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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu tests web)
  #:use-module (gnu tests)
  #:use-module (gnu system)
  #:use-module (gnu system grub)
  #:use-module (gnu system file-systems)
  #:use-module (gnu system shadow)
  #:use-module (gnu system vm)
  #:use-module (gnu services)
  #:use-module (gnu services base)
  #:use-module (gnu services web)
  #:use-module (gnu services networking)
  #:use-module (guix gexp)
  #:use-module (guix store)
  #:use-module (guix monads)
  #:export (%test-nginx))

(define %index.html-contents
  ;; Contents of the /index.html file served by nginx.
  "Hello, nginx!")

(define %make-http-root
  ;; Create our server root in /srv.
  #~(begin
      (mkdir "/srv")
      (call-with-output-file "/srv/index.html"
        (lambda (port)
          (display #$%index.html-contents port)))))

(define %nginx-servers
  ;; Server blocks.
  (list (nginx-server-configuration
         (root "/srv")
         (http-port 8042)
         (https-port #f)
         (ssl-certificate #f)
         (ssl-certificate-key #f))))

(define %nginx-os
  ;; Operating system under test.
  (operating-system
    (host-name "komputilo")
    (timezone "Europe/Berlin")
    (locale "en_US.utf8")

    (bootloader (grub-configuration (device "/dev/sdX")))
    (file-systems %base-file-systems)
    (firmware '())
    (users %base-user-accounts)
    (services (cons* (dhcp-client-service)
                     (service nginx-service-type
                              (nginx-configuration
                               (log-directory "/var/log/nginx")
                               (server-blocks %nginx-servers)))
                     (simple-service 'make-http-root activation-service-type
                                     %make-http-root)
                     %base-services))))

(define* (run-nginx-test #:optional (http-port 8042))
  "Run tests in %NGINX-OS, which has nginx running and listening on
HTTP-PORT."
  (mlet* %store-monad ((os ->   (marionette-operating-system
                                 %nginx-os
                                 #:imported-modules '((gnu services herd)
                                                      (guix combinators))))
                       (command (system-qemu-image/shared-store-script
                                 os #:graphic? #f)))
    (define test
      (with-imported-modules '((gnu build marionette))
        #~(begin
            (use-modules (srfi srfi-11) (srfi srfi-64)
                         (gnu build marionette)
                         (web uri)
                         (web client)
                         (web response))

            (define marionette
              ;; Forward the guest's HTTP-PORT, where nginx is listening, to
              ;; port 8080 in the host.
              (make-marionette (list #$command "-net"
                                     (string-append
                                      "user,hostfwd=tcp::8080-:"
                                      #$(number->string http-port)))))

            (mkdir #$output)
            (chdir #$output)

            (test-begin "nginx")

            ;; Wait for nginx to be up and running.
            (test-eq "service running"
              'running!
              (marionette-eval
               '(begin
                  (use-modules (gnu services herd))
                  (start-service 'nginx)
                  'running!)
               marionette))

            ;; Make sure the PID file is created.
            (test-assert "PID file"
              (marionette-eval
               '(file-exists? "/var/run/nginx/pid")
               marionette))

            ;; Retrieve the index.html file we put in /srv.
            (test-equal "http-get"
              '(200 #$%index.html-contents)
              (let-values (((response text)
                            (http-get "http://localhost:8080/index.html"
                                      #:decode-body? #t)))
                (list (response-code response) text)))

            ;; There should be a log file in here.
            (test-assert "log file"
              (marionette-eval
               '(file-exists? "/var/log/nginx/access.log")
               marionette))

            (test-end)
            (exit (= (test-runner-fail-count (test-runner-current)) 0)))))

    (gexp->derivation "nginx-test" test)))

(define %test-nginx
  (system-test
   (name "nginx")
   (description "Connect to a running NGINX server.")
   (value (run-nginx-test))))