Merge pull request #1 from oplS17projects/mango

Mango

Hermes/client.rkt

@@ -0,0 +1,102 @@
+#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))
+

Hermes/concurrentreadandprint.rkt

@@ -0,0 +1,75 @@
+#lang racket
+(require math/base) ;; for random number generation
+
+;; a proof of concept
+;; one thread waits for input
+;; another displays messages in the background
+
+
+;; 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
+(define (read-loop)
+  (display (read-line))
+  (display "\n")
+  (read-loop)
+  )
+
+(define input-prompt "input: ")
+(define output-prompt "output: ")
+
+;; prompt for username and bind to a variable username
+(display "What's your name?\n")
+(define username (read-line))
+(define usernamei (string-append username ": ")) ;; make username appear nicer in a prompt
+(define fair (make-semaphore 1))
+
+;; intelligent read, quits when user types in "quit"
+(define (read-loop-i)
+  
+  
+  ;(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))))
+  (display (string-append output-prompt input "\n"))
+  ;(semaphore-post fair)
+  (read-loop-i)
+  )
+
+
+;; 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 (hello-world)
+  (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
+  ;; at this time we simulate the input from different users
+  (define what-to-print (random-integer 0 2))
+  (if (= what-to-print 0)
+      (display "Doug: What's up, up?\n")
+      (display "Fred: Looking good, good!\n"))
+  ;(semaphore-post fair)
+  (hello-world))
+
+(define t (thread (lambda ()
+                    (read-loop-i))))
+(define a (thread (lambda ()
+                    (hello-world))))
+
+(thread-wait t) ;; returns prompt back to drracket
+;; below doesn't execute
+; (sleep 10)
+; (kill-thread t)
+; (define a (thread (display "hello world!\n")))
+; (display "John: hello soso\n")
+; (display "Emmanuel: cumbaya!!!!\n")

Hermes/server.rkt

@@ -0,0 +1,140 @@
+#lang racket
+(require math/base) ;; for random number generation
+
+;; globals
+;; must control access via semaphore as listener thread or broadcast thread
+;; might need to access it
+(define connections '())  ;; maintains a list of open ports
+;; ((in1, out1), (in2, out2), (in3, out3), (in4, out4) ...)
+(define connections-s (make-semaphore 1)) ;; control access to connections
+
+;; every 5 seconds run to broadcast top message in list
+;; and remove it from list
+(define messages-s (make-semaphore 1))  ;; control access to messages
+(define messages '("hello, world!"))  ;; stores a list of messages(strings) from currents
+
+(define threads-s (make-semaphore 1))  ;; control access to threads
+;; lets keep thread descriptor values
+(define threads '())  ;; stores a list of client serving threads as thread descriptor values
+
+
+
+;;
+
+;; This is a relay server making two clients communicate
+;; Both `server' and `accept-and-handle' change
+;; to use a custodian.
+;; To start server
+;; (define stop (serve 8080))
+;; (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)
+    ;; Create a thread whose job is to simply call broadcast iteratively
+    (thread (lambda ()
+              (let loopb []
+                (sleep 30)  ;; wait 30 secs before beginning to broadcast
+                (broadcast)
+                (sleep 10) ;; sleep for 10 seconds between broadcasts
+                (loopb)))))
+  (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))
+    ; discard request header
+    ; Discard the request header (up to blank line):
+    (regexp-match #rx"(\r\n|^)\r\n" in)
+    (semaphore-wait connections-s)
+    ;; keep track of open ports
+    (set! connections (append connections (list (list in out))))
+    (semaphore-post connections-s)
+
+    ; start a thread to deal with specific client and add descriptor value to the list of threads
+    (set! threads (append threads (list (thread (lambda ()
+              (handle in out) ;; this handles connection with that specific client
+              (close-input-port in)
+              (close-output-port out))))
+            )
+    ) 
+  ;; Watcher thread:
+  ;; kills current thread for waiting too long for connection from
+  ;; clients
+  (thread (lambda ()
+            (sleep 360)
+            (custodian-shutdown-all cust)))))
+
+; (define (handle connections)
+;   ())
+;; each thread needs 2 new threads
+(define (handle in out) 
+  ; define function to deal with incoming messages from client
+  (define (something-to-say in)
+    (define evt-t0 (sync/timeout 30  (read-line-evt in 'linefeed)))
+    (cond [(eof-object? evt-t0)
+           (displayln (string-append "Connection closed " (current-thread) "exiting"))
+           (exit)
+           ]
+          [(string? evt-t0)
+           (semaphore-wait messages-s)
+           ; append the message to list of messages
+           (display (string-append evt-t0 "\n"))
+           (set! messages (append messages (list evt-t0)))
+           (semaphore-post messages-s)]
+          [else
+           (displayln (string-append "Nothing received from " (current-thread)))]))
+
+
+  ; define function to deal with out
+  (define (something-to-send out)
+    (define evt-t1 (sync/timeout 120 (thread-receive-evt)))
+    ;; send message to client
+    (fprintf out "~a~n" (thread-receive))
+    (flush-output out)
+    )
+  ; thread them each
+
+  ;; i could bind to values, and call wait on them
+  ;; thread that deals with incoming messages for that particular thread
+  (thread (lambda ()
+            (let loop []
+              (something-to-say in)
+              (sleep 1)
+              (loop))))
+
+  (thread (lambda ()
+            (let loop []
+              (something-to-send out)
+              (sleep 1)
+              (loop))))
+  ; (server-loop in out)
+  ; (sleep 5) ;; wait 5 seconds to guarantee client has already send message
+  'ok
+ )
+
+;; define a broadcast function
+(define broadcast
+  (lambda ()
+    (semaphore-wait messages-s)
+    (semaphore-wait threads-s)
+    (if (not (null? messages))
+        (begin (map (lambda (thread-descriptor)
+            (thread-send thread-descriptor (first messages)))
+                    threads)
+               (set! messages (rest messages))
+        )
+      (display "No message to display\n") ; for later create file port for errors and save error messages to that file
+      )
+    (semaphore-post threads-s)
+    (semaphore-post messages-s)))
+
+(define stop (serve 4321)) ;; start server then close with stop

Hermes/tcpcommunication.rkt

@@ -0,0 +1,60 @@
+#lang racket
+;; Reads input iteratively then sends it to local server
+;; client reads back the message and displays it
+
+(require math/base) ;; for random number generation
+
+(define listener (tcp-listen 4326 5 #t))
+(define a (thread (lambda ()
+          (define-values (s-in s-out) (tcp-accept listener))
+          ; Discard the request header (up to blank line):
+          ;(regexp-match #rx"(\r\n|^)\r\n" s-in)
+          (sleep 10) 
+          (define (echo)
+            (define input (read-line s-in))
+            (displayln input s-out)
+            (flush-output s-out)
+            (if (eof-object? input)
+                (displayln "Done talking\n")
+                (echo)))
+          (echo)
+          (close-input-port s-in)
+          (close-output-port s-out)
+          (tcp-close listener)
+          'ok)))
+
+(define t (thread (lambda ()
+          (define-values (c-in c-out) (tcp-connect "localhost" 4326))
+          (define input-prompt "input: ")
+          (define output-prompt "output: ")
+
+          ;; prompt for username and bind to a variable username
+          (display "What's your name?\n")
+          (define username (read-line))
+          (define usernamei (string-append username ": ")) ;; make username appear nicer in a prompt
+          (define fair (make-semaphore 1))
+
+          ;; intelligent read, quits when user types in "quit"
+          (define (read-loop-i)
+            ;(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") (exit)))
+            (display (string-append output-prompt input "\n") c-out)
+            (flush-output c-out)
+            (displayln (read-line c-in)) ;; server echoes back sent input
+            ;(semaphore-post fair)
+            (read-loop-i)
+          )
+          (read-loop-i)
+          'ok)))
+  
+;(kill-thread a)
+;(kill-thread t)
+(thread-wait t)
+(display "DONE!!\n")
+

Makefile

@@ -0,0 +1,3 @@
+# Remove idiotic save files
+clean:
+	rm -rf *~

README.md

@@ -72,11 +72,11 @@ satisfactorily we would have met our goals.
 ## Architecture Diagram
 
 #### Preliminary design
-![Architecture](https://github.com/oplS17projects/Hermes/blob/master/arch_diagram.png)
+![Architecture](https://github.com/oplS17projects/Hermes/blob/master/ext/arch_diagram.png)
 
 
 #### The Game plan
-![Diagram](https://github.com/oplS17projects/Hermes/blob/master/architecture_diagram.png)
+![Diagram](https://github.com/oplS17projects/Hermes/blob/master/ext/architecture_diagram.png)
 
 
 ## Schedule

tests/tcpevents/crpovertcp.rkt

@@ -0,0 +1,155 @@
+#lang racket
+(require math/base) ;; for random number generation
+
+;; globals
+;; must control access via semaphore as listener thread or broadcast thread
+;; might need to access it
+(define connections '())  ;; maintains a list of open ports
+;; ((in1, out1), (in2, out2), (in3, out3), (in4, out4) ...)
+
+;; lets keep thread descriptor values
+;
+
+(define fair (make-semaphore 1)) ;; managing connections above
+
+(define can-i-broadcast (make-semaphore 1))
+
+
+;;
+
+;; This is a relay server making two clients communicate
+;; Both `server' and `accept-and-handle' change
+;; to use a custodian.
+;; To start server
+;; (define stop (serve 8080))
+;; (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))
+    (semaphore-wait fair)
+    ;; keep track of open ports
+    (append connections (list (list in out)))
+    (semaphore-wait fiar)
+
+    ; thread will communicate to all clients at once in a broadcast
+    ; manner
+    (thread (lambda ()
+              (handle in out) ;; this handles connection with that specific client
+              (close-input-port in)
+              (close-output-port out)))
+    )
+  ;; Watcher thread:
+  ;; kills current thread for waiting too long for connection from
+  ;; clients
+  (thread (lambda ()
+            (sleep 120)
+            (custodian-shutdown-all cust))))
+
+; (define (handle connections)
+;   ())
+;; each thread needs 2 new threads
+(define (handle in out) 
+  ; define function to deal with in
+  (define (something-to-say in)
+    (sync/timeout 4 (read-line-evt in 'linefeed)))
+  ; define function to deal with out
+  ; thread them each
+  ; (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)
+)
+;; This is a single server communicating directly to the client
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+
+;; 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
+(define (read-loop)
+  (display (read-line))
+  (display "\n")
+  (read-loop)
+  )
+
+(define input-prompt "input: ")
+(define output-prompt "output: ")
+
+;; prompt for username and bind to a variable username
+(display "What's your name?\n")
+(define username (read-line))
+(define usernamei (string-append username ": ")) ;; make username appear nicer in a prompt
+
+;; intelligent read, quits when user types in "quit"
+(define (read-loop-i)
+  
+  
+  ;(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))))
+  (display (string-append output-prompt input "\n"))
+  ;(semaphore-post fair)
+  (read-loop-i)
+  )
+
+
+;; 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 (hello-world)
+  (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
+  ;; at this time we simulate the input from different users
+  (define what-to-print (random-integer 0 2))
+  (if (= what-to-print 0)
+      (display "Doug: What's up, up?\n")
+      (display "Fred: Looking good, good!\n"))
+  ;(semaphore-post fair)
+  (hello-world))
+
+(define t (thread (lambda ()
+                    (read-loop-i))))
+(define a (thread (lambda ()
+                    (hello-world))))
+
+(thread-wait t) ;; returns prompt back to drracket
+;; below doesn't execute
+; (sleep 10)
+; (kill-thread t)
+; (define a (thread (display "hello world!\n")))
+; (display "John: hello soso\n")
+; (display "Emmanuel: cumbaya!!!!\n")