Fixing an issue where packets are dropped each time

we change wg configuration

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/akamensky/argparse v1.4.0
 	github.com/automerge/automerge-go v0.0.0-20230903201930-b80ce8aadbb9
 	github.com/google/uuid v1.3.0
+	github.com/jmespath/go-jmespath v0.4.0
 	github.com/sirupsen/logrus v1.9.3
 	golang.zx2c4.com/wireguard/wgctrl v0.0.0-20230429144221-925a1e7659e6
 	google.golang.org/grpc v1.58.1
@@ -16,7 +17,6 @@ require (
 require (
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/google/go-cmp v0.5.9 // indirect
-	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/josharian/native v1.1.0 // indirect
 	github.com/mdlayher/genetlink v1.3.2 // indirect
 	github.com/mdlayher/netlink v1.7.2 // indirect

pkg/lib/conv.go

@@ -1,9 +1,5 @@
 package lib
 
-import (
-	logging "github.com/tim-beatham/wgmesh/pkg/log"
-)
-
 // MapToSlice converts a map to a slice in go
 func MapValues[K comparable, V any](m map[K]V) []V {
 	return MapValuesWithExclude(m, map[K]struct{}{})
@@ -23,8 +19,6 @@ func MapValuesWithExclude[K comparable, V any](m map[K]V, exclude map[K]struct{}
 			continue
 		}
 
-		logging.Log.WriteInfof("Key %s", k)
-
 		values[i] = v
 		i++
 	}

pkg/mesh/config.go

@@ -16,7 +16,7 @@ type WgMeshConfigApplyer struct {
 	meshManager *MeshManager
 }
 
-func ConvertMeshNode(node MeshNode) (*wgtypes.PeerConfig, error) {
+func convertMeshNode(node MeshNode) (*wgtypes.PeerConfig, error) {
 	endpoint, err := net.ResolveUDPAddr("udp", node.GetWgEndpoint())
 
 	if err != nil {
@@ -59,7 +59,7 @@ func (m *WgMeshConfigApplyer) updateWgConf(mesh MeshProvider) error {
 	var count int = 0
 
 	for _, n := range nodes {
-		peer, err := ConvertMeshNode(n)
+		peer, err := convertMeshNode(n)
 
 		if err != nil {
 			return err
@@ -70,8 +70,7 @@ func (m *WgMeshConfigApplyer) updateWgConf(mesh MeshProvider) error {
 	}
 
 	cfg := wgtypes.Config{
-		Peers:        peerConfigs,
-		ReplacePeers: true,
+		Peers: peerConfigs,
 	}
 
 	dev, err := mesh.GetDevice()

pkg/mesh/manager.go

@@ -218,6 +218,10 @@ func (s *MeshManager) GetSelf(meshId string) (MeshNode, error) {
 	return node, nil
 }
 
+func (s *MeshManager) ApplyConfig() error {
+	return s.configApplyer.ApplyConfig()
+}
+
 // UpdateTimeStamp updates the timestamp of this node in all meshes
 func (s *MeshManager) UpdateTimeStamp() error {
 	for _, mesh := range s.Meshes {

pkg/sync/syncer.go

@@ -21,13 +21,18 @@ type SyncerImpl struct {
 	manager            *mesh.MeshManager
 	requester          SyncRequester
 	authenticatedNodes []crdt.MeshNodeCrdt
+	infectionCount     int
 }
 
 const subSetLength = 3
+const infectionCount = 3
 
 // Sync: Sync random nodes
 func (s *SyncerImpl) Sync(meshId string) error {
-	if !s.manager.HasChanges(meshId) {
+	logging.Log.WriteInfof("UPDATING WG CONF")
+	s.manager.ApplyConfig()
+
+	if !s.manager.HasChanges(meshId) && s.infectionCount == 0 {
 		logging.Log.WriteInfof("No changes for %s", meshId)
 		return nil
 	}
@@ -76,6 +81,9 @@ func (s *SyncerImpl) Sync(meshId string) error {
 	waitGroup.Wait()
 
 	logging.Log.WriteInfof("SYNC TIME: %v", time.Now().Sub(before))
+
+	s.infectionCount = ((infectionCount + s.infectionCount - 1) % infectionCount)
+
 	return nil
 }
 
@@ -93,5 +101,5 @@ func (s *SyncerImpl) SyncMeshes() error {
 }
 
 func NewSyncer(m *mesh.MeshManager, r SyncRequester) Syncer {
-	return &SyncerImpl{manager: m, requester: r}
+	return &SyncerImpl{manager: m, requester: r, infectionCount: 0}
 }

pkg/wg/wg.go

@@ -1,6 +1,7 @@
 package wg
 
 import (
+	"errors"
 	"fmt"
 	"net"
 	"os/exec"
@@ -75,19 +76,29 @@ func flushInterface(ifName string) error {
 // EnableInterface flushes the interface and sets the ip address of the
 // interface
 func (m *WgInterfaceManipulatorImpl) EnableInterface(ifName string, ip string) error {
+	if len(ifName) == 0 {
+		return errors.New("ifName not provided")
+	}
+
 	err := flushInterface(ifName)
 
 	if err != nil {
 		return err
 	}
 
+	cmd := exec.Command("/usr/bin/ip", "link", "set", "up", "dev", ifName)
+
+	if err := cmd.Run(); err != nil {
+		return err
+	}
+
 	hostIp, _, err := net.ParseCIDR(ip)
 
 	if err != nil {
 		return err
 	}
 
-	cmd := exec.Command("/usr/bin/ip", "addr", "add", hostIp.String()+"/64", "dev", ifName)
+	cmd = exec.Command("/usr/bin/ip", "addr", "add", hostIp.String()+"/64", "dev", ifName)
 
 	if err := cmd.Run(); err != nil {
 		return err