types: add AppVersion to ConsensusParams (#5031)

Co-authored-by: JamesRay <66258875@qq.com>

making it possible to change app version via EndBlock

CHANGELOG_PENDING.md

@@ -25,7 +25,7 @@ Friendly reminder, we have a [bug bounty program](https://hackerone.com/tendermi
   - [crypto] \#4940 All keys have become `[]byte` instead of `[<size>]byte`. The byte method no longer returns the marshaled value but just the `[]byte` form of the data.
   - [crypto] \4988 Removal of key type multisig
     - The key has been moved to the Cosmos-SDK (https://github.com/cosmos/cosmos-sdk/blob/master/crypto/types/multisig/multisignature.go)
-  - [crypto] \#4989 Remove `Simple` prefixes from `SimpleProof`, `SimpleValueOp` & `SimpleProofNode`. 
+  - [crypto] \#4989 Remove `Simple` prefixes from `SimpleProof`, `SimpleValueOp` & `SimpleProofNode`.
       - `merkle.Proof` has been renamed to `ProofOps`.
       - Protobuf messages `Proof` & `ProofOp` has been moved to `proto/crypto/merkle`
       - `SimpleHashFromByteSlices` has been renamed to `HashFromByteSlices`
@@ -91,6 +91,8 @@ Friendly reminder, we have a [bug bounty program](https://hackerone.com/tendermi
 - [p2p] \#4981 Expose `SaveAs` func on NodeKey (@melekes)
 - [evidence] [#4821](https://github.com/tendermint/tendermint/pull/4821) Amnesia evidence can be detected, verified and committed (@cmwaters)
 - [rpc] \#5017 Add `/check_tx` endpoint to check transactions without executing them or adding them to the mempool (@melekes)
+- [abci] \#5031 Add `AppVersion` to consensus parameters (@james-ray)
+  ... making it possible to update your ABCI application version via `EndBlock` response
 
 ### IMPROVEMENTS:
 

abci/types/types.pb.go

@@ -2420,6 +2420,7 @@ type ConsensusParams struct {
 	Block     *BlockParams            `protobuf:"bytes,1,opt,name=block,proto3" json:"block,omitempty"`
 	Evidence  *types1.EvidenceParams  `protobuf:"bytes,2,opt,name=evidence,proto3" json:"evidence,omitempty"`
 	Validator *types1.ValidatorParams `protobuf:"bytes,3,opt,name=validator,proto3" json:"validator,omitempty"`
+	Version   *types1.VersionParams   `protobuf:"bytes,4,opt,name=version,proto3" json:"version,omitempty"`
 }
 
 func (m *ConsensusParams) Reset()         { *m = ConsensusParams{} }
@@ -2476,6 +2477,13 @@ func (m *ConsensusParams) GetValidator() *types1.ValidatorParams {
 	return nil
 }
 
+func (m *ConsensusParams) GetVersion() *types1.VersionParams {
+	if m != nil {
+		return m.Version
+	}
+	return nil
+}
+
 // BlockParams contains limits on the block size.
 type BlockParams struct {
 	// Note: must be greater than 0
@@ -3132,173 +3140,174 @@ func init() {
 func init() { proto.RegisterFile("tendermint/abci/types/types.proto", fileDescriptor_59fda1d591595b39) }
 
 var fileDescriptor_59fda1d591595b39 = []byte{
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+	0x2b, 0x9e, 0x21, 0x2c, 0xf2, 0x1e, 0x5e, 0x5b, 0xa8, 0xc4, 0x89, 0xce, 0x61, 0x6d, 0x1c, 0xd4,
+	0x2f, 0xfa, 0x48, 0x5e, 0x5b, 0xb8, 0xf4, 0x89, 0x86, 0x80, 0x26, 0x24, 0x06, 0x0b, 0xbf, 0x9c,
+	0xd7, 0x16, 0xaf, 0x87, 0x36, 0xf6, 0xbe, 0x7e, 0xbe, 0xa1, 0x7c, 0xf3, 0x7c, 0x43, 0xf9, 0xfb,
+	0xf3, 0x0d, 0xe5, 0xd9, 0x8b, 0x8d, 0xd4, 0x37, 0x2f, 0x36, 0x52, 0x7f, 0x7d, 0xb1, 0x91, 0xfa,
+	0xe9, 0x7b, 0x6d, 0x8b, 0x76, 0x06, 0xad, 0xba, 0xe1, 0xf4, 0xb6, 0xa2, 0x7f, 0x1b, 0x9a, 0xf4,
+	0x1f, 0xa7, 0x56, 0x8e, 0x07, 0xbf, 0x8f, 0xfe, 0x13, 0x00, 0x00, 0xff, 0xff, 0x61, 0x0b, 0xa4,
+	0x73, 0x03, 0x25, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -5962,6 +5971,18 @@ func (m *ConsensusParams) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	if m.Version != nil {
+		{
+			size, err := m.Version.MarshalToSizedBuffer(dAtA[:i])
+			if err != nil {
+				return 0, err
+			}
+			i -= size
+			i = encodeVarintTypes(dAtA, i, uint64(size))
+		}
+		i--
+		dAtA[i] = 0x22
+	}
 	if m.Validator != nil {
 		{
 			size, err := m.Validator.MarshalToSizedBuffer(dAtA[:i])
@@ -6358,12 +6379,12 @@ func (m *Evidence) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i--
 		dAtA[i] = 0x28
 	}
-	n48, err48 := github_com_gogo_protobuf_types.StdTimeMarshalTo(m.Time, dAtA[i-github_com_gogo_protobuf_types.SizeOfStdTime(m.Time):])
-	if err48 != nil {
-		return 0, err48
+	n49, err49 := github_com_gogo_protobuf_types.StdTimeMarshalTo(m.Time, dAtA[i-github_com_gogo_protobuf_types.SizeOfStdTime(m.Time):])
+	if err49 != nil {
+		return 0, err49
 	}
-	i -= n48
-	i = encodeVarintTypes(dAtA, i, uint64(n48))
+	i -= n49
+	i = encodeVarintTypes(dAtA, i, uint64(n49))
 	i--
 	dAtA[i] = 0x22
 	if m.Height != 0 {
@@ -7459,6 +7480,10 @@ func (m *ConsensusParams) Size() (n int) {
 		l = m.Validator.Size()
 		n += 1 + l + sovTypes(uint64(l))
 	}
+	if m.Version != nil {
+		l = m.Version.Size()
+		n += 1 + l + sovTypes(uint64(l))
+	}
 	return n
 }
 
@@ -12974,6 +12999,42 @@ func (m *ConsensusParams) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 4:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Version", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowTypes
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthTypes
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthTypes
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.Version == nil {
+				m.Version = &types1.VersionParams{}
+			}
+			if err := m.Version.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipTypes(dAtA[iNdEx:])

consensus/replay.go

@@ -253,10 +253,9 @@ func (h *Handshaker) Handshake(proxyApp proxy.AppConns) error {
 		"protocol-version", res.AppVersion,
 	)
 
-	// Set AppVersion on the state.
-	if h.initialState.Version.Consensus.App != res.AppVersion {
+	// Only set the version if we're starting from zero.
+	if h.initialState.LastBlockHeight == 0 {
 		h.initialState.Version.Consensus.App = res.AppVersion
-		sm.SaveState(h.stateDB, h.initialState)
 	}
 
 	// Replay blocks up to the latest in the blockstore.
@@ -331,6 +330,7 @@ func (h *Handshaker) ReplayBlocks(
 
 			if res.ConsensusParams != nil {
 				state.ConsensusParams = types.UpdateConsensusParams(state.ConsensusParams, res.ConsensusParams)
+				state.Version.Consensus.App = state.ConsensusParams.Version.AppVersion
 			}
 			sm.SaveState(h.stateDB, state)
 		}

proto/tendermint/abci/types/types.proto

@@ -281,6 +281,7 @@ message ConsensusParams {
   BlockParams                      block     = 1;
   tendermint.types.EvidenceParams  evidence  = 2;
   tendermint.types.ValidatorParams validator = 3;
+  tendermint.types.VersionParams   version   = 4;
 }
 
 // BlockParams contains limits on the block size.

proto/tendermint/consensus/walmsgs.pb.go

@@ -369,9 +369,7 @@ func init() {
 	proto.RegisterType((*TimedWALMessage)(nil), "tendermint.consensus.TimedWALMessage")
 }
 
-func init() {
-	proto.RegisterFile("tendermint/consensus/walmsgs.proto", fileDescriptor_ba295fe8d98f7e98)
-}
+func init() { proto.RegisterFile("tendermint/consensus/walmsgs.proto", fileDescriptor_ba295fe8d98f7e98) }
 
 var fileDescriptor_ba295fe8d98f7e98 = []byte{
 	// 542 bytes of a gzipped FileDescriptorProto

proto/tendermint/crypto/keys/types.pb.go

@@ -178,9 +178,7 @@ func init() {
 	proto.RegisterType((*PrivateKey)(nil), "tendermint.crypto.keys.PrivateKey")
 }
 
-func init() {
-	proto.RegisterFile("tendermint/crypto/keys/types.proto", fileDescriptor_6e4a90a3275dcf41)
-}
+func init() { proto.RegisterFile("tendermint/crypto/keys/types.proto", fileDescriptor_6e4a90a3275dcf41) }
 
 var fileDescriptor_6e4a90a3275dcf41 = []byte{
 	// 205 bytes of a gzipped FileDescriptorProto

proto/tendermint/types/params.pb.go

@@ -33,6 +33,7 @@ type ConsensusParams struct {
 	Block     BlockParams     `protobuf:"bytes,1,opt,name=block,proto3" json:"block"`
 	Evidence  EvidenceParams  `protobuf:"bytes,2,opt,name=evidence,proto3" json:"evidence"`
 	Validator ValidatorParams `protobuf:"bytes,3,opt,name=validator,proto3" json:"validator"`
+	Version   VersionParams   `protobuf:"bytes,4,opt,name=version,proto3" json:"version"`
 }
 
 func (m *ConsensusParams) Reset()         { *m = ConsensusParams{} }
@@ -89,6 +90,13 @@ func (m *ConsensusParams) GetValidator() ValidatorParams {
 	return ValidatorParams{}
 }
 
+func (m *ConsensusParams) GetVersion() VersionParams {
+	if m != nil {
+		return m.Version
+	}
+	return VersionParams{}
+}
+
 // BlockParams contains limits on the block size.
 type BlockParams struct {
 	// Note: must be greater than 0
@@ -285,6 +293,51 @@ func (m *ValidatorParams) GetPubKeyTypes() []string {
 	return nil
 }
 
+// VersionParams contains the ABCI application version.
+type VersionParams struct {
+	AppVersion uint64 `protobuf:"varint,1,opt,name=app_version,json=appVersion,proto3" json:"app_version,omitempty"`
+}
+
+func (m *VersionParams) Reset()         { *m = VersionParams{} }
+func (m *VersionParams) String() string { return proto.CompactTextString(m) }
+func (*VersionParams) ProtoMessage()    {}
+func (*VersionParams) Descriptor() ([]byte, []int) {
+	return fileDescriptor_e12598271a686f57, []int{4}
+}
+func (m *VersionParams) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *VersionParams) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_VersionParams.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalToSizedBuffer(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (m *VersionParams) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_VersionParams.Merge(m, src)
+}
+func (m *VersionParams) XXX_Size() int {
+	return m.Size()
+}
+func (m *VersionParams) XXX_DiscardUnknown() {
+	xxx_messageInfo_VersionParams.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_VersionParams proto.InternalMessageInfo
+
+func (m *VersionParams) GetAppVersion() uint64 {
+	if m != nil {
+		return m.AppVersion
+	}
+	return 0
+}
+
 // HashedParams is a subset of ConsensusParams.
 // It is amino encoded and hashed into
 // the Header.ConsensusHash.
@@ -297,7 +350,7 @@ func (m *HashedParams) Reset()         { *m = HashedParams{} }
 func (m *HashedParams) String() string { return proto.CompactTextString(m) }
 func (*HashedParams) ProtoMessage()    {}
 func (*HashedParams) Descriptor() ([]byte, []int) {
-	return fileDescriptor_e12598271a686f57, []int{4}
+	return fileDescriptor_e12598271a686f57, []int{5}
 }
 func (m *HashedParams) XXX_Unmarshal(b []byte) error {
 	return m.Unmarshal(b)
@@ -345,46 +398,50 @@ func init() {
 	proto.RegisterType((*BlockParams)(nil), "tendermint.types.BlockParams")
 	proto.RegisterType((*EvidenceParams)(nil), "tendermint.types.EvidenceParams")
 	proto.RegisterType((*ValidatorParams)(nil), "tendermint.types.ValidatorParams")
+	proto.RegisterType((*VersionParams)(nil), "tendermint.types.VersionParams")
 	proto.RegisterType((*HashedParams)(nil), "tendermint.types.HashedParams")
 }
 
 func init() { proto.RegisterFile("tendermint/types/params.proto", fileDescriptor_e12598271a686f57) }
 
 var fileDescriptor_e12598271a686f57 = []byte{
-	// 528 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x64, 0x53, 0x41, 0x6f, 0xd3, 0x30,
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-	0x40, 0x89, 0x04, 0x07, 0x04, 0x17, 0x44, 0x60, 0x1a, 0x08, 0x75, 0x9a, 0xa2, 0xc1, 0x61, 0x17,
-	0xcb, 0x69, 0xbc, 0x2c, 0x5a, 0x1d, 0x47, 0xb1, 0x3d, 0xb5, 0xff, 0x82, 0x23, 0xc7, 0x1d, 0xf9,
-	0x09, 0xfc, 0x84, 0x1d, 0x27, 0x71, 0x80, 0x13, 0xa0, 0xf6, 0xc2, 0xcf, 0x40, 0x79, 0x69, 0xc8,
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-	0x22, 0x49, 0xb5, 0xa7, 0xa7, 0x19, 0x57, 0x5e, 0xc6, 0x72, 0x26, 0x94, 0x9b, 0xe5, 0x52, 0x4b,
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+	// 572 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x6c, 0x53, 0xcd, 0x6e, 0xd3, 0x4c,
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+	0xf2, 0x94, 0xc5, 0x2a, 0x5a, 0x33, 0x68, 0x2b, 0xe4, 0xac, 0x04, 0x4e, 0xd5, 0xdc, 0x39, 0x84,
+	0xd6, 0x4a, 0x43, 0xc8, 0x81, 0x26, 0x2f, 0xa2, 0xf0, 0x8a, 0x8c, 0x43, 0x95, 0x7e, 0xc7, 0xe8,
+	0x9a, 0xfb, 0x5b, 0x41, 0x83, 0x17, 0xd1, 0x07, 0x32, 0x3e, 0x2b, 0x47, 0x07, 0xf5, 0xaf, 0x37,
+	0xb6, 0xf1, 0xfb, 0xc6, 0x36, 0x9c, 0x03, 0x68, 0x2e, 0xb5, 0x83, 0x6c, 0x68, 0x60, 0xce, 0x43,
+	0xdd, 0x69, 0x99, 0xc6, 0x7a, 0x00, 0x98, 0xf3, 0x19, 0x6d, 0x41, 0x7b, 0x0e, 0xdb, 0xef, 0xb0,
+	0xb8, 0x24, 0xf1, 0x4c, 0xfa, 0x04, 0x5a, 0x2a, 0xc3, 0x70, 0xb5, 0xc0, 0xa6, 0x1a, 0xf7, 0x74,
+	0x8b, 0x0e, 0x34, 0xe7, 0xbc, 0x79, 0x97, 0x0d, 0xcd, 0x3a, 0xc6, 0xc2, 0xff, 0xf8, 0x65, 0x62,
+	0x19, 0xb7, 0x13, 0xcb, 0xb8, 0x9b, 0x58, 0xc6, 0xaf, 0x89, 0x65, 0x7c, 0x9e, 0x5a, 0xb5, 0xbb,
+	0xa9, 0x55, 0xfb, 0x3e, 0xb5, 0x6a, 0xe7, 0x2f, 0x93, 0x54, 0x5e, 0x16, 0x91, 0xdb, 0x67, 0xd4,
+	0x5b, 0x7c, 0xc0, 0xf3, 0xcf, 0xea, 0x85, 0xae, 0x3e, 0xee, 0x68, 0x43, 0xcd, 0x5f, 0xfc, 0x09,
+	0x00, 0x00, 0xff, 0xff, 0xf4, 0xdd, 0x09, 0xef, 0xf7, 0x03, 0x00, 0x00,
 }
 
 func (this *ConsensusParams) Equal(that interface{}) bool {
@@ -415,6 +472,9 @@ func (this *ConsensusParams) Equal(that interface{}) bool {
 	if !this.Validator.Equal(&that1.Validator) {
 		return false
 	}
+	if !this.Version.Equal(&that1.Version) {
+		return false
+	}
 	return true
 }
 func (this *BlockParams) Equal(that interface{}) bool {
@@ -509,6 +569,30 @@ func (this *ValidatorParams) Equal(that interface{}) bool {
 	}
 	return true
 }
+func (this *VersionParams) Equal(that interface{}) bool {
+	if that == nil {
+		return this == nil
+	}
+
+	that1, ok := that.(*VersionParams)
+	if !ok {
+		that2, ok := that.(VersionParams)
+		if ok {
+			that1 = &that2
+		} else {
+			return false
+		}
+	}
+	if that1 == nil {
+		return this == nil
+	} else if this == nil {
+		return false
+	}
+	if this.AppVersion != that1.AppVersion {
+		return false
+	}
+	return true
+}
 func (this *HashedParams) Equal(that interface{}) bool {
 	if that == nil {
 		return this == nil
@@ -556,6 +640,16 @@ func (m *ConsensusParams) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
+	{
+		size, err := m.Version.MarshalToSizedBuffer(dAtA[:i])
+		if err != nil {
+			return 0, err
+		}
+		i -= size
+		i = encodeVarintParams(dAtA, i, uint64(size))
+	}
+	i--
+	dAtA[i] = 0x22
 	{
 		size, err := m.Validator.MarshalToSizedBuffer(dAtA[:i])
 		if err != nil {
@@ -657,12 +751,12 @@ func (m *EvidenceParams) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i--
 		dAtA[i] = 0x18
 	}
-	n4, err4 := github_com_gogo_protobuf_types.StdDurationMarshalTo(m.MaxAgeDuration, dAtA[i-github_com_gogo_protobuf_types.SizeOfStdDuration(m.MaxAgeDuration):])
-	if err4 != nil {
-		return 0, err4
+	n5, err5 := github_com_gogo_protobuf_types.StdDurationMarshalTo(m.MaxAgeDuration, dAtA[i-github_com_gogo_protobuf_types.SizeOfStdDuration(m.MaxAgeDuration):])
+	if err5 != nil {
+		return 0, err5
 	}
-	i -= n4
-	i = encodeVarintParams(dAtA, i, uint64(n4))
+	i -= n5
+	i = encodeVarintParams(dAtA, i, uint64(n5))
 	i--
 	dAtA[i] = 0x12
 	if m.MaxAgeNumBlocks != 0 {
@@ -705,6 +799,34 @@ func (m *ValidatorParams) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 	return len(dAtA) - i, nil
 }
 
+func (m *VersionParams) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalToSizedBuffer(dAtA[:size])
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *VersionParams) MarshalTo(dAtA []byte) (int, error) {
+	size := m.Size()
+	return m.MarshalToSizedBuffer(dAtA[:size])
+}
+
+func (m *VersionParams) MarshalToSizedBuffer(dAtA []byte) (int, error) {
+	i := len(dAtA)
+	_ = i
+	var l int
+	_ = l
+	if m.AppVersion != 0 {
+		i = encodeVarintParams(dAtA, i, uint64(m.AppVersion))
+		i--
+		dAtA[i] = 0x8
+	}
+	return len(dAtA) - i, nil
+}
+
 func (m *HashedParams) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
@@ -761,6 +883,14 @@ func NewPopulatedValidatorParams(r randyParams, easy bool) *ValidatorParams {
 	return this
 }
 
+func NewPopulatedVersionParams(r randyParams, easy bool) *VersionParams {
+	this := &VersionParams{}
+	this.AppVersion = uint64(uint64(r.Uint32()))
+	if !easy && r.Intn(10) != 0 {
+	}
+	return this
+}
+
 type randyParams interface {
 	Float32() float32
 	Float64() float64
@@ -845,6 +975,8 @@ func (m *ConsensusParams) Size() (n int) {
 	n += 1 + l + sovParams(uint64(l))
 	l = m.Validator.Size()
 	n += 1 + l + sovParams(uint64(l))
+	l = m.Version.Size()
+	n += 1 + l + sovParams(uint64(l))
 	return n
 }
 
@@ -901,6 +1033,18 @@ func (m *ValidatorParams) Size() (n int) {
 	return n
 }
 
+func (m *VersionParams) Size() (n int) {
+	if m == nil {
+		return 0
+	}
+	var l int
+	_ = l
+	if m.AppVersion != 0 {
+		n += 1 + sovParams(uint64(m.AppVersion))
+	}
+	return n
+}
+
 func (m *HashedParams) Size() (n int) {
 	if m == nil {
 		return 0
@@ -1050,6 +1194,39 @@ func (m *ConsensusParams) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 4:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Version", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowParams
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthParams
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthParams
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if err := m.Version.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipParams(dAtA[iNdEx:])
@@ -1412,6 +1589,78 @@ func (m *ValidatorParams) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *VersionParams) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowParams
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= uint64(b&0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: VersionParams: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: VersionParams: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field AppVersion", wireType)
+			}
+			m.AppVersion = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowParams
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.AppVersion |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		default:
+			iNdEx = preIndex
+			skippy, err := skipParams(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthParams
+			}
+			if (iNdEx + skippy) < 0 {
+				return ErrInvalidLengthParams
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func (m *HashedParams) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0

proto/tendermint/types/params.proto

@@ -14,6 +14,7 @@ message ConsensusParams {
   BlockParams     block     = 1 [(gogoproto.nullable) = false];
   EvidenceParams  evidence  = 2 [(gogoproto.nullable) = false];
   ValidatorParams validator = 3 [(gogoproto.nullable) = false];
+  VersionParams   version   = 4 [(gogoproto.nullable) = false];
 }
 
 // BlockParams contains limits on the block size.
@@ -64,6 +65,14 @@ message ValidatorParams {
   repeated string pub_key_types = 1;
 }
 
+// VersionParams contains the ABCI application version.
+message VersionParams {
+  option (gogoproto.populate) = true;
+  option (gogoproto.equal)    = true;
+
+  uint64 app_version = 1;
+}
+
 // HashedParams is a subset of ConsensusParams.
 // It is amino encoded and hashed into
 // the Header.ConsensusHash.

state/execution.go

@@ -431,11 +431,13 @@ func updateState(
 		if err != nil {
 			return state, fmt.Errorf("error updating consensus params: %v", err)
 		}
+
+		state.Version.Consensus.App = nextParams.Version.AppVersion
+
 		// Change results from this height but only applies to the next height.
 		lastHeightParamsChanged = header.Height + 1
 	}
 
-	// TODO: allow app to upgrade version
 	nextVersion := state.Version
 
 	// NOTE: the AppHash has not been populated.

state/execution_test.go

@@ -8,7 +8,6 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
-	"github.com/tendermint/tendermint/abci/example/kvstore"
 	abci "github.com/tendermint/tendermint/abci/types"
 	"github.com/tendermint/tendermint/crypto/ed25519"
 	cryptoenc "github.com/tendermint/tendermint/crypto/encoding"
@@ -28,8 +27,7 @@ var (
 )
 
 func TestApplyBlock(t *testing.T) {
-	app := kvstore.NewApplication()
-	app.RetainBlocks = 1
+	app := &testApp{}
 	cc := proxy.NewLocalClientCreator(app)
 	proxyApp := proxy.NewAppConns(cc)
 	err := proxyApp.Start()
@@ -44,11 +42,12 @@ func TestApplyBlock(t *testing.T) {
 	block := makeBlock(state, 1)
 	blockID := types.BlockID{Hash: block.Hash(), PartSetHeader: block.MakePartSet(testPartSize).Header()}
 
-	_, retainHeight, err := blockExec.ApplyBlock(state, blockID, block)
+	state, retainHeight, err := blockExec.ApplyBlock(state, blockID, block)
 	require.Nil(t, err)
 	assert.EqualValues(t, retainHeight, 1)
 
 	// TODO check state and mempool
+	assert.EqualValues(t, 1, state.Version.Consensus.App, "App version wasn't updated")
 }
 
 // TestBeginBlockValidators ensures we send absent validators list.
@@ -402,5 +401,4 @@ func TestEndBlockValidatorUpdatesResultingInEmptySet(t *testing.T) {
 	assert.NotPanics(t, func() { state, _, err = blockExec.ApplyBlock(state, blockID, block) })
 	assert.NotNil(t, err)
 	assert.NotEmpty(t, state.NextValidators.Validators)
-
 }

state/helpers_test.go

@@ -145,26 +145,6 @@ func genValSet(size int) *types.ValidatorSet {
 	return types.NewValidatorSet(vals)
 }
 
-func makeConsensusParams(
-	blockBytes, blockGas int64,
-	blockTimeIotaMs int64,
-	evidenceAge int64,
-	maxNumEvidence uint32,
-) tmproto.ConsensusParams {
-	return tmproto.ConsensusParams{
-		Block: tmproto.BlockParams{
-			MaxBytes:   blockBytes,
-			MaxGas:     blockGas,
-			TimeIotaMs: blockTimeIotaMs,
-		},
-		Evidence: tmproto.EvidenceParams{
-			MaxAgeNumBlocks: evidenceAge,
-			MaxAgeDuration:  time.Duration(evidenceAge),
-			MaxNum:          maxNumEvidence,
-		},
-	}
-}
-
 func makeHeaderPartsResponsesValPubKeyChange(
 	state sm.State,
 	pubkey crypto.PubKey,
@@ -266,7 +246,11 @@ func (app *testApp) BeginBlock(req abci.RequestBeginBlock) abci.ResponseBeginBlo
 }
 
 func (app *testApp) EndBlock(req abci.RequestEndBlock) abci.ResponseEndBlock {
-	return abci.ResponseEndBlock{ValidatorUpdates: app.ValidatorUpdates}
+	return abci.ResponseEndBlock{
+		ValidatorUpdates: app.ValidatorUpdates,
+		ConsensusParamUpdates: &abci.ConsensusParams{
+			Version: &tmproto.VersionParams{
+				AppVersion: 1}}}
 }
 
 func (app *testApp) DeliverTx(req abci.RequestDeliverTx) abci.ResponseDeliverTx {
@@ -278,7 +262,7 @@ func (app *testApp) CheckTx(req abci.RequestCheckTx) abci.ResponseCheckTx {
 }
 
 func (app *testApp) Commit() abci.ResponseCommit {
-	return abci.ResponseCommit{}
+	return abci.ResponseCommit{RetainHeight: 1}
 }
 
 func (app *testApp) Query(reqQuery abci.RequestQuery) (resQuery abci.ResponseQuery) {

state/state_test.go

@@ -7,7 +7,6 @@ import (
 	"math/big"
 	"os"
 	"testing"
-	"time"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -1029,41 +1028,6 @@ func TestConsensusParamsChangesSaveLoad(t *testing.T) {
 	}
 }
 
-func TestApplyUpdates(t *testing.T) {
-	initParams := makeConsensusParams(1, 2, 3, 4, 5)
-	const maxAge int64 = 66
-	cases := [...]struct {
-		init     tmproto.ConsensusParams
-		updates  abci.ConsensusParams
-		expected tmproto.ConsensusParams
-	}{
-		0: {initParams, abci.ConsensusParams{}, initParams},
-		1: {initParams, abci.ConsensusParams{}, initParams},
-		2: {initParams,
-			abci.ConsensusParams{
-				Block: &abci.BlockParams{
-					MaxBytes: 44,
-					MaxGas:   55,
-				},
-			},
-			makeConsensusParams(44, 55, 3, 4, 5)},
-		3: {initParams,
-			abci.ConsensusParams{
-				Evidence: &tmproto.EvidenceParams{
-					MaxAgeNumBlocks: maxAge,
-					MaxAgeDuration:  time.Duration(maxAge),
-					MaxNum:          10,
-				},
-			},
-			makeConsensusParams(1, 2, 3, maxAge, 10)},
-	}
-
-	for i, tc := range cases {
-		res := types.UpdateConsensusParams(tc.init, &(tc.updates))
-		assert.Equal(t, tc.expected, res, "case %d", i)
-	}
-}
-
 func TestStateProto(t *testing.T) {
 	tearDown, _, state := setupTestCase(t)
 	defer tearDown(t)

state/validation_test.go

@@ -46,9 +46,9 @@ func TestValidateBlockHeader(t *testing.T) {
 	// some bad values
 	wrongHash := tmhash.Sum([]byte("this hash is wrong"))
 	wrongVersion1 := state.Version.Consensus
-	wrongVersion1.Block++
+	wrongVersion1.Block += 2
 	wrongVersion2 := state.Version.Consensus
-	wrongVersion2.App++
+	wrongVersion2.App += 2
 
 	// Manipulation of any header field causes failure.
 	testCases := []struct {

types/params.go

@@ -30,6 +30,7 @@ func DefaultConsensusParams() *tmproto.ConsensusParams {
 		Block:     DefaultBlockParams(),
 		Evidence:  DefaultEvidenceParams(),
 		Validator: DefaultValidatorParams(),
+		Version:   DefaultVersionParams(),
 	}
 }
 
@@ -60,6 +61,12 @@ func DefaultValidatorParams() tmproto.ValidatorParams {
 	}
 }
 
+func DefaultVersionParams() tmproto.VersionParams {
+	return tmproto.VersionParams{
+		AppVersion: 0,
+	}
+}
+
 func IsValidPubkeyType(params tmproto.ValidatorParams, pubkeyType string) bool {
 	for i := 0; i < len(params.PubKeyTypes); i++ {
 		if params.PubKeyTypes[i] == pubkeyType {
@@ -182,5 +189,8 @@ func UpdateConsensusParams(params tmproto.ConsensusParams, params2 *abci.Consens
 		// This avoids having to initialize the slice to 0 values, and then write to it again.
 		res.Validator.PubKeyTypes = append([]string{}, params2.Validator.PubKeyTypes...)
 	}
+	if params2.Version != nil {
+		res.Version.AppVersion = params2.Version.AppVersion
+	}
 	return res
 }

types/params_test.go

@@ -138,3 +138,14 @@ func TestConsensusParamsUpdate(t *testing.T) {
 		assert.Equal(t, tc.updatedParams, UpdateConsensusParams(tc.params, tc.updates))
 	}
 }
+
+func TestConsensusParamsUpdate_AppVersion(t *testing.T) {
+	params := makeParams(1, 2, 10, 3, 0, valEd25519)
+
+	assert.EqualValues(t, 0, params.Version.AppVersion)
+
+	updated := UpdateConsensusParams(params,
+		&abci.ConsensusParams{Version: &tmproto.VersionParams{AppVersion: 1}})
+
+	assert.EqualValues(t, 1, updated.Version.AppVersion)
+}