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package state
import (
"bytes"
"fmt"
"io/ioutil"
"time"
"github.com/tendermint/tendermint/types"
tmtime "github.com/tendermint/tendermint/types/time"
)
// database keys
var (
stateKey = []byte("stateKey")
)
//-----------------------------------------------------------------------------
// 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 {
// immutable
ChainID string
// LastBlockHeight=0 at genesis (ie. block(H=0) does not exist)
LastBlockHeight int64
LastBlockTotalTx 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
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 types.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{
ChainID: state.ChainID,
LastBlockHeight: state.LastBlockHeight,
LastBlockTotalTx: state.LastBlockTotalTx,
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 go-amino.
func (state State) Bytes() []byte {
return cdc.MustMarshalBinaryBare(state)
}
// 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
}
//------------------------------------------------------------------------
// 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 doesn't know the correct proposer. TODO: alleviate 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)
// Fill rest of header with state data.
block.ChainID = state.ChainID
// Set time
if height == 1 {
block.Time = tmtime.Now()
if block.Time.Before(state.LastBlockTime) {
block.Time = state.LastBlockTime // state.LastBlockTime for height == 1 is genesis time
}
} else {
block.Time = MedianTime(commit, state.LastValidators)
}
block.LastBlockID = state.LastBlockID
block.TotalTxs = state.LastBlockTotalTx + block.NumTxs
block.ValidatorsHash = state.Validators.Hash()
block.NextValidatorsHash = state.NextValidators.Hash()
block.ConsensusHash = state.ConsensusParams.Hash()
block.AppHash = state.AppHash
block.LastResultsHash = state.LastResultsHash
// NOTE: we can't use the state.Validators because we don't
// IncrementAccum for rounds there.
block.ProposerAddress = 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.Precommits))
totalVotingPower := int64(0)
for i, vote := range commit.Precommits {
if vote != nil {
_, validator := validators.GetByIndex(vote.ValidatorIndex)
totalVotingPower += validator.VotingPower
weightedTimes[i] = tmtime.NewWeightedTime(vote.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)
}
// Make validators slice
validators := make([]*types.Validator, len(genDoc.Validators))
for i, val := range genDoc.Validators {
pubKey := val.PubKey
address := pubKey.Address()
// Make validator
validators[i] = &types.Validator{
Address: address,
PubKey: pubKey,
VotingPower: val.Power,
}
}
return State{
ChainID: genDoc.ChainID,
LastBlockHeight: 0,
LastBlockID: types.BlockID{},
LastBlockTime: genDoc.GenesisTime,
NextValidators: types.NewValidatorSet(validators).CopyIncrementAccum(1),
Validators: types.NewValidatorSet(validators),
LastValidators: types.NewValidatorSet(nil),
LastHeightValidatorsChanged: 1,
ConsensusParams: *genDoc.ConsensusParams,
LastHeightConsensusParamsChanged: 1,
AppHash: genDoc.AppHash,
}, nil
}