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-rw-r--r--feasibility_analysis/gui/windows.rkt9
-rw-r--r--feasibility_analysis/tcpevents/README.md1
-rw-r--r--feasibility_analysis/tcpevents/server.rkt39
-rw-r--r--feasibility_analysis/tcpvanilla/client.rkt72
-rw-r--r--feasibility_analysis/tcpvanilla/client2.rkt43
-rw-r--r--feasibility_analysis/tcpvanilla/server.rkt58
-rw-r--r--feasibility_analysis/tcpvanilla/tcptalk.rkt30
-rw-r--r--feasibility_analysis/tcpvanilla/testdrive.md20
8 files changed, 272 insertions, 0 deletions
diff --git a/feasibility_analysis/gui/windows.rkt b/feasibility_analysis/gui/windows.rkt
new file mode 100644
index 0000000..4524673
--- /dev/null
+++ b/feasibility_analysis/gui/windows.rkt
@@ -0,0 +1,9 @@
+#lang racket
+
+(require racket/gui/base)
+
+;; Create a new window via the frame class
+(define frame (new frame% [label "Example"]))
+
+;; Show frame(window) by calling it show method
+(send frame show #t) ;; you call object methods via send
diff --git a/feasibility_analysis/tcpevents/README.md b/feasibility_analysis/tcpevents/README.md
new file mode 100644
index 0000000..7c3ec21
--- /dev/null
+++ b/feasibility_analysis/tcpevents/README.md
@@ -0,0 +1 @@
+TCP communication racket concepts of events. For more see the racket guide.
diff --git a/feasibility_analysis/tcpevents/server.rkt b/feasibility_analysis/tcpevents/server.rkt
new file mode 100644
index 0000000..4313bda
--- /dev/null
+++ b/feasibility_analysis/tcpevents/server.rkt
@@ -0,0 +1,39 @@
+#lang racket
+
+(define (serve in-port out-port)
+ (let loop []
+ (define evt (sync/timeout 2
+ (read-line-evt in-port 'any)
+ (thread-receive-evt)))
+ (cond
+ [(not evt)
+ (displayln "Timed out, exiting")
+ (tcp-abandon-port in-port)
+ (tcp-abandon-port out-port)]
+ [(string? evt)
+ (fprintf out-port "~a~n" evt)
+ (flush-output out-port)
+ (loop)]
+ [else
+ (printf "Received a message in mailbox: ~a~n"
+ (thread-receive))
+ (loop)])))
+
+(define port-num 4321)
+(define (start-server)
+ (define listener (tcp-listen port-num))
+ (thread
+ (lambda ()
+ (define-values [in-port out-port] (tcp-accept listener))
+ (serve in-port out-port))))
+
+(start-server)
+
+(define client-thread
+ (thread
+ (lambda ()
+ (define-values [in-port out-port] (tcp-connect "localhost" port-num))
+ (display "first\nsecond\nthird\n" out-port)
+ (flush-output out-port)
+ ; copy-port will block until EOF is read from in-port
+ (copy-port in-port (current-output-port)))))
diff --git a/feasibility_analysis/tcpvanilla/client.rkt b/feasibility_analysis/tcpvanilla/client.rkt
new file mode 100644
index 0000000..967d2b9
--- /dev/null
+++ b/feasibility_analysis/tcpvanilla/client.rkt
@@ -0,0 +1,72 @@
+#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 ()
+ (chat in out)
+ (close-input-port in)
+ (close-output-port out))
+ (custodian-shutdown-all main-client-cust))
+
+ ; (sleep 60) ;; run for 3 minutes then close
+ ; (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 (chat in out)
+ ; (driver-loop in out)
+ (writeln "Ibrahim: Hello, anyone in chat?" out)
+ (flush-output out) ;; ports are buffered in racket must flush or you
+ ;; will read #eof
+ (sleep 10) ;; wait 10 seconds
+ (define serv-message (read-line in))
+ (displayln serv-message) ;; read the servers replay message which is original
+ ;; with echo appended to it
+ )
+
+; (define input-prompt "Hermes: ")
+
+(define (driver-loop in out)
+ ; (prompt-for-input input-prompt)
+ (display ">>> ")
+ (define input (read))
+ (writeln (string-append "Ibrahim: " input) out)
+ (flush-output out)
+ ; (sleep 10)
+ (define output (read-line in))
+ (displayln output)
+ (driver-loop in out))
+
+
+#| (let ((input (read))) |#
+; )
+; (let ((input (read)))
+; (let ((output (mc-eval input the-global-environment)))
+; (announce-output output-prompt)
+; (user-print output)))
+; (driver-loop))
+;
+; (define (announce-output string)
+; (display string))
+#| |#
diff --git a/feasibility_analysis/tcpvanilla/client2.rkt b/feasibility_analysis/tcpvanilla/client2.rkt
new file mode 100644
index 0000000..47e3052
--- /dev/null
+++ b/feasibility_analysis/tcpvanilla/client2.rkt
@@ -0,0 +1,43 @@
+#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
+ )
diff --git a/feasibility_analysis/tcpvanilla/server.rkt b/feasibility_analysis/tcpvanilla/server.rkt
new file mode 100644
index 0000000..bf72aff
--- /dev/null
+++ b/feasibility_analysis/tcpvanilla/server.rkt
@@ -0,0 +1,58 @@
+#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))
+
diff --git a/feasibility_analysis/tcpvanilla/tcptalk.rkt b/feasibility_analysis/tcpvanilla/tcptalk.rkt
new file mode 100644
index 0000000..d069851
--- /dev/null
+++ b/feasibility_analysis/tcpvanilla/tcptalk.rkt
@@ -0,0 +1,30 @@
+#lang racket
+
+(define listener (tcp-listen 8083 5 #t)) ;; listener to service connection requests
+;; client attempts to connect. Receives an input and output port
+(define-values (client-in client-out) (tcp-connect "localhost" 8083))
+;; server accepts the connection request. Also gets a pair of ports
+(define-values (server-in server-out) (tcp-accept listener))
+
+;; client sends identifying message
+(display (string-append "Client:My name is " "Ibrahim" "\n")
+ client-out)
+(flush-output client-out) ;; must flush as ports are buffered in racket
+
+;; server receives and reads it
+;; cooler if on separate racket instances
+(read-line server-in) ;; --> "Client:My name is #hostname.
+;; server replies
+(display (string-append "Server:Hi " "Ibrahim" "\n") server-out)
+(flush-output server-out) ;; flush flush
+
+;; client displays server message
+(read-line client-in)
+(close-output-port server-out)
+(close-output-port client-out)
+(read-line client-in) ;; --> eof object #eof
+(read-line server-in) ;; --> eof object #eof
+(tcp-close listener)
+; (custodian-shutdown-all (current-custodian)) ;; release all resources including
+ ;; tcp, file, custom ports
+ ;; application exits
diff --git a/feasibility_analysis/tcpvanilla/testdrive.md b/feasibility_analysis/tcpvanilla/testdrive.md
new file mode 100644
index 0000000..b8e2883
--- /dev/null
+++ b/feasibility_analysis/tcpvanilla/testdrive.md
@@ -0,0 +1,20 @@
+a simple experiment on communication via tcp ports
+
+a server runs continously servicing clients. Clients connect, send a message, and
+server replies with a message. Message should appear in each separate REPL area
+prompt
+
+run server.rkt in a REPL
+```
+,en server.rkt
+(define stop (serve 8080)) ;; starts serve listening at port 8080
+(stop) ;; to stop server and free the ports
+
+```
+
+run client.rkt in a separate REPL
+```
+,en client.rkt
+(define stop (client 8080)) ;; starts client talking to server at port 8080
+
+```