mirror of
https://github.com/0glabs/0g-chain.git
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63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
package common
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import (
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"errors"
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storetypes "github.com/cosmos/cosmos-sdk/store/types"
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/ethereum/go-ethereum/accounts/abi"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/evmos/ethermint/x/evm/statedb"
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)
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type PrecompileCommon interface {
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Abi() *abi.ABI
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IsTx(string) bool
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KVGasConfig() storetypes.GasConfig
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}
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func InitializePrecompileCall(
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p PrecompileCommon,
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evm *vm.EVM,
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contract *vm.Contract,
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readonly bool,
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) (
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ctx sdk.Context,
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stateDB *statedb.StateDB,
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method *abi.Method,
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initialGas storetypes.Gas,
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args []interface{},
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err error,
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) {
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// parse input
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if len(contract.Input) < 4 {
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return sdk.Context{}, nil, nil, uint64(0), nil, vm.ErrExecutionReverted
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}
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method, err = p.Abi().MethodById(contract.Input[:4])
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if err != nil {
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return sdk.Context{}, nil, nil, uint64(0), nil, vm.ErrExecutionReverted
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}
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args, err = method.Inputs.Unpack(contract.Input[4:])
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if err != nil {
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return sdk.Context{}, nil, nil, uint64(0), nil, err
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}
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// readonly check
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if readonly && p.IsTx(method.Name) {
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return sdk.Context{}, nil, nil, uint64(0), nil, errors.New(ErrWriteOnReadOnly)
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}
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// get state db and context
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stateDB, ok := evm.StateDB.(*statedb.StateDB)
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if !ok {
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return sdk.Context{}, nil, nil, uint64(0), nil, errors.New(ErrGetStateDB)
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}
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ctx, err = stateDB.GetCachedContextForPrecompile()
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if err != nil {
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return sdk.Context{}, nil, nil, uint64(0), nil, err
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}
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// initial gas
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initialGas = ctx.GasMeter().GasConsumed()
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ctx = ctx.WithKVGasConfig(p.KVGasConfig())
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return ctx, stateDB, method, initialGas, args, nil
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}
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