Merge pull request #11 from hyprspace/feature/experience-improvements

Improve Error Handling & Allow Multiple Interfaces

.gitignore

@@ -1 +1,2 @@
-hyprspace
+hyprspace
+.DS_Store

cli/init.go

@@ -55,6 +55,7 @@ func InitRun(r *cmd.Root, c *cmd.Sub) {
 	new := config.Config{
 		Interface: config.Interface{
 			Name:        args.InterfaceName,
+			ListenPort:  8001,
 			Address:     "10.1.1.1/24",
 			ID:          host.ID().Pretty(),
 			PrivateKey:  string(keyBytes),

cli/root.go

@@ -9,6 +9,8 @@ import (
 	"github.com/DataDrake/cli-ng/v2/cmd"
 )
 
+var appVersion string = "develop"
+
 //GlobalFlags contains the flags for commands.
 type GlobalFlags struct {
 	Config string `short:"c" long:"config" desc:"Specify a custom config path."`
@@ -19,15 +21,18 @@ var Root *cmd.Root
 
 func init() {
 	Root = &cmd.Root{
-		Name:  "hyprspace",
-		Short: "Hyprspace Distributed Network",
-		Flags: &GlobalFlags{},
+		Name:    "hyprspace",
+		Short:   "Hyprspace Distributed Network",
+		Version: appVersion,
+		Flags:   &GlobalFlags{},
 	}
+
 	cmd.Register(&cmd.Help)
 	cmd.Register(&Init)
 	cmd.Register(&Up)
 	cmd.Register(&Down)
 	cmd.Register(&Update)
+	cmd.Register(&cmd.Version)
 }
 
 func checkErr(err error) {

cli/up.go

@@ -3,11 +3,14 @@ package cli
 import (
 	"bufio"
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"log"
+	"net"
 	"os"
 	"os/signal"
+	"strconv"
 	"strings"
 	"syscall"
 	"time"
@@ -75,15 +78,18 @@ func UpRun(r *cmd.Root, c *cmd.Sub) {
 
 	if !flags.Foreground {
 		// Make results chan
-		out := make(chan bool)
+		out := make(chan error)
 		go createDaemon(out)
 
 		select {
-		case <-out:
+		case err = <-out:
 		case <-time.After(30 * time.Second):
 		}
-		checkErr(err)
-		fmt.Println("[+] Successfully Created Hyprspace Daemon")
+		if err != nil {
+			fmt.Println("[+] Failed to Create Hyprspace Daemon")
+		} else {
+			fmt.Println("[+] Successfully Created Hyprspace Daemon")
+		}
 		return
 	}
 
@@ -96,7 +102,9 @@ func UpRun(r *cmd.Root, c *cmd.Sub) {
 	fmt.Println("[+] Creating TUN Device")
 	// Create new TUN device
 	iface, err = tun.New(Global.Interface.Name)
-	checkErr(err)
+	if err != nil {
+		checkErr(errors.New("interface already in use"))
+	}
 	// Set TUN MTU
 	tun.SetMTU(Global.Interface.Name, 1420)
 	// Add Address to Interface
@@ -106,8 +114,35 @@ func UpRun(r *cmd.Root, c *cmd.Sub) {
 	ctx := context.Background()
 
 	fmt.Println("[+] Creating LibP2P Node")
+
+	// Check that the listener port is available.
+	var ln net.Listener
+	port := Global.Interface.ListenPort
+	if port != 8001 {
+		ln, err = net.Listen("tcp", ":"+strconv.Itoa(port))
+		if err != nil {
+			checkErr(errors.New("could not create node, listen port already in use by something else"))
+		}
+	} else {
+		for {
+			ln, err = net.Listen("tcp", ":"+strconv.Itoa(port))
+			if err == nil {
+				break
+			}
+			if port >= 65535 {
+				checkErr(errors.New("failed to find open port"))
+			}
+			port++
+		}
+	}
+	if ln != nil {
+		ln.Close()
+	}
 	// Create P2P Node
-	host, dht, err := p2p.CreateNode(ctx, Global.Interface.PrivateKey, streamHandler)
+	host, dht, err := p2p.CreateNode(ctx,
+		Global.Interface.PrivateKey,
+		port,
+		streamHandler)
 	checkErr(err)
 
 	// Setup Peer Table for Quick Packet --> Dest ID lookup
@@ -162,7 +197,7 @@ func UpRun(r *cmd.Root, c *cmd.Sub) {
 	}
 }
 
-func createDaemon(out chan<- bool) {
+func createDaemon(out chan<- error) {
 	path, err := os.Executable()
 	checkErr(err)
 	// Create Pipe to monitor for daemon output.
@@ -173,7 +208,7 @@ func createDaemon(out chan<- bool) {
 		path,
 		append(os.Args, "--foreground"),
 		&os.ProcAttr{
-			Files: []*os.File{nil, w, nil},
+			Files: []*os.File{nil, w, w},
 		},
 	)
 	checkErr(err)
@@ -186,7 +221,10 @@ func createDaemon(out chan<- bool) {
 	fmt.Println(scanner.Text())
 	err = process.Release()
 	checkErr(err)
-	out <- true
+	if count < 4 {
+		out <- errors.New("failed to create daemon")
+	}
+	out <- nil
 }
 
 func streamHandler(stream network.Stream) {

cli/update.go

@@ -14,8 +14,6 @@ import (
 	"github.com/tcnksm/go-latest"
 )
 
-var appVersion string
-
 // Update checks for a new version of the Hyprspace program and updates itself
 // if a newer version is found and the user agrees to update.
 var Update = cmd.Sub{

config/config.go

@@ -15,8 +15,9 @@ type Config struct {
 // Interface defines all of the fields that a local node needs to know about itself!
 type Interface struct {
 	Name        string `yaml:"name"`
-	Address     string `yaml:"address"`
 	ID          string `yaml:"id"`
+	ListenPort  int    `yaml:"listen_port"`
+	Address     string `yaml:"address"`
 	DiscoverKey string `yaml:"discover_key"`
 	PrivateKey  string `yaml:"private_key"`
 }
@@ -32,6 +33,16 @@ func Read(path string) (result Config, err error) {
 	if err != nil {
 		return
 	}
+	result = Config{
+		Interface: Interface{
+			Name:        "hs0",
+			ListenPort:  8001,
+			Address:     "10.1.1.1",
+			ID:          "",
+			DiscoverKey: "",
+			PrivateKey:  "",
+		},
+	}
 	err = yaml.Unmarshal(in, &result)
 	return
 }

p2p/discover.go

@@ -18,7 +18,7 @@ func Discover(ctx context.Context, h host.Host, dht *dht.IpfsDHT, rendezvous str
 	var routingDiscovery = discovery.NewRoutingDiscovery(dht)
 	discovery.Advertise(ctx, routingDiscovery, rendezvous)
 
-	ticker := time.NewTicker(time.Second * 1)
+	ticker := time.NewTicker(time.Second * 5)
 	defer ticker.Stop()
 
 	for {

p2p/node.go

@@ -18,7 +18,7 @@ import (
 const Protocol = "/hyprspace/0.0.1"
 
 // CreateNode creates an internal Libp2p nodes and returns it and it's DHT Discovery service.
-func CreateNode(ctx context.Context, inputKey string, handler network.StreamHandler) (node host.Host, dhtOut *dht.IpfsDHT, err error) {
+func CreateNode(ctx context.Context, inputKey string, port int, handler network.StreamHandler) (node host.Host, dhtOut *dht.IpfsDHT, err error) {
 	// Unmarshal Private Key
 	privateKey, err := crypto.UnmarshalPrivateKey([]byte(inputKey))
 	if err != nil {
@@ -27,7 +27,7 @@ func CreateNode(ctx context.Context, inputKey string, handler network.StreamHand
 
 	// Create libp2p node
 	node, err = libp2p.New(ctx,
-		libp2p.ListenAddrStrings(fmt.Sprintf("/ip4/0.0.0.0/tcp/%d", 8001)),
+		libp2p.ListenAddrStrings(fmt.Sprintf("/ip4/0.0.0.0/tcp/%d", port)),
 		libp2p.Identity(privateKey),
 	)
 	if err != nil {