39 lines
1.2 KiB
Racket
39 lines
1.2 KiB
Racket
#lang syndicate
|
|
;; Monitor configuration files.
|
|
|
|
(provide (struct-out config)
|
|
spawn-configuration
|
|
define/query-config
|
|
config-ref)
|
|
|
|
(define-logger syndicate/drivers/config)
|
|
|
|
(require racket/file)
|
|
(require/activate syndicate/drivers/filesystem)
|
|
|
|
;; (config Any Any)
|
|
(struct config (scope item) #:prefab)
|
|
|
|
(define (spawn-configuration scope path #:hook [hook void])
|
|
(spawn #:name (list 'configuration-monitor scope path)
|
|
(hook)
|
|
(during (file-content path file->list $items)
|
|
(cond
|
|
[(not items)
|
|
(log-syndicate/drivers/config-warning "config ~s is missing" path)]
|
|
[else
|
|
(log-syndicate/drivers/config-info "loading config ~s" path)
|
|
(for [(item items)]
|
|
(log-syndicate/drivers/config-info "config ~s: ~s" path item)
|
|
(assert (config scope item)))]))))
|
|
|
|
(define-syntax define/query-config
|
|
(syntax-rules ()
|
|
[(_ scope id default)
|
|
(define/query-config id scope id default)]
|
|
[(_ id scope key default)
|
|
(define/query-value id default (config scope (list 'key $val)) val)]))
|
|
|
|
(define (config-ref #:scope [scope ?] key default)
|
|
(immediate-query (query-value default (config scope (list key $val)) val)))
|