28 lines
1.0 KiB
Racket
28 lines
1.0 KiB
Racket
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#lang imperative-syndicate
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(require/activate imperative-syndicate/drivers/tcp)
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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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(message-struct stop-server ())
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(spawn #:name 'chat-server
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(stop-when (message (stop-server)))
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(during/spawn (tcp-connection $id (tcp-listener 5999))
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#:name (list 'chat-connection id)
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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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(match bs
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[#"/quit" (stop-current-facet)]
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[#"/stop-server" (send! (stop-server))]
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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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