github.com/n1ghtfa1l/go-vnt@v0.6.4-alpha.6/core/vm/contracts.go (about) 1 // Copyright 2014 The go-ethereum Authors 2 // This file is part of the go-ethereum library. 3 // 4 // The go-ethereum library is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU Lesser General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // The go-ethereum library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU Lesser General Public License for more details. 13 // 14 // You should have received a copy of the GNU Lesser General Public License 15 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. 16 17 package vm 18 19 import ( 20 "math/big" 21 22 "github.com/vntchain/go-vnt/common" 23 "github.com/vntchain/go-vnt/core/vm/election" 24 inter "github.com/vntchain/go-vnt/core/vm/interface" 25 ) 26 27 // PrecompiledContract is the basic interface for native Go contracts. The implementation 28 // requires a deterministic gas count based on the input size of the Run method of the 29 // contract. 30 type PrecompiledContract interface { 31 RequiredGas(input []byte) uint64 // RequiredPrice calculates the contract gas use 32 Run(context inter.ChainContext, input []byte, value *big.Int) ([]byte, error) // Run runs the precompiled contract 33 } 34 35 // PrecompiledContractsHubble contains the default set of pre-compiled VNT 36 // contracts used in the Hubble release. 37 var PrecompiledContractsHubble = map[common.Address]PrecompiledContract{ 38 common.BytesToAddress([]byte{9}): &election.Election{}, 39 } 40 41 // RunPrecompiledContract runs and evaluates the output of a precompiled contract. 42 func RunPrecompiledContract(context inter.ChainContext, p PrecompiledContract, input []byte, contract inter.Contract) (ret []byte, err error) { 43 gas := p.RequiredGas(input) 44 if contract.UseGas(gas) { 45 return p.Run(context, input, contract.Value()) 46 } 47 return nil, ErrOutOfGas 48 }