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recover.go
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recover.go
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package tortoise
import (
"context"
"errors"
"fmt"
"github.com/spacemeshos/go-spacemesh/common/types"
"github.com/spacemeshos/go-spacemesh/datastore"
"github.com/spacemeshos/go-spacemesh/sql"
"github.com/spacemeshos/go-spacemesh/sql/atxs"
"github.com/spacemeshos/go-spacemesh/sql/ballots"
"github.com/spacemeshos/go-spacemesh/sql/beacons"
"github.com/spacemeshos/go-spacemesh/sql/blocks"
"github.com/spacemeshos/go-spacemesh/sql/certificates"
"github.com/spacemeshos/go-spacemesh/sql/identities"
"github.com/spacemeshos/go-spacemesh/sql/layers"
)
// Recover tortoise state from database.
func Recover(
ctx context.Context,
db *datastore.CachedDB,
current types.LayerID,
opts ...Opt,
) (*Tortoise, error) {
trtl, err := New(opts...)
if err != nil {
return nil, err
}
last, err := ballots.LatestLayer(db)
if err != nil {
return nil, fmt.Errorf("failed to load latest known layer: %w", err)
}
applied, err := layers.GetLastApplied(db)
if err != nil {
return nil, fmt.Errorf("get last applied: %w", err)
}
start := types.GetEffectiveGenesis() + 1
if applied > types.LayerID(trtl.cfg.WindowSize) {
window := applied - types.LayerID(trtl.cfg.WindowSize)
window = window.GetEpoch().
FirstLayer()
// windback to the start of the epoch to load ref ballots
if window > start {
prev, err1 := layers.GetAggregatedHash(db, window-1)
opinion, err2 := layers.GetAggregatedHash(db, window)
if err1 == nil && err2 == nil {
// tortoise will need reference to previous layer
trtl.RecoverFrom(window, opinion, prev)
start = window
}
}
}
malicious, err := identities.GetMalicious(db)
if err != nil {
return nil, fmt.Errorf("recover malicious %w", err)
}
for _, id := range malicious {
trtl.OnMalfeasance(id)
}
if types.GetEffectiveGenesis() != types.FirstEffectiveGenesis() {
// need to load the golden atxs after a checkpoint recovery
if err := recoverEpoch(types.GetEffectiveGenesis().Add(1).GetEpoch(), trtl, db); err != nil {
return nil, err
}
}
epoch, err := atxs.LatestEpoch(db)
if err != nil {
return nil, fmt.Errorf("failed to load latest epoch: %w", err)
}
epoch++ // recoverEpoch expects target epoch, rather than publish
if last.GetEpoch() != epoch {
for eid := last.GetEpoch(); eid <= epoch; eid++ {
if err := recoverEpoch(eid, trtl, db); err != nil {
return nil, err
}
}
}
for lid := start; !lid.After(last); lid = lid.Add(1) {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
if err := RecoverLayer(ctx, trtl, db, lid, trtl.OnRecoveredBallot); err != nil {
return nil, fmt.Errorf("failed to load tortoise state at layer %d: %w", lid, err)
}
}
if last == 0 {
last = current
} else {
last = min(last, current)
}
if last < start {
return trtl, nil
}
trtl.TallyVotes(ctx, last)
// find topmost layer that was already applied and reset pending
// so that result for that layer is not returned
for prev := last - 1; prev >= start; prev-- {
opinion, err := layers.GetAggregatedHash(db, prev)
if err == nil && opinion != types.EmptyLayerHash {
if trtl.OnApplied(prev, opinion) {
break
}
}
if err != nil && !errors.Is(err, sql.ErrNotFound) {
return nil, fmt.Errorf("check opinion %w", err)
}
}
return trtl, nil
}
func recoverEpoch(epoch types.EpochID, trtl *Tortoise, db *datastore.CachedDB) error {
if err := db.IterateEpochATXHeaders(epoch, func(header *types.ActivationTxHeader) error {
trtl.OnAtx(header.ToData())
return nil
}); err != nil {
return err
}
beacon, err := beacons.Get(db, epoch)
if err == nil && beacon != types.EmptyBeacon {
trtl.OnBeacon(epoch, beacon)
}
return nil
}
type ballotFunc func(*types.BallotTortoiseData)
func RecoverLayer(
ctx context.Context,
trtl *Tortoise,
db *datastore.CachedDB,
lid types.LayerID,
onBallot ballotFunc,
) error {
if lid.FirstInEpoch() {
if err := recoverEpoch(lid.GetEpoch(), trtl, db); err != nil {
return err
}
}
blocksrst, err := blocks.Layer(db, lid)
if err != nil {
return err
}
for _, block := range blocksrst {
valid, err := blocks.IsValid(db, block.ID())
if err != nil && errors.Is(err, sql.ErrNotFound) {
return err
}
if valid {
trtl.OnValidBlock(block.ToVote())
} else {
trtl.OnBlock(block.ToVote())
}
hare, err := certificates.GetHareOutput(db, lid)
if err != nil && !errors.Is(err, sql.ErrNotFound) {
return err
}
if err == nil {
trtl.OnHareOutput(lid, hare)
}
}
// NOTE(dshulyak) we loaded information about malicious identities earlier.
ballotsrst, err := ballots.LayerNoMalicious(db, lid)
if err != nil {
return err
}
for _, ballot := range ballotsrst {
if ballot.EpochData != nil {
onBallot(ballot.ToTortoiseData())
}
}
for _, ballot := range ballotsrst {
if ballot.EpochData == nil {
onBallot(ballot.ToTortoiseData())
}
}
coin, err := layers.GetWeakCoin(db, lid)
if err != nil && !errors.Is(err, sql.ErrNotFound) {
return err
} else if err == nil {
trtl.OnWeakCoin(lid, coin)
}
return nil
}