44 lines
1.5 KiB
Racket
44 lines
1.5 KiB
Racket
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#lang racket
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;; Both `server' and `accept-and-handle' change
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;; to use a custodian.
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;; To start server
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;; (define stop (client 8080))
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;; use your web browser to connect localhost:8080 greeted with "hello world"
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;; (stop) to close the server
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(define (client port-no)
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(define main-client-cust (make-custodian))
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(parameterize ([current-custodian main-client-cust])
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;; connect to server at port 8080
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(define-values (in out) (tcp-connect "localhost" port-no)) ;; define values
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;; binds to multiple values akin to unpacking tuples in python
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(thread (lambda ()
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(send-message in out)
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(close-input-port in)
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(close-output-port out))))
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(sleep 20)
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; (define (loop)
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; (write (read-line (current-input-port)) out)
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; (flush-output out)
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; (write (read-line in) (current-output-port))
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; (define listener (tcp-listen port-no 5 #t))
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; (define (loop)
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; (accept-and-handle listener)
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; (loop))
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; (thread loop)))
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(custodian-shutdown-all main-client-cust)
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#| (lambda () |#
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; (displayln "Goodbye, shutting down client\n")
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#| (custodian-shutdown-all main-client-cust)) |#)
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(define (send-message input-port output-port)
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(writeln "Doug: Hello, how's it going?" output-port)
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(flush-output output-port) ;; ports are buffered in racket must flush or you
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;; will read #eof
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(sleep 10) ;; wait 10 seconds
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(define serv-message (read-line input-port))
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(displayln serv-message) ;; read the servers replay message which is original
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;; with echo appended to it
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)
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