15 lines
421 B
Racket
15 lines
421 B
Racket
#lang marketplace
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(observe-publishers (tcp-channel ? (tcp-listener 5999) ?)
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(match-conversation (tcp-channel from to _)
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(on-presence (spawn (echoer from to)))))
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(define (echoer from to)
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(transition stateless
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(publisher (tcp-channel to from ?))
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(subscriber (tcp-channel from to ?)
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(on-absence (quit))
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(on-message
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[(tcp-channel _ _ data)
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(send-message (tcp-channel to from data))]))))
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