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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package ethapi
import (
"errors"
"math/big"
"testing"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
)
type ruleSet struct{}
func (self *ruleSet) IsHomestead(*big.Int) bool { return true }
type Env struct {
gasLimit *big.Int
depth int
evm *vm.EVM
}
func NewEnv(config *vm.Config) *Env {
env := &Env{gasLimit: big.NewInt(10000), depth: 0}
env.evm = vm.New(env, *config)
return env
}
func (self *Env) RuleSet() vm.RuleSet { return &ruleSet{} }
func (self *Env) Vm() vm.Vm { return self.evm }
func (self *Env) Origin() common.Address { return common.Address{} }
func (self *Env) BlockNumber() *big.Int { return big.NewInt(0) }
//func (self *Env) PrevHash() []byte { return self.parent }
func (self *Env) Coinbase() common.Address { return common.Address{} }
func (self *Env) MakeSnapshot() vm.Database { return nil }
func (self *Env) SetSnapshot(vm.Database) {}
func (self *Env) Time() *big.Int { return big.NewInt(time.Now().Unix()) }
func (self *Env) Difficulty() *big.Int { return big.NewInt(0) }
func (self *Env) Db() vm.Database { return nil }
func (self *Env) GasLimit() *big.Int { return self.gasLimit }
func (self *Env) VmType() vm.Type { return vm.StdVmTy }
func (self *Env) GetHash(n uint64) common.Hash {
return common.BytesToHash(crypto.Keccak256([]byte(big.NewInt(int64(n)).String())))
}
func (self *Env) AddLog(log *vm.Log) {
}
func (self *Env) Depth() int { return self.depth }
func (self *Env) SetDepth(i int) { self.depth = i }
func (self *Env) CanTransfer(from common.Address, balance *big.Int) bool {
return true
}
func (self *Env) Transfer(from, to vm.Account, amount *big.Int) {}
func (self *Env) Call(caller vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
return nil, nil
}
func (self *Env) CallCode(caller vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
return nil, nil
}
func (self *Env) Create(caller vm.ContractRef, data []byte, gas, price, value *big.Int) ([]byte, common.Address, error) {
return nil, common.Address{}, nil
}
func (self *Env) DelegateCall(me vm.ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error) {
return nil, nil
}
type account struct{}
func (account) SubBalance(amount *big.Int) {}
func (account) AddBalance(amount *big.Int) {}
func (account) SetAddress(common.Address) {}
func (account) Value() *big.Int { return nil }
func (account) SetBalance(*big.Int) {}
func (account) SetNonce(uint64) {}
func (account) Balance() *big.Int { return nil }
func (account) Address() common.Address { return common.Address{} }
func (account) ReturnGas(*big.Int, *big.Int) {}
func (account) SetCode([]byte) {}
func (account) ForEachStorage(cb func(key, value common.Hash) bool) {}
func runTrace(tracer *JavascriptTracer) (interface{}, error) {
env := NewEnv(&vm.Config{Debug: true, Tracer: tracer})
contract := vm.NewContract(account{}, account{}, big.NewInt(0), env.GasLimit(), big.NewInt(1))
contract.Code = []byte{byte(vm.PUSH1), 0x1, byte(vm.PUSH1), 0x1, 0x0}
_, err := env.Vm().Run(contract, []byte{})
if err != nil {
return nil, err
}
return tracer.GetResult()
}
func TestTracing(t *testing.T) {
tracer, err := NewJavascriptTracer("{count: 0, step: function() { this.count += 1; }, result: function() { return this.count; }}")
if err != nil {
t.Fatal(err)
}
ret, err := runTrace(tracer)
if err != nil {
t.Fatal(err)
}
value, ok := ret.(float64)
if !ok {
t.Errorf("Expected return value to be float64, was %T", ret)
}
if value != 3 {
t.Errorf("Expected return value to be 3, got %v", value)
}
}
func TestStack(t *testing.T) {
tracer, err := NewJavascriptTracer("{depths: [], step: function(log) { this.depths.push(log.stack.length()); }, result: function() { return this.depths; }}")
if err != nil {
t.Fatal(err)
}
ret, err := runTrace(tracer)
if err != nil {
t.Fatal(err)
}
value, ok := ret.([]int)
if !ok {
t.Errorf("Expected return value to be []int, was %T", ret)
}
if len(value) != 3 || value[0] != 0 || value[1] != 1 || value[2] != 2 {
t.Errorf("Expected return value to be [0 1 2], got %v", value)
}
}
func TestHalt(t *testing.T) {
timeout := errors.New("stahp")
tracer, err := NewJavascriptTracer("{step: function() { while(1); }, result: function() { return null; }}")
if err != nil {
t.Fatal(err)
}
go func() {
time.Sleep(1 * time.Second)
tracer.Stop(timeout)
}()
if _, err = runTrace(tracer); err.Error() != "stahp in server-side tracer function 'step'" {
t.Errorf("Expected timeout error, got %v", err)
}
}
func TestHaltBetweenSteps(t *testing.T) {
tracer, err := NewJavascriptTracer("{step: function() {}, result: function() { return null; }}")
if err != nil {
t.Fatal(err)
}
env := NewEnv(&vm.Config{Debug: true, Tracer: tracer})
contract := vm.NewContract(&account{}, &account{}, big.NewInt(0), big.NewInt(0), big.NewInt(0))
tracer.CaptureState(env, 0, 0, big.NewInt(0), big.NewInt(0), nil, nil, contract, 0, nil)
timeout := errors.New("stahp")
tracer.Stop(timeout)
tracer.CaptureState(env, 0, 0, big.NewInt(0), big.NewInt(0), nil, nil, contract, 0, nil)
if _, err := tracer.GetResult(); err.Error() != "stahp in server-side tracer function 'step'" {
t.Errorf("Expected timeout error, got %v", err)
}
}
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