38 lines
1.4 KiB
Racket
38 lines
1.4 KiB
Racket
#lang prospect
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(require prospect/actor)
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(require prospect/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! (tcp-channel us them (string->bytes/utf-8 (apply format fmt vs)))
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#:meta-level 1))
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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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(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 (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 (advertise (tcp-channel us them _)) #:meta-level 1)
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(on (message (tcp-channel them us $bs) #:meta-level 1)
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(send! (says user (string-trim (bytes->string/utf-8 bs))))))))
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(spawn-tcp-driver)
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(network (define us (tcp-listener 5999))
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(forever (assert (advertise (observe (tcp-channel _ us _))) #:meta-level 1)
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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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