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377 lines
11 KiB
377 lines
11 KiB
package state
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"sync"
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"time"
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abci "github.com/tendermint/abci/types"
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cmn "github.com/tendermint/tmlibs/common"
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dbm "github.com/tendermint/tmlibs/db"
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"github.com/tendermint/tmlibs/log"
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wire "github.com/tendermint/go-wire"
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"github.com/tendermint/tendermint/types"
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)
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var (
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stateKey = []byte("stateKey")
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abciResponsesKey = []byte("abciResponsesKey")
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)
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func calcValidatorsKey(height uint64) []byte {
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return []byte(cmn.Fmt("validatorsKey:%v", height))
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}
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//-----------------------------------------------------------------------------
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// State represents the latest committed state of the Tendermint consensus,
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// including the last committed block and validator set.
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// Newly committed blocks are validated and executed against the State.
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// NOTE: not goroutine-safe.
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type State struct {
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// mtx for writing to db
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mtx sync.Mutex
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db dbm.DB
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ChainID string
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// Consensus parameters used for validating blocks
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Params types.ConsensusParams
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// These fields are updated by SetBlockAndValidators.
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// LastBlockHeight=0 at genesis (ie. block(H=0) does not exist)
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// LastValidators is used to validate block.LastCommit.
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LastBlockHeight uint64
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LastBlockID types.BlockID
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LastBlockTime time.Time
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Validators *types.ValidatorSet
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LastValidators *types.ValidatorSet
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// When a block returns a validator set change via EndBlock,
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// the change only applies to the next block.
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// So, if s.LastBlockHeight causes a valset change,
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// we set s.LastHeightValidatorsChanged = s.LastBlockHeight + 1
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LastHeightValidatorsChanged uint64
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// AppHash is updated after Commit
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AppHash []byte
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logger log.Logger
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}
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// GetState loads the most recent state from the database,
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// or creates a new one from the given genesisFile and persists the result
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// to the database.
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func GetState(stateDB dbm.DB, genesisFile string) (*State, error) {
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state := LoadState(stateDB)
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if state == nil {
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var err error
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state, err = MakeGenesisStateFromFile(stateDB, genesisFile)
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if err != nil {
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return nil, err
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}
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state.Save()
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}
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return state, nil
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}
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// LoadState loads the State from the database.
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func LoadState(db dbm.DB) *State {
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return loadState(db, stateKey)
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}
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func loadState(db dbm.DB, key []byte) *State {
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buf := db.Get(key)
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if len(buf) == 0 {
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return nil
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}
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s := &State{db: db}
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r, n, err := bytes.NewReader(buf), new(int), new(error)
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wire.ReadBinaryPtr(&s, r, 0, n, err)
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if *err != nil {
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// DATA HAS BEEN CORRUPTED OR THE SPEC HAS CHANGED
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cmn.Exit(cmn.Fmt(`LoadState: Data has been corrupted or its spec has changed:
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%v\n`, *err))
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}
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// TODO: ensure that buf is completely read.
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return s
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}
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// SetLogger sets the logger on the State.
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func (s *State) SetLogger(l log.Logger) {
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s.logger = l
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}
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// Copy makes a copy of the State for mutating.
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func (s *State) Copy() *State {
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return &State{
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db: s.db,
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LastBlockHeight: s.LastBlockHeight,
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LastBlockID: s.LastBlockID,
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LastBlockTime: s.LastBlockTime,
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Validators: s.Validators.Copy(),
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LastValidators: s.LastValidators.Copy(),
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AppHash: s.AppHash,
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LastHeightValidatorsChanged: s.LastHeightValidatorsChanged,
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logger: s.logger,
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ChainID: s.ChainID,
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Params: s.Params,
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}
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}
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// Save persists the State to the database.
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func (s *State) Save() {
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s.mtx.Lock()
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defer s.mtx.Unlock()
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s.saveValidatorsInfo()
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s.db.SetSync(stateKey, s.Bytes())
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}
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// SaveABCIResponses persists the ABCIResponses to the database.
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// This is useful in case we crash after app.Commit and before s.Save().
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func (s *State) SaveABCIResponses(abciResponses *ABCIResponses) {
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s.db.SetSync(abciResponsesKey, abciResponses.Bytes())
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}
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// LoadABCIResponses loads the ABCIResponses from the database.
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// This is useful for recovering from crashes where we called app.Commit and before we called
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// s.Save()
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func (s *State) LoadABCIResponses() *ABCIResponses {
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buf := s.db.Get(abciResponsesKey)
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if len(buf) == 0 {
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return nil
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}
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abciResponses := new(ABCIResponses)
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r, n, err := bytes.NewReader(buf), new(int), new(error)
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wire.ReadBinaryPtr(abciResponses, r, 0, n, err)
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if *err != nil {
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// DATA HAS BEEN CORRUPTED OR THE SPEC HAS CHANGED
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cmn.Exit(cmn.Fmt(`LoadABCIResponses: Data has been corrupted or its spec has
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changed: %v\n`, *err))
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}
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// TODO: ensure that buf is completely read.
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return abciResponses
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}
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// LoadValidators loads the ValidatorSet for a given height.
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func (s *State) LoadValidators(height uint64) (*types.ValidatorSet, error) {
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valInfo := s.loadValidators(height)
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if valInfo == nil {
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return nil, ErrNoValSetForHeight{height}
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}
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if valInfo.ValidatorSet == nil {
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valInfo = s.loadValidators(valInfo.LastHeightChanged)
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if valInfo == nil {
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cmn.PanicSanity(fmt.Sprintf(`Couldn't find validators at height %d as
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last changed from height %d`, valInfo.LastHeightChanged, height))
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}
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}
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return valInfo.ValidatorSet, nil
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}
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func (s *State) loadValidators(height uint64) *ValidatorsInfo {
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buf := s.db.Get(calcValidatorsKey(height))
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if len(buf) == 0 {
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return nil
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}
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v := new(ValidatorsInfo)
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r, n, err := bytes.NewReader(buf), new(int), new(error)
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wire.ReadBinaryPtr(v, r, 0, n, err)
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if *err != nil {
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// DATA HAS BEEN CORRUPTED OR THE SPEC HAS CHANGED
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cmn.Exit(cmn.Fmt(`LoadValidators: Data has been corrupted or its spec has changed:
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%v\n`, *err))
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}
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// TODO: ensure that buf is completely read.
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return v
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}
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// saveValidatorsInfo persists the validator set for the next block to disk.
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// It should be called from s.Save(), right before the state itself is persisted.
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// If the validator set did not change after processing the latest block,
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// only the last height for which the validators changed is persisted.
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func (s *State) saveValidatorsInfo() {
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changeHeight := s.LastHeightValidatorsChanged
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nextHeight := s.LastBlockHeight + 1
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valInfo := &ValidatorsInfo{
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LastHeightChanged: changeHeight,
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}
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if changeHeight == nextHeight {
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valInfo.ValidatorSet = s.Validators
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}
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s.db.SetSync(calcValidatorsKey(nextHeight), valInfo.Bytes())
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}
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// Equals returns true if the States are identical.
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func (s *State) Equals(s2 *State) bool {
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return bytes.Equal(s.Bytes(), s2.Bytes())
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}
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// Bytes serializes the State using go-wire.
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func (s *State) Bytes() []byte {
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return wire.BinaryBytes(s)
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}
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// SetBlockAndValidators mutates State variables
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// to update block and validators after running EndBlock.
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func (s *State) SetBlockAndValidators(header *types.Header, blockPartsHeader types.PartSetHeader,
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abciResponses *ABCIResponses) {
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// copy the valset so we can apply changes from EndBlock
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// and update s.LastValidators and s.Validators
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prevValSet := s.Validators.Copy()
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nextValSet := prevValSet.Copy()
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// update the validator set with the latest abciResponses
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if len(abciResponses.EndBlock.Diffs) > 0 {
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err := updateValidators(nextValSet, abciResponses.EndBlock.Diffs)
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if err != nil {
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s.logger.Error("Error changing validator set", "err", err)
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// TODO: err or carry on?
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}
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// change results from this height but only applies to the next height
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s.LastHeightValidatorsChanged = header.Height + 1
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}
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// Update validator accums and set state variables
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nextValSet.IncrementAccum(1)
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s.setBlockAndValidators(header.Height,
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types.BlockID{header.Hash(), blockPartsHeader},
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header.Time,
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prevValSet, nextValSet)
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}
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func (s *State) setBlockAndValidators(height uint64, blockID types.BlockID, blockTime time.Time,
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prevValSet, nextValSet *types.ValidatorSet) {
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s.LastBlockHeight = height
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s.LastBlockID = blockID
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s.LastBlockTime = blockTime
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s.Validators = nextValSet
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s.LastValidators = prevValSet
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}
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// GetValidators returns the last and current validator sets.
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func (s *State) GetValidators() (last *types.ValidatorSet, current *types.ValidatorSet) {
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return s.LastValidators, s.Validators
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}
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//------------------------------------------------------------------------
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// ABCIResponses retains the responses of the various ABCI calls during block processing.
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// It is persisted to disk before calling Commit.
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type ABCIResponses struct {
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Height uint64
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DeliverTx []*abci.ResponseDeliverTx
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EndBlock *abci.ResponseEndBlock
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txs types.Txs // reference for indexing results by hash
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}
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// NewABCIResponses returns a new ABCIResponses
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func NewABCIResponses(block *types.Block) *ABCIResponses {
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return &ABCIResponses{
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Height: block.Height,
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DeliverTx: make([]*abci.ResponseDeliverTx, block.NumTxs),
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txs: block.Data.Txs,
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}
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}
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// Bytes serializes the ABCIResponse using go-wire
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func (a *ABCIResponses) Bytes() []byte {
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return wire.BinaryBytes(*a)
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}
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//-----------------------------------------------------------------------------
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// ValidatorsInfo represents the latest validator set, or the last height it changed
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type ValidatorsInfo struct {
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ValidatorSet *types.ValidatorSet
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LastHeightChanged uint64
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}
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// Bytes serializes the ValidatorsInfo using go-wire
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func (valInfo *ValidatorsInfo) Bytes() []byte {
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return wire.BinaryBytes(*valInfo)
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}
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//------------------------------------------------------------------------
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// Genesis
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// MakeGenesisStateFromFile reads and unmarshals state from the given
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// file.
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//
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// Used during replay and in tests.
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func MakeGenesisStateFromFile(db dbm.DB, genDocFile string) (*State, error) {
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genDoc, err := MakeGenesisDocFromFile(genDocFile)
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if err != nil {
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return nil, err
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}
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return MakeGenesisState(db, genDoc)
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}
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// MakeGenesisDocFromFile reads and unmarshals genesis doc from the given file.
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func MakeGenesisDocFromFile(genDocFile string) (*types.GenesisDoc, error) {
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genDocJSON, err := ioutil.ReadFile(genDocFile)
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if err != nil {
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return nil, fmt.Errorf("Couldn't read GenesisDoc file: %v", err)
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}
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genDoc, err := types.GenesisDocFromJSON(genDocJSON)
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if err != nil {
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return nil, fmt.Errorf("Error reading GenesisDoc: %v", err)
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}
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return genDoc, nil
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}
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// MakeGenesisState creates state from types.GenesisDoc.
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func MakeGenesisState(db dbm.DB, genDoc *types.GenesisDoc) (*State, error) {
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err := genDoc.ValidateAndComplete()
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if err != nil {
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return nil, fmt.Errorf("Error in genesis file: %v", err)
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}
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// Make validators slice
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validators := make([]*types.Validator, len(genDoc.Validators))
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for i, val := range genDoc.Validators {
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pubKey := val.PubKey
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address := pubKey.Address()
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// Make validator
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validators[i] = &types.Validator{
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Address: address,
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PubKey: pubKey,
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VotingPower: val.Power,
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}
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}
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return &State{
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db: db,
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ChainID: genDoc.ChainID,
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Params: *genDoc.ConsensusParams,
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LastBlockHeight: 0,
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LastBlockID: types.BlockID{},
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LastBlockTime: genDoc.GenesisTime,
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Validators: types.NewValidatorSet(validators),
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LastValidators: types.NewValidatorSet(nil),
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AppHash: genDoc.AppHash,
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LastHeightValidatorsChanged: 1,
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}, nil
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}
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