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(define-module (gn services rshiny)
#:use-module (gnu)
#:use-module (gnu packages cran)
#:use-module (gnu services shepherd)
#:use-module (guix records)
#:use-module (ice-9 match)
#:export (<rshiny-configuration>
rshiny-configuration
rshiny-configuration?
rshiny-configuration-package
rshiny-configuration-binary
rshiny-shepherd-service
rshiny-service-type))
(define-record-type* <rshiny-configuration>
rshiny-configuration
make-rshiny-configuration
rshiny-configuration?
(package rshiny-configuration-package ; package
(default r-shiny))
(binary rshiny-configuration-binary ; string
(default "rshiny")))
(define rshiny-shepherd-service
(match-lambda
(($ <rshiny-configuration> package binary)
(list
(shepherd-service
(documentation (string-append "R-Shiny service for " binary))
(provision (list (symbol-append 'rshiny- (string->symbol
(string-take binary 9)))))
(requirement '(networking))
(start
#~(exec-command
(list
#$(string-append "/run/current-system/profile/bin/" binary))
;#:log-file #$(string-append "/var/log/" binary ".log") ; kills shepherd
#:environment-variables
(list "R_LIBS_USER=/run/current-system/profile/site-library/")
#:log-file #$(string-append "/var/log/rshiny-" (package-name package) ".log")))
;; Now lets try it with fork+exec
;; Outcome: shepherd says failed, runs in the background.
;(start
; #~(fork+exec-command
; (list
; #$(string-append "/run/current-system/profile/bin/" binary))
; #:environment-variables
; (list "R_LIBS_USER=/run/current-system/profile/site-library/")))
;; More fork+exec trials, this time with a log file:
;; Outcome: shepherd says failed, runs in the background, log populated.
;(start
; #~(fork+exec-command
; (list
; "/run/current-system/profile/bin/nohup"
; #$(string-append "/run/current-system/profile/bin/" binary) "&")
; #:log-file #$(string-append "/var/log/" binary ".log")
; #:environment-variables
; (list "R_LIBS_USER=/run/current-system/profile/site-library/")))
;; Now lets try it with make-forkexec:
;; Outcome: Kills shepherd, does not run in the background.
;(start
; #~(make-forkexec-command
; (list
; "/run/current-system/profile/bin/nohup"
; #$(string-append "/run/current-system/profile/bin/" binary) "&")
; "/run/current-system/profile/bin/bash" "-c"
; #$(string-append "/run/current-system/profile/bin/" binary))
; #:environment-variables
; (list "R_LIBS_USER=/run/current-system/profile/site-library/")))
(stop #~(make-kill-destructor)))))))
(define rshiny-service-type
(service-type
(name 'rshiny)
(extensions
(list
(service-extension shepherd-root-service-type
rshiny-shepherd-service)
(service-extension profile-service-type
;; We want the package installed so that it
;; pulls in the propagated inputs as well.
(lambda (config)
(list
(rshiny-configuration-package config))))))
(description
"Run an R-Shiny webapp as a Guix Service.")))
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