migrate stXXX/XXX constant product pool -> stableswap pool

app/upgrades/v15/constants.go

@@ -15,6 +15,11 @@ import (
 // UpgradeName defines the on-chain upgrade name for the Osmosis v15 upgrade.
 const UpgradeName = "v15"
 
+// pool ids to migrate
+const stOSMO_OSMOPoolId = 833
+const stJUNO_JUNOPoolId = 817
+const stSTARS_STARSPoolId = 810
+
 var Upgrade = upgrades.Upgrade{
 	UpgradeName:          UpgradeName,
 	CreateUpgradeHandler: CreateUpgradeHandler,

app/upgrades/v15/export_test.go

@@ -7,6 +7,7 @@ import (
 	bankkeeper "github.com/cosmos/cosmos-sdk/x/bank/keeper"
 
 	gammkeeper "github.com/osmosis-labs/osmosis/v14/x/gamm/keeper"
+	"github.com/osmosis-labs/osmosis/v14/x/poolmanager"
 	poolmanagerkeeper "github.com/osmosis-labs/osmosis/v14/x/poolmanager"
 )
 
@@ -21,3 +22,7 @@ func RegisterOsmoIonMetadata(ctx sdk.Context, bankKeeper bankkeeper.Keeper) {
 func SetICQParams(ctx sdk.Context, icqKeeper *icqkeeper.Keeper) {
 	setICQParams(ctx, icqKeeper)
 }
+
+func MigrateBalancerPoolToSolidlyStable(ctx sdk.Context, gammKeeper *gammkeeper.Keeper, poolmanagerKeeper *poolmanager.Keeper, poolId uint64) {
+	migrateBalancerPoolToSolidlyStable(ctx, gammKeeper, poolmanagerKeeper, poolId)
+}

app/upgrades/v15/upgrade_test.go

@@ -4,18 +4,28 @@ import (
 	"reflect"
 	"testing"
 
-	gamm "github.com/osmosis-labs/osmosis/v14/x/gamm/keeper"
-
+	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/stretchr/testify/suite"
 
 	"github.com/osmosis-labs/osmosis/v14/app/apptesting"
 	v15 "github.com/osmosis-labs/osmosis/v14/app/upgrades/v15"
+	gamm "github.com/osmosis-labs/osmosis/v14/x/gamm/keeper"
+	balancer "github.com/osmosis-labs/osmosis/v14/x/gamm/pool-models/balancer"
+	balancertypes "github.com/osmosis-labs/osmosis/v14/x/gamm/pool-models/balancer"
+	poolmanagertypes "github.com/osmosis-labs/osmosis/v14/x/poolmanager/types"
 )
 
 type UpgradeTestSuite struct {
 	apptesting.KeeperTestHelper
 }
 
+var DefaultAcctFunds sdk.Coins = sdk.NewCoins(
+	sdk.NewCoin("uosmo", sdk.NewInt(10000000000)),
+	sdk.NewCoin("foo", sdk.NewInt(10000000)),
+	sdk.NewCoin("bar", sdk.NewInt(10000000)),
+	sdk.NewCoin("baz", sdk.NewInt(10000000)),
+)
+
 func (suite *UpgradeTestSuite) SetupTest() {
 	suite.Setup()
 }
@@ -67,6 +77,62 @@ func (suite *UpgradeTestSuite) TestMigrateNextPoolIdAndCreatePool() {
 	suite.Require().Equal(gammPoolCreationFee, poolmanagerPoolCreationFee)
 }
 
+
+func (suite *UpgradeTestSuite) TestMigrateBalancerToStablePools() {
+	suite.SetupTest() // reset
+
+	ctx := suite.Ctx
+	gammKeeper := suite.App.GAMMKeeper
+	poolmanagerKeeper := suite.App.PoolManagerKeeper
+	// bankKeeper := suite.App.BankKeeper
+	testAccount := suite.TestAccs[0]
+
+	// Mint some assets to the accounts.
+	suite.FundAcc(testAccount, DefaultAcctFunds)
+
+	// Create the balancer pool
+	swapFee, err := sdk.NewDecFromStr("0.003")
+	exitFee, err := sdk.NewDecFromStr("0.025")
+	poolID, err := suite.App.PoolManagerKeeper.CreatePool(
+		suite.Ctx,
+		balancer.NewMsgCreateBalancerPool(suite.TestAccs[0],
+		balancer.PoolParams{
+			SwapFee: swapFee,
+			ExitFee: exitFee,
+		},
+		[]balancertypes.PoolAsset{
+			{
+				Weight: sdk.NewInt(100),
+				Token:  sdk.NewCoin("foo", sdk.NewInt(5000000)),
+			},
+			{
+				Weight: sdk.NewInt(200),
+				Token:  sdk.NewCoin("bar", sdk.NewInt(5000000)),
+			},
+		},
+		""),
+	)
+	_ = poolID
+	suite.Require().NoError(err)
+
+	// create the pool
+	balancerPool, err := gammKeeper.GetPool(suite.Ctx, poolID)
+	suite.Require().NoError(err)
+	balancerShares := balancerPool.GetTotalShares()
+
+	// test migrating the balancer pool to a stable pool
+	v15.MigrateBalancerPoolToSolidlyStable(ctx, gammKeeper, poolmanagerKeeper, poolID)
+
+	// check that the pool is now a stable pool
+	stablepool, err := gammKeeper.GetPool(ctx, poolID)
+	suite.Require().NoError(err)
+	suite.Require().Equal(stablepool.GetType(), poolmanagertypes.Stableswap)
+
+	// check that the number of stableswap LP shares is the same as the number of balancer LP shares
+	suite.Require().Equal(balancerShares.String(), stablepool.GetTotalShares().String())
+
+}
+
 func (suite *UpgradeTestSuite) TestRegisterOsmoIonMetadata() {
 	suite.SetupTest() // reset
 

app/upgrades/v15/upgrades.go

@@ -4,11 +4,12 @@ import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/types/module"
 	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
-	"github.com/osmosis-labs/osmosis/v14/wasmbinding"
 	icqkeeper "github.com/strangelove-ventures/async-icq/v4/keeper"
 	icqtypes "github.com/strangelove-ventures/async-icq/v4/types"
 	packetforwardtypes "github.com/strangelove-ventures/packet-forward-middleware/v4/router/types"
 
+	"github.com/osmosis-labs/osmosis/v14/wasmbinding"
+
 	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
 
 	bankkeeper "github.com/cosmos/cosmos-sdk/x/bank/keeper"
@@ -17,6 +18,8 @@ import (
 	appParams "github.com/osmosis-labs/osmosis/v14/app/params"
 	"github.com/osmosis-labs/osmosis/v14/app/upgrades"
 	gammkeeper "github.com/osmosis-labs/osmosis/v14/x/gamm/keeper"
+	"github.com/osmosis-labs/osmosis/v14/x/gamm/pool-models/stableswap"
+	gammtypes "github.com/osmosis-labs/osmosis/v14/x/gamm/types"
 	"github.com/osmosis-labs/osmosis/v14/x/poolmanager"
 	poolmanagertypes "github.com/osmosis-labs/osmosis/v14/x/poolmanager/types"
 )
@@ -47,6 +50,10 @@ func CreateUpgradeHandler(
 		// They are added in this upgrade.
 		registerOsmoIonMetadata(ctx, keepers.BankKeeper)
 
+		// Stride stXXX/XXX pools are being migrated from the standard balancer curve to the
+		// solidly stable curve.
+		migrateBalancerPoolsToSolidlyStable(ctx, keepers.GAMMKeeper, keepers.PoolManagerKeeper)
+
 		return mm.RunMigrations(ctx, configurator, fromVM)
 	}
 }
@@ -59,6 +66,48 @@ func setICQParams(ctx sdk.Context, icqKeeper *icqkeeper.Keeper) {
 	icqKeeper.SetParams(ctx, icqparams)
 }
 
+func migrateBalancerPoolsToSolidlyStable(ctx sdk.Context, gammKeeper *gammkeeper.Keeper, poolmanagerKeeper *poolmanager.Keeper) {
+	// migrate stOSMO_OSMOPoolId, stJUNO_JUNOPoolId, stSTARS_STARSPoolId
+	pools := []uint64{stOSMO_OSMOPoolId, stJUNO_JUNOPoolId, stSTARS_STARSPoolId}
+	for _, poolId := range pools {
+		migrateBalancerPoolToSolidlyStable(ctx, gammKeeper, poolmanagerKeeper, poolId)
+	}
+}
+
+func migrateBalancerPoolToSolidlyStable(ctx sdk.Context, gammKeeper *gammkeeper.Keeper, poolmanagerKeeper *poolmanager.Keeper, poolId uint64) {
+	// fetch the pool with the given poolId
+	balancerPool, err := gammKeeper.GetPool(ctx, poolId)
+	if err != nil {
+		panic(err)
+	}
+
+	// initialize the stableswap pool
+	stableswapPool, err := stableswap.NewStableswapPool(
+		poolId,
+		stableswap.PoolParams{SwapFee: balancerPool.GetSwapFee(ctx), ExitFee: balancerPool.GetExitFee(ctx)},
+		balancerPool.GetTotalPoolLiquidity(ctx),
+		[]uint64{1, 1},
+		"osmo1k8c2m5cn322akk5wy8lpt87dd2f4yh9afcd7af", // Stride Foundation 2/3 multisig
+		"",
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	// ensure the number of stableswap LP shares is the same as the number of balancer LP shares
+	totalShares := sdk.NewCoin(
+		gammtypes.GetPoolShareDenom(poolId),
+		balancerPool.GetTotalShares(),
+	)
+	stableswapPool.TotalShares = totalShares
+
+	// overwrite the balancer pool with the new stableswap pool
+	err = gammKeeper.OverwritePool(ctx, &stableswapPool)
+	if err != nil {
+		panic(err)
+	}
+}
+
 func migrateNextPoolId(ctx sdk.Context, gammKeeper *gammkeeper.Keeper, poolmanagerKeeper *poolmanager.Keeper) {
 	// N.B: pool id in gamm is to be deprecated in the future
 	// Instead,it is moved to poolmanager.

x/gamm/keeper/pool.go

@@ -105,6 +105,11 @@ func (k Keeper) setPool(ctx sdk.Context, pool poolmanagertypes.PoolI) error {
 	return nil
 }
 
+// Is this the preferred way to call setPool from the upgrade handler?
+func (k Keeper) OverwritePool(ctx sdk.Context, pool poolmanagertypes.PoolI) error {
+	return k.setPool(ctx, pool)
+}
+
 func (k Keeper) DeletePool(ctx sdk.Context, poolId uint64) error {
 	store := ctx.KVStore(k.storeKey)
 	poolKey := types.GetKeyPrefixPools(poolId)