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580 lines
18 KiB
580 lines
18 KiB
package statesync
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"sync"
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"time"
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abciclient "github.com/tendermint/tendermint/abci/client"
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abci "github.com/tendermint/tendermint/abci/types"
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"github.com/tendermint/tendermint/config"
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"github.com/tendermint/tendermint/internal/p2p"
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"github.com/tendermint/tendermint/internal/proxy"
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sm "github.com/tendermint/tendermint/internal/state"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/light"
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ssproto "github.com/tendermint/tendermint/proto/tendermint/statesync"
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"github.com/tendermint/tendermint/types"
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)
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const (
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// chunkTimeout is the timeout while waiting for the next chunk from the chunk queue.
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chunkTimeout = 2 * time.Minute
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// minimumDiscoveryTime is the lowest allowable time for a
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// SyncAny discovery time.
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minimumDiscoveryTime = 5 * time.Second
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)
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var (
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// errAbort is returned by Sync() when snapshot restoration is aborted.
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errAbort = errors.New("state sync aborted")
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// errRetrySnapshot is returned by Sync() when the snapshot should be retried.
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errRetrySnapshot = errors.New("retry snapshot")
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// errRejectSnapshot is returned by Sync() when the snapshot is rejected.
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errRejectSnapshot = errors.New("snapshot was rejected")
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// errRejectFormat is returned by Sync() when the snapshot format is rejected.
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errRejectFormat = errors.New("snapshot format was rejected")
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// errRejectSender is returned by Sync() when the snapshot sender is rejected.
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errRejectSender = errors.New("snapshot sender was rejected")
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// errVerifyFailed is returned by Sync() when app hash or last height
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// verification fails.
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errVerifyFailed = errors.New("verification with app failed")
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// errTimeout is returned by Sync() when we've waited too long to receive a chunk.
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errTimeout = errors.New("timed out waiting for chunk")
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// errNoSnapshots is returned by SyncAny() if no snapshots are found and discovery is disabled.
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errNoSnapshots = errors.New("no suitable snapshots found")
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)
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// syncer runs a state sync against an ABCI app. Use either SyncAny() to automatically attempt to
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// sync all snapshots in the pool (pausing to discover new ones), or Sync() to sync a specific
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// snapshot. Snapshots and chunks are fed via AddSnapshot() and AddChunk() as appropriate.
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type syncer struct {
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logger log.Logger
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stateProvider StateProvider
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conn abciclient.Client
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snapshots *snapshotPool
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snapshotCh *p2p.Channel
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chunkCh *p2p.Channel
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tempDir string
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fetchers int32
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retryTimeout time.Duration
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mtx sync.RWMutex
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chunks *chunkQueue
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metrics *Metrics
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avgChunkTime int64
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lastSyncedSnapshotHeight int64
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processingSnapshot *snapshot
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}
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// newSyncer creates a new syncer.
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func newSyncer(
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cfg config.StateSyncConfig,
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logger log.Logger,
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conn abciclient.Client,
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stateProvider StateProvider,
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snapshotCh *p2p.Channel,
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chunkCh *p2p.Channel,
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tempDir string,
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metrics *Metrics,
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) *syncer {
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return &syncer{
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logger: logger,
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stateProvider: stateProvider,
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conn: conn,
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snapshots: newSnapshotPool(),
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snapshotCh: snapshotCh,
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chunkCh: chunkCh,
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tempDir: tempDir,
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fetchers: cfg.Fetchers,
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retryTimeout: cfg.ChunkRequestTimeout,
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metrics: metrics,
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}
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}
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// AddChunk adds a chunk to the chunk queue, if any. It returns false if the chunk has already
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// been added to the queue, or an error if there's no sync in progress.
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func (s *syncer) AddChunk(chunk *chunk) (bool, error) {
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s.mtx.RLock()
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defer s.mtx.RUnlock()
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if s.chunks == nil {
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return false, errors.New("no state sync in progress")
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}
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added, err := s.chunks.Add(chunk)
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if err != nil {
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return false, err
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}
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if added {
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s.logger.Debug("Added chunk to queue", "height", chunk.Height, "format", chunk.Format,
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"chunk", chunk.Index)
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} else {
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s.logger.Debug("Ignoring duplicate chunk in queue", "height", chunk.Height, "format", chunk.Format,
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"chunk", chunk.Index)
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}
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return added, nil
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}
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// AddSnapshot adds a snapshot to the snapshot pool. It returns true if a new, previously unseen
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// snapshot was accepted and added.
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func (s *syncer) AddSnapshot(peerID types.NodeID, snapshot *snapshot) (bool, error) {
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added, err := s.snapshots.Add(peerID, snapshot)
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if err != nil {
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return false, err
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}
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if added {
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s.metrics.TotalSnapshots.Add(1)
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s.logger.Info("Discovered new snapshot", "height", snapshot.Height, "format", snapshot.Format,
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"hash", snapshot.Hash)
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}
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return added, nil
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}
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// AddPeer adds a peer to the pool. For now we just keep it simple and send a
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// single request to discover snapshots, later we may want to do retries and stuff.
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func (s *syncer) AddPeer(ctx context.Context, peerID types.NodeID) error {
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s.logger.Debug("Requesting snapshots from peer", "peer", peerID)
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return s.snapshotCh.Send(ctx, p2p.Envelope{
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To: peerID,
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Message: &ssproto.SnapshotsRequest{},
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})
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}
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// RemovePeer removes a peer from the pool.
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func (s *syncer) RemovePeer(peerID types.NodeID) {
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s.logger.Debug("Removing peer from sync", "peer", peerID)
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s.snapshots.RemovePeer(peerID)
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}
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// SyncAny tries to sync any of the snapshots in the snapshot pool, waiting to discover further
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// snapshots if none were found and discoveryTime > 0. It returns the latest state and block commit
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// which the caller must use to bootstrap the node.
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func (s *syncer) SyncAny(
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ctx context.Context,
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discoveryTime time.Duration,
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requestSnapshots func() error,
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) (sm.State, *types.Commit, error) {
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if discoveryTime != 0 && discoveryTime < minimumDiscoveryTime {
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discoveryTime = minimumDiscoveryTime
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}
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if discoveryTime > 0 {
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if err := requestSnapshots(); err != nil {
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return sm.State{}, nil, err
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}
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s.logger.Info(fmt.Sprintf("Discovering snapshots for %v", discoveryTime))
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time.Sleep(discoveryTime)
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}
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// The app may ask us to retry a snapshot restoration, in which case we need to reuse
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// the snapshot and chunk queue from the previous loop iteration.
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var (
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snapshot *snapshot
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chunks *chunkQueue
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err error
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)
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for {
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// If not nil, we're going to retry restoration of the same snapshot.
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if snapshot == nil {
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snapshot = s.snapshots.Best()
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chunks = nil
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}
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if snapshot == nil {
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if discoveryTime == 0 {
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return sm.State{}, nil, errNoSnapshots
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}
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s.logger.Info(fmt.Sprintf("Discovering snapshots for %v", discoveryTime))
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time.Sleep(discoveryTime)
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continue
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}
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if chunks == nil {
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chunks, err = newChunkQueue(snapshot, s.tempDir)
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if err != nil {
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return sm.State{}, nil, fmt.Errorf("failed to create chunk queue: %w", err)
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}
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defer chunks.Close() // in case we forget to close it elsewhere
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}
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s.processingSnapshot = snapshot
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s.metrics.SnapshotChunkTotal.Set(float64(snapshot.Chunks))
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newState, commit, err := s.Sync(ctx, snapshot, chunks)
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switch {
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case err == nil:
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s.metrics.SnapshotHeight.Set(float64(snapshot.Height))
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s.lastSyncedSnapshotHeight = int64(snapshot.Height)
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return newState, commit, nil
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case errors.Is(err, errAbort):
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return sm.State{}, nil, err
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case errors.Is(err, errRetrySnapshot):
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chunks.RetryAll()
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s.logger.Info("Retrying snapshot", "height", snapshot.Height, "format", snapshot.Format,
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"hash", snapshot.Hash)
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continue
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case errors.Is(err, errTimeout):
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s.snapshots.Reject(snapshot)
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s.logger.Error("Timed out waiting for snapshot chunks, rejected snapshot",
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"height", snapshot.Height, "format", snapshot.Format, "hash", snapshot.Hash)
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case errors.Is(err, errRejectSnapshot):
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s.snapshots.Reject(snapshot)
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s.logger.Info("Snapshot rejected", "height", snapshot.Height, "format", snapshot.Format,
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"hash", snapshot.Hash)
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case errors.Is(err, errRejectFormat):
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s.snapshots.RejectFormat(snapshot.Format)
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s.logger.Info("Snapshot format rejected", "format", snapshot.Format)
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case errors.Is(err, errRejectSender):
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s.logger.Info("Snapshot senders rejected", "height", snapshot.Height, "format", snapshot.Format,
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"hash", snapshot.Hash)
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for _, peer := range s.snapshots.GetPeers(snapshot) {
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s.snapshots.RejectPeer(peer)
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s.logger.Info("Snapshot sender rejected", "peer", peer)
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}
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default:
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return sm.State{}, nil, fmt.Errorf("snapshot restoration failed: %w", err)
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}
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// Discard snapshot and chunks for next iteration
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err = chunks.Close()
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if err != nil {
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s.logger.Error("Failed to clean up chunk queue", "err", err)
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}
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snapshot = nil
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chunks = nil
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s.processingSnapshot = nil
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}
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}
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// Sync executes a sync for a specific snapshot, returning the latest state and block commit which
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// the caller must use to bootstrap the node.
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func (s *syncer) Sync(ctx context.Context, snapshot *snapshot, chunks *chunkQueue) (sm.State, *types.Commit, error) {
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s.mtx.Lock()
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if s.chunks != nil {
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s.mtx.Unlock()
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return sm.State{}, nil, errors.New("a state sync is already in progress")
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}
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s.chunks = chunks
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s.mtx.Unlock()
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defer func() {
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s.mtx.Lock()
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s.chunks = nil
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s.mtx.Unlock()
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}()
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hctx, hcancel := context.WithTimeout(ctx, 30*time.Second)
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defer hcancel()
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// Fetch the app hash corresponding to the snapshot
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appHash, err := s.stateProvider.AppHash(hctx, snapshot.Height)
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if err != nil {
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// check if the main context was triggered
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if ctx.Err() != nil {
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return sm.State{}, nil, ctx.Err()
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}
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// catch the case where all the light client providers have been exhausted
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if err == light.ErrNoWitnesses {
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return sm.State{}, nil,
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fmt.Errorf("failed to get app hash at height %d. No witnesses remaining", snapshot.Height)
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}
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s.logger.Info("failed to get and verify tendermint state. Dropping snapshot and trying again",
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"err", err, "height", snapshot.Height)
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return sm.State{}, nil, errRejectSnapshot
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}
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snapshot.trustedAppHash = appHash
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// Offer snapshot to ABCI app.
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err = s.offerSnapshot(ctx, snapshot)
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if err != nil {
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return sm.State{}, nil, err
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}
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// Spawn chunk fetchers. They will terminate when the chunk queue is closed or context canceled.
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fetchCtx, cancel := context.WithCancel(ctx)
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defer cancel()
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fetchStartTime := time.Now()
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for i := int32(0); i < s.fetchers; i++ {
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go s.fetchChunks(fetchCtx, snapshot, chunks)
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}
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pctx, pcancel := context.WithTimeout(ctx, 1*time.Minute)
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defer pcancel()
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// Optimistically build new state, so we don't discover any light client failures at the end.
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state, err := s.stateProvider.State(pctx, snapshot.Height)
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if err != nil {
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// check if the main context was triggered
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if ctx.Err() != nil {
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return sm.State{}, nil, ctx.Err()
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}
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if err == light.ErrNoWitnesses {
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return sm.State{}, nil,
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fmt.Errorf("failed to get tendermint state at height %d. No witnesses remaining", snapshot.Height)
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}
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s.logger.Info("failed to get and verify tendermint state. Dropping snapshot and trying again",
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"err", err, "height", snapshot.Height)
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return sm.State{}, nil, errRejectSnapshot
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}
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commit, err := s.stateProvider.Commit(pctx, snapshot.Height)
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if err != nil {
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// check if the provider context exceeded the 10 second deadline
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if ctx.Err() != nil {
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return sm.State{}, nil, ctx.Err()
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}
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if err == light.ErrNoWitnesses {
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return sm.State{}, nil,
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fmt.Errorf("failed to get commit at height %d. No witnesses remaining", snapshot.Height)
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}
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s.logger.Info("failed to get and verify commit. Dropping snapshot and trying again",
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"err", err, "height", snapshot.Height)
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return sm.State{}, nil, errRejectSnapshot
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}
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// Restore snapshot
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err = s.applyChunks(ctx, chunks, fetchStartTime)
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if err != nil {
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return sm.State{}, nil, err
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}
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// Verify app and app version
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if err := s.verifyApp(ctx, snapshot, state.Version.Consensus.App); err != nil {
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return sm.State{}, nil, err
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}
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// Done! 🎉
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s.logger.Info("Snapshot restored", "height", snapshot.Height, "format", snapshot.Format,
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"hash", snapshot.Hash)
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return state, commit, nil
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}
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// offerSnapshot offers a snapshot to the app. It returns various errors depending on the app's
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// response, or nil if the snapshot was accepted.
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func (s *syncer) offerSnapshot(ctx context.Context, snapshot *snapshot) error {
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s.logger.Info("Offering snapshot to ABCI app", "height", snapshot.Height,
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"format", snapshot.Format, "hash", snapshot.Hash)
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resp, err := s.conn.OfferSnapshot(ctx, abci.RequestOfferSnapshot{
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Snapshot: &abci.Snapshot{
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Height: snapshot.Height,
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Format: snapshot.Format,
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Chunks: snapshot.Chunks,
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Hash: snapshot.Hash,
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Metadata: snapshot.Metadata,
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},
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AppHash: snapshot.trustedAppHash,
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})
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if err != nil {
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return fmt.Errorf("failed to offer snapshot: %w", err)
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}
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switch resp.Result {
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case abci.ResponseOfferSnapshot_ACCEPT:
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s.logger.Info("Snapshot accepted, restoring", "height", snapshot.Height,
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"format", snapshot.Format, "hash", snapshot.Hash)
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return nil
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case abci.ResponseOfferSnapshot_ABORT:
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return errAbort
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case abci.ResponseOfferSnapshot_REJECT:
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return errRejectSnapshot
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case abci.ResponseOfferSnapshot_REJECT_FORMAT:
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return errRejectFormat
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case abci.ResponseOfferSnapshot_REJECT_SENDER:
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return errRejectSender
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default:
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return fmt.Errorf("unknown ResponseOfferSnapshot result %v", resp.Result)
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}
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}
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// applyChunks applies chunks to the app. It returns various errors depending on the app's
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// response, or nil once the snapshot is fully restored.
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func (s *syncer) applyChunks(ctx context.Context, chunks *chunkQueue, start time.Time) error {
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for {
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chunk, err := chunks.Next()
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if err == errDone {
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return nil
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} else if err != nil {
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return fmt.Errorf("failed to fetch chunk: %w", err)
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}
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resp, err := s.conn.ApplySnapshotChunk(ctx, abci.RequestApplySnapshotChunk{
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Index: chunk.Index,
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Chunk: chunk.Chunk,
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Sender: string(chunk.Sender),
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})
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if err != nil {
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return fmt.Errorf("failed to apply chunk %v: %w", chunk.Index, err)
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}
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s.logger.Info("Applied snapshot chunk to ABCI app", "height", chunk.Height,
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"format", chunk.Format, "chunk", chunk.Index, "total", chunks.Size())
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// Discard and refetch any chunks as requested by the app
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for _, index := range resp.RefetchChunks {
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err := chunks.Discard(index)
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if err != nil {
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return fmt.Errorf("failed to discard chunk %v: %w", index, err)
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}
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}
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// Reject any senders as requested by the app
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for _, sender := range resp.RejectSenders {
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if sender != "" {
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peerID := types.NodeID(sender)
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s.snapshots.RejectPeer(peerID)
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if err := chunks.DiscardSender(peerID); err != nil {
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return fmt.Errorf("failed to reject sender: %w", err)
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}
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}
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}
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switch resp.Result {
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case abci.ResponseApplySnapshotChunk_ACCEPT:
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s.metrics.SnapshotChunk.Add(1)
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s.avgChunkTime = time.Since(start).Nanoseconds() / int64(chunks.numChunksReturned())
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s.metrics.ChunkProcessAvgTime.Set(float64(s.avgChunkTime))
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case abci.ResponseApplySnapshotChunk_ABORT:
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return errAbort
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case abci.ResponseApplySnapshotChunk_RETRY:
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chunks.Retry(chunk.Index)
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case abci.ResponseApplySnapshotChunk_RETRY_SNAPSHOT:
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return errRetrySnapshot
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case abci.ResponseApplySnapshotChunk_REJECT_SNAPSHOT:
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return errRejectSnapshot
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default:
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return fmt.Errorf("unknown ResponseApplySnapshotChunk result %v", resp.Result)
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}
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}
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}
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// fetchChunks requests chunks from peers, receiving allocations from the chunk queue. Chunks
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// will be received from the reactor via syncer.AddChunks() to chunkQueue.Add().
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func (s *syncer) fetchChunks(ctx context.Context, snapshot *snapshot, chunks *chunkQueue) {
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var (
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next = true
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index uint32
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err error
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)
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for {
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if next {
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index, err = chunks.Allocate()
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if errors.Is(err, errDone) {
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// Keep checking until the context is canceled (restore is done), in case any
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// chunks need to be refetched.
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select {
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case <-ctx.Done():
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return
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case <-time.After(2 * time.Second):
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continue
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}
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}
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if err != nil {
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s.logger.Error("Failed to allocate chunk from queue", "err", err)
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return
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}
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}
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s.logger.Info("Fetching snapshot chunk", "height", snapshot.Height,
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"format", snapshot.Format, "chunk", index, "total", chunks.Size())
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ticker := time.NewTicker(s.retryTimeout)
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defer ticker.Stop()
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if err := s.requestChunk(ctx, snapshot, index); err != nil {
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return
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}
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select {
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|
case <-chunks.WaitFor(index):
|
|
next = true
|
|
|
|
case <-ticker.C:
|
|
next = false
|
|
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
|
|
ticker.Stop()
|
|
}
|
|
}
|
|
|
|
// requestChunk requests a chunk from a peer.
|
|
//
|
|
// returns nil if there are no peers for the given snapshot or the
|
|
// request is successfully made and an error if the request cannot be
|
|
// completed
|
|
func (s *syncer) requestChunk(ctx context.Context, snapshot *snapshot, chunk uint32) error {
|
|
peer := s.snapshots.GetPeer(snapshot)
|
|
if peer == "" {
|
|
s.logger.Error("No valid peers found for snapshot", "height", snapshot.Height,
|
|
"format", snapshot.Format, "hash", snapshot.Hash)
|
|
return nil
|
|
}
|
|
|
|
s.logger.Debug(
|
|
"Requesting snapshot chunk",
|
|
"height", snapshot.Height,
|
|
"format", snapshot.Format,
|
|
"chunk", chunk,
|
|
"peer", peer,
|
|
)
|
|
|
|
msg := p2p.Envelope{
|
|
To: peer,
|
|
Message: &ssproto.ChunkRequest{
|
|
Height: snapshot.Height,
|
|
Format: snapshot.Format,
|
|
Index: chunk,
|
|
},
|
|
}
|
|
|
|
if err := s.chunkCh.Send(ctx, msg); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// verifyApp verifies the sync, checking the app hash, last block height and app version
|
|
func (s *syncer) verifyApp(ctx context.Context, snapshot *snapshot, appVersion uint64) error {
|
|
resp, err := s.conn.Info(ctx, proxy.RequestInfo)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to query ABCI app for appHash: %w", err)
|
|
}
|
|
|
|
// sanity check that the app version in the block matches the application's own record
|
|
// of its version
|
|
if resp.AppVersion != appVersion {
|
|
// An error here most likely means that the app hasn't inplemented state sync
|
|
// or the Info call correctly
|
|
return fmt.Errorf("app version mismatch. Expected: %d, got: %d",
|
|
appVersion, resp.AppVersion)
|
|
}
|
|
|
|
if !bytes.Equal(snapshot.trustedAppHash, resp.LastBlockAppHash) {
|
|
s.logger.Error("appHash verification failed",
|
|
"expected", snapshot.trustedAppHash,
|
|
"actual", resp.LastBlockAppHash)
|
|
return errVerifyFailed
|
|
}
|
|
|
|
if uint64(resp.LastBlockHeight) != snapshot.Height {
|
|
s.logger.Error(
|
|
"ABCI app reported unexpected last block height",
|
|
"expected", snapshot.Height,
|
|
"actual", resp.LastBlockHeight,
|
|
)
|
|
return errVerifyFailed
|
|
}
|
|
|
|
s.logger.Info("Verified ABCI app", "height", snapshot.Height, "appHash", snapshot.trustedAppHash)
|
|
return nil
|
|
}
|