/
swap.go
85 lines (70 loc) · 2.56 KB
/
swap.go
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package keeper
import (
"strings"
sdk "github.com/cosmos/cosmos-sdk/types"
clienttypes "github.com/cosmos/ibc-go/v2/modules/core/02-client/types"
channeltypes "github.com/cosmos/ibc-go/v2/modules/core/04-channel/types"
"github.com/disperze/ibc-osmo/x/intergamm/types"
)
// OnRecvSwapPacket processes packet reception
func (k Keeper) OnRecvSwapPacket(ctx sdk.Context, packet channeltypes.Packet, sender sdk.AccAddress, amount, denom string, data types.SwapExactAmountInPacketData) (packetAck types.SwapExactAmountInAck, err error) {
// validate packet data upon receiving
if err := data.ValidateBasic(); err != nil {
return packetAck, err
}
// skip error, validate in transferkeeper Rcv
tokenIn, _ := types.ParseTokenOnRcv(packet.GetDestPort(), packet.GetDestChannel(), amount, denom)
// Swap tokens
tokenOutAmount, tokenOutDenom, err := k.MultihopSwapExactAmountIn(ctx, sender, data.Routes, tokenIn, data.TokenOutMinAmount)
if err != nil {
return packetAck, err
}
// Send tokens output to source chain
tokenTransferOut := sdk.NewCoin(tokenOutDenom, tokenOutAmount)
// transferKeeper needs ICS4Wrapper
err = k.transferKeeper.SendTransfer(ctx, packet.GetDestPort(), packet.GetDestChannel(), tokenTransferOut, sender, data.Sender, clienttypes.ZeroHeight(), 0)
if err != nil {
return packetAck, err
}
denomPathOut, err := k.getOutDenomPath(ctx, tokenOutDenom)
if err != nil {
return packetAck, err
}
packetAck.Amount = tokenOutAmount.String()
packetAck.Denom = denomPathOut
return packetAck, nil
}
func (k Keeper) MultihopSwapExactAmountIn(
ctx sdk.Context,
sender sdk.AccAddress,
routes []types.SwapAmountInRoute,
tokenIn sdk.Coin,
tokenOutMinAmount sdk.Int,
) (tokenOutAmount sdk.Int, tokenOutDenom string, err error) {
for i, route := range routes {
_outMinAmount := sdk.NewInt(1)
if len(routes)-1 == i {
_outMinAmount = tokenOutMinAmount
}
tokenOutAmount, _, err = k.gammKeeper.SwapExactAmountIn(ctx, sender, route.PoolId, tokenIn, route.TokenOutDenom, _outMinAmount)
if err != nil {
return sdk.Int{}, "", err
}
tokenIn = sdk.NewCoin(route.TokenOutDenom, tokenOutAmount)
tokenOutDenom = route.TokenOutDenom
}
return
}
func (k Keeper) getOutDenomPath(ctx sdk.Context, denom string) (string, error) {
fullDenomPath := denom
var err error
// deconstruct the token denomination into the denomination trace info
// to determine if the sender is the source chain
if strings.HasPrefix(denom, "ibc/") {
fullDenomPath, err = k.transferKeeper.DenomPathFromHash(ctx, denom)
if err != nil {
return "", err
}
}
return fullDenomPath, err
}