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package state
import (
"bytes"
"errors"
"fmt"
"github.com/gogo/protobuf/proto"
"github.com/google/orderedcode"
dbm "github.com/tendermint/tm-db"
abci "github.com/tendermint/tendermint/abci/types"
tmmath "github.com/tendermint/tendermint/libs/math"
tmos "github.com/tendermint/tendermint/libs/os"
tmstate "github.com/tendermint/tendermint/proto/tendermint/state"
tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
"github.com/tendermint/tendermint/types"
)
const (
// persist validators every valSetCheckpointInterval blocks to avoid
// LoadValidators taking too much time.
// https://github.com/tendermint/tendermint/pull/3438
// 100000 results in ~ 100ms to get 100 validators (see BenchmarkLoadValidators)
valSetCheckpointInterval = 100000
)
//------------------------------------------------------------------------
const (
// prefixes are unique across all tm db's
prefixValidators = int64(5)
prefixConsensusParams = int64(6)
prefixABCIResponses = int64(7)
prefixState = int64(8)
)
func encodeKey(prefix int64, height int64) []byte {
res, err := orderedcode.Append(nil, prefix, height)
if err != nil {
panic(err)
}
return res
}
func validatorsKey(height int64) []byte {
return encodeKey(prefixValidators, height)
}
func consensusParamsKey(height int64) []byte {
return encodeKey(prefixConsensusParams, height)
}
func abciResponsesKey(height int64) []byte {
return encodeKey(prefixABCIResponses, height)
}
// stateKey should never change after being set in init()
var stateKey []byte
func init() {
var err error
stateKey, err = orderedcode.Append(nil, prefixState)
if err != nil {
panic(err)
}
}
//----------------------
//go:generate mockery --case underscore --name Store
// Store defines the state store interface
//
// It is used to retrieve current state and save and load ABCI responses,
// validators and consensus parameters
type Store interface {
// LoadFromDBOrGenesisFile loads the most recent state.
// If the chain is new it will use the genesis file from the provided genesis file path as the current state.
LoadFromDBOrGenesisFile(string) (State, error)
// LoadFromDBOrGenesisDoc loads the most recent state.
// If the chain is new it will use the genesis doc as the current state.
LoadFromDBOrGenesisDoc(*types.GenesisDoc) (State, error)
// Load loads the current state of the blockchain
Load() (State, error)
// LoadValidators loads the validator set at a given height
LoadValidators(int64) (*types.ValidatorSet, error)
// LoadABCIResponses loads the abciResponse for a given height
LoadABCIResponses(int64) (*tmstate.ABCIResponses, error)
// LoadConsensusParams loads the consensus params for a given height
LoadConsensusParams(int64) (types.ConsensusParams, error)
// Save overwrites the previous state with the updated one
Save(State) error
// SaveABCIResponses saves ABCIResponses for a given height
SaveABCIResponses(int64, *tmstate.ABCIResponses) error
// Bootstrap is used for bootstrapping state when not starting from a initial height.
Bootstrap(State) error
// PruneStates takes the height from which to prune up to (exclusive)
PruneStates(int64) error
}
// dbStore wraps a db (github.com/tendermint/tm-db)
type dbStore struct {
db dbm.DB
}
var _ Store = (*dbStore)(nil)
// NewStore creates the dbStore of the state pkg.
func NewStore(db dbm.DB) Store {
return dbStore{db}
}
// LoadStateFromDBOrGenesisFile loads the most recent state from the database,
// or creates a new one from the given genesisFilePath.
func (store dbStore) LoadFromDBOrGenesisFile(genesisFilePath string) (State, error) {
state, err := store.Load()
if err != nil {
return State{}, err
}
if state.IsEmpty() {
var err error
state, err = MakeGenesisStateFromFile(genesisFilePath)
if err != nil {
return state, err
}
}
return state, nil
}
// LoadStateFromDBOrGenesisDoc loads the most recent state from the database,
// or creates a new one from the given genesisDoc.
func (store dbStore) LoadFromDBOrGenesisDoc(genesisDoc *types.GenesisDoc) (State, error) {
state, err := store.Load()
if err != nil {
return State{}, err
}
if state.IsEmpty() {
var err error
state, err = MakeGenesisState(genesisDoc)
if err != nil {
return state, err
}
}
return state, nil
}
// LoadState loads the State from the database.
func (store dbStore) Load() (State, error) {
return store.loadState(stateKey)
}
func (store dbStore) loadState(key []byte) (state State, err error) {
buf, err := store.db.Get(key)
if err != nil {
return state, err
}
if len(buf) == 0 {
return state, nil
}
sp := new(tmstate.State)
err = proto.Unmarshal(buf, sp)
if err != nil {
// DATA HAS BEEN CORRUPTED OR THE SPEC HAS CHANGED
tmos.Exit(fmt.Sprintf(`LoadState: Data has been corrupted or its spec has changed:
%v\n`, err))
}
sm, err := StateFromProto(sp)
if err != nil {
return state, err
}
return *sm, nil
}
// Save persists the State, the ValidatorsInfo, and the ConsensusParamsInfo to the database.
// This flushes the writes (e.g. calls SetSync).
func (store dbStore) Save(state State) error {
return store.save(state, stateKey)
}
func (store dbStore) save(state State, key []byte) error {
batch := store.db.NewBatch()
defer batch.Close()
nextHeight := state.LastBlockHeight + 1
// If first block, save validators for the block.
if nextHeight == 1 {
nextHeight = state.InitialHeight
// This extra logic due to Tendermint validator set changes being delayed 1 block.
// It may get overwritten due to InitChain validator updates.
if err := store.saveValidatorsInfo(nextHeight, nextHeight, state.Validators, batch); err != nil {
return err
}
}
// Save next validators.
err := store.saveValidatorsInfo(nextHeight+1, state.LastHeightValidatorsChanged, state.NextValidators, batch)
if err != nil {
return err
}
// Save next consensus params.
if err := store.saveConsensusParamsInfo(nextHeight,
state.LastHeightConsensusParamsChanged, state.ConsensusParams, batch); err != nil {
return err
}
if err := batch.Set(key, state.Bytes()); err != nil {
return err
}
return batch.WriteSync()
}
// BootstrapState saves a new state, used e.g. by state sync when starting from non-zero height.
func (store dbStore) Bootstrap(state State) error {
height := state.LastBlockHeight + 1
if height == 1 {
height = state.InitialHeight
}
batch := store.db.NewBatch()
defer batch.Close()
if height > 1 && !state.LastValidators.IsNilOrEmpty() {
if err := store.saveValidatorsInfo(height-1, height-1, state.LastValidators, batch); err != nil {
return err
}
}
if err := store.saveValidatorsInfo(height, height, state.Validators, batch); err != nil {
return err
}
if err := store.saveValidatorsInfo(height+1, height+1, state.NextValidators, batch); err != nil {
return err
}
if err := store.saveConsensusParamsInfo(height,
state.LastHeightConsensusParamsChanged, state.ConsensusParams, batch); err != nil {
return err
}
if err := batch.Set(stateKey, state.Bytes()); err != nil {
return err
}
return batch.WriteSync()
}
// PruneStates deletes states up to the height specified (exclusive). It is not
// guaranteed to delete all states, since the last checkpointed state and states being pointed to by
// e.g. `LastHeightChanged` must remain. The state at retain height must also exist.
// Pruning is done in descending order.
func (store dbStore) PruneStates(retainHeight int64) error {
if retainHeight <= 0 {
return fmt.Errorf("height %v must be greater than 0", retainHeight)
}
// NOTE: We need to prune consensus params first because the validator
// sets have always one extra height. If validator sets were pruned first
// we could get a situation where we prune up to the last validator set
// yet don't have the respective consensus params at that height and thus
// return an error
if err := store.pruneConsensusParams(retainHeight); err != nil {
return err
}
if err := store.pruneValidatorSets(retainHeight); err != nil {
return err
}
if err := store.pruneABCIResponses(retainHeight); err != nil {
return err
}
return nil
}
// pruneValidatorSets calls a reverse iterator from base height to retain height (exclusive), deleting
// all validator sets in between. Due to the fact that most validator sets stored reference an earlier
// validator set, it is likely that there will remain one validator set left after pruning.
func (store dbStore) pruneValidatorSets(retainHeight int64) error {
valInfo, err := loadValidatorsInfo(store.db, retainHeight)
if err != nil {
return fmt.Errorf("validators at height %v not found: %w", retainHeight, err)
}
// We will prune up to the validator set at the given "height". As we don't save validator sets every
// height but only when they change or at a check point, it is likely that the validator set at the height
// we prune to is empty and thus dependent on the validator set saved at a previous height. We must find
// that validator set and make sure it is not pruned.
lastRecordedValSetHeight := lastStoredHeightFor(retainHeight, valInfo.LastHeightChanged)
lastRecordedValSet, err := loadValidatorsInfo(store.db, lastRecordedValSetHeight)
if err != nil || lastRecordedValSet.ValidatorSet == nil {
return fmt.Errorf("couldn't find validators at height %d (height %d was originally requested): %w",
lastStoredHeightFor(retainHeight, valInfo.LastHeightChanged),
retainHeight,
err,
)
}
// if this is not equal to the retain height, prune from the retain height to the height above
// the last saved validator set. This way we can skip over the dependent validator set.
if lastRecordedValSetHeight < retainHeight {
err := store.pruneRange(
validatorsKey(lastRecordedValSetHeight+1),
validatorsKey(retainHeight),
)
if err != nil {
return err
}
}
// prune all the validators sets up to last saved validator set
return store.pruneRange(
validatorsKey(1),
validatorsKey(lastRecordedValSetHeight),
)
}
// pruneConsensusParams calls a reverse iterator from base height to retain height batch deleting
// all consensus params in between. If the consensus params at the new base height is dependent
// on a prior height then this will keep that lower height too.
func (store dbStore) pruneConsensusParams(retainHeight int64) error {
paramsInfo, err := store.loadConsensusParamsInfo(retainHeight)
if err != nil {
return fmt.Errorf("consensus params at height %v not found: %w", retainHeight, err)
}
// As we don't save the consensus params at every height, only when there is a consensus params change,
// we must not prune (or save) the last consensus params that the consensus params info at height
// is dependent on.
if paramsInfo.ConsensusParams.Equal(&tmproto.ConsensusParams{}) {
// sanity check that the consensus params at the last height it was changed is there
lastRecordedConsensusParams, err := store.loadConsensusParamsInfo(paramsInfo.LastHeightChanged)
if err != nil || lastRecordedConsensusParams.ConsensusParams.Equal(&tmproto.ConsensusParams{}) {
return fmt.Errorf(
"couldn't find consensus params at height %d (height %d was originally requested): %w",
paramsInfo.LastHeightChanged,
retainHeight,
err,
)
}
// prune the params above the height with which it last changed and below the retain height.
err = store.pruneRange(
consensusParamsKey(paramsInfo.LastHeightChanged+1),
consensusParamsKey(retainHeight),
)
if err != nil {
return err
}
}
// prune all the consensus params up to either the last height the params changed or if the params
// last changed at the retain height, then up to the retain height.
return store.pruneRange(
consensusParamsKey(1),
consensusParamsKey(paramsInfo.LastHeightChanged),
)
}
// pruneABCIResponses calls a reverse iterator from base height to retain height batch deleting
// all abci responses in between
func (store dbStore) pruneABCIResponses(height int64) error {
return store.pruneRange(abciResponsesKey(1), abciResponsesKey(height))
}
// pruneRange is a generic function for deleting a range of keys in reverse order.
// we keep filling up batches of at most 1000 keys, perform a deletion and continue until
// we have gone through all of keys in the range. This avoids doing any writes whilst
// iterating.
func (store dbStore) pruneRange(start []byte, end []byte) error {
var err error
batch := store.db.NewBatch()
defer batch.Close()
end, err = store.reverseBatchDelete(batch, start, end)
if err != nil {
return err
}
// iterate until the last batch of the pruning range in which case we will perform a
// write sync
for !bytes.Equal(start, end) {
if err := batch.Write(); err != nil {
return err
}
if err := batch.Close(); err != nil {
return err
}
batch = store.db.NewBatch()
// fill a new batch of keys for deletion over the remainding range
end, err = store.reverseBatchDelete(batch, start, end)
if err != nil {
return err
}
}
return batch.WriteSync()
}
// reverseBatchDelete runs a reverse iterator (from end to start) filling up a batch until either
// (a) the iterator reaches the start or (b) the iterator has added a 1000 keys (this avoids the
// batch from growing too large)
func (store dbStore) reverseBatchDelete(batch dbm.Batch, start, end []byte) ([]byte, error) {
iter, err := store.db.ReverseIterator(start, end)
if err != nil {
return end, fmt.Errorf("iterator error: %w", err)
}
defer iter.Close()
size := 0
for ; iter.Valid(); iter.Next() {
if err := batch.Delete(iter.Key()); err != nil {
return end, fmt.Errorf("pruning error at key %X: %w", iter.Key(), err)
}
// avoid batches growing too large by capping them
size++
if size == 1000 {
return iter.Key(), iter.Error()
}
}
return start, iter.Error()
}
//------------------------------------------------------------------------
// ABCIResponsesResultsHash returns the root hash of a Merkle tree of
// ResponseDeliverTx responses (see ABCIResults.Hash)
//
// See merkle.SimpleHashFromByteSlices
func ABCIResponsesResultsHash(ar *tmstate.ABCIResponses) []byte {
return types.NewResults(ar.DeliverTxs).Hash()
}
// LoadABCIResponses loads the ABCIResponses for the given height from the
// database. If not found, ErrNoABCIResponsesForHeight is returned.
//
// This is useful for recovering from crashes where we called app.Commit and
// before we called s.Save(). It can also be used to produce Merkle proofs of
// the result of txs.
func (store dbStore) LoadABCIResponses(height int64) (*tmstate.ABCIResponses, error) {
buf, err := store.db.Get(abciResponsesKey(height))
if err != nil {
return nil, err
}
if len(buf) == 0 {
return nil, ErrNoABCIResponsesForHeight{height}
}
abciResponses := new(tmstate.ABCIResponses)
err = abciResponses.Unmarshal(buf)
if err != nil {
// DATA HAS BEEN CORRUPTED OR THE SPEC HAS CHANGED
tmos.Exit(fmt.Sprintf(`LoadABCIResponses: Data has been corrupted or its spec has
changed: %v\n`, err))
}
// TODO: ensure that buf is completely read.
return abciResponses, nil
}
// SaveABCIResponses persists the ABCIResponses to the database.
// This is useful in case we crash after app.Commit and before s.Save().
// Responses are indexed by height so they can also be loaded later to produce
// Merkle proofs.
//
// Exposed for testing.
func (store dbStore) SaveABCIResponses(height int64, abciResponses *tmstate.ABCIResponses) error {
return store.saveABCIResponses(height, abciResponses)
}
func (store dbStore) saveABCIResponses(height int64, abciResponses *tmstate.ABCIResponses) error {
var dtxs []*abci.ResponseDeliverTx
// strip nil values,
for _, tx := range abciResponses.DeliverTxs {
if tx != nil {
dtxs = append(dtxs, tx)
}
}
abciResponses.DeliverTxs = dtxs
bz, err := abciResponses.Marshal()
if err != nil {
return err
}
return store.db.SetSync(abciResponsesKey(height), bz)
}
//-----------------------------------------------------------------------------
// LoadValidators loads the ValidatorSet for a given height.
// Returns ErrNoValSetForHeight if the validator set can't be found for this height.
func (store dbStore) LoadValidators(height int64) (*types.ValidatorSet, error) {
valInfo, err := loadValidatorsInfo(store.db, height)
if err != nil {
return nil, ErrNoValSetForHeight{height}
}
if valInfo.ValidatorSet == nil {
lastStoredHeight := lastStoredHeightFor(height, valInfo.LastHeightChanged)
valInfo2, err := loadValidatorsInfo(store.db, lastStoredHeight)
if err != nil || valInfo2.ValidatorSet == nil {
return nil,
fmt.Errorf("couldn't find validators at height %d (height %d was originally requested): %w",
lastStoredHeight,
height,
err,
)
}
vs, err := types.ValidatorSetFromProto(valInfo2.ValidatorSet)
if err != nil {
return nil, err
}
vs.IncrementProposerPriority(tmmath.SafeConvertInt32(height - lastStoredHeight)) // mutate
vi2, err := vs.ToProto()
if err != nil {
return nil, err
}
valInfo2.ValidatorSet = vi2
valInfo = valInfo2
}
vip, err := types.ValidatorSetFromProto(valInfo.ValidatorSet)
if err != nil {
return nil, err
}
return vip, nil
}
func lastStoredHeightFor(height, lastHeightChanged int64) int64 {
checkpointHeight := height - height%valSetCheckpointInterval
return tmmath.MaxInt64(checkpointHeight, lastHeightChanged)
}
// CONTRACT: Returned ValidatorsInfo can be mutated.
func loadValidatorsInfo(db dbm.DB, height int64) (*tmstate.ValidatorsInfo, error) {
buf, err := db.Get(validatorsKey(height))
if err != nil {
return nil, err
}
if len(buf) == 0 {
return nil, errors.New("value retrieved from db is empty")
}
v := new(tmstate.ValidatorsInfo)
err = v.Unmarshal(buf)
if err != nil {
// DATA HAS BEEN CORRUPTED OR THE SPEC HAS CHANGED
tmos.Exit(fmt.Sprintf(`LoadValidators: Data has been corrupted or its spec has changed:
%v\n`, err))
}
// TODO: ensure that buf is completely read.
return v, nil
}
// saveValidatorsInfo persists the validator set.
//
// `height` is the effective height for which the validator is responsible for
// signing. It should be called from s.Save(), right before the state itself is
// persisted.
func (store dbStore) saveValidatorsInfo(
height, lastHeightChanged int64,
valSet *types.ValidatorSet,
batch dbm.Batch,
) error {
if lastHeightChanged > height {
return errors.New("lastHeightChanged cannot be greater than ValidatorsInfo height")
}
valInfo := &tmstate.ValidatorsInfo{
LastHeightChanged: lastHeightChanged,
}
// Only persist validator set if it was updated or checkpoint height (see
// valSetCheckpointInterval) is reached.
if height == lastHeightChanged || height%valSetCheckpointInterval == 0 {
pv, err := valSet.ToProto()
if err != nil {
return err
}
valInfo.ValidatorSet = pv
}
bz, err := valInfo.Marshal()
if err != nil {
return err
}
err = batch.Set(validatorsKey(height), bz)
if err != nil {
return err
}
return nil
}
//-----------------------------------------------------------------------------
// ConsensusParamsInfo represents the latest consensus params, or the last height it changed
// Allocate empty Consensus params at compile time to avoid multiple allocations during runtime
var (
empty = types.ConsensusParams{}
emptypb = tmproto.ConsensusParams{}
)
// LoadConsensusParams loads the ConsensusParams for a given height.
func (store dbStore) LoadConsensusParams(height int64) (types.ConsensusParams, error) {
paramsInfo, err := store.loadConsensusParamsInfo(height)
if err != nil {
return empty, fmt.Errorf("could not find consensus params for height #%d: %w", height, err)
}
if paramsInfo.ConsensusParams.Equal(&emptypb) {
paramsInfo2, err := store.loadConsensusParamsInfo(paramsInfo.LastHeightChanged)
if err != nil {
return empty, fmt.Errorf(
"couldn't find consensus params at height %d (height %d was originally requested): %w",
paramsInfo.LastHeightChanged,
height,
err,
)
}
paramsInfo = paramsInfo2
}
return types.ConsensusParamsFromProto(paramsInfo.ConsensusParams), nil
}
func (store dbStore) loadConsensusParamsInfo(height int64) (*tmstate.ConsensusParamsInfo, error) {
buf, err := store.db.Get(consensusParamsKey(height))
if err != nil {
return nil, err
}
if len(buf) == 0 {
return nil, errors.New("value retrieved from db is empty")
}
paramsInfo := new(tmstate.ConsensusParamsInfo)
if err = paramsInfo.Unmarshal(buf); err != nil {
// DATA HAS BEEN CORRUPTED OR THE SPEC HAS CHANGED
tmos.Exit(fmt.Sprintf(`LoadConsensusParams: Data has been corrupted or its spec has changed:
%v\n`, err))
}
// TODO: ensure that buf is completely read.
return paramsInfo, nil
}
// saveConsensusParamsInfo persists the consensus params for the next block to disk.
// It should be called from s.Save(), right before the state itself is persisted.
// If the consensus params did not change after processing the latest block,
// only the last height for which they changed is persisted.
func (store dbStore) saveConsensusParamsInfo(
nextHeight, changeHeight int64,
params types.ConsensusParams,
batch dbm.Batch,
) error {
paramsInfo := &tmstate.ConsensusParamsInfo{
LastHeightChanged: changeHeight,
}
if changeHeight == nextHeight {
paramsInfo.ConsensusParams = params.ToProto()
}
bz, err := paramsInfo.Marshal()
if err != nil {
return err
}
err = batch.Set(consensusParamsKey(nextHeight), bz)
if err != nil {
return err
}
return nil
}