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* guix/substitutes.scm (%narinfo-negative-ttl): Change to 15mn.
(%narinfo-transient-error-ttl): Halve.
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As an additional value, in addition to the narinfos. This value is useful in
the weather script for reporting how many requests to the substitute server
were made.
* guix/substitutes.scm (lookup-narinfos): Additionally return the number of
requests made.
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Rather than always outputting to (current-error-port) in
lookup-narinfos (which is called from within lookup-narinfos/diverse), take a
procedure which should return a progress reporter, and defer any output to
that.
As this is now general purpose code, make the default behaviour to output
nothing. Maintain the current behaviour of the substitute script by moving the
progress reporter implementation there, and passing it in when calling
lookup-narinfos/diverse.
These changes should be generally useful, but I'm particularly looking at
getting guix weather to do progress reporting differently, with this new
flexibility.
* guix/substitutes.scm (fetch-narinfos): Take a procedure to make a
progress-reporter, and use that rather than the hardcoded behaviour.
(lookup-narinfos): Add #:make-progress-reporter keyword argument, and pass
this through to fetch-narinfos.
(lookup-narinfos/diverse): Add a #:make-progress-reporter keyword argument,
and pass this through to lookup-narinfos.
* guix/scripts/substitute.scm (process-query): Pass a progress-reporter to
lookup-narinfos/diverse.
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This means there's a module for working with substitutes, rather than all the
code sitting in the script. The need for this can be seen with the weather and
challenge scripts, that now don't have to use code from the substitute script,
but can instead use the substitute module.
The separation here between the actual functionality of the substitute script
and the underlying functionality used both there and elsewhere should make
maintenance easier moving forward.
This commit just moves code, none of the code should have been changed
significantly.
* guix/scripts/substitute.scm (%narinfo-cache-directory, %narinfo-ttl,
%narinfo-negative-ttl, %narinfo-transient-error-ttl, %unreachable-hosts): Move
variables to guix/substitutes.scm.
(narinfo-cache-file, cached-narinfo, cache-narinfo!, narinfo-request,
read-to-eof, call-with-connection-error-handling, fetch-narinfos,
lookup-narinfos, lookup-narinfos/diverse): Move procedures to
guix/substitutes.scm.
* guix/substitutes.scm: New file.
* Makefile.am: Add it.
* guix/narinfo.scm: Remove redundant module.
* guix/scripts/challenge.scm: Change (guix scripts substitute) to (guix
substitutes).
* guix/scripts/weather.scm: Change (guix scripts substitute) to (guix
substitutes).
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