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evm_hooks.go
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evm_hooks.go
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package keeper
import (
sdkerrors "cosmossdk.io/errors"
"github.com/armon/go-metrics"
"github.com/cosmos/cosmos-sdk/telemetry"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/ethereum/go-ethereum/core"
ethtypes "github.com/ethereum/go-ethereum/core/types"
evmtypes "github.com/evmos/ethermint/x/evm/types"
"github.com/kynnoenterprise/core/x/rewardshare/types"
)
var _ evmtypes.EvmHooks = Hooks{}
// Hooks wrapper struct for fees keeper
type Hooks struct {
k Keeper
}
// Hooks return the wrapper hooks struct for the Keeper
func (k Keeper) Hooks() Hooks {
return Hooks{k}
}
// PostTxProcessing is a wrapper for calling the EVM PostTxProcessing hook on
// the module keeper
func (h Hooks) PostTxProcessing(ctx sdk.Context, msg core.Message, receipt *ethtypes.Receipt) error {
return h.k.PostTxProcessing(ctx, msg, receipt)
}
// PostTxProcessing implements EvmHooks.PostTxProcessing. After each successful
// interaction with a registered contract, the contract deployer (or, if set,
// the withdraw address) receives a share from the transaction fees paid by the
// transaction sender.
func (k Keeper) PostTxProcessing(
ctx sdk.Context,
msg core.Message,
receipt *ethtypes.Receipt,
) error {
// check if the fees are globally enabled
params := k.GetParams(ctx)
if !params.EnableRewardshare {
return nil
}
contract := msg.To()
if contract == nil {
return nil
}
// if the contract is not registered to receive fees, do nothing
rewardshare, found := k.GetRewardshare(ctx, *contract)
if !found {
return nil
}
withdrawer := rewardshare.GetWithdrawerAddr()
if len(withdrawer) == 0 {
withdrawer = rewardshare.GetDeployerAddr()
}
txFee := sdk.NewIntFromUint64(receipt.GasUsed).Mul(sdk.NewIntFromBigInt(msg.GasPrice()))
developerFee := (params.DeveloperShares).MulInt(txFee).TruncateInt()
evmDenom := k.evmKeeper.GetParams(ctx).EvmDenom
fees := sdk.Coins{{Denom: evmDenom, Amount: developerFee}}
// distribute the fees to the contract deployer / withdraw address
err := k.bankKeeper.SendCoinsFromModuleToAccount(
ctx,
k.feeCollectorName,
withdrawer,
fees,
)
if err != nil {
return sdkerrors.Wrapf(
err,
"fee collector account failed to distribute developer fees (%s) to withdraw address %s. contract %s",
fees, withdrawer, contract,
)
}
defer func() {
if developerFee.IsInt64() {
telemetry.IncrCounterWithLabels(
[]string{types.ModuleName, "distribute", "total"},
float32(developerFee.Int64()),
[]metrics.Label{
telemetry.NewLabel("sender", msg.From().String()),
telemetry.NewLabel("withdraw_address", withdrawer.String()),
telemetry.NewLabel("contract", rewardshare.ContractAddress),
},
)
}
}()
ctx.EventManager().EmitEvents(
sdk.Events{
sdk.NewEvent(
types.EventTypeDistributeDevRewardshare,
sdk.NewAttribute(sdk.AttributeKeySender, msg.From().String()),
sdk.NewAttribute(types.AttributeKeyContract, contract.String()),
sdk.NewAttribute(types.AttributeKeyWithdrawerAddress, withdrawer.String()),
sdk.NewAttribute(sdk.AttributeKeyAmount, developerFee.String()),
),
},
)
return nil
}