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175 lines
4.4 KiB
175 lines
4.4 KiB
package state
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import (
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"bytes"
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"io/ioutil"
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"sync"
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"time"
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. "github.com/tendermint/go-common"
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cfg "github.com/tendermint/go-config"
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dbm "github.com/tendermint/go-db"
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"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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)
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//-----------------------------------------------------------------------------
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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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// should not change
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GenesisDoc *types.GenesisDoc
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ChainID string
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// updated at end of ExecBlock
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LastBlockHeight int // Genesis state has this set to 0. So, Block(H=0) does not exist.
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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 // block.LastCommit validated against this
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// AppHash is updated after Commit;
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// it's stale after ExecBlock and before Commit
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Stale bool
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AppHash []byte
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valAddedOrRemoved bool // true if a validator was added or removed
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}
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func LoadState(db dbm.DB) *State {
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s := &State{db: db}
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buf := db.Get(stateKey)
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if len(buf) == 0 {
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return nil
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} else {
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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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Exit(Fmt("Data has been corrupted or its spec has changed: %v\n", *err))
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}
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// TODO: ensure that buf is completely read.
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}
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return s
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}
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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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GenesisDoc: s.GenesisDoc,
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ChainID: s.ChainID,
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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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Stale: s.Stale, // XXX: but really state shouldnt be copied while its stale
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AppHash: s.AppHash,
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}
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}
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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.db.Set(stateKey, s.Bytes())
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}
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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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func (s *State) Bytes() []byte {
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buf, n, err := new(bytes.Buffer), new(int), new(error)
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wire.WriteBinary(s, buf, n, err)
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if *err != nil {
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PanicCrisis(*err)
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}
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return buf.Bytes()
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}
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// Mutate state variables to match block and validators
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// Since we don't have the new AppHash yet, we set s.Stale=true
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func (s *State) SetBlockAndValidators(header *types.Header, blockPartsHeader types.PartSetHeader, prevValSet, nextValSet *types.ValidatorSet) {
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s.LastBlockHeight = header.Height
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s.LastBlockID = types.BlockID{header.Hash(), blockPartsHeader}
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s.LastBlockTime = header.Time
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s.Validators = nextValSet
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s.LastValidators = prevValSet
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s.Stale = true
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}
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func (s *State) ValidatorAddedOrRemoved() bool {
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return s.valAddedOrRemoved
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}
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func (s *State) GetValidators() (*types.ValidatorSet, *types.ValidatorSet) {
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return s.LastValidators, s.Validators
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}
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// Load the most recent state from "state" db,
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// or create a new one (and save) from genesis.
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func GetState(config cfg.Config, stateDB dbm.DB) *State {
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state := LoadState(stateDB)
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if state == nil {
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state = MakeGenesisStateFromFile(stateDB, config.GetString("genesis_file"))
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state.Save()
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}
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return state
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}
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//-----------------------------------------------------------------------------
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// Genesis
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func MakeGenesisStateFromFile(db dbm.DB, genDocFile string) *State {
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genDocJSON, err := ioutil.ReadFile(genDocFile)
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if err != nil {
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Exit(Fmt("Couldn't read GenesisDoc file: %v", err))
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}
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genDoc := types.GenesisDocFromJSON(genDocJSON)
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return MakeGenesisState(db, genDoc)
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}
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func MakeGenesisState(db dbm.DB, genDoc *types.GenesisDoc) *State {
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if len(genDoc.Validators) == 0 {
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Exit(Fmt("The genesis file has no validators"))
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}
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if genDoc.GenesisTime.IsZero() {
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genDoc.GenesisTime = time.Now()
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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.Amount,
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}
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}
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return &State{
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db: db,
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GenesisDoc: genDoc,
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ChainID: genDoc.ChainID,
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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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}
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}
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