47 lines
1.5 KiB
Racket
47 lines
1.5 KiB
Racket
#lang racket/base
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;; A more different trivial example program demonstrating os2-tcp.rkt.
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(require racket/string)
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(require racket/set)
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(require racket/match)
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(require "os2.rkt")
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(require "os2-tcp.rkt")
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(define ((connection-handler local-addr remote-addr) self-pid)
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(transition 'no-state
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(send-tcp-mode remote-addr local-addr 'lines)
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(send-tcp-credit remote-addr local-addr 1)
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(role 'echoer (topic-subscriber (tcp-channel remote-addr local-addr (wild)))
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#:state state
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[(tcp-channel remote _ (? bytes? line))
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(transition state
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(send-tcp-credit remote-addr local-addr 1)
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(send-message
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(tcp-channel local-addr remote-addr (bytes-append #"You said: " line #"\n"))))]
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[(tcp-channel remote _ (? eof-object?))
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(transition state
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(kill))])))
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(define (listener local-addr)
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(transition 'no-state
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(role 'inbound-handler (topic-subscriber (tcp-channel (wild) local-addr (wild)) #:virtual? #t)
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#:state state
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#:topic t
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#:on-presence (match t
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[(topic 'publisher (tcp-channel remote-addr (== local-addr) _) #t)
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;; Ignore virtual flows. They just mean there's
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;; someone willing to supply connections to us
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;; at some point in the future.
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state]
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[(topic 'publisher (tcp-channel remote-addr (== local-addr) _) #f)
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(transition state (spawn (connection-handler local-addr remote-addr)))]))))
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(define (main port)
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(ground-vm
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(transition 'none
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(spawn tcp-spy)
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(spawn tcp-driver)
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(spawn (listener (tcp-listener port))))))
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(main 5999)
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