1 ;;; Mudsync --- Live hackable MUD
2 ;;; Copyright © 2016 Christopher Allan Webber <cwebber@dustycloud.org>
4 ;;; This file is part of Mudsync.
6 ;;; Mudsync is free software; you can redistribute it and/or modify it
7 ;;; under the terms of the GNU General Public License as published by
8 ;;; the Free Software Foundation; either version 3 of the License, or
9 ;;; (at your option) any later version.
11 ;;; Mudsync is distributed in the hope that it will be useful, but
12 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 ;;; General Public License for more details.
16 ;;; You should have received a copy of the GNU General Public License
17 ;;; along with Mudsync. If not, see <http://www.gnu.org/licenses/>.
19 (define-module (mudsync networking)
20 #:use-module (8sync actors)
21 #:use-module (8sync agenda)
22 #:use-module (ice-9 format)
23 #:use-module (ice-9 match)
24 #:use-module (ice-9 rdelim)
25 #:use-module (oop goops)
27 #:export (;; Should we be exporting these?
37 (define %default-server #f)
38 (define %default-port 8889)
40 (define-actor <network-manager> (<actor>)
42 (lambda* (actor message
43 #:key (server %default-server)
45 (nm-install-socket actor server port)))
47 (lambda* (actor message #:key client data)
48 (nm-send-to-client-id actor client data)))
49 (new-client nm-new-client))
51 (server-socket #:getter nm-server-socket)
52 ;; mapping of client -> client-id
53 (clients #:getter nm-clients
54 #:init-thunk make-hash-table)
55 ;; send input to this actor
56 (send-input-to #:getter nm-send-input-to
57 #:init-keyword #:send-input-to))
59 ;;; TODO: We should provide something like this, but this isn't used currently,
60 ;;; and uses old deprecated code (the 8sync-port-remove stuff).
61 ;; (define-method (nm-close-everything (nm <network-manager>) remove-from-agenda)
63 ;; ;; close all clients
67 ;; (if remove-from-agenda
68 ;; (8sync-port-remove client)))
70 ;; ;; reset the clients list
71 ;; (set! (nm-clients) (make-hash-table))
72 ;; ;; close the server
73 ;; (close (nm-server-socket nm))
74 ;; (if remove-from-agenda
75 ;; (8sync-port-remove (nm-server-socket nm))))
77 ;; Maximum number of backlogged connections when we listen
78 (define %maximum-backlog-conns 128) ; same as SOMAXCONN on Linux 2.X,
81 (define (nm-install-socket nm server port)
82 "Install socket on SERVER with PORT"
84 (socket PF_INET ; ipv4
85 SOCK_STREAM ; two-way connection-based byte stream
89 (inet-pton AF_INET server)
92 ;; Totally mimed from the Guile manual. Not sure if we need this, but:
93 ;; http://www.unixguide.net/network/socketfaq/4.5.shtml
94 (setsockopt s SOL_SOCKET SO_REUSEADDR 1) ; reuse port even if port is busy
95 ;; Connecting to a non-specific address:
96 ;; (bind s AF_INET INADDR_ANY port)
97 ;; Should this be an option? Guess I don't know why we'd need it
98 ;; @@: If we wanted to support listening on a particular hostname,
99 ;; could see 8sync's irc.scm...
100 (bind s AF_INET addr port)
101 ;; Listen to connections
102 (listen s %maximum-backlog-conns)
104 ;; Make port non-blocking
105 (fcntl s F_SETFL (logior O_NONBLOCK (fcntl s F_GETFL)))
107 ;; @@: This is used in Guile's http server under the commit:
108 ;; * module/web/server/http.scm (http-open): Ignore SIGPIPE. Keeps the
109 ;; server from dying in some circumstances.
110 ;; (sigaction SIGPIPE SIG_IGN)
111 ;; Will this break other things that use pipes for us though?
113 (slot-set! nm 'server-socket s)
115 (format #t "Listening for clients in pid: ~s\n" (getpid))
117 ;; TODO: set up periodic close of idle connections?
119 ;; (yield) ;; @@: Do we need this?
120 (define client-connection (accept s))
121 (<- (actor-id nm) 'new-client
125 (define (nm-new-client nm message s client-connection)
126 "Handle new client coming in to socket S"
127 (define client-details (cdr client-connection))
128 (define client (car client-connection))
129 (define client-id (big-random-number))
130 (format #t "New client: ~s\n" client-details)
131 (format #t "Client address: ~s\n"
133 (sockaddr:addr client-details)))
134 (fcntl client F_SETFL (logior O_NONBLOCK (fcntl client F_GETFL)))
135 (hash-set! (nm-clients nm) client-id client)
136 (<- (nm-send-input-to nm) 'new-client #:client client-id)
137 (nm-client-receive-loop nm client client-id))
139 (define (nm-client-receive-loop nm client client-id)
140 "Make a method to receive client data"
142 (define line (read-line client))
143 (if (eof-object? line)
144 (nm-handle-port-eof nm client client-id)
146 (nm-handle-line nm client client-id
147 (string-trim-right line #\return))
148 (when (actor-alive? nm)
152 (define (nm-handle-port-closed nm client client-id)
153 "Handle a closed port"
154 (format #t "DEBUG: handled closed port ~x\n" client-id)
155 (hash-remove! (nm-clients nm) client-id)
156 (<-* `(#:actor ,nm) (nm-send-input-to nm) 'client-closed #:client client-id))
158 (define-method (nm-handle-port-eof nm client client-id)
159 "Handle seeing an EOF on port"
160 (format #t "DEBUG: handled eof-object on port ~x\n" client-id)
162 (hash-remove! (nm-clients nm) client-id)
163 (<-* `(#:actor ,nm) (nm-send-input-to nm) 'client-closed
166 (define-method (nm-handle-line nm client client-id line)
167 "Handle an incoming line of input from a client"
168 (<-* `(#:actor ,nm) (nm-send-input-to nm) 'client-input
172 (define-method (nm-send-to-client-id nm client-id data)
173 "Send DATA to TO-CLIENT id"
174 (define client-obj (hash-ref (nm-clients nm) client-id))
176 (throw 'no-such-client
177 "Asked to send data to client but that client doesn't exist"
178 #:client-id client-id
180 (display data client-obj))