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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017 Clément Lassieur <clement@lassieur.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 messaging)
  #: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 messaging)
  #:use-module (gnu services networking)
  #:use-module (gnu packages messaging)
  #:use-module (guix gexp)
  #:use-module (guix store)
  #:use-module (guix monads)
  #:export (%test-prosody))

(define %base-os
  (operating-system
    (host-name "komputilo")
    (timezone "Europe/Berlin")
    (locale "en_US.UTF-8")

    (bootloader (grub-configuration (device "/dev/sdX")))
    (file-systems %base-file-systems)
    (firmware '())
    (users %base-user-accounts)
    (services (cons (dhcp-client-service)
                    %base-services))))

(define (os-with-service service)
  "Return a test operating system that runs SERVICE."
  (operating-system
    (inherit %base-os)
    (services (cons service
                    (operating-system-user-services %base-os)))))

(define (run-xmpp-test name xmpp-service pid-file create-account)
  "Run a test of an OS running XMPP-SERVICE, which writes its PID to PID-FILE."
  (mlet* %store-monad ((os -> (marionette-operating-system
                               (os-with-service xmpp-service)
                               #:imported-modules '((gnu services herd))))
                       (command (system-qemu-image/shared-store-script
                                 os #:graphic? #f))
                       (username -> "alice")
                       (server -> "localhost")
                       (jid -> (string-append username "@" server))
                       (password -> "correct horse battery staple")
                       (port -> 15222)
                       (message -> "hello world")
                       (witness -> "/tmp/freetalk-witness"))

    (define script.ft
      (scheme-file
       "script.ft"
       #~(begin
           (define (handle-received-message time from nickname message)
             (define (touch file-name)
               (call-with-output-file file-name (const #t)))
             (when (equal? message #$message)
               (touch #$witness)))
           (add-hook! ft-message-receive-hook handle-received-message)

           (ft-set-jid! #$jid)
           (ft-set-password! #$password)
           (ft-set-server! #$server)
           (ft-set-port! #$port)
           (ft-set-sslconn! #f)
           (ft-connect-blocking)
           (ft-send-message #$jid #$message)

           (ft-set-daemon)
           (ft-main-loop))))

    (define test
      (with-imported-modules '((gnu build marionette))
        #~(begin
            (use-modules (gnu build marionette)
                         (srfi srfi-64))

            (define marionette
              ;; Enable TCP forwarding of the guest's port 5222.
              (make-marionette (list #$command "-net"
                                     (string-append "user,hostfwd=tcp::"
                                                    (number->string #$port)
                                                    "-:5222"))))

            (define (guest-wait-for-file file)
              ;; Wait until FILE exists in the guest; 'read' its content and
              ;; return it.
              (marionette-eval
               `(let loop ((i 10))
                  (cond ((file-exists? ,file)
                         (call-with-input-file ,file read))
                        ((> i 0)
                         (begin
                           (sleep 1))
                         (loop (- i 1)))
                        (else
                         (error "file didn't show up" ,file))))
               marionette))

            (define (host-wait-for-file file)
              ;; Wait until FILE exists in the host.
              (let loop ((i 60))
                (cond ((file-exists? file)
                       #t)
                      ((> i 0)
                       (begin
                         (sleep 1))
                       (loop (- i 1)))
                      (else
                       (error "file didn't show up" file)))))

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

            (test-begin "xmpp")

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

            ;; Check XMPP service's PID.
            (test-assert "service process id"
              (let ((pid (number->string (guest-wait-for-file #$pid-file))))
                (marionette-eval `(file-exists? (string-append "/proc/" ,pid))
                                 marionette)))

            ;; Alice sends an XMPP message to herself, with Freetalk.
            (test-assert "client-to-server communication"
              (let ((freetalk-bin (string-append #$freetalk "/bin/freetalk")))
                (marionette-eval '(system* #$create-account #$jid #$password)
                                 marionette)
                ;; Freetalk requires write access to $HOME.
                (setenv "HOME" "/tmp")
                (system* freetalk-bin "-s" #$script.ft)
                (host-wait-for-file #$witness)))

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

    (gexp->derivation name test)))

(define %create-prosody-account
  (program-file
   "create-account"
   #~(begin
       (use-modules (ice-9 match))
       (match (command-line)
         ((command jid password)
          (let ((password-input (format #f "\"~a~%~a\"" password password))
                (prosodyctl #$(file-append prosody "/bin/prosodyctl")))
            (system (string-join
                     `("echo" ,password-input "|" ,prosodyctl "adduser" ,jid)
                     " "))))))))

(define %test-prosody
  (let* ((config (prosody-configuration
                  (virtualhosts
                   (list
                    (virtualhost-configuration
                     (domain "localhost")))))))
    (system-test
     (name "prosody")
     (description "Connect to a running Prosody daemon.")
     (value (run-xmpp-test name
                           (service prosody-service-type config)
                           (prosody-configuration-pidfile config)
                           %create-prosody-account)))))