feat: support multisend

Dockerfile

@@ -6,7 +6,7 @@ ARG TARGETARCH
 ARG GOARCH
 
 # See https://github.com/initia-labs/movevm/releases
-ENV LIBMOVEVM_VERSION=v0.5.0
+ENV LIBMOVEVM_VERSION=v0.5.1
 
 # Install necessary packages
 RUN set -eux; apk add --no-cache ca-certificates build-base git cmake

go.mod

@@ -40,7 +40,7 @@ require (
 	github.com/hashicorp/go-metrics v0.5.3
 	github.com/initia-labs/OPinit v0.5.5
 	// we also need to update `LIBMOVEVM_VERSION` of Dockerfile#9
-	github.com/initia-labs/movevm v0.5.0
+	github.com/initia-labs/movevm v0.5.1
 	github.com/noble-assets/forwarding/v2 v2.0.0-20240521090705-86712c4c9e43
 	github.com/pelletier/go-toml v1.9.5
 	github.com/pkg/errors v0.9.1

go.sum

@@ -732,8 +732,8 @@ github.com/initia-labs/OPinit/api v0.5.1 h1:zwyJf7HtKJCKvLJ1R9PjVfJO1L+d/jKoeFyT
 github.com/initia-labs/OPinit/api v0.5.1/go.mod h1:gHK6DEWb3/DqQD5LjKirUx9jilAh2UioXanoQdgqVfU=
 github.com/initia-labs/cometbft v0.0.0-20240923045653-ba99eb347236 h1:+HmPQ1uptOe4r5oQHuHMG5zF1F3maNoEba5uiTUMnlk=
 github.com/initia-labs/cometbft v0.0.0-20240923045653-ba99eb347236/go.mod h1:GPHp3/pehPqgX1930HmK1BpBLZPxB75v/dZg8Viwy+o=
-github.com/initia-labs/movevm v0.5.0 h1:dBSxoVyUumSE4x6/ZSOWtvbtZpw+V4W25/NH6qLU0uQ=
-github.com/initia-labs/movevm v0.5.0/go.mod h1:aUWdvFZPdULjJ2McQTE+mLnfnG3CLAz0TWJRFzFFUwg=
+github.com/initia-labs/movevm v0.5.1 h1:Nl5SizJIfRLM6clz/zV8dOFUXcnlMP2wOQsZB/mmU2w=
+github.com/initia-labs/movevm v0.5.1/go.mod h1:aUWdvFZPdULjJ2McQTE+mLnfnG3CLAz0TWJRFzFFUwg=
 github.com/jhump/protoreflect v1.15.3 h1:6SFRuqU45u9hIZPJAoZ8c28T3nK64BNdp9w6jFonzls=
 github.com/jhump/protoreflect v1.15.3/go.mod h1:4ORHmSBmlCW8fh3xHmJMGyul1zNqZK4Elxc8qKP+p1k=
 github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af/go.mod h1:Nht3zPeWKUH0NzdCt2Blrr5ys8VGpn0CEB0cQHVjt7k=

x/bank/keeper/msg_server.go

@@ -4,8 +4,6 @@
 	"context"
 
 	"github.com/hashicorp/go-metrics"
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
 
 	errorsmod "cosmossdk.io/errors"
 	"github.com/cosmos/cosmos-sdk/telemetry"
@@ -85,7 +83,52 @@
 }
 
 func (k msgServer) MultiSend(goCtx context.Context, msg *types.MsgMultiSend) (*types.MsgMultiSendResponse, error) {
-	return nil, status.Errorf(codes.Unimplemented, "not supported")
+	if len(msg.Inputs) == 0 {
+		return nil, types.ErrNoInputs
+	}
+
+	if len(msg.Inputs) != 1 {
+		return nil, types.ErrMultipleSenders
+	}
+
+	if len(msg.Outputs) == 0 {
+		return nil, types.ErrNoOutputs
+	}
+
+	in := msg.Inputs[0]
+	if err := types.ValidateInputOutputs(in, msg.Outputs); err != nil {
+		return nil, err
+	}
+
+	ctx := sdk.UnwrapSDKContext(goCtx)
+
+	// NOTE: totalIn == totalOut should already have been checked
+	if err := k.IsSendEnabledCoins(ctx, in.Coins...); err != nil {
+		return nil, err
+	}
+
+	if base, ok := k.Keeper.(BaseKeeper); ok {
+		for _, out := range msg.Outputs {
+			accAddr, err := base.ak.AddressCodec().StringToBytes(out.Address)
+			if err != nil {
+				return nil, err
+			}
+
+			if k.BlockedAddr(accAddr) {
+				return nil, errorsmod.Wrapf(sdkerrors.ErrUnauthorized, "%s is not allowed to receive funds", out.Address)
+			}
+
+		}
+	} else {
+		return nil, sdkerrors.ErrInvalidRequest.Wrapf("invalid keeper type: %T", k.Keeper)
+	}
+
+	err := k.InputOutputCoins(ctx, msg.Inputs[0], msg.Outputs)
+	if err != nil {
+		return nil, err
+	}
+
+	return &types.MsgMultiSendResponse{}, nil
 }
 
 func (k msgServer) UpdateParams(goCtx context.Context, req *types.MsgUpdateParams) (*types.MsgUpdateParamsResponse, error) {

x/bank/keeper/msg_server_test.go

@@ -170,6 +170,120 @@ func TestMsgSend(t *testing.T) {
 	}
 }
 
+func TestMsgMultiSend(t *testing.T) {
+	ctx, input := createDefaultTestInput(t)
+
+	origDenom := "sendableCoin"
+	origCoins := sdk.NewCoins(sdk.NewInt64Coin(origDenom, 100))
+	sendCoins := sdk.NewCoins(sdk.NewInt64Coin(origDenom, 50))
+	input.BankKeeper.SetSendEnabled(ctx, origDenom, true)
+
+	testCases := []struct {
+		name      string
+		input     *banktypes.MsgMultiSend
+		expErr    bool
+		expErrMsg string
+	}{
+		{
+			name:      "no inputs to send transaction",
+			input:     &banktypes.MsgMultiSend{},
+			expErr:    true,
+			expErrMsg: "no inputs to send transaction",
+		},
+		{
+			name: "no inputs to send transaction",
+			input: &banktypes.MsgMultiSend{
+				Outputs: []banktypes.Output{
+					{Address: addrs[4].String(), Coins: sendCoins},
+				},
+			},
+			expErr:    true,
+			expErrMsg: "no inputs to send transaction",
+		},
+		{
+			name: "more than one inputs to send transaction",
+			input: &banktypes.MsgMultiSend{
+				Inputs: []banktypes.Input{
+					{Address: addrs[0].String(), Coins: origCoins},
+					{Address: addrs[0].String(), Coins: origCoins},
+				},
+			},
+			expErr:    true,
+			expErrMsg: "multiple senders not allowed",
+		},
+		{
+			name: "no outputs to send transaction",
+			input: &banktypes.MsgMultiSend{
+				Inputs: []banktypes.Input{
+					{Address: addrs[0].String(), Coins: origCoins},
+				},
+			},
+			expErr:    true,
+			expErrMsg: "no outputs to send transaction",
+		},
+		{
+			name: "invalid send to blocked address",
+			input: &banktypes.MsgMultiSend{
+				Inputs: []banktypes.Input{
+					{Address: addrs[0].String(), Coins: origCoins},
+				},
+				Outputs: []banktypes.Output{
+					{Address: addrs[1].String(), Coins: sendCoins},
+					{Address: authtypes.NewModuleAddress(govtypes.ModuleName).String(), Coins: sendCoins},
+				},
+			},
+			expErr:    true,
+			expErrMsg: "is not allowed to receive funds",
+		},
+		{
+			name: "input/output amount mismatch",
+			input: &banktypes.MsgMultiSend{
+				Inputs: []banktypes.Input{
+					{Address: addrs[0].String(), Coins: origCoins},
+				},
+				Outputs: []banktypes.Output{
+					{Address: addrs[1].String(), Coins: origCoins},
+					{Address: addrs[2].String(), Coins: sendCoins},
+				},
+			},
+			expErr:    true,
+			expErrMsg: "sum inputs != sum outputs",
+		},
+		{
+			name: "valid send",
+			input: &banktypes.MsgMultiSend{
+				Inputs: []banktypes.Input{
+					{Address: addrs[0].String(), Coins: origCoins},
+				},
+				Outputs: []banktypes.Output{
+					{Address: addrs[1].String(), Coins: sendCoins},
+					{Address: addrs[2].String(), Coins: sendCoins},
+				},
+			},
+			expErr: false,
+		},
+	}
+
+	for _, tc := range testCases {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			if len(tc.input.Inputs) > 0 && !tc.input.Inputs[0].Coins.IsZero() && tc.input.Inputs[0].Address != "" {
+				fromAddr, err := input.AccountKeeper.AddressCodec().StringToBytes(tc.input.Inputs[0].Address)
+				require.NoError(t, err)
+				input.Faucet.Fund(ctx, fromAddr, tc.input.Inputs[0].Coins...)
+			}
+
+			_, err := bankkeeper.NewMsgServerImpl(input.BankKeeper).MultiSend(ctx, tc.input)
+			if tc.expErr {
+				require.Error(t, err)
+				require.Contains(t, err.Error(), tc.expErrMsg)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}
+
 func TestMsgSetSendEnabled(t *testing.T) {
 	ctx, input := createDefaultTestInput(t)
 

x/bank/keeper/send.go

@@ -5,11 +5,11 @@
 	"fmt"
 
 	"cosmossdk.io/core/store"
+	"cosmossdk.io/math"
 
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/telemetry"
 	sdk "github.com/cosmos/cosmos-sdk/types"
-	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 	cosmosbank "github.com/cosmos/cosmos-sdk/x/bank/keeper"
 	"github.com/cosmos/cosmos-sdk/x/bank/types"
 
@@ -104,11 +104,91 @@
 	return k.Params.Set(ctx, params)
 }
 
-// InputOutputCoins performs multi-send functionality. It accepts a series of
-// inputs that correspond to a series of outputs. It returns an error if the
-// inputs and outputs don't lineup or if any single transfer of tokens fails.
-func (k MoveSendKeeper) InputOutputCoins(ctx context.Context, inputs types.Input, outputs []types.Output) error {
-	return sdkerrors.ErrNotSupported
+// InputOutputCoins performs multi-send functionality. It transfers coins from a single sender
+// to multiple recipients. An error is returned upon failure.
+func (k MoveSendKeeper) InputOutputCoins(ctx context.Context, input types.Input, outputs []types.Output) error {
+	// Safety check ensuring that when sending coins the keeper must maintain the
+	// Check supply invariant and validity of Coins.
+	if err := types.ValidateInputOutputs(input, outputs); err != nil {
+		return err
+	}
+
+	fromAddr, err := k.ak.AddressCodec().StringToBytes(input.Address)
+	if err != nil {
+		return err
+	}
+
+	// event emission
+	sdkCtx := sdk.UnwrapSDKContext(ctx)
+	sdkCtx.EventManager().EmitEvent(
+		sdk.NewEvent(
+			sdk.EventTypeMessage,
+			sdk.NewAttribute(types.AttributeKeySender, input.Address),
+		),
+	)
+
+	// emit coin spent event
+	sdkCtx.EventManager().EmitEvent(
+		types.NewCoinSpentEvent(fromAddr, input.Coins),
+	)
+
+	// emit coin received events and do address caching
+	addrMap := make(map[string][]byte)
+	for _, output := range outputs {
+		addr, err := k.ak.AddressCodec().StringToBytes(output.Address)
+		if err != nil {
+			return err
+		}
+
+		// cache bytes address
+		addrMap[output.Address] = addr
+
+		// emit coin received event
+		sdkCtx.EventManager().EmitEvent(
+			types.NewCoinReceivedEvent(addr, output.Coins),
+		)
+
+		// emit transfer event (for compatibility with cosmos bank)
+		sdkCtx.EventManager().EmitEvent(
+			sdk.NewEvent(
+				types.EventTypeTransfer,
+				sdk.NewAttribute(types.AttributeKeyRecipient, output.Address),
+				sdk.NewAttribute(sdk.AttributeKeyAmount, output.Coins.String()),
+			),
+		)
+	}
+
+	for _, coin := range input.Coins {
+		if !coin.Amount.IsPositive() {
+			continue
+		}
+
+		recipients := make([]sdk.AccAddress, 0, len(outputs))
+		amounts := make([]math.Int, 0, len(outputs))
+		for _, output := range outputs {
+			// Create account if recipient does not exist.
+			outAddress := addrMap[output.Address]
+			accExists := k.ak.HasAccount(ctx, outAddress)
+			if !accExists {
+				defer telemetry.IncrCounter(1, "new", "account")
+				k.ak.SetAccount(ctx, k.ak.NewAccountWithAddress(ctx, outAddress))
+			}
+
+			amount := output.Coins.AmountOf(coin.Denom)
+			if !amount.IsPositive() {
+				continue
+			}
+
+			recipients = append(recipients, outAddress)
+			amounts = append(amounts, output.Coins.AmountOf(coin.Denom))
+		}
+
+		if err = k.mk.MultiSend(ctx, fromAddr, coin.Denom, recipients, amounts); err != nil {
+			return err
+		}
+	}
+
+	return nil
 }
 
 // SendCoins transfers amt coins from a sending account to a receiving account.

x/bank/types/expected_keeper.go

@@ -22,6 +22,7 @@ type MoveBankKeeper interface {
 	SendCoins(ctx context.Context, fromAddr sdk.AccAddress, toAddr sdk.AccAddress, amt sdk.Coins) error
 	MintCoins(ctx context.Context, addr sdk.AccAddress, amount sdk.Coins) error
 	BurnCoins(ctx context.Context, addr sdk.AccAddress, amount sdk.Coins) error
+	MultiSend(ctx context.Context, fromAddr sdk.AccAddress, denom string, toAddrs []sdk.AccAddress, amounts []math.Int) error
 
 	// supply
 	GetSupply(ctx context.Context, denom string) (math.Int, error)