Official Go implementation of the Ethereum protocol
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go-ethereum/trie/iterator_test.go

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// Copyright 2014 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 trie
import (
"bytes"
"fmt"
"math/rand"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/trie/trienode"
)
func TestEmptyIterator(t *testing.T) {
trie := NewEmpty(newTestDatabase(rawdb.NewMemoryDatabase(), rawdb.HashScheme))
iter := trie.MustNodeIterator(nil)
seen := make(map[string]struct{})
for iter.Next(true) {
seen[string(iter.Path())] = struct{}{}
}
if len(seen) != 0 {
t.Fatal("Unexpected trie node iterated")
}
}
func TestIterator(t *testing.T) {
db := newTestDatabase(rawdb.NewMemoryDatabase(), rawdb.HashScheme)
trie := NewEmpty(db)
vals := []struct{ k, v string }{
{"do", "verb"},
{"ether", "wookiedoo"},
{"horse", "stallion"},
{"shaman", "horse"},
{"doge", "coin"},
{"dog", "puppy"},
{"somethingveryoddindeedthis is", "myothernodedata"},
}
all := make(map[string]string)
for _, val := range vals {
all[val.k] = val.v
trie.MustUpdate([]byte(val.k), []byte(val.v))
}
root, nodes := trie.Commit(false)
db.Update(root, types.EmptyRootHash, trienode.NewWithNodeSet(nodes))
trie, _ = New(TrieID(root), db)
found := make(map[string]string)
it := NewIterator(trie.MustNodeIterator(nil))
for it.Next() {
found[string(it.Key)] = string(it.Value)
}
for k, v := range all {
if found[k] != v {
t.Errorf("iterator value mismatch for %s: got %q want %q", k, found[k], v)
}
}
}
type kv struct {
k, v []byte
t bool
}
func (k *kv) cmp(other *kv) int {
return bytes.Compare(k.k, other.k)
}
func TestIteratorLargeData(t *testing.T) {
trie := NewEmpty(newTestDatabase(rawdb.NewMemoryDatabase(), rawdb.HashScheme))
vals := make(map[string]*kv)
for i := byte(0); i < 255; i++ {
value := &kv{common.LeftPadBytes([]byte{i}, 32), []byte{i}, false}
value2 := &kv{common.LeftPadBytes([]byte{10, i}, 32), []byte{i}, false}
trie.MustUpdate(value.k, value.v)
trie.MustUpdate(value2.k, value2.v)
vals[string(value.k)] = value
vals[string(value2.k)] = value2
}
it := NewIterator(trie.MustNodeIterator(nil))
for it.Next() {
vals[string(it.Key)].t = true
}
var untouched []*kv
for _, value := range vals {
if !value.t {
untouched = append(untouched, value)
}
}
if len(untouched) > 0 {
t.Errorf("Missed %d nodes", len(untouched))
for _, value := range untouched {
t.Error(value)
}
}
}
type iterationElement struct {
hash common.Hash
path []byte
blob []byte
}
// Tests that the node iterator indeed walks over the entire database contents.
func TestNodeIteratorCoverage(t *testing.T) {
testNodeIteratorCoverage(t, rawdb.HashScheme)
testNodeIteratorCoverage(t, rawdb.PathScheme)
}
func testNodeIteratorCoverage(t *testing.T, scheme string) {
// Create some arbitrary test trie to iterate
db, nodeDb, trie, _ := makeTestTrie(scheme)
// Gather all the node hashes found by the iterator
var elements = make(map[common.Hash]iterationElement)
for it := trie.MustNodeIterator(nil); it.Next(true); {
if it.Hash() != (common.Hash{}) {
elements[it.Hash()] = iterationElement{
hash: it.Hash(),
path: common.CopyBytes(it.Path()),
blob: common.CopyBytes(it.NodeBlob()),
}
}
}
// Cross check the hashes and the database itself
reader, err := nodeDb.NodeReader(trie.Hash())
if err != nil {
t.Fatalf("state is not available %x", trie.Hash())
}
for _, element := range elements {
if blob, err := reader.Node(common.Hash{}, element.path, element.hash); err != nil {
t.Errorf("failed to retrieve reported node %x: %v", element.hash, err)
} else if !bytes.Equal(blob, element.blob) {
t.Errorf("node blob is different, want %v got %v", element.blob, blob)
}
}
var (
count int
it = db.NewIterator(nil, nil)
)
for it.Next() {
res, _, _ := isTrieNode(nodeDb.Scheme(), it.Key(), it.Value())
if !res {
continue
}
count += 1
if elem, ok := elements[crypto.Keccak256Hash(it.Value())]; !ok {
t.Error("state entry not reported")
} else if !bytes.Equal(it.Value(), elem.blob) {
t.Errorf("node blob is different, want %v got %v", elem.blob, it.Value())
}
}
it.Release()
if count != len(elements) {
t.Errorf("state entry is mismatched %d %d", count, len(elements))
}
}
type kvs struct{ k, v string }
var testdata1 = []kvs{
{"bar", "b"},
{"barb", "ba"},
{"bard", "bc"},
{"bars", "bb"},
{"fab", "z"},
{"foo", "a"},
{"food", "ab"},
{"foos", "aa"},
}
var testdata2 = []kvs{
{"aardvark", "c"},
{"bar", "b"},
{"barb", "bd"},
{"bars", "be"},
{"fab", "z"},
{"foo", "a"},
{"foos", "aa"},
{"food", "ab"},
{"jars", "d"},
}
func TestIteratorSeek(t *testing.T) {
trie := NewEmpty(newTestDatabase(rawdb.NewMemoryDatabase(), rawdb.HashScheme))
for _, val := range testdata1 {
trie.MustUpdate([]byte(val.k), []byte(val.v))
}
// Seek to the middle.
it := NewIterator(trie.MustNodeIterator([]byte("fab")))
if err := checkIteratorOrder(testdata1[4:], it); err != nil {
t.Fatal(err)
}
// Seek to a non-existent key.
it = NewIterator(trie.MustNodeIterator([]byte("barc")))
if err := checkIteratorOrder(testdata1[2:], it); err != nil {
t.Fatal(err)
}
// Seek beyond the end.
it = NewIterator(trie.MustNodeIterator([]byte("z")))
if err := checkIteratorOrder(nil, it); err != nil {
t.Fatal(err)
}
// Seek to a key for which a prefixing key exists.
it = NewIterator(trie.MustNodeIterator([]byte("food")))
if err := checkIteratorOrder(testdata1[6:], it); err != nil {
t.Fatal(err)
}
}
func checkIteratorOrder(want []kvs, it *Iterator) error {
for it.Next() {
if len(want) == 0 {
return fmt.Errorf("didn't expect any more values, got key %q", it.Key)
}
if !bytes.Equal(it.Key, []byte(want[0].k)) {
return fmt.Errorf("wrong key: got %q, want %q", it.Key, want[0].k)
}
want = want[1:]
}
if len(want) > 0 {
return fmt.Errorf("iterator ended early, want key %q", want[0])
}
return nil
}
func TestDifferenceIterator(t *testing.T) {
dba := newTestDatabase(rawdb.NewMemoryDatabase(), rawdb.HashScheme)
triea := NewEmpty(dba)
for _, val := range testdata1 {
triea.MustUpdate([]byte(val.k), []byte(val.v))
}
rootA, nodesA := triea.Commit(false)
dba.Update(rootA, types.EmptyRootHash, trienode.NewWithNodeSet(nodesA))
triea, _ = New(TrieID(rootA), dba)
dbb := newTestDatabase(rawdb.NewMemoryDatabase(), rawdb.HashScheme)
trieb := NewEmpty(dbb)
for _, val := range testdata2 {
trieb.MustUpdate([]byte(val.k), []byte(val.v))
}
rootB, nodesB := trieb.Commit(false)
dbb.Update(rootB, types.EmptyRootHash, trienode.NewWithNodeSet(nodesB))
trieb, _ = New(TrieID(rootB), dbb)
found := make(map[string]string)
di, _ := NewDifferenceIterator(triea.MustNodeIterator(nil), trieb.MustNodeIterator(nil))
it := NewIterator(di)
for it.Next() {
found[string(it.Key)] = string(it.Value)
}
all := []struct{ k, v string }{
{"aardvark", "c"},
{"barb", "bd"},
{"bars", "be"},
{"jars", "d"},
}
for _, item := range all {
if found[item.k] != item.v {
t.Errorf("iterator value mismatch for %s: got %v want %v", item.k, found[item.k], item.v)
}
}
if len(found) != len(all) {
t.Errorf("iterator count mismatch: got %d values, want %d", len(found), len(all))
}
}
func TestUnionIterator(t *testing.T) {
dba := newTestDatabase(rawdb.NewMemoryDatabase(), rawdb.HashScheme)
triea := NewEmpty(dba)
for _, val := range testdata1 {
triea.MustUpdate([]byte(val.k), []byte(val.v))
}
rootA, nodesA := triea.Commit(false)
dba.Update(rootA, types.EmptyRootHash, trienode.NewWithNodeSet(nodesA))
triea, _ = New(TrieID(rootA), dba)
dbb := newTestDatabase(rawdb.NewMemoryDatabase(), rawdb.HashScheme)
trieb := NewEmpty(dbb)
for _, val := range testdata2 {
trieb.MustUpdate([]byte(val.k), []byte(val.v))
}
rootB, nodesB := trieb.Commit(false)
dbb.Update(rootB, types.EmptyRootHash, trienode.NewWithNodeSet(nodesB))
trieb, _ = New(TrieID(rootB), dbb)
di, _ := NewUnionIterator([]NodeIterator{triea.MustNodeIterator(nil), trieb.MustNodeIterator(nil)})
it := NewIterator(di)
all := []struct{ k, v string }{
{"aardvark", "c"},
{"bar", "b"},
{"barb", "ba"},
{"barb", "bd"},
{"bard", "bc"},
{"bars", "bb"},
{"bars", "be"},
{"fab", "z"},
{"foo", "a"},
{"food", "ab"},
{"foos", "aa"},
{"jars", "d"},
}
for i, kv := range all {
if !it.Next() {
t.Errorf("Iterator ends prematurely at element %d", i)
}
if kv.k != string(it.Key) {
t.Errorf("iterator value mismatch for element %d: got key %s want %s", i, it.Key, kv.k)
}
if kv.v != string(it.Value) {
t.Errorf("iterator value mismatch for element %d: got value %s want %s", i, it.Value, kv.v)
}
}
if it.Next() {
t.Errorf("Iterator returned extra values.")
}
}
func TestIteratorNoDups(t *testing.T) {
db := newTestDatabase(rawdb.NewMemoryDatabase(), rawdb.HashScheme)
tr := NewEmpty(db)
for _, val := range testdata1 {
tr.MustUpdate([]byte(val.k), []byte(val.v))
}
checkIteratorNoDups(t, tr.MustNodeIterator(nil), nil)
}
// This test checks that nodeIterator.Next can be retried after inserting missing trie nodes.
func TestIteratorContinueAfterError(t *testing.T) {
testIteratorContinueAfterError(t, false, rawdb.HashScheme)
testIteratorContinueAfterError(t, true, rawdb.HashScheme)
testIteratorContinueAfterError(t, false, rawdb.PathScheme)
testIteratorContinueAfterError(t, true, rawdb.PathScheme)
}
func testIteratorContinueAfterError(t *testing.T, memonly bool, scheme string) {
diskdb := rawdb.NewMemoryDatabase()
tdb := newTestDatabase(diskdb, scheme)
tr := NewEmpty(tdb)
for _, val := range testdata1 {
tr.MustUpdate([]byte(val.k), []byte(val.v))
}
root, nodes := tr.Commit(false)
tdb.Update(root, types.EmptyRootHash, trienode.NewWithNodeSet(nodes))
if !memonly {
tdb.Commit(root)
}
tr, _ = New(TrieID(root), tdb)
wantNodeCount := checkIteratorNoDups(t, tr.MustNodeIterator(nil), nil)
var (
paths [][]byte
hashes []common.Hash
)
if memonly {
for path, n := range nodes.Nodes {
paths = append(paths, []byte(path))
hashes = append(hashes, n.Hash)
}
} else {
it := diskdb.NewIterator(nil, nil)
for it.Next() {
ok, path, hash := isTrieNode(tdb.Scheme(), it.Key(), it.Value())
if !ok {
continue
}
paths = append(paths, path)
hashes = append(hashes, hash)
}
it.Release()
}
for i := 0; i < 20; i++ {
// Create trie that will load all nodes from DB.
tr, _ := New(TrieID(tr.Hash()), tdb)
// Remove a random node from the database. It can't be the root node
// because that one is already loaded.
var (
rval []byte
rpath []byte
rhash common.Hash
)
for {
if memonly {
rpath = paths[rand.Intn(len(paths))]
n := nodes.Nodes[string(rpath)]
if n == nil {
continue
}
rhash = n.Hash
} else {
index := rand.Intn(len(paths))
rpath = paths[index]
rhash = hashes[index]
}
if rhash != tr.Hash() {
break
}
}
if memonly {
tr.reader.banned = map[string]struct{}{string(rpath): {}}
} else {
rval = rawdb.ReadTrieNode(diskdb, common.Hash{}, rpath, rhash, tdb.Scheme())
rawdb.DeleteTrieNode(diskdb, common.Hash{}, rpath, rhash, tdb.Scheme())
}
// Iterate until the error is hit.
seen := make(map[string]bool)
it := tr.MustNodeIterator(nil)
checkIteratorNoDups(t, it, seen)
missing, ok := it.Error().(*MissingNodeError)
if !ok || missing.NodeHash != rhash {
t.Fatal("didn't hit missing node, got", it.Error())
}
// Add the node back and continue iteration.
if memonly {
delete(tr.reader.banned, string(rpath))
} else {
rawdb.WriteTrieNode(diskdb, common.Hash{}, rpath, rhash, rval, tdb.Scheme())
}
checkIteratorNoDups(t, it, seen)
if it.Error() != nil {
t.Fatal("unexpected error", it.Error())
}
if len(seen) != wantNodeCount {
t.Fatal("wrong node iteration count, got", len(seen), "want", wantNodeCount)
}
}
}
// Similar to the test above, this one checks that failure to create nodeIterator at a
// certain key prefix behaves correctly when Next is called. The expectation is that Next
// should retry seeking before returning true for the first time.
func TestIteratorContinueAfterSeekError(t *testing.T) {
testIteratorContinueAfterSeekError(t, false, rawdb.HashScheme)
testIteratorContinueAfterSeekError(t, true, rawdb.HashScheme)
testIteratorContinueAfterSeekError(t, false, rawdb.PathScheme)
testIteratorContinueAfterSeekError(t, true, rawdb.PathScheme)
}
func testIteratorContinueAfterSeekError(t *testing.T, memonly bool, scheme string) {
// Commit test trie to db, then remove the node containing "bars".
var (
barNodePath []byte
barNodeHash = common.HexToHash("05041990364eb72fcb1127652ce40d8bab765f2bfe53225b1170d276cc101c2e")
)
diskdb := rawdb.NewMemoryDatabase()
triedb := newTestDatabase(diskdb, scheme)
ctr := NewEmpty(triedb)
for _, val := range testdata1 {
ctr.MustUpdate([]byte(val.k), []byte(val.v))
}
root, nodes := ctr.Commit(false)
for path, n := range nodes.Nodes {
if n.Hash == barNodeHash {
barNodePath = []byte(path)
break
}
}
triedb.Update(root, types.EmptyRootHash, trienode.NewWithNodeSet(nodes))
if !memonly {
triedb.Commit(root)
}
var (
barNodeBlob []byte
)
tr, _ := New(TrieID(root), triedb)
if memonly {
tr.reader.banned = map[string]struct{}{string(barNodePath): {}}
} else {
barNodeBlob = rawdb.ReadTrieNode(diskdb, common.Hash{}, barNodePath, barNodeHash, triedb.Scheme())
rawdb.DeleteTrieNode(diskdb, common.Hash{}, barNodePath, barNodeHash, triedb.Scheme())
}
// Create a new iterator that seeks to "bars". Seeking can't proceed because
// the node is missing.
it := tr.MustNodeIterator([]byte("bars"))
missing, ok := it.Error().(*MissingNodeError)
if !ok {
t.Fatal("want MissingNodeError, got", it.Error())
} else if missing.NodeHash != barNodeHash {
t.Fatal("wrong node missing")
}
// Reinsert the missing node.
if memonly {
delete(tr.reader.banned, string(barNodePath))
} else {
rawdb.WriteTrieNode(diskdb, common.Hash{}, barNodePath, barNodeHash, barNodeBlob, triedb.Scheme())
}
// Check that iteration produces the right set of values.
if err := checkIteratorOrder(testdata1[3:], NewIterator(it)); err != nil {
t.Fatal(err)
}
}
func checkIteratorNoDups(t *testing.T, it NodeIterator, seen map[string]bool) int {
if seen == nil {
seen = make(map[string]bool)
}
for it.Next(true) {
if seen[string(it.Path())] {
t.Fatalf("iterator visited node path %x twice", it.Path())
}
seen[string(it.Path())] = true
}
return len(seen)
}
func TestIteratorNodeBlob(t *testing.T) {
testIteratorNodeBlob(t, rawdb.HashScheme)
testIteratorNodeBlob(t, rawdb.PathScheme)
}
func testIteratorNodeBlob(t *testing.T, scheme string) {
var (
db = rawdb.NewMemoryDatabase()
triedb = newTestDatabase(db, scheme)
trie = NewEmpty(triedb)
)
vals := []struct{ k, v string }{
{"do", "verb"},
{"ether", "wookiedoo"},
{"horse", "stallion"},
{"shaman", "horse"},
{"doge", "coin"},
{"dog", "puppy"},
{"somethingveryoddindeedthis is", "myothernodedata"},
}
all := make(map[string]string)
for _, val := range vals {
all[val.k] = val.v
trie.MustUpdate([]byte(val.k), []byte(val.v))
}
root, nodes := trie.Commit(false)
triedb.Update(root, types.EmptyRootHash, trienode.NewWithNodeSet(nodes))
triedb.Commit(root)
var found = make(map[common.Hash][]byte)
trie, _ = New(TrieID(root), triedb)
it := trie.MustNodeIterator(nil)
for it.Next(true) {
if it.Hash() == (common.Hash{}) {
continue
}
found[it.Hash()] = it.NodeBlob()
}
dbIter := db.NewIterator(nil, nil)
defer dbIter.Release()
var count int
for dbIter.Next() {
ok, _, _ := isTrieNode(triedb.Scheme(), dbIter.Key(), dbIter.Value())
if !ok {
continue
}
got, present := found[crypto.Keccak256Hash(dbIter.Value())]
if !present {
t.Fatal("Miss trie node")
}
if !bytes.Equal(got, dbIter.Value()) {
t.Fatalf("Unexpected trie node want %v got %v", dbIter.Value(), got)
}
count += 1
}
if count != len(found) {
t.Fatal("Find extra trie node via iterator")
}
}
// isTrieNode is a helper function which reports if the provided
// database entry belongs to a trie node or not. Note in tests
// only single layer trie is used, namely storage trie is not
// considered at all.
func isTrieNode(scheme string, key, val []byte) (bool, []byte, common.Hash) {
var (
path []byte
hash common.Hash
)
if scheme == rawdb.HashScheme {
ok := rawdb.IsLegacyTrieNode(key, val)
if !ok {
return false, nil, common.Hash{}
}
hash = common.BytesToHash(key)
} else {
ok, remain := rawdb.ResolveAccountTrieNodeKey(key)
if !ok {
return false, nil, common.Hash{}
}
path = common.CopyBytes(remain)
hash = crypto.Keccak256Hash(val)
}
return true, path, hash
}
func BenchmarkIterator(b *testing.B) {
diskDb, srcDb, tr, _ := makeTestTrie(rawdb.HashScheme)
root := tr.Hash()
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
if err := checkTrieConsistency(diskDb, srcDb.Scheme(), root, false); err != nil {
b.Fatal(err)
}
}
}