29 lines
1016 B
Racket
29 lines
1016 B
Racket
; SPDX-License-Identifier: LGPL-3.0-or-later
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; Copyright (C) 2010-2021 Tony Garnock-Jones <tonygarnockjones@gmail.com>
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#lang syndicate
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(require/activate "udp-dataspace.rkt")
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(require/activate syndicate/drivers/external-event)
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(require (only-in racket/port read-bytes-line-evt))
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(require racket/random file/sha1)
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(message-struct speak (who what))
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(assertion-struct present (who))
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(spawn (define me (bytes->hex-string (crypto-random-bytes 8)))
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(define stdin-evt (read-bytes-line-evt (current-input-port) 'any))
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(assert (mcds-outbound (present me)))
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(on (message (inbound (external-event stdin-evt (list $line))))
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(if (eof-object? line)
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(stop-current-facet)
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(send! (mcds-outbound (speak me line)))))
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(during (mcds-inbound (present $user))
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(on-start (printf "~a arrived\n" user))
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(on-stop (printf "~a left\n" user))
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(on (message (mcds-inbound (speak user $text)))
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(printf "~a says '~a'\n" user text))))
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