fix: add missing migration; use correct constant types

x/ccv/provider/migrations/migrator.go

@@ -29,5 +29,6 @@ func (m Migrator) Migrate1to2(ctx sdktypes.Context) error {
 
 // Migrate2to3 migrates x/ccvprovider state from consensus version 2 to 3.
 func (m Migrator) Migrate2to3(ctx sdktypes.Context) error {
+	v3.MigrateParams(ctx, m.paramSpace)
 	return v3.MigrateQueuedPackets(ctx, m.providerKeeper)
 }

x/ccv/provider/migrations/v3/migration_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	testutil "github.com/cosmos/interchain-security/v4/testutil/keeper"
+	providertypes "github.com/cosmos/interchain-security/v4/x/ccv/provider/types"
 )
 
 func TestMigrate2To3(t *testing.T) {
@@ -115,3 +116,20 @@ func TestMigrate2To3(t *testing.T) {
 		require.False(t, found)
 	}
 }
+
+func TestMigrateParams(t *testing.T) {
+	inMemParams := testutil.NewInMemKeeperParams(t)
+	_, ctx, ctrl, _ := testutil.GetProviderKeeperAndCtx(t, inMemParams)
+	defer ctrl.Finish()
+
+	// initially blocks per epoch param does not exist
+	require.False(t, inMemParams.ParamsSubspace.Has(ctx, providertypes.KeyBlocksPerEpoch))
+
+	MigrateParams(ctx, *inMemParams.ParamsSubspace)
+
+	// after migration, blocks per epoch param should exist and be equal to default
+	require.True(t, inMemParams.ParamsSubspace.Has(ctx, providertypes.KeyBlocksPerEpoch))
+	var blocksPerEpochParam int64
+	inMemParams.ParamsSubspace.Get(ctx, providertypes.KeyBlocksPerEpoch, &blocksPerEpochParam)
+	require.Equal(t, providertypes.DefaultBlocksPerEpoch, blocksPerEpochParam)
+}

x/ccv/provider/migrations/v3/migrations.go

@@ -5,7 +5,9 @@ import (
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 
+	paramtypes "github.com/cosmos/cosmos-sdk/x/params/types"
 	providerkeeper "github.com/cosmos/interchain-security/v4/x/ccv/provider/keeper"
+	providertypes "github.com/cosmos/interchain-security/v4/x/ccv/provider/types"
 )
 
 // MigrateQueuedPackets processes all queued packet data for all consumer chains that were stored
@@ -23,3 +25,12 @@ func MigrateQueuedPackets(ctx sdk.Context, k providerkeeper.Keeper) error {
 	}
 	return nil
 }
+
+func MigrateParams(ctx sdk.Context, paramsSubspace paramtypes.Subspace) {
+	if paramsSubspace.HasKeyTable() {
+		paramsSubspace.Set(ctx, providertypes.KeyBlocksPerEpoch, providertypes.DefaultBlocksPerEpoch)
+	} else {
+		paramsSubspace.WithKeyTable(providertypes.ParamKeyTable())
+		paramsSubspace.Set(ctx, providertypes.KeyBlocksPerEpoch, providertypes.DefaultBlocksPerEpoch)
+	}
+}

x/ccv/provider/types/params.go

@@ -39,7 +39,8 @@ const (
 
 	// DefaultBlocksPerEpoch defines the default blocks that constitute an epoch. Assuming we need 6 seconds per block,
 	// an epoch corresponds to 1 hour (6 * 600 = 3600 seconds).
-	DefaultBlocksPerEpoch = 600
+	// forcing int64 as the Params KeyTable expects an int64 and not int.
+	DefaultBlocksPerEpoch = int64(600)
 )
 
 // Reflection based keys for params subspace