localdiscovery fixes:

replace zeroconf with fork; sort interfaces; disable ipv6, tollerate long zeroconf shutodown

net/addrs/common.go

@@ -1,8 +1,13 @@
 package addrs
 
 import (
-	"golang.org/x/exp/slices"
 	"net"
+	"regexp"
+	"strconv"
+
+	"golang.org/x/exp/slices"
+
+	"github.com/anytypeio/go-anytype-middleware/util/slice"
 )
 
 type Interface struct {
@@ -32,6 +37,49 @@ func (i InterfacesAddrs) Equal(other InterfacesAddrs) bool {
 	return slices.Equal(myStr, otherStr)
 }
 
+var re = regexp.MustCompile(`^(.*?)([0-9]*)$`)
+
+func (i InterfacesAddrs) SortWithPriority(priority []string) {
+	f := func(ifName string) (prefix string, num int) {
+		res := re.FindStringSubmatch(ifName)
+
+		if len(res) > 1 {
+			prefix = res[1]
+		}
+		if len(res) > 2 {
+			num, _ = strconv.Atoi(res[2])
+		}
+		return
+	}
+
+	slices.SortFunc(i.Interfaces, func(a, b net.Interface) bool {
+		aPrefix, aNum := f(a.Name)
+		bPrefix, bNum := f(b.Name)
+
+		aPrioirity := slice.FindPos(priority, aPrefix)
+		bPrioirity := slice.FindPos(priority, bPrefix)
+
+		if aPrefix == bPrefix {
+			return aNum < bNum
+		} else if aPrioirity == -1 && bPrioirity == -1 {
+			// sort alphabetically
+			return aPrefix < bPrefix
+		} else if aPrioirity != -1 && bPrioirity != -1 {
+			// in case we have [eth, wlan]
+			if aPrioirity == bPrioirity {
+				// prioritize eth0 over wlan0
+				return aPrioirity < bPrioirity
+			}
+			// prioritise wlan1 over eth8
+			return aNum < bNum
+		} else if aPrioirity != -1 {
+			return true
+		} else {
+			return false
+		}
+	})
+}
+
 func getStrings(i InterfacesAddrs) (allStrings []string) {
 	for _, i := range i.Interfaces {
 		allStrings = append(allStrings, i.Name)

net/addrs/interface.go

@@ -3,7 +3,11 @@
 
 package addrs
 
-import "net"
+import (
+	"net"
+
+	"github.com/anytypeio/go-anytype-middleware/util/slice"
+)
 
 func SetInterfaceAddrsGetter(getter InterfaceAddrsGetter) {}
 
@@ -28,5 +32,9 @@ func GetInterfacesAddrs() (iAddrs InterfacesAddrs, err error) {
 		return
 	}
 	iAddrs.Interfaces = ifaces
+
+	iAddrs.Interfaces = slice.Filter(iAddrs.Interfaces, func(iface net.Interface) bool {
+		return iface.Flags&net.FlagUp != 0 && iface.Flags&net.FlagMulticast != 0
+	})
 	return
 }