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(define-module (px services log)
  #:use-module (gnu)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages base)
  #:use-module (gnu packages bash)
  #:use-module (gnu packages linux)
  #:use-module (gnu packages logging)
  #:use-module (gnu packages screen)
  #:use-module (gnu services shepherd)
  #:use-module (px  packages log)
  #:use-module (gnu system)
  #:use-module (gnu system shadow)
  #:use-module (guix gexp)
  #:use-module (guix records)
  #:use-module (ice-9 match)
  #:use-module (ice-9 pretty-print)

  #:export (remote-syslog-service-configuration
            remote-syslog-service-type

            %rsyslog-default-config
            %rsyslog-default-config-file
            rsyslog-configuration
            rsyslog-service-type))

;;
;; remote-syslog SERVICE
;;

(define (script-builder destionation-host destionation-port hostname log-files package)
  "Return the chorny configuration file corresponding to CONFIG."
  (computed-file "remote-syslog-script.sh"
       (with-imported-modules
  '((guix build utils))
  #~(begin
      (use-modules (guix build utils))
      (call-with-output-file #$output
        (lambda (port)
          (format port "#!~a~% exec ~a \"$@\"~%"
                  #+(file-append bash "/bin/sh")
                  (string-append #$package "/bin/remote_syslog2"
                                    " --no-detach" 
                                    " -d " #$destionation-host
                                    " -p " #$destionation-port
                                    " --pid-file=/var/run/remote_syslog.pid"
                                    " --hostname " #$hostname
                                    " " #$log-files))
          (chmod port #o555)))))))

(define-record-type* <remote-syslog-service-configuration>
  remote-syslog-service-configuration make-remote-syslog-service-configuration
  remote-syslog-service-configuration?
  (destionation-host  remote-syslog-service-configuration-destionation-host
          (default "logs.papertrailapp.com"))
  (destionation-port  remote-syslog-service-configuration-destionation-port
          (default "46169"))
  (hostname           remote-syslog-service-configuration-host
          (default "$(hostname)"))
  (log-files          remote-syslog-service-configuration-log-files
          (default "/var/log/messages"))
  (package            remote-syslog-service-configuration-package
          (default remote_syslog2)))

(define remote-syslog-shepherd-service
  (match-lambda
    (($ <remote-syslog-service-configuration> destionation-host destionation-port hostname log-files package)
      (list (shepherd-service
              (provision '(remote-syslog))
              (documentation "Run remote-syslog as a daemon")
              (requirement '(networking syslogd))
              (start #~(make-forkexec-constructor
                        (list #$(script-builder destionation-host destionation-port hostname log-files package))))
              (stop #~(make-kill-destructor)))))))

(define remote-syslog-service-type
  (service-type
   (name "remote-syslog")
   (description "Remote syslog service")
   (extensions (list (service-extension shepherd-root-service-type
                                        remote-syslog-shepherd-service)))
   (default-value (remote-syslog-service-configuration))))


;;
;; rsyslog-service-type
;;

(define %rsyslog-default-config
  "## full conf created by rsyslog version 8.2204.1 at 2023-01-02 16:44:08 ##

$ModLoad imuxsock # provides support for local system logging (e.g. via logger command)
$ModLoad imklog   # provides kernel logging support (previously done by rklogd)
$ModLoad immark  # provides --MARK-- message capability

$ModLoad imudp
$UDPServerRun 514

$ModLoad imtcp
$InputTCPServerRun 514

$WorkDirectory /var/lib/rsyslog
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat

*.* /var/log/rsyslog
")


(define %rsyslog-default-config-file
  (plain-file "rsyslog.conf" %rsyslog-default-config))


(define-record-type* <rsyslog-configuration>
  rsyslog-configuration make-rsyslog-cofiguration
  rsyslog-configuration?
  (package     rsyslog-configuration-package
               (default rsyslog))
  (config-file rsyslog-configuration-config-file
               (default %rsyslog-default-config-file)))


(define (rsyslog-activation config)
  (with-imported-modules '((guix build utils))
                         #~(begin
                             (use-modules ((guix build utils)))
                             (let ((lib-dir "/var/lib/rsyslog"))
                               (mkdir-p lib-dir)))))


(define rsyslog-shepherd-service
  (match-lambda
    (($ <rsyslog-configuration> package config-file)
     (list
      (shepherd-service
       (provision '(rsyslogd))
       (documentation "Rsyslog daemon service")
       (requirement '(syslogd))
       (start #~(make-forkexec-constructor
                 (list #$(file-append package "/sbin/rsyslogd")
                       "-n" "-f" #$config-file)))
       (stop #~(make-kill-destructor)))))))


(define rsyslog-service-type
  (service-type
   (name 'rsyslog)
   (description "Run rsyslog daemon on machine")
   (extensions
    (list (service-extension shepherd-root-service-type
                             rsyslog-shepherd-service)
          (service-extension activation-service-type
                             rsyslog-activation)))
   (default-value (rsyslog-configuration))))