could cache that and use it to drive a
> negative-cache hit on a subsequent source query.

Agreed, it would be good to have this kind of functionality available more
generically.

Then the client (preferably the elfutils client itself using some setting,
otherwise the part using the elfutils client) could upon the first source
request send a sourcelist request in parallel, to have the latencies of the two
requests overlap.

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