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Added communication with the Scontrini-Daemon API

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This commit is contained in:
palo 2023-11-07 23:14:03 +01:00
parent 676a00d733
commit 1428abb88c
4 changed files with 378 additions and 34 deletions
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76
api/api.go Normal file
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@ -0,0 +1,76 @@
package api
import (
"fmt"
"net"
)
type Pizza struct {
Name string `json:"name"`
Price int `json:"price"`
Quantity int `json:"quantity"`
}
/**
* Send and Receive messages from the API
*/
func SendPrintCommand(socket *net.TCPConn, text string) (*net.TCPConn, error) {
json_command := PrintCommand{Command: "print", Text: text}
socket, err := sendJSONToServer(socket, json_command)
if err != nil {
fmt.Println("Error while connecting to the printer server")
return nil, err
}
return socket, nil
}
func SendPizzaCommand(socket *net.TCPConn, pizzas []Pizza) (*net.TCPConn, error) {
json_command := PizzaCommand{Command: "pizza", Pizzas: pizzas}
socket, err := sendJSONToServer(nil, json_command)
if err != nil {
fmt.Println("Error while connecting to the printer server")
return nil, err
}
return socket, nil
}
func SendGetPizzasCommand(socket *net.TCPConn) (*net.TCPConn, error) {
json_command := GetPizzasCommand{Command: "get-pizzas"}
socket, err := sendJSONToServer(nil, json_command)
if err != nil {
fmt.Println("Error while connecting to the printer server")
return nil, err
}
return socket, nil
}
func ReceivePizzasCommand(socket *net.TCPConn) (*net.TCPConn, ReceivePizzas, error) {
pizzas := ReceivePizzas{}
socket, err := receiveJSONFromServer(socket, &pizzas)
if err != nil {
fmt.Println("Error while connecting to the printer server")
return nil, pizzas, err
}
return socket, pizzas, nil
}
func ReceivePriceCommand(socket *net.TCPConn) (*net.TCPConn, ReceivePrice, error) {
price := ReceivePrice{}
socket, err := receiveJSONFromServer(socket, &price)
if err != nil {
fmt.Println("Error while connecting to the printer server")
return nil, price, err
}
return socket, price, nil
}

37
api/json_structs.go Normal file
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@ -0,0 +1,37 @@
package api
/**
* Commands to give to the API
*/
type JSONCommand interface {
PrintCommand | PizzaCommand | GetPizzasCommand
}
type PrintCommand struct {
Command string `json:"command"`
Text string `json:"text"`
}
type PizzaCommand struct {
Command string `json:"command"`
Pizzas []Pizza `json:"pizzas"`
}
type GetPizzasCommand struct {
Command string `json:"command"`
}
/**
* What to receive from the API
*/
type JSONReceived interface {
ReceivePizzas | ReceivePrice
}
type ReceivePizzas struct {
Pizzas []Pizza `json:"pizzas"`
}
type ReceivePrice struct {
TotalPrice int `json:"total_price"`
}

78
api/protocol.go Normal file
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@ -0,0 +1,78 @@
package api
import (
"encoding/binary"
"encoding/json"
"fmt"
"net"
)
var (
printer_server_IP = net.ParseIP("127.0.0.1")
printer_server_port = 4444
)
/**
* All messages from and to the API must have the first 4 bytes set to represent
* the length of the message, followed by the message itself
*/
func sendJSONToServer[T JSONCommand](socket *net.TCPConn, json_command T) (*net.TCPConn, error) {
json_data, err := json.Marshal(json_command)
if err != nil {
return nil, err
}
// in case a socket doesn't already exist create a new one
if socket == nil {
socket, err = net.DialTCP("tcp4", nil, &net.TCPAddr{printer_server_IP, printer_server_port, ""})
}
if err != nil {
return nil, err
}
// the first 4 bytes must be the length of the message
to_send := make([]byte, 4)
binary.LittleEndian.PutUint32(to_send, uint32(len(json_data)))
to_send = append(to_send, json_data...)
socket.Write([]byte(to_send))
return socket, nil
}
func receiveJSONFromServer[T JSONReceived](socket *net.TCPConn, json_received *T) (*net.TCPConn, error) {
var err error
// in case a socket doesn't already exist create a new one
if socket == nil {
fmt.Println("nil")
socket, err = net.DialTCP("tcp4", nil, &net.TCPAddr{printer_server_IP, printer_server_port, ""})
}
if err != nil {
return nil, err
}
// the first 4 bytes are the length of the message
b := make([]byte, 4)
_, err = socket.Read(b[0:])
if err != nil {
return nil, err
}
body_length := binary.LittleEndian.Uint32(b)
body := make([]byte, body_length)
_, err = socket.Read(body[0:])
err = json.Unmarshal(body, json_received)
if err != nil {
return nil, err
}
return socket, nil
}

221
main.go
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@ -3,16 +3,18 @@ package main
import (
"fmt"
"os"
"strconv"
"strings"
"Scontrini-TUI-Client/api"
"github.com/gdamore/tcell/v2"
"github.com/rivo/tview"
)
const (
USB_SERIAL_PORT = "/dev/ttyUSB0"
MAIN_WIDTH = 240
MAIN_HEIGHT = 55
MAIN_WIDTH = 240
MAIN_HEIGHT = 55
)
var (
@ -31,23 +33,18 @@ func main() {
}
}
func writeToPrinter(text string) {
// move outside
serial_port, err := os.OpenFile(USB_SERIAL_PORT, os.O_WRONLY, 0755)
if err != nil {
panic(err)
}
fmt.Fprintln(serial_port, text)
}
/**
* If text gets piped from terminal, print it
* If text gets piped from terminal, send it to the API
*/
func printFromStdIn() {
text := ""
fmt.Scanf("%s", text)
writeToPrinter(text)
fmt.Scanf("%s", &text)
_, err := api.SendPrintCommand(nil, text)
if err != nil {
os.Exit(1)
}
}
func startTui() {
@ -66,10 +63,10 @@ func startTui() {
}
/**
* Return a page with a TextView used to print
* Return a page with a TextView used to print text
*/
func createPrintPage(width, height int) *tview.Grid {
page := tview.NewGrid()
print_page := tview.NewGrid()
textview := tview.NewTextView().
SetText("[green]SCRIVI QUELLO CHE VUOI STAMPARE[white]").
@ -82,7 +79,11 @@ func createPrintPage(width, height int) *tview.Grid {
print_button := tview.NewButton("Stampa").
SetSelectedFunc(func() {
writeToPrinter(textarea.GetText())
_, err := api.SendPrintCommand(nil, textarea.GetText())
if err != nil {
os.Exit(1) // TODO: add error page
}
})
pizza_button := tview.NewButton("Pizza").
@ -118,14 +119,14 @@ func createPrintPage(width, height int) *tview.Grid {
return event
})
page.SetColumns(1/5, 1/5, 1/5, 1/5, 1/5).
print_page.SetColumns(1/5, 1/5, 1/5, 1/5, 1/5).
SetRows(1/5, 1/5, 1/5, 1/5, 1/5).
AddItem(textview, 1, 1, 1, 3, 0, 0, false).
AddItem(textarea, 2, 1, 1, 3, 0, 0, true).
AddItem(print_button, 3, 1, 1, 1, 0, 0, false).
AddItem(pizza_button, 3, 3, 1, 1, 0, 0, false)
return page
return print_page
}
/**
@ -140,17 +141,41 @@ func createPizzaPage(width, height int) *tview.Grid {
SetDynamicColors(true)
setCommonBoxAttributes(textview.Box, "Scontrini")
// get a list of all the pizzas
socket, err := api.SendGetPizzasCommand(nil)
if err != nil {
os.Exit(1) // TODO: error page
}
_, pizzas_json, err := api.ReceivePizzasCommand(socket)
row_index := 0
table := tview.NewTable().
SetBorders(true).
InsertRow(row_index).
InsertColumn(0).
InsertColumn(1)
setCommonBoxAttributes(table.Box, "")
InsertColumn(1).
InsertColumn(2)
table.SetCellSimple(0, 0, "Quantità")
table.SetCellSimple(0, 1, "Pizza")
table.SetCellSimple(0, 0, "Pizza")
table.SetCellSimple(0, 1, "Prezzo")
table.SetCellSimple(0, 2, "Quantità")
// make the rows selectable
table.SetSelectable(true, false)
// populate the table
for _, v := range pizzas_json.Pizzas {
row_index += 1
table.InsertRow(row_index)
table.SetCellSimple(row_index, 0, v.Name)
table.SetCellSimple(row_index, 1, strconv.Itoa(v.Price))
table.SetCellSimple(row_index, 2, "0")
}
setCommonBoxAttributes(table.Box, "")
print_button := tview.NewButton("Stampa").
SetSelectedFunc(func() {
@ -159,7 +184,7 @@ func createPizzaPage(width, height int) *tview.Grid {
pizza_button := tview.NewButton("Pizza").
SetSelectedFunc(func() {
printPizza(table)
sendOrder(table)
})
// define keys and behaviour for selected events
@ -169,10 +194,26 @@ func createPizzaPage(width, height int) *tview.Grid {
return nil
}
if event.Key() == tcell.KeyEnter {
row_index += 1
table.InsertRow(row_index)
App.Draw()
// increase/decrease the quantity column of the selected row
if event.Rune() == '+' || event.Rune() == '-' {
selected_row, _ := table.GetSelection()
if selected_row == 0 {
return event
}
current_quantity, err := strconv.Atoi(table.GetCell(selected_row, 2).Text)
if err != nil {
os.Exit(1)
}
if event.Rune() == '+' {
table.SetCellSimple(selected_row, 2, strconv.Itoa(current_quantity+1))
} else {
if current_quantity > 0 {
table.SetCellSimple(selected_row, 2, strconv.Itoa(current_quantity-1))
}
}
return nil
}
@ -208,10 +249,122 @@ func createPizzaPage(width, height int) *tview.Grid {
}
/**
* Format the pizza order table and print it
* Return a page with a Table used to show the pizza order
*/
func printPizza(table *tview.Table) {
// TODO
func createOrderPage(width, height int, pizzas []api.Pizza, price int) *tview.Grid {
order_page := tview.NewGrid()
textview := tview.NewTextView().
SetText("[green]IL TUO ORDINE\n\nPrezzo Totale: [red]" + strconv.Itoa(price) + "€[white]").
SetTextAlign(tview.AlignCenter).
SetDynamicColors(true)
setCommonBoxAttributes(textview.Box, "Scontrini")
row_index := 0
table := tview.NewTable().
InsertRow(row_index).
InsertColumn(0).
InsertColumn(1)
table.SetCellSimple(0, 0, "Pizza")
table.SetCellSimple(0, 1, "Quantità")
// populate the table
for _, v := range pizzas {
row_index += 1
table.InsertRow(row_index)
table.SetCellSimple(row_index, 0, v.Name)
table.SetCellSimple(row_index, 1, strconv.Itoa(v.Quantity))
}
setCommonBoxAttributes(table.Box, "")
print_button := tview.NewButton("Stampa").
SetSelectedFunc(func() {
Pages.RemovePage("order")
Pages.SwitchToPage("print")
})
pizza_button := tview.NewButton("Pizza").
SetSelectedFunc(func() {
Pages.RemovePage("order")
Pages.SwitchToPage("pizza")
})
// define keys and behaviour for selected events
table.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
if event.Key() == tcell.KeyTAB {
App.SetFocus(print_button)
return nil
}
return event
})
print_button.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
if event.Key() == tcell.KeyTAB {
App.SetFocus(pizza_button)
return nil
}
return event
})
pizza_button.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
if event.Key() == tcell.KeyTAB {
App.SetFocus(table)
return nil
}
return event
})
order_page.SetColumns(1/5, 1/5, 1/5, 1/5, 1/5).
SetRows(1/5, 1/5, 1/5, 1/5, 1/5).
AddItem(textview, 1, 1, 1, 3, 0, 0, false).
AddItem(table, 2, 2, 1, 1, 0, 0, true).
AddItem(print_button, 3, 1, 1, 1, 0, 0, false).
AddItem(pizza_button, 3, 3, 1, 1, 0, 0, false)
return order_page
}
/**
* Format the pizza order from the table and send it to the API
*/
func sendOrder(table *tview.Table) {
pizzas := make([]api.Pizza, 0)
// populate the slice with pizzas from the table
for i := 1; i < table.GetRowCount(); i++ {
name := table.GetCell(i, 0).Text
quantity, err := strconv.Atoi(table.GetCell(i, 2).Text)
if err != nil {
os.Exit(1)
}
if quantity > 0 {
pizzas = append(pizzas, api.Pizza{name, 0, quantity})
}
}
socket, err := api.SendPizzaCommand(nil, pizzas)
if err != nil {
os.Exit(1) // TODO: add error page
}
_, price, err := api.ReceivePriceCommand(socket)
if err != nil {
os.Exit(1) // TODO: add error page
}
order_page := createOrderPage(MAIN_WIDTH, MAIN_HEIGHT, pizzas, price.TotalPrice)
Pages.AddAndSwitchToPage("order", order_page, true)
}
/**