1 files changed, 58 insertions, 0 deletions
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))
+