Merge pull request #46 from tim-beatham/45-use-statistical-testing

45 use statistical testing

cmd/wgmeshd/main.go

@@ -63,8 +63,7 @@ func main() {
 	syncRequester = sync.NewSyncRequester(ctrlServer)
 	syncer = sync.NewSyncer(ctrlServer.MeshManager, conf, syncRequester)
 	syncScheduler := sync.NewSyncScheduler(ctrlServer, syncRequester, syncer)
-	timestampScheduler := timer.NewTimestampScheduler(ctrlServer)
+	keepAlive := timer.NewTimestampScheduler(ctrlServer)
-	pruneScheduler := mesh.NewPruner(ctrlServer.MeshManager, *conf)
 
 	robinIpcParams := robin.RobinIpcParams{
 		CtrlServer: ctrlServer,
@@ -82,13 +81,12 @@ func main() {
 
 	go ipc.RunIpcHandler(&robinIpc)
 	go syncScheduler.Run()
-	go timestampScheduler.Run()
+	go keepAlive.Run()
-	go pruneScheduler.Run()
 
 	closeResources := func() {
 		logging.Log.WriteInfof("Closing resources")
 		syncScheduler.Stop()
-		timestampScheduler.Stop()
+		keepAlive.Stop()
 		ctrlServer.Close()
 		client.Close()
 	}

pkg/automerge/automerge.go

@@ -477,54 +477,54 @@ func (m *CrdtMeshManager) GetSyncer() mesh.MeshSyncer {
 	return NewAutomergeSync(m)
 }
 
-func (m *CrdtMeshManager) Prune(pruneTime int) error {
+func (m *CrdtMeshManager) Prune() error {
-	nodes, err := m.doc.Path("nodes").Get()
+	// nodes, err := m.doc.Path("nodes").Get()
 
-	if err != nil {
+	// if err != nil {
-		return err
+	// 	return err
-	}
+	// }
 
-	if nodes.Kind() != automerge.KindMap {
+	// if nodes.Kind() != automerge.KindMap {
-		return errors.New("node must be a map")
+	// 	return errors.New("node must be a map")
-	}
+	// }
 
-	values, err := nodes.Map().Values()
+	// values, err := nodes.Map().Values()
 
-	if err != nil {
+	// if err != nil {
-		return err
+	// 	return err
-	}
+	// }
 
-	deletionNodes := make([]string, 0)
+	// deletionNodes := make([]string, 0)
 
-	for nodeId, node := range values {
+	// for nodeId, node := range values {
-		if node.Kind() != automerge.KindMap {
+	// 	if node.Kind() != automerge.KindMap {
-			return errors.New("node must be a map")
+	// 		return errors.New("node must be a map")
-		}
+	// 	}
 
-		nodeMap := node.Map()
+	// 	nodeMap := node.Map()
 
-		timeStamp, err := nodeMap.Get("timestamp")
+	// 	timeStamp, err := nodeMap.Get("timestamp")
 
-		if err != nil {
+	// 	if err != nil {
-			return err
+	// 		return err
-		}
+	// 	}
 
-		if timeStamp.Kind() != automerge.KindInt64 {
+	// 	if timeStamp.Kind() != automerge.KindInt64 {
-			return errors.New("timestamp is not int64")
+	// 		return errors.New("timestamp is not int64")
-		}
+	// 	}
 
-		timeValue := timeStamp.Int64()
+	// 	timeValue := timeStamp.Int64()
-		nowValue := time.Now().Unix()
+	// 	nowValue := time.Now().Unix()
 
-		if nowValue-timeValue >= int64(pruneTime) {
+	// 	if nowValue-timeValue >= int64(pruneTime) {
-			deletionNodes = append(deletionNodes, nodeId)
+	// 		deletionNodes = append(deletionNodes, nodeId)
-		}
+	// 	}
-	}
+	// }
 
-	for _, node := range deletionNodes {
+	// for _, node := range deletionNodes {
-		logging.Log.WriteInfof("Pruning %s", node)
+	// 	logging.Log.WriteInfof("Pruning %s", node)
-		nodes.Map().Delete(node)
+	// 	nodes.Map().Delete(node)
-	}
+	// }
 
 	return nil
 }

pkg/crdt/datastore.go

@@ -5,6 +5,7 @@ import (
 	"encoding/gob"
 	"fmt"
 	"net"
+	"slices"
 	"strings"
 	"time"
 
@@ -245,6 +246,31 @@ func (m *TwoPhaseStoreMeshManager) UpdateTimeStamp(nodeId string) error {
 		return fmt.Errorf("datastore: %s does not exist in the mesh", nodeId)
 	}
 
+	// Sort nodes by their public key
+	peers := m.GetPeers()
+	slices.Sort(peers)
+
+	if len(peers) == 0 {
+		return nil
+	}
+
+	peerToUpdate := peers[0]
+
+	if uint64(time.Now().Unix())-m.store.Clock.GetTimestamp(peerToUpdate) > 3*uint64(m.conf.KeepAliveTime) {
+		m.store.Mark(peerToUpdate)
+
+		if len(peers) < 2 {
+			return nil
+		}
+
+		peerToUpdate = peers[1]
+	}
+
+	if peerToUpdate != nodeId {
+		return nil
+	}
+
+	// Refresh causing node to update it's time stamp
 	node := m.store.Get(nodeId)
 	node.Timestamp = time.Now().Unix()
 	m.store.Put(nodeId, node)
@@ -375,18 +401,8 @@ func (m *TwoPhaseStoreMeshManager) RemoveService(nodeId string, key string) erro
 }
 
 // Prune: prunes all nodes that have not updated their timestamp in
-// pruneAmount of seconds
+func (m *TwoPhaseStoreMeshManager) Prune() error {
-func (m *TwoPhaseStoreMeshManager) Prune(pruneAmount int) error {
+	m.store.Prune()
-	nodes := lib.MapValues(m.store.AsMap())
-	nodes = lib.Filter(nodes, func(mn MeshNode) bool {
-		return time.Now().Unix()-mn.Timestamp > int64(pruneAmount)
-	})
-
-	for _, node := range nodes {
-		key, _ := node.GetPublicKey()
-		m.store.Remove(key.String())
-	}
-
 	return nil
 }
 
@@ -405,7 +421,7 @@ func (m *TwoPhaseStoreMeshManager) GetPeers() []string {
 			return false
 		}
 
-		return time.Now().Unix()-mn.Timestamp < int64(m.conf.DeadTime)
+		return true
 	})
 
 	return lib.Map(nodes, func(mn MeshNode) string {

pkg/crdt/factory.go

@@ -2,6 +2,7 @@ package crdt
 
 import (
 	"fmt"
+	"hash/fnv"
 
 	"github.com/tim-beatham/wgmesh/pkg/conf"
 	"github.com/tim-beatham/wgmesh/pkg/lib"
@@ -16,7 +17,11 @@ func (f *TwoPhaseMapFactory) CreateMesh(params *mesh.MeshProviderFactoryParams)
 		IfName: params.DevName,
 		Client: params.Client,
 		conf:   params.Conf,
-		store:  NewTwoPhaseMap[string, MeshNode](params.NodeID),
+		store: NewTwoPhaseMap[string, MeshNode](params.NodeID, func(s string) uint64 {
+			h := fnv.New32a()
+			h.Write([]byte(s))
+			return uint64(h.Sum32())
+		}, uint64(3*params.Conf.KeepAliveTime)),
 	}, nil
 }
 

pkg/crdt/g_map.go

@@ -2,6 +2,7 @@
 package crdt
 
 import (
+	"cmp"
 	"sync"
 )
 
@@ -12,16 +13,16 @@ type Bucket[D any] struct {
 }
 
 // GMap is a set that can only grow in size
-type GMap[K comparable, D any] struct {
+type GMap[K cmp.Ordered, D any] struct {
 	lock     sync.RWMutex
 	contents map[K]Bucket[D]
-	getClock func() uint64
+	clock    *VectorClock[K]
 }
 
 func (g *GMap[K, D]) Put(key K, value D) {
 	g.lock.Lock()
 
-	clock := g.getClock() + 1
+	clock := g.clock.IncrementClock()
 
 	g.contents[key] = Bucket[D]{
 		Vector:   clock,
@@ -67,6 +68,7 @@ func (g *GMap[K, D]) Mark(key K) {
 	g.lock.Lock()
 	bucket := g.contents[key]
 	bucket.Gravestone = true
+	g.contents[key] = bucket
 	g.lock.Unlock()
 }
 
@@ -138,9 +140,33 @@ func (g *GMap[K, D]) GetClock() map[K]uint64 {
 	return clock
 }
 
-func NewGMap[K comparable, D any](getClock func() uint64) *GMap[K, D] {
+func (g *GMap[K, D]) GetHash() uint64 {
+	hash := uint64(0)
+
+	g.lock.RLock()
+
+	for _, value := range g.contents {
+		hash += value.Vector
+	}
+
+	g.lock.RUnlock()
+	return hash
+}
+
+func (g *GMap[K, D]) Prune() {
+	stale := g.clock.getStale()
+	g.lock.Lock()
+
+	for _, outlier := range stale {
+		delete(g.contents, outlier)
+	}
+
+	g.lock.Unlock()
+}
+
+func NewGMap[K cmp.Ordered, D any](clock *VectorClock[K]) *GMap[K, D] {
 	return &GMap[K, D]{
 		contents: make(map[K]Bucket[D]),
-		getClock: getClock,
+		clock:    clock,
 	}
 }

pkg/crdt/two_phase_map.go

@@ -1,20 +1,19 @@
 package crdt
 
 import (
-	"sync"
+	"cmp"
 
 	"github.com/tim-beatham/wgmesh/pkg/lib"
 )
 
-type TwoPhaseMap[K comparable, D any] struct {
+type TwoPhaseMap[K cmp.Ordered, D any] struct {
 	addMap    *GMap[K, D]
 	removeMap *GMap[K, bool]
-	vectors   map[K]uint64
+	Clock     *VectorClock[K]
 	processId K
-	lock      sync.RWMutex
 }
 
-type TwoPhaseMapSnapshot[K comparable, D any] struct {
+type TwoPhaseMapSnapshot[K cmp.Ordered, D any] struct {
 	Add    map[K]Bucket[D]
 	Remove map[K]Bucket[bool]
 }
@@ -48,15 +47,8 @@ func (m *TwoPhaseMap[K, D]) Get(key K) D {
 
 // Put places the key K in the map
 func (m *TwoPhaseMap[K, D]) Put(key K, data D) {
-	msgSequence := m.incrementClock()
+	msgSequence := m.Clock.IncrementClock()
-
+	m.Clock.Put(key, msgSequence)
-	m.lock.Lock()
-
-	if _, ok := m.vectors[key]; !ok {
-		m.vectors[key] = msgSequence
-	}
-
-	m.lock.Unlock()
 	m.addMap.Put(key, data)
 }
 
@@ -114,7 +106,8 @@ func (m *TwoPhaseMap[K, D]) SnapShotFromState(state *TwoPhaseMapState[K]) *TwoPh
 	}
 }
 
-type TwoPhaseMapState[K comparable] struct {
+type TwoPhaseMapState[K cmp.Ordered] struct {
+	Vectors        map[K]uint64
 	AddContents    map[K]uint64
 	RemoveContents map[K]uint64
 }
@@ -123,32 +116,11 @@ func (m *TwoPhaseMap[K, D]) IsMarked(key K) bool {
 	return m.addMap.IsMarked(key)
 }
 
-func (m *TwoPhaseMap[K, D]) incrementClock() uint64 {
-	maxClock := uint64(0)
-	m.lock.Lock()
-
-	for _, value := range m.vectors {
-		maxClock = max(maxClock, value)
-	}
-
-	m.vectors[m.processId] = maxClock + 1
-	m.lock.Unlock()
-	return maxClock
-}
-
 // GetHash: Get the hash of the current state of the map
 // Sums the current values of the vectors. Provides good approximation
 // of increasing numbers
 func (m *TwoPhaseMap[K, D]) GetHash() uint64 {
-	m.lock.RLock()
+	return m.addMap.GetHash() + m.removeMap.GetHash()
-
-	sum := lib.Reduce(uint64(0), lib.MapValues(m.vectors), func(sum uint64, current uint64) uint64 {
-		return current + sum
-	})
-
-	m.lock.RUnlock()
-
-	return sum
 }
 
 // GetState: get the current vector clock of the add and remove
@@ -158,11 +130,18 @@ func (m *TwoPhaseMap[K, D]) GenerateMessage() *TwoPhaseMapState[K] {
 	removeContents := m.removeMap.GetClock()
 
 	return &TwoPhaseMapState[K]{
+		Vectors:        m.Clock.GetClock(),
 		AddContents:    addContents,
 		RemoveContents: removeContents,
 	}
 }
 
+func (m *TwoPhaseMap[K, D]) UpdateVector(state *TwoPhaseMapState[K]) {
+	for key, value := range state.Vectors {
+		m.Clock.Put(key, value)
+	}
+}
+
 func (m *TwoPhaseMapState[K]) Difference(state *TwoPhaseMapState[K]) *TwoPhaseMapState[K] {
 	mapState := &TwoPhaseMapState[K]{
 		AddContents:    make(map[K]uint64),
@@ -177,7 +156,7 @@ func (m *TwoPhaseMapState[K]) Difference(state *TwoPhaseMapState[K]) *TwoPhaseMa
 		}
 	}
 
-	for key, value := range state.AddContents {
+	for key, value := range state.RemoveContents {
 		otherValue, ok := m.RemoveContents[key]
 
 		if !ok || otherValue < value {
@@ -189,35 +168,35 @@ func (m *TwoPhaseMapState[K]) Difference(state *TwoPhaseMapState[K]) *TwoPhaseMa
 }
 
 func (m *TwoPhaseMap[K, D]) Merge(snapshot TwoPhaseMapSnapshot[K, D]) {
-	m.lock.Lock()
-
 	for key, value := range snapshot.Add {
 		// Gravestone is local only to that node.
 		// Discover ourselves if the node is alive
-		value.Gravestone = false
 		m.addMap.put(key, value)
-		m.vectors[key] = max(value.Vector, m.vectors[key])
+		m.Clock.Put(key, value.Vector)
 	}
 
 	for key, value := range snapshot.Remove {
-		value.Gravestone = false
 		m.removeMap.put(key, value)
-		m.vectors[key] = max(value.Vector, m.vectors[key])
+		m.Clock.Put(key, value.Vector)
 	}
+}
 
-	m.lock.Unlock()
+func (m *TwoPhaseMap[K, D]) Prune() {
+	m.addMap.Prune()
+	m.removeMap.Prune()
+	m.Clock.Prune()
 }
 
 // NewTwoPhaseMap: create a new two phase map. Consists of two maps
 // a grow map and a remove map. If both timestamps equal then favour keeping
 // it in the map
-func NewTwoPhaseMap[K comparable, D any](processId K) *TwoPhaseMap[K, D] {
+func NewTwoPhaseMap[K cmp.Ordered, D any](processId K, hashKey func(K) uint64, staleTime uint64) *TwoPhaseMap[K, D] {
 	m := TwoPhaseMap[K, D]{
-		vectors:   make(map[K]uint64),
 		processId: processId,
+		Clock:     NewVectorClock(processId, hashKey, staleTime),
 	}
 
-	m.addMap = NewGMap[K, D](m.incrementClock)
+	m.addMap = NewGMap[K, D](m.Clock)
-	m.removeMap = NewGMap[K, bool](m.incrementClock)
+	m.removeMap = NewGMap[K, bool](m.Clock)
 	return &m
 }

pkg/crdt/two_phase_map_syncer.go

@@ -10,7 +10,8 @@ import (
 type SyncState int
 
 const (
-	PREPARE SyncState = iota
+	HASH SyncState = iota
+	PREPARE
 	PRESENT
 	EXCHANGE
 	MERGE
@@ -26,13 +27,51 @@ type TwoPhaseSyncer struct {
 	peerMsg            []byte
 }
 
+type TwoPhaseHash struct {
+	Hash uint64
+}
+
 type SyncFSM map[SyncState]func(*TwoPhaseSyncer) ([]byte, bool)
 
-func prepare(syncer *TwoPhaseSyncer) ([]byte, bool) {
+func hash(syncer *TwoPhaseSyncer) ([]byte, bool) {
+	hash := TwoPhaseHash{
+		Hash: syncer.manager.store.Clock.GetHash(),
+	}
+
 	var buffer bytes.Buffer
 	enc := gob.NewEncoder(&buffer)
 
-	err := enc.Encode(*syncer.mapState)
+	err := enc.Encode(hash)
+
+	if err != nil {
+		logging.Log.WriteInfof(err.Error())
+	}
+
+	syncer.IncrementState()
+	return buffer.Bytes(), true
+}
+
+func prepare(syncer *TwoPhaseSyncer) ([]byte, bool) {
+	var recvBuffer = bytes.NewBuffer(syncer.peerMsg)
+	dec := gob.NewDecoder(recvBuffer)
+
+	var hash TwoPhaseHash
+	err := dec.Decode(&hash)
+
+	if err != nil {
+		logging.Log.WriteInfof(err.Error())
+	}
+
+	// If vector clocks are equal then no need to merge state
+	// Helps to reduce bandwidth by detecting early
+	if hash.Hash == syncer.manager.store.Clock.GetHash() {
+		return nil, false
+	}
+
+	var buffer bytes.Buffer
+	enc := gob.NewEncoder(&buffer)
+
+	err = enc.Encode(*syncer.mapState)
 
 	if err != nil {
 		logging.Log.WriteInfof(err.Error())
@@ -100,7 +139,6 @@ func merge(syncer *TwoPhaseSyncer) ([]byte, bool) {
 	dec.Decode(&snapshot)
 
 	syncer.manager.store.Merge(snapshot)
-
 	return nil, false
 }
 
@@ -125,10 +163,14 @@ func (t *TwoPhaseSyncer) RecvMessage(msg []byte) error {
 
 func (t *TwoPhaseSyncer) Complete() {
 	logging.Log.WriteInfof("SYNC COMPLETED")
+	if t.state == FINISHED || t.state == MERGE {
+		t.manager.store.Clock.IncrementClock()
+	}
 }
 
 func NewTwoPhaseSyncer(manager *TwoPhaseStoreMeshManager) *TwoPhaseSyncer {
 	var generateMessageFsm SyncFSM = SyncFSM{
+		HASH:     hash,
 		PREPARE:  prepare,
 		PRESENT:  present,
 		EXCHANGE: exchange,
@@ -137,7 +179,7 @@ func NewTwoPhaseSyncer(manager *TwoPhaseStoreMeshManager) *TwoPhaseSyncer {
 
 	return &TwoPhaseSyncer{
 		manager:            manager,
-		state:              PREPARE,
+		state:              HASH,
 		mapState:           manager.store.GenerateMessage(),
 		generateMessageFSM: generateMessageFsm,
 	}

pkg/crdt/vector_clock.go

@@ -0,0 +1,147 @@
+package crdt
+
+import (
+	"cmp"
+	"slices"
+	"sync"
+	"time"
+
+	"github.com/tim-beatham/wgmesh/pkg/lib"
+)
+
+type VectorBucket struct {
+	// clock current value of the node's clock
+	clock uint64
+	// lastUpdate we've seen
+	lastUpdate uint64
+}
+
+// Vector clock defines an abstract data type
+// for a vector clock implementation
+type VectorClock[K cmp.Ordered] struct {
+	vectors   map[K]*VectorBucket
+	lock      sync.RWMutex
+	processID K
+	staleTime uint64
+	hashFunc  func(K) uint64
+}
+
+// IncrementClock: increments the node's value in the vector clock
+func (m *VectorClock[K]) IncrementClock() uint64 {
+	maxClock := uint64(0)
+	m.lock.Lock()
+
+	for _, value := range m.vectors {
+		maxClock = max(maxClock, value.clock)
+	}
+
+	newBucket := VectorBucket{
+		clock:      maxClock + 1,
+		lastUpdate: uint64(time.Now().Unix()),
+	}
+
+	m.vectors[m.processID] = &newBucket
+
+	m.lock.Unlock()
+	return maxClock
+}
+
+// GetHash: gets the hash of the vector clock used to determine if there
+// are any changes
+func (m *VectorClock[K]) GetHash() uint64 {
+	m.lock.RLock()
+
+	hash := uint64(0)
+
+	sortedKeys := lib.MapKeys(m.vectors)
+	slices.Sort(sortedKeys)
+
+	for key, bucket := range m.vectors {
+		hash += m.hashFunc(key)
+		hash += bucket.clock
+	}
+
+	m.lock.RUnlock()
+	return hash
+}
+
+// getStale: get all entries that are stale within the mesh
+func (m *VectorClock[K]) getStale() []K {
+	m.lock.RLock()
+	maxTimeStamp := lib.Reduce(0, lib.MapValues(m.vectors), func(i uint64, vb *VectorBucket) uint64 {
+		return max(i, vb.lastUpdate)
+	})
+
+	toRemove := make([]K, 0)
+
+	for key, bucket := range m.vectors {
+		if maxTimeStamp-bucket.lastUpdate > m.staleTime {
+			toRemove = append(toRemove, key)
+		}
+	}
+
+	m.lock.RUnlock()
+	return toRemove
+}
+
+func (m *VectorClock[K]) Prune() {
+	stale := m.getStale()
+
+	m.lock.Lock()
+
+	for _, key := range stale {
+		delete(m.vectors, key)
+	}
+
+	m.lock.Unlock()
+}
+
+func (m *VectorClock[K]) GetTimestamp(processId K) uint64 {
+	return m.vectors[processId].lastUpdate
+}
+
+func (m *VectorClock[K]) Put(key K, value uint64) {
+	clockValue := uint64(0)
+
+	m.lock.Lock()
+	bucket, ok := m.vectors[key]
+
+	if ok {
+		clockValue = bucket.clock
+	}
+
+	if value > clockValue {
+		newBucket := VectorBucket{
+			clock:      value,
+			lastUpdate: uint64(time.Now().Unix()),
+		}
+		m.vectors[key] = &newBucket
+	}
+
+	m.lock.Unlock()
+}
+
+func (m *VectorClock[K]) GetClock() map[K]uint64 {
+	clock := make(map[K]uint64)
+
+	m.lock.RLock()
+
+	keys := lib.MapKeys(m.vectors)
+	slices.Sort(keys)
+
+	for key, value := range clock {
+		clock[key] = value
+	}
+
+	m.lock.RUnlock()
+	return clock
+}
+
+func NewVectorClock[K cmp.Ordered](processID K, hashFunc func(K) uint64, staleTime uint64) *VectorClock[K] {
+	return &VectorClock[K]{
+		vectors:   make(map[K]*VectorBucket),
+		processID: processID,
+		staleTime: staleTime,
+		hashFunc:  hashFunc,
+	}
+}

pkg/lib/conv.go

@@ -1,11 +1,13 @@
 package lib
 
+import "cmp"
+
 // MapToSlice converts a map to a slice in go
-func MapValues[K comparable, V any](m map[K]V) []V {
+func MapValues[K cmp.Ordered, V any](m map[K]V) []V {
 	return MapValuesWithExclude(m, map[K]struct{}{})
 }
 
-func MapValuesWithExclude[K comparable, V any](m map[K]V, exclude map[K]struct{}) []V {
+func MapValuesWithExclude[K cmp.Ordered, V any](m map[K]V, exclude map[K]struct{}) []V {
 	values := make([]V, len(m)-len(exclude))
 
 	i := 0
@@ -26,7 +28,7 @@ func MapValuesWithExclude[K comparable, V any](m map[K]V, exclude map[K]struct{}
 	return values
 }
 
-func MapKeys[K comparable, V any](m map[K]V) []K {
+func MapKeys[K cmp.Ordered, V any](m map[K]V) []K {
 	values := make([]K, len(m))
 
 	i := 0

pkg/lib/stats.go

@@ -0,0 +1,40 @@
+// lib contains helper functions for the implementation
+package lib
+
+import (
+	"cmp"
+	"math"
+
+	"gonum.org/v1/gonum/stat"
+	"gonum.org/v1/gonum/stat/distuv"
+)
+
+// Modelling the distribution using a normal distribution get the count
+// of the outliers
+func GetOutliers[K cmp.Ordered](counts map[K]uint64, alpha float64) []K {
+	n := float64(len(counts))
+
+	keys := MapKeys(counts)
+	values := make([]float64, len(keys))
+
+	for index, key := range keys {
+		values[index] = float64(counts[key])
+	}
+
+	mean := stat.Mean(values, nil)
+	stdDev := stat.StdDev(values, nil)
+
+	moe := distuv.Normal{Mu: 0, Sigma: 1}.Quantile(1-alpha/2) * (stdDev / math.Sqrt(n))
+
+	lowerBound := mean - moe
+
+	var outliers []K
+
+	for i, count := range values {
+		if count < lowerBound {
+			outliers = append(outliers, keys[i])
+		}
+	}
+
+	return outliers
+}

pkg/mesh/manager.go

@@ -8,7 +8,6 @@ import (
 	"github.com/tim-beatham/wgmesh/pkg/conf"
 	"github.com/tim-beatham/wgmesh/pkg/ip"
 	"github.com/tim-beatham/wgmesh/pkg/lib"
-	logging "github.com/tim-beatham/wgmesh/pkg/log"
 	"github.com/tim-beatham/wgmesh/pkg/wg"
 	"golang.zx2c4.com/wireguard/wgctrl"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
@@ -112,7 +111,7 @@ func (m *MeshManagerImpl) GetMonitor() MeshMonitor {
 // Prune implements MeshManager.
 func (m *MeshManagerImpl) Prune() error {
 	for _, mesh := range m.Meshes {
-		err := mesh.Prune(m.conf.PruneTime)
+		err := mesh.Prune()
 
 		if err != nil {
 			return err
@@ -329,7 +328,6 @@ func (s *MeshManagerImpl) GetSelf(meshId string) (MeshNode, error) {
 		return nil, fmt.Errorf("mesh %s does not exist", meshId)
 	}
 
-	logging.Log.WriteInfof(s.HostParameters.GetPublicKey())
 	node, err := meshInstance.GetNode(s.HostParameters.GetPublicKey())
 
 	if err != nil {

pkg/mesh/stub_types.go

@@ -131,7 +131,7 @@ func (*MeshProviderStub) RemoveRoutes(nodeId string, route ...string) error {
 }
 
 // Prune implements MeshProvider.
-func (*MeshProviderStub) Prune(pruneAmount int) error {
+func (*MeshProviderStub) Prune() error {
 	return nil
 }
 

pkg/mesh/types.go

@@ -131,9 +131,9 @@ type MeshProvider interface {
 	AddService(nodeId, key, value string) error
 	// RemoveService: removes the service form the node. throws an error if the service does not exist
 	RemoveService(nodeId, key string) error
-	// Prune: prunes all nodes that have not updated their timestamp in
+	// Prune: prunes all nodes that have not updated their
-	// pruneAmount seconds
+	// vector clock
-	Prune(pruneAmount int) error
+	Prune() error
 	// GetPeers: get a list of contactable peers
 	GetPeers() []string
 	// GetRoutes(): Get all unique routes. Where the route with the least hop count is chosen
@@ -173,7 +173,7 @@ type MeshProviderFactory interface {
 // MeshNodeFactoryParams are the parameters required to construct
 // a mesh node
 type MeshNodeFactoryParams struct {
-	PublicKey *wgtypes.Key
+PublicKey *wgtypes.Key
 	NodeIP    net.IP
 	WgPort    int
 	Endpoint  string

pkg/sync/syncer.go

@@ -12,7 +12,7 @@ import (
 	"github.com/tim-beatham/wgmesh/pkg/mesh"
 )
 
-// Syncer: picks random nodes from the mesh
+// Syncer: picks random nodes from the meshs
 type Syncer interface {
 	Sync(meshId string) error
 	SyncMeshes() error
@@ -25,54 +25,63 @@ type SyncerImpl struct {
 	syncCount      int
 	cluster        conn.ConnCluster
 	conf           *conf.WgMeshConfiguration
+	lastSync       uint64
 }
 
 // Sync: Sync random nodes
 func (s *SyncerImpl) Sync(meshId string) error {
-	if !s.manager.HasChanges(meshId) && s.infectionCount == 0 {
+	self, err := s.manager.GetSelf(meshId)
+
+	if err != nil {
+		return err
+	}
+
+	s.manager.GetMesh(meshId).Prune()
+
+	if self.GetType() == conf.PEER_ROLE && !s.manager.HasChanges(meshId) && s.infectionCount == 0 {
 		logging.Log.WriteInfof("No changes for %s", meshId)
 		return nil
 	}
 
-	logging.Log.WriteInfof("UPDATING WG CONF")
+	before := time.Now()
-
 	s.manager.GetRouteManager().UpdateRoutes()
-	err := s.manager.ApplyConfig()
-
-	if err != nil {
-		logging.Log.WriteInfof("Failed to update config %w", err)
-	}
 
 	publicKey := s.manager.GetPublicKey()
 
 	logging.Log.WriteInfof(publicKey.String())
 
 	nodeNames := s.manager.GetMesh(meshId).GetPeers()
+
+	var gossipNodes []string
+
+	// Clients always pings its peer for configuration
+	if self.GetType() == conf.CLIENT_ROLE {
+		keyFunc := lib.HashString
+		bucketFunc := lib.HashString
+
+		neighbour := lib.ConsistentHash(nodeNames, publicKey.String(), keyFunc, bucketFunc)
+		gossipNodes = make([]string, 1)
+		gossipNodes[0] = neighbour
+	} else {
 		neighbours := s.cluster.GetNeighbours(nodeNames, publicKey.String())
-	randomSubset := lib.RandomSubsetOfLength(neighbours, s.conf.BranchRate)
+		gossipNodes = lib.RandomSubsetOfLength(neighbours, s.conf.BranchRate)
-
-	for _, node := range randomSubset {
-		logging.Log.WriteInfof("Random node: %s", node)
-	}
-
-	before := time.Now()
 
 		if len(nodeNames) > s.conf.ClusterSize && rand.Float64() < s.conf.InterClusterChance {
-		logging.Log.WriteInfof("Sending to random cluster")
+			gossipNodes[len(gossipNodes)-1] = s.cluster.GetInterCluster(nodeNames, publicKey.String())
-		randomSubset[len(randomSubset)-1] = s.cluster.GetInterCluster(nodeNames, publicKey.String())
+		}
 	}
 
 	var succeeded bool = false
 
 	// Do this synchronously to conserve bandwidth
-	for _, node := range randomSubset {
+	for _, node := range gossipNodes {
 		correspondingPeer := s.manager.GetNode(meshId, node)
 
 		if correspondingPeer == nil {
 			logging.Log.WriteErrorf("node %s does not exist", node)
 		}
 
-		err = s.requester.SyncMesh(meshId, correspondingPeer.GetHostEndpoint())
+		err := s.requester.SyncMesh(meshId, correspondingPeer)
 
 		if err == nil || err == io.EOF {
 			succeeded = true
@@ -96,6 +105,15 @@ func (s *SyncerImpl) Sync(meshId string) error {
 	}
 
 	s.manager.GetMesh(meshId).SaveChanges()
+	s.lastSync = uint64(time.Now().Unix())
+
+	logging.Log.WriteInfof("UPDATING WG CONF")
+	err = s.manager.ApplyConfig()
+
+	if err != nil {
+		logging.Log.WriteInfof("Failed to update config %w", err)
+	}
+
 	return nil
 }
 

pkg/sync/syncererror.go

@@ -17,31 +17,20 @@ type SyncErrorHandlerImpl struct {
 	meshManager mesh.MeshManager
 }
 
-func (s *SyncErrorHandlerImpl) incrementFailedCount(meshId string, endpoint string) bool {
+func (s *SyncErrorHandlerImpl) handleFailed(meshId string, nodeId string) bool {
 	mesh := s.meshManager.GetMesh(meshId)
-
+	mesh.Mark(nodeId)
-	if mesh == nil {
-		return false
-	}
-
-	// self, err := s.meshManager.GetSelf(meshId)
-
-	// if err != nil {
-	// return false
-	// }
-
-	// mesh.DecrementHealth(endpoint, self.GetHostEndpoint())
 	return true
 }
 
-func (s *SyncErrorHandlerImpl) Handle(meshId string, endpoint string, err error) bool {
+func (s *SyncErrorHandlerImpl) Handle(meshId string, nodeId string, err error) bool {
 	errStatus, _ := status.FromError(err)
 
 	logging.Log.WriteInfof("Handled gRPC error: %s", errStatus.Message())
 
 	switch errStatus.Code() {
 	case codes.Unavailable, codes.Unknown, codes.DeadlineExceeded, codes.Internal, codes.NotFound:
-		return s.incrementFailedCount(meshId, endpoint)
+		return s.handleFailed(meshId, nodeId)
 	}
 
 	return false

pkg/sync/syncrequester.go

@@ -15,7 +15,7 @@ import (
 // SyncRequester: coordinates the syncing of meshes
 type SyncRequester interface {
 	GetMesh(meshId string, ifName string, port int, endPoint string) error
-	SyncMesh(meshid string, endPoint string) error
+	SyncMesh(meshid string, meshNode mesh.MeshNode) error
 }
 
 type SyncRequesterImpl struct {
@@ -56,8 +56,8 @@ func (s *SyncRequesterImpl) GetMesh(meshId string, ifName string, port int, endP
 	return err
 }
 
-func (s *SyncRequesterImpl) handleErr(meshId, endpoint string, err error) error {
+func (s *SyncRequesterImpl) handleErr(meshId, pubKey string, err error) error {
-	ok := s.errorHdlr.Handle(meshId, endpoint, err)
+	ok := s.errorHdlr.Handle(meshId, pubKey, err)
 
 	if ok {
 		return nil
@@ -67,7 +67,10 @@ func (s *SyncRequesterImpl) handleErr(meshId, endpoint string, err error) error
 }
 
 // SyncMesh: Proactively send a sync request to the other mesh
-func (s *SyncRequesterImpl) SyncMesh(meshId, endpoint string) error {
+func (s *SyncRequesterImpl) SyncMesh(meshId string, meshNode mesh.MeshNode) error {
+	endpoint := meshNode.GetHostEndpoint()
+	pubKey, _ := meshNode.GetPublicKey()
+
 	peerConnection, err := s.server.ConnectionManager.GetConnection(endpoint)
 
 	if err != nil {
@@ -96,7 +99,7 @@ func (s *SyncRequesterImpl) SyncMesh(meshId, endpoint string) error {
 	err = s.syncMesh(mesh, ctx, c)
 
 	if err != nil {
-		return s.handleErr(meshId, endpoint, err)
+		return s.handleErr(meshId, pubKey.String(), err)
 	}
 
 	logging.Log.WriteInfof("Synced with node: %s meshId: %s\n", endpoint, meshId)

pkg/wg/wg.go

@@ -3,7 +3,6 @@ package wg
 import (
 	"crypto"
 	"crypto/rand"
-	"encoding/base64"
 	"fmt"
 
 	"github.com/tim-beatham/wgmesh/pkg/lib"
@@ -35,8 +34,7 @@ func (m *WgInterfaceManipulatorImpl) CreateInterface(port int, privKey *wgtypes.
 	}
 
 	md5 := crypto.MD5.New().Sum(randomBuf)
-
+	md5Str := fmt.Sprintf("wg%x", md5)[:hashLength]
-	md5Str := fmt.Sprintf("wg%s", base64.StdEncoding.EncodeToString(md5)[:hashLength])
 
 	err = rtnl.CreateLink(md5Str)