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