From f0fe07a65d84c707f38abeef8804a48df12f6335 Mon Sep 17 00:00:00 2001
From: Christopher Baines <mail@cbaines.net>
Date: Tue, 22 Aug 2017 11:15:39 +0100
Subject: services: Add elasticsearch.

---
 gnu/services/databases.scm | 107 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)

diff --git a/gnu/services/databases.scm b/gnu/services/databases.scm
index aff78a0566..a6c0afab8c 100644
--- a/gnu/services/databases.scm
+++ b/gnu/services/databases.scm
@@ -51,6 +51,18 @@
             postgresql-service
             postgresql-service-type
 
+            <elasticsearch-configuration>
+            elasticsearch-configuration
+            elasticsearch-configuration?
+            elasticsearch-configuration-elasticsearch
+            elasticsearch-configuration-data-path
+            elasticsearch-configuration-logs-path
+            elasticsearch-configuration-port
+            elasticsearch-configuration-transport-port
+
+            elasticsearch-service
+            elasticsearch-service-type
+
             memcached-service-type
             <memcached-configuration>
             memcached-configuration
@@ -266,6 +278,101 @@ and stores the database cluster in @var{data-directory}."
             (config-file config-file)
             (data-directory data-directory))))
 
+
+;;;
+;;; Elasticsearch
+;;;
+
+(define-record-type* <elasticsearch-configuration>
+  elasticsearch-configuration make-elasticsearch-configuration
+  elasticsearch-configuration?
+  (elasticsearch     elasticsearch-configuration-elasticsearch
+                     (default elasticsearch))
+  (data-path         elasticsearch-configuration-data-path
+                     (default "/var/lib/"))
+  (logs-path         elasticsearch-configuration-logs-path
+                     (default "/var/log/elasticsearch"))
+  (http-port         elasticsearch-configuration-port
+                     (default 9200))
+  (transport-port    elasticsearch-configuration-transport-port
+                     (default 9300)))
+
+(define (elasticsearch-configuration-directory
+         data-path logs-path http-port transport-port)
+  (computed-file
+   "elasticsearch-config"
+   #~(begin
+       (mkdir #$output)
+       (mkdir (string-append #$output "/scripts"))
+       (call-with-output-file (string-append #$output "/elasticsearch.yml")
+         (lambda (port)
+           (display
+            (string-append
+             "path.data: " #$data-path "\n"
+             "path.logs: " #$logs-path "\n"
+             "http.port: " #$(number->string http-port) "\n"
+             "transport.tcp.port: " #$(number->string transport-port) "\n")
+            port))))))
+
+(define %elasticsearch-accounts
+  (list (user-group (name "elasticsearch") (system? #t))
+        (user-account
+         (name "elasticsearch")
+         (group "elasticsearch")
+         (system? #t)
+         (comment "Elasticsearch server user")
+         (home-directory "/var/empty")
+         (shell (file-append shadow "/sbin/nologin")))))
+
+(define elasticsearch-activation
+  (match-lambda
+    (($ <elasticsearch-configuration> elasticsearch data-path logs-path
+                                      http-port transport-port)
+     #~(begin
+         (use-modules (guix build utils)
+                      (ice-9 match))
+
+         (let ((user (getpwnam "elasticsearch")))
+           ;; Create db state directory.
+           (for-each
+            (lambda (path)
+              (mkdir-p path)
+              (chown path (passwd:uid user) (passwd:gid user)))
+            '(#$data-path #$logs-path "/var/run/elasticsearch")))))))
+
+(define elasticsearch-shepherd-service
+  (match-lambda
+    (($ <elasticsearch-configuration> elasticsearch data-path logs-path
+                                      http-port transport-port)
+     (list (shepherd-service
+            (provision '(elasticsearch))
+            (documentation "Run the Elasticsearch daemon.")
+            (requirement '(user-processes syslogd))
+            (start #~(make-forkexec-constructor
+                      (list
+                       (string-append #$elasticsearch "/bin/elasticsearch")
+                       "-d"
+                       "-p" "/var/run/elasticsearch/pid"
+                       (string-append
+                        "-Dpath.conf="
+                        #$(elasticsearch-configuration-directory
+                           data-path logs-path http-port transport-port)))
+                      #:user "elasticsearch"
+                      #:pid-file "/var/run/elasticsearch/pid"
+                      #:log-file "/var/log/elasticsearch.log"))
+            (stop #~(make-kill-destructor)))))))
+
+(define elasticsearch-service-type
+  (service-type (name 'elasticsearch)
+                (extensions
+                 (list (service-extension shepherd-root-service-type
+                                          elasticsearch-shepherd-service)
+                       (service-extension activation-service-type
+                                          elasticsearch-activation)
+                       (service-extension account-service-type
+                                          (const %elasticsearch-accounts))))
+                (default-value (elasticsearch-configuration))))
+
 
 ;;;
 ;;; Memcached
-- 
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