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package state
import (
"bytes"
"errors"
"fmt"
"io/ioutil"
"time"
"github.com/gogo/protobuf/proto"
tmstate "github.com/tendermint/tendermint/proto/state"
tmproto "github.com/tendermint/tendermint/proto/types"
tmversion "github.com/tendermint/tendermint/proto/version"
"github.com/tendermint/tendermint/types"
tmtime "github.com/tendermint/tendermint/types/time"
"github.com/tendermint/tendermint/version"
)
// database keys
var (
stateKey = []byte("stateKey")
)
//-----------------------------------------------------------------------------
// InitStateVersion sets the Consensus.Block and Software versions,
// but leaves the Consensus.App version blank.
// The Consensus.App version will be set during the Handshake, once
// we hear from the app what protocol version it is running.
var InitStateVersion = tmstate.Version{
Consensus: tmversion.Consensus{
Block: version.BlockProtocol,
App: 0,
},
Software: version.TMCoreSemVer,
}
//-----------------------------------------------------------------------------
// State is a short description of the latest committed block of the Tendermint consensus.
// It keeps all information necessary to validate new blocks,
// including the last validator set and the consensus params.
// All fields are exposed so the struct can be easily serialized,
// but none of them should be mutated directly.
// Instead, use state.Copy() or state.NextState(...).
// NOTE: not goroutine-safe.
type State struct {
Version tmstate.Version
// immutable
ChainID string
// LastBlockHeight=0 at genesis (ie. block(H=0) does not exist)
LastBlockHeight int64
LastBlockID types.BlockID
LastBlockTime time.Time
// LastValidators is used to validate block.LastCommit.
// Validators are persisted to the database separately every time they change,
// so we can query for historical validator sets.
// Note that if s.LastBlockHeight causes a valset change,
// we set s.LastHeightValidatorsChanged = s.LastBlockHeight + 1 + 1
// Extra +1 due to nextValSet delay.
NextValidators *types.ValidatorSet
Validators *types.ValidatorSet
LastValidators *types.ValidatorSet
LastHeightValidatorsChanged int64
// Consensus parameters used for validating blocks.
// Changes returned by EndBlock and updated after Commit.
ConsensusParams tmproto.ConsensusParams
LastHeightConsensusParamsChanged int64
// Merkle root of the results from executing prev block
LastResultsHash []byte
// the latest AppHash we've received from calling abci.Commit()
AppHash []byte
}
// Copy makes a copy of the State for mutating.
func (state State) Copy() State {
return State{
Version: state.Version,
ChainID: state.ChainID,
LastBlockHeight: state.LastBlockHeight,
LastBlockID: state.LastBlockID,
LastBlockTime: state.LastBlockTime,
NextValidators: state.NextValidators.Copy(),
Validators: state.Validators.Copy(),
LastValidators: state.LastValidators.Copy(),
LastHeightValidatorsChanged: state.LastHeightValidatorsChanged,
ConsensusParams: state.ConsensusParams,
LastHeightConsensusParamsChanged: state.LastHeightConsensusParamsChanged,
AppHash: state.AppHash,
LastResultsHash: state.LastResultsHash,
}
}
// Equals returns true if the States are identical.
func (state State) Equals(state2 State) bool {
sbz, s2bz := state.Bytes(), state2.Bytes()
return bytes.Equal(sbz, s2bz)
}
// Bytes serializes the State using protobuf.
// It panics if either casting to protobuf or serialization fails.
func (state State) Bytes() []byte {
sm, err := state.ToProto()
if err != nil {
panic(err)
}
bz, err := proto.Marshal(sm)
if err != nil {
panic(err)
}
return bz
}
// IsEmpty returns true if the State is equal to the empty State.
func (state State) IsEmpty() bool {
return state.Validators == nil // XXX can't compare to Empty
}
//ToProto takes the local state type and returns the equivalent proto type
func (state *State) ToProto() (*tmstate.State, error) {
if state == nil {
return nil, errors.New("state is nil")
}
sm := new(tmstate.State)
sm.Version = state.Version
sm.ChainID = state.ChainID
sm.LastBlockHeight = state.LastBlockHeight
sm.LastBlockID = state.LastBlockID.ToProto()
sm.LastBlockTime = state.LastBlockTime
vals, err := state.Validators.ToProto()
if err != nil {
return nil, err
}
sm.Validators = vals
nVals, err := state.NextValidators.ToProto()
if err != nil {
return nil, err
}
sm.NextValidators = nVals
if state.LastBlockHeight >= 1 { // At Block 1 LastValidators is nil
lVals, err := state.LastValidators.ToProto()
if err != nil {
return nil, err
}
sm.LastValidators = lVals
}
sm.LastHeightValidatorsChanged = state.LastHeightValidatorsChanged
sm.ConsensusParams = state.ConsensusParams
sm.LastHeightConsensusParamsChanged = state.LastHeightConsensusParamsChanged
sm.LastResultsHash = state.LastResultsHash
sm.AppHash = state.AppHash
return sm, nil
}
// StateFromProto takes a state proto message & returns the local state type
func StateFromProto(pb *tmstate.State) (*State, error) { //nolint:golint
if pb == nil {
return nil, errors.New("nil State")
}
state := new(State)
state.Version = pb.Version
state.ChainID = pb.ChainID
bi, err := types.BlockIDFromProto(&pb.LastBlockID)
if err != nil {
return nil, err
}
state.LastBlockID = *bi
state.LastBlockHeight = pb.LastBlockHeight
state.LastBlockTime = pb.LastBlockTime
vals, err := types.ValidatorSetFromProto(pb.Validators)
if err != nil {
return nil, err
}
state.Validators = vals
nVals, err := types.ValidatorSetFromProto(pb.NextValidators)
if err != nil {
return nil, err
}
state.NextValidators = nVals
if state.LastBlockHeight >= 1 { // At Block 1 LastValidators is nil
lVals, err := types.ValidatorSetFromProto(pb.LastValidators)
if err != nil {
return nil, err
}
state.LastValidators = lVals
} else {
state.LastValidators = types.NewValidatorSet(nil)
}
state.LastHeightValidatorsChanged = pb.LastHeightValidatorsChanged
state.ConsensusParams = pb.ConsensusParams
state.LastHeightConsensusParamsChanged = pb.LastHeightConsensusParamsChanged
state.LastResultsHash = pb.LastResultsHash
state.AppHash = pb.AppHash
return state, nil
}
//------------------------------------------------------------------------
// Create a block from the latest state
// MakeBlock builds a block from the current state with the given txs, commit,
// and evidence. Note it also takes a proposerAddress because the state does not
// track rounds, and hence does not know the correct proposer. TODO: fix this!
func (state State) MakeBlock(
height int64,
txs []types.Tx,
commit *types.Commit,
evidence []types.Evidence,
proposerAddress []byte,
) (*types.Block, *types.PartSet) {
// Build base block with block data.
block := types.MakeBlock(height, txs, commit, evidence)
// Set time.
var timestamp time.Time
if height == 1 {
timestamp = state.LastBlockTime // genesis time
} else {
timestamp = MedianTime(commit, state.LastValidators)
}
// Fill rest of header with state data.
block.Header.Populate(
state.Version.Consensus, state.ChainID,
timestamp, state.LastBlockID,
state.Validators.Hash(), state.NextValidators.Hash(),
types.HashConsensusParams(state.ConsensusParams), state.AppHash, state.LastResultsHash,
proposerAddress,
)
return block, block.MakePartSet(types.BlockPartSizeBytes)
}
// MedianTime computes a median time for a given Commit (based on Timestamp field of votes messages) and the
// corresponding validator set. The computed time is always between timestamps of
// the votes sent by honest processes, i.e., a faulty processes can not arbitrarily increase or decrease the
// computed value.
func MedianTime(commit *types.Commit, validators *types.ValidatorSet) time.Time {
weightedTimes := make([]*tmtime.WeightedTime, len(commit.Signatures))
totalVotingPower := int64(0)
for i, commitSig := range commit.Signatures {
if commitSig.Absent() {
continue
}
_, validator := validators.GetByAddress(commitSig.ValidatorAddress)
// If there's no condition, TestValidateBlockCommit panics; not needed normally.
if validator != nil {
totalVotingPower += validator.VotingPower
weightedTimes[i] = tmtime.NewWeightedTime(commitSig.Timestamp, validator.VotingPower)
}
}
return tmtime.WeightedMedian(weightedTimes, totalVotingPower)
}
//------------------------------------------------------------------------
// Genesis
// MakeGenesisStateFromFile reads and unmarshals state from the given
// file.
//
// Used during replay and in tests.
func MakeGenesisStateFromFile(genDocFile string) (State, error) {
genDoc, err := MakeGenesisDocFromFile(genDocFile)
if err != nil {
return State{}, err
}
return MakeGenesisState(genDoc)
}
// MakeGenesisDocFromFile reads and unmarshals genesis doc from the given file.
func MakeGenesisDocFromFile(genDocFile string) (*types.GenesisDoc, error) {
genDocJSON, err := ioutil.ReadFile(genDocFile)
if err != nil {
return nil, fmt.Errorf("couldn't read GenesisDoc file: %v", err)
}
genDoc, err := types.GenesisDocFromJSON(genDocJSON)
if err != nil {
return nil, fmt.Errorf("error reading GenesisDoc: %v", err)
}
return genDoc, nil
}
// MakeGenesisState creates state from types.GenesisDoc.
func MakeGenesisState(genDoc *types.GenesisDoc) (State, error) {
err := genDoc.ValidateAndComplete()
if err != nil {
return State{}, fmt.Errorf("error in genesis file: %v", err)
}
var validatorSet, nextValidatorSet *types.ValidatorSet
if genDoc.Validators == nil {
validatorSet = types.NewValidatorSet(nil)
nextValidatorSet = types.NewValidatorSet(nil)
} else {
validators := make([]*types.Validator, len(genDoc.Validators))
for i, val := range genDoc.Validators {
validators[i] = types.NewValidator(val.PubKey, val.Power)
}
validatorSet = types.NewValidatorSet(validators)
nextValidatorSet = types.NewValidatorSet(validators).CopyIncrementProposerPriority(1)
}
return State{
Version: InitStateVersion,
ChainID: genDoc.ChainID,
LastBlockHeight: 0,
LastBlockID: types.BlockID{},
LastBlockTime: genDoc.GenesisTime,
NextValidators: nextValidatorSet,
Validators: validatorSet,
LastValidators: types.NewValidatorSet(nil),
LastHeightValidatorsChanged: 1,
ConsensusParams: *genDoc.ConsensusParams,
LastHeightConsensusParamsChanged: 1,
AppHash: genDoc.AppHash,
}, nil
}