357 lines
11 KiB
Go
357 lines
11 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 state
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"math"
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"math/big"
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"math/rand"
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"reflect"
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"strings"
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"testing"
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"testing/quick"
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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/ethdb"
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)
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// Tests that updating a state trie does not leak any database writes prior to
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// actually committing the state.
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func TestUpdateLeaks(t *testing.T) {
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// Create an empty state database
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db, _ := ethdb.NewMemDatabase()
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state, _ := New(common.Hash{}, db)
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// Update it with some accounts
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for i := byte(0); i < 255; i++ {
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addr := common.BytesToAddress([]byte{i})
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state.AddBalance(addr, big.NewInt(int64(11*i)))
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state.SetNonce(addr, uint64(42*i))
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if i%2 == 0 {
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state.SetState(addr, common.BytesToHash([]byte{i, i, i}), common.BytesToHash([]byte{i, i, i, i}))
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}
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if i%3 == 0 {
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state.SetCode(addr, []byte{i, i, i, i, i})
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}
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state.IntermediateRoot()
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}
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// Ensure that no data was leaked into the database
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for _, key := range db.Keys() {
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value, _ := db.Get(key)
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t.Errorf("State leaked into database: %x -> %x", key, value)
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}
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}
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// Tests that no intermediate state of an object is stored into the database,
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// only the one right before the commit.
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func TestIntermediateLeaks(t *testing.T) {
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// Create two state databases, one transitioning to the final state, the other final from the beginning
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transDb, _ := ethdb.NewMemDatabase()
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finalDb, _ := ethdb.NewMemDatabase()
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transState, _ := New(common.Hash{}, transDb)
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finalState, _ := New(common.Hash{}, finalDb)
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modify := func(state *StateDB, addr common.Address, i, tweak byte) {
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state.SetBalance(addr, big.NewInt(int64(11*i)+int64(tweak)))
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state.SetNonce(addr, uint64(42*i+tweak))
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if i%2 == 0 {
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state.SetState(addr, common.Hash{i, i, i, 0}, common.Hash{})
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state.SetState(addr, common.Hash{i, i, i, tweak}, common.Hash{i, i, i, i, tweak})
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}
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if i%3 == 0 {
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state.SetCode(addr, []byte{i, i, i, i, i, tweak})
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}
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}
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// Modify the transient state.
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for i := byte(0); i < 255; i++ {
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modify(transState, common.Address{byte(i)}, i, 0)
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}
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// Write modifications to trie.
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transState.IntermediateRoot()
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// Overwrite all the data with new values in the transient database.
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for i := byte(0); i < 255; i++ {
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modify(transState, common.Address{byte(i)}, i, 99)
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modify(finalState, common.Address{byte(i)}, i, 99)
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}
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// Commit and cross check the databases.
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if _, err := transState.Commit(); err != nil {
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t.Fatalf("failed to commit transition state: %v", err)
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}
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if _, err := finalState.Commit(); err != nil {
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t.Fatalf("failed to commit final state: %v", err)
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}
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for _, key := range finalDb.Keys() {
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if _, err := transDb.Get(key); err != nil {
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val, _ := finalDb.Get(key)
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t.Errorf("entry missing from the transition database: %x -> %x", key, val)
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}
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}
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for _, key := range transDb.Keys() {
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if _, err := finalDb.Get(key); err != nil {
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val, _ := transDb.Get(key)
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t.Errorf("extra entry in the transition database: %x -> %x", key, val)
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}
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}
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}
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func TestSnapshotRandom(t *testing.T) {
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config := &quick.Config{MaxCount: 1000}
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err := quick.Check((*snapshotTest).run, config)
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if cerr, ok := err.(*quick.CheckError); ok {
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test := cerr.In[0].(*snapshotTest)
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t.Errorf("%v:\n%s", test.err, test)
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} else if err != nil {
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t.Error(err)
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}
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}
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// A snapshotTest checks that reverting StateDB snapshots properly undoes all changes
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// captured by the snapshot. Instances of this test with pseudorandom content are created
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// by Generate.
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//
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// The test works as follows:
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//
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// A new state is created and all actions are applied to it. Several snapshots are taken
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// in between actions. The test then reverts each snapshot. For each snapshot the actions
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// leading up to it are replayed on a fresh, empty state. The behaviour of all public
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// accessor methods on the reverted state must match the return value of the equivalent
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// methods on the replayed state.
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type snapshotTest struct {
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addrs []common.Address // all account addresses
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actions []testAction // modifications to the state
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snapshots []int // actions indexes at which snapshot is taken
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err error // failure details are reported through this field
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}
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type testAction struct {
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name string
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fn func(testAction, *StateDB)
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args []int64
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noAddr bool
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}
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// newTestAction creates a random action that changes state.
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func newTestAction(addr common.Address, r *rand.Rand) testAction {
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actions := []testAction{
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{
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name: "SetBalance",
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fn: func(a testAction, s *StateDB) {
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s.SetBalance(addr, big.NewInt(a.args[0]))
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},
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args: make([]int64, 1),
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},
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{
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name: "AddBalance",
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fn: func(a testAction, s *StateDB) {
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s.AddBalance(addr, big.NewInt(a.args[0]))
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},
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args: make([]int64, 1),
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},
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{
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name: "SetNonce",
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fn: func(a testAction, s *StateDB) {
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s.SetNonce(addr, uint64(a.args[0]))
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},
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args: make([]int64, 1),
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},
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{
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name: "SetState",
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fn: func(a testAction, s *StateDB) {
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var key, val common.Hash
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binary.BigEndian.PutUint16(key[:], uint16(a.args[0]))
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binary.BigEndian.PutUint16(val[:], uint16(a.args[1]))
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s.SetState(addr, key, val)
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},
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args: make([]int64, 2),
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},
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{
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name: "SetCode",
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fn: func(a testAction, s *StateDB) {
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code := make([]byte, 16)
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binary.BigEndian.PutUint64(code, uint64(a.args[0]))
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binary.BigEndian.PutUint64(code[8:], uint64(a.args[1]))
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s.SetCode(addr, code)
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},
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args: make([]int64, 2),
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},
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{
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name: "CreateAccount",
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fn: func(a testAction, s *StateDB) {
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s.CreateAccount(addr)
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},
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},
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{
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name: "Suicide",
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fn: func(a testAction, s *StateDB) {
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s.Suicide(addr)
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},
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},
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{
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name: "AddRefund",
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fn: func(a testAction, s *StateDB) {
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s.AddRefund(big.NewInt(a.args[0]))
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},
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args: make([]int64, 1),
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noAddr: true,
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},
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{
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name: "AddLog",
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fn: func(a testAction, s *StateDB) {
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data := make([]byte, 2)
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binary.BigEndian.PutUint16(data, uint16(a.args[0]))
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s.AddLog(&vm.Log{Address: addr, Data: data})
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},
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args: make([]int64, 1),
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},
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}
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action := actions[r.Intn(len(actions))]
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var nameargs []string
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if !action.noAddr {
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nameargs = append(nameargs, addr.Hex())
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}
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for _, i := range action.args {
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action.args[i] = rand.Int63n(100)
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nameargs = append(nameargs, fmt.Sprint(action.args[i]))
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}
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action.name += strings.Join(nameargs, ", ")
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return action
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}
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// Generate returns a new snapshot test of the given size. All randomness is
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// derived from r.
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func (*snapshotTest) Generate(r *rand.Rand, size int) reflect.Value {
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// Generate random actions.
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addrs := make([]common.Address, 50)
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for i := range addrs {
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addrs[i][0] = byte(i)
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}
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actions := make([]testAction, size)
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for i := range actions {
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addr := addrs[r.Intn(len(addrs))]
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actions[i] = newTestAction(addr, r)
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}
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// Generate snapshot indexes.
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nsnapshots := int(math.Sqrt(float64(size)))
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if size > 0 && nsnapshots == 0 {
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nsnapshots = 1
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}
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snapshots := make([]int, nsnapshots)
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snaplen := len(actions) / nsnapshots
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for i := range snapshots {
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// Try to place the snapshots some number of actions apart from each other.
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snapshots[i] = (i * snaplen) + r.Intn(snaplen)
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}
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return reflect.ValueOf(&snapshotTest{addrs, actions, snapshots, nil})
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}
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func (test *snapshotTest) String() string {
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out := new(bytes.Buffer)
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sindex := 0
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for i, action := range test.actions {
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if len(test.snapshots) > sindex && i == test.snapshots[sindex] {
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fmt.Fprintf(out, "---- snapshot %d ----\n", sindex)
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sindex++
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}
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fmt.Fprintf(out, "%4d: %s\n", i, action.name)
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}
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return out.String()
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}
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func (test *snapshotTest) run() bool {
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// Run all actions and create snapshots.
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var (
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db, _ = ethdb.NewMemDatabase()
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state, _ = New(common.Hash{}, db)
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snapshotRevs = make([]int, len(test.snapshots))
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sindex = 0
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)
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for i, action := range test.actions {
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if len(test.snapshots) > sindex && i == test.snapshots[sindex] {
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snapshotRevs[sindex] = state.Snapshot()
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sindex++
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}
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action.fn(action, state)
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}
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// Revert all snapshots in reverse order. Each revert must yield a state
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// that is equivalent to fresh state with all actions up the snapshot applied.
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for sindex--; sindex >= 0; sindex-- {
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checkstate, _ := New(common.Hash{}, db)
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for _, action := range test.actions[:test.snapshots[sindex]] {
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action.fn(action, checkstate)
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}
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state.RevertToSnapshot(snapshotRevs[sindex])
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if err := test.checkEqual(state, checkstate); err != nil {
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test.err = fmt.Errorf("state mismatch after revert to snapshot %d\n%v", sindex, err)
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return false
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}
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}
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return true
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}
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// checkEqual checks that methods of state and checkstate return the same values.
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func (test *snapshotTest) checkEqual(state, checkstate *StateDB) error {
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for _, addr := range test.addrs {
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var err error
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checkeq := func(op string, a, b interface{}) bool {
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if err == nil && !reflect.DeepEqual(a, b) {
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err = fmt.Errorf("got %s(%s) == %v, want %v", op, addr.Hex(), a, b)
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return false
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}
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return true
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}
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// Check basic accessor methods.
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checkeq("Exist", state.Exist(addr), checkstate.Exist(addr))
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checkeq("HasSuicided", state.HasSuicided(addr), checkstate.HasSuicided(addr))
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checkeq("GetBalance", state.GetBalance(addr), checkstate.GetBalance(addr))
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checkeq("GetNonce", state.GetNonce(addr), checkstate.GetNonce(addr))
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checkeq("GetCode", state.GetCode(addr), checkstate.GetCode(addr))
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checkeq("GetCodeHash", state.GetCodeHash(addr), checkstate.GetCodeHash(addr))
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checkeq("GetCodeSize", state.GetCodeSize(addr), checkstate.GetCodeSize(addr))
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// Check storage.
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if obj := state.GetStateObject(addr); obj != nil {
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obj.ForEachStorage(func(key, val common.Hash) bool {
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return checkeq("GetState("+key.Hex()+")", val, checkstate.GetState(addr, key))
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})
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checkobj := checkstate.GetStateObject(addr)
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checkobj.ForEachStorage(func(key, checkval common.Hash) bool {
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return checkeq("GetState("+key.Hex()+")", state.GetState(addr, key), checkval)
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})
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}
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if err != nil {
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return err
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}
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}
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if state.GetRefund().Cmp(checkstate.GetRefund()) != 0 {
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return fmt.Errorf("got GetRefund() == %d, want GetRefund() == %d",
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state.GetRefund(), checkstate.GetRefund())
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}
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if !reflect.DeepEqual(state.GetLogs(common.Hash{}), checkstate.GetLogs(common.Hash{})) {
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return fmt.Errorf("got GetLogs(common.Hash{}) == %v, want GetLogs(common.Hash{}) == %v",
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state.GetLogs(common.Hash{}), checkstate.GetLogs(common.Hash{}))
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}
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return nil
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}
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