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state_syncer.go
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state_syncer.go
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// Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package syncer
import (
"context"
"fmt"
"math"
"go.uber.org/zap"
"github.com/ava-labs/avalanchego/database"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/proto/pb/p2p"
"github.com/ava-labs/avalanchego/snow"
"github.com/ava-labs/avalanchego/snow/engine/common"
"github.com/ava-labs/avalanchego/snow/engine/snowman/block"
"github.com/ava-labs/avalanchego/snow/validators"
"github.com/ava-labs/avalanchego/utils/logging"
"github.com/ava-labs/avalanchego/utils/set"
"github.com/ava-labs/avalanchego/version"
safemath "github.com/ava-labs/avalanchego/utils/math"
)
// maxOutstandingBroadcastRequests is the maximum number of requests to have
// outstanding when broadcasting.
const maxOutstandingBroadcastRequests = 50
var _ common.StateSyncer = (*stateSyncer)(nil)
// summary content as received from network, along with accumulated weight.
type weightedSummary struct {
summary block.StateSummary
weight uint64
}
type stateSyncer struct {
Config
// list of NoOpsHandler for messages dropped by state syncer
common.AcceptedFrontierHandler
common.AcceptedHandler
common.AncestorsHandler
common.PutHandler
common.QueryHandler
common.ChitsHandler
common.AppHandler
started bool
// Tracks the last requestID that was used in a request
requestID uint32
stateSyncVM block.StateSyncableVM
onDoneStateSyncing func(ctx context.Context, lastReqID uint32) error
// we track the (possibly nil) local summary to help engine
// choosing among multiple validated summaries
locallyAvailableSummary block.StateSummary
// Holds the beacons that were sampled for the accepted frontier
// Won't be consumed as seeders are reached out. Used to rescale
// alpha for frontiers
frontierSeeders validators.Manager
// IDs of validators we should request state summary frontier from.
// Will be consumed seeders are reached out for frontier.
targetSeeders set.Set[ids.NodeID]
// IDs of validators we requested a state summary frontier from
// but haven't received a reply yet. ID is cleared if/when reply arrives.
pendingSeeders set.Set[ids.NodeID]
// IDs of validators that failed to respond with their state summary frontier
failedSeeders set.Set[ids.NodeID]
// IDs of validators we should request filtering the accepted state summaries from
targetVoters set.Set[ids.NodeID]
// IDs of validators we requested filtering the accepted state summaries from
// but haven't received a reply yet. ID is cleared if/when reply arrives.
pendingVoters set.Set[ids.NodeID]
// IDs of validators that failed to respond with their filtered accepted state summaries
failedVoters set.Set[ids.NodeID]
// summaryID --> (summary, weight)
weightedSummaries map[ids.ID]*weightedSummary
// summaries received may be different even if referring to the same height
// we keep a list of deduplicated height ready for voting
summariesHeights set.Set[uint64]
uniqueSummariesHeights []uint64
}
func New(
cfg Config,
onDoneStateSyncing func(ctx context.Context, lastReqID uint32) error,
) common.StateSyncer {
ssVM, _ := cfg.VM.(block.StateSyncableVM)
return &stateSyncer{
Config: cfg,
AcceptedFrontierHandler: common.NewNoOpAcceptedFrontierHandler(cfg.Ctx.Log),
AcceptedHandler: common.NewNoOpAcceptedHandler(cfg.Ctx.Log),
AncestorsHandler: common.NewNoOpAncestorsHandler(cfg.Ctx.Log),
PutHandler: common.NewNoOpPutHandler(cfg.Ctx.Log),
QueryHandler: common.NewNoOpQueryHandler(cfg.Ctx.Log),
ChitsHandler: common.NewNoOpChitsHandler(cfg.Ctx.Log),
AppHandler: cfg.VM,
stateSyncVM: ssVM,
onDoneStateSyncing: onDoneStateSyncing,
}
}
func (ss *stateSyncer) Context() *snow.ConsensusContext {
return ss.Ctx
}
func (ss *stateSyncer) Start(ctx context.Context, startReqID uint32) error {
ss.Ctx.Log.Info("starting state sync")
ss.Ctx.State.Set(snow.EngineState{
Type: p2p.EngineType_ENGINE_TYPE_SNOWMAN,
State: snow.StateSyncing,
})
if err := ss.VM.SetState(ctx, snow.StateSyncing); err != nil {
return fmt.Errorf("failed to notify VM that state syncing has started: %w", err)
}
ss.requestID = startReqID
return ss.tryStartSyncing(ctx)
}
func (ss *stateSyncer) Connected(ctx context.Context, nodeID ids.NodeID, nodeVersion *version.Application) error {
if err := ss.VM.Connected(ctx, nodeID, nodeVersion); err != nil {
return err
}
if err := ss.StartupTracker.Connected(ctx, nodeID, nodeVersion); err != nil {
return err
}
return ss.tryStartSyncing(ctx)
}
func (ss *stateSyncer) Disconnected(ctx context.Context, nodeID ids.NodeID) error {
if err := ss.VM.Disconnected(ctx, nodeID); err != nil {
return err
}
return ss.StartupTracker.Disconnected(ctx, nodeID)
}
// tryStartSyncing will start syncing the first time it is called while the
// startupTracker is reporting that the protocol should start.
func (ss *stateSyncer) tryStartSyncing(ctx context.Context) error {
if ss.started || !ss.StartupTracker.ShouldStart() {
return nil
}
ss.started = true
return ss.startup(ctx)
}
func (ss *stateSyncer) StateSummaryFrontier(ctx context.Context, nodeID ids.NodeID, requestID uint32, summaryBytes []byte) error {
// ignores any late responses
if requestID != ss.requestID {
ss.Ctx.Log.Debug("received out-of-sync StateSummaryFrontier message",
zap.Stringer("nodeID", nodeID),
zap.Uint32("expectedRequestID", ss.requestID),
zap.Uint32("requestID", requestID),
)
return nil
}
if !ss.pendingSeeders.Contains(nodeID) {
ss.Ctx.Log.Debug("received unexpected StateSummaryFrontier message",
zap.Stringer("nodeID", nodeID),
)
return nil
}
// Mark that we received a response from [nodeID]
ss.pendingSeeders.Remove(nodeID)
// retrieve summary ID and register frontier;
// make sure next beacons are reached out
// even in case invalid summaries are received
if summary, err := ss.stateSyncVM.ParseStateSummary(ctx, summaryBytes); err == nil {
ss.weightedSummaries[summary.ID()] = &weightedSummary{
summary: summary,
}
height := summary.Height()
if !ss.summariesHeights.Contains(height) {
ss.summariesHeights.Add(height)
ss.uniqueSummariesHeights = append(ss.uniqueSummariesHeights, height)
}
} else {
if ss.Ctx.Log.Enabled(logging.Verbo) {
ss.Ctx.Log.Verbo("failed to parse summary",
zap.Binary("summary", summaryBytes),
zap.Error(err),
)
} else {
ss.Ctx.Log.Debug("failed to parse summary",
zap.Error(err),
)
}
}
return ss.receivedStateSummaryFrontier(ctx)
}
func (ss *stateSyncer) GetStateSummaryFrontierFailed(ctx context.Context, nodeID ids.NodeID, requestID uint32) error {
// ignores any late responses
if requestID != ss.requestID {
ss.Ctx.Log.Debug("received out-of-sync GetStateSummaryFrontierFailed message",
zap.Stringer("nodeID", nodeID),
zap.Uint32("expectedRequestID", ss.requestID),
zap.Uint32("requestID", requestID),
)
return nil
}
// Mark that we didn't get a response from [nodeID]
ss.failedSeeders.Add(nodeID)
ss.pendingSeeders.Remove(nodeID)
return ss.receivedStateSummaryFrontier(ctx)
}
func (ss *stateSyncer) receivedStateSummaryFrontier(ctx context.Context) error {
ss.sendGetStateSummaryFrontiers(ctx)
// still waiting on requests
if ss.pendingSeeders.Len() != 0 {
return nil
}
// All nodes reached out for the summary frontier have responded or timed out.
// If enough of them have indeed responded we'll go ahead and ask
// each state syncer (not just a sample) to filter the list of state summaries
// that we were told are on the accepted frontier.
// If we got too many timeouts, we restart state syncing hoping that network
// problems will go away and we can collect a qualified frontier.
// We assume the frontier is qualified after an alpha proportion of frontier seeders have responded
frontiersTotalWeight, err := ss.frontierSeeders.TotalWeight(ss.Ctx.SubnetID)
if err != nil {
return fmt.Errorf("failed to get total weight of frontier seeders for subnet %s: %w", ss.Ctx.SubnetID, err)
}
beaconsTotalWeight, err := ss.StateSyncBeacons.TotalWeight(ss.Ctx.SubnetID)
if err != nil {
return fmt.Errorf("failed to get total weight of state sync beacons for subnet %s: %w", ss.Ctx.SubnetID, err)
}
frontierAlpha := float64(frontiersTotalWeight*ss.Alpha) / float64(beaconsTotalWeight)
failedBeaconWeight, err := ss.StateSyncBeacons.SubsetWeight(ss.Ctx.SubnetID, ss.failedSeeders)
if err != nil {
return fmt.Errorf("failed to get total weight of failed beacons: %w", err)
}
frontierStake := frontiersTotalWeight - failedBeaconWeight
if float64(frontierStake) < frontierAlpha {
ss.Ctx.Log.Debug("restarting state sync",
zap.String("reason", "didn't receive enough frontiers"),
zap.Int("numFailedValidators", ss.failedSeeders.Len()),
)
return ss.startup(ctx)
}
ss.requestID++
ss.sendGetAcceptedStateSummaries(ctx)
return nil
}
func (ss *stateSyncer) AcceptedStateSummary(ctx context.Context, nodeID ids.NodeID, requestID uint32, summaryIDs set.Set[ids.ID]) error {
// ignores any late responses
if requestID != ss.requestID {
ss.Ctx.Log.Debug("received out-of-sync AcceptedStateSummary message",
zap.Stringer("nodeID", nodeID),
zap.Uint32("expectedRequestID", ss.requestID),
zap.Uint32("requestID", requestID),
)
return nil
}
if !ss.pendingVoters.Contains(nodeID) {
ss.Ctx.Log.Debug("received unexpected AcceptedStateSummary message",
zap.Stringer("nodeID", nodeID),
)
return nil
}
// Mark that we received a response from [nodeID]
ss.pendingVoters.Remove(nodeID)
nodeWeight := ss.StateSyncBeacons.GetWeight(ss.Ctx.SubnetID, nodeID)
ss.Ctx.Log.Debug("adding weight to summaries",
zap.Stringer("nodeID", nodeID),
zap.Stringer("subnetID", ss.Ctx.SubnetID),
zap.Reflect("summaryIDs", summaryIDs),
zap.Uint64("nodeWeight", nodeWeight),
)
for summaryID := range summaryIDs {
ws, ok := ss.weightedSummaries[summaryID]
if !ok {
ss.Ctx.Log.Debug("skipping summary",
zap.String("reason", "unknown summary"),
zap.Stringer("nodeID", nodeID),
zap.Stringer("summaryID", summaryID),
)
continue
}
newWeight, err := safemath.Add64(nodeWeight, ws.weight)
if err != nil {
ss.Ctx.Log.Error("failed to calculate new summary weight",
zap.Stringer("nodeID", nodeID),
zap.Stringer("summaryID", summaryID),
zap.Uint64("height", ws.summary.Height()),
zap.Uint64("nodeWeight", nodeWeight),
zap.Uint64("previousWeight", ws.weight),
zap.Error(err),
)
newWeight = math.MaxUint64
}
ss.Ctx.Log.Verbo("updating summary weight",
zap.Stringer("nodeID", nodeID),
zap.Stringer("summaryID", summaryID),
zap.Uint64("height", ws.summary.Height()),
zap.Uint64("previousWeight", ws.weight),
zap.Uint64("newWeight", newWeight),
)
ws.weight = newWeight
}
ss.sendGetAcceptedStateSummaries(ctx)
// wait on pending responses
if ss.pendingVoters.Len() != 0 {
return nil
}
// We've received the filtered accepted frontier from every state sync validator
// Drop all summaries without a sufficient weight behind them
for summaryID, ws := range ss.weightedSummaries {
if ws.weight < ss.Alpha {
ss.Ctx.Log.Debug("removing summary",
zap.String("reason", "insufficient weight"),
zap.Stringer("summaryID", summaryID),
zap.Uint64("height", ws.summary.Height()),
zap.Uint64("currentWeight", ws.weight),
zap.Uint64("requiredWeight", ss.Alpha),
)
delete(ss.weightedSummaries, summaryID)
}
}
// if we don't have enough weight for the state summary to be accepted then retry or fail the state sync
size := len(ss.weightedSummaries)
if size == 0 {
// retry the state sync if the weight is not enough to state sync
failedVotersWeight, err := ss.StateSyncBeacons.SubsetWeight(ss.Ctx.SubnetID, ss.failedVoters)
if err != nil {
return fmt.Errorf("failed to get total weight of failed voters: %w", err)
}
// if we had too many timeouts when asking for validator votes, we should restart
// state sync hoping for the network problems to go away; otherwise, we received
// enough (>= ss.Alpha) responses, but no state summary was supported by a majority
// of validators (i.e. votes are split between minorities supporting different state
// summaries), so there is no point in retrying state sync; we should move ahead to bootstrapping
beaconsTotalWeight, err := ss.StateSyncBeacons.TotalWeight(ss.Ctx.SubnetID)
if err != nil {
return fmt.Errorf("failed to get total weight of state sync beacons for subnet %s: %w", ss.Ctx.SubnetID, err)
}
votingStakes := beaconsTotalWeight - failedVotersWeight
if votingStakes < ss.Alpha {
ss.Ctx.Log.Debug("restarting state sync",
zap.String("reason", "not enough votes received"),
zap.Int("numBeacons", ss.StateSyncBeacons.Count(ss.Ctx.SubnetID)),
zap.Int("numFailedSyncers", ss.failedVoters.Len()),
)
return ss.startup(ctx)
}
ss.Ctx.Log.Info("skipping state sync",
zap.String("reason", "no acceptable summaries found"),
)
// if we do not restart state sync, move on to bootstrapping.
return ss.onDoneStateSyncing(ctx, ss.requestID)
}
preferredStateSummary := ss.selectSyncableStateSummary()
syncMode, err := preferredStateSummary.Accept(ctx)
if err != nil {
return err
}
ss.Ctx.Log.Info("accepted state summary",
zap.Stringer("summaryID", preferredStateSummary.ID()),
zap.Stringer("syncMode", syncMode),
zap.Int("numTotalSummaries", size),
)
switch syncMode {
case block.StateSyncSkipped:
// VM did not accept the summary, move on to bootstrapping.
return ss.onDoneStateSyncing(ctx, ss.requestID)
case block.StateSyncStatic:
// Summary was accepted and VM is state syncing.
// Engine will wait for notification of state sync done.
ss.Ctx.StateSyncing.Set(true)
return nil
case block.StateSyncDynamic:
// Summary was accepted and VM is state syncing.
// Engine will continue into bootstrapping and the VM will sync in the
// background.
ss.Ctx.StateSyncing.Set(true)
return ss.onDoneStateSyncing(ctx, ss.requestID)
default:
ss.Ctx.Log.Warn("unhandled state summary mode, proceeding to bootstrap",
zap.Stringer("syncMode", syncMode),
)
return ss.onDoneStateSyncing(ctx, ss.requestID)
}
}
// selectSyncableStateSummary chooses a state summary from all
// the network validated summaries.
func (ss *stateSyncer) selectSyncableStateSummary() block.StateSummary {
var (
maxSummaryHeight uint64
preferredStateSummary block.StateSummary
)
// by default pick highest summary, unless locallyAvailableSummary is still valid.
// In such case we pick locallyAvailableSummary to allow VM resuming state syncing.
for id, ws := range ss.weightedSummaries {
if ss.locallyAvailableSummary != nil && id == ss.locallyAvailableSummary.ID() {
return ss.locallyAvailableSummary
}
height := ws.summary.Height()
if maxSummaryHeight <= height {
maxSummaryHeight = height
preferredStateSummary = ws.summary
}
}
return preferredStateSummary
}
func (ss *stateSyncer) GetAcceptedStateSummaryFailed(ctx context.Context, nodeID ids.NodeID, requestID uint32) error {
// ignores any late responses
if requestID != ss.requestID {
ss.Ctx.Log.Debug("received out-of-sync GetAcceptedStateSummaryFailed message",
zap.Stringer("nodeID", nodeID),
zap.Uint32("expectedRequestID", ss.requestID),
zap.Uint32("requestID", requestID),
)
return nil
}
// If we can't get a response from [nodeID], act as though they said that
// they think none of the containers we sent them in GetAccepted are
// accepted
ss.failedVoters.Add(nodeID)
return ss.AcceptedStateSummary(ctx, nodeID, requestID, nil)
}
// startup do start the whole state sync process by
// sampling frontier seeders, listing state syncers to request votes to
// and reaching out frontier seeders if any. Otherwise, it moves immediately
// to bootstrapping. Unlike Start, startup does not check
// whether sufficient stake amount is connected.
func (ss *stateSyncer) startup(ctx context.Context) error {
ss.Config.Ctx.Log.Info("starting state sync")
// clear up messages trackers
ss.weightedSummaries = make(map[ids.ID]*weightedSummary)
ss.summariesHeights.Clear()
ss.uniqueSummariesHeights = nil
ss.targetSeeders.Clear()
ss.pendingSeeders.Clear()
ss.failedSeeders.Clear()
ss.targetVoters.Clear()
ss.pendingVoters.Clear()
ss.failedVoters.Clear()
// sample K beacons to retrieve frontier from
beaconIDs, err := ss.StateSyncBeacons.Sample(ss.Ctx.SubnetID, ss.Config.SampleK)
if err != nil {
return err
}
ss.frontierSeeders = validators.NewManager()
for _, nodeID := range beaconIDs {
if _, ok := ss.frontierSeeders.GetValidator(ss.Ctx.SubnetID, nodeID); !ok {
// Invariant: We never use the TxID or BLS keys populated here.
err = ss.frontierSeeders.AddStaker(ss.Ctx.SubnetID, nodeID, nil, ids.Empty, 1)
} else {
err = ss.frontierSeeders.AddWeight(ss.Ctx.SubnetID, nodeID, 1)
}
if err != nil {
return err
}
ss.targetSeeders.Add(nodeID)
}
// list all beacons, to reach them for voting on frontier
ss.targetVoters.Add(ss.StateSyncBeacons.GetValidatorIDs(ss.Ctx.SubnetID)...)
// check if there is an ongoing state sync; if so add its state summary
// to the frontier to request votes on
// Note: database.ErrNotFound means there is no ongoing summary
localSummary, err := ss.stateSyncVM.GetOngoingSyncStateSummary(ctx)
switch err {
case database.ErrNotFound:
// no action needed
case nil:
ss.locallyAvailableSummary = localSummary
ss.weightedSummaries[localSummary.ID()] = &weightedSummary{
summary: localSummary,
}
height := localSummary.Height()
ss.summariesHeights.Add(height)
ss.uniqueSummariesHeights = append(ss.uniqueSummariesHeights, height)
default:
return err
}
// initiate messages exchange
if ss.targetSeeders.Len() == 0 {
ss.Ctx.Log.Info("State syncing skipped due to no provided syncers")
return ss.onDoneStateSyncing(ctx, ss.requestID)
}
ss.requestID++
ss.sendGetStateSummaryFrontiers(ctx)
return nil
}
// Ask up to [common.MaxOutstandingBroadcastRequests] state sync validators at a time
// to send their accepted state summary. It is called again until there are
// no more seeders to be reached in the pending set
func (ss *stateSyncer) sendGetStateSummaryFrontiers(ctx context.Context) {
vdrs := set.NewSet[ids.NodeID](1)
for ss.targetSeeders.Len() > 0 && ss.pendingSeeders.Len() < maxOutstandingBroadcastRequests {
vdr, _ := ss.targetSeeders.Pop()
vdrs.Add(vdr)
ss.pendingSeeders.Add(vdr)
}
if vdrs.Len() > 0 {
ss.Sender.SendGetStateSummaryFrontier(ctx, vdrs, ss.requestID)
}
}
// Ask up to [common.MaxOutstandingStateSyncRequests] syncers validators to send
// their filtered accepted frontier. It is called again until there are
// no more voters to be reached in the pending set.
func (ss *stateSyncer) sendGetAcceptedStateSummaries(ctx context.Context) {
vdrs := set.NewSet[ids.NodeID](1)
for ss.targetVoters.Len() > 0 && ss.pendingVoters.Len() < maxOutstandingBroadcastRequests {
vdr, _ := ss.targetVoters.Pop()
vdrs.Add(vdr)
ss.pendingVoters.Add(vdr)
}
if len(vdrs) > 0 {
ss.Sender.SendGetAcceptedStateSummary(ctx, vdrs, ss.requestID, ss.uniqueSummariesHeights)
ss.Ctx.Log.Debug("sent GetAcceptedStateSummary messages",
zap.Int("numSent", vdrs.Len()),
zap.Int("numPending", ss.targetVoters.Len()),
)
}
}
func (ss *stateSyncer) Notify(ctx context.Context, msg common.Message) error {
if msg != common.StateSyncDone {
ss.Ctx.Log.Warn("received an unexpected message from the VM",
zap.Stringer("msg", msg),
)
return nil
}
ss.Ctx.StateSyncing.Set(false)
return ss.onDoneStateSyncing(ctx, ss.requestID)
}
func (*stateSyncer) Gossip(context.Context) error {
return nil
}
func (ss *stateSyncer) Shutdown(ctx context.Context) error {
ss.Config.Ctx.Log.Info("shutting down state syncer")
ss.Ctx.Lock.Lock()
defer ss.Ctx.Lock.Unlock()
return ss.VM.Shutdown(ctx)
}
func (*stateSyncer) Halt(context.Context) {}
func (*stateSyncer) Timeout(context.Context) error {
return nil
}
func (ss *stateSyncer) HealthCheck(ctx context.Context) (interface{}, error) {
ss.Ctx.Lock.Lock()
defer ss.Ctx.Lock.Unlock()
vmIntf, vmErr := ss.VM.HealthCheck(ctx)
intf := map[string]interface{}{
"consensus": struct{}{},
"vm": vmIntf,
}
return intf, vmErr
}
func (ss *stateSyncer) IsEnabled(ctx context.Context) (bool, error) {
if ss.stateSyncVM == nil {
// state sync is not implemented
return false, nil
}
ss.Ctx.Lock.Lock()
defer ss.Ctx.Lock.Unlock()
return ss.stateSyncVM.StateSyncEnabled(ctx)
}