37 lines
1.4 KiB
Racket
37 lines
1.4 KiB
Racket
#lang syndicate/actor
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(require syndicate/protocol/advertise)
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(require/activate syndicate/drivers/tcp)
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(require (only-in racket/string string-trim))
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(struct says (who what) #:prefab)
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(struct present (who) #:prefab)
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(define (spawn-session them us)
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(actor (define (send-to-remote fmt . vs)
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(send! (outbound (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)
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(send-to-remote "~a ~a\n" who (apply format fmt vs))))
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(define user (gensym 'user))
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(on-start (send-to-remote "Welcome, ~a.\n" user))
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(stop-when (retracted (inbound (advertise (tcp-channel them us _)))))
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(assert (present user))
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(on (asserted (present $who)) (say who "arrived."))
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(on (retracted (present $who)) (say who "departed."))
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(on (message (says $who $what)) (say who "says: ~a" what))
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(assert (outbound (advertise (tcp-channel us them _))))
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(on (message (inbound (tcp-channel them us $bs)))
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(send! (says user (string-trim (bytes->string/utf-8 bs)))))))
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(dataspace (define us (tcp-listener 5999))
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(forever (assert (outbound (advertise (observe (tcp-channel _ us _)))))
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(on (asserted (inbound (advertise (tcp-channel $them us _))))
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(spawn-session them us))))
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