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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))
+