services: Add Varnish service.

* gnu/services/web.scm (<varnish-configuration>): New record type.
(%varnish-accounts, %varnish-service-type): New variables.
(varnish-shepherd-service): New procedure.
* gnu/tests/web.scm (%varnish-vcl, %varnish-os): New variables.
(%test-varnish): New test.
* doc/guix.texi (Web Services): Document it.

1 files changed, 41 insertions, 0 deletions

diff --git a/gnu/tests/web.scm b/gnu/tests/web.scm
index 45fcb668fb..bcc919137b 100644
--- a/gnu/tests/web.scm
+++ b/gnu/tests/web.scm
@@ -32,6 +32,7 @@
   #:use-module (guix store)
   #:export (%test-httpd
             %test-nginx
+            %test-varnish
             %test-php-fpm
             %test-hpcguix-web
             %test-tailon))
@@ -169,6 +170,46 @@ HTTP-PORT."
 
 
 ;;;
+;;; Varnish
+;;;
+
+(define %varnish-vcl
+  (mixed-text-file
+   "varnish-test.vcl"
+   "vcl 4.0;
+backend dummy { .host = \"127.1.1.1\"; }
+sub vcl_recv { return(synth(200, \"OK\")); }
+sub vcl_synth {
+  synthetic(\"" %index.html-contents "\");
+  set resp.http.Content-Type = \"text/plain\";
+  return(deliver);
+}"))
+
+(define %varnish-os
+  (simple-operating-system
+   (dhcp-client-service)
+   ;; Pretend to be a web server that serves %index.html-contents.
+   (service varnish-service-type
+            (varnish-configuration
+             (name "/tmp/server")
+             ;; Use a small VSL buffer to fit in the test VM.
+             (parameters '(("vsl_space" . "4M")))
+             (vcl %varnish-vcl)))
+   ;; Proxy the "server" using the builtin configuration.
+   (service varnish-service-type
+            (varnish-configuration
+             (parameters '(("vsl_space" . "4M")))
+             (backend "localhost:80")
+             (listen '(":8080"))))))
+
+(define %test-varnish
+  (system-test
+   (name "varnish")
+   (description "Test the Varnish Cache server.")
+   (value (run-webserver-test "varnish-default" %varnish-os))))
+
+
+;;;
 ;;; PHP-FPM
 ;;;