feat: increment consensus ver and register migration (#1295)

* increment consensus ver and register migration

* Update CHANGELOG.md

* Update migration.go

* Update module.go

(cherry picked from commit 27ef1d2)

CHANGELOG.md

@@ -28,6 +28,7 @@ Note:
 
 Changes:
 
+* (feat) [#1295](https://github.com/cosmos/interchain-security/pull/1295) increment consumer consensus version and register consumer packet migration.
 * (fix!) [#1262](https://github.com/cosmos/interchain-security/pull/1262) Remove incorrect address validation on `ProviderFeePoolAddrStr` param.
 * (feature!) [#1244](https://github.com/cosmos/interchain-security/pull/1244) Update the default consumer unbonding period to 2 weeks.
 * (fix!) [#1244](https://github.com/cosmos/interchain-security/pull/1244) Validate token transfer messages before calling `Transfer()`.

x/ccv/consumer/keeper/migration.go

@@ -21,23 +21,27 @@ func NewMigrator(ccvConsumerKeeper Keeper, ccvConsumerParamSpace paramtypes.Subs
 	return Migrator{ccvConsumerKeeper: ccvConsumerKeeper, ccvConsumerParamSpace: ccvConsumerParamSpace}
 }
 
+// Migrate1to2 migrates x/ccvconsumer state from consensus version 1 to 2.
+func (m Migrator) Migrate1to2(ctx sdk.Context) error {
+	return m.ccvConsumerKeeper.MigrateConsumerPacketData(ctx)
+}
+
 // MigrateConsumerPacketData migrates consumer packet data according to
 // https://github.com/cosmos/interchain-security/pull/1037
 //
 // Note an equivalent migration is not required for providers.
-func (k Keeper) MigrateConsumerPacketData(ctx sdk.Context) {
+func (k Keeper) MigrateConsumerPacketData(ctx sdk.Context) error {
 	// deserialize packet data from old format
 	var depreciatedType ccvtypes.ConsumerPacketDataList
 	store := ctx.KVStore(k.storeKey)
 	bz := store.Get([]byte{consumertypes.PendingDataPacketsBytePrefix})
 	if bz == nil {
 		ctx.Logger().Info("no pending data packets to migrate")
-		return
+		return nil
 	}
 	err := depreciatedType.Unmarshal(bz)
 	if err != nil {
-		// An error here would indicate something is very wrong
-		panic(fmt.Errorf("failed to unmarshal pending data packets: %w", err))
+		return fmt.Errorf("failed to unmarshal pending data packets: %w", err)
 	}
 
 	// Delete old data
@@ -48,6 +52,7 @@ func (k Keeper) MigrateConsumerPacketData(ctx sdk.Context) {
 	for _, data := range depreciatedType.List {
 		k.AppendPendingPacket(ctx, data.Type, data.Data)
 	}
+	return nil
 }
 
 // TODO: the following hackyness could be removed if we're able to reference older versions of ICS.

x/ccv/consumer/module.go

@@ -107,6 +107,11 @@ func (AppModule) RegisterInvariants(ir sdk.InvariantRegistry) {
 // RegisterServices registers module services.
 func (am AppModule) RegisterServices(cfg module.Configurator) {
 	consumertypes.RegisterQueryServer(cfg.QueryServer(), am.keeper)
+
+	m := keeper.NewMigrator(am.keeper, am.paramSpace)
+	if err := cfg.RegisterMigration(consumertypes.ModuleName, 1, m.Migrate1to2); err != nil {
+		panic(fmt.Sprintf("failed to register migrator for %s: %s", consumertypes.ModuleName, err))
+	}
 }
 
 // InitGenesis performs genesis initialization for the consumer module. It returns
@@ -126,12 +131,7 @@ func (am AppModule) ExportGenesis(ctx sdk.Context, cdc codec.JSONCodec) json.Raw
 
 // ConsensusVersion implements AppModule/ConsensusVersion.
 func (AppModule) ConsensusVersion() uint64 {
-	// Note that v1.0.0 consumers should technically be on a different consensus version
-	// than v1.2.0-multiden and v2.0.0. However, Neutron was the first consumer to launch
-	// in prod, and they've started on v1.2.0-multiden (which has a ConsensusVersion of 1).
-	//
-	// v1.2.0-multiden and v2.0.0 are consensus compatible, so they need return the same ConsensusVersion of 1.
-	return 1
+	return 2
 }
 
 // BeginBlock implements the AppModule interface