27 lines
1.1 KiB
Racket
27 lines
1.1 KiB
Racket
#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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(dataspace
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(spawn #:name 'chat-server
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(during/spawn (inbound (tcp-connection $id (tcp-listener 5999)))
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#:name (list 'chat-connection id)
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(assert (outbound (tcp-accepted id)))
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(let ((me (gensym 'user)))
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(assert (present me))
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(on (message (inbound (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" (quit-dataspace!)]
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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! (outbound (tcp-out id (string->bytes/utf-8 (~a user " arrived\n"))))))
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(on-stop (send! (outbound (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!
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(outbound (tcp-out id (string->bytes/utf-8 (~a user " says '" text "'\n"))))))))))
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