x/ibc: fix ClientUpdateProposal unpacker (#8170)

* x/ibc: fix ClientUpdateProposal unpacker

* rm duplicate line

x/ibc/core/02-client/types/proposal.go

@@ -1,6 +1,7 @@
 package types
 
 import (
+	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
 	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
 	host "github.com/cosmos/cosmos-sdk/x/ibc/core/24-host"
 	"github.com/cosmos/cosmos-sdk/x/ibc/core/exported"
@@ -11,7 +12,10 @@ const (
 	ProposalTypeClientUpdate = "ClientUpdate"
 )
 
-var _ govtypes.Content = &ClientUpdateProposal{}
+var (
+	_ govtypes.Content                   = &ClientUpdateProposal{}
+	_ codectypes.UnpackInterfacesMessage = ClientUpdateProposal{}
+)
 
 // NewClientUpdateProposal creates a new client update proposal.
 func NewClientUpdateProposal(title, description, clientID string, header exported.Header) (*ClientUpdateProposal, error) {
@@ -58,3 +62,9 @@ func (cup *ClientUpdateProposal) ValidateBasic() error {
 
 	return header.ValidateBasic()
 }
+
+// UnpackInterfaces implements the UnpackInterfacesMessage interface.
+func (cup ClientUpdateProposal) UnpackInterfaces(unpacker codectypes.AnyUnpacker) error {
+	var header exported.Header
+	return unpacker.UnpackAny(cup.Header, &header)
+}

x/ibc/core/02-client/types/proposal_test.go

@@ -1,6 +1,8 @@
 package types_test
 
 import (
+	"github.com/cosmos/cosmos-sdk/codec"
+	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
 	govtypes "github.com/cosmos/cosmos-sdk/x/gov/types"
 	"github.com/cosmos/cosmos-sdk/x/ibc/core/02-client/types"
 	ibctmtypes "github.com/cosmos/cosmos-sdk/x/ibc/light-clients/07-tendermint/types"
@@ -71,3 +73,35 @@ func (suite *TypesTestSuite) TestValidateBasic() {
 		}
 	}
 }
+
+// tests a client update proposal can be marshaled and unmarshaled, and the
+// client state can be unpacked
+func (suite *TypesTestSuite) TestMarshalClientUpdateProposalProposal() {
+	_, err := types.PackHeader(&ibctmtypes.Header{})
+	suite.Require().NoError(err)
+
+	// create proposal
+	header := suite.chainA.CurrentTMClientHeader()
+	proposal, err := types.NewClientUpdateProposal("update IBC client", "description", "client-id", header)
+	suite.Require().NoError(err)
+
+	// create codec
+	ir := codectypes.NewInterfaceRegistry()
+	types.RegisterInterfaces(ir)
+	govtypes.RegisterInterfaces(ir)
+	ibctmtypes.RegisterInterfaces(ir)
+	cdc := codec.NewProtoCodec(ir)
+
+	// marshal message
+	bz, err := cdc.MarshalJSON(proposal)
+	suite.Require().NoError(err)
+
+	// unmarshal proposal
+	newProposal := &types.ClientUpdateProposal{}
+	err = cdc.UnmarshalJSON(bz, newProposal)
+	suite.Require().NoError(err)
+
+	// unpack client state
+	_, err = types.UnpackHeader(newProposal.Header)
+	suite.Require().NoError(err)
+}

x/upgrade/types/plan.go

@@ -8,7 +8,6 @@ import (
 	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
-
 	clienttypes "github.com/cosmos/cosmos-sdk/x/ibc/core/02-client/types"
 	ibcexported "github.com/cosmos/cosmos-sdk/x/ibc/core/exported"
 )