1f1ea18b54
This commit replaces the deep-copy based state revert mechanism with a linear complexity journal. This commit also hides several internal StateDB methods to limit the number of ways in which calling code can use the journal incorrectly. As usual consultation and bug fixes to the initial implementation were provided by @karalabe, @obscuren and @Arachnid. Thank you!
202 lines
6.8 KiB
Go
202 lines
6.8 KiB
Go
// Copyright 2016 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 ethapi
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import (
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"errors"
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"math/big"
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"reflect"
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"testing"
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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/vm"
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"github.com/ethereum/go-ethereum/crypto"
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)
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type ruleSet struct{}
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func (self *ruleSet) IsHomestead(*big.Int) bool { return true }
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type Env struct {
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gasLimit *big.Int
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depth int
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evm *vm.EVM
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}
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func NewEnv(config *vm.Config) *Env {
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env := &Env{gasLimit: big.NewInt(10000), depth: 0}
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env.evm = vm.New(env, *config)
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return env
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}
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func (self *Env) RuleSet() vm.RuleSet { return &ruleSet{} }
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func (self *Env) Vm() vm.Vm { return self.evm }
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func (self *Env) Origin() common.Address { return common.Address{} }
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func (self *Env) BlockNumber() *big.Int { return big.NewInt(0) }
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//func (self *Env) PrevHash() []byte { return self.parent }
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func (self *Env) Coinbase() common.Address { return common.Address{} }
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func (self *Env) SnapshotDatabase() int { return 0 }
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func (self *Env) RevertToSnapshot(int) {}
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func (self *Env) Time() *big.Int { return big.NewInt(time.Now().Unix()) }
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func (self *Env) Difficulty() *big.Int { return big.NewInt(0) }
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func (self *Env) Db() vm.Database { return nil }
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func (self *Env) GasLimit() *big.Int { return self.gasLimit }
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func (self *Env) VmType() vm.Type { return vm.StdVmTy }
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func (self *Env) GetHash(n uint64) common.Hash {
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return common.BytesToHash(crypto.Keccak256([]byte(big.NewInt(int64(n)).String())))
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}
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func (self *Env) AddLog(log *vm.Log) {
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}
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func (self *Env) Depth() int { return self.depth }
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func (self *Env) SetDepth(i int) { self.depth = i }
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func (self *Env) CanTransfer(from common.Address, balance *big.Int) bool {
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return true
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}
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func (self *Env) Transfer(from, to vm.Account, amount *big.Int) {}
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func (self *Env) Call(caller vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
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return nil, nil
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}
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func (self *Env) CallCode(caller vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
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return nil, nil
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}
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func (self *Env) Create(caller vm.ContractRef, data []byte, gas, price, value *big.Int) ([]byte, common.Address, error) {
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return nil, common.Address{}, nil
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}
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func (self *Env) DelegateCall(me vm.ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error) {
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return nil, nil
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}
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type account struct{}
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func (account) SubBalance(amount *big.Int) {}
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func (account) AddBalance(amount *big.Int) {}
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func (account) SetAddress(common.Address) {}
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func (account) Value() *big.Int { return nil }
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func (account) SetBalance(*big.Int) {}
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func (account) SetNonce(uint64) {}
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func (account) Balance() *big.Int { return nil }
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func (account) Address() common.Address { return common.Address{} }
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func (account) ReturnGas(*big.Int, *big.Int) {}
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func (account) SetCode(common.Hash, []byte) {}
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func (account) ForEachStorage(cb func(key, value common.Hash) bool) {}
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func runTrace(tracer *JavascriptTracer) (interface{}, error) {
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env := NewEnv(&vm.Config{Debug: true, Tracer: tracer})
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contract := vm.NewContract(account{}, account{}, big.NewInt(0), env.GasLimit(), big.NewInt(1))
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contract.Code = []byte{byte(vm.PUSH1), 0x1, byte(vm.PUSH1), 0x1, 0x0}
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_, err := env.Vm().Run(contract, []byte{})
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if err != nil {
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return nil, err
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}
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return tracer.GetResult()
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}
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func TestTracing(t *testing.T) {
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tracer, err := NewJavascriptTracer("{count: 0, step: function() { this.count += 1; }, result: function() { return this.count; }}")
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if err != nil {
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t.Fatal(err)
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}
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ret, err := runTrace(tracer)
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if err != nil {
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t.Fatal(err)
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}
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value, ok := ret.(float64)
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if !ok {
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t.Errorf("Expected return value to be float64, was %T", ret)
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}
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if value != 3 {
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t.Errorf("Expected return value to be 3, got %v", value)
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}
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}
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func TestStack(t *testing.T) {
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tracer, err := NewJavascriptTracer("{depths: [], step: function(log) { this.depths.push(log.stack.length()); }, result: function() { return this.depths; }}")
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if err != nil {
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t.Fatal(err)
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}
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ret, err := runTrace(tracer)
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if err != nil {
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t.Fatal(err)
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}
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expected := []int{0, 1, 2}
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if !reflect.DeepEqual(ret, expected) {
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t.Errorf("Expected return value to be %#v, got %#v", expected, ret)
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}
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}
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func TestOpcodes(t *testing.T) {
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tracer, err := NewJavascriptTracer("{opcodes: [], step: function(log) { this.opcodes.push(log.op.toString()); }, result: function() { return this.opcodes; }}")
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if err != nil {
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t.Fatal(err)
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}
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ret, err := runTrace(tracer)
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if err != nil {
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t.Fatal(err)
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}
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expected := []string{"PUSH1", "PUSH1", "STOP"}
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if !reflect.DeepEqual(ret, expected) {
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t.Errorf("Expected return value to be %#v, got %#v", expected, ret)
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}
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}
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func TestHalt(t *testing.T) {
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timeout := errors.New("stahp")
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tracer, err := NewJavascriptTracer("{step: function() { while(1); }, result: function() { return null; }}")
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if err != nil {
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t.Fatal(err)
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}
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go func() {
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time.Sleep(1 * time.Second)
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tracer.Stop(timeout)
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}()
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if _, err = runTrace(tracer); err.Error() != "stahp in server-side tracer function 'step'" {
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t.Errorf("Expected timeout error, got %v", err)
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}
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}
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func TestHaltBetweenSteps(t *testing.T) {
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tracer, err := NewJavascriptTracer("{step: function() {}, result: function() { return null; }}")
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if err != nil {
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t.Fatal(err)
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}
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env := NewEnv(&vm.Config{Debug: true, Tracer: tracer})
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contract := vm.NewContract(&account{}, &account{}, big.NewInt(0), big.NewInt(0), big.NewInt(0))
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tracer.CaptureState(env, 0, 0, big.NewInt(0), big.NewInt(0), nil, nil, contract, 0, nil)
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timeout := errors.New("stahp")
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tracer.Stop(timeout)
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tracer.CaptureState(env, 0, 0, big.NewInt(0), big.NewInt(0), nil, nil, contract, 0, nil)
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if _, err := tracer.GetResult(); err.Error() != "stahp in server-side tracer function 'step'" {
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t.Errorf("Expected timeout error, got %v", err)
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}
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}
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