feat: Remove consumer genesis migration on provider (backport #997) (#1012)

feat: Remove consumer genesis migration on provider (#997)

* Update keys.go

* tests

* fix another bug

* remove consumer genesis deletion, link to test

* remove unused bond denom method

* Revert "remove unused bond denom method"

This reverts commit f930eca.

* remove test too

* update changelog

(cherry picked from commit e2ac974)

Co-authored-by: Shawn <44221603+smarshall-spitzbart@users.noreply.github.com>

Author: mergify[bot]

CHANGELOG.md

@@ -19,11 +19,11 @@ Upgrading a consumer from `v1.2.0-multiden` to `v2.0.0` will NOT require state m
 
 ## Notable PRs included in v2.0.0
 
-* (feat) v1->v2 migrations to accommodate a bugfix having to do with store keys, introduce new params, and deal with consumer genesis state schema changes [#975](https://github.com/cosmos/interchain-security/pull/975)
+* (fix) cosumer key prefix order to avoid complex migrations [#963](https://github.com/cosmos/interchain-security/pull/963) and [#991](https://github.com/cosmos/interchain-security/pull/991). The latter PR is the proper fix.
+* (feat) v1->v2 migrations to accommodate a bugfix having to do with store keys, introduce new params, and deal with consumer genesis state schema changes [#975](https://github.com/cosmos/interchain-security/pull/975) and [#997](https://github.com/cosmos/interchain-security/pull/997)
 * (deps) Bump github.com/cosmos/ibc-go/v4 from 4.4.0 to 4.4.2 [#982](https://github.com/cosmos/interchain-security/pull/982)
 * (fix) partially revert key assignment type safety PR [#980](https://github.com/cosmos/interchain-security/pull/980)
 * (fix) Remove panics on failure to send IBC packets [#876](https://github.com/cosmos/interchain-security/pull/876)
-* (fix) consumer key prefix order to avoid complex migrations [#963](https://github.com/cosmos/interchain-security/pull/963)
 * (fix) Prevent denom DOS [#931](https://github.com/cosmos/interchain-security/pull/931)
 * (fix) multisig for assigning consumer key, use json [#916](https://github.com/cosmos/interchain-security/pull/916)
 * (deps) Bump github.com/cosmos/ibc-go/v4 from 4.3.0 to 4.4.0 [#902](https://github.com/cosmos/interchain-security/pull/902)

x/ccv/provider/keeper/migration.go

@@ -33,8 +33,10 @@ func (m Migrator) Migratev1Tov2(ctx sdk.Context) error {
 		sdk.NewCoin(m.ccvProviderKeeper.BondDenom(ctx), sdk.NewInt(10000000)),
 	)
 
-	// Delete select consumer genesis states for consumers that're launched
-	MigrateConsumerGenesisStatesv1Tov2(ctx, m.ccvProviderKeeper)
+	// Consumer genesis states persisted on the provider do not need to be migrated,
+	// as protobuf serialization is able to gracefully handle unpopulated fields when deserializing.
+	// See https://github.com/smarshall-spitzbart/ics-migration-tests/commit/b589e3982c26783ed66e954051f7da1ead16de68
+	// which passes, proving the addition of preCCV will not break things.
 
 	// Migrate keys to accommodate fix from https://github.com/cosmos/interchain-security/pull/786
 	MigrateKeysv1Tov2(ctx, m.ccvProviderKeeper)
@@ -80,14 +82,6 @@ func MigrateParamsv1Tov2(ctx sdk.Context, paramsSubspace paramtypes.Subspace, co
 	paramsSubspace.SetParamSet(ctx, &newParams)
 }
 
-func MigrateConsumerGenesisStatesv1Tov2(ctx sdk.Context, providerKeeper Keeper) {
-	// We could try to migrate existing ConsumerGenesisStates, but they're not needed after consumer launch.
-	// Hence we delete them strategically.
-	providerKeeper.DeleteConsumerGenesis(ctx, "neutron-1") // See https://github.com/neutron-org/mainnet-assets#parameters
-
-	// TODO: determine if any other ConsumerGenesisStates need to be deleted, or actually migrated!
-}
-
 // Due to https://github.com/cosmos/interchain-security/pull/786,
 // validators' slash logs are stored under the key prefix for slash acks.
 // This method will extract "slash logs" from the slash acks part of the store, and put the slash logs

x/ccv/provider/keeper/migration_test.go

@@ -13,7 +13,6 @@ import (
 	types2 "github.com/cosmos/ibc-go/v4/modules/light-clients/07-tendermint/types"
 	"github.com/cosmos/interchain-security/v2/testutil/crypto"
 	testutil "github.com/cosmos/interchain-security/v2/testutil/keeper"
-	consumertypes "github.com/cosmos/interchain-security/v2/x/ccv/consumer/types"
 	providerkeeper "github.com/cosmos/interchain-security/v2/x/ccv/provider/keeper"
 	providertypes "github.com/cosmos/interchain-security/v2/x/ccv/provider/types"
 	ccvtypes "github.com/cosmos/interchain-security/v2/x/ccv/types"
@@ -124,24 +123,6 @@ type v1Params struct {
 	MaxThrottledPackets         int64               `protobuf:"varint,8,opt,name=max_throttled_packets,json=maxThrottledPackets,proto3" json:"max_throttled_packets,omitempty"`
 }
 
-func TestMigrateConsumerGenesisv1Tov2(t *testing.T) {
-	providerKeeper, ctx, ctrl, _ := testutil.GetProviderKeeperAndCtx(t, testutil.NewInMemKeeperParams(t))
-	defer ctrl.Finish()
-
-	_, found := providerKeeper.GetConsumerGenesis(ctx, "neutron-1")
-	require.False(t, found)
-
-	providerKeeper.SetConsumerGenesis(ctx, "neutron-1", consumertypes.GenesisState{})
-
-	_, found = providerKeeper.GetConsumerGenesis(ctx, "neutron-1")
-	require.True(t, found)
-
-	providerkeeper.MigrateConsumerGenesisStatesv1Tov2(ctx, providerKeeper)
-
-	_, found = providerKeeper.GetConsumerGenesis(ctx, "neutron-1")
-	require.False(t, found)
-}
-
 func TestMigrateKeysv1Tov2(t *testing.T) {
 	providerKeeper, ctx, ctrl, _ := testutil.GetProviderKeeperAndCtx(t, testutil.NewInMemKeeperParams(t))
 	defer ctrl.Finish()