;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 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 services herd)
  #:use-module (guix ui)
  #:use-module (guix utils)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-11)
  #:use-module (ice-9 match)
  #:export (current-services
            unload-services
            unload-service
            load-services
            start-service))

;;; Commentary:
;;;
;;; This module provides an interface to the GNU Shepherd, similar to the
;;; 'herd' command.  Essentially it implements a subset of the (shepherd comm)
;;; module, but focusing only on the parts relevant to 'guix system
;;; reconfigure'.
;;;
;;; Code:

(define %shepherd-socket-file
  "/var/run/shepherd/socket")

(define* (open-connection #:optional (file %shepherd-socket-file))
  "Open a connection to the daemon, using the Unix-domain socket at FILE, and
return the socket."
  ;; The protocol is sexp-based and UTF-8-encoded.
  (with-fluids ((%default-port-encoding "UTF-8"))
    (let ((sock    (socket PF_UNIX SOCK_STREAM 0))
          (address (make-socket-address PF_UNIX file)))
      (catch 'system-error
        (lambda ()
          (connect sock address)
          (setvbuf sock _IOFBF 1024)
          sock)
        (lambda args
          (close-port sock)
          (apply throw args))))))

(define-syntax-rule (with-shepherd connection body ...)
  "Evaluate BODY... with CONNECTION bound to an open socket to PID 1."
  (let ((connection (open-connection)))
    body ...))

(define (report-action-error error)
  "Report ERROR, an sexp received by a shepherd client in reply to COMMAND, a
command object."
  (match error
    (('error ('version 0 x ...) 'service-not-found service)
     (report-error (_ "service '~a' could not be found")
                   service))
    (('error ('version 0 x ...) 'action-not-found action service)
     (report-error (_ "service '~a' does not have an action '~a'")
                   service action))
    (('error ('version 0 x ...) 'action-exception action service
             key (args ...))
     (report-error (_ "exception caught while executing '~a' \
on service '~a':")
                   action service)
     (print-exception (current-error-port) #f key args))
    (('error . _)
     (report-error (_ "something went wrong: ~s")
                   error))
    (#f                                           ;not an error
     #t)))

(define (display-message message)
  ;; TRANSLATORS: Nothing to translate here.
  (info (_ "shepherd: ~a~%") message))

(define* (invoke-action service action arguments cont)
  "Invoke ACTION on SERVICE with ARGUMENTS.  On success, call CONT with the
result.  Otherwise return #f."
  (with-shepherd sock
    (write `(shepherd-command (version 0)
                              (action ,action)
                              (service ,service)
                              (arguments ,arguments)
                              (directory ,(getcwd)))
           sock)
    (force-output sock)

    (match (read sock)
      (('reply ('version 0 _ ...) ('result (result)) ('error #f)
               ('messages messages))
       (for-each display-message messages)
       (cont result))
      (('reply ('version 0 x ...) ('result y) ('error error)
               ('messages messages))
       (for-each display-message messages)
       (report-action-error error)
       #f)
      (x
       (warning (_ "invalid shepherd reply~%"))
       #f))))

(define-syntax-rule (with-shepherd-action service (action args ...)
                      result body ...)
  (invoke-action service action (list args ...)
                 (lambda (result) body ...)))

(define-syntax alist-let*
  (syntax-rules ()
    "Bind the given KEYs in EXP to the corresponding items in ALIST.  ALIST
is assumed to be a list of two-element tuples rather than a traditional list
of pairs."
    ((_ alist (key ...) exp ...)
     (let ((key (and=> (assoc-ref alist 'key) car)) ...)
       exp ...))))

(define (current-services)
  "Return two lists: the list of currently running services, and the list of
currently stopped services."
  (with-shepherd-action 'root ('status) services
    (match services
      ((('service ('version 0 _ ...) _ ...) ...)
       (fold2 (lambda (service running-services stopped-services)
                (alist-let* service (provides running)
                  (if running
                      (values (cons (first provides) running-services)
                              stopped-services)
                      (values running-services
                              (cons (first provides) stopped-services)))))
              '()
              '()
              services))
      (x
       (warning (_ "failed to obtain list of shepherd services~%"))
       (values #f #f)))))

(define (unload-service service)
  "Unload SERVICE, a symbol name; return #t on success."
  (with-shepherd-action 'root ('unload (symbol->string service)) result
    result))

(define (%load-file file)
  "Load FILE in the Shepherd."
  (with-shepherd-action 'root ('load file) result
    result))

(define (eval-there exp)
  "Eval EXP in the Shepherd."
  (with-shepherd-action 'root ('eval (object->string exp)) result
    result))

(define (load-services files)
  "Load and register the services from FILES, where FILES contain code that
returns a shepherd <service> object."
  (eval-there `(register-services
                ,@(map (lambda (file)
                         `(primitive-load ,file))
                       files))))

(define (start-service name)
  (with-shepherd-action name ('start) result
    result))

;; Local Variables:
;; eval: (put 'alist-let* 'scheme-indent-function 2)
;; eval: (put 'with-shepherd 'scheme-indent-function 1)
;; eval: (put 'with-shepherd-action 'scheme-indent-function 3)
;; End:

;;; herd.scm ends here
