32 lines
1.4 KiB
Racket
32 lines
1.4 KiB
Racket
#lang syndicate ;; -*- racket -*-
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(require (only-in racket/string string-trim))
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(require "../drivers/tcp.rkt")
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(require "../demand-matcher.rkt")
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(define (spawn-session them us)
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(define user (gensym 'user))
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(define (send-to-remote fmt . vs)
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(send! (at-meta (tcp-channel us them (string->bytes/utf-8 (apply format fmt vs))))))
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(define (say who fmt . vs)
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(unless (equal? who user) (send-to-remote "~a ~a\n" who (apply format fmt vs))))
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(actor (send-to-remote "Welcome, ~a.\n" user)
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(until (retracted (advertise (tcp-channel them us ?)) #:meta-level 1)
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(assert (advertise (tcp-channel us them ?) #:meta-level 1))
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(assert (advertise `(,user says ,?)))
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(on (asserted (advertise `(,$who says ,?))) (say who "arrived."))
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(on (retracted (advertise `(,$who says ,?))) (say who "departed."))
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(on `(,$who says ,$what) (say who "says: ~a" what))
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(on (message (at-meta (tcp-channel them us $bs)))
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(define input-string (string-trim (bytes->string/utf-8 bs)))
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(if (equal? input-string "quit-dataspace")
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(assert! 'quit-dataspace)
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(send! `(,user says ,input-string)))))
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(send-to-remote "Goodbye!\n")))
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(spawn-tcp-driver)
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(let ((us (tcp-listener 5999)))
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(group (until (asserted 'quit-dataspace)
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(on (asserted (advertise (tcp-channel $them us ?)) #:meta-level 1)
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(spawn-session them us)))))
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