f0cbebb19f
Added chain configuration options and write out during genesis database insertion. If no "config" was found, nothing is written to the database. Configurations are written on a per genesis base. This means that any chain (which is identified by it's genesis hash) can have their own chain settings.
145 lines
3.9 KiB
Go
145 lines
3.9 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package runtime
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import (
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"math/big"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/ethdb"
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)
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// The default, always homestead, rule set for the vm env
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type ruleSet struct{}
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func (ruleSet) IsHomestead(*big.Int) bool { return true }
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// Config is a basic type specifying certain configuration flags for running
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// the EVM.
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type Config struct {
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RuleSet vm.RuleSet
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Difficulty *big.Int
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Origin common.Address
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Coinbase common.Address
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BlockNumber *big.Int
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Time *big.Int
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GasLimit *big.Int
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GasPrice *big.Int
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Value *big.Int
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DisableJit bool // "disable" so it's enabled by default
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Debug bool
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State *state.StateDB
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GetHashFn func(n uint64) common.Hash
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}
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// sets defaults on the config
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func setDefaults(cfg *Config) {
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if cfg.RuleSet == nil {
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cfg.RuleSet = ruleSet{}
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}
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if cfg.Difficulty == nil {
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cfg.Difficulty = new(big.Int)
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}
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if cfg.Time == nil {
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cfg.Time = big.NewInt(time.Now().Unix())
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}
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if cfg.GasLimit == nil {
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cfg.GasLimit = new(big.Int).Set(common.MaxBig)
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}
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if cfg.GasPrice == nil {
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cfg.GasPrice = new(big.Int)
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}
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if cfg.Value == nil {
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cfg.Value = new(big.Int)
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}
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if cfg.BlockNumber == nil {
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cfg.BlockNumber = new(big.Int)
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}
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if cfg.GetHashFn == nil {
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cfg.GetHashFn = func(n uint64) common.Hash {
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return common.BytesToHash(crypto.Keccak256([]byte(new(big.Int).SetUint64(n).String())))
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}
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}
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}
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// Execute executes the code using the input as call data during the execution.
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// It returns the EVM's return value, the new state and an error if it failed.
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//
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// Executes sets up a in memory, temporarily, environment for the execution of
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// the given code. It enabled the JIT by default and make sure that it's restored
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// to it's original state afterwards.
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func Execute(code, input []byte, cfg *Config) ([]byte, *state.StateDB, error) {
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if cfg == nil {
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cfg = new(Config)
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}
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setDefaults(cfg)
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if cfg.State == nil {
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db, _ := ethdb.NewMemDatabase()
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cfg.State, _ = state.New(common.Hash{}, db)
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}
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var (
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vmenv = NewEnv(cfg, cfg.State)
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sender = cfg.State.CreateAccount(cfg.Origin)
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receiver = cfg.State.CreateAccount(common.StringToAddress("contract"))
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)
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// set the receiver's (the executing contract) code for execution.
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receiver.SetCode(code)
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// Call the code with the given configuration.
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ret, err := vmenv.Call(
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sender,
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receiver.Address(),
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input,
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cfg.GasLimit,
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cfg.GasPrice,
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cfg.Value,
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)
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return ret, cfg.State, err
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}
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// Call executes the code given by the contract's address. It will return the
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// EVM's return value or an error if it failed.
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//
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// Call, unlike Execute, requires a config and also requires the State field to
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// be set.
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func Call(address common.Address, input []byte, cfg *Config) ([]byte, error) {
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setDefaults(cfg)
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vmenv := NewEnv(cfg, cfg.State)
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sender := cfg.State.GetOrNewStateObject(cfg.Origin)
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// Call the code with the given configuration.
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ret, err := vmenv.Call(
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sender,
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address,
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input,
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cfg.GasLimit,
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cfg.GasPrice,
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cfg.Value,
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)
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return ret, err
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}
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