[state] expose ChainID and Params

```
jaekwon
Yeah we should definitely expose ChainID.
ConsensusParams is small enough, we can just write it.
```
https://github.com/tendermint/tendermint/pull/676#discussion_r144123203

blockchain/reactor.go

@@ -175,7 +175,7 @@ func (bcR *BlockchainReactor) Receive(chID byte, src p2p.Peer, msgBytes []byte)
 // maxMsgSize returns the maximum allowable size of a
 // message on the blockchain reactor.
 func (bcR *BlockchainReactor) maxMsgSize() int {
-	return bcR.state.Params().BlockSizeParams.MaxBytes + 2
+	return bcR.state.Params.BlockSizeParams.MaxBytes + 2
 }
 
 // Handle messages from the poolReactor telling the reactor what to do.
@@ -187,7 +187,7 @@ func (bcR *BlockchainReactor) poolRoutine() {
 	statusUpdateTicker := time.NewTicker(statusUpdateIntervalSeconds * time.Second)
 	switchToConsensusTicker := time.NewTicker(switchToConsensusIntervalSeconds * time.Second)
 
-	chainID := bcR.state.ChainID()
+	chainID := bcR.state.ChainID
 
 FOR_LOOP:
 	for {
@@ -238,7 +238,7 @@ FOR_LOOP:
 					// We need both to sync the first block.
 					break SYNC_LOOP
 				}
-				firstParts := first.MakePartSet(bcR.state.Params().BlockPartSizeBytes)
+				firstParts := first.MakePartSet(bcR.state.Params.BlockPartSizeBytes)
 				firstPartsHeader := firstParts.Header()
 				// Finally, verify the first block using the second's commit
 				// NOTE: we can probably make this more efficient, but note that calling

blockchain/reactor_test.go

@@ -42,7 +42,7 @@ func newBlockchainReactor(logger log.Logger, maxBlockHeight int) *BlockchainReac
 	for blockHeight := 1; blockHeight <= maxBlockHeight; blockHeight++ {
 		firstBlock := makeBlock(blockHeight, state)
 		secondBlock := makeBlock(blockHeight+1, state)
-		firstParts := firstBlock.MakePartSet(state.Params().BlockGossipParams.BlockPartSizeBytes)
+		firstParts := firstBlock.MakePartSet(state.Params.BlockGossipParams.BlockPartSizeBytes)
 		blockStore.SaveBlock(firstBlock, firstParts, secondBlock.LastCommit)
 	}
 
@@ -113,7 +113,7 @@ func makeBlock(blockNumber int, state *sm.State) *types.Block {
 	valHash := state.Validators.Hash()
 	prevBlockID := types.BlockID{prevHash, prevParts}
 	block, _ := types.MakeBlock(blockNumber, "test_chain", makeTxs(blockNumber),
-		new(types.Commit), prevBlockID, valHash, state.AppHash, state.Params().BlockGossipParams.BlockPartSizeBytes)
+		new(types.Commit), prevBlockID, valHash, state.AppHash, state.Params.BlockGossipParams.BlockPartSizeBytes)
 	return block
 }
 

consensus/byzantine_test.go

@@ -167,13 +167,13 @@ func byzantineDecideProposalFunc(t *testing.T, height, round int, cs *ConsensusS
 	block1, blockParts1 := cs.createProposalBlock()
 	polRound, polBlockID := cs.Votes.POLInfo()
 	proposal1 := types.NewProposal(height, round, blockParts1.Header(), polRound, polBlockID)
-	cs.privValidator.SignProposal(cs.state.ChainID(), proposal1) // byzantine doesnt err
+	cs.privValidator.SignProposal(cs.state.ChainID, proposal1) // byzantine doesnt err
 
 	// Create a new proposal block from state/txs from the mempool.
 	block2, blockParts2 := cs.createProposalBlock()
 	polRound, polBlockID = cs.Votes.POLInfo()
 	proposal2 := types.NewProposal(height, round, blockParts2.Header(), polRound, polBlockID)
-	cs.privValidator.SignProposal(cs.state.ChainID(), proposal2) // byzantine doesnt err
+	cs.privValidator.SignProposal(cs.state.ChainID, proposal2) // byzantine doesnt err
 
 	block1Hash := block1.Hash()
 	block2Hash := block2.Hash()

consensus/replay_test.go

@@ -231,7 +231,7 @@ func TestWALCrashBeforeWritePropose(t *testing.T) {
 		msg := readTimedWALMessage(t, proposalMsg)
 		proposal := msg.Msg.(msgInfo).Msg.(*ProposalMessage)
 		// Set LastSig
-		toPV(cs.privValidator).LastSignBytes = types.SignBytes(cs.state.ChainID(), proposal.Proposal)
+		toPV(cs.privValidator).LastSignBytes = types.SignBytes(cs.state.ChainID, proposal.Proposal)
 		toPV(cs.privValidator).LastSignature = proposal.Proposal.Signature
 		runReplayTest(t, cs, walFile, newBlockCh, thisCase, lineNum)
 	}
@@ -256,7 +256,7 @@ func testReplayCrashBeforeWriteVote(t *testing.T, thisCase *testCase, lineNum in
 		msg := readTimedWALMessage(t, voteMsg)
 		vote := msg.Msg.(msgInfo).Msg.(*VoteMessage)
 		// Set LastSig
-		toPV(cs.privValidator).LastSignBytes = types.SignBytes(cs.state.ChainID(), vote.Vote)
+		toPV(cs.privValidator).LastSignBytes = types.SignBytes(cs.state.ChainID, vote.Vote)
 		toPV(cs.privValidator).LastSignature = vote.Vote.Signature
 	})
 	runReplayTest(t, cs, walFile, newBlockCh, thisCase, lineNum)
@@ -382,7 +382,7 @@ func testHandshakeReplay(t *testing.T, nBlocks int, mode uint) {
 }
 
 func applyBlock(st *sm.State, blk *types.Block, proxyApp proxy.AppConns) {
-	testPartSize := st.Params().BlockPartSizeBytes
+	testPartSize := st.Params.BlockPartSizeBytes
 	err := st.ApplyBlock(nil, proxyApp.Consensus(), blk, blk.MakePartSet(testPartSize).Header(), mempool)
 	if err != nil {
 		panic(err)
@@ -562,7 +562,7 @@ func stateAndStore(config *cfg.Config, pubKey crypto.PubKey) (*sm.State, *mockBl
 	state, _ := sm.MakeGenesisStateFromFile(stateDB, config.GenesisFile())
 	state.SetLogger(log.TestingLogger().With("module", "state"))
 
-	store := NewMockBlockStore(config, state.Params())
+	store := NewMockBlockStore(config, *state.Params)
 	return state, store
 }
 

consensus/state.go

@@ -390,7 +390,7 @@ func (cs *ConsensusState) reconstructLastCommit(state *sm.State) {
 		return
 	}
 	seenCommit := cs.blockStore.LoadSeenCommit(state.LastBlockHeight)
-	lastPrecommits := types.NewVoteSet(state.ChainID(), state.LastBlockHeight, seenCommit.Round(), types.VoteTypePrecommit, state.LastValidators)
+	lastPrecommits := types.NewVoteSet(state.ChainID, state.LastBlockHeight, seenCommit.Round(), types.VoteTypePrecommit, state.LastValidators)
 	for _, precommit := range seenCommit.Precommits {
 		if precommit == nil {
 			continue
@@ -707,7 +707,7 @@ func (cs *ConsensusState) proposalHeartbeat(height, round int) {
 		// not a validator
 		valIndex = -1
 	}
-	chainID := cs.state.ChainID()
+	chainID := cs.state.ChainID
 	for {
 		rs := cs.GetRoundState()
 		// if we've already moved on, no need to send more heartbeats
@@ -798,7 +798,7 @@ func (cs *ConsensusState) defaultDecideProposal(height, round int) {
 	// Make proposal
 	polRound, polBlockID := cs.Votes.POLInfo()
 	proposal := types.NewProposal(height, round, blockParts.Header(), polRound, polBlockID)
-	if err := cs.privValidator.SignProposal(cs.state.ChainID(), proposal); err == nil {
+	if err := cs.privValidator.SignProposal(cs.state.ChainID, proposal); err == nil {
 		// Set fields
 		/*  fields set by setProposal and addBlockPart
 		cs.Proposal = proposal
@@ -857,9 +857,9 @@ func (cs *ConsensusState) createProposalBlock() (block *types.Block, blockParts
 
 	// Mempool validated transactions
 	txs := cs.mempool.Reap(cs.config.MaxBlockSizeTxs)
-	return types.MakeBlock(cs.Height, cs.state.ChainID(), txs, commit,
+	return types.MakeBlock(cs.Height, cs.state.ChainID, txs, commit,
 		cs.state.LastBlockID, cs.state.Validators.Hash(),
-		cs.state.AppHash, cs.state.Params().BlockPartSizeBytes)
+		cs.state.AppHash, cs.state.Params.BlockPartSizeBytes)
 }
 
 // Enter: `timeoutPropose` after entering Propose.
@@ -1263,7 +1263,7 @@ func (cs *ConsensusState) defaultSetProposal(proposal *types.Proposal) error {
 	}
 
 	// Verify signature
-	if !cs.Validators.GetProposer().PubKey.VerifyBytes(types.SignBytes(cs.state.ChainID(), proposal), proposal.Signature) {
+	if !cs.Validators.GetProposer().PubKey.VerifyBytes(types.SignBytes(cs.state.ChainID, proposal), proposal.Signature) {
 		return ErrInvalidProposalSignature
 	}
 
@@ -1294,7 +1294,7 @@ func (cs *ConsensusState) addProposalBlockPart(height int, part *types.Part, ver
 		var n int
 		var err error
 		cs.ProposalBlock = wire.ReadBinary(&types.Block{}, cs.ProposalBlockParts.GetReader(),
-			cs.state.Params().BlockSizeParams.MaxBytes, &n, &err).(*types.Block)
+			cs.state.Params.BlockSizeParams.MaxBytes, &n, &err).(*types.Block)
 		// NOTE: it's possible to receive complete proposal blocks for future rounds without having the proposal
 		cs.Logger.Info("Received complete proposal block", "height", cs.ProposalBlock.Height, "hash", cs.ProposalBlock.Hash())
 		if cs.Step == cstypes.RoundStepPropose && cs.isProposalComplete() {
@@ -1458,7 +1458,7 @@ func (cs *ConsensusState) signVote(type_ byte, hash []byte, header types.PartSet
 		Type:             type_,
 		BlockID:          types.BlockID{hash, header},
 	}
-	err := cs.privValidator.SignVote(cs.state.ChainID(), vote)
+	err := cs.privValidator.SignVote(cs.state.ChainID, vote)
 	return vote, err
 }
 

consensus/state_test.go

@@ -181,7 +181,7 @@ func TestBadProposal(t *testing.T) {
 	height, round := cs1.Height, cs1.Round
 	vs2 := vss[1]
 
-	partSize := cs1.state.Params().BlockPartSizeBytes
+	partSize := cs1.state.Params.BlockPartSizeBytes
 
 	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
 	voteCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringVote(), 1)
@@ -328,7 +328,7 @@ func TestLockNoPOL(t *testing.T) {
 	vs2 := vss[1]
 	height := cs1.Height
 
-	partSize := cs1.state.Params().BlockPartSizeBytes
+	partSize := cs1.state.Params.BlockPartSizeBytes
 
 	timeoutProposeCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutPropose(), 1)
 	timeoutWaitCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutWait(), 1)
@@ -494,7 +494,7 @@ func TestLockPOLRelock(t *testing.T) {
 	cs1, vss := randConsensusState(4)
 	vs2, vs3, vs4 := vss[1], vss[2], vss[3]
 
-	partSize := cs1.state.Params().BlockPartSizeBytes
+	partSize := cs1.state.Params.BlockPartSizeBytes
 
 	timeoutProposeCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutPropose(), 1)
 	timeoutWaitCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutWait(), 1)
@@ -607,7 +607,7 @@ func TestLockPOLUnlock(t *testing.T) {
 	cs1, vss := randConsensusState(4)
 	vs2, vs3, vs4 := vss[1], vss[2], vss[3]
 
-	partSize := cs1.state.Params().BlockPartSizeBytes
+	partSize := cs1.state.Params.BlockPartSizeBytes
 
 	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
 	timeoutProposeCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutPropose(), 1)
@@ -702,7 +702,7 @@ func TestLockPOLSafety1(t *testing.T) {
 	cs1, vss := randConsensusState(4)
 	vs2, vs3, vs4 := vss[1], vss[2], vss[3]
 
-	partSize := cs1.state.Params().BlockPartSizeBytes
+	partSize := cs1.state.Params.BlockPartSizeBytes
 
 	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
 	timeoutProposeCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutPropose(), 1)
@@ -823,7 +823,7 @@ func TestLockPOLSafety2(t *testing.T) {
 	cs1, vss := randConsensusState(4)
 	vs2, vs3, vs4 := vss[1], vss[2], vss[3]
 
-	partSize := cs1.state.Params().BlockPartSizeBytes
+	partSize := cs1.state.Params.BlockPartSizeBytes
 
 	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
 	timeoutProposeCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutPropose(), 1)
@@ -998,7 +998,7 @@ func TestHalt1(t *testing.T) {
 	cs1, vss := randConsensusState(4)
 	vs2, vs3, vs4 := vss[1], vss[2], vss[3]
 
-	partSize := cs1.state.Params().BlockPartSizeBytes
+	partSize := cs1.state.Params.BlockPartSizeBytes
 
 	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
 	timeoutWaitCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutWait(), 1)

node/node.go

@@ -145,9 +145,6 @@ func NewNode(config *cfg.Config,
 			return nil, err
 		}
 		state.Save()
-	} else {
-		state.SetChainID(genDoc.ChainID)
-		state.SetParams(genDoc.ConsensusParams)
 	}
 	state.SetLogger(stateLogger)
 
@@ -163,8 +160,6 @@ func NewNode(config *cfg.Config,
 
 	// reload the state (it may have been updated by the handshake)
 	state = sm.LoadState(stateDB)
-	state.SetChainID(genDoc.ChainID)
-	state.SetParams(genDoc.ConsensusParams)
 	state.SetLogger(stateLogger)
 
 	// Transaction indexing

state/execution.go

@@ -179,9 +179,8 @@ func (s *State) ValidateBlock(block *types.Block) error {
 }
 
 func (s *State) validateBlock(block *types.Block) error {
-	chainID := s.ChainID()
 	// Basic block validation.
-	err := block.ValidateBasic(chainID, s.LastBlockHeight, s.LastBlockID, s.LastBlockTime, s.AppHash)
+	err := block.ValidateBasic(s.ChainID, s.LastBlockHeight, s.LastBlockID, s.LastBlockTime, s.AppHash)
 	if err != nil {
 		return err
 	}
@@ -197,7 +196,7 @@ func (s *State) validateBlock(block *types.Block) error {
 				s.LastValidators.Size(), len(block.LastCommit.Precommits)))
 		}
 		err := s.LastValidators.VerifyCommit(
-			chainID, s.LastBlockID, block.Height-1, block.LastCommit)
+			s.ChainID, s.LastBlockID, block.Height-1, block.LastCommit)
 		if err != nil {
 			return err
 		}

state/state.go

@@ -39,9 +39,10 @@ type State struct {
 	db  dbm.DB
 
 	// See https://github.com/tendermint/tendermint/issues/671.
-	chainID string
-
-	params *types.ConsensusParams
+	ChainID string
+	// consensus parameters used for validating blocks
+	// must not be nil
+	Params *types.ConsensusParams
 
 	// These fields are updated by SetBlockAndValidators.
 	// LastBlockHeight=0 at genesis (ie. block(H=0) does not exist)
@@ -70,21 +71,14 @@ type State struct {
 // or creates a new one from the given genesisFile and persists the result
 // to the database.
 func GetState(stateDB dbm.DB, genesisFile string) (*State, error) {
-	var err error
-	genDoc, err := MakeGenesisDocFromFile(genesisFile)
-	if err != nil {
-		return nil, err
-	}
 	state := LoadState(stateDB)
 	if state == nil {
-		state, err = MakeGenesisState(stateDB, genDoc)
+		var err error
+		state, err = MakeGenesisStateFromFile(stateDB, genesisFile)
 		if err != nil {
 			return nil, err
 		}
 		state.Save()
-	} else {
-		state.SetChainID(genDoc.ChainID)
-		state.SetParams(genDoc.ConsensusParams)
 	}
 
 	return state, nil
@@ -119,7 +113,7 @@ func (s *State) SetLogger(l log.Logger) {
 
 // Copy makes a copy of the State for mutating.
 func (s *State) Copy() *State {
-	paramsCopy := *s.params
+	paramsCopy := *s.Params
 	return &State{
 		db:                          s.db,
 		LastBlockHeight:             s.LastBlockHeight,
@@ -131,17 +125,17 @@ func (s *State) Copy() *State {
 		TxIndexer:                   s.TxIndexer, // pointer here, not value
 		LastHeightValidatorsChanged: s.LastHeightValidatorsChanged,
 		logger:  s.logger,
-		chainID: s.chainID,
-		params:  &paramsCopy,
+		ChainID: s.ChainID,
+		Params:  &paramsCopy,
 	}
 }
 
 // Save persists the State to the database.
 func (s *State) Save() {
 	s.mtx.Lock()
+	defer s.mtx.Unlock()
 	s.saveValidatorsInfo()
 	s.db.SetSync(stateKey, s.Bytes())
-	s.mtx.Unlock()
 }
 
 // SaveABCIResponses persists the ABCIResponses to the database.
@@ -273,28 +267,6 @@ func (s *State) GetValidators() (*types.ValidatorSet, *types.ValidatorSet) {
 	return s.LastValidators, s.Validators
 }
 
-// ChainID returns the chain ID.
-func (s *State) ChainID() string {
-	return s.chainID
-}
-
-// SetChainID sets the chain ID.
-func (s *State) SetChainID(chainID string) {
-	s.chainID = chainID
-}
-
-// Params returns the consensus parameters used for
-// validating blocks.
-func (s *State) Params() types.ConsensusParams {
-	return *s.params
-}
-
-// SetParams sets the consensus parameters used for
-// validating blocks.
-func (s *State) SetParams(params *types.ConsensusParams) {
-	s.params = params
-}
-
 //------------------------------------------------------------------------
 
 // ABCIResponses retains the responses of the various ABCI calls during block processing.
@@ -364,8 +336,6 @@ func MakeGenesisDocFromFile(genDocFile string) (*types.GenesisDoc, error) {
 }
 
 // MakeGenesisState creates state from types.GenesisDoc.
-//
-// Used in tests.
 func MakeGenesisState(db dbm.DB, genDoc *types.GenesisDoc) (*State, error) {
 	err := genDoc.ValidateAndComplete()
 	if err != nil {
@@ -389,8 +359,8 @@ func MakeGenesisState(db dbm.DB, genDoc *types.GenesisDoc) (*State, error) {
 	return &State{
 		db: db,
 
-		chainID: genDoc.ChainID,
-		params:  genDoc.ConsensusParams,
+		ChainID: genDoc.ChainID,
+		Params:  genDoc.ConsensusParams,
 
 		LastBlockHeight:             0,
 		LastBlockID:                 types.BlockID{},

state/state_test.go

@@ -116,22 +116,6 @@ func TestValidatorSimpleSaveLoad(t *testing.T) {
 	assert.IsType(ErrNoValSetForHeight{}, err, "expected err at unknown height")
 }
 
-func TestChainID(t *testing.T) {
-	tearDown, _, state := setupTestCase(t)
-	defer tearDown(t)
-
-	state.SetChainID("test")
-	assert.Equal(t, "test", state.ChainID())
-}
-
-func TestParams(t *testing.T) {
-	tearDown, _, state := setupTestCase(t)
-	defer tearDown(t)
-
-	state.SetParams(&types.ConsensusParams{})
-	assert.Equal(t, types.ConsensusParams{}, state.Params())
-}
-
 func TestValidatorChangesSaveLoad(t *testing.T) {
 	tearDown, _, state := setupTestCase(t)
 	defer tearDown(t)