forked from cerc-io/plugeth
210 lines
8.3 KiB
Go
210 lines
8.3 KiB
Go
// Copyright 2017 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 tracers
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import (
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"encoding/json"
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"errors"
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"math/big"
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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/state"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/params"
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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) {}
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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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type dummyStatedb struct {
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state.StateDB
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}
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func (*dummyStatedb) GetRefund() uint64 { return 1337 }
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func (*dummyStatedb) GetBalance(addr common.Address) *big.Int { return new(big.Int) }
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type vmContext struct {
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blockCtx vm.BlockContext
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txCtx vm.TxContext
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}
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func testCtx() *vmContext {
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return &vmContext{blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)}, txCtx: vm.TxContext{GasPrice: big.NewInt(100000)}}
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}
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func runTrace(tracer *Tracer, vmctx *vmContext) (json.RawMessage, error) {
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env := vm.NewEVM(vmctx.blockCtx, vmctx.txCtx, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
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var (
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startGas uint64 = 10000
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value = big.NewInt(0)
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)
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contract := vm.NewContract(account{}, account{}, value, startGas)
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contract.Code = []byte{byte(vm.PUSH1), 0x1, byte(vm.PUSH1), 0x1, 0x0}
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tracer.CaptureStart(env, contract.Caller(), contract.Address(), false, []byte{}, startGas, value)
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ret, err := env.Interpreter().Run(contract, []byte{}, false)
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tracer.CaptureEnd(ret, startGas-contract.Gas, 1, err)
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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 TestTracer(t *testing.T) {
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execTracer := func(code string) ([]byte, string) {
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t.Helper()
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ctx := &vmContext{blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)}, txCtx: vm.TxContext{GasPrice: big.NewInt(100000)}}
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tracer, err := New(code, ctx.txCtx)
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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, ctx)
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if err != nil {
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return nil, err.Error() // Stringify to allow comparison without nil checks
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}
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return ret, ""
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}
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for i, tt := range []struct {
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code string
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want string
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fail string
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}{
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{ // tests that we don't panic on bad arguments to memory access
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code: "{depths: [], step: function(log) { this.depths.push(log.memory.slice(-1,-2)); }, fault: function() {}, result: function() { return this.depths; }}",
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want: `[{},{},{}]`,
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}, { // tests that we don't panic on bad arguments to stack peeks
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code: "{depths: [], step: function(log) { this.depths.push(log.stack.peek(-1)); }, fault: function() {}, result: function() { return this.depths; }}",
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want: `["0","0","0"]`,
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}, { // tests that we don't panic on bad arguments to memory getUint
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code: "{ depths: [], step: function(log, db) { this.depths.push(log.memory.getUint(-64));}, fault: function() {}, result: function() { return this.depths; }}",
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want: `["0","0","0"]`,
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}, { // tests some general counting
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code: "{count: 0, step: function() { this.count += 1; }, fault: function() {}, result: function() { return this.count; }}",
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want: `3`,
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}, { // tests that depth is reported correctly
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code: "{depths: [], step: function(log) { this.depths.push(log.stack.length()); }, fault: function() {}, result: function() { return this.depths; }}",
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want: `[0,1,2]`,
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}, { // tests to-string of opcodes
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code: "{opcodes: [], step: function(log) { this.opcodes.push(log.op.toString()); }, fault: function() {}, result: function() { return this.opcodes; }}",
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want: `["PUSH1","PUSH1","STOP"]`,
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}, { // tests intrinsic gas
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code: "{depths: [], step: function() {}, fault: function() {}, result: function(ctx) { return ctx.gasPrice+'.'+ctx.gasUsed+'.'+ctx.intrinsicGas; }}",
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want: `"100000.6.21000"`,
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}, { // tests too deep object / serialization crash
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code: "{step: function() {}, fault: function() {}, result: function() { var o={}; var x=o; for (var i=0; i<1000; i++){ o.foo={}; o=o.foo; } return x; }}",
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fail: "RangeError: json encode recursion limit in server-side tracer function 'result'",
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},
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} {
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if have, err := execTracer(tt.code); tt.want != string(have) || tt.fail != err {
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t.Errorf("testcase %d: expected return value to be '%s' got '%s', error to be '%s' got '%s'\n\tcode: %v", i, tt.want, string(have), tt.fail, err, tt.code)
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}
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}
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}
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func TestHalt(t *testing.T) {
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t.Skip("duktape doesn't support abortion")
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timeout := errors.New("stahp")
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vmctx := testCtx()
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tracer, err := New("{step: function() { while(1); }, result: function() { return null; }}", vmctx.txCtx)
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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, vmctx); 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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vmctx := testCtx()
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tracer, err := New("{step: function() {}, fault: function() {}, result: function() { return null; }}", vmctx.txCtx)
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if err != nil {
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t.Fatal(err)
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}
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env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{}, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
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scope := &vm.ScopeContext{
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Contract: vm.NewContract(&account{}, &account{}, big.NewInt(0), 0),
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}
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tracer.CaptureState(env, 0, 0, 0, 0, scope, nil, 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, 0, 0, scope, nil, 0, nil)
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if _, err := tracer.GetResult(); err.Error() != timeout.Error() {
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t.Errorf("Expected timeout error, got %v", err)
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}
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}
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// TestNoStepExec tests a regular value transfer (no exec), and accessing the statedb
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// in 'result'
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func TestNoStepExec(t *testing.T) {
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runEmptyTrace := func(tracer *Tracer, vmctx *vmContext) (json.RawMessage, error) {
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env := vm.NewEVM(vmctx.blockCtx, vmctx.txCtx, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
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startGas := uint64(10000)
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contract := vm.NewContract(account{}, account{}, big.NewInt(0), startGas)
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tracer.CaptureStart(env, contract.Caller(), contract.Address(), false, []byte{}, startGas, big.NewInt(0))
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tracer.CaptureEnd(nil, startGas-contract.Gas, 1, nil)
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return tracer.GetResult()
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}
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execTracer := func(code string) []byte {
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t.Helper()
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ctx := &vmContext{blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)}, txCtx: vm.TxContext{GasPrice: big.NewInt(100000)}}
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tracer, err := New(code, ctx.txCtx)
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if err != nil {
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t.Fatal(err)
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}
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ret, err := runEmptyTrace(tracer, ctx)
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if err != nil {
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t.Fatal(err)
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}
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return ret
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}
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for i, tt := range []struct {
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code string
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want string
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}{
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{ // tests that we don't panic on accessing the db methods
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code: "{depths: [], step: function() {}, fault: function() {}, result: function(ctx, db){ return db.getBalance(ctx.to)} }",
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want: `"0"`,
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},
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} {
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if have := execTracer(tt.code); tt.want != string(have) {
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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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}
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}
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}
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