49 lines
1.6 KiB
Racket
49 lines
1.6 KiB
Racket
#lang racket/base
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(require racket/port)
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(require racket/match)
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(require "os2.rkt")
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(require "fake-tcp.rkt")
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(define (main)
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(ground-vm
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(transition 'none
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(spawn tcp-driver)
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(spawn (nested-vm 'chat-vm
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(transition 'no-state
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(at-meta-level
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(role/anon (tcp-listener 5999)
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#:topic t
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#:on-presence (spawn (connection-handler t))))))))))
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(define (connection-handler t)
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(match-define (topic _ (tcp-channel connection-id _ _) _) t)
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(define-values (cin cout in-topic out-topic) (tcp-accept t))
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(transition 'no-state
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(at-meta-level (cout (term->bytes `(you-are ,connection-id))))
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(at-meta-level (cin (tcp-mode 'lines)))
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(at-meta-level (cin (tcp-credit 1)))
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(at-meta-level (role/anon out-topic))
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(at-meta-level (role/anon in-topic
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#:on-absence (kill)
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[(tcp-channel _ _ (? bytes? line))
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(list (at-meta-level (cin (tcp-credit 1)))
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(send-message `(,connection-id says ,line)))]))
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(role/anon (topic-publisher `(,connection-id says ,(wild))))
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(role/anon (topic-subscriber `(,(wild) says ,(wild)))
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#:topic t
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#:on-presence (match t [(topic _ `(,who ,_ ,_) _)
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(when (not (equal? who connection-id))
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(at-meta-level (cout (term->bytes `(,who arrived)))))])
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#:on-absence (match t [(topic _ `(,who ,_ ,_) _)
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(when (not (equal? who connection-id))
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(at-meta-level (cout (term->bytes `(,who departed)))))])
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[message (at-meta-level (cout (term->bytes message)))])))
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(define (term->bytes v)
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(with-output-to-bytes (lambda () (write v) (newline))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(main)
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