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- // Copyright 2017 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 tracers
- import (
- "encoding/json"
- "errors"
- "math/big"
- "testing"
- "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/params"
- )
- 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) {}
- func (account) SetCode(common.Hash, []byte) {}
- func (account) ForEachStorage(cb func(key, value common.Hash) bool) {}
- type dummyStatedb struct {
- state.StateDB
- }
- func (*dummyStatedb) GetRefund() uint64 { return 1337 }
- func (*dummyStatedb) GetBalance(addr common.Address) *big.Int { return new(big.Int) }
- type vmContext struct {
- blockCtx vm.BlockContext
- txCtx vm.TxContext
- }
- func testCtx() *vmContext {
- return &vmContext{blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)}, txCtx: vm.TxContext{GasPrice: big.NewInt(100000)}}
- }
- func runTrace(tracer *Tracer, vmctx *vmContext) (json.RawMessage, error) {
- env := vm.NewEVM(vmctx.blockCtx, vmctx.txCtx, &dummyStatedb{}, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
- var (
- startGas uint64 = 10000
- value = big.NewInt(0)
- )
- contract := vm.NewContract(account{}, account{}, value, startGas)
- contract.Code = []byte{byte(vm.PUSH1), 0x1, byte(vm.PUSH1), 0x1, 0x0}
- tracer.CaptureStart(env, contract.Caller(), contract.Address(), false, []byte{}, startGas, value)
- ret, err := env.Interpreter().Run(contract, []byte{}, false)
- tracer.CaptureEnd(ret, startGas-contract.Gas, 1, err)
- if err != nil {
- return nil, err
- }
- return tracer.GetResult()
- }
- func TestTracer(t *testing.T) {
- execTracer := func(code string) []byte {
- t.Helper()
- ctx := &vmContext{blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)}, txCtx: vm.TxContext{GasPrice: big.NewInt(100000)}}
- tracer, err := New(code, ctx.txCtx)
- if err != nil {
- t.Fatal(err)
- }
- ret, err := runTrace(tracer, ctx)
- if err != nil {
- t.Fatal(err)
- }
- return ret
- }
- for i, tt := range []struct {
- code string
- want string
- }{
- { // tests that we don't panic on bad arguments to memory access
- code: "{depths: [], step: function(log) { this.depths.push(log.memory.slice(-1,-2)); }, fault: function() {}, result: function() { return this.depths; }}",
- want: `[{},{},{}]`,
- }, { // tests that we don't panic on bad arguments to stack peeks
- code: "{depths: [], step: function(log) { this.depths.push(log.stack.peek(-1)); }, fault: function() {}, result: function() { return this.depths; }}",
- want: `["0","0","0"]`,
- }, { // tests that we don't panic on bad arguments to memory getUint
- code: "{ depths: [], step: function(log, db) { this.depths.push(log.memory.getUint(-64));}, fault: function() {}, result: function() { return this.depths; }}",
- want: `["0","0","0"]`,
- }, { // tests some general counting
- code: "{count: 0, step: function() { this.count += 1; }, fault: function() {}, result: function() { return this.count; }}",
- want: `3`,
- }, { // tests that depth is reported correctly
- code: "{depths: [], step: function(log) { this.depths.push(log.stack.length()); }, fault: function() {}, result: function() { return this.depths; }}",
- want: `[0,1,2]`,
- }, { // tests to-string of opcodes
- code: "{opcodes: [], step: function(log) { this.opcodes.push(log.op.toString()); }, fault: function() {}, result: function() { return this.opcodes; }}",
- want: `["PUSH1","PUSH1","STOP"]`,
- }, { // tests intrinsic gas
- code: "{depths: [], step: function() {}, fault: function() {}, result: function(ctx) { return ctx.gasPrice+'.'+ctx.gasUsed+'.'+ctx.intrinsicGas; }}",
- want: `"100000.6.21000"`,
- },
- } {
- if have := execTracer(tt.code); tt.want != string(have) {
- t.Errorf("testcase %d: expected return value to be %s got %s\n\tcode: %v", i, tt.want, string(have), tt.code)
- }
- }
- }
- func TestHalt(t *testing.T) {
- t.Skip("duktape doesn't support abortion")
- timeout := errors.New("stahp")
- vmctx := testCtx()
- tracer, err := New("{step: function() { while(1); }, result: function() { return null; }}", vmctx.txCtx)
- if err != nil {
- t.Fatal(err)
- }
- go func() {
- time.Sleep(1 * time.Second)
- tracer.Stop(timeout)
- }()
- if _, err = runTrace(tracer, vmctx); err.Error() != "stahp in server-side tracer function 'step'" {
- t.Errorf("Expected timeout error, got %v", err)
- }
- }
- func TestHaltBetweenSteps(t *testing.T) {
- vmctx := testCtx()
- tracer, err := New("{step: function() {}, fault: function() {}, result: function() { return null; }}", vmctx.txCtx)
- if err != nil {
- t.Fatal(err)
- }
- env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{}, &dummyStatedb{}, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
- scope := &vm.ScopeContext{
- Contract: vm.NewContract(&account{}, &account{}, big.NewInt(0), 0),
- }
- tracer.CaptureState(env, 0, 0, 0, 0, scope, nil, 0, nil)
- timeout := errors.New("stahp")
- tracer.Stop(timeout)
- tracer.CaptureState(env, 0, 0, 0, 0, scope, nil, 0, nil)
- if _, err := tracer.GetResult(); err.Error() != timeout.Error() {
- t.Errorf("Expected timeout error, got %v", err)
- }
- }
- // TestNoStepExec tests a regular value transfer (no exec), and accessing the statedb
- // in 'result'
- func TestNoStepExec(t *testing.T) {
- runEmptyTrace := func(tracer *Tracer, vmctx *vmContext) (json.RawMessage, error) {
- env := vm.NewEVM(vmctx.blockCtx, vmctx.txCtx, &dummyStatedb{}, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
- startGas := uint64(10000)
- contract := vm.NewContract(account{}, account{}, big.NewInt(0), startGas)
- tracer.CaptureStart(env, contract.Caller(), contract.Address(), false, []byte{}, startGas, big.NewInt(0))
- tracer.CaptureEnd(nil, startGas-contract.Gas, 1, nil)
- return tracer.GetResult()
- }
- execTracer := func(code string) []byte {
- t.Helper()
- ctx := &vmContext{blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)}, txCtx: vm.TxContext{GasPrice: big.NewInt(100000)}}
- tracer, err := New(code, ctx.txCtx)
- if err != nil {
- t.Fatal(err)
- }
- ret, err := runEmptyTrace(tracer, ctx)
- if err != nil {
- t.Fatal(err)
- }
- return ret
- }
- for i, tt := range []struct {
- code string
- want string
- }{
- { // tests that we don't panic on accessing the db methods
- code: "{depths: [], step: function() {}, fault: function() {}, result: function(ctx, db){ return db.getBalance(ctx.to)} }",
- want: `"0"`,
- },
- } {
- if have := execTracer(tt.code); tt.want != string(have) {
- t.Errorf("testcase %d: expected return value to be %s got %s\n\tcode: %v", i, tt.want, string(have), tt.code)
- }
- }
- }
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