From aa72ac94a3223faa287c01557874c3840219e000 Mon Sep 17 00:00:00 2001
From: Timo Wilken
Date: Thu, 7 Dec 2023 23:14:38 +0100
Subject: Generalise Docker service and use it to run Grafana

---
 tw/services/grafana.scm | 60 ++++++++++++++++++++++++++-----------------------
 1 file changed, 32 insertions(+), 28 deletions(-)

(limited to 'tw/services/grafana.scm')

diff --git a/tw/services/grafana.scm b/tw/services/grafana.scm
index a796ba19..2fdb9695 100644
--- a/tw/services/grafana.scm
+++ b/tw/services/grafana.scm
@@ -1,13 +1,12 @@
 (define-module (tw services grafana)
   #:use-module (gnu)
   #:use-module ((gnu packages admin) #:select (shadow))
-  #:use-module ((gnu packages docker) #:select (docker-cli))
   #:use-module (gnu services)
   #:use-module (gnu services configuration)
   #:use-module (gnu services databases)
-  #:use-module (gnu services shepherd)
   #:use-module (guix records)
   #:use-module (tw services web)
+  #:use-module (tw services docker)
   #:export (grafana-service-type
             grafana-configuration))
 
@@ -42,31 +41,36 @@ variables."))
          (home-directory (grafana-configuration-data-path config))
          (shell (file-append shadow "/sbin/nologin")))))
 
-(define (grafana-shepherd-service config)
-  (list (shepherd-service
-         (provision '(grafana))
-         (requirement '(networking))
-         (documentation "Run a Grafana instance using Docker.")
-         (start #~(make-forkexec-constructor
-                   ;; https://grafana.com/docs/grafana/latest/setup-grafana/installation/docker/
-                   (list #$(file-append docker-cli "/bin/docker") "run" "--rm" "--network=host"
-                         "--name" "grafana" "--user" '#$%grafana-user
-                         "-v" '#$(format #f "~a:/var/lib/grafana" (grafana-configuration-data-path config))
-                         "--env-file" '#$(grafana-configuration-metrics-credentials-file config)
-                         ;; https://grafana.com/docs/grafana/latest/setup-grafana/configure-docker/
-                         "-e" "GF_SERVER_PROTOCOL=http"  ; use Wireguard for encryption
-                         "-e" '#$(format #f "GF_SERVER_HTTP_ADDR=~a" (grafana-configuration-bind-address config))
-                         "-e" '#$(format #f "GF_SERVER_HTTP_PORT=~a" (grafana-configuration-host-port config))
-                         "-e" "GF_SERVER_ENABLE_GZIP=true"  ; recommended by docs
-                         "-e" "GF_ANALYTICS_REPORTING_ENABLED=false"
-                         "-e" "GF_ANALYTICS_CHECK_FOR_UPDATES=false"
-                         "-e" "GF_ANALYTICS_CHECK_FOR_PLUGIN_UPDATES=false"
-                         "-e" "GF_SNAPSHOTS_ENABLED=false"  ; disable publishing dashboard snapshots to the internet
-                         "-e" "GF_DATE_FORMATS_INTERVAL_HOUR=DD.MM. HH:mm"  ; use sensible date format
-                         "-e" "GF_DATE_FORMATS_INTERVAL_DAY=DD.MM."         ; use sensible date format
-                         ;; TODO: https://grafana.com/docs/grafana/latest/setup-grafana/configure-grafana/#smtp
-                         '#$(grafana-configuration-container config))))
-         (stop #~(make-kill-destructor)))))
+(define (grafana-environment config)
+  (match-record config <grafana-configuration> (bind-address host-port)
+    (mixed-text-file "grafana.env" "\
+# https://grafana.com/docs/grafana/latest/setup-grafana/configure-docker/
+GF_SERVER_PROTOCOL=http
+GF_SERVER_HTTP_ADDR=" bind-address "
+GF_SERVER_HTTP_PORT=" host-port "
+# gzip compression is recommended by docs, but is not the default
+GF_SERVER_ENABLE_GZIP=true
+GF_ANALYTICS_REPORTING_ENABLED=false
+GF_ANALYTICS_CHECK_FOR_UPDATES=false
+GF_ANALYTICS_CHECK_FOR_PLUGIN_UPDATES=false
+# disable publishing dashboard snapshots to the internet
+GF_SNAPSHOTS_ENABLED=false
+# use sensible date and time formats
+GF_DATE_FORMATS_INTERVAL_HOUR=DD.MM. HH:mm
+GF_DATE_FORMATS_INTERVAL_DAY=DD.MM.
+# TODO: https://grafana.com/docs/grafana/latest/setup-grafana/configure-grafana/#smtp
+")))
+
+(define (grafana-docker-service config)
+  (match-record config <grafana-configuration> (container data-path metrics-credentials-file)
+    (list (docker-container-configuration
+           (name "grafana")
+           (user %grafana-user)
+           (image container)
+           (volumes `((,data-path "/var/lib/grafana" #t)))
+           (environment-files
+            (list (grafana-environment config) metrics-credentials-file))
+           (network-type "host")))))
 
 (define (grafana-reverse-proxy config)
   (match-record config <grafana-configuration> (domain bind-address host-port)
@@ -83,7 +87,7 @@ variables."))
   (service-type
    (name 'grafana)
    (extensions
-    (list (service-extension shepherd-root-service-type grafana-shepherd-service)
+    (list (service-extension docker-container-service-type grafana-docker-service)
           (service-extension account-service-type grafana-accounts)
           (service-extension https-reverse-proxy-service-type grafana-reverse-proxy)))
    (default-value (grafana-configuration))
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