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services: zabbix-server: Add shepherd actions for runtime control commands.

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* gnu/services/monitoring.scm (zabbix-server-runtime-control-procedure,
zabbix-server-actions): New variables.
(zabbix-server-shepherd-service)[actions]: New field.  Let-bind variables
common between actions and the start procedure.
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Marius Bakke 2022-01-28 14:34:59 +01:00
parent 0d347fe83e
commit 5122805c48
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1 changed files with 60 additions and 16 deletions
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76
gnu/services/monitoring.scm
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@ -2,6 +2,7 @@
;;; Copyright © 2018 Sou Bunnbu <iyzsong@member.fsf.org>
;;; Copyright © 2018, 2019 Gábor Boskovits <boskovits@gmail.com>
;;; Copyright © 2018, 2019, 2020 Oleg Pykhalov <go.wigust@gmail.com>
;;; Copyright © 2022 Marius Bakke <marius@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -334,7 +335,6 @@ (define (zabbix-server-activation config)
#~(begin
(use-modules (guix build utils)
(ice-9 rdelim))
(let ((user (getpw #$(zabbix-server-configuration-user config))))
(for-each (lambda (file)
(let ((directory (dirname file)))
@ -345,25 +345,69 @@ (define (zabbix-server-activation config)
#$(zabbix-server-configuration-pid-file config)
"/etc/zabbix/maintenance.inc.php"))))))
(define (zabbix-server-runtime-control-procedure zabbix-server config command)
;; XXX: This is duplicated from mcron; factorize.
#~(lambda (_ . args)
;; Run 'zabbix_server' in a pipe so we can explicitly redirect its output
;; to 'current-output-port', which at this stage is bound to the client
;; connection.
(let ((pipe (apply open-pipe* OPEN_READ #$zabbix-server
"--config" #$config
"-R" #$command args)))
(let loop ()
(match (read-line pipe 'concat)
((? eof-object?)
(catch 'system-error
(lambda ()
(zero? (close-pipe pipe)))
(lambda args
;; There's a race with the SIGCHLD handler, which could
;; call 'waitpid' before 'close-pipe' above does. If we
;; get ECHILD, that means we lost the race; in that case, we
;; cannot tell what the exit code was (FIXME).
(or (= ECHILD (system-error-errno args))
(apply throw args)))))
(line
(display line)
(loop)))))))
;; Provide shepherd actions for common "zabbix_server -R" commands
;; mainly for a convenient way to use the correct configuration file.
(define (zabbix-server-actions zabbix-server config)
(list (shepherd-action
(name 'reload-config-cache)
(documentation "Reload the configuration cache.")
(procedure (zabbix-server-runtime-control-procedure
zabbix-server config "config_cache_reload")))
(shepherd-action
(name 'reload-snmp-cache)
(documentation "Reload SNMP cache.")
(procedure (zabbix-server-runtime-control-procedure
zabbix-server config "snmp_cache_reload")))))
(define (zabbix-server-shepherd-service config)
"Return a <shepherd-service> for Zabbix server with CONFIG."
(list (shepherd-service
(provision '(zabbix-server))
(documentation "Run Zabbix server daemon.")
(start #~(make-forkexec-constructor
(list #$(file-append (zabbix-server-configuration-zabbix-server config)
"/sbin/zabbix_server")
"--config" #$(zabbix-server-config-file config)
"--foreground")
#:user #$(zabbix-server-configuration-user config)
#:group #$(zabbix-server-configuration-group config)
#:pid-file #$(zabbix-server-configuration-pid-file config)
#:environment-variables
(list "SSL_CERT_DIR=/run/current-system/profile\
(let ((zabbix-server
(file-append (zabbix-server-configuration-zabbix-server config)
"/sbin/zabbix_server"))
(config-file (zabbix-server-config-file config)))
(list (shepherd-service
(provision '(zabbix-server))
(documentation "Run the Zabbix server daemon.")
(actions (zabbix-server-actions zabbix-server config-file))
(start #~(make-forkexec-constructor
(list #$zabbix-server
"--config" #$config-file
"--foreground")
#:user #$(zabbix-server-configuration-user config)
#:group #$(zabbix-server-configuration-group config)
#:pid-file #$(zabbix-server-configuration-pid-file config)
#:environment-variables
(list "SSL_CERT_DIR=/run/current-system/profile\
/etc/ssl/certs"
"SSL_CERT_FILE=/run/current-system/profile\
"SSL_CERT_FILE=/run/current-system/profile\
/etc/ssl/certs/ca-certificates.crt")))
(stop #~(make-kill-destructor)))))
(stop #~(make-kill-destructor))))))
(define zabbix-server-service-type
(service-type