add node structure (cmd, config...)

cmd/cmd.go

@@ -0,0 +1,40 @@
+package cmd
+
+import (
+	"go-dht/config"
+	"go-dht/node"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/urfave/cli"
+)
+
+var NodeCommands = []cli.Command{
+	{
+		Name:   "start",
+		Usage:  "start the node",
+		Action: cmdStart,
+	},
+}
+
+func cmdStart(c *cli.Context) error {
+	if err := config.MustRead(c); err != nil {
+		return err
+	}
+
+	var n node.Node
+	var err error
+	if config.C.ID != "" {
+		n, err = node.LoadNode(config.C.ID)
+		if err != nil {
+			return err
+		}
+		log.Info("Node loaded with ID: ", n.ID())
+	} else {
+		n, err = node.NewNode()
+		if err != nil {
+			return err
+		}
+		log.Info("New node created with ID: ", n.ID())
+	}
+	return nil
+}