53 lines
2.0 KiB
Racket
53 lines
2.0 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 tcp-remote-open (id) #:prefab)
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(struct tcp-local-open (id) #:prefab)
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(struct tcp-incoming-data (id bytes) #:prefab)
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(struct tcp-outgoing-data (id bytes) #:prefab)
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(struct says (who what) #:prefab)
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(struct present (who) #:prefab)
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(define (spawn-session id)
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(actor (define (send-to-remote fmt . vs)
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(send! (tcp-outgoing-data id (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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(send-to-remote "Welcome, ~a.\n" user)
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(until (retracted (tcp-remote-open id))
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(assert (tcp-local-open id))
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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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(on (message (tcp-incoming-data id $bs))
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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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(define us (tcp-listener 5999))
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(actor (forever (assert (advertise (observe (tcp-channel _ us _))))
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(on (asserted (advertise (tcp-channel $them us _)))
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(define id (seal (list them us)))
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(actor (state [(assert (tcp-remote-open id))
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(on (message (tcp-channel them us $bs))
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(send! (tcp-incoming-data id bs)))
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(on (message (tcp-outgoing-data id $bs))
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(send! (tcp-channel us them bs)))]
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[(retracted (advertise (tcp-channel them us _))) (void)]
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[(retracted (tcp-local-open id)) (void)])))))
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(forever (on (asserted (tcp-remote-open $id))
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(spawn-session id)))
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