Put in earplugs
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;;; SPDX-License-Identifier: GPL-3.0-or-later
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;;; Copyright © 2023 Giacomo Leidi <goodoldpaul@autistici.org>
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;; via https://git.sr.ht/~fishinthecalculator/gocix/tree/main/item/modules/oci/services/grafana.scm
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;; and see also https://fishinthecalculator.me/blog/monitor-your-guix-system-with-grafana.html
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(define-module (zzkt services grafana)
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#:use-module (gnu packages admin)
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#:use-module (gnu services)
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#:use-module (gnu services configuration)
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#:use-module (gnu services docker)
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#:use-module (gnu system shadow)
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#:use-module (guix gexp)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 string-fun)
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#:export (grafana-service-type
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grafana-configuration
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grafana-configuration?
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grafana-configuration-fields
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grafana-configuration-datadir
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grafana-configuration-image
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grafana-configuration-port
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grafana-configuration-grafana.ini
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grafana-configuration-network
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grafana-configuration->container-configuration
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%grafana-accounts
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%grafana-activation
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grafana-configuration
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grafana-configuration?
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grafana-configuration-fields
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grafana-configuration-server
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grafana-configuration-smtp
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grafana-configuration-extra-content
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grafana-server-configuration
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grafana-server-configuration?
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grafana-server-configuration-fields
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grafana-server-configuration-root-url
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grafana-server-configuration-serve-from-subpath?
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grafana-smtp-configuration
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grafana-smtp-configuration?
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grafana-smtp-configuration-fields
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grafana-smtp-configuration-enabled?
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grafana-smtp-configuration-host
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grafana-smtp-configuration-user
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grafana-smtp-configuration-password
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grafana-smtp-configuration-from-address))
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;; Some of this code comes from the Guix manual.
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;; Check it out! It's pretty cool.
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(define grafana-tag
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"10.1.5")
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(define grafana-image
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(string-append "bitnami/grafana:" grafana-tag))
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;; Turn field names, which are Scheme symbols into strings
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(define (uglify-field-name field-name)
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(string-replace-substring
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(string-replace-substring
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(symbol->string field-name) "?" "") "-" "_"))
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(define (serialize-string field-name value)
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#~(string-append #$(uglify-field-name field-name) " = " #$value "\n"))
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(define (serialize-integer field-name value)
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(serialize-string field-name (number->string value)))
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(define (serialize-boolean field-name value)
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(serialize-string field-name (if value "true" "false")))
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(define (gf-serialize-grafana-server-configuration field-name value)
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#~(string-append
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"[server]\n"
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#$(serialize-configuration
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value grafana-server-configuration-fields)))
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(define-configuration grafana-server-configuration
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(domain
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(string "example.org")
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"The public host where grafana will be exposed.")
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(root-url
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(string "%(protocol)s://%(domain)s:%(http_port)s/")
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"The url where grafana will be exposed.")
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(serve-from-sub-path?
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(boolean #f)
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"The image to use for the OCI backed Shepherd service."))
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(define (gf-serialize-grafana-smtp-configuration field-name value)
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#~(string-append
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"[smtp]\n"
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#$(serialize-configuration
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value grafana-smtp-configuration-fields)))
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(define-configuration grafana-smtp-configuration
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(enabled?
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(boolean #f)
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"Whether to enable Grafana's email alerting.")
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(host
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(string "smtp.example.org:587")
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"The connection string representing your SMTP server.")
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(user
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(string "you@example.org")
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"The email used to authenticate with the SMTP server.")
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(password
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(string "")
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"The password used to authenticate with the SMTP server.")
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(from-address
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(string "alert@example.org")
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"The sender of the email alerts Grafana will send."))
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(define (gf-serialize-grafana-configuration configuration)
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(mixed-text-file
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"grafana.ini"
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(serialize-configuration
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configuration grafana-configuration-fields)))
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(define (gf-serialize-string field-name value)
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value)
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(define-maybe string)
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(define-configuration grafana-configuration
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(server
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(grafana-server-configuration (grafana-server-configuration))
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"grafana.ini's [server] section.")
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(smtp
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(grafana-smtp-configuration (grafana-smtp-configuration))
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"grafana.ini's [smtp] section.")
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(extra-content
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(string "")
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"Everything you want to manually add to grafana.ini.")
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(prefix gf-))
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(define-configuration grafana-configuration
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(datadir
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(string "/var/lib/grafana")
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"The directory where grafana writes state.")
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(image
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(string grafana-image)
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"The image to use for the OCI backed Shepherd service.")
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(port
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(string "3000")
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"This host port will be mapped onto the Grafana configured port inside the container.")
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(grafana.ini
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(grafana-configuration (grafana-configuration))
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"This field will be serialized as graphana.ini.")
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(network
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(maybe-string)
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"The docker network where the grafana container will be attached. When equal
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to \"host\" the @code{port} field will be ignored.")
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(no-serialization))
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(define %grafana-accounts
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(list (user-account
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(name "grafana")
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(comment "Grafana's Service Account")
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(uid 1001)
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(group "root")
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(supplementary-groups '("tty"))
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(system? #t)
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(home-directory "/var/empty")
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(shell (file-append shadow "/sbin/nologin")))))
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(define (%grafana-activation config)
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"Return an activation gexp for Grafana."
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(let* ((datadir (grafana-configuration-datadir config))
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(grafana.ini
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(mixed-text-file
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"grafana.ini"
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(serialize-configuration (grafana-configuration-grafana.ini config)
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grafana-configuration-fields))))
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#~(begin
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(use-modules (guix build utils))
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(let* ((user (getpwnam "grafana"))
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(uid (passwd:uid user))
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(gid (passwd:gid user))
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(datadir #$datadir))
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;; Setup datadir
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(mkdir-p datadir)
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(chown datadir uid gid)
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;; Activate configuration
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(activate-special-files
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'(("/etc/grafana/grafana.ini"
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#$grafana.ini)))))))
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(define grafana-configuration->container-configuration
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(lambda (config)
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(let* ((datadir
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(grafana-configuration-datadir config))
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(grafana.ini (grafana-configuration-grafana.ini config))
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(network
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(grafana-configuration-network config))
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(image
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(grafana-configuration-image config))
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(port
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(grafana-configuration-port config))
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(container-config
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(container-configuration
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(image image)
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(ports
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`((,port . "3000")))
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(volumes
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`((,datadir . "/var/lib/grafana")
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;; Needed because grafana.ini is a symlink to an item in the store.
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("/gnu/store" . "/gnu/store")
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("/etc/grafana/grafana.ini" . "/opt/bitnami/grafana/conf/grafana.ini"))))))
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(list
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(if (maybe-value-set? network)
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(container-configuration
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(inherit container-config)
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(network network))
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container-config)))))
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(define grafana-service-type
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(service-type (name 'grafana)
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(extensions (list (service-extension container-service-type
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grafana-configuration->container-configuration)
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(service-extension account-service-type
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(const %grafana-accounts))
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(service-extension activation-service-type
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%grafana-activation)))
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(default-value (grafana-configuration))
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(description
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"Grafana as Shepherd Service.")))
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