erigon-pulse/eth/tracers/tracer_test.go
ledgerwatch 693017c554
Cleanup Tevm experimental code (#5259)
Co-authored-by: Alexey Sharp <alexeysharp@Alexeys-iMac.local>
2022-09-01 19:49:29 +01:00

211 lines
8.1 KiB
Go

// 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/holiman/uint256"
"github.com/ledgerwatch/erigon/common"
"github.com/ledgerwatch/erigon/core/state"
"github.com/ledgerwatch/erigon/core/vm"
"github.com/ledgerwatch/erigon/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.IntraBlockState
}
func (*dummyStatedb) GetRefund() uint64 { return 1337 }
func (*dummyStatedb) GetBalance(addr common.Address) *uint256.Int { return uint256.NewInt(0) }
type vmContext struct {
blockCtx vm.BlockContext
txCtx vm.TxContext
}
func testCtx() *vmContext {
return &vmContext{blockCtx: vm.BlockContext{
BlockNumber: 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{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
var (
startGas uint64 = 10000
value = uint256.NewInt(0)
)
contract := vm.NewContract(account{}, account{}, value, startGas, false)
contract.Code = []byte{byte(vm.PUSH1), 0x1, byte(vm.PUSH1), 0x1, 0x0}
tracer.CaptureStart(env, 0, contract.Caller(), contract.Address(), false, false, vm.CallType(0), []byte{}, startGas, big.NewInt(int64(value.Uint64())), contract.Code)
ret, err := env.Interpreter().Run(contract, []byte{}, false)
tracer.CaptureEnd(0, 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, string) {
t.Helper()
ctx := &vmContext{blockCtx: vm.BlockContext{
BlockNumber: 1,
}, txCtx: vm.TxContext{GasPrice: big.NewInt(100000)}}
tracer, err := New(code, new(Context))
if err != nil {
t.Fatal(err)
}
ret, err := runTrace(tracer, ctx)
if err != nil {
return nil, err.Error()
}
return ret, ""
}
for i, tt := range []struct {
code string
want string
fail 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, err := execTracer(tt.code); tt.want != string(have) || tt.fail != err {
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)
}
}
}
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; }}", new(Context))
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) {
tracer, err := New("{step: function() {}, fault: function() {}, result: function() { return null; }}", new(Context))
if err != nil {
t.Fatal(err)
}
env := vm.NewEVM(vm.BlockContext{
BlockNumber: 1,
}, vm.TxContext{}, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
contract := vm.NewContract(&account{}, &account{}, uint256.NewInt(0), 0, false)
tracer.CaptureState(env, 0, 0, 0, 0, &vm.ScopeContext{Contract: contract}, nil, 0, nil) //nolint:errcheck
timeout := errors.New("stahp")
tracer.Stop(timeout)
tracer.CaptureState(env, 0, 0, 0, 0, &vm.ScopeContext{Contract: contract}, nil, 0, nil) //nolint:errcheck
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{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
startGas := uint64(10000)
contract := vm.NewContract(account{}, account{}, uint256.NewInt(1), startGas, true)
tracer.CaptureStart(env, 0, contract.Caller(), contract.Address(), false, false, vm.CALLT, nil, 0, big.NewInt(0), nil)
tracer.CaptureEnd(0, nil, startGas-contract.Gas, 1, 0, nil)
return tracer.GetResult()
}
execTracer := func(code string) []byte {
t.Helper()
ctx := &vmContext{blockCtx: vm.BlockContext{BlockNumber: 1}, txCtx: vm.TxContext{GasPrice: big.NewInt(100000)}}
tracer, err := New(code, new(Context))
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)
}
}
}