packages/hyprspace: implement RPC server

packages/networking/hyprspace/cli/up.go

@@ -5,7 +5,7 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
-	"log"
+	"io/fs"
 	"net"
 	"os"
 	"os/signal"
@@ -18,12 +18,14 @@ import (
 	"github.com/DataDrake/cli-ng/v2/cmd"
 	"github.com/hyprspace/hyprspace/config"
 	"github.com/hyprspace/hyprspace/p2p"
+	hsrpc "github.com/hyprspace/hyprspace/rpc"
 	"github.com/hyprspace/hyprspace/tun"
 	dht "github.com/libp2p/go-libp2p-kad-dht"
 	"github.com/libp2p/go-libp2p/core/event"
 	"github.com/libp2p/go-libp2p/core/host"
 	"github.com/libp2p/go-libp2p/core/network"
 	"github.com/libp2p/go-libp2p/core/peer"
+	"github.com/multiformats/go-multiaddr"
 	"github.com/multiformats/go-multibase"
 )
 
@@ -36,6 +38,10 @@ var (
 	RevLookup map[string]string
 	// activeStreams is a map of active streams to a peer
 	activeStreams map[string]network.Stream
+	// context
+	ctx context.Context
+	// context cancel function
+	ctxCancel func()
 )
 
 // Up creates and brings up a Hyprspace Interface.
@@ -112,7 +118,7 @@ func UpRun(r *cmd.Root, c *cmd.Sub) {
 	}
 
 	// Setup System Context
-	ctx := context.Background()
+	ctx, ctxCancel = context.WithCancel(context.Background())
 
 	fmt.Println("[+] Creating LibP2P Node")
 
@@ -152,10 +158,13 @@ func UpRun(r *cmd.Root, c *cmd.Sub) {
 	lockPath := filepath.Join(filepath.Dir(cfg.Path), cfg.Interface.Name+".lock")
 
 	// Register the application to listen for signals
-	go signalHandler(host, lockPath, dht)
+	go signalHandler(ctx, host, lockPath, dht)
 
 	// Log about various events
-	go eventLogger(host, cfg)
+	go eventLogger(ctx, host, cfg)
+
+	// RPC server
+	go hsrpc.RpcServer(ctx, multiaddr.StringCast(fmt.Sprintf("/unix/run/hyprspace-rpc.%s.sock", cfg.Interface.Name)), host, *cfg)
 
 	// Write lock to filesystem to indicate an existing running daemon.
 	err = os.WriteFile(lockPath, []byte(fmt.Sprint(os.Getpid())), os.ModePerm)
@@ -183,8 +192,13 @@ func UpRun(r *cmd.Root, c *cmd.Sub) {
 	for {
 		// Read in a packet from the tun device.
 		plen, err := tunDev.Iface.Read(packet)
-		if err != nil {
-			log.Println(err)
+		if errors.Is(err, fs.ErrClosed) {
+			fmt.Println("[-] Interface closed")
+			<-ctx.Done()
+			time.Sleep(1 * time.Second)
+			return
+		} else if err != nil {
+			fmt.Println(err)
 			continue
 		}
 
@@ -255,7 +269,7 @@ func UpRun(r *cmd.Root, c *cmd.Sub) {
 	}
 }
 
-func signalHandler(host host.Host, lockPath string, dht *dht.IpfsDHT) {
+func signalHandler(ctx context.Context, host host.Host, lockPath string, dht *dht.IpfsDHT) {
 	exitCh := make(chan os.Signal, 1)
 	rebootstrapCh := make(chan os.Signal, 1)
 	signal.Notify(exitCh, syscall.SIGINT, syscall.SIGTERM)
@@ -263,6 +277,8 @@ func signalHandler(host host.Host, lockPath string, dht *dht.IpfsDHT) {
 
 	for {
 		select {
+		case <-ctx.Done():
+			return
 		case <-rebootstrapCh:
 			fmt.Println("[-] Rebootstrapping on SIGUSR1")
 			host.ConnManager().TrimOpenConns(context.Background())
@@ -279,17 +295,20 @@ func signalHandler(host host.Host, lockPath string, dht *dht.IpfsDHT) {
 
 			fmt.Println("Received signal, shutting down...")
 
-			// Exit the application.
-			os.Exit(0)
+			tunDev.Iface.Close()
+			tunDev.Down()
+			ctxCancel()
 		}
 	}
 }
 
-func eventLogger(host host.Host, cfg *config.Config) {
+func eventLogger(ctx context.Context, host host.Host, cfg *config.Config) {
 	subCon, err := host.EventBus().Subscribe(new(event.EvtPeerConnectednessChanged))
 	checkErr(err)
 	for {
 		select {
+		case <-ctx.Done():
+			return
 		case ev := <-subCon.Out():
 			evt := ev.(event.EvtPeerConnectednessChanged)
 			for vpnIp, vpnPeer := range cfg.Peers {

packages/networking/hyprspace/project.nix

@@ -24,6 +24,7 @@
           "cli"
           "config"
           "p2p"
+          "rpc"
           "tun"
         ]);
       };

packages/networking/hyprspace/rpc/server.go

@@ -0,0 +1,81 @@
+package rpc
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net"
+	"net/rpc"
+	"os"
+
+	"github.com/hyprspace/hyprspace/config"
+	"github.com/libp2p/go-libp2p/core/host"
+	"github.com/libp2p/go-libp2p/core/network"
+	"github.com/libp2p/go-libp2p/core/peer"
+	"github.com/multiformats/go-multiaddr"
+)
+
+type HyprspaceRPC struct {
+	host   host.Host
+	config config.Config
+}
+
+func (hsr *HyprspaceRPC) Status(args *Args, reply *StatusReply) error {
+	netPeersCurrent := 0
+	var netPeerAddrsCurrent []string
+	for _, id := range hsr.config.Peers {
+		peerId, err := peer.Decode(id.ID)
+		if err != nil {
+			return err
+		}
+		if hsr.host.Network().Connectedness(peerId) == network.Connected {
+			netPeersCurrent = netPeersCurrent + 1
+			for _, c := range hsr.host.Network().ConnsToPeer(peerId) {
+				netPeerAddrsCurrent = append(netPeerAddrsCurrent, fmt.Sprintf("%s/p2p/%s", c.RemoteMultiaddr().String(), peerId.String()))
+			}
+		}
+	}
+	var addrStrings []string
+	for _, ma := range hsr.host.Addrs() {
+		addrStrings = append(addrStrings, ma.String())
+	}
+	*reply = StatusReply{
+		hsr.host.ID().String(),
+		len(hsr.host.Network().Conns()),
+		netPeersCurrent,
+		netPeerAddrsCurrent,
+		len(hsr.config.Peers),
+		addrStrings,
+	}
+	return nil
+}
+
+func (hsr *HyprspaceRPC) Peers(args *Args, reply *PeersReply) error {
+	var peerAddrs []string
+	for _, c := range hsr.host.Network().Conns() {
+		peerAddrs = append(peerAddrs, fmt.Sprintf("%s/p2p/%s", c.RemoteMultiaddr().String(), c.RemotePeer().String()))
+	}
+	*reply = PeersReply{peerAddrs}
+	return nil
+}
+
+func RpcServer(ctx context.Context, ma multiaddr.Multiaddr, host host.Host, config config.Config) {
+	hsr := HyprspaceRPC{host, config}
+	rpc.Register(&hsr)
+
+	addr, err := ma.ValueForProtocol(multiaddr.P_UNIX)
+	if err != nil {
+		log.Fatal("[!] Failed to parse multiaddr: ", err)
+	}
+	var lc net.ListenConfig
+	l, err := lc.Listen(ctx, "unix", addr)
+	os.Chmod(addr, 0o0770)
+	if err != nil {
+		log.Fatal("[!] Failed to launch RPC server: ", err)
+	}
+	fmt.Println("[-] RPC server ready")
+	go rpc.Accept(l)
+	<-ctx.Done()
+	fmt.Println("[-] Closing RPC server")
+	l.Close()
+}

packages/networking/hyprspace/rpc/types.go

@@ -0,0 +1,17 @@
+package rpc
+
+type Args struct {
+}
+
+type StatusReply struct {
+	PeerID              string
+	SwarmPeersCurrent   int
+	NetPeersCurrent     int
+	NetPeerAddrsCurrent []string
+	NetPeersMax         int
+	ListenAddrs         []string
+}
+
+type PeersReply struct {
+	PeerAddrs []string
+}