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wormchain: tokenbridge: Burn wrapped coins 

Previously we would just collect all the coins in the module account,
which isn't necessary for wrapped coins that we minted.  Burn them
instead.
This commit is contained in:
Chirantan Ekbote 2022-08-23 15:54:47 +09:00 committed by Chirantan Ekbote
parent 3e6b92a1f6
commit d272eee7bc
1 changed files with 13 additions and 6 deletions
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19
wormhole_chain/x/tokenbridge/keeper/msg_server_transfer.go
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@ -9,6 +9,7 @@ import (
"github.com/certusone/wormhole-chain/x/tokenbridge/types"
whtypes "github.com/certusone/wormhole-chain/x/wormhole/types"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
"github.com/holiman/uint256"
)
@ -30,11 +31,18 @@ func (k msgServer) Transfer(goCtx context.Context, msg *types.MsgTransfer) (*typ
return nil, types.ErrNoDenomMetadata
}
// Collect coins in module account
// TODO: why not burn?
err = k.bankKeeper.SendCoins(ctx, userAcc, k.accountKeeper.GetModuleAddress(types.ModuleName), sdk.Coins{msg.Amount})
if err != nil {
return nil, err
moduleAddress := k.accountKeeper.GetModuleAddress(types.ModuleName)
_, _, wrapped := types.GetWrappedCoinMeta(msg.Amount.Denom)
if wrapped {
// We previously minted these coins so just burn them now.
if err := k.bankKeeper.BurnCoins(ctx, types.ModuleName, sdk.Coins{msg.Amount}); err != nil {
return nil, sdkerrors.Wrap(err, "failed to burn wrapped coins")
}
} else {
// Collect coins in the module account.
if err := k.bankKeeper.SendCoins(ctx, userAcc, moduleAddress, sdk.Coins{msg.Amount}); err != nil {
return nil, sdkerrors.Wrap(err, "failed to send coins to module account")
}
}
// Parse fees
@ -107,7 +115,6 @@ func (k msgServer) Transfer(goCtx context.Context, msg *types.MsgTransfer) (*typ
}
// Post message
moduleAddress := k.accountKeeper.GetModuleAddress(types.ModuleName)
emitterAddress := whtypes.EmitterAddressFromAccAddress(moduleAddress)
err = k.wormholeKeeper.PostMessage(ctx, emitterAddress, 0, buf.Bytes())
if err != nil {