meta: add IPAddrs to the session info

pkg/meta/base.go

@@ -427,11 +427,23 @@ func (m *baseMeta) newSessionInfo() []byte {
 	host, err := os.Hostname()
 	if err != nil {
 		logger.Warnf("Failed to get hostname: %s", err)
-		host = ""
+	}
+	ips, err := utils.FindLocalIPs()
+	if err != nil {
+		logger.Warnf("Failed to get local IP: %s", err)
+	}
+	addrs := make([]string, 0, len(ips))
+	for _, i := range ips {
+		if ip := i.String(); ip[0] == '?' {
+			logger.Warnf("Invalid IP address: %s", ip)
+		} else {
+			addrs = append(addrs, ip)
+		}
 	}
 	buf, err := json.Marshal(&SessionInfo{
 		Version:    version.Version(),
 		HostName:   host,
+		IPAddrs:    addrs,
 		MountPoint: m.conf.MountPoint,
 		ProcessID:  os.Getpid(),
 	})

pkg/meta/base_test.go

@@ -1362,8 +1362,8 @@ func testCloseSession(t *testing.T, m Meta) {
 	if err != nil {
 		t.Fatalf("get session: %s", err)
 	}
-	var empty SessionInfo
-	if s.SessionInfo != empty {
+	if s.SessionInfo.Version != "" || s.SessionInfo.HostName != "" || s.SessionInfo.IPAddrs != nil ||
+		s.SessionInfo.MountPoint != "" || s.SessionInfo.ProcessID != 0 {
 		t.Fatalf("incorrect session info %+v", s.SessionInfo)
 	}
 	if len(s.Flocks) != 0 || len(s.Plocks) != 0 || len(s.Sustained) != 0 {

pkg/meta/interface.go

@@ -246,6 +246,7 @@ type TreeSummary struct {
 type SessionInfo struct {
 	Version    string
 	HostName   string
+	IPAddrs    []string `json:",omitempty"`
 	MountPoint string
 	ProcessID  int
 }

pkg/sync/cluster.go

@@ -20,7 +20,6 @@ import (
 	"bufio"
 	"bytes"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io"
 	"net"
@@ -35,6 +34,7 @@ import (
 	"github.com/oliverisaac/shellescape"
 
 	"github.com/juicedata/juicefs/pkg/object"
+	"github.com/juicedata/juicefs/pkg/utils"
 )
 
 // Stat has the counters to represent the progress.
@@ -97,43 +97,6 @@ func sendStats(addr string) {
 	}
 }
 
-func findLocalIP() (string, error) {
-	ifaces, err := net.Interfaces()
-	if err != nil {
-		return "", err
-	}
-	for _, iface := range ifaces {
-		if iface.Flags&net.FlagUp == 0 {
-			continue // interface down
-		}
-		if iface.Flags&net.FlagLoopback != 0 {
-			continue // loopback interface
-		}
-		addrs, err := iface.Addrs()
-		if err != nil {
-			return "", err
-		}
-		for _, addr := range addrs {
-			var ip net.IP
-			switch v := addr.(type) {
-			case *net.IPNet:
-				ip = v.IP
-			case *net.IPAddr:
-				ip = v.IP
-			}
-			if ip == nil || ip.IsLoopback() {
-				continue
-			}
-			ip = ip.To4()
-			if ip == nil {
-				continue // not an ipv4 address
-			}
-			return ip.String(), nil
-		}
-	}
-	return "", errors.New("are you connected to the network?")
-}
-
 func startManager(tasks <-chan object.Object) (string, error) {
 	http.HandleFunc("/fetch", func(w http.ResponseWriter, req *http.Request) {
 		var objs []object.Object
@@ -186,9 +149,19 @@ func startManager(tasks <-chan object.Object) (string, error) {
 		logger.Debugf("receive stats %+v from %s", r, req.RemoteAddr)
 		_, _ = w.Write([]byte("OK"))
 	})
-	ip, err := findLocalIP()
+	ips, err := utils.FindLocalIPs()
 	if err != nil {
-		return "", fmt.Errorf("find local ip: %s", err)
+		return "", fmt.Errorf("find local ips: %s", err)
+	}
+	var ip string
+	for _, i := range ips {
+		if i = i.To4(); i != nil {
+			ip = i.String()
+			break
+		}
+	}
+	if ip == "" {
+		return "", fmt.Errorf("no local ip found")
 	}
 	l, err := net.Listen("tcp", ip+":")
 	if err != nil {

pkg/utils/utils.go

@@ -68,6 +68,39 @@ func GetLocalIp(address string) (string, error) {
 	return ip, nil
 }
 
+func FindLocalIPs() ([]net.IP, error) {
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+	var ips []net.IP
+	for _, iface := range ifaces {
+		if iface.Flags&net.FlagUp == 0 {
+			continue // interface down
+		}
+		if iface.Flags&net.FlagLoopback != 0 {
+			continue // loopback interface
+		}
+		addrs, err := iface.Addrs()
+		if err != nil {
+			continue
+		}
+		for _, addr := range addrs {
+			var ip net.IP
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+			case *net.IPAddr:
+				ip = v.IP
+			}
+			if len(ip) > 0 && !ip.IsLoopback() {
+				ips = append(ips, ip)
+			}
+		}
+	}
+	return ips, nil
+}
+
 func WithTimeout(f func() error, timeout time.Duration) error {
 	var done = make(chan int, 1)
 	var t = time.NewTimer(timeout)