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#lang racket
(require math/base) ;; for random number generation
;; author: Ibrahim Mkusa
;; about: print and read concurrently
;; notes: output may need to be aligned and formatted nicely
;; look into
;; https://docs.racket-lang.org/gui/text-field_.html#%28meth._%28%28%28lib._mred%2Fmain..rkt%29._text-field~25%29._get-editor%29%29
;; create custodian for managing all resources
;; so we can shutdown everything at once
;(define guard (make-custodian (current-custodian)))
;(current-custodian guard)
;; reads values continously from stdin and redisplays them
;; Notes connect to server on localhost
;; use client template of tcpvanilla
;; use event for read-write
;; modify read-loop-i
; read a value and send it to server via output-port
; is there something in the input port. If yes? display it
; in the hello world
; make connection to 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
(display in)
(displayln out)
;; binds to multiple values akin to unpacking tuples in python
(display "What's your name?\n")
(define username (read-line))
; (thread (lambda ()
;; make threads 2 lines
(define a (thread
(lambda ()
(let loop []
(receive-messages in)
(sleep 1)
(loop)))))
(define t (thread
(lambda ()
(let loop []
(send-messages username out)
(sleep 1)
(loop)))))
(thread-wait t) ;; returns prompt back to drracket
(close-input-port in)
(close-output-port out))
(custodian-shutdown-all main-client-cust))
;; the send-messages
(define (send-messages username out)
;; intelligent read, quits when user types in "quit"
;(semaphore-wait fair)
; (display usernamei)
(define input (read-line))
;; do something over here with input maybe send it out
;; Tests input if its a quit then kills all threads
;; An if would be better here tbh
;; (cond ((string=? input "quit") (begin (kill-thread a)
;(kill-thread t))))
(cond ((string=? input "quit") (exit)))
;; modify to send messages to out port
(displayln (string-append username ": " input) out)
(flush-output out)
;(semaphore-post fair)
; (read-loop-i out)
)
;; print hello world continously
;; "(hello-world)" can be executed as part of background thread
;; that prints in the event there is something in the input port
(define (receive-messages in)
; (sleep (random-integer 0 15)) ;; sleep between 0 and 15 seconds to simulate coms
;; with server
;(semaphore-wait fair)
;; we will retrieve the line printed below from the server
(define evt (sync/timeout 30 (read-line-evt in)))
(cond [(eof-object? evt)
(displayln "Server connection closed")
(exit)]
[(string? evt)
(displayln evt)] ; could time stamp here or to send message
[else
(displayln (string-append "Nothing received from server for 2 minutes."))]
)
;(semaphore-post fair)
)
(define stop (client 4321))
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