Merge pull request #994 from tendermint/clean/block-validation

Clean/block validation

blockchain/reactor.go

@@ -183,7 +183,7 @@ 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.BlockSize.MaxBytes + 2
+	return bcR.state.ConsensusParams.BlockSize.MaxBytes + 2
 }
 
 // Handle messages from the poolReactor telling the reactor what to do.
@@ -251,7 +251,7 @@ 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.ConsensusParams.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

@@ -41,7 +41,7 @@ func newBlockchainReactor(logger log.Logger, maxBlockHeight int64) *BlockchainRe
 	for blockHeight := int64(1); blockHeight <= maxBlockHeight; blockHeight++ {
 		firstBlock := makeBlock(blockHeight, state)
 		secondBlock := makeBlock(blockHeight+1, state)
-		firstParts := firstBlock.MakePartSet(state.Params.BlockGossip.BlockPartSizeBytes)
+		firstParts := firstBlock.MakePartSet(state.ConsensusParams.BlockGossip.BlockPartSizeBytes)
 		blockStore.SaveBlock(firstBlock, firstParts, secondBlock.LastCommit)
 	}
 
@@ -105,15 +105,7 @@ func makeTxs(height int64) (txs []types.Tx) {
 }
 
 func makeBlock(height int64, state *sm.State) *types.Block {
-	prevHash := state.LastBlockID.Hash
-	prevParts := types.PartSetHeader{}
-	valHash := state.Validators.Hash()
-	prevBlockID := types.BlockID{prevHash, prevParts}
-	block, _ := types.MakeBlock(height, "test_chain", makeTxs(height),
-		state.LastBlockTotalTx, new(types.Commit),
-		prevBlockID, valHash, state.AppHash,
-		state.LastConsensusHash,
-		state.Params.BlockGossip.BlockPartSizeBytes)
+	block, _ := state.MakeBlock(height, makeTxs(height), new(types.Commit))
 	return block
 }
 

circle.yml

@@ -25,7 +25,6 @@ dependencies:
 
 test:
   override:
-    - cd "$PROJECT_PATH" && make tools && make get_vendor_deps && make metalinter_test
     - cd "$PROJECT_PATH" && set -o pipefail && make test_integrations 2>&1 | tee test_integrations.log:
         timeout: 1800
   post:

consensus/replay_test.go

@@ -107,9 +107,9 @@ func TestWALCrash(t *testing.T) {
 		{"block with a smaller part size",
 			func(cs *ConsensusState, ctx context.Context) {
 				// XXX: is there a better way to change BlockPartSizeBytes?
-				params := cs.state.Params
+				params := cs.state.ConsensusParams
 				params.BlockPartSizeBytes = 512
-				cs.state.Params = params
+				cs.state.ConsensusParams = params
 				sendTxs(cs, ctx)
 			},
 			1},
@@ -392,7 +392,7 @@ 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.ConsensusParams.BlockPartSizeBytes
 	err := st.ApplyBlock(types.NopEventBus{}, proxyApp.Consensus(), blk, blk.MakePartSet(testPartSize).Header(), mempool)
 	if err != nil {
 		panic(err)
@@ -590,7 +590,7 @@ 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.ConsensusParams)
 	return state, store
 }
 

consensus/state.go

@@ -863,11 +863,7 @@ 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,
-		cs.state.LastBlockTotalTx, commit,
-		cs.state.LastBlockID, cs.state.Validators.Hash(),
-		cs.state.AppHash, cs.state.LastConsensusHash,
-		cs.state.Params.BlockPartSizeBytes)
+	return cs.state.MakeBlock(cs.Height, txs, commit)
 }
 
 // Enter: `timeoutPropose` after entering Propose.
@@ -1307,7 +1303,7 @@ func (cs *ConsensusState) addProposalBlockPart(height int64, part *types.Part, v
 		var n int
 		var err error
 		cs.ProposalBlock = wire.ReadBinary(&types.Block{}, cs.ProposalBlockParts.GetReader(),
-			cs.state.Params.BlockSize.MaxBytes, &n, &err).(*types.Block)
+			cs.state.ConsensusParams.BlockSize.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() {

consensus/state_test.go

@@ -184,7 +184,7 @@ func TestBadProposal(t *testing.T) {
 	height, round := cs1.Height, cs1.Round
 	vs2 := vss[1]
 
-	partSize := cs1.state.Params.BlockPartSizeBytes
+	partSize := cs1.state.ConsensusParams.BlockPartSizeBytes
 
 	proposalCh := subscribe(cs1.eventBus, types.EventQueryCompleteProposal)
 	voteCh := subscribe(cs1.eventBus, types.EventQueryVote)
@@ -339,7 +339,7 @@ func TestLockNoPOL(t *testing.T) {
 	vs2 := vss[1]
 	height := cs1.Height
 
-	partSize := cs1.state.Params.BlockPartSizeBytes
+	partSize := cs1.state.ConsensusParams.BlockPartSizeBytes
 
 	timeoutProposeCh := subscribe(cs1.eventBus, types.EventQueryTimeoutPropose)
 	timeoutWaitCh := subscribe(cs1.eventBus, types.EventQueryTimeoutWait)
@@ -507,7 +507,7 @@ 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.ConsensusParams.BlockPartSizeBytes
 
 	timeoutProposeCh := subscribe(cs1.eventBus, types.EventQueryTimeoutPropose)
 	timeoutWaitCh := subscribe(cs1.eventBus, types.EventQueryTimeoutWait)
@@ -622,7 +622,7 @@ 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.ConsensusParams.BlockPartSizeBytes
 
 	proposalCh := subscribe(cs1.eventBus, types.EventQueryCompleteProposal)
 	timeoutProposeCh := subscribe(cs1.eventBus, types.EventQueryTimeoutPropose)
@@ -719,7 +719,7 @@ 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.ConsensusParams.BlockPartSizeBytes
 
 	proposalCh := subscribe(cs1.eventBus, types.EventQueryCompleteProposal)
 	timeoutProposeCh := subscribe(cs1.eventBus, types.EventQueryTimeoutPropose)
@@ -842,7 +842,7 @@ 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.ConsensusParams.BlockPartSizeBytes
 
 	proposalCh := subscribe(cs1.eventBus, types.EventQueryCompleteProposal)
 	timeoutProposeCh := subscribe(cs1.eventBus, types.EventQueryTimeoutPropose)
@@ -1021,7 +1021,7 @@ 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.ConsensusParams.BlockPartSizeBytes
 
 	proposalCh := subscribe(cs1.eventBus, types.EventQueryCompleteProposal)
 	timeoutWaitCh := subscribe(cs1.eventBus, types.EventQueryTimeoutWait)

glide.lock

@@ -64,17 +64,19 @@ imports:
 - name: github.com/kr/logfmt
   version: b84e30acd515aadc4b783ad4ff83aff3299bdfe0
 - name: github.com/magiconair/properties
-  version: 49d762b9817ba1c2e9d0c69183c2b4a8b8f1d934
+  version: 8d7837e64d3c1ee4e54a880c5a920ab4316fc90a
 - name: github.com/mitchellh/mapstructure
   version: 06020f85339e21b2478f756a78e295255ffa4d6a
+- name: github.com/pelletier/go-buffruneio
+  version: c37440a7cf42ac63b919c752ca73a85067e05992
 - name: github.com/pelletier/go-toml
   version: b8b5e7696574464b2f9bf303a7b37781bb52889f
 - name: github.com/pkg/errors
   version: 645ef00459ed84a119197bfb8d8205042c6df63d
 - name: github.com/rcrowley/go-metrics
-  version: e181e095bae94582363434144c61a9653aff6e50
+  version: 1f30fe9094a513ce4c700b9a54458bbb0c96996c
 - name: github.com/spf13/afero
-  version: 8d919cbe7e2627e417f3e45c3c0e489a5b7e2536
+  version: 5660eeed305fe5f69c8fc6cf899132a459a97064
   subpackages:
   - mem
 - name: github.com/spf13/cast
@@ -129,7 +131,7 @@ imports:
   subpackages:
   - iavl
 - name: github.com/tendermint/tmlibs
-  version: e4ef2835f0081c2ece83b9c1f777cf071f956e81
+  version: e2d7f1aa41dde5f29057dd08e64371a574b84c86
   subpackages:
   - autofile
   - cli
@@ -201,7 +203,7 @@ imports:
 - name: gopkg.in/go-playground/validator.v9
   version: b1f51f36f1c98cc97f777d6fc9d4b05eaa0cabb5
 - name: gopkg.in/yaml.v2
-  version: 287cf08546ab5e7e37d55a84f7ed3fd1db036de5
+  version: eb3733d160e74a9c7e442f435eb3bea458e1d19f
 testImports:
 - name: github.com/davecgh/go-spew
   version: 04cdfd42973bb9c8589fd6a731800cf222fde1a9

glide.yaml

@@ -34,7 +34,7 @@ import:
   subpackages:
   - iavl
 - package: github.com/tendermint/tmlibs
-  version: e4ef2835f0081c2ece83b9c1f777cf071f956e81
+  version: develop
   subpackages:
   - autofile
   - cli

rpc/test/helpers.go

@@ -3,7 +3,6 @@ package rpctest
 import (
 	"context"
 	"fmt"
-	"math/rand"
 	"os"
 	"path/filepath"
 	"strings"
@@ -11,6 +10,8 @@ import (
 	"github.com/tendermint/tmlibs/log"
 
 	abci "github.com/tendermint/abci/types"
+	cmn "github.com/tendermint/tmlibs/common"
+
 	cfg "github.com/tendermint/tendermint/config"
 	nm "github.com/tendermint/tendermint/node"
 	"github.com/tendermint/tendermint/proxy"
@@ -57,9 +58,7 @@ func makePathname() string {
 }
 
 func randPort() int {
-	// returns between base and base + spread
-	base, spread := 20000, 20000
-	return base + rand.Intn(spread)
+	return int(cmn.RandUint16()/2 + 10000)
 }
 
 func makeAddrs() (string, string, string) {

state/errors.go

@@ -37,6 +37,10 @@ type (
 	ErrNoValSetForHeight struct {
 		Height int64
 	}
+
+	ErrNoConsensusParamsForHeight struct {
+		Height int64
+	}
 )
 
 func (e ErrUnknownBlock) Error() string {
@@ -61,3 +65,7 @@ func (e ErrStateMismatch) Error() string {
 func (e ErrNoValSetForHeight) Error() string {
 	return cmn.Fmt("Could not find validator set for height #%d", e.Height)
 }
+
+func (e ErrNoConsensusParamsForHeight) Error() string {
+	return cmn.Fmt("Could not find consensus params for height #%d", e.Height)
+}

state/execution.go

@@ -1,6 +1,7 @@
 package state
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
 
@@ -184,26 +185,69 @@ func (s *State) ValidateBlock(block *types.Block) error {
 	return s.validateBlock(block)
 }
 
-func (s *State) validateBlock(block *types.Block) error {
+// MakeBlock builds a block with the given txs and commit from the current state.
+func (s *State) MakeBlock(height int64, txs []types.Tx, commit *types.Commit) (*types.Block, *types.PartSet) {
+	// build base block
+	block := types.MakeBlock(height, txs, commit)
+
+	// fill header with state data
+	block.ChainID = s.ChainID
+	block.TotalTxs = s.LastBlockTotalTx + block.NumTxs
+	block.LastBlockID = s.LastBlockID
+	block.ValidatorsHash = s.Validators.Hash()
+	block.AppHash = s.AppHash
+	block.ConsensusHash = s.LastConsensusParams.Hash()
+
+	return block, block.MakePartSet(s.ConsensusParams.BlockGossip.BlockPartSizeBytes)
+}
+
+func (s *State) validateBlock(b *types.Block) error {
 	// Basic block validation.
-	err := block.ValidateBasic(s.ChainID, s.LastBlockHeight,
-		s.LastBlockTotalTx, s.LastBlockID, s.LastBlockTime, s.AppHash, s.LastConsensusHash)
-	if err != nil {
+	if err := b.ValidateBasic(); err != nil {
 		return err
 	}
 
+	if b.ChainID != s.ChainID {
+		return fmt.Errorf("Wrong Block.Header.ChainID. Expected %v, got %v", s.ChainID, b.ChainID)
+	}
+	if b.Height != s.LastBlockHeight+1 {
+		return fmt.Errorf("Wrong Block.Header.Height. Expected %v, got %v", s.LastBlockHeight+1, b.Height)
+	}
+	/*	TODO: Determine bounds for Time
+		See blockchain/reactor "stopSyncingDurationMinutes"
+
+		if !b.Time.After(lastBlockTime) {
+			return errors.New("Invalid Block.Header.Time")
+		}
+	*/
+
+	newTxs := int64(len(b.Data.Txs))
+	if b.TotalTxs != s.LastBlockTotalTx+newTxs {
+		return fmt.Errorf("Wrong Block.Header.TotalTxs. Expected %v, got %v", s.LastBlockTotalTx+newTxs, b.TotalTxs)
+	}
+	if !b.LastBlockID.Equals(s.LastBlockID) {
+		return fmt.Errorf("Wrong Block.Header.LastBlockID.  Expected %v, got %v", s.LastBlockID, b.LastBlockID)
+	}
+
+	if !bytes.Equal(b.AppHash, s.AppHash) {
+		return fmt.Errorf("Wrong Block.Header.AppHash.  Expected %X, got %v", s.AppHash, b.AppHash)
+	}
+	if !bytes.Equal(b.ConsensusHash, s.LastConsensusParams.Hash()) {
+		return fmt.Errorf("Wrong Block.Header.ConsensusHash.  Expected %X, got %v", s.LastConsensusParams.Hash(), b.ConsensusHash)
+	}
+
 	// Validate block LastCommit.
-	if block.Height == 1 {
-		if len(block.LastCommit.Precommits) != 0 {
+	if b.Height == 1 {
+		if len(b.LastCommit.Precommits) != 0 {
 			return errors.New("Block at height 1 (first block) should have no LastCommit precommits")
 		}
 	} else {
-		if len(block.LastCommit.Precommits) != s.LastValidators.Size() {
+		if len(b.LastCommit.Precommits) != s.LastValidators.Size() {
 			return errors.New(cmn.Fmt("Invalid block commit size. Expected %v, got %v",
-				s.LastValidators.Size(), len(block.LastCommit.Precommits)))
+				s.LastValidators.Size(), len(b.LastCommit.Precommits)))
 		}
 		err := s.LastValidators.VerifyCommit(
-			s.ChainID, s.LastBlockID, block.Height-1, block.LastCommit)
+			s.ChainID, s.LastBlockID, b.Height-1, b.LastCommit)
 		if err != nil {
 			return err
 		}
@@ -235,7 +279,10 @@ func (s *State) ApplyBlock(txEventPublisher types.TxEventPublisher, proxyAppConn
 	fail.Fail() // XXX
 
 	// now update the block and validators
-	s.SetBlockAndValidators(block.Header, partsHeader, abciResponses)
+	err = s.SetBlockAndValidators(block.Header, partsHeader, abciResponses)
+	if err != nil {
+		return fmt.Errorf("Commit failed for application: %v", err)
+	}
 
 	// lock mempool, commit state, update mempoool
 	err = s.CommitStateUpdateMempool(proxyAppConn, block, mempool)

state/execution_test.go

@@ -23,6 +23,52 @@ var (
 	nTxsPerBlock = 10
 )
 
+func TestValidateBlock(t *testing.T) {
+	state := state()
+	state.SetLogger(log.TestingLogger())
+
+	// proper block must pass
+	block := makeBlock(state, 1)
+	err := state.ValidateBlock(block)
+	require.NoError(t, err)
+
+	// wrong chain fails
+	block = makeBlock(state, 1)
+	block.ChainID = "not-the-real-one"
+	err = state.ValidateBlock(block)
+	require.Error(t, err)
+
+	// wrong height fails
+	block = makeBlock(state, 1)
+	block.Height += 10
+	err = state.ValidateBlock(block)
+	require.Error(t, err)
+
+	// wrong total tx fails
+	block = makeBlock(state, 1)
+	block.TotalTxs += 10
+	err = state.ValidateBlock(block)
+	require.Error(t, err)
+
+	// wrong blockid fails
+	block = makeBlock(state, 1)
+	block.LastBlockID.PartsHeader.Total += 10
+	err = state.ValidateBlock(block)
+	require.Error(t, err)
+
+	// wrong app hash fails
+	block = makeBlock(state, 1)
+	block.AppHash = []byte("wrong app hash")
+	err = state.ValidateBlock(block)
+	require.Error(t, err)
+
+	// wrong consensus hash fails
+	block = makeBlock(state, 1)
+	block.ConsensusHash = []byte("wrong consensus hash")
+	err = state.ValidateBlock(block)
+	require.Error(t, err)
+}
+
 func TestApplyBlock(t *testing.T) {
 	cc := proxy.NewLocalClientCreator(dummy.NewDummyApplication())
 	proxyApp := proxy.NewAppConns(cc, nil)
@@ -33,7 +79,7 @@ func TestApplyBlock(t *testing.T) {
 	state := state()
 	state.SetLogger(log.TestingLogger())
 
-	block := makeBlock(1, state)
+	block := makeBlock(state, 1)
 
 	err = state.ApplyBlock(types.NopEventBus{}, proxyApp.Consensus(), block, block.MakePartSet(testPartSize).Header(), types.MockMempool{})
 	require.Nil(t, err)
@@ -79,10 +125,7 @@ func TestBeginBlockAbsentValidators(t *testing.T) {
 	for _, tc := range testCases {
 		lastCommit := &types.Commit{BlockID: prevBlockID, Precommits: tc.lastCommitPrecommits}
 
-		valHash := state.Validators.Hash()
-		block, _ := types.MakeBlock(2, chainID, makeTxs(2), state.LastBlockTotalTx, lastCommit,
-			prevBlockID, valHash, state.AppHash, state.LastConsensusHash, testPartSize)
-
+		block, _ := state.MakeBlock(2, makeTxs(2), lastCommit)
 		_, err = ExecCommitBlock(proxyApp.Consensus(), block, log.TestingLogger(), lastValidators)
 		require.Nil(t, err, tc.desc)
 
@@ -112,15 +155,8 @@ func state() *State {
 	return s
 }
 
-func makeBlock(height int64, state *State) *types.Block {
-	prevHash := state.LastBlockID.Hash
-	prevParts := types.PartSetHeader{}
-	valHash := state.Validators.Hash()
-	prevBlockID := types.BlockID{prevHash, prevParts}
-	block, _ := types.MakeBlock(height, chainID,
-		makeTxs(height), state.LastBlockTotalTx,
-		new(types.Commit), prevBlockID, valHash,
-		state.AppHash, state.LastConsensusHash, testPartSize)
+func makeBlock(state *State, height int64) *types.Block {
+	block, _ := state.MakeBlock(height, makeTxs(state.LastBlockHeight), new(types.Commit))
 	return block
 }
 

state/state.go

@@ -18,6 +18,7 @@ import (
 	"github.com/tendermint/tendermint/types"
 )
 
+// database keys
 var (
 	stateKey         = []byte("stateKey")
 	abciResponsesKey = []byte("abciResponsesKey")
@@ -27,40 +28,51 @@ func calcValidatorsKey(height int64) []byte {
 	return []byte(cmn.Fmt("validatorsKey:%v", height))
 }
 
+func calcConsensusParamsKey(height int64) []byte {
+	return []byte(cmn.Fmt("consensusParamsKey:%v", height))
+}
+
 //-----------------------------------------------------------------------------
 
-// State represents the latest committed state of the Tendermint consensus,
-// including the last committed block and validator set.
-// Newly committed blocks are validated and executed against the State.
+// 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 the fields should only be changed by calling state.SetBlockAndValidators.
 // NOTE: not goroutine-safe.
 type State struct {
 	// mtx for writing to db
 	mtx sync.Mutex
 	db  dbm.DB
 
+	// Immutable
 	ChainID string
-	// Consensus parameters used for validating blocks
-	Params types.ConsensusParams
 
-	// These fields are updated by SetBlockAndValidators.
+	// Exposed fields are updated by SetBlockAndValidators.
+
 	// LastBlockHeight=0 at genesis (ie. block(H=0) does not exist)
-	// LastValidators is used to validate block.LastCommit.
 	LastBlockHeight  int64
 	LastBlockTotalTx int64
 	LastBlockID      types.BlockID
 	LastBlockTime    time.Time
-	Validators       *types.ValidatorSet
-	LastValidators   *types.ValidatorSet
-	// When a block returns a validator set change via EndBlock,
-	// the change only applies to the next block.
-	// So, if s.LastBlockHeight causes a valset change,
+
+	// 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
+	Validators                  *types.ValidatorSet
+	LastValidators              *types.ValidatorSet
 	LastHeightValidatorsChanged int64
 
-	// AppHash is updated after Commit
+	// Consensus parameters used for validating blocks.
+	// Changes returned by EndBlock and updated after Commit.
+	ConsensusParams                  types.ConsensusParams
+	LastConsensusParams              types.ConsensusParams
+	LastHeightConsensusParamsChanged int64
+
+	// The latest AppHash we've received from calling abci.Commit()
 	AppHash []byte
-	// LastConsensusHash is updated after Commit
-	LastConsensusHash []byte
 
 	logger log.Logger
 }
@@ -114,19 +126,26 @@ func (s *State) SetLogger(l log.Logger) {
 // Copy makes a copy of the State for mutating.
 func (s *State) Copy() *State {
 	return &State{
-		db:                          s.db,
-		LastBlockHeight:             s.LastBlockHeight,
-		LastBlockTotalTx:            s.LastBlockTotalTx,
-		LastBlockID:                 s.LastBlockID,
-		LastBlockTime:               s.LastBlockTime,
+		db: s.db,
+
+		ChainID: s.ChainID,
+
+		LastBlockHeight:  s.LastBlockHeight,
+		LastBlockTotalTx: s.LastBlockTotalTx,
+		LastBlockID:      s.LastBlockID,
+		LastBlockTime:    s.LastBlockTime,
+
 		Validators:                  s.Validators.Copy(),
 		LastValidators:              s.LastValidators.Copy(),
-		AppHash:                     s.AppHash,
-		LastConsensusHash:           s.LastConsensusHash,
 		LastHeightValidatorsChanged: s.LastHeightValidatorsChanged,
-		logger:  s.logger,
-		ChainID: s.ChainID,
-		Params:  s.Params,
+
+		ConsensusParams:                  s.ConsensusParams,
+		LastConsensusParams:              s.LastConsensusParams,
+		LastHeightConsensusParamsChanged: s.LastHeightConsensusParamsChanged,
+
+		AppHash: s.AppHash,
+
+		logger: s.logger,
 	}
 }
 
@@ -136,6 +155,7 @@ func (s *State) Save() {
 	defer s.mtx.Unlock()
 
 	s.saveValidatorsInfo()
+	s.saveConsensusParamsInfo()
 	s.db.SetSync(stateKey, s.Bytes())
 }
 
@@ -169,13 +189,13 @@ func (s *State) LoadABCIResponses() *ABCIResponses {
 
 // LoadValidators loads the ValidatorSet for a given height.
 func (s *State) LoadValidators(height int64) (*types.ValidatorSet, error) {
-	valInfo := s.loadValidators(height)
+	valInfo := s.loadValidatorsInfo(height)
 	if valInfo == nil {
 		return nil, ErrNoValSetForHeight{height}
 	}
 
 	if valInfo.ValidatorSet == nil {
-		valInfo = s.loadValidators(valInfo.LastHeightChanged)
+		valInfo = s.loadValidatorsInfo(valInfo.LastHeightChanged)
 		if valInfo == nil {
 			cmn.PanicSanity(fmt.Sprintf(`Couldn't find validators at height %d as
                         last changed from height %d`, valInfo.LastHeightChanged, height))
@@ -185,7 +205,7 @@ func (s *State) LoadValidators(height int64) (*types.ValidatorSet, error) {
 	return valInfo.ValidatorSet, nil
 }
 
-func (s *State) loadValidators(height int64) *ValidatorsInfo {
+func (s *State) loadValidatorsInfo(height int64) *ValidatorsInfo {
 	buf := s.db.Get(calcValidatorsKey(height))
 	if len(buf) == 0 {
 		return nil
@@ -220,6 +240,61 @@ func (s *State) saveValidatorsInfo() {
 	s.db.SetSync(calcValidatorsKey(nextHeight), valInfo.Bytes())
 }
 
+// LoadConsensusParams loads the ConsensusParams for a given height.
+func (s *State) LoadConsensusParams(height int64) (types.ConsensusParams, error) {
+	empty := types.ConsensusParams{}
+
+	paramsInfo := s.loadConsensusParamsInfo(height)
+	if paramsInfo == nil {
+		return empty, ErrNoConsensusParamsForHeight{height}
+	}
+
+	if paramsInfo.ConsensusParams == empty {
+		paramsInfo = s.loadConsensusParamsInfo(paramsInfo.LastHeightChanged)
+		if paramsInfo == nil {
+			cmn.PanicSanity(fmt.Sprintf(`Couldn't find consensus params at height %d as
+                        last changed from height %d`, paramsInfo.LastHeightChanged, height))
+		}
+	}
+
+	return paramsInfo.ConsensusParams, nil
+}
+
+func (s *State) loadConsensusParamsInfo(height int64) *ConsensusParamsInfo {
+	buf := s.db.Get(calcConsensusParamsKey(height))
+	if len(buf) == 0 {
+		return nil
+	}
+
+	paramsInfo := new(ConsensusParamsInfo)
+	r, n, err := bytes.NewReader(buf), new(int), new(error)
+	wire.ReadBinaryPtr(paramsInfo, r, 0, n, err)
+	if *err != nil {
+		// DATA HAS BEEN CORRUPTED OR THE SPEC HAS CHANGED
+		cmn.Exit(cmn.Fmt(`LoadConsensusParams: Data has been corrupted or its spec has changed:
+                %v\n`, *err))
+	}
+	// TODO: ensure that buf is completely read.
+
+	return paramsInfo
+}
+
+// saveConsensusParamsInfo persists the consensus params for the next block to disk.
+// It should be called from s.Save(), right before the state itself is persisted.
+// If the consensus params did not change after processing the latest block,
+// only the last height for which they changed is persisted.
+func (s *State) saveConsensusParamsInfo() {
+	changeHeight := s.LastHeightConsensusParamsChanged
+	nextHeight := s.LastBlockHeight + 1
+	paramsInfo := &ConsensusParamsInfo{
+		LastHeightChanged: changeHeight,
+	}
+	if changeHeight == nextHeight {
+		paramsInfo.ConsensusParams = s.ConsensusParams
+	}
+	s.db.SetSync(calcConsensusParamsKey(nextHeight), paramsInfo.Bytes())
+}
+
 // Equals returns true if the States are identical.
 func (s *State) Equals(s2 *State) bool {
 	return bytes.Equal(s.Bytes(), s2.Bytes())
@@ -233,7 +308,7 @@ func (s *State) Bytes() []byte {
 // SetBlockAndValidators mutates State variables
 // to update block and validators after running EndBlock.
 func (s *State) SetBlockAndValidators(header *types.Header, blockPartsHeader types.PartSetHeader,
-	abciResponses *ABCIResponses) {
+	abciResponses *ABCIResponses) error {
 
 	// copy the valset so we can apply changes from EndBlock
 	// and update s.LastValidators and s.Validators
@@ -244,8 +319,7 @@ func (s *State) SetBlockAndValidators(header *types.Header, blockPartsHeader typ
 	if len(abciResponses.EndBlock.ValidatorUpdates) > 0 {
 		err := updateValidators(nextValSet, abciResponses.EndBlock.ValidatorUpdates)
 		if err != nil {
-			s.logger.Error("Error changing validator set", "err", err)
-			// TODO: err or carry on?
+			return fmt.Errorf("Error changing validator set: %v", err)
 		}
 		// change results from this height but only applies to the next height
 		s.LastHeightValidatorsChanged = header.Height + 1
@@ -254,76 +328,43 @@ func (s *State) SetBlockAndValidators(header *types.Header, blockPartsHeader typ
 	// Update validator accums and set state variables
 	nextValSet.IncrementAccum(1)
 
-	nextParams := applyUpdates(s.Params,
-		abciResponses.EndBlock.ConsensusParamUpdates)
-	err := nextParams.Validate()
-	if err != nil {
-		s.logger.Error("Error updating consensus params", "err", err)
-		// TODO: err or carry on?
-		nextParams = s.Params
+	// update the params with the latest abciResponses
+	nextParams := s.ConsensusParams
+	if abciResponses.EndBlock.ConsensusParamUpdates != nil {
+		// NOTE: must not mutate s.ConsensusParams
+		nextParams = s.ConsensusParams.Update(abciResponses.EndBlock.ConsensusParamUpdates)
+		err := nextParams.Validate()
+		if err != nil {
+			return fmt.Errorf("Error updating consensus params: %v", err)
+		}
+		// change results from this height but only applies to the next height
+		s.LastHeightConsensusParamsChanged = header.Height + 1
 	}
 
 	s.setBlockAndValidators(header.Height,
 		header.NumTxs,
 		types.BlockID{header.Hash(), blockPartsHeader},
 		header.Time,
-		prevValSet, nextValSet,
+		nextValSet,
 		nextParams)
-
-}
-
-// applyUpdates returns new ConsensusParams
-// whose fields are set to any non-zero fields of c.
-// If c is nil, it returns p unmodified, as it was passed in.
-func applyUpdates(p types.ConsensusParams,
-	c *abci.ConsensusParams) types.ConsensusParams {
-
-	if c == nil {
-		return p
-	}
-	res := p
-	// we must defensively consider any structs may be nil
-	if c.BlockSize != nil {
-
-		if c.BlockSize.MaxBytes != 0 {
-			res.BlockSize.MaxBytes = int(c.BlockSize.MaxBytes)
-		}
-		if c.BlockSize.MaxTxs != 0 {
-			res.BlockSize.MaxTxs = int(c.BlockSize.MaxTxs)
-		}
-		if c.BlockSize.MaxGas != 0 {
-			res.BlockSize.MaxGas = int(c.BlockSize.MaxGas)
-		}
-	}
-	if c.TxSize != nil {
-		if c.TxSize.MaxBytes != 0 {
-			res.TxSize.MaxBytes = int(c.TxSize.MaxBytes)
-		}
-		if c.TxSize.MaxGas != 0 {
-			res.TxSize.MaxGas = int(c.TxSize.MaxGas)
-		}
-	}
-	if c.BlockGossip != nil {
-		if c.BlockGossip.BlockPartSizeBytes != 0 {
-			res.BlockGossip.BlockPartSizeBytes = int(c.BlockGossip.BlockPartSizeBytes)
-		}
-	}
-	return res
+	return nil
 }
 
 func (s *State) setBlockAndValidators(height int64,
 	newTxs int64, blockID types.BlockID, blockTime time.Time,
-	prevValSet, nextValSet *types.ValidatorSet,
-	nextParams types.ConsensusParams) {
+	valSet *types.ValidatorSet,
+	params types.ConsensusParams) {
 
 	s.LastBlockHeight = height
 	s.LastBlockTotalTx += newTxs
 	s.LastBlockID = blockID
 	s.LastBlockTime = blockTime
-	s.Validators = nextValSet
-	s.LastValidators = prevValSet
-	s.LastConsensusHash = s.Params.Hash()
-	s.Params = nextParams
+
+	s.LastValidators = s.Validators.Copy()
+	s.Validators = valSet
+
+	s.LastConsensusParams = s.ConsensusParams
+	s.ConsensusParams = params
 }
 
 // GetValidators returns the last and current validator sets.
@@ -371,6 +412,19 @@ func (valInfo *ValidatorsInfo) Bytes() []byte {
 	return wire.BinaryBytes(*valInfo)
 }
 
+//-----------------------------------------------------------------------------
+
+// ConsensusParamsInfo represents the latest consensus params, or the last height it changed
+type ConsensusParamsInfo struct {
+	ConsensusParams   types.ConsensusParams
+	LastHeightChanged int64
+}
+
+// Bytes serializes the ConsensusParamsInfo using go-wire
+func (params ConsensusParamsInfo) Bytes() []byte {
+	return wire.BinaryBytes(params)
+}
+
 //------------------------------------------------------------------------
 // Genesis
 
@@ -424,15 +478,19 @@ func MakeGenesisState(db dbm.DB, genDoc *types.GenesisDoc) (*State, error) {
 		db: db,
 
 		ChainID: genDoc.ChainID,
-		Params:  *genDoc.ConsensusParams,
 
-		LastBlockHeight:             0,
-		LastBlockID:                 types.BlockID{},
-		LastBlockTime:               genDoc.GenesisTime,
+		LastBlockHeight: 0,
+		LastBlockID:     types.BlockID{},
+		LastBlockTime:   genDoc.GenesisTime,
+
 		Validators:                  types.NewValidatorSet(validators),
 		LastValidators:              types.NewValidatorSet(nil),
-		AppHash:                     genDoc.AppHash,
-		LastConsensusHash:           genDoc.ConsensusParams.Hash(),
 		LastHeightValidatorsChanged: 1,
+
+		ConsensusParams:                  *genDoc.ConsensusParams,
+		LastConsensusParams:              types.ConsensusParams{},
+		LastHeightConsensusParamsChanged: 1,
+
+		AppHash: genDoc.AppHash,
 	}, nil
 }

state/state_test.go

@@ -76,7 +76,7 @@ func TestABCIResponsesSaveLoad(t *testing.T) {
 	state.LastBlockHeight++
 
 	// build mock responses
-	block := makeBlock(2, state)
+	block := makeBlock(state, 2)
 	abciResponses := NewABCIResponses(block)
 	abciResponses.DeliverTx[0] = &abci.ResponseDeliverTx{Data: []byte("foo"), Tags: []*abci.KVPair{}}
 	abciResponses.DeliverTx[1] = &abci.ResponseDeliverTx{Data: []byte("bar"), Log: "ok", Tags: []*abci.KVPair{}}
@@ -192,6 +192,65 @@ func TestValidatorChangesSaveLoad(t *testing.T) {
 	}
 }
 
+// TestConsensusParamsChangesSaveLoad tests saving and loading consensus params with changes.
+func TestConsensusParamsChangesSaveLoad(t *testing.T) {
+	tearDown, _, state := setupTestCase(t)
+	defer tearDown(t)
+	// nolint: vetshadow
+	assert := assert.New(t)
+
+	// change vals at these heights
+	changeHeights := []int64{1, 2, 4, 5, 10, 15, 16, 17, 20}
+	N := len(changeHeights)
+
+	// each valset is just one validator.
+	// create list of them
+	params := make([]types.ConsensusParams, N+1)
+	params[0] = state.ConsensusParams
+	for i := 1; i < N+1; i++ {
+		params[i] = *types.DefaultConsensusParams()
+		params[i].BlockSize.MaxBytes += i
+	}
+
+	// build the params history by running SetBlockAndValidators
+	// with the right params set for each height
+	highestHeight := changeHeights[N-1] + 5
+	changeIndex := 0
+	cp := params[changeIndex]
+	for i := int64(1); i < highestHeight; i++ {
+		// when we get to a change height,
+		// use the next params
+		if changeIndex < len(changeHeights) && i == changeHeights[changeIndex] {
+			changeIndex++
+			cp = params[changeIndex]
+		}
+		header, parts, responses := makeHeaderPartsResponsesParams(state, i, cp)
+		state.SetBlockAndValidators(header, parts, responses)
+		state.saveConsensusParamsInfo()
+	}
+
+	// make all the test cases by using the same params until after the change
+	testCases := make([]paramsChangeTestCase, highestHeight)
+	changeIndex = 0
+	cp = params[changeIndex]
+	for i := int64(1); i < highestHeight+1; i++ {
+		// we we get to the height after a change height
+		// use the next pubkey (note our counter starts at 0 this time)
+		if changeIndex < len(changeHeights) && i == changeHeights[changeIndex]+1 {
+			changeIndex++
+			cp = params[changeIndex]
+		}
+		testCases[i-1] = paramsChangeTestCase{i, cp}
+	}
+
+	for _, testCase := range testCases {
+		p, err := state.LoadConsensusParams(testCase.height)
+		assert.Nil(err, fmt.Sprintf("expected no err at height %d", testCase.height))
+		assert.Equal(testCase.params, p, fmt.Sprintf(`unexpected consensus params at
+                height %d`, testCase.height))
+	}
+}
+
 func makeParams(blockBytes, blockTx, blockGas, txBytes,
 	txGas, partSize int) types.ConsensusParams {
 
@@ -199,11 +258,11 @@ func makeParams(blockBytes, blockTx, blockGas, txBytes,
 		BlockSize: types.BlockSize{
 			MaxBytes: blockBytes,
 			MaxTxs:   blockTx,
-			MaxGas:   blockGas,
+			MaxGas:   int64(blockGas),
 		},
 		TxSize: types.TxSize{
 			MaxBytes: txBytes,
-			MaxGas:   txGas,
+			MaxGas:   int64(txGas),
 		},
 		BlockGossip: types.BlockGossip{
 			BlockPartSizeBytes: partSize,
@@ -252,7 +311,7 @@ func TestApplyUpdates(t *testing.T) {
 	}
 
 	for i, tc := range cases {
-		res := applyUpdates(tc.init, tc.updates)
+		res := tc.init.Update(tc.updates)
 		assert.Equal(t, tc.expected, res, "case %d", i)
 	}
 }
@@ -260,7 +319,7 @@ func TestApplyUpdates(t *testing.T) {
 func makeHeaderPartsResponses(state *State, height int64,
 	pubkey crypto.PubKey) (*types.Header, types.PartSetHeader, *ABCIResponses) {
 
-	block := makeBlock(height, state)
+	block := makeBlock(state, height)
 	_, val := state.Validators.GetByIndex(0)
 	abciResponses := &ABCIResponses{
 		Height:   height,
@@ -284,3 +343,19 @@ type valChangeTestCase struct {
 	height int64
 	vals   crypto.PubKey
 }
+
+func makeHeaderPartsResponsesParams(state *State, height int64,
+	params types.ConsensusParams) (*types.Header, types.PartSetHeader, *ABCIResponses) {
+
+	block := makeBlock(state, height)
+	abciResponses := &ABCIResponses{
+		Height:   height,
+		EndBlock: &abci.ResponseEndBlock{ConsensusParamUpdates: types.TM2PB.ConsensusParams(&params)},
+	}
+	return block.Header, types.PartSetHeader{}, abciResponses
+}
+
+type paramsChangeTestCase struct {
+	height int64
+	params types.ConsensusParams
+}

types/block.go

@@ -15,31 +15,21 @@ import (
 )
 
 // Block defines the atomic unit of a Tendermint blockchain.
+// TODO: add Version byte
 type Block struct {
 	*Header    `json:"header"`
 	*Data      `json:"data"`
 	LastCommit *Commit `json:"last_commit"`
 }
 
-// MakeBlock returns a new block and corresponding partset from the given information.
-// TODO: Add version information to the Block struct.
-func MakeBlock(height int64, chainID string, txs []Tx,
-	totalTxs int64, commit *Commit,
-	prevBlockID BlockID, valHash, appHash, consensusHash []byte,
-	partSize int) (*Block, *PartSet) {
-
-	newTxs := int64(len(txs))
+// MakeBlock returns a new block with an empty header, except what can be computed from itself.
+// It populates the same set of fields validated by ValidateBasic
+func MakeBlock(height int64, txs []Tx, commit *Commit) *Block {
 	block := &Block{
 		Header: &Header{
-			ChainID:        chainID,
-			Height:         height,
-			Time:           time.Now(),
-			NumTxs:         newTxs,
-			TotalTxs:       totalTxs + newTxs,
-			LastBlockID:    prevBlockID,
-			ValidatorsHash: valHash,
-			AppHash:        appHash, // state merkle root of txs from the previous block.
-			ConsensusHash:  consensusHash,
+			Height: height,
+			Time:   time.Now(),
+			NumTxs: int64(len(txs)),
 		},
 		LastCommit: commit,
 		Data: &Data{
@@ -47,37 +37,16 @@ func MakeBlock(height int64, chainID string, txs []Tx,
 		},
 	}
 	block.FillHeader()
-	return block, block.MakePartSet(partSize)
+	return block
 }
 
 // ValidateBasic performs basic validation that doesn't involve state data.
-func (b *Block) ValidateBasic(chainID string, lastBlockHeight int64,
-	lastBlockTotalTx int64, lastBlockID BlockID,
-	lastBlockTime time.Time, appHash, consensusHash []byte) error {
-
-	if b.ChainID != chainID {
-		return fmt.Errorf("Wrong Block.Header.ChainID. Expected %v, got %v", chainID, b.ChainID)
-	}
-	if b.Height != lastBlockHeight+1 {
-		return fmt.Errorf("Wrong Block.Header.Height. Expected %v, got %v", lastBlockHeight+1, b.Height)
-	}
-	/*	TODO: Determine bounds for Time
-		See blockchain/reactor "stopSyncingDurationMinutes"
-
-		if !b.Time.After(lastBlockTime) {
-			return errors.New("Invalid Block.Header.Time")
-		}
-	*/
+// It checks the internal consistency of the block.
+func (b *Block) ValidateBasic() error {
 	newTxs := int64(len(b.Data.Txs))
 	if b.NumTxs != newTxs {
 		return fmt.Errorf("Wrong Block.Header.NumTxs. Expected %v, got %v", newTxs, b.NumTxs)
 	}
-	if b.TotalTxs != lastBlockTotalTx+newTxs {
-		return fmt.Errorf("Wrong Block.Header.TotalTxs. Expected %v, got %v", lastBlockTotalTx+newTxs, b.TotalTxs)
-	}
-	if !b.LastBlockID.Equals(lastBlockID) {
-		return fmt.Errorf("Wrong Block.Header.LastBlockID.  Expected %v, got %v", lastBlockID, b.LastBlockID)
-	}
 	if !bytes.Equal(b.LastCommitHash, b.LastCommit.Hash()) {
 		return fmt.Errorf("Wrong Block.Header.LastCommitHash.  Expected %v, got %v", b.LastCommitHash, b.LastCommit.Hash())
 	}
@@ -89,13 +58,6 @@ func (b *Block) ValidateBasic(chainID string, lastBlockHeight int64,
 	if !bytes.Equal(b.DataHash, b.Data.Hash()) {
 		return fmt.Errorf("Wrong Block.Header.DataHash.  Expected %v, got %v", b.DataHash, b.Data.Hash())
 	}
-	if !bytes.Equal(b.AppHash, appHash) {
-		return fmt.Errorf("Wrong Block.Header.AppHash.  Expected %X, got %v", appHash, b.AppHash)
-	}
-	if !bytes.Equal(b.ConsensusHash, consensusHash) {
-		return fmt.Errorf("Wrong Block.Header.ConsensusHash.  Expected %X, got %v", consensusHash, b.ConsensusHash)
-	}
-	// NOTE: the AppHash and ValidatorsHash are validated later.
 	return nil
 }
 
@@ -171,18 +133,26 @@ func (b *Block) StringShort() string {
 //-----------------------------------------------------------------------------
 
 // Header defines the structure of a Tendermint block header
+// TODO: limit header size
 type Header struct {
-	ChainID        string     `json:"chain_id"`
-	Height         int64      `json:"height"`
-	Time           time.Time  `json:"time"`
-	NumTxs         int64      `json:"num_txs"` // XXX: Can we get rid of this?
-	TotalTxs       int64      `json:"total_txs"`
-	LastBlockID    BlockID    `json:"last_block_id"`
+	// basic block info
+	ChainID string    `json:"chain_id"`
+	Height  int64     `json:"height"`
+	Time    time.Time `json:"time"`
+	NumTxs  int64     `json:"num_txs"`
+
+	// prev block info
+	LastBlockID BlockID `json:"last_block_id"`
+	TotalTxs    int64   `json:"total_txs"`
+
+	// hashes of block data
 	LastCommitHash data.Bytes `json:"last_commit_hash"` // commit from validators from the last block
 	DataHash       data.Bytes `json:"data_hash"`        // transactions
-	ValidatorsHash data.Bytes `json:"validators_hash"`  // validators for the current block
-	AppHash        data.Bytes `json:"app_hash"`         // state after txs from the previous block
-	ConsensusHash  data.Bytes `json:"consensus_hash"`   // consensus params for current block
+
+	// hashes from the app
+	ValidatorsHash data.Bytes `json:"validators_hash"` // validators for the current block
+	ConsensusHash  data.Bytes `json:"consensus_hash"`  // consensus params for current block
+	AppHash        data.Bytes `json:"app_hash"`        // state after txs from the previous block
 }
 
 // Hash returns the hash of the header.

types/block_test.go

@@ -2,55 +2,59 @@ package types
 
 import (
 	"testing"
-	"time"
 
 	"github.com/stretchr/testify/require"
 	crypto "github.com/tendermint/go-crypto"
+	cmn "github.com/tendermint/tmlibs/common"
 )
 
 func TestValidateBlock(t *testing.T) {
 	txs := []Tx{Tx("foo"), Tx("bar")}
 	lastID := makeBlockID()
-	valHash := []byte("val")
-	appHash := []byte("app")
-	consensusHash := []byte("consensus-params")
 	h := int64(3)
 
 	voteSet, _, vals := randVoteSet(h-1, 1, VoteTypePrecommit,
 		10, 1)
-	commit, err := makeCommit(lastID, h-1, 1, voteSet, vals)
+	commit, err := MakeCommit(lastID, h-1, 1, voteSet, vals)
 	require.NoError(t, err)
 
-	block, _ := MakeBlock(h, "hello", txs, 10, commit,
-		lastID, valHash, appHash, consensusHash, 2)
+	block := MakeBlock(h, txs, commit)
 	require.NotNil(t, block)
 
 	// proper block must pass
-	err = block.ValidateBasic("hello", h-1, 10, lastID, block.Time, appHash, consensusHash)
+	err = block.ValidateBasic()
 	require.NoError(t, err)
 
-	// wrong chain fails
-	err = block.ValidateBasic("other", h-1, 10, lastID, block.Time, appHash, consensusHash)
+	// tamper with NumTxs
+	block = MakeBlock(h, txs, commit)
+	block.NumTxs += 1
+	err = block.ValidateBasic()
 	require.Error(t, err)
 
-	// wrong height fails
-	err = block.ValidateBasic("hello", h+4, 10, lastID, block.Time, appHash, consensusHash)
+	// remove 1/2 the commits
+	block = MakeBlock(h, txs, commit)
+	block.LastCommit.Precommits = commit.Precommits[:commit.Size()/2]
+	block.LastCommit.hash = nil // clear hash or change wont be noticed
+	err = block.ValidateBasic()
 	require.Error(t, err)
 
-	// wrong total tx fails
-	err = block.ValidateBasic("hello", h-1, 15, lastID, block.Time, appHash, consensusHash)
+	// tamper with LastCommitHash
+	block = MakeBlock(h, txs, commit)
+	block.LastCommitHash = []byte("something else")
+	err = block.ValidateBasic()
 	require.Error(t, err)
 
-	// wrong blockid fails
-	err = block.ValidateBasic("hello", h-1, 10, makeBlockID(), block.Time, appHash, consensusHash)
+	// tamper with data
+	block = MakeBlock(h, txs, commit)
+	block.Data.Txs[0] = Tx("something else")
+	block.Data.hash = nil // clear hash or change wont be noticed
+	err = block.ValidateBasic()
 	require.Error(t, err)
 
-	// wrong app hash fails
-	err = block.ValidateBasic("hello", h-1, 10, lastID, block.Time, []byte("bad-hash"), consensusHash)
-	require.Error(t, err)
-
-	// wrong consensus hash fails
-	err = block.ValidateBasic("hello", h-1, 10, lastID, block.Time, appHash, []byte("wrong-params"))
+	// tamper with DataHash
+	block = MakeBlock(h, txs, commit)
+	block.DataHash = cmn.RandBytes(len(block.DataHash))
+	err = block.ValidateBasic()
 	require.Error(t, err)
 }
 
@@ -58,29 +62,3 @@ func makeBlockID() BlockID {
 	blockHash, blockPartsHeader := crypto.CRandBytes(32), PartSetHeader{123, crypto.CRandBytes(32)}
 	return BlockID{blockHash, blockPartsHeader}
 }
-
-func makeCommit(blockID BlockID, height int64, round int,
-	voteSet *VoteSet,
-	validators []*PrivValidatorFS) (*Commit, error) {
-
-	voteProto := &Vote{
-		ValidatorAddress: nil,
-		ValidatorIndex:   -1,
-		Height:           height,
-		Round:            round,
-		Type:             VoteTypePrecommit,
-		BlockID:          blockID,
-		Timestamp:        time.Now().UTC(),
-	}
-
-	// all sign
-	for i := 0; i < len(validators); i++ {
-		vote := withValidator(voteProto, validators[i].GetAddress(), i)
-		_, err := signAddVote(validators[i], vote, voteSet)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	return voteSet.MakeCommit(), nil
-}

types/params.go

@@ -3,6 +3,7 @@ package types
 import (
 	"github.com/pkg/errors"
 
+	abci "github.com/tendermint/abci/types"
 	"github.com/tendermint/tmlibs/merkle"
 )
 
@@ -20,15 +21,15 @@ type ConsensusParams struct {
 
 // BlockSize contain limits on the block size.
 type BlockSize struct {
-	MaxBytes int `json:"max_bytes"` // NOTE: must not be 0 nor greater than 100MB
-	MaxTxs   int `json:"max_txs"`
-	MaxGas   int `json:"max_gas"`
+	MaxBytes int   `json:"max_bytes"` // NOTE: must not be 0 nor greater than 100MB
+	MaxTxs   int   `json:"max_txs"`
+	MaxGas   int64 `json:"max_gas"`
 }
 
 // TxSize contain limits on the tx size.
 type TxSize struct {
-	MaxBytes int `json:"max_bytes"`
-	MaxGas   int `json:"max_gas"`
+	MaxBytes int   `json:"max_bytes"`
+	MaxGas   int64 `json:"max_gas"`
 }
 
 // BlockGossip determine consensus critical elements of how blocks are gossiped
@@ -100,3 +101,42 @@ func (params *ConsensusParams) Hash() []byte {
 		"tx_size_max_gas":              params.TxSize.MaxGas,
 	})
 }
+
+// Update returns a copy of the params with updates from the non-zero fields of p2.
+// NOTE: note: must not modify the original
+func (params ConsensusParams) Update(params2 *abci.ConsensusParams) ConsensusParams {
+	res := params // explicit copy
+
+	if params2 == nil {
+		return res
+	}
+
+	// we must defensively consider any structs may be nil
+	// XXX: it's cast city over here. It's ok because we only do int32->int
+	// but still, watch it champ.
+	if params2.BlockSize != nil {
+		if params2.BlockSize.MaxBytes > 0 {
+			res.BlockSize.MaxBytes = int(params2.BlockSize.MaxBytes)
+		}
+		if params2.BlockSize.MaxTxs > 0 {
+			res.BlockSize.MaxTxs = int(params2.BlockSize.MaxTxs)
+		}
+		if params2.BlockSize.MaxGas > 0 {
+			res.BlockSize.MaxGas = params2.BlockSize.MaxGas
+		}
+	}
+	if params2.TxSize != nil {
+		if params2.TxSize.MaxBytes > 0 {
+			res.TxSize.MaxBytes = int(params2.TxSize.MaxBytes)
+		}
+		if params2.TxSize.MaxGas > 0 {
+			res.TxSize.MaxGas = params2.TxSize.MaxGas
+		}
+	}
+	if params2.BlockGossip != nil {
+		if params2.BlockGossip.BlockPartSizeBytes > 0 {
+			res.BlockGossip.BlockPartSizeBytes = int(params2.BlockGossip.BlockPartSizeBytes)
+		}
+	}
+	return res
+}

types/params_test.go

@@ -48,11 +48,11 @@ func makeParams(blockBytes, blockTx, blockGas, txBytes,
 		BlockSize: BlockSize{
 			MaxBytes: blockBytes,
 			MaxTxs:   blockTx,
-			MaxGas:   blockGas,
+			MaxGas:   int64(blockGas),
 		},
 		TxSize: TxSize{
 			MaxBytes: txBytes,
-			MaxGas:   txGas,
+			MaxGas:   int64(txGas),
 		},
 		BlockGossip: BlockGossip{
 			BlockPartSizeBytes: partSize,

types/protobuf.go

@@ -51,3 +51,21 @@ func (tm2pb) Validators(vals *ValidatorSet) []*types.Validator {
 	}
 	return validators
 }
+
+func (tm2pb) ConsensusParams(params *ConsensusParams) *types.ConsensusParams {
+	return &types.ConsensusParams{
+		BlockSize: &types.BlockSize{
+
+			MaxBytes: int32(params.BlockSize.MaxBytes),
+			MaxTxs:   int32(params.BlockSize.MaxTxs),
+			MaxGas:   params.BlockSize.MaxGas,
+		},
+		TxSize: &types.TxSize{
+			MaxBytes: int32(params.TxSize.MaxBytes),
+			MaxGas:   params.TxSize.MaxGas,
+		},
+		BlockGossip: &types.BlockGossip{
+			BlockPartSizeBytes: int32(params.BlockGossip.BlockPartSizeBytes),
+		},
+	}
+}

types/test_util.go

@@ -0,0 +1,37 @@
+package types
+
+import "time"
+
+func MakeCommit(blockID BlockID, height int64, round int,
+	voteSet *VoteSet,
+	validators []*PrivValidatorFS) (*Commit, error) {
+
+	// all sign
+	for i := 0; i < len(validators); i++ {
+
+		vote := &Vote{
+			ValidatorAddress: validators[i].GetAddress(),
+			ValidatorIndex:   i,
+			Height:           height,
+			Round:            round,
+			Type:             VoteTypePrecommit,
+			BlockID:          blockID,
+			Timestamp:        time.Now().UTC(),
+		}
+
+		_, err := signAddVote(validators[i], vote, voteSet)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return voteSet.MakeCommit(), nil
+}
+
+func signAddVote(privVal *PrivValidatorFS, vote *Vote, voteSet *VoteSet) (signed bool, err error) {
+	vote.Signature, err = privVal.Signer.Sign(SignBytes(voteSet.ChainID(), vote))
+	if err != nil {
+		return false, err
+	}
+	return voteSet.AddVote(vote)
+}

types/vote_set_test.go

@@ -59,16 +59,6 @@ func withBlockPartsHeader(vote *Vote, blockPartsHeader PartSetHeader) *Vote {
 	return vote
 }
 
-func signAddVote(privVal *PrivValidatorFS, vote *Vote, voteSet *VoteSet) (bool, error) {
-	var err error
-	vote.Signature, err = privVal.Signer.Sign(SignBytes(voteSet.ChainID(), vote))
-	if err != nil {
-		return false, err
-	}
-	added, err := voteSet.AddVote(vote)
-	return added, err
-}
-
 func TestAddVote(t *testing.T) {
 	height, round := int64(1), 0
 	voteSet, _, privValidators := randVoteSet(height, round, VoteTypePrevote, 10, 1)