add runtime validator contract call

core/vm/validator/env.go

@@ -0,0 +1,25 @@
+package validator
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/vm"
+)
+
+func NewEnv(cfg *Config) *vm.EVM {
+	context := vm.Context{
+		CanTransfer: core.CanTransfer,
+		Transfer:    core.Transfer,
+		GetHash:     func(uint64) common.Hash { return common.Hash{} },
+
+		Origin:      cfg.Origin,
+		Coinbase:    cfg.Coinbase,
+		BlockNumber: cfg.BlockNumber,
+		Time:        cfg.Time,
+		Difficulty:  cfg.Difficulty,
+		GasLimit:    cfg.GasLimit,
+		GasPrice:    cfg.GasPrice,
+	}
+
+	return vm.NewEVM(context, cfg.State, cfg.ChainConfig, cfg.EVMConfig)
+}

core/vm/validator/runtime.go

@@ -0,0 +1,156 @@
+package validator
+
+import (
+	"math"
+	"math/big"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/state"
+	"github.com/ethereum/go-ethereum/core/vm"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/ethdb"
+	"github.com/ethereum/go-ethereum/params"
+)
+
+// Config is a basic type specifying certain configuration flags for running
+// the EVM.
+type Config struct {
+	ChainConfig *params.ChainConfig
+	Difficulty  *big.Int
+	Origin      common.Address
+	Coinbase    common.Address
+	BlockNumber *big.Int
+	Time        *big.Int
+	GasLimit    uint64
+	GasPrice    *big.Int
+	Value       *big.Int
+	Debug       bool
+	EVMConfig   vm.Config
+
+	State     *state.StateDB
+	GetHashFn func(n uint64) common.Hash
+}
+
+// sets defaults on the config
+func setDefaults(cfg *Config) {
+	if cfg.ChainConfig == nil {
+		cfg.ChainConfig = &params.ChainConfig{
+			ChainId:        big.NewInt(1),
+			HomesteadBlock: new(big.Int),
+			DAOForkBlock:   new(big.Int),
+			DAOForkSupport: false,
+			EIP150Block:    new(big.Int),
+			EIP155Block:    new(big.Int),
+			EIP158Block:    new(big.Int),
+		}
+	}
+
+	if cfg.Difficulty == nil {
+		cfg.Difficulty = new(big.Int)
+	}
+	if cfg.Time == nil {
+		cfg.Time = big.NewInt(time.Now().Unix())
+	}
+	if cfg.GasLimit == 0 {
+		cfg.GasLimit = math.MaxUint64
+	}
+	if cfg.GasPrice == nil {
+		cfg.GasPrice = new(big.Int)
+	}
+	if cfg.Value == nil {
+		cfg.Value = new(big.Int)
+	}
+	if cfg.BlockNumber == nil {
+		cfg.BlockNumber = new(big.Int)
+	}
+	if cfg.GetHashFn == nil {
+		cfg.GetHashFn = func(n uint64) common.Hash {
+			return common.BytesToHash(crypto.Keccak256([]byte(new(big.Int).SetUint64(n).String())))
+		}
+	}
+}
+
+// Execute executes the code using the input as call data during the execution.
+// It returns the EVM's return value, the new state and an error if it failed.
+//
+// Executes sets up a in memory, temporarily, environment for the execution of
+// the given code. It makes sure that it's restored to it's original state afterwards.
+func Execute(code, input []byte, cfg *Config) ([]byte, *state.StateDB, error) {
+	if cfg == nil {
+		cfg = new(Config)
+	}
+	setDefaults(cfg)
+
+	if cfg.State == nil {
+		db, _ := ethdb.NewMemDatabase()
+		cfg.State, _ = state.New(common.Hash{}, state.NewDatabase(db))
+	}
+	var (
+		address = common.StringToAddress("contract")
+		vmenv   = NewEnv(cfg)
+		sender  = vm.AccountRef(cfg.Origin)
+	)
+	cfg.State.CreateAccount(address)
+	// set the receiver's (the executing contract) code for execution.
+	cfg.State.SetCode(address, code)
+	// Call the code with the given configuration.
+	ret, _, err := vmenv.Call(
+		sender,
+		common.StringToAddress("contract"),
+		input,
+		cfg.GasLimit,
+		cfg.Value,
+	)
+
+	return ret, cfg.State, err
+}
+
+// Create executes the code using the EVM create method
+func Create(input []byte, cfg *Config) ([]byte, common.Address, uint64, error) {
+	if cfg == nil {
+		cfg = new(Config)
+	}
+	setDefaults(cfg)
+
+	if cfg.State == nil {
+		db, _ := ethdb.NewMemDatabase()
+		cfg.State, _ = state.New(common.Hash{}, state.NewDatabase(db))
+	}
+	var (
+		vmenv  = NewEnv(cfg)
+		sender = vm.AccountRef(cfg.Origin)
+	)
+
+	// Call the code with the given configuration.
+	code, address, leftOverGas, err := vmenv.Create(
+		sender,
+		input,
+		cfg.GasLimit,
+		cfg.Value,
+	)
+	return code, address, leftOverGas, err
+}
+
+// Call executes the code given by the contract's address. It will return the
+// EVM's return value or an error if it failed.
+//
+// Call, unlike Execute, requires a config and also requires the State field to
+// be set.
+func Call(address common.Address, input []byte, cfg *Config) ([]byte, uint64, error) {
+	setDefaults(cfg)
+
+	vmenv := NewEnv(cfg)
+
+	sender := cfg.State.GetOrNewStateObject(cfg.Origin)
+	// Call the code with the given configuration.
+	ret, leftOverGas, err := vmenv.Call(
+		sender,
+		address,
+		input,
+		cfg.GasLimit,
+		cfg.Value,
+	)
+
+	return ret, leftOverGas, err
+}

core/vm/validator/runtime_test.go

@@ -0,0 +1,135 @@
+package validator
+
+import (
+	"math/big"
+	"strings"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/accounts/abi"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/state"
+	"github.com/ethereum/go-ethereum/core/vm"
+	"github.com/ethereum/go-ethereum/ethdb"
+)
+
+func TestDefaults(t *testing.T) {
+	cfg := new(Config)
+	setDefaults(cfg)
+
+	if cfg.Difficulty == nil {
+		t.Error("expected difficulty to be non nil")
+	}
+
+	if cfg.Time == nil {
+		t.Error("expected time to be non nil")
+	}
+	if cfg.GasLimit == 0 {
+		t.Error("didn't expect gaslimit to be zero")
+	}
+	if cfg.GasPrice == nil {
+		t.Error("expected time to be non nil")
+	}
+	if cfg.Value == nil {
+		t.Error("expected time to be non nil")
+	}
+	if cfg.GetHashFn == nil {
+		t.Error("expected time to be non nil")
+	}
+	if cfg.BlockNumber == nil {
+		t.Error("expected block number to be non nil")
+	}
+}
+
+func TestEVM(t *testing.T) {
+	defer func() {
+		if r := recover(); r != nil {
+			t.Fatalf("crashed with: %v", r)
+		}
+	}()
+
+	Execute([]byte{
+		byte(vm.DIFFICULTY),
+		byte(vm.TIMESTAMP),
+		byte(vm.GASLIMIT),
+		byte(vm.PUSH1),
+		byte(vm.ORIGIN),
+		byte(vm.BLOCKHASH),
+		byte(vm.COINBASE),
+	}, nil, nil)
+}
+
+func TestExecute(t *testing.T) {
+	ret, _, err := Execute([]byte{
+		byte(vm.PUSH1), 10,
+		byte(vm.PUSH1), 0,
+		byte(vm.MSTORE),
+		byte(vm.PUSH1), 32,
+		byte(vm.PUSH1), 0,
+		byte(vm.RETURN),
+	}, nil, nil)
+	if err != nil {
+		t.Fatal("didn't expect error", err)
+	}
+
+	num := new(big.Int).SetBytes(ret)
+	if num.Cmp(big.NewInt(10)) != 0 {
+		t.Error("Expected 10, got", num)
+	}
+}
+
+func TestCall(t *testing.T) {
+	db, _ := ethdb.NewMemDatabase()
+	state, _ := state.New(common.Hash{}, state.NewDatabase(db))
+	address := common.HexToAddress("0x0a")
+	state.SetCode(address, []byte{
+		byte(vm.PUSH1), 10,
+		byte(vm.PUSH1), 0,
+		byte(vm.MSTORE),
+		byte(vm.PUSH1), 32,
+		byte(vm.PUSH1), 0,
+		byte(vm.RETURN),
+	})
+
+	ret, _, err := Call(address, nil, &Config{State: state})
+	if err != nil {
+		t.Fatal("didn't expect error", err)
+	}
+
+	num := new(big.Int).SetBytes(ret)
+	if num.Cmp(big.NewInt(10)) != 0 {
+		t.Error("Expected 10, got", num)
+	}
+}
+
+func BenchmarkCall(b *testing.B) {
+	var definition = `[{"constant":true,"inputs":[],"name":"seller","outputs":[{"name":"","type":"address"}],"type":"function"},{"constant":false,"inputs":[],"name":"abort","outputs":[],"type":"function"},{"constant":true,"inputs":[],"name":"value","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":false,"inputs":[],"name":"refund","outputs":[],"type":"function"},{"constant":true,"inputs":[],"name":"buyer","outputs":[{"name":"","type":"address"}],"type":"function"},{"constant":false,"inputs":[],"name":"confirmReceived","outputs":[],"type":"function"},{"constant":true,"inputs":[],"name":"state","outputs":[{"name":"","type":"uint8"}],"type":"function"},{"constant":false,"inputs":[],"name":"confirmPurchase","outputs":[],"type":"function"},{"inputs":[],"type":"constructor"},{"anonymous":false,"inputs":[],"name":"Aborted","type":"event"},{"anonymous":false,"inputs":[],"name":"PurchaseConfirmed","type":"event"},{"anonymous":false,"inputs":[],"name":"ItemReceived","type":"event"},{"anonymous":false,"inputs":[],"name":"Refunded","type":"event"}]`
+
+	var code = common.Hex2Bytes("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")
+
+	abi, err := abi.JSON(strings.NewReader(definition))
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	cpurchase, err := abi.Pack("confirmPurchase")
+	if err != nil {
+		b.Fatal(err)
+	}
+	creceived, err := abi.Pack("confirmReceived")
+	if err != nil {
+		b.Fatal(err)
+	}
+	refund, err := abi.Pack("refund")
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		for j := 0; j < 400; j++ {
+			Execute(code, cpurchase, nil)
+			Execute(code, creceived, nil)
+			Execute(code, refund, nil)
+		}
+	}
+}