From bb0e49db30c0aad4c1cc4f0b1df0e2e33a5a70af Mon Sep 17 00:00:00 2001
From: Ibrahim Mkusa <ibrahimmkusa@gmail.com>
Date: Wed, 29 Mar 2017 23:59:07 -0400
Subject: Added testdrive.md to describe experiments for feasibility and
 reorganized some files

---
 client.rkt                        | 72 ---------------------------------------
 client2.rkt                       | 43 -----------------------
 feasibility_analysis/client.rkt   | 72 +++++++++++++++++++++++++++++++++++++++
 feasibility_analysis/client2.rkt  | 43 +++++++++++++++++++++++
 feasibility_analysis/server.rkt   | 58 +++++++++++++++++++++++++++++++
 feasibility_analysis/tcptalk.rkt  | 30 ++++++++++++++++
 feasibility_analysis/testdrive.md | 20 +++++++++++
 server.rkt                        | 58 -------------------------------
 tcptalk.rkt                       | 30 ----------------
 9 files changed, 223 insertions(+), 203 deletions(-)
 delete mode 100644 client.rkt
 delete mode 100644 client2.rkt
 create mode 100644 feasibility_analysis/client.rkt
 create mode 100644 feasibility_analysis/client2.rkt
 create mode 100644 feasibility_analysis/server.rkt
 create mode 100644 feasibility_analysis/tcptalk.rkt
 create mode 100644 feasibility_analysis/testdrive.md
 delete mode 100644 server.rkt
 delete mode 100644 tcptalk.rkt

diff --git a/client.rkt b/client.rkt
deleted file mode 100644
index 967d2b9..0000000
--- a/client.rkt
+++ /dev/null
@@ -1,72 +0,0 @@
-#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/client2.rkt b/client2.rkt
deleted file mode 100644
index 47e3052..0000000
--- a/client2.rkt
+++ /dev/null
@@ -1,43 +0,0 @@
-#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/client.rkt b/feasibility_analysis/client.rkt
new file mode 100644
index 0000000..967d2b9
--- /dev/null
+++ b/feasibility_analysis/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/client2.rkt b/feasibility_analysis/client2.rkt
new file mode 100644
index 0000000..47e3052
--- /dev/null
+++ b/feasibility_analysis/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/server.rkt b/feasibility_analysis/server.rkt
new file mode 100644
index 0000000..bf72aff
--- /dev/null
+++ b/feasibility_analysis/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/tcptalk.rkt b/feasibility_analysis/tcptalk.rkt
new file mode 100644
index 0000000..d069851
--- /dev/null
+++ b/feasibility_analysis/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/testdrive.md b/feasibility_analysis/testdrive.md
new file mode 100644
index 0000000..b8e2883
--- /dev/null
+++ b/feasibility_analysis/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
+
+```
diff --git a/server.rkt b/server.rkt
deleted file mode 100644
index bf72aff..0000000
--- a/server.rkt
+++ /dev/null
@@ -1,58 +0,0 @@
-#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/tcptalk.rkt b/tcptalk.rkt
deleted file mode 100644
index d069851..0000000
--- a/tcptalk.rkt
+++ /dev/null
@@ -1,30 +0,0 @@
-#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
-- 
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