feat(proxyd): high availability

proxyd/proxyd/backend.go

@@ -630,7 +630,7 @@ func (b *Backend) ErrorRate() (errorRate float64) {
 	return errorRate
 }
 
-// IsDegraded checks if the backend is serving traffic in a degraded state (i.e. used as a last resource)
+// IsDegraded checks if the backend is serving traffic in a degraded local (i.e. used as a last resource)
 func (b *Backend) IsDegraded() bool {
 	avgLatency := time.Duration(b.latencySlidingWindow.Avg())
 	return avgLatency >= b.maxDegradedLatencyThreshold
@@ -677,7 +677,7 @@ func (bg *BackendGroup) Forward(ctx context.Context, rpcReqs []*RPCReq, isBatch
 
 	if bg.Consensus != nil {
 		// When `consensus_aware` is set to `true`, the backend group acts as a load balancer
-		// serving traffic from any backend that agrees in the consensus group
+		// serving traffic update any backend that agrees in the consensus group
 		backends = bg.loadBalancedConsensusGroup()
 
 		// We also rewrite block tags to enforce compliance with consensus

proxyd/proxyd/cache.go

@@ -7,8 +7,8 @@ import (
 	"time"
 
 	"github.com/ethereum/go-ethereum/rpc"
+	"github.com/redis/go-redis/v9"
 
-	"github.com/go-redis/redis/v8"
 	"github.com/golang/snappy"
 	lru "github.com/hashicorp/golang-lru"
 )
@@ -78,7 +78,7 @@ func (c *redisCache) Get(ctx context.Context, key string) (string, error) {
 
 func (c *redisCache) Put(ctx context.Context, key string, value string) error {
 	start := time.Now()
-	err := c.rdb.SetEX(ctx, c.namespaced(key), value, redisTTL).Err()
+	err := c.rdb.SetEx(ctx, c.namespaced(key), value, redisTTL).Err()
 	redisCacheDurationSumm.WithLabelValues("SETEX").Observe(float64(time.Since(start).Milliseconds()))
 
 	if err != nil {

proxyd/proxyd/config.go

@@ -110,6 +110,10 @@ type BackendGroupConfig struct {
 	ConsensusMaxBlockLag        uint64       `toml:"consensus_max_block_lag"`
 	ConsensusMaxBlockRange      uint64       `toml:"consensus_max_block_range"`
 	ConsensusMinPeerCount       int          `toml:"consensus_min_peer_count"`
+
+	ConsensusHA                  bool         `toml:"consensus_ha"`
+	ConsensusHAHeartbeatInterval TOMLDuration `toml:"consensus_ha_heartbeat_interval"`
+	ConsensusHALockPeriod        TOMLDuration `toml:"consensus_ha_lock_period"`
 }
 
 type BackendGroupsConfig map[string]*BackendGroupConfig

proxyd/proxyd/consensus_poller.go

@@ -19,10 +19,11 @@ const (
 
 type OnConsensusBroken func()
 
-// ConsensusPoller checks the consensus state for each member of a BackendGroup
+// ConsensusPoller checks the consensus local for each member of a BackendGroup
 // resolves the highest common block for multiple nodes, and reconciles the consensus
 // in case of block hash divergence to minimize re-orgs
 type ConsensusPoller struct {
+	ctx        context.Context
 	cancelFunc context.CancelFunc
 	listeners  []OnConsensusBroken
 
@@ -220,6 +221,7 @@ func NewConsensusPoller(bg *BackendGroup, opts ...ConsensusOpt) *ConsensusPoller
 	state := make(map[*Backend]*backendState, len(bg.Backends))
 
 	cp := &ConsensusPoller{
+		ctx:          ctx,
 		cancelFunc:   cancelFunc,
 		backendGroup: bg,
 		backendState: state,
@@ -248,7 +250,7 @@ func NewConsensusPoller(bg *BackendGroup, opts ...ConsensusOpt) *ConsensusPoller
 	return cp
 }
 
-// UpdateBackend refreshes the consensus state of a single backend
+// UpdateBackend refreshes the consensus local of a single backend
 func (cp *ConsensusPoller) UpdateBackend(ctx context.Context, be *Backend) {
 	bs := cp.getBackendState(be)
 	RecordConsensusBackendBanned(be, bs.IsBanned())
@@ -258,7 +260,7 @@ func (cp *ConsensusPoller) UpdateBackend(ctx context.Context, be *Backend) {
 		return
 	}
 
-	// if backend is not healthy state we'll only resume checking it after ban
+	// if backend is not healthy local we'll only resume checking it after ban
 	if !be.IsHealthy() {
 		log.Warn("backend banned - not healthy", "backend", be.Name)
 		cp.Ban(be)
@@ -268,7 +270,7 @@ func (cp *ConsensusPoller) UpdateBackend(ctx context.Context, be *Backend) {
 	inSync, err := cp.isInSync(ctx, be)
 	RecordConsensusBackendInSync(be, err == nil && inSync)
 	if err != nil {
-		log.Warn("error updating backend sync state", "name", be.Name, "err", err)
+		log.Warn("error updating backend sync local", "name", be.Name, "err", err)
 	}
 
 	var peerCount uint64
@@ -306,7 +308,7 @@ func (cp *ConsensusPoller) UpdateBackend(ctx context.Context, be *Backend) {
 	RecordBackendFinalizedBlock(be, finalizedBlockNumber)
 
 	if changed {
-		log.Debug("backend state updated",
+		log.Debug("backend local updated",
 			"name", be.Name,
 			"peerCount", peerCount,
 			"inSync", inSync,
@@ -352,9 +354,9 @@ func (cp *ConsensusPoller) checkExpectedBlockTags(
 		currentSafe <= currentLatest
 }
 
-// UpdateBackendGroupConsensus resolves the current group consensus based on the state of the backends
+// UpdateBackendGroupConsensus resolves the current group consensus based on the local of the backends
 func (cp *ConsensusPoller) UpdateBackendGroupConsensus(ctx context.Context) {
-	// get the latest block number from the tracker
+	// get the latest block number update the tracker
 	currentConsensusBlockNumber := cp.GetLatestBlockNumber()
 
 	// get the candidates for the consensus group
@@ -472,7 +474,7 @@ func (cp *ConsensusPoller) UpdateBackendGroupConsensus(ctx context.Context) {
 	RecordGroupConsensusFilteredCount(cp.backendGroup, len(filteredBackendsNames))
 	RecordGroupTotalCount(cp.backendGroup, len(cp.backendGroup.Backends))
 
-	log.Debug("group state",
+	log.Debug("group local",
 		"proposedBlock", proposedBlock,
 		"consensusBackends", strings.Join(consensusBackendsNames, ", "),
 		"filteredBackends", strings.Join(filteredBackendsNames, ", "))
@@ -493,13 +495,13 @@ func (cp *ConsensusPoller) Ban(be *Backend) {
 	bs.backendStateMux.Lock()
 	bs.bannedUntil = time.Now().Add(cp.banPeriod)
 
-	// when we ban a node, we give it the chance to start from any block when it is back
+	// when we ban a node, we give it the chance to start update any block when it is back
 	bs.latestBlockNumber = 0
 	bs.safeBlockNumber = 0
 	bs.finalizedBlockNumber = 0
 }
 
-// Unban removes any bans from the backends
+// Unban removes any bans update the backends
 func (cp *ConsensusPoller) Unban(be *Backend) {
 	bs := cp.backendState[be]
 	defer bs.backendStateMux.Unlock()
@@ -514,7 +516,7 @@ func (cp *ConsensusPoller) Reset() {
 	}
 }
 
-// fetchBlock is a convenient wrapper to make a request to get a block directly from the backend
+// fetchBlock is a convenient wrapper to make a request to get a block directly update the backend
 func (cp *ConsensusPoller) fetchBlock(ctx context.Context, be *Backend, block string) (blockNumber hexutil.Uint64, blockHash string, err error) {
 	var rpcRes RPCRes
 	err = be.ForwardRPC(ctx, &rpcRes, "67", "eth_getBlockByNumber", block, false)
@@ -532,7 +534,7 @@ func (cp *ConsensusPoller) fetchBlock(ctx context.Context, be *Backend, block st
 	return
 }
 
-// getPeerCount is a convenient wrapper to retrieve the current peer count from the backend
+// getPeerCount is a convenient wrapper to retrieve the current peer count update the backend
 func (cp *ConsensusPoller) getPeerCount(ctx context.Context, be *Backend) (count uint64, err error) {
 	var rpcRes RPCRes
 	err = be.ForwardRPC(ctx, &rpcRes, "67", "net_peerCount")
@@ -550,7 +552,7 @@ func (cp *ConsensusPoller) getPeerCount(ctx context.Context, be *Backend) (count
 	return count, nil
 }
 
-// isInSync is a convenient wrapper to check if the backend is in sync from the network
+// isInSync is a convenient wrapper to check if the backend is in sync update the network
 func (cp *ConsensusPoller) isInSync(ctx context.Context, be *Backend) (result bool, err error) {
 	var rpcRes RPCRes
 	err = be.ForwardRPC(ctx, &rpcRes, "67", "eth_syncing")
@@ -577,7 +579,7 @@ func (cp *ConsensusPoller) isInSync(ctx context.Context, be *Backend) (result bo
 	return res, nil
 }
 
-// getBackendState creates a copy of backend state so that the caller can use it without locking
+// getBackendState creates a copy of backend local so that the caller can use it without locking
 func (cp *ConsensusPoller) getBackendState(be *Backend) *backendState {
 	bs := cp.backendState[be]
 	defer bs.backendStateMux.Unlock()
@@ -614,7 +616,7 @@ func (cp *ConsensusPoller) setBackendState(be *Backend, peerCount uint64, inSync
 }
 
 // getConsensusCandidates find out what backends are the candidates to be in the consensus group
-// and create a copy of current their state
+// and create a copy of current their local
 //
 // a candidate is a serving node within the following conditions:
 //   - not banned
@@ -668,7 +670,7 @@ func (cp *ConsensusPoller) getConsensusCandidates() map[*Backend]*backendState {
 		}
 	}
 
-	// remove lagging backends from the candidates
+	// remove lagging backends update the candidates
 	for _, be := range lagging {
 		delete(candidates, be)
 	}

proxyd/proxyd/consensus_tracker.go

@@ -2,12 +2,17 @@ package proxyd
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
+	"os"
 	"sync"
+	"time"
 
 	"github.com/ethereum/go-ethereum/common/hexutil"
-
+	"github.com/ethereum/go-ethereum/log"
-	"github.com/go-redis/redis/v8"
+	"github.com/go-redsync/redsync/v4"
+	"github.com/go-redsync/redsync/v4/redis/goredis/v9"
+	"github.com/redis/go-redis/v9"
 )
 
 // ConsensusTracker abstracts how we store and retrieve the current consensus
@@ -21,17 +26,29 @@ type ConsensusTracker interface {
 	SetFinalizedBlockNumber(blockNumber hexutil.Uint64)
 }
 
+// DTO to hold the current consensus state
+type ConsensusTrackerState struct {
+	Latest    hexutil.Uint64 `json:"latest"`
+	Safe      hexutil.Uint64 `json:"safe"`
+	Finalized hexutil.Uint64 `json:"finalized"`
+}
+
+func (s *ConsensusTrackerState) update(o *ConsensusTrackerState) {
+	s.Latest = o.Latest
+	s.Safe = o.Safe
+	s.Finalized = o.Finalized
+}
+
 // InMemoryConsensusTracker store and retrieve in memory, async-safe
 type InMemoryConsensusTracker struct {
-	latestBlockNumber    hexutil.Uint64
+	mutex sync.Mutex
-	safeBlockNumber      hexutil.Uint64
+	state *ConsensusTrackerState
-	finalizedBlockNumber hexutil.Uint64
-	mutex                sync.Mutex
 }
 
 func NewInMemoryConsensusTracker() ConsensusTracker {
 	return &InMemoryConsensusTracker{
 		mutex: sync.Mutex{},
+		state: &ConsensusTrackerState{},
 	}
 }
 
@@ -39,83 +56,252 @@ func (ct *InMemoryConsensusTracker) GetLatestBlockNumber() hexutil.Uint64 {
 	defer ct.mutex.Unlock()
 	ct.mutex.Lock()
 
-	return ct.latestBlockNumber
+	return ct.state.Latest
 }
 
 func (ct *InMemoryConsensusTracker) SetLatestBlockNumber(blockNumber hexutil.Uint64) {
 	defer ct.mutex.Unlock()
 	ct.mutex.Lock()
 
-	ct.latestBlockNumber = blockNumber
+	ct.state.Latest = blockNumber
 }
 
 func (ct *InMemoryConsensusTracker) GetSafeBlockNumber() hexutil.Uint64 {
 	defer ct.mutex.Unlock()
 	ct.mutex.Lock()
 
-	return ct.safeBlockNumber
+	return ct.state.Safe
 }
 
 func (ct *InMemoryConsensusTracker) SetSafeBlockNumber(blockNumber hexutil.Uint64) {
 	defer ct.mutex.Unlock()
 	ct.mutex.Lock()
 
-	ct.safeBlockNumber = blockNumber
+	ct.state.Safe = blockNumber
 }
 
 func (ct *InMemoryConsensusTracker) GetFinalizedBlockNumber() hexutil.Uint64 {
 	defer ct.mutex.Unlock()
 	ct.mutex.Lock()
 
-	return ct.finalizedBlockNumber
+	return ct.state.Finalized
 }
 
 func (ct *InMemoryConsensusTracker) SetFinalizedBlockNumber(blockNumber hexutil.Uint64) {
 	defer ct.mutex.Unlock()
 	ct.mutex.Lock()
 
-	ct.finalizedBlockNumber = blockNumber
+	ct.state.Finalized = blockNumber
 }
 
-// RedisConsensusTracker uses a Redis `client` to store and retrieve consensus, async-safe
+// RedisConsensusTracker store and retrieve in a shared Redis cluster, with leader election
 type RedisConsensusTracker struct {
 	ctx          context.Context
 	client       *redis.Client
-	backendGroup string
+	namespace    string
+	backendGroup *BackendGroup
+
+	redlock           *redsync.Mutex
+	lockPeriod        time.Duration
+	heartbeatInterval time.Duration
+
+	leader     bool
+	leaderName string
+
+	// holds the state collected by local pollers
+	local *InMemoryConsensusTracker
+
+	// holds a copy of the remote shared state
+	// when leader, updates the remote with the local state
+	remote *InMemoryConsensusTracker
 }
 
-func NewRedisConsensusTracker(ctx context.Context, r *redis.Client, namespace string) ConsensusTracker {
+type RedisConsensusTrackerOpt func(cp *RedisConsensusTracker)
-	return &RedisConsensusTracker{
+
+func WithLockPeriod(lockPeriod time.Duration) RedisConsensusTrackerOpt {
+	return func(ct *RedisConsensusTracker) {
+		ct.lockPeriod = lockPeriod
+	}
+}
+
+func WithHeartbeatInterval(heartbeatInterval time.Duration) RedisConsensusTrackerOpt {
+	return func(ct *RedisConsensusTracker) {
+		ct.heartbeatInterval = heartbeatInterval
+	}
+}
+func NewRedisConsensusTracker(ctx context.Context,
+	redisClient *redis.Client,
+	bg *BackendGroup,
+	namespace string,
+	opts ...RedisConsensusTrackerOpt) ConsensusTracker {
+
+	tracker := &RedisConsensusTracker{
 		ctx:          ctx,
-		client:       r,
+		client:       redisClient,
-		backendGroup: namespace,
+		backendGroup: bg,
+		namespace:    namespace,
+
+		lockPeriod:        30 * time.Second,
+		heartbeatInterval: 2 * time.Second,
+		local:             NewInMemoryConsensusTracker().(*InMemoryConsensusTracker),
+		remote:            NewInMemoryConsensusTracker().(*InMemoryConsensusTracker),
+	}
+
+	for _, opt := range opts {
+		opt(tracker)
+	}
+
+	return tracker
+}
+
+func (ct *RedisConsensusTracker) Init() {
+	go func() {
+		for {
+			// follow same context as backend group poller
+			ctx := ct.backendGroup.Consensus.ctx
+			timer := time.NewTimer(ct.heartbeatInterval)
+			ct.stateHeartbeat()
+
+			select {
+			case <-timer.C:
+			case <-ctx.Done():
+				timer.Stop()
+				return
+			}
+		}
+	}()
+}
+
+func (ct *RedisConsensusTracker) stateHeartbeat() {
+	pool := goredis.NewPool(ct.client)
+	rs := redsync.New(pool)
+	key := ct.key("mutex")
+
+	val, err := ct.client.Get(ct.ctx, key).Result()
+	if err != nil && err != redis.Nil {
+		log.Error("failed to read the mutex", "err", err)
+		ct.leader = false
+		return
+	}
+	if val != "" {
+		if ct.leader {
+			log.Debug("extending lock")
+			ok, err := ct.redlock.Extend()
+			if err != nil || !ok {
+				log.Error("failed to extend lock", "err", err, "mutex", ct.redlock.Name(), "val", ct.redlock.Value())
+				ct.leader = false
+				return
+			}
+			ct.postPayload(val)
+		} else {
+			// retrieve current leader
+			leaderName, err := ct.client.Get(ct.ctx, ct.key(fmt.Sprintf("leader:%s", val))).Result()
+			if err != nil && err != redis.Nil {
+				log.Error("failed to read the remote leader", "err", err)
+				return
+			}
+			ct.leaderName = leaderName
+			log.Debug("following", "val", val, "leader", leaderName)
+			// retrieve payload
+			val, err := ct.client.Get(ct.ctx, ct.key(fmt.Sprintf("state:%s", val))).Result()
+			if err != nil && err != redis.Nil {
+				log.Error("failed to read the remote state", "err", err)
+				return
+			}
+			if val == "" {
+				log.Error("remote state is missing (recent leader election maybe?)")
+				return
+			}
+			state := &ConsensusTrackerState{}
+			err = json.Unmarshal([]byte(val), state)
+			if err != nil {
+				log.Error("failed to unmarshal the remote state", "err", err)
+				return
+			}
+			ct.remote.mutex.Lock()
+			defer ct.remote.mutex.Unlock()
+			ct.remote.state.update(state)
+			log.Debug("updated state from remote", "state", val, "leader", leaderName)
+		}
+	} else {
+		if ct.local.GetLatestBlockNumber() == 0 ||
+			ct.local.GetSafeBlockNumber() == 0 ||
+			ct.local.GetFinalizedBlockNumber() == 0 {
+			log.Warn("lock not found, but local state is missing, skipping")
+			return
+		}
+		log.Info("lock not found, creating a new one")
+
+		mutex := rs.NewMutex(key,
+			redsync.WithExpiry(ct.lockPeriod),
+			redsync.WithFailFast(true),
+			redsync.WithTries(1))
+
+		if err := mutex.Lock(); err != nil {
+			log.Debug("failed to obtain lock", "err", err)
+			ct.leader = false
+			return
+		}
+
+		log.Info("lock acquired", "mutex", mutex.Name(), "val", mutex.Value())
+		ct.redlock = mutex
+		ct.leader = true
+		ct.postPayload(mutex.Value())
 	}
 }
 
 func (ct *RedisConsensusTracker) key(tag string) string {
-	return fmt.Sprintf("consensus:%s:%s", ct.backendGroup, tag)
+	return fmt.Sprintf("consensus:%s:%s", ct.namespace, tag)
 }
 
 func (ct *RedisConsensusTracker) GetLatestBlockNumber() hexutil.Uint64 {
-	return hexutil.Uint64(hexutil.MustDecodeUint64(ct.client.Get(ct.ctx, ct.key("latest")).Val()))
+	return ct.remote.GetLatestBlockNumber()
 }
 
 func (ct *RedisConsensusTracker) SetLatestBlockNumber(blockNumber hexutil.Uint64) {
-	ct.client.Set(ct.ctx, ct.key("latest"), blockNumber, 0)
+	ct.local.SetLatestBlockNumber(blockNumber)
 }
 
 func (ct *RedisConsensusTracker) GetSafeBlockNumber() hexutil.Uint64 {
-	return hexutil.Uint64(hexutil.MustDecodeUint64(ct.client.Get(ct.ctx, ct.key("safe")).Val()))
+	return ct.remote.GetSafeBlockNumber()
 }
 
 func (ct *RedisConsensusTracker) SetSafeBlockNumber(blockNumber hexutil.Uint64) {
-	ct.client.Set(ct.ctx, ct.key("safe"), blockNumber, 0)
+	ct.local.SetSafeBlockNumber(blockNumber)
 }
 
 func (ct *RedisConsensusTracker) GetFinalizedBlockNumber() hexutil.Uint64 {
-	return hexutil.Uint64(hexutil.MustDecodeUint64(ct.client.Get(ct.ctx, ct.key("finalized")).Val()))
+	return ct.remote.GetFinalizedBlockNumber()
 }
 
 func (ct *RedisConsensusTracker) SetFinalizedBlockNumber(blockNumber hexutil.Uint64) {
-	ct.client.Set(ct.ctx, ct.key("finalized"), blockNumber, 0)
+	ct.local.SetFinalizedBlockNumber(blockNumber)
+}
+
+func (ct *RedisConsensusTracker) postPayload(mutexVal string) {
+	ct.remote.mutex.Lock()
+	defer ct.remote.mutex.Unlock()
+
+	jsonState, err := json.Marshal(ct.local.state)
+	if err != nil {
+		log.Error("failed to marshal local", "err", err)
+		ct.leader = false
+		return
+	}
+	ct.client.Set(ct.ctx, ct.key(fmt.Sprintf("state:%s", mutexVal)), jsonState, ct.lockPeriod)
+
+	leader, _ := os.LookupEnv("HOSTNAME")
+	if leader == "" {
+
+	}
+	ct.client.Set(ct.ctx, ct.key(fmt.Sprintf("leader:%s", mutexVal)), leader, ct.lockPeriod)
+
+	log.Debug("posted state", "state", string(jsonState), "leader", leader)
+
+	ct.leaderName = leader
+	ct.remote.state.update(ct.local.state)
+
+	RecordGroupConsensusHALatestBlock(ct.backendGroup, leader, ct.local.state.Latest)
+	RecordGroupConsensusHASafeBlock(ct.backendGroup, leader, ct.local.state.Safe)
+	RecordGroupConsensusHAFinalizedBlock(ct.backendGroup, leader, ct.local.state.Finalized)
 }

proxyd/proxyd/frontend_rate_limiter.go

@@ -6,7 +6,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/go-redis/redis/v8"
+	"github.com/redis/go-redis/v9"
 )
 
 type FrontendRateLimiter interface {

proxyd/proxyd/frontend_rate_limiter_test.go

@@ -7,7 +7,7 @@ import (
 	"time"
 
 	"github.com/alicebob/miniredis"
-	"github.com/go-redis/redis/v8"
+	"github.com/redis/go-redis/v9"
 	"github.com/stretchr/testify/require"
 )
 

proxyd/proxyd/go.mod

@@ -7,7 +7,6 @@ require (
 	github.com/alicebob/miniredis v2.5.0+incompatible
 	github.com/emirpasic/gods v1.18.1
 	github.com/ethereum/go-ethereum v1.12.1
-	github.com/go-redis/redis/v8 v8.11.4
 	github.com/golang/snappy v0.0.5-0.20220116011046-fa5810519dcb
 	github.com/gorilla/mux v1.8.0
 	github.com/gorilla/websocket v1.5.0
@@ -44,11 +43,14 @@ require (
 	github.com/ethereum/c-kzg-4844 v0.3.0 // indirect
 	github.com/getsentry/sentry-go v0.18.0 // indirect
 	github.com/go-ole/go-ole v1.2.6 // indirect
+	github.com/go-redsync/redsync/v4 v4.9.4 // indirect
 	github.com/go-stack/stack v1.8.1 // indirect
 	github.com/gofrs/flock v0.8.1 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/gomodule/redigo v1.8.8 // indirect
+	github.com/gomodule/redigo v1.8.9 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/holiman/bloomfilter/v2 v2.0.3 // indirect
 	github.com/holiman/uint256 v1.2.3 // indirect
 	github.com/klauspost/compress v1.15.15 // indirect
@@ -62,6 +64,7 @@ require (
 	github.com/prometheus/client_model v0.3.0 // indirect
 	github.com/prometheus/common v0.39.0 // indirect
 	github.com/prometheus/procfs v0.9.0 // indirect
+	github.com/redis/go-redis/v9 v9.1.0 // indirect
 	github.com/rivo/uniseg v0.2.0 // indirect
 	github.com/rogpeppe/go-internal v1.9.0 // indirect
 	github.com/shirou/gopsutil v3.21.11+incompatible // indirect

proxyd/proxyd/go.sum

@@ -25,6 +25,8 @@ github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/bits-and-blooms/bitset v1.7.0 h1:YjAGVd3XmtK9ktAbX8Zg2g2PwLIMjGREZJHlV4j7NEo=
 github.com/bits-and-blooms/bitset v1.7.0/go.mod h1:gIdJ4wp64HaoK2YrL1Q5/N7Y16edYb8uY+O0FJTyyDA=
+github.com/bsm/ginkgo/v2 v2.5.0/go.mod h1:AiKlXPm7ItEHNc/2+OkrNG4E0ITzojb9/xWzvQ9XZ9w=
+github.com/bsm/gomega v1.20.0/go.mod h1:JifAceMQ4crZIWYUKrlGcmbN3bqHogVTADMD2ATsbwk=
 github.com/btcsuite/btcd v0.20.1-beta/go.mod h1:wVuoA8VJLEcwgqHBwHmzLRazpKxTv13Px/pDuV7OomQ=
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@@ -114,11 +116,17 @@ github.com/gin-gonic/gin v1.4.0/go.mod h1:OW2EZn3DO8Ln9oIKOvM++LBO+5UPHJJDH72/q/
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@@ -136,6 +144,7 @@ github.com/gogo/status v1.1.0/go.mod h1:BFv9nrluPLmrS0EmGVvLaPNmRosr9KapBYd5/hpY
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@@ -156,6 +165,8 @@ github.com/golang/snappy v0.0.5-0.20220116011046-fa5810519dcb/go.mod h1:/XxbfmMg
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@@ -163,9 +174,12 @@ github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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@@ -174,6 +188,11 @@ github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB7
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@@ -184,6 +203,7 @@ github.com/holiman/uint256 v1.2.3 h1:K8UWO1HUJpRMXBxbmaY1Y8IAMZC/RsKB+ArEnnK4l5o
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@@ -257,21 +277,43 @@ github.com/nats-io/nuid v1.0.1/go.mod h1:19wcPz3Ph3q0Jbyiqsd0kePYG7A95tJPxeL+1OS
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@@ -290,6 +332,9 @@ github.com/prometheus/common v0.39.0 h1:oOyhkDq05hPZKItWVBkJ6g6AtGxi+fy7F4JvUV8u
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@@ -298,6 +343,7 @@ github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZV
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@@ -325,6 +371,7 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
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 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
+github.com/stvp/tempredis v0.0.0-20181119212430-b82af8480203/go.mod h1:oqN97ltKNihBbwlX8dLpwxCl3+HnXKV/R0e+sRLd9C8=
 github.com/supranational/blst v0.3.11 h1:LyU6FolezeWAhvQk0k6O/d49jqgO52MSDDfYgbeoEm4=
 github.com/supranational/blst v0.3.11/go.mod h1:jZJtfjgudtNl4en1tzwPIV3KjUnQUvG3/j+w+fVonLw=
 github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7 h1:epCh84lMvA70Z7CTTCmYQn2CKbY8j86K7/FAIr141uY=
@@ -354,10 +401,18 @@ github.com/yudai/pp v2.0.1+incompatible/go.mod h1:PuxR/8QJ7cyCkFp/aUDS+JY727OFEZ
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
+github.com/yuin/goldmark v1.4.1/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
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 github.com/yuin/gopher-lua v0.0.0-20210529063254-f4c35e4016d9 h1:k/gmLsJDWwWqbLCur2yWnJzwQEKRcAHXo6seXGuSwWw=
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 github.com/yusufpapurcu/wmi v1.2.2 h1:KBNDSne4vP5mbSWnJbO+51IMOXJB67QiYCSBrubbPRg=
 github.com/yusufpapurcu/wmi v1.2.2/go.mod h1:SBZ9tNy3G9/m5Oi98Zks0QjeHVDvuK0qfxQmPyzfmi0=
+go.opentelemetry.io/otel v1.12.0/go.mod h1:geaoz0L0r1BEOR81k7/n9W4TCXYCJ7bPO7K374jQHG0=
+go.opentelemetry.io/otel/metric v0.35.0/go.mod h1:qAcbhaTRFU6uG8QM7dDo7XvFsWcugziq/5YI065TokQ=
+go.opentelemetry.io/otel/sdk v1.12.0/go.mod h1:WYcvtgquYvgODEvxOry5owO2y9MyciW7JqMz6cpXShE=
+go.opentelemetry.io/otel/sdk/metric v0.35.0/go.mod h1:eDyp1GxSiwV98kr7w4pzrszQh/eze9MqBqPd2bCPmyE=
+go.opentelemetry.io/otel/trace v1.12.0/go.mod h1:pHlgBynn6s25qJ2szD+Bv+iwKJttjHSI3lUAyf0GNuQ=
+go.uber.org/goleak v1.2.0/go.mod h1:XJYK+MuIchqpmGmUSAzotztawfKvYLUIgg7guXrwVUo=
 golang.org/x/crypto v0.0.0-20170930174604-9419663f5a44/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
@@ -369,6 +424,7 @@ golang.org/x/crypto v0.0.0-20200510223506-06a226fb4e37/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.1.0/go.mod h1:RecgLatLF4+eUMCP1PoPZQb+cVrJcOPbHkTkbkB9sbw=
 golang.org/x/crypto v0.9.0 h1:LF6fAI+IutBocDJ2OT0Q1g8plpYljMZ4+lty+dsqw3g=
 golang.org/x/crypto v0.9.0/go.mod h1:yrmDGqONDYtNj3tH8X9dzUun2m2lzPa9ngI6/RUPGR0=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
@@ -377,11 +433,16 @@ golang.org/x/exp v0.0.0-20230515195305-f3d0a9c9a5cc/go.mod h1:V1LtkGg67GoY2N1AnL
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
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 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
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+golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3/go.mod h1:3p9vT2HGsQu2K1YbXdKPJLVgG5VJdoTa1poYQBtP1AY=
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+golang.org/x/mod v0.6.0/go.mod h1:4mET923SAdbXp2ki8ey+zGs1SLqsuM2Y0uvdZR/fUNI=
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@@ -394,6 +455,7 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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 golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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 golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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@@ -403,6 +465,14 @@ golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
 golang.org/x/net v0.0.0-20211008194852-3b03d305991f/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
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+golang.org/x/net v0.5.0/go.mod h1:DivGGAXEgPSlEBzxGzZI+ZLohi+xUj054jfeKui00ws=
 golang.org/x/net v0.10.0 h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -413,6 +483,8 @@ golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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 golang.org/x/sync v0.3.0 h1:ftCYgMx6zT/asHUrPw8BLLscYtGznsLAnjq5RH9P66E=
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@@ -427,7 +499,9 @@ golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -444,18 +518,37 @@ golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBc
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 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.5.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.6.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.9.0 h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=
 golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/time v0.0.0-20201208040808-7e3f01d25324/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -472,7 +565,14 @@ golang.org/x/tools v0.0.0-20200130002326-2f3ba24bd6e7/go.mod h1:TB2adYChydJhpapK
 golang.org/x/tools v0.0.0-20200619180055-7c47624df98f/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
+golang.org/x/tools v0.1.1/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.3/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
+golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
+golang.org/x/tools v0.1.10/go.mod h1:Uh6Zz+xoGYZom868N8YTex3t7RhtHDBrE8Gzo9bV56E=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.2.0/go.mod h1:y4OqIKeOV/fWJetJ8bXPU1sEVniLMIyDAZWeHdV+NTA=
+golang.org/x/tools v0.4.0/go.mod h1:UE5sM2OK9E/d67R0ANs2xJizIymRP5gJU295PvKXxjQ=
+golang.org/x/tools v0.5.0/go.mod h1:N+Kgy78s5I24c24dU8OfWNEotWjutIs8SnJvn5IDq+k=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -501,6 +601,7 @@ google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpAD
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
 google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

proxyd/proxyd/methods.go

@@ -44,7 +44,7 @@ func (e *StaticMethodHandler) GetRPCMethod(ctx context.Context, req *RPCReq) (*R
 	key := e.key(req)
 	val, err := e.cache.Get(ctx, key)
 	if err != nil {
-		log.Error("error reading from cache", "key", key, "method", req.Method, "err", err)
+		log.Error("error reading update cache", "key", key, "method", req.Method, "err", err)
 		return nil, err
 	}
 	if val == "" {
@@ -53,7 +53,7 @@ func (e *StaticMethodHandler) GetRPCMethod(ctx context.Context, req *RPCReq) (*R
 
 	var result interface{}
 	if err := json.Unmarshal([]byte(val), &result); err != nil {
-		log.Error("error unmarshalling value from cache", "key", key, "method", req.Method, "err", err)
+		log.Error("error unmarshalling value update cache", "key", key, "method", req.Method, "err", err)
 		return nil, err
 	}
 	return &RPCRes{

proxyd/proxyd/metrics.go

@@ -262,6 +262,33 @@ var (
 		"backend_group_name",
 	})
 
+	consensusHALatestBlock = promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Namespace: MetricsNamespace,
+		Name:      "group_consensus_ha_latest_block",
+		Help:      "Consensus HA latest block",
+	}, []string{
+		"backend_group_name",
+		"leader",
+	})
+
+	consensusHASafeBlock = promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Namespace: MetricsNamespace,
+		Name:      "group_consensus_ha_safe_block",
+		Help:      "Consensus HA safe block",
+	}, []string{
+		"backend_group_name",
+		"leader",
+	})
+
+	consensusHAFinalizedBlock = promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Namespace: MetricsNamespace,
+		Name:      "group_consensus_ha_finalized_block",
+		Help:      "Consensus HA finalized block",
+	}, []string{
+		"backend_group_name",
+		"leader",
+	})
+
 	backendLatestBlockBackend = promauto.NewGaugeVec(prometheus.GaugeOpts{
 		Namespace: MetricsNamespace,
 		Name:      "backend_latest_block",
@@ -305,7 +332,7 @@ var (
 	consensusGroupFilteredCount = promauto.NewGaugeVec(prometheus.GaugeOpts{
 		Namespace: MetricsNamespace,
 		Name:      "group_consensus_filtered_count",
-		Help:      "Consensus group filtered out from serving traffic count",
+		Help:      "Consensus group filtered out update serving traffic count",
 	}, []string{
 		"backend_group_name",
 	})
@@ -438,6 +465,18 @@ func RecordBatchSize(size int) {
 	batchSizeHistogram.Observe(float64(size))
 }
 
+func RecordGroupConsensusHALatestBlock(group *BackendGroup, leader string, blockNumber hexutil.Uint64) {
+	consensusHALatestBlock.WithLabelValues(group.Name, leader).Set(float64(blockNumber))
+}
+
+func RecordGroupConsensusHASafeBlock(group *BackendGroup, leader string, blockNumber hexutil.Uint64) {
+	consensusHASafeBlock.WithLabelValues(group.Name, leader).Set(float64(blockNumber))
+}
+
+func RecordGroupConsensusHAFinalizedBlock(group *BackendGroup, leader string, blockNumber hexutil.Uint64) {
+	consensusHAFinalizedBlock.WithLabelValues(group.Name, leader).Set(float64(blockNumber))
+}
+
 func RecordGroupConsensusLatestBlock(group *BackendGroup, blockNumber hexutil.Uint64) {
 	consensusLatestBlock.WithLabelValues(group.Name).Set(float64(blockNumber))
 }

proxyd/proxyd/proxyd.go

@@ -1,6 +1,7 @@
 package proxyd
 
 import (
+	"context"
 	"crypto/tls"
 	"errors"
 	"fmt"
@@ -10,8 +11,8 @@ import (
 
 	"github.com/ethereum/go-ethereum/common/math"
 	"github.com/ethereum/go-ethereum/log"
-	"github.com/go-redis/redis/v8"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"github.com/redis/go-redis/v9"
 	"golang.org/x/sync/semaphore"
 )
 
@@ -313,8 +314,28 @@ func Start(config *Config) (*Server, func(), error) {
 				copts = append(copts, WithMaxBlockRange(bgcfg.ConsensusMaxBlockRange))
 			}
 
+			var tracker ConsensusTracker
+			if bgcfg.ConsensusHA {
+				if redisClient == nil {
+					log.Crit("cant start - consensus high availability requires redis")
+				}
+				topts := make([]RedisConsensusTrackerOpt, 0)
+				if bgcfg.ConsensusHALockPeriod > 0 {
+					topts = append(topts, WithLockPeriod(time.Duration(bgcfg.ConsensusHALockPeriod)))
+				}
+				if bgcfg.ConsensusHAHeartbeatInterval > 0 {
+					topts = append(topts, WithLockPeriod(time.Duration(bgcfg.ConsensusHAHeartbeatInterval)))
+				}
+				tracker = NewRedisConsensusTracker(context.Background(), redisClient, bg, bg.Name, topts...)
+				copts = append(copts, WithTracker(tracker))
+			}
+
 			cp := NewConsensusPoller(bg, copts...)
 			bg.Consensus = cp
+
+			if bgcfg.ConsensusHA {
+				tracker.(*RedisConsensusTracker).Init()
+			}
 		}
 	}
 

proxyd/proxyd/redis.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"time"
 
-	"github.com/go-redis/redis/v8"
+	"github.com/redis/go-redis/v9"
 )
 
 func NewRedisClient(url string) (*redis.Client, error) {

proxyd/proxyd/server.go

@@ -22,10 +22,10 @@ import (
 	"github.com/ethereum/go-ethereum/core/txpool"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/log"
-	"github.com/go-redis/redis/v8"
 	"github.com/gorilla/mux"
 	"github.com/gorilla/websocket"
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/redis/go-redis/v9"
 	"github.com/rs/cors"
 	"github.com/syndtr/goleveldb/leveldb/opt"
 )
@@ -653,11 +653,11 @@ func (s *Server) rateLimitSender(ctx context.Context, req *RPCReq) error {
 	var data hexutil.Bytes
 	if err := data.UnmarshalText([]byte(params[0])); err != nil {
 		log.Debug("error decoding raw tx data", "err", err, "req_id", GetReqID(ctx))
-		// Geth returns the raw error from UnmarshalText.
+		// Geth returns the raw error update UnmarshalText.
 		return ErrInvalidParams(err.Error())
 	}
 
-	// Inflates a types.Transaction object from the transaction's raw bytes.
+	// Inflates a types.Transaction object update the transaction's raw bytes.
 	tx := new(types.Transaction)
 	if err := tx.UnmarshalBinary(data); err != nil {
 		log.Debug("could not unmarshal transaction", "err", err, "req_id", GetReqID(ctx))
@@ -675,12 +675,12 @@ func (s *Server) rateLimitSender(ctx context.Context, req *RPCReq) error {
 	// sender. This method performs an ecrecover, which can be expensive.
 	msg, err := core.TransactionToMessage(tx, types.LatestSignerForChainID(tx.ChainId()), nil)
 	if err != nil {
-		log.Debug("could not get message from transaction", "err", err, "req_id", GetReqID(ctx))
+		log.Debug("could not get message update transaction", "err", err, "req_id", GetReqID(ctx))
 		return ErrInvalidParams(err.Error())
 	}
 	ok, err := s.senderLim.Take(ctx, fmt.Sprintf("%s:%d", msg.From.Hex(), tx.Nonce()))
 	if err != nil {
-		log.Error("error taking from sender limiter", "err", err, "req_id", GetReqID(ctx))
+		log.Error("error taking update sender limiter", "err", err, "req_id", GetReqID(ctx))
 		return ErrInternal
 	}
 	if !ok {