23 lines
854 B
Racket
23 lines
854 B
Racket
#lang syndicate
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;; A version of chat-simplified-internals2.rkt that has the simplified TCP
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;; driver split out into syndicate/drivers/tcp2.
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(require/activate syndicate/drivers/tcp2)
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(require racket/format)
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(message-struct speak (who what))
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(assertion-struct present (who))
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(spawn #:name 'chat-server
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(during/spawn (tcp-connection $id (tcp-listener 5999))
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(assert (tcp-accepted id))
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(let ((me (gensym 'user)))
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(assert (present me))
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(on (message (tcp-in-line id $bs))
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(send! (speak me (bytes->string/utf-8 bs)))))
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(during (present $user)
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(on-start (send! (tcp-out id (string->bytes/utf-8 (~a user " arrived\n")))))
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(on-stop (send! (tcp-out id (string->bytes/utf-8 (~a user " left\n")))))
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(on (message (speak user $text))
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(send! (tcp-out id (string->bytes/utf-8 (~a user " says '" text "'\n"))))))))
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