Index supply by denom

CHANGELOG.md

@@ -52,6 +52,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (client/keys) [\#8500](https://github.com/cosmos/cosmos-sdk/pull/8500) `InfoImporter` interface is removed from legacy keybase.
 * [\#8629](https://github.com/cosmos/cosmos-sdk/pull/8629) Deprecated `SetFullFundraiserPath` from `Config` in favor of `SetPurpose` and `SetCoinType`.
 * (x/upgrade) [\#8673](https://github.com/cosmos/cosmos-sdk/pull/8673) Remove IBC logic from x/upgrade. Deprecates IBC fields in an Upgrade Plan. IBC upgrade logic moved to 02-client and an IBC UpgradeProposal is added. 
+* (x/bank) [\#8517](https://github.com/cosmos/cosmos-sdk/pull/8517) `SupplyI` interface and `Supply` are removed and uses `sdk.Coins` for supply tracking
 
 ### State Machine Breaking
 
@@ -61,7 +62,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (x/evidence) [\#8502](https://github.com/cosmos/cosmos-sdk/pull/8502) `HandleEquivocationEvidence` persists the evidence to state.
 * (x/gov) [\#7733](https://github.com/cosmos/cosmos-sdk/pull/7733) ADR 037 Implementation: Governance Split Votes
 * (x/bank) [\#8656](https://github.com/cosmos/cosmos-sdk/pull/8656) balance and supply are now correctly tracked via `coin_spent`, `coin_received`, `coinbase` and `burn` events.
-
+* (x/bank) [\#8517](https://github.com/cosmos/cosmos-sdk/pull/8517) Supply is now stored and tracked as `sdk.Coins`
 ### Improvements
 
 * (x/bank) [\#8614](https://github.com/cosmos/cosmos-sdk/issues/8614) Add `Name` and `Symbol` fields to denom metadata

proto/cosmos/bank/v1beta1/bank.proto

@@ -43,19 +43,6 @@ message Output {
       [(gogoproto.nullable) = false, (gogoproto.castrepeated) = "github.com/cosmos/cosmos-sdk/types.Coins"];
 }
 
-// Supply represents a struct that passively keeps track of the total supply
-// amounts in the network.
-message Supply {
-  option (gogoproto.equal)            = true;
-  option (gogoproto.goproto_getters)  = false;
-  option (gogoproto.goproto_stringer) = false;
-
-  option (cosmos_proto.implements_interface) = "*github.com/cosmos/cosmos-sdk/x/bank/exported.SupplyI";
-
-  repeated cosmos.base.v1beta1.Coin total = 1
-      [(gogoproto.nullable) = false, (gogoproto.castrepeated) = "github.com/cosmos/cosmos-sdk/types.Coins"];
-}
-
 // DenomUnit represents a struct that describes a given
 // denomination unit of the basic token.
 message DenomUnit {

x/bank/exported/exported.go

@@ -1,8 +1,6 @@
 package exported
 
 import (
-	"github.com/gogo/protobuf/proto"
-
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
@@ -12,18 +10,3 @@ type GenesisBalance interface {
 	GetAddress() sdk.AccAddress
 	GetCoins() sdk.Coins
 }
-
-// SupplyI defines an inflationary supply interface for modules that handle
-// token supply.
-type SupplyI interface {
-	proto.Message
-
-	GetTotal() sdk.Coins
-	SetTotal(total sdk.Coins)
-
-	Inflate(amount sdk.Coins)
-	Deflate(amount sdk.Coins)
-
-	String() string
-	ValidateBasic() error
-}

x/bank/keeper/genesis.go

@@ -31,7 +31,7 @@ func (k BaseKeeper) InitGenesis(ctx sdk.Context, genState *types.GenesisState) {
 		genState.Supply = totalSupply
 	}
 
-	k.setSupply(ctx, types.NewSupply(genState.Supply))
+	k.setSupply(ctx, genState.Supply)
 
 	for _, meta := range genState.DenomMetadata {
 		k.SetDenomMetaData(ctx, meta)
@@ -43,7 +43,7 @@ func (k BaseKeeper) ExportGenesis(ctx sdk.Context) *types.GenesisState {
 	return types.NewGenesisState(
 		k.GetParams(ctx),
 		k.GetAccountsBalances(ctx),
-		k.GetSupply(ctx).GetTotal(),
+		k.GetTotalSupply(ctx),
 		k.GetAllDenomMetaData(ctx),
 	)
 }

x/bank/keeper/genesis_test.go

@@ -31,21 +31,21 @@ func (suite *IntegrationTestSuite) TestExportGenesis() {
 
 	suite.Require().Len(exportGenesis.Params.SendEnabled, 0)
 	suite.Require().Equal(types.DefaultParams().DefaultSendEnabled, exportGenesis.Params.DefaultSendEnabled)
-	suite.Require().Equal(totalSupply.Total, exportGenesis.Supply)
+	suite.Require().Equal(totalSupply, exportGenesis.Supply)
 	// add mint module balance as nil
 	expectedBalances = append(expectedBalances, types.Balance{Address: "cosmos1m3h30wlvsf8llruxtpukdvsy0km2kum8g38c8q", Coins: nil})
 	suite.Require().Equal(expectedBalances, exportGenesis.Balances)
 	suite.Require().Equal(expectedMetadata, exportGenesis.DenomMetadata)
 }
 
-func (suite *IntegrationTestSuite) getTestBalancesAndSupply() ([]types.Balance, *types.Supply) {
+func (suite *IntegrationTestSuite) getTestBalancesAndSupply() ([]types.Balance, sdk.Coins) {
 	addr2, _ := sdk.AccAddressFromBech32("cosmos1f9xjhxm0plzrh9cskf4qee4pc2xwp0n0556gh0")
 	addr1, _ := sdk.AccAddressFromBech32("cosmos1fl48vsnmsdzcv85q5d2q4z5ajdha8yu34mf0eh")
 	addr1Balance := sdk.Coins{sdk.NewInt64Coin("testcoin3", 10)}
 	addr2Balance := sdk.Coins{sdk.NewInt64Coin("testcoin1", 32), sdk.NewInt64Coin("testcoin2", 34)}
 
-	totalSupply := types.NewSupply(addr1Balance)
-	totalSupply.Inflate(addr2Balance)
+	totalSupply := addr1Balance
+	totalSupply = totalSupply.Add(addr2Balance...)
 	return []types.Balance{
 		{Address: addr2.String(), Coins: addr2Balance},
 		{Address: addr1.String(), Coins: addr1Balance},

x/bank/keeper/grpc_query.go

@@ -79,7 +79,7 @@ func (k BaseKeeper) AllBalances(ctx context.Context, req *types.QueryAllBalances
 // TotalSupply implements the Query/TotalSupply gRPC method
 func (k BaseKeeper) TotalSupply(ctx context.Context, _ *types.QueryTotalSupplyRequest) (*types.QueryTotalSupplyResponse, error) {
 	sdkCtx := sdk.UnwrapSDKContext(ctx)
-	totalSupply := k.GetSupply(sdkCtx).GetTotal()
+	totalSupply := k.GetTotalSupply(sdkCtx)
 
 	return &types.QueryTotalSupplyResponse{Supply: totalSupply}, nil
 }
@@ -95,9 +95,9 @@ func (k BaseKeeper) SupplyOf(c context.Context, req *types.QuerySupplyOfRequest)
 	}
 
 	ctx := sdk.UnwrapSDKContext(c)
-	supply := k.GetSupply(ctx).GetTotal().AmountOf(req.Denom)
+	supply := k.GetSupply(ctx, req.Denom)
 
-	return &types.QuerySupplyOfResponse{Amount: sdk.NewCoin(req.Denom, supply)}, nil
+	return &types.QuerySupplyOfResponse{Amount: sdk.NewCoin(req.Denom, supply.Amount)}, nil
 }
 
 // Params implements the gRPC service handler for querying x/bank parameters.

x/bank/keeper/grpc_query_test.go

@@ -1,5 +1,3 @@
-// +build norace
-
 package keeper_test
 
 import (
@@ -90,27 +88,27 @@ func (suite *IntegrationTestSuite) TestQueryAllBalances() {
 
 func (suite *IntegrationTestSuite) TestQueryTotalSupply() {
 	app, ctx, queryClient := suite.app, suite.ctx, suite.queryClient
-	expectedTotalSupply := types.NewSupply(sdk.NewCoins(sdk.NewInt64Coin("test", 400000000)))
+	expectedTotalSupply := sdk.NewCoins(sdk.NewInt64Coin("test", 400000000))
 	suite.
 		Require().
-		NoError(app.BankKeeper.MintCoins(ctx, minttypes.ModuleName, expectedTotalSupply.Total))
+		NoError(app.BankKeeper.MintCoins(ctx, minttypes.ModuleName, expectedTotalSupply))
 
 	res, err := queryClient.TotalSupply(gocontext.Background(), &types.QueryTotalSupplyRequest{})
 	suite.Require().NoError(err)
 	suite.Require().NotNil(res)
 
-	suite.Require().Equal(expectedTotalSupply.Total, res.Supply)
+	suite.Require().Equal(expectedTotalSupply, res.Supply)
 }
 
 func (suite *IntegrationTestSuite) TestQueryTotalSupplyOf() {
 	app, ctx, queryClient := suite.app, suite.ctx, suite.queryClient
 
 	test1Supply := sdk.NewInt64Coin("test1", 4000000)
 	test2Supply := sdk.NewInt64Coin("test2", 700000000)
-	expectedTotalSupply := types.NewSupply(sdk.NewCoins(test1Supply, test2Supply))
+	expectedTotalSupply := sdk.NewCoins(test1Supply, test2Supply)
 	suite.
 		Require().
-		NoError(app.BankKeeper.MintCoins(ctx, minttypes.ModuleName, expectedTotalSupply.Total))
+		NoError(app.BankKeeper.MintCoins(ctx, minttypes.ModuleName, expectedTotalSupply))
 
 	_, err := queryClient.SupplyOf(gocontext.Background(), &types.QuerySupplyOfRequest{})
 	suite.Require().Error(err)

x/bank/keeper/invariants.go

@@ -50,19 +50,19 @@ func NonnegativeBalanceInvariant(k ViewKeeper) sdk.Invariant {
 func TotalSupply(k Keeper) sdk.Invariant {
 	return func(ctx sdk.Context) (string, bool) {
 		expectedTotal := sdk.Coins{}
-		supply := k.GetSupply(ctx)
+		supply := k.GetTotalSupply(ctx)
 
 		k.IterateAllBalances(ctx, func(_ sdk.AccAddress, balance sdk.Coin) bool {
 			expectedTotal = expectedTotal.Add(balance)
 			return false
 		})
 
-		broken := !expectedTotal.IsEqual(supply.GetTotal())
+		broken := !expectedTotal.IsEqual(supply)
 
 		return sdk.FormatInvariant(types.ModuleName, "total supply",
 			fmt.Sprintf(
 				"\tsum of accounts coins: %v\n"+
 					"\tsupply.Total:          %v\n",
-				expectedTotal, supply.GetTotal())), broken
+				expectedTotal, supply)), broken
 	}
 }

x/bank/keeper/keeper.go

@@ -7,7 +7,6 @@ import (
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
 	vestexported "github.com/cosmos/cosmos-sdk/x/auth/vesting/exported"
-	"github.com/cosmos/cosmos-sdk/x/bank/exported"
 	"github.com/cosmos/cosmos-sdk/x/bank/types"
 	paramtypes "github.com/cosmos/cosmos-sdk/x/params/types"
 )
@@ -22,7 +21,9 @@ type Keeper interface {
 	InitGenesis(sdk.Context, *types.GenesisState)
 	ExportGenesis(sdk.Context) *types.GenesisState
 
-	GetSupply(ctx sdk.Context) exported.SupplyI
+	GetSupply(ctx sdk.Context, denom string) sdk.Coin
+	GetTotalSupply(ctx sdk.Context) sdk.Coins
+	IterateTotalSupply(ctx sdk.Context, cb func(sdk.Coin) bool)
 
 	GetDenomMetaData(ctx sdk.Context, denom string) (types.Metadata, bool)
 	SetDenomMetaData(ctx sdk.Context, denomMetaData types.Metadata)
@@ -38,8 +39,6 @@ type Keeper interface {
 
 	DelegateCoins(ctx sdk.Context, delegatorAddr, moduleAccAddr sdk.AccAddress, amt sdk.Coins) error
 	UndelegateCoins(ctx sdk.Context, moduleAccAddr, delegatorAddr sdk.AccAddress, amt sdk.Coins) error
-	MarshalSupply(supplyI exported.SupplyI) ([]byte, error)
-	UnmarshalSupply(bz []byte) (exported.SupplyI, error)
 
 	types.QueryServer
 }
@@ -54,6 +53,16 @@ type BaseKeeper struct {
 	paramSpace paramtypes.Subspace
 }
 
+func (k BaseKeeper) GetTotalSupply(ctx sdk.Context) sdk.Coins {
+	balances := sdk.NewCoins()
+	k.IterateTotalSupply(ctx, func(balance sdk.Coin) bool {
+		balances = balances.Add(balance)
+		return false
+	})
+
+	return balances.Sort()
+}
+
 func NewBaseKeeper(
 	cdc codec.BinaryMarshaler, storeKey sdk.StoreKey, ak types.AccountKeeper, paramSpace paramtypes.Subspace,
 	blockedAddrs map[string]bool,
@@ -154,30 +163,52 @@ func (k BaseKeeper) UndelegateCoins(ctx sdk.Context, moduleAccAddr, delegatorAdd
 }
 
 // GetSupply retrieves the Supply from store
-func (k BaseKeeper) GetSupply(ctx sdk.Context) exported.SupplyI {
+func (k BaseKeeper) GetSupply(ctx sdk.Context, denom string) sdk.Coin {
 	store := ctx.KVStore(k.storeKey)
-	bz := store.Get(types.SupplyKey)
+	supplyStore := prefix.NewStore(store, types.SupplyKey)
+
+	bz := supplyStore.Get([]byte(denom))
 	if bz == nil {
-		panic("stored supply should not have been nil")
+		return sdk.Coin{
+			Denom:  denom,
+			Amount: sdk.NewInt(0),
+		}
 	}
 
-	supply, err := k.UnmarshalSupply(bz)
+	var coin sdk.Coin
+	err := k.cdc.UnmarshalBinaryBare(bz, &coin)
 	if err != nil {
 		panic(err)
 	}
 
-	return supply
+	return coin
 }
 
-// setSupply sets the Supply to store
-func (k BaseKeeper) setSupply(ctx sdk.Context, supply exported.SupplyI) {
+// SetSupply sets the Supply to store
+func (k BaseKeeper) setSupply(ctx sdk.Context, supply sdk.Coins) {
 	store := ctx.KVStore(k.storeKey)
-	bz, err := k.MarshalSupply(supply)
-	if err != nil {
-		panic(err)
+	supplyStore := prefix.NewStore(store, types.SupplyKey)
+
+	var newSupply []sdk.Coin
+	storeSupply := k.GetTotalSupply(ctx)
+
+	// update supply for coins which have non zero amount
+	for _, coin := range storeSupply {
+		if supply.AmountOf(coin.Denom).IsZero() {
+			zeroCoin := &sdk.Coin{
+				Denom:  coin.Denom,
+				Amount: sdk.NewInt(0),
+			}
+			bz := k.cdc.MustMarshalBinaryBare(zeroCoin)
+			supplyStore.Set([]byte(coin.Denom), bz)
+		}
 	}
+	newSupply = append(newSupply, supply...)
 
-	store.Set(types.SupplyKey, bz)
+	for i := range newSupply {
+		bz := k.cdc.MustMarshalBinaryBare(&supply[i])
+		supplyStore.Set([]byte(supply[i].Denom), bz)
+	}
 }
 
 // GetDenomMetaData retrieves the denomination metadata
@@ -339,8 +370,8 @@ func (k BaseKeeper) MintCoins(ctx sdk.Context, moduleName string, amt sdk.Coins)
 	}
 
 	// update total supply
-	supply := k.GetSupply(ctx)
-	supply.Inflate(amt)
+	supply := k.GetTotalSupply(ctx)
+	supply = supply.Add(amt...)
 
 	k.setSupply(ctx, supply)
 
@@ -373,8 +404,9 @@ func (k BaseKeeper) BurnCoins(ctx sdk.Context, moduleName string, amt sdk.Coins)
 	}
 
 	// update total supply
-	supply := k.GetSupply(ctx)
-	supply.Deflate(amt)
+	supply := k.GetTotalSupply(ctx)
+	supply = supply.Sub(amt)
+
 	k.setSupply(ctx, supply)
 
 	logger := k.Logger(ctx)
@@ -418,14 +450,19 @@ func (k BaseKeeper) trackUndelegation(ctx sdk.Context, addr sdk.AccAddress, amt
 	return nil
 }
 
-// MarshalSupply protobuf serializes a Supply interface
-func (k BaseKeeper) MarshalSupply(supplyI exported.SupplyI) ([]byte, error) {
-	return k.cdc.MarshalInterface(supplyI)
-}
+func (k BaseViewKeeper) IterateTotalSupply(ctx sdk.Context, cb func(sdk.Coin) bool) {
+	store := ctx.KVStore(k.storeKey)
+	supplyStore := prefix.NewStore(store, types.SupplyKey)
+
+	iterator := supplyStore.Iterator(nil, nil)
+	defer iterator.Close()
 
-// UnmarshalSupply returns a Supply interface from raw encoded supply
-// bytes of a Proto-based Supply type
-func (k BaseKeeper) UnmarshalSupply(bz []byte) (exported.SupplyI, error) {
-	var evi exported.SupplyI
-	return evi, k.cdc.UnmarshalInterface(bz, &evi)
+	for ; iterator.Valid(); iterator.Next() {
+		var balance sdk.Coin
+		k.cdc.MustUnmarshalBinaryBare(iterator.Value(), &balance)
+
+		if cb(balance) {
+			break
+		}
+	}
 }