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