syndicate-rkt/syndicate-examples/chat-server.rkt

34 lines
1.3 KiB
Racket

; SPDX-License-Identifier: LGPL-3.0-or-later
; Copyright (C) 2010-2021 Tony Garnock-Jones <tonygarnockjones@gmail.com>
#lang syndicate
(require/activate syndicate/drivers/tcp)
(require racket/format)
(message-struct speak (who what))
(assertion-struct present (who))
(message-struct stop-server ())
(spawn #:name 'chat-server
(stop-when (message (stop-server)))
(during/spawn (tcp-connection $id (tcp-listener 5999))
#:name (list 'chat-connection id)
(assert (tcp-accepted id))
(on-start (issue-credit! (tcp-listener 5999))
(issue-credit! tcp-in id))
(let ((me (gensym 'user)))
(assert (present me))
(on (message (tcp-in-line id $bs))
(issue-credit! tcp-in id)
(match bs
[#"/quit" (stop-current-facet)]
[#"/stop-server" (send! (stop-server))]
[_ (send! (speak me (bytes->string/utf-8 bs)))])))
(during (present $user)
(on-start (send! (tcp-out id (string->bytes/utf-8 (~a user " arrived\n")))))
(on-stop (send! (tcp-out id (string->bytes/utf-8 (~a user " left\n")))))
(on (message (speak user $text))
(send! (tcp-out id (string->bytes/utf-8 (~a user " says '" text "'\n"))))))))