palo/Scontrini-Daemon
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Now when you order pizzas it tells you the cost - I'm not happy with the

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implementation though, in needs to be more idiomatic and more efficient
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palo 2023-10-28 00:27:39 +02:00
parent 46c32a90bb
commit 4c14838f7e
1 changed files with 26 additions and 11 deletions
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37
scontrini.rkt
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@ -7,16 +7,16 @@
(define port 4444) (define port 4444)
(define hostname "127.0.0.1") (define hostname "127.0.0.1")
; Return a list of pizzas from the local file ; Return a list of all the pizzas from the local JSON file
(define (get-pizzas-list) (define (get-all-pizzas)
(let ((file (open-input-file "pizza_list.json"))) (let ((file (open-input-file "pizzas_list.json")))
(read-json file))) (read-json file)))
; Send the pizza list as a JSON, prepending it with 4 bytes that contain the list length ; Send the list of all pizzas as a JSON, prepending it with 4 bytes that contain the list length
(define (send-pizzas-list output) (define (send-pizzas-list output)
(let ((pizzas-list (get-pizzas-list))) (let ((all-pizzas-list (get-all-pizzas)))
(write-bytes (integer->integer-bytes (bytes-length (jsexpr->bytes pizzas-list)) 4 #f) output) (write-bytes (integer->integer-bytes (bytes-length (jsexpr->bytes all-pizzas-list)) 4 #f) output)
(write-json pizzas-list output))) (write-json all-pizzas-list output)))
; Print the to-print string on the printer ; Print the to-print string on the printer
; TODO add synchronization to avoid race conditions ; TODO add synchronization to avoid race conditions
@ -25,12 +25,27 @@
(display (string-replace to-print "\n" "\n\n") file) ; always add an extra newline because the printer is a little messed up (display (string-replace to-print "\n" "\n\n") file) ; always add an extra newline because the printer is a little messed up
(close-output-port file))) (close-output-port file)))
; Format the pizzas array from the JSON in a human-readable way ; Return the price of the pizza * its quantity, searching in all-pizzas-list
(define (format-pizza pizzas-list) (define (get-price-from-pizza pizza all-pizzas-list)
(let ((str "")) ; TODO rewrite in a more idiomatic way
(let ((found-price 0))
(for-each (lambda (pizza-hashmap) (for-each (lambda (pizza-hashmap)
(set! str (string-append str (format "~a : ~s\n" (hash-ref pizza-hashmap 'quantity) (hash-ref pizza-hashmap 'name))))) (if (equal? (hash-ref pizza 'name) (hash-ref pizza-hashmap 'name))
(set! found-price (hash-ref pizza-hashmap 'price))
#f))
all-pizzas-list)
(* found-price (hash-ref pizza 'quantity))))
; Format the pizzas list coming from the client in a human-readable way
(define (format-pizza pizzas-list)
(let ((str "")
(price 0)
(all-pizzas-list (hash-ref (get-pizzas-list) 'pizzas)))
(for-each (lambda (pizza-hashmap)
(set! str (string-append str (format "~a : ~s\n" (hash-ref pizza-hashmap 'quantity) (hash-ref pizza-hashmap 'name))))
(set! price (+ price (get-price-from-pizza pizza-hashmap all-pizzas-list))))
pizzas-list) pizzas-list)
(set! str (string-append str (format "Total price ~a" price)))
str)) str))
; Parse the commands given in the JSON ; Parse the commands given in the JSON