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services: configuration: Support (field1 maybe-number "") format.
As opposed to explicitly using 'disabled as value, or using the (field1 (maybe-number) "") format. It's mostly the work of Maxime Devos shared under #54674, with some modifications by Attila Lendvai. * gnu/services/configuration.scm (normalize-field-type+def): New function. (define-configuration-helper) (define-configuration): Support new field format. * tests/services/configuration.scm (config-with-maybe-number->string): New function. ("maybe value serialization of the instance"): New test. ("maybe value serialization of the instance, unspecified"): New test. Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Attila Lendvai
Ludovic Courtès
parent
3d0749b4e3
commit
e11517052b
2 changed files with 114 additions and 83 deletions
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@ -5,6 +5,7 @@
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;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz>
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;;; Copyright © 2021 Maxim Cournoyer <maxim.cournoyer@gmail.com>
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;;; Copyright © 2021 Andrew Tropin <andrew@trop.in>
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;;; Copyright © 2022 Maxime Devos <maximedevos@telenet.be>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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@ -162,78 +163,90 @@ (define-maybe-helper #t #f #'(_ stem))))))
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(define-syntax-rule (define-maybe/no-serialization stem)
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(define-maybe stem (no-serialization)))
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(define (normalize-field-type+def s)
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(syntax-case s ()
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((field-type def)
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(identifier? #'field-type)
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(values #'(field-type def)))
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((field-type)
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(identifier? #'field-type)
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(values #'(field-type 'disabled)))
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(field-type
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(identifier? #'field-type)
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(values #'(field-type 'disabled)))))
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(define (define-configuration-helper serialize? serializer-prefix syn)
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(syntax-case syn ()
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((_ stem (field (field-type def ...) doc custom-serializer ...) ...)
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(with-syntax (((field-getter ...)
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(map (lambda (field)
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(id #'stem #'stem #'- field))
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#'(field ...)))
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((field-predicate ...)
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(map (lambda (type)
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(id #'stem type #'?))
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#'(field-type ...)))
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((field-default ...)
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(map (match-lambda
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((field-type default-value)
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default-value)
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((field-type)
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;; Quote `undefined' to prevent a possibly
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;; unbound warning.
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(syntax 'undefined)))
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#'((field-type def ...) ...)))
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((field-serializer ...)
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(map (lambda (type custom-serializer)
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(and serialize?
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(match custom-serializer
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((serializer)
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serializer)
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(()
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(if serializer-prefix
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(id #'stem
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serializer-prefix
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#'serialize- type)
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(id #'stem #'serialize- type))))))
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#'(field-type ...)
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#'((custom-serializer ...) ...))))
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#`(begin
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(define-record-type* #,(id #'stem #'< #'stem #'>)
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#,(id #'stem #'% #'stem)
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#,(id #'stem #'make- #'stem)
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#,(id #'stem #'stem #'?)
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(%location #,(id #'stem #'stem #'-location)
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(default (and=> (current-source-location)
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source-properties->location))
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(innate))
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#,@(map (lambda (name getter def)
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(if (eq? (syntax->datum def) (quote 'undefined))
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#`(#,name #,getter)
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#`(#,name #,getter (default #,def))))
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#'(field ...)
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#'(field-getter ...)
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#'(field-default ...)))
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(define #,(id #'stem #'stem #'-fields)
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(list (configuration-field
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(name 'field)
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(type 'field-type)
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(getter field-getter)
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(predicate field-predicate)
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(serializer field-serializer)
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(default-value-thunk
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(lambda ()
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(display '#,(id #'stem #'% #'stem))
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(if (eq? (syntax->datum field-default)
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'undefined)
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(configuration-no-default-value
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'#,(id #'stem #'% #'stem) 'field)
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field-default)))
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(documentation doc))
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...))
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(define-syntax-rule (stem arg (... ...))
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(let ((conf (#,(id #'stem #'% #'stem) arg (... ...))))
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(validate-configuration conf
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#,(id #'stem #'stem #'-fields))
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conf)))))))
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((_ stem (field field-type+def doc custom-serializer ...) ...)
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(with-syntax
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((((field-type def) ...)
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(map normalize-field-type+def #'(field-type+def ...))))
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(with-syntax
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(((field-getter ...)
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(map (lambda (field)
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(id #'stem #'stem #'- field))
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#'(field ...)))
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((field-predicate ...)
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(map (lambda (type)
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(id #'stem type #'?))
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#'(field-type ...)))
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((field-default ...)
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(map (match-lambda
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((field-type default-value)
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default-value))
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#'((field-type def) ...)))
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((field-serializer ...)
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(map (lambda (type custom-serializer)
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(and serialize?
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(match custom-serializer
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((serializer)
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serializer)
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(()
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(if serializer-prefix
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(id #'stem
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serializer-prefix
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#'serialize- type)
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(id #'stem #'serialize- type))))))
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#'(field-type ...)
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#'((custom-serializer ...) ...))))
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#`(begin
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(define-record-type* #,(id #'stem #'< #'stem #'>)
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#,(id #'stem #'% #'stem)
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#,(id #'stem #'make- #'stem)
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#,(id #'stem #'stem #'?)
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(%location #,(id #'stem #'stem #'-location)
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(default (and=> (current-source-location)
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source-properties->location))
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(innate))
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#,@(map (lambda (name getter def)
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(if (eq? (syntax->datum def) (quote 'undefined))
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#`(#,name #,getter)
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#`(#,name #,getter (default #,def))))
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#'(field ...)
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#'(field-getter ...)
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#'(field-default ...)))
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(define #,(id #'stem #'stem #'-fields)
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(list (configuration-field
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(name 'field)
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(type 'field-type)
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(getter field-getter)
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(predicate field-predicate)
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(serializer field-serializer)
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(default-value-thunk
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(lambda ()
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(display '#,(id #'stem #'% #'stem))
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(if (eq? (syntax->datum field-default)
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'undefined)
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(configuration-no-default-value
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'#,(id #'stem #'% #'stem) 'field)
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field-default)))
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(documentation doc))
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...))
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(define-syntax-rule (stem arg (... ...))
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(let ((conf (#,(id #'stem #'% #'stem) arg (... ...))))
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(validate-configuration conf
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#,(id #'stem #'stem #'-fields))
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conf))))))))
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(define no-serialization ;syntactic keyword for 'define-configuration'
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'(no serialization))
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@ -241,26 +254,26 @@ (define no-serialization ;syntactic keyword for 'define-configuration'
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(define-syntax define-configuration
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(lambda (s)
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(syntax-case s (no-serialization prefix)
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((_ stem (field (field-type def ...) doc custom-serializer ...) ...
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((_ stem (field field-type+def doc custom-serializer ...) ...
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(no-serialization))
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(define-configuration-helper
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#f #f #'(_ stem (field (field-type def ...) doc custom-serializer ...)
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#f #f #'(_ stem (field field-type+def doc custom-serializer ...)
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...)))
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((_ stem (field (field-type def ...) doc custom-serializer ...) ...
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((_ stem (field field-type+def doc custom-serializer ...) ...
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(prefix serializer-prefix))
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(define-configuration-helper
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#t #'serializer-prefix #'(_ stem (field (field-type def ...)
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#t #'serializer-prefix #'(_ stem (field field-type+def
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doc custom-serializer ...)
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...)))
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((_ stem (field (field-type def ...) doc custom-serializer ...) ...)
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((_ stem (field field-type+def doc custom-serializer ...) ...)
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(define-configuration-helper
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#t #f #'(_ stem (field (field-type def ...) doc custom-serializer ...)
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#t #f #'(_ stem (field field-type+def doc custom-serializer ...)
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...))))))
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(define-syntax-rule (define-configuration/no-serialization
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stem (field (field-type def ...)
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stem (field field-type+def
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doc custom-serializer ...) ...)
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(define-configuration stem (field (field-type def ...)
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(define-configuration stem (field field-type+def
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doc custom-serializer ...) ...
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(no-serialization)))
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@ -27,6 +27,9 @@ (define-module (tests services configuration)
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(test-begin "services-configuration")
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(define (serialize-number field value)
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(format #f "~a=~a" field value))
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;;;
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;;; define-configuration macro.
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@ -47,7 +50,6 @@ (define-configuration port-configuration-cs
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80
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(port-configuration-cs-port (port-configuration-cs)))
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(define serialize-number "")
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(define-configuration port-configuration-ndv
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(port (number) "The port number."))
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@ -101,15 +103,31 @@ (define-configuration configuration-with-prefix
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(define-maybe number)
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(define-configuration config-with-maybe-number
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(port (maybe-number 80) "The port number."))
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(define (serialize-number field value)
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(format #f "~a=~a" field value))
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(port (maybe-number 80) "")
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(count maybe-number ""))
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(test-equal "maybe value serialization"
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"port=80"
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(serialize-maybe-number "port" 80))
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(define (config-with-maybe-number->string x)
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(eval (gexp->approximate-sexp
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(serialize-configuration x config-with-maybe-number-fields))
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(current-module)))
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(test-equal "maybe value serialization of the instance"
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"port=42count=43"
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(config-with-maybe-number->string
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(config-with-maybe-number
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(port 42)
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(count 43))))
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(test-equal "maybe value serialization of the instance, unspecified"
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"port=42"
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(config-with-maybe-number->string
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(config-with-maybe-number
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(port 42))))
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(define-maybe/no-serialization string)
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(define-configuration config-with-maybe-string/no-serialization
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