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main.go
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main.go
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package main
import (
"flag"
"fmt"
"net"
"time"
"github.com/AlecAivazis/survey/v2"
"github.com/chiahsoon/cz4013-client/config"
"github.com/chiahsoon/cz4013-client/handlers"
"github.com/chiahsoon/cz4013-client/models"
"github.com/chiahsoon/cz4013-client/services"
)
func connect(host string, port string) *net.UDPConn {
addr := fmt.Sprintf("%s:%s", host, port)
s, err := net.ResolveUDPAddr("udp4", addr)
if err != nil {
panic(err)
}
conn, err := net.DialUDP("udp4", nil, s)
if err != nil {
panic(err)
}
return conn
}
func main() {
host := flag.String("host", "localhost", "IP address of the server")
port := flag.String("port", "5000", "Port of the server")
semantic := flag.String("semantic", string(config.AtLeastOnce), "Invocation Semantic - at-least-once (Default), at-most-once")
flag.Parse()
// Initialise command line configurations
config.Global = &config.Config{}
config.Global.InvocationSemantic = config.InvocationSemantic(*semantic)
config.Global.Host = *host
config.Global.Port = *port
if err := config.Global.Validate(); err != nil {
panic(err)
}
// Initialise server connection
conn := connect(config.Global.Host, config.Global.Port)
defer conn.Close()
// Initialise services
services.PP = &services.PrettyPrinter{}
services.UI = &services.UIService{}
services.ConnSvc = &services.ConnectionService{}
services.ConnSvc.InvocationSemantic = config.Global.InvocationSemantic
services.ConnSvc.TimeoutInterval = time.Duration(1) * time.Second
services.ConnSvc.MaxRetryCount = -1
// Handle user actions
actionIdx := -1
for {
if err := survey.AskOne(services.UI.GetMainPrompt(), &actionIdx); err != nil {
fmt.Println(err)
return
}
action := models.UserSelectedAction(actionIdx)
if err := action.IsValid(); err != nil {
fmt.Println("Exiting ...")
return
}
handlers.HandleOpenAccount(action, conn)
handlers.HandleCloseAccount(action, conn)
handlers.HandleGetBalance(action, conn)
handlers.HandleDeposit(action, conn)
handlers.HandleWithdraw(action, conn)
handlers.HandleMonitor(action, conn)
handlers.HandleCheckState(action, conn)
handlers.HandleTransfer(action, conn)
}
}