0g-chain/migrate/v0_15/migrate.go

package v0_15

import (
	"time"

	"github.com/cosmos/cosmos-sdk/codec"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/cosmos/cosmos-sdk/x/auth"
	authexported "github.com/cosmos/cosmos-sdk/x/auth/exported"
	"github.com/cosmos/cosmos-sdk/x/auth/vesting"
	"github.com/cosmos/cosmos-sdk/x/genutil"
	"github.com/cosmos/cosmos-sdk/x/supply"
	cryptoAmino "github.com/tendermint/tendermint/crypto/encoding/amino"
	tmtypes "github.com/tendermint/tendermint/types"

	"github.com/kava-labs/kava/app"
	v0_15cdp "github.com/kava-labs/kava/x/cdp/types"
	v0_14committee "github.com/kava-labs/kava/x/committee/legacy/v0_14"
	v0_15committee "github.com/kava-labs/kava/x/committee/types"
	v0_14incentive "github.com/kava-labs/kava/x/incentive/legacy/v0_14"
	v0_15incentive "github.com/kava-labs/kava/x/incentive/types"
	"github.com/kava-labs/kava/x/kavadist"
	v0_15swap "github.com/kava-labs/kava/x/swap/types"
	v0_14validator_vesting "github.com/kava-labs/kava/x/validator-vesting"
)

var (
	GenesisTime = time.Date(2021, 8, 30, 15, 0, 0, 0, time.UTC) // 1630335600
	ChainID     = "kava-8"
	// TODO: update SWP reward per second amount before production
	// TODO: update SWP reward per second amount before production
	SwpDelegatorRewardsPerSecond         = sdk.NewCoin("swp", sdk.OneInt())
	SwpLiquidityProviderRewardsPerSecond = sdk.NewCoin("swp", sdk.OneInt())
)

// Migrate translates a genesis file from kava v0.14 format to kava v0.15 format
func Migrate(genDoc tmtypes.GenesisDoc) tmtypes.GenesisDoc {
	// migrate app state
	var appStateMap genutil.AppMap
	cdc := codec.New()
	cryptoAmino.RegisterAmino(cdc)
	tmtypes.RegisterEvidences(cdc)

	// Old codec does not need all old modules registered on it to correctly decode at this stage
	// as it only decodes the app state into a map of module names to json encoded bytes.
	if err := cdc.UnmarshalJSON(genDoc.AppState, &appStateMap); err != nil {
		panic(err)
	}

	MigrateAppState(appStateMap)

	v0_15Codec := app.MakeCodec()
	marshaledNewAppState, err := v0_15Codec.MarshalJSON(appStateMap)
	if err != nil {
		panic(err)
	}
	genDoc.AppState = marshaledNewAppState
	genDoc.GenesisTime = GenesisTime
	genDoc.ChainID = ChainID
	return genDoc
}

// MigrateAppState migrates application state from v0.14 format to a kava v0.15 format
// It modifies the provided genesis state in place.
func MigrateAppState(v0_14AppState genutil.AppMap) {
	v0_14Codec := makeV014Codec()
	v0_15Codec := app.MakeCodec()

	// Migrate auth app state
	if v0_14AppState[auth.ModuleName] != nil {
		var authGenState auth.GenesisState
		v0_14Codec.MustUnmarshalJSON(v0_14AppState[auth.ModuleName], &authGenState)
		delete(v0_14AppState, auth.ModuleName)
		v0_14AppState[auth.ModuleName] = v0_15Codec.MustMarshalJSON(Auth(v0_15Codec, authGenState, GenesisTime))
	}

	// Migrate incentive app state
	if v0_14AppState[v0_14incentive.ModuleName] != nil {
		var incentiveGenState v0_14incentive.GenesisState
		v0_14Codec.MustUnmarshalJSON(v0_14AppState[v0_14incentive.ModuleName], &incentiveGenState)
		delete(v0_14AppState, v0_14incentive.ModuleName)

		// unmarshal all cdps using v0_15 types as there has been no changes since v0_14
		var cdpGenState v0_15cdp.GenesisState
		v0_15Codec.MustUnmarshalJSON(v0_14AppState[v0_15cdp.ModuleName], &cdpGenState)

		v0_14AppState[v0_15incentive.ModuleName] = v0_15Codec.MustMarshalJSON(Incentive(v0_15Codec, incentiveGenState, cdpGenState.CDPs))
	}

	// Migrate commmittee app state
	if v0_14AppState[v0_14committee.ModuleName] != nil {
		// Unmarshal v14 committee genesis state and delete it
		var committeeGS v0_14committee.GenesisState
		v0_14Codec.MustUnmarshalJSON(v0_14AppState[v0_14committee.ModuleName], &committeeGS)
		delete(v0_14AppState, v0_14committee.ModuleName)
		// Marshal v15 committee genesis state
		v0_14AppState[v0_15committee.ModuleName] = v0_15Codec.MustMarshalJSON(Committee(committeeGS))
	}

	v0_14AppState[v0_15swap.ModuleName] = v0_15Codec.MustMarshalJSON(Swap())
}

func makeV014Codec() *codec.Codec {
	cdc := codec.New()
	sdk.RegisterCodec(cdc)
	cryptoAmino.RegisterAmino(cdc)
	auth.RegisterCodec(cdc)
	supply.RegisterCodec(cdc)
	vesting.RegisterCodec(cdc)
	v0_14validator_vesting.RegisterCodec(cdc)
	v0_14committee.RegisterCodec(cdc)
	v0_14incentive.RegisterCodec(cdc)
	return cdc
}

// Auth migrates the auth genesis state to a new state with pruned vesting periods
func Auth(cdc *codec.Codec, genesisState auth.GenesisState, genesisTime time.Time) auth.GenesisState {
	genesisStateWithAccountsMigrated := MigrateAccounts(genesisState, genesisTime)
	genesisStateWithSwpAirdrop := ApplySwpAirdrop(cdc, genesisStateWithAccountsMigrated)
	genesisStateWithSwpDistribution := DistributeSwpTokens(genesisStateWithSwpAirdrop)

	return genesisStateWithSwpDistribution
}

// ApplySwpAirdrop airdrops 1,000,000 SWP tokens to USDX depositors to HARD at block 1543671
func ApplySwpAirdrop(cdc *codec.Codec, genesisState auth.GenesisState) auth.GenesisState {
	accounts := make([]authexported.GenesisAccount, len(genesisState.Accounts))
	migratedGenesisState := auth.NewGenesisState(genesisState.Params, accounts)
	var swpAirdrop map[string]sdk.Coin
	cdc.MustUnmarshalJSON([]byte(swpAirdropMap), &swpAirdrop)
	for i, acc := range genesisState.Accounts {
		if swpReward, ok := swpAirdrop[acc.GetAddress().String()]; ok {
			err := acc.SetCoins(acc.GetCoins().Add(swpReward))
			if err != nil {
				panic(err)
			}
		}
		accounts[i] = authexported.GenesisAccount(acc)
	}
	return migratedGenesisState
}

// MigrateAccounts removes expired vesting periods from account state
func MigrateAccounts(genesisState auth.GenesisState, genesisTime time.Time) auth.GenesisState {
	accounts := make([]authexported.GenesisAccount, len(genesisState.Accounts))
	migratedGenesisState := auth.NewGenesisState(genesisState.Params, accounts)
	for i, acc := range genesisState.Accounts {
		migratedAcc := MigrateAccount(acc, genesisTime)

		accounts[i] = authexported.GenesisAccount(migratedAcc)
	}
	return migratedGenesisState
}

// global variables for swp distribution
var (
	SwpEcoSystemAddr           = mustAccAddressFromBech32("kava174crgzk006lj39s258gjxkh0p9tmmq8ugdcg0n")
	SwpTreasuryAddr            = mustAccAddressFromBech32("kava1w56wrusdnrv4tvn86eyam65wwhqatmsqg9fxjm")
	SwpTeamAddr                = mustAccAddressFromBech32("kava129eqnykzkc5ceyq9sv7ltxev22y8qwm94kr0ew")
	KavaDistAddr               = supply.NewModuleAddress(kavadist.KavaDistMacc)
	SwpTreasuryCoins           = sdk.NewCoin("swp", sdk.NewInt(62500000000000))
	SwpTreasuryOriginalVesting = sdk.NewCoin("swp", sdk.NewInt(46875000000000))
	KavaDistCoins              = sdk.NewCoin("swp", sdk.NewInt(137500000e6))
	EcoSystemCoins             = sdk.NewCoin("swp", sdk.NewInt(11500000000000))
	SwpTeamCoins               = sdk.NewCoin("swp", sdk.NewInt(37500000000000))
)

// DistributeSwpTokens sets the initial distribution of swp tokens according to the proposed token supply schedule in prop 59
func DistributeSwpTokens(genesisState auth.GenesisState) auth.GenesisState {

	// add SWP incentives (LP, Kava stakers) to kavadist module account
	accounts := make([]authexported.GenesisAccount, len(genesisState.Accounts))
	for i, acc := range genesisState.Accounts {
		if acc.GetAddress().Equals(KavaDistAddr) {
			err := acc.SetCoins(acc.GetCoins().Add(KavaDistCoins))
			if err != nil {
				panic(err)
			}
		}
		accounts[i] = authexported.GenesisAccount(acc)

	}

	// Add ecosystem account
	swpEcosystemBacc := auth.NewBaseAccountWithAddress(SwpEcoSystemAddr)
	// 11.5M because 1M has already been airdropped
	err := swpEcosystemBacc.SetCoins(sdk.NewCoins(EcoSystemCoins))
	if err != nil {
		panic(err)
	}

	// Add team vesting account
	swpTeamBacc := auth.NewBaseAccountWithAddress(SwpTeamAddr)
	err = swpTeamBacc.SetCoins(sdk.NewCoins(SwpTeamCoins))
	if err != nil {
		panic(err)
	}
	swpTeamBva, err := vesting.NewBaseVestingAccount(&swpTeamBacc, sdk.NewCoins(SwpTeamCoins), 1693407600)
	if err != nil {
		panic(err)
	}
	swpTeamTokenSchedule := []sdk.Coin{
		sdk.NewCoin("swp", sdk.NewInt(18750000000000)),
		sdk.NewCoin("swp", sdk.NewInt(4687500000000)),
		sdk.NewCoin("swp", sdk.NewInt(4687500000000)),
		sdk.NewCoin("swp", sdk.NewInt(4687500000000)),
		sdk.NewCoin("swp", sdk.NewInt(4687500000000)),
	}

	swpTeamVestingLengths := []int64{31536000, 7948800, 7776000, 7948800, 7862400}
	swpTeamVestingPeriods := vesting.Periods{}
	for i, vestingCoin := range swpTeamTokenSchedule {
		period := vesting.Period{Length: swpTeamVestingLengths[i], Amount: sdk.NewCoins(vestingCoin)}
		swpTeamVestingPeriods = append(swpTeamVestingPeriods, period)
	}
	swpTeamVestingAccount := vesting.NewPeriodicVestingAccountRaw(swpTeamBva, GenesisTime.Unix(), swpTeamVestingPeriods)

	// Add treasury vesting account
	swpTreasuryBacc := auth.NewBaseAccountWithAddress(SwpTreasuryAddr)

	err = swpTreasuryBacc.SetCoins(sdk.NewCoins(SwpTreasuryCoins))
	if err != nil {
		panic(err)
	}

	swpTreasuryBva, err := vesting.NewBaseVestingAccount(&swpTreasuryBacc, sdk.NewCoins(SwpTreasuryOriginalVesting), 1693407600)
	if err != nil {
		panic(err)
	}
	swpTreasuryTokenSchedule := []sdk.Coin{
		sdk.NewCoin("swp", sdk.NewInt(5859375e6)),
		sdk.NewCoin("swp", sdk.NewInt(5859375e6)),
		sdk.NewCoin("swp", sdk.NewInt(5859375e6)),
		sdk.NewCoin("swp", sdk.NewInt(5859375e6)),
		sdk.NewCoin("swp", sdk.NewInt(5859375e6)),
		sdk.NewCoin("swp", sdk.NewInt(5859375e6)),
		sdk.NewCoin("swp", sdk.NewInt(5859375e6)),
		sdk.NewCoin("swp", sdk.NewInt(5859375e6)),
	}
	swpTreasuryVestingLengths := []int64{7948800, 7776000, 7948800, 7862400, 7948800, 7776000, 7948800, 7862400}
	swpTreasuryVestingPeriods := vesting.Periods{}
	for i, vestingCoin := range swpTreasuryTokenSchedule {
		period := vesting.Period{Length: swpTreasuryVestingLengths[i], Amount: sdk.NewCoins(vestingCoin)}
		swpTreasuryVestingPeriods = append(swpTreasuryVestingPeriods, period)
	}
	swpTreasuryVestingAccount := vesting.NewPeriodicVestingAccountRaw(swpTreasuryBva, GenesisTime.Unix(), swpTreasuryVestingPeriods)

	accounts = append(accounts, &swpEcosystemBacc, swpTeamVestingAccount, swpTreasuryVestingAccount)

	return auth.NewGenesisState(genesisState.Params, accounts)
}

// Committee migrates from a v0.14 committee genesis state to a v0.15 committee genesis state
func Committee(genesisState v0_14committee.GenesisState) v0_15committee.GenesisState {

	committees := []v0_15committee.Committee{}
	votes := []v0_15committee.Vote{}
	proposals := []v0_15committee.Proposal{}

	for _, com := range genesisState.Committees {
		switch com.ID {
		case 1:
			// Initialize member committee without permissions
			stabilityCom := v0_15committee.NewMemberCommittee(com.ID, com.Description, com.Members,
				[]v0_15committee.Permission{}, com.VoteThreshold, com.ProposalDuration,
				v0_15committee.FirstPastThePost)

			// Build stability committee permissions
			var newStabilityCommitteePermissions []v0_15committee.Permission
			var newStabilitySubParamPermissions v0_15committee.SubParamChangePermission
			for _, perm := range com.Permissions {
				subPerm, ok := perm.(v0_14committee.SubParamChangePermission)
				if ok {
					// update AllowedParams
					var newAllowedParams v0_15committee.AllowedParams
					for _, ap := range subPerm.AllowedParams {
						newAP := v0_15committee.AllowedParam(ap)
						newAllowedParams = append(newAllowedParams, newAP)
					}
					newStabilitySubParamPermissions.AllowedParams = newAllowedParams

					// update AllowedCollateralParams
					var newCollateralParams v0_15committee.AllowedCollateralParams
					collateralTypes := []string{"bnb-a", "busd-a", "busd-b", "btcb-a", "xrpb-a", "ukava-a", "hard-a", "hbtc-a"}
					for _, cp := range subPerm.AllowedCollateralParams {
						newCP := v0_15committee.NewAllowedCollateralParam(
							cp.Type,
							cp.Denom,
							cp.LiquidationRatio,
							cp.DebtLimit,
							cp.StabilityFee,
							cp.AuctionSize,
							cp.LiquidationPenalty,
							cp.Prefix,
							cp.SpotMarketID,
							cp.LiquidationMarketID,
							cp.ConversionFactor,
							true,
							true,
						)
						newCollateralParams = append(newCollateralParams, newCP)
					}
					for _, cType := range collateralTypes {
						var foundCtype bool
						for _, cp := range newCollateralParams {
							if cType == cp.Type {
								foundCtype = true
							}
						}
						if !foundCtype {
							newCP := v0_15committee.NewAllowedCollateralParam(cType, false, false, true, true, true, false, false, false, false, false, true, true)
							newCollateralParams = append(newCollateralParams, newCP)
						}
					}
					newStabilitySubParamPermissions.AllowedCollateralParams = newCollateralParams

					// update AllowedDebtParam
					newDP := v0_15committee.AllowedDebtParam{
						Denom:            subPerm.AllowedDebtParam.Denom,
						ReferenceAsset:   subPerm.AllowedDebtParam.ReferenceAsset,
						ConversionFactor: subPerm.AllowedDebtParam.ConversionFactor,
						DebtFloor:        subPerm.AllowedDebtParam.DebtFloor,
					}
					newStabilitySubParamPermissions.AllowedDebtParam = newDP

					// update AllowedAssetParams
					var newAssetParams v0_15committee.AllowedAssetParams
					for _, ap := range subPerm.AllowedAssetParams {
						newAP := v0_15committee.AllowedAssetParam(ap)
						newAssetParams = append(newAssetParams, newAP)
					}
					newStabilitySubParamPermissions.AllowedAssetParams = newAssetParams

					// Update Allowed Markets
					var newMarketParams v0_15committee.AllowedMarkets
					for _, mp := range subPerm.AllowedMarkets {
						newMP := v0_15committee.AllowedMarket(mp)
						newMarketParams = append(newMarketParams, newMP)
					}
					newStabilitySubParamPermissions.AllowedMarkets = newMarketParams

					// Add hard money market committee permissions
					var newMoneyMarketParams v0_15committee.AllowedMoneyMarkets
					hardMMDenoms := []string{"bnb", "busd", "btcb", "xrpb", "usdx", "ukava", "hard"}
					for _, mmDenom := range hardMMDenoms {
						newMoneyMarketParam := v0_15committee.NewAllowedMoneyMarket(mmDenom, true, false, false, true, true, true)
						newMoneyMarketParams = append(newMoneyMarketParams, newMoneyMarketParam)
					}
					newStabilitySubParamPermissions.AllowedMoneyMarkets = newMoneyMarketParams
					newStabilityCommitteePermissions = append(newStabilityCommitteePermissions, newStabilitySubParamPermissions)
				}
			}
			newStabilityCommitteePermissions = append(newStabilityCommitteePermissions, v0_15committee.TextPermission{})

			// Set stability committee permissions
			newStabilityCom := stabilityCom.SetPermissions(newStabilityCommitteePermissions)
			committees = append(committees, newStabilityCom)
		case 2:
			safetyCom := v0_15committee.NewMemberCommittee(com.ID, com.Description, com.Members,
				[]v0_15committee.Permission{v0_15committee.SoftwareUpgradePermission{}},
				com.VoteThreshold, com.ProposalDuration, v0_15committee.FirstPastThePost)
			committees = append(committees, safetyCom)
		}
	}

	stabilityComMembers, err := loadStabilityComMembers()
	if err != nil {
		panic(err)
	}

	// ---------------------------- Initialize hard governance committee ----------------------------
	hardGovDuration := time.Duration(time.Hour * 24 * 7)
	hardGovThreshold := sdk.MustNewDecFromStr("0.5") // 50%
	hardGovQuorum := sdk.MustNewDecFromStr("0.1")    // 10%

	hardGovCom := v0_15committee.NewTokenCommittee(3, "Hard Governance Committee", stabilityComMembers,
		[]v0_15committee.Permission{}, hardGovThreshold, hardGovDuration, v0_15committee.Deadline,
		hardGovQuorum, "hard")

	// Add hard money market committee permissions
	var newHardCommitteePermissions []v0_15committee.Permission
	var newHardSubParamPermissions v0_15committee.SubParamChangePermission

	// Allowed params permissions
	hardComAllowedParams := v0_15committee.AllowedParams{
		v0_15committee.AllowedParam{Subspace: "hard", Key: "MoneyMarkets"},
		v0_15committee.AllowedParam{Subspace: "hard", Key: "MinimumBorrowUSDValue"},
		v0_15committee.AllowedParam{Subspace: "incentive", Key: "HardSupplyRewardPeriods"},
		v0_15committee.AllowedParam{Subspace: "incentive", Key: "HardBorrowRewardPeriods"},
		v0_15committee.AllowedParam{Subspace: "incentive", Key: "DelegatorRewardPeriods"},
	}
	newHardSubParamPermissions.AllowedParams = hardComAllowedParams

	// Money market permissions
	var newMoneyMarketParams v0_15committee.AllowedMoneyMarkets
	hardMMDenoms := []string{"bnb", "busd", "btcb", "xrpb", "usdx", "ukava", "hard"}
	for _, mmDenom := range hardMMDenoms {
		newMoneyMarketParam := v0_15committee.NewAllowedMoneyMarket(mmDenom, true, true, false, true, true, true)
		newMoneyMarketParams = append(newMoneyMarketParams, newMoneyMarketParam)
	}
	newHardSubParamPermissions.AllowedMoneyMarkets = newMoneyMarketParams
	newHardCommitteePermissions = append(newHardCommitteePermissions, newHardSubParamPermissions)

	// Text permissions
	newHardCommitteePermissions = append(newHardCommitteePermissions, v0_15committee.TextPermission{})

	// Set hard governance committee permissions
	permissionedHardGovCom := hardGovCom.SetPermissions(newHardCommitteePermissions)
	committees = append(committees, permissionedHardGovCom)

	// ---------------------------- Initialize swp governance committee ----------------------------
	swpGovDuration := time.Duration(time.Hour * 24 * 7)
	swpGovThreshold := sdk.MustNewDecFromStr("0.5") // 50%
	swpGovQuorum := sdk.MustNewDecFromStr("0.1")    // 10%

	swpGovCom := v0_15committee.NewTokenCommittee(4, "Swp Governance Committee", stabilityComMembers,
		[]v0_15committee.Permission{}, swpGovThreshold, swpGovDuration, v0_15committee.Deadline,
		swpGovQuorum, "swp")

	// Add swap committee permissions
	var newSwapCommitteePermissions []v0_15committee.Permission
	var newSwapSubParamPermissions v0_15committee.SubParamChangePermission

	// Allowed params permissions
	swpAllowedParams := v0_15committee.AllowedParams{
		v0_15committee.AllowedParam{Subspace: "swap", Key: "AllowedPools"},
		v0_15committee.AllowedParam{Subspace: "swap", Key: "SwapFee"},
		v0_15committee.AllowedParam{Subspace: "incentive", Key: "DelegatorRewardPeriods"},
		v0_15committee.AllowedParam{Subspace: "incentive", Key: "SwapRewardPeriods"},
	}
	newSwapSubParamPermissions.AllowedParams = swpAllowedParams
	newSwpCommitteePermissions := append(newSwapCommitteePermissions, newSwapSubParamPermissions)

	// Text permissions
	newSwpCommitteePermissions = append(newSwpCommitteePermissions, v0_15committee.TextPermission{})

	// Set swap governance committee permissions
	permissionedSwapGovCom := swpGovCom.SetPermissions(newSwpCommitteePermissions)
	committees = append(committees, permissionedSwapGovCom)

	for _, v := range genesisState.Votes {
		newVote := v0_15committee.NewVote(v.ProposalID, v.Voter, v0_15committee.Yes)
		votes = append(votes, v0_15committee.Vote(newVote))
	}

	for _, p := range genesisState.Proposals {
		newPubProp := v0_15committee.PubProposal(p.PubProposal)
		newProp := v0_15committee.NewProposal(newPubProp, p.ID, p.CommitteeID, p.Deadline)
		proposals = append(proposals, newProp)
	}
	return v0_15committee.NewGenesisState(
		genesisState.NextProposalID, committees, proposals, votes)
}

func loadStabilityComMembers() ([]sdk.AccAddress, error) {
	strAddrs := []string{
		"kava1gru35up50ql2wxhegr880qy6ynl63ujlv8gum2",
		"kava1sc3mh3pkas5e7xd269am4xm5mp6zweyzmhjagj",
		"kava1c9ye54e3pzwm3e0zpdlel6pnavrj9qqv6e8r4h",
		"kava1m7p6sjqrz6mylz776ct48wj6lpnpcd0z82209d",
		"kava1a9pmkzk570egv3sflu3uwdf3gejl7qfy9hghzl",
	}

	var addrs []sdk.AccAddress
	for _, strAddr := range strAddrs {
		addr, err := sdk.AccAddressFromBech32(strAddr)
		if err != nil {
			return addrs, err
		}
		addrs = append(addrs, addr)
	}

	return addrs, nil
}

// Swap introduces new v0.15 swap genesis state
func Swap() v0_15swap.GenesisState {
	pools := v0_15swap.AllowedPools{
		v0_15swap.NewAllowedPool("bnb", "usdx"),
		v0_15swap.NewAllowedPool("btcb", "usdx"),
		v0_15swap.NewAllowedPool("busd", "usdx"),
		v0_15swap.NewAllowedPool("hard", "usdx"),
		v0_15swap.NewAllowedPool("swp", "usdx"),
		v0_15swap.NewAllowedPool("ukava", "usdx"),
		v0_15swap.NewAllowedPool("usdx", "xrpb"),
	}
	fee := sdk.MustNewDecFromStr("0.0015")
	params := v0_15swap.NewParams(pools, fee)
	return v0_15swap.NewGenesisState(params, v0_15swap.DefaultPoolRecords, v0_15swap.DefaultShareRecords)
}

func mustAccAddressFromBech32(bech32Addr string) sdk.AccAddress {
	app.SetBech32AddressPrefixes(sdk.GetConfig())
	addr, err := sdk.AccAddressFromBech32(bech32Addr)
	if err != nil {
		panic(err)
	}
	return addr
}