19 lines
563 B
Racket
19 lines
563 B
Racket
#lang racket/base
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;; Plain Racket version, using (require) instead of #lang marketplace.
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(require marketplace/sugar-untyped)
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(require marketplace/drivers/tcp-bare)
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(define (echoer from to)
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(transition/no-state
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(endpoint
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#:subscriber (tcp-channel from to ?)
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#:on-absence (quit)
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[(tcp-channel _ _ data)
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(send-message (tcp-channel to from data))])))
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(ground-vm tcp
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(endpoint #:subscriber (tcp-channel ? (tcp-listener 5999) ?)
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#:conversation (tcp-channel from to _)
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#:on-presence (spawn #:child (echoer from to))))
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