chore: CheckSubstituteAndUpdateState stores client state in lightclie…

…nts impl (#1170)

* set client state in store in lightclient

* adding changelog entry

CHANGELOG.md

@@ -45,6 +45,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Improvements
 * [\#1186](https://github.com/cosmos/ibc-go/pull/1186/files) Removing `GetRoot` function from ConsensusState interface in `02-client`. `GetRoot` is unused by core IBC. 
 * (modules/core/02-client) [\#1196](https://github.com/cosmos/ibc-go/pull/1196) Adding VerifyClientMessage to ClientState interface. 
+* (modules/core/02-client) [\#1170](https://github.com/cosmos/ibc-go/pull/1170) Updating `ClientUpdateProposal` to set client state in lightclient implementations `CheckSubstituteAndUpdateState` methods.
 
 ### Features
 

modules/core/02-client/keeper/proposal.go

@@ -53,7 +53,6 @@ func (k Keeper) ClientUpdateProposal(ctx sdk.Context, p *types.ClientUpdatePropo
 	if err != nil {
 		return err
 	}
-	k.SetClientState(ctx, p.SubjectClientId, clientState)
 
 	k.Logger(ctx).Info("client updated after governance proposal passed", "client-id", p.SubjectClientId, "height", clientState.GetLatestHeight().String())
 

modules/light-clients/06-solomachine/types/proposal_handle.go

@@ -60,5 +60,7 @@ func (cs ClientState) CheckSubstituteAndUpdateState(
 	clientState.ConsensusState = substituteClientState.ConsensusState
 	clientState.IsFrozen = false
 
+	setClientState(subjectClientStore, cdc, clientState)
+
 	return clientState, nil
 }

modules/light-clients/06-solomachine/types/proposal_handle_test.go

@@ -1,6 +1,8 @@
 package types_test
 
 import (
+	clienttypes "github.com/cosmos/ibc-go/v3/modules/core/02-client/types"
+	host "github.com/cosmos/ibc-go/v3/modules/core/24-host"
 	"github.com/cosmos/ibc-go/v3/modules/core/exported"
 	"github.com/cosmos/ibc-go/v3/modules/light-clients/06-solomachine/types"
 	ibctmtypes "github.com/cosmos/ibc-go/v3/modules/light-clients/07-tendermint/types"
@@ -78,6 +80,10 @@ func (suite *SoloMachineTestSuite) TestCheckSubstituteAndUpdateState() {
 					suite.Require().Equal(substituteClientState.(*types.ClientState).ConsensusState, updatedClient.(*types.ClientState).ConsensusState)
 					suite.Require().Equal(substituteClientState.(*types.ClientState).Sequence, updatedClient.(*types.ClientState).Sequence)
 					suite.Require().Equal(false, updatedClient.(*types.ClientState).IsFrozen)
+
+					// ensure updated client state is set in store
+					bz := subjectClientStore.Get(host.ClientStateKey())
+					suite.Require().Equal(clienttypes.MustMarshalClientState(suite.chainA.Codec, updatedClient), bz)
 				} else {
 					suite.Require().Error(err)
 					suite.Require().Nil(updatedClient)

modules/light-clients/07-tendermint/types/proposal_handle.go

@@ -87,6 +87,7 @@ func (cs ClientState) CheckSubstituteAndUpdateState(
 
 	// no validation is necessary since the substitute is verified to be Active
 	// in 02-client.
+	setClientState(subjectClientStore, cdc, &cs)
 
 	return &cs, nil
 }

modules/light-clients/07-tendermint/types/proposal_handle_test.go

@@ -4,6 +4,7 @@ import (
 	"time"
 
 	clienttypes "github.com/cosmos/ibc-go/v3/modules/core/02-client/types"
+	host "github.com/cosmos/ibc-go/v3/modules/core/24-host"
 	"github.com/cosmos/ibc-go/v3/modules/core/exported"
 	"github.com/cosmos/ibc-go/v3/modules/light-clients/07-tendermint/types"
 	ibctesting "github.com/cosmos/ibc-go/v3/testing"
@@ -299,6 +300,10 @@ func (suite *TendermintTestSuite) TestCheckSubstituteAndUpdateState() {
 				suite.Require().Equal(expectedIterationKey, subjectIterationKey)
 
 				suite.Require().Equal(newChainID, updatedClient.(*types.ClientState).ChainId)
+
+				// ensure updated client state is set in store
+				bz := subjectClientStore.Get(host.ClientStateKey())
+				suite.Require().Equal(clienttypes.MustMarshalClientState(suite.chainA.Codec, updatedClient), bz)
 			} else {
 				suite.Require().Error(err)
 				suite.Require().Nil(updatedClient)