22 lines
755 B
Racket
22 lines
755 B
Racket
#lang syndicate
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(provide (struct-out tcp-channel-line))
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(require "tcp.rkt")
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(require "../support/bytes.rkt")
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(struct tcp-channel-line (source destination bytes) #:prefab)
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(spawn #:name 'line-reader-factory
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(during/spawn (observe (tcp-channel-line $src $dst _))
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#:name `(line-reader ,src ,dst)
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(field [buffer #""])
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(on (message (tcp-channel src dst $bs))
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(buffer (bytes-append (buffer) bs)))
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(begin/dataflow
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(define newline-pos (bytes-index (buffer) (char->integer #\newline)))
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(when newline-pos
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(define line (subbytes (buffer) 0 newline-pos))
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(buffer (subbytes (buffer) (+ newline-pos 1)))
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(send! (tcp-channel-line src dst line))))))
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