restructured the project to comply community guideline, for others check release note

internal/common/args.go

@@ -0,0 +1,53 @@
+package common
+
+import (
+	"flag"
+
+	"github.com/sirupsen/logrus"
+	E "github.com/yusing/go-proxy/internal/error"
+)
+
+type Args struct {
+	Command string
+}
+
+const (
+	CommandStart              = ""
+	CommandSetup              = "setup"
+	CommandValidate           = "validate"
+	CommandListConfigs        = "ls-config"
+	CommandListRoutes         = "ls-routes"
+	CommandReload             = "reload"
+	CommandDebugListEntries   = "debug-ls-entries"
+	CommandDebugListProviders = "debug-ls-providers"
+)
+
+var ValidCommands = []string{
+	CommandStart,
+	CommandSetup,
+	CommandValidate,
+	CommandListConfigs,
+	CommandListRoutes,
+	CommandReload,
+	CommandDebugListEntries,
+	CommandDebugListProviders,
+}
+
+func GetArgs() Args {
+	var args Args
+	flag.Parse()
+	args.Command = flag.Arg(0)
+	if err := validateArg(args.Command); err.HasError() {
+		logrus.Fatal(err)
+	}
+	return args
+}
+
+func validateArg(arg string) E.NestedError {
+	for _, v := range ValidCommands {
+		if arg == v {
+			return nil
+		}
+	}
+	return E.Invalid("argument", arg)
+}