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#lang racket
;; Both `server' and `accept-and-handle' change
;; to use a custodian.
;; To start server
;; (define stop (serve 8080))
;; use your web browser to connect localhost:8080 greeted with "hello world"
;; (stop) to close the server
(define (serve port-no)
(define main-cust (make-custodian))
(parameterize ([current-custodian main-cust])
(define listener (tcp-listen port-no 5 #t))
(define (loop)
(accept-and-handle listener)
(loop))
(thread loop))
(lambda ()
(displayln "\nGoodbye, shutting down all services\n")
(custodian-shutdown-all main-cust)))
(define (accept-and-handle listener)
(define cust (make-custodian))
(parameterize ([current-custodian cust])
(define-values (in out) (tcp-accept listener))
(thread (lambda ()
(handle in out) ;; this handles connection with that specific client
(close-input-port in)
(close-output-port out))))
;; Watcher thread:
(thread (lambda ()
(sleep 120)
(custodian-shutdown-all cust))))
(define (handle in out)
; (server-loop in out)
(sleep 5) ;; wait 5 seconds to guarantee client has already send message
(define echo (read-line in)) ;; bind message to echo
(displayln (string-append echo "\n"))
; echo back the message, appending echo
; could regex match the input to extract the name
(writeln "Admin: Hello there" out) ;; append "echo " to echo and send back
(flush-output out)
)
(define input-prompt "Hermes: ")
(define (server-loop in out)
(define echo (read-line in))
(displayln echo)
(display ">>> ")
(define input (read))
(writeln (string-append "Admin: " input) out)
(flush-output out)
; (sleep 10)
(server-loop in out))
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