services: monitoring: Add 'zabbix-server'.

* gnu/services/monitoring.scm (uglify-field-name, serialize-field,
serialize-number, serialize-list, serialize-string, group?, serialize-group,
include-files?, serialize-include-files, zabbix-server-account,
zabbix-server-config-file, zabbix-server-activation,
zabbix-server-shepherd-service, generate-zabbix-server-documentation,
extra-options, serialize-extra-options): New procedures.
(zabbix-server-service-type): New variable.
* gnu/tests/monitoring.scm (%psql-user-create-zabbix,
%psql-db-zabbix-create-script, %psql-db-create-zabbix, %psql-db-import-zabbix,
%zabbix-os, %test-zabbix): New variables.
(run-zabbix-server-test): New procedure.
* doc/guix.texi (Monitoring Services): Document 'zabbix-server'.

squash! services: monitoring: Add 'zabbix-server'.

1 files changed, 190 insertions, 1 deletions

diff --git a/gnu/services/monitoring.scm b/gnu/services/monitoring.scm
index aa3b63a0e4..cb1f71ebff 100644
--- a/gnu/services/monitoring.scm
+++ b/gnu/services/monitoring.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2018 Sou Bunnbu <iyzsong@member.fsf.org>
 ;;; Copyright © 2018 Gábor Boskovits <boskovits@gmail.com>
+;;; Copyright © 2018 Oleg Pykhalov <go.wigust@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -19,17 +20,23 @@
 
 (define-module (gnu services monitoring)
   #:use-module (gnu services)
+  #:use-module (gnu services configuration)
   #:use-module (gnu services shepherd)
   #:use-module (gnu packages admin)
   #:use-module (gnu packages monitoring)
   #:use-module (gnu system shadow)
   #:use-module (guix gexp)
+  #:use-module (guix packages)
   #:use-module (guix records)
   #:use-module (ice-9 match)
+  #:use-module (srfi srfi-26)
   #:export (darkstat-configuration
             prometheus-node-exporter-configuration
             darkstat-service-type
-            prometheus-node-exporter-service-type))
+            prometheus-node-exporter-service-type
+
+            zabbix-server-configuration
+            zabbix-server-service-type))
 
 
 ;;;
@@ -125,3 +132,185 @@ prometheus.")
     (list (service-extension
            shepherd-root-service-type
            (compose list prometheus-node-exporter-shepherd-service))))))
+
+
+;;;
+;;; Zabbix server
+;;;
+
+(define (uglify-field-name field-name)
+  (apply string-append
+         (map (lambda (str)
+                (if (member (string->symbol str) '(ca db ssl))
+                    (string-upcase str)
+                    (string-capitalize str)))
+              (string-split (string-delete #\?
+                                           (symbol->string field-name))
+                            #\-))))
+
+(define (serialize-field field-name val)
+  (format #t "~a=~a~%" (uglify-field-name field-name) val))
+
+(define (serialize-number field-name val)
+  (serialize-field field-name (number->string val)))
+
+(define (serialize-list field-name val)
+  (if (null? val) "" (serialize-field field-name (string-join val ","))))
+
+(define (serialize-string field-name val)
+  (if (and (string? val) (string=? val ""))
+      ""
+      (serialize-field field-name val)))
+
+(define group? string?)
+
+(define serialize-group
+  (const ""))
+
+(define include-files? list?)
+
+(define (serialize-include-files field-name val)
+  (if (null? val) "" (for-each (cut serialize-field 'include <>) val)))
+
+(define extra-options? string?)
+
+(define (serialize-extra-options field-name val)
+  (if (null? val) "" (display val)))
+
+(define-configuration zabbix-server-configuration
+  (zabbix-server
+   (package zabbix-server)
+   "The zabbix-server package.")
+  (user
+   (string "zabbix")
+   "User who will run the Zabbix server.")
+  (group ;for zabbix-server-account procedure
+   (group "zabbix")
+   "Group who will run the Zabbix server.")
+  (db-host
+   (string "127.0.0.1")
+   "Database host name.")
+  (db-name
+   (string "zabbix")
+   "Database name.")
+  (db-user
+   (string "zabbix")
+   "Database user.")
+  (db-password
+   (string "")
+   "Database password.  Please, use @code{include-files} with
+@code{DBPassword=SECRET} inside a specified file instead.")
+  (db-port
+   (number 5432)
+   "Database port.")
+  (log-type
+   (string "")
+   "Specifies where log messages are written to:
+@itemize
+@item @code{system} - syslog.
+@item @code{file} - file specified with @code{log-file} parameter.
+@item @code{console} - standard output.
+@end itemize\n")
+  (log-file
+   (string "/var/log/zabbix/server.log")
+   "Log file name for @code{log-type} @code{file} parameter.")
+  (pid-file
+   (string  "/var/run/zabbix/zabbix_server.pid")
+   "Name of PID file.")
+  (ssl-ca-location
+   (string "/etc/ssl/certs/ca-certificates.crt")
+   "The location of certificate authority (CA) files for SSL server
+certificate verification.")
+  (ssl-cert-location
+   (string "/etc/ssl/certs")
+   "Location of SSL client certificates.")
+  (extra-options
+   (extra-options "")
+   "Extra options will be appended to Zabbix server configuration file.")
+  (include-files
+   (include-files '())
+   "You may include individual files or all files in a directory in the
+configuration file."))
+
+(define (zabbix-server-account config)
+  "Return the user accounts and user groups for CONFIG."
+  (let ((zabbix-user (zabbix-server-configuration-user config))
+        (zabbix-group (zabbix-server-configuration-group config)))
+    (list (user-group (name zabbix-group) (system? #t))
+          (user-account
+           (name zabbix-user)
+           (system? #t)
+           (group zabbix-group)
+           (comment "zabbix privilege separation user")
+           (home-directory (string-append "/var/run/" zabbix-user))
+           (shell #~(string-append #$shadow "/sbin/nologin"))))))
+
+(define (zabbix-server-config-file config)
+  "Return the zabbix-server configuration file corresponding to CONFIG."
+  (computed-file
+   "zabbix_server.conf"
+   #~(begin
+       (call-with-output-file #$output
+         (lambda (port)
+           (display "# Generated by 'zabbix-server-service'.\n" port)
+           (display #$(with-output-to-string
+                        (lambda ()
+                          (serialize-configuration
+                           config zabbix-server-configuration-fields)))
+                    port)
+           #t)))))
+
+(define (zabbix-server-activation config)
+  "Return the activation gexp for CONFIG."
+  (with-imported-modules '((guix build utils)
+                           (ice-9 rdelim))
+    #~(begin
+        (use-modules (guix build utils)
+                     (ice-9 rdelim))
+        (let ((user (getpw #$(zabbix-server-configuration-user config))))
+          (for-each (lambda (file)
+                      (let ((directory (dirname file)))
+                        (mkdir-p directory)
+                        (chown directory (passwd:uid user) (passwd:gid user))
+                        (chmod directory #o755)))
+                    (list #$(zabbix-server-configuration-log-file config)
+                          #$(zabbix-server-configuration-pid-file config)
+                          "/etc/zabbix/maintenance.inc.php"))))))
+
+(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\
+/etc/ssl/certs"
+                         "SSL_CERT_FILE=/run/current-system/profile\
+/etc/ssl/certs/ca-certificates.crt")))
+         (stop #~(make-kill-destructor)))))
+
+(define zabbix-server-service-type
+  (service-type
+   (name 'zabbix-server)
+   (extensions
+    (list (service-extension shepherd-root-service-type
+                             zabbix-server-shepherd-service)
+          (service-extension account-service-type
+                             zabbix-server-account)
+          (service-extension activation-service-type
+                             zabbix-server-activation)))
+   (default-value (zabbix-server-configuration))))
+
+(define (generate-zabbix-server-documentation)
+  (generate-documentation
+   `((zabbix-server-configuration
+      ,zabbix-server-configuration-fields))
+   'zabbix-server-configuration))