Gacela as Guile modules: main loop in a thread

[gacela.git] / src / server.scm

diff --git a/src/server.scm b/src/server.scm
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+++ b/src/server.scm
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+;;; Gacela, a GNU Guile extension for fast games development
+;;; Copyright (C) 2009 by Javier Sancho Fernandez <jsf at jsancho dot org>
+;;;
+;;; This program 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.
+;;;
+;;; This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+(define-module (gacela server)
+  #:use-module (ice-9 optargs)
+  #:export (eval-from-client))
+
+
+(define start-server #f)
+(define check-connections #f)
+(define clean-closed-connections #f)
+(define eval-from-clients #f)
+(define stop-server #f)
+
+(let ((server-socket #f) (clients '())
+      (server-pipes #f))
+  (set! start-server
+       (lambda* (#:key (port #f) (pipes #f))
+         (cond (port
+                (set! server-socket (socket PF_INET SOCK_STREAM 0))
+                (setsockopt server-socket SOL_SOCKET SO_REUSEADDR 1)
+                (bind server-socket AF_INET INADDR_ANY port)
+                (listen server-socket 5))
+               (pipes
+                (set! server-pipes pipes)))
+         (cond ((not (game-running?))
+                (game-loop)))))
+
+
+  (set! clean-closed-connections
+       (lambda (conns)
+         (cond ((null? conns) '())
+               (else
+                (let* ((cli (car conns)) (sock (car cli)))
+                  (cond ((port-closed? sock)
+                         (clean-closed-connections (cdr conns)))
+                        (else
+                         (cons cli (clean-closed-connections (cdr conns))))))))))
+
+  (set! check-connections
+       (lambda ()
+         (set! clients (clean-closed-connections clients))
+         (catch #t
+                (lambda ()
+                  (cond ((char-ready? server-socket)
+                         (set! clients (cons (accept server-socket) clients)))))
+                (lambda (key . args) #f))))
+
+  (set! eval-from-clients
+       (lambda ()
+         (cond (server-pipes
+                (eval-from-client (car server-pipes) (cdr server-pipes))))
+         (for-each
+          (lambda (cli) (eval-from-client (car cli) (car cli)))
+          clients)))
+
+  (set! stop-server
+       (lambda ()
+         (cond (server-socket
+                (close server-socket)
+                (set! server-socket #f)))
+         (for-each (lambda (cli) (close (car cli))) clients)
+         (set! clients '()))))
+
+(define (eval-from-client rec-channel send-channel)
+  (cond ((char-ready? rec-channel)
+        (catch #t
+               (lambda ()
+                 (display "leido")(newline)
+                 (let ((exp (read rec-channel)))
+                   (cond ((eof-object? exp)
+                          (close rec-channel))
+                         (else
+                          (let ((result (eval-string exp)))
+                            (write (if (eq? result *unspecified*) "" (format #f "~a" result)) send-channel))))))
+               (lambda (key . args)
+                 (let ((fmt (string-concatenate (list (cadr args) "~%")))
+                       (params (caddr args)))
+                   (write
+                    (if params
+                        (apply format (cons #f (cons fmt params)))
+                        (format #f fmt))
+                    send-channel))))
+        (force-output send-channel))))
+
+
+(define (connect-to-server client-socket hostname port)
+  (connect client-socket AF_INET (car (hostent:addr-list (gethost hostname))) port))