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vendor/github.com/syndtr/goleveldb/leveldb/testutil/db.go

@@ -0,0 +1,222 @@
+// Copyright (c) 2014, Suryandaru Triandana <syndtr@gmail.com>
+// All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package testutil
+
+import (
+	"fmt"
+	"math/rand"
+
+	. "github.com/onsi/gomega"
+
+	"github.com/syndtr/goleveldb/leveldb/errors"
+	"github.com/syndtr/goleveldb/leveldb/iterator"
+	"github.com/syndtr/goleveldb/leveldb/util"
+)
+
+type DB interface{}
+
+type Put interface {
+	TestPut(key []byte, value []byte) error
+}
+
+type Delete interface {
+	TestDelete(key []byte) error
+}
+
+type Find interface {
+	TestFind(key []byte) (rkey, rvalue []byte, err error)
+}
+
+type Get interface {
+	TestGet(key []byte) (value []byte, err error)
+}
+
+type Has interface {
+	TestHas(key []byte) (ret bool, err error)
+}
+
+type NewIterator interface {
+	TestNewIterator(slice *util.Range) iterator.Iterator
+}
+
+type DBAct int
+
+func (a DBAct) String() string {
+	switch a {
+	case DBNone:
+		return "none"
+	case DBPut:
+		return "put"
+	case DBOverwrite:
+		return "overwrite"
+	case DBDelete:
+		return "delete"
+	case DBDeleteNA:
+		return "delete_na"
+	}
+	return "unknown"
+}
+
+const (
+	DBNone DBAct = iota
+	DBPut
+	DBOverwrite
+	DBDelete
+	DBDeleteNA
+)
+
+type DBTesting struct {
+	Rand *rand.Rand
+	DB   interface {
+		Get
+		Put
+		Delete
+	}
+	PostFn             func(t *DBTesting)
+	Deleted, Present   KeyValue
+	Act, LastAct       DBAct
+	ActKey, LastActKey []byte
+}
+
+func (t *DBTesting) post() {
+	if t.PostFn != nil {
+		t.PostFn(t)
+	}
+}
+
+func (t *DBTesting) setAct(act DBAct, key []byte) {
+	t.LastAct, t.Act = t.Act, act
+	t.LastActKey, t.ActKey = t.ActKey, key
+}
+
+func (t *DBTesting) text() string {
+	return fmt.Sprintf("last action was <%v> %q, <%v> %q", t.LastAct, t.LastActKey, t.Act, t.ActKey)
+}
+
+func (t *DBTesting) Text() string {
+	return "DBTesting " + t.text()
+}
+
+func (t *DBTesting) TestPresentKV(key, value []byte) {
+	rvalue, err := t.DB.TestGet(key)
+	Expect(err).ShouldNot(HaveOccurred(), "Get on key %q, %s", key, t.text())
+	Expect(rvalue).Should(Equal(value), "Value for key %q, %s", key, t.text())
+}
+
+func (t *DBTesting) TestAllPresent() {
+	t.Present.IterateShuffled(t.Rand, func(i int, key, value []byte) {
+		t.TestPresentKV(key, value)
+	})
+}
+
+func (t *DBTesting) TestDeletedKey(key []byte) {
+	_, err := t.DB.TestGet(key)
+	Expect(err).Should(Equal(errors.ErrNotFound), "Get on deleted key %q, %s", key, t.text())
+}
+
+func (t *DBTesting) TestAllDeleted() {
+	t.Deleted.IterateShuffled(t.Rand, func(i int, key, value []byte) {
+		t.TestDeletedKey(key)
+	})
+}
+
+func (t *DBTesting) TestAll() {
+	dn := t.Deleted.Len()
+	pn := t.Present.Len()
+	ShuffledIndex(t.Rand, dn+pn, 1, func(i int) {
+		if i >= dn {
+			key, value := t.Present.Index(i - dn)
+			t.TestPresentKV(key, value)
+		} else {
+			t.TestDeletedKey(t.Deleted.KeyAt(i))
+		}
+	})
+}
+
+func (t *DBTesting) Put(key, value []byte) {
+	if new := t.Present.PutU(key, value); new {
+		t.setAct(DBPut, key)
+	} else {
+		t.setAct(DBOverwrite, key)
+	}
+	t.Deleted.Delete(key)
+	err := t.DB.TestPut(key, value)
+	Expect(err).ShouldNot(HaveOccurred(), t.Text())
+	t.TestPresentKV(key, value)
+	t.post()
+}
+
+func (t *DBTesting) PutRandom() bool {
+	if t.Deleted.Len() > 0 {
+		i := t.Rand.Intn(t.Deleted.Len())
+		key, value := t.Deleted.Index(i)
+		t.Put(key, value)
+		return true
+	}
+	return false
+}
+
+func (t *DBTesting) Delete(key []byte) {
+	if exist, value := t.Present.Delete(key); exist {
+		t.setAct(DBDelete, key)
+		t.Deleted.PutU(key, value)
+	} else {
+		t.setAct(DBDeleteNA, key)
+	}
+	err := t.DB.TestDelete(key)
+	Expect(err).ShouldNot(HaveOccurred(), t.Text())
+	t.TestDeletedKey(key)
+	t.post()
+}
+
+func (t *DBTesting) DeleteRandom() bool {
+	if t.Present.Len() > 0 {
+		i := t.Rand.Intn(t.Present.Len())
+		t.Delete(t.Present.KeyAt(i))
+		return true
+	}
+	return false
+}
+
+func (t *DBTesting) RandomAct(round int) {
+	for i := 0; i < round; i++ {
+		if t.Rand.Int()%2 == 0 {
+			t.PutRandom()
+		} else {
+			t.DeleteRandom()
+		}
+	}
+}
+
+func DoDBTesting(t *DBTesting) {
+	if t.Rand == nil {
+		t.Rand = NewRand()
+	}
+
+	t.DeleteRandom()
+	t.PutRandom()
+	t.DeleteRandom()
+	t.DeleteRandom()
+	for i := t.Deleted.Len() / 2; i >= 0; i-- {
+		t.PutRandom()
+	}
+	t.RandomAct((t.Deleted.Len() + t.Present.Len()) * 10)
+
+	// Additional iterator testing
+	if db, ok := t.DB.(NewIterator); ok {
+		iter := db.TestNewIterator(nil)
+		Expect(iter.Error()).NotTo(HaveOccurred())
+
+		it := IteratorTesting{
+			KeyValue: t.Present,
+			Iter:     iter,
+		}
+
+		DoIteratorTesting(&it)
+		iter.Release()
+	}
+}

vendor/github.com/syndtr/goleveldb/leveldb/testutil/ginkgo.go

@@ -0,0 +1,21 @@
+package testutil
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+func RunSuite(t GinkgoTestingT, name string) {
+	RunDefer()
+
+	SynchronizedBeforeSuite(func() []byte {
+		RunDefer("setup")
+		return nil
+	}, func(data []byte) {})
+	SynchronizedAfterSuite(func() {
+		RunDefer("teardown")
+	}, func() {})
+
+	RegisterFailHandler(Fail)
+	RunSpecs(t, name)
+}

vendor/github.com/syndtr/goleveldb/leveldb/testutil/iter.go

@@ -0,0 +1,327 @@
+// Copyright (c) 2014, Suryandaru Triandana <syndtr@gmail.com>
+// All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package testutil
+
+import (
+	"fmt"
+	"math/rand"
+
+	. "github.com/onsi/gomega"
+
+	"github.com/syndtr/goleveldb/leveldb/iterator"
+)
+
+type IterAct int
+
+func (a IterAct) String() string {
+	switch a {
+	case IterNone:
+		return "none"
+	case IterFirst:
+		return "first"
+	case IterLast:
+		return "last"
+	case IterPrev:
+		return "prev"
+	case IterNext:
+		return "next"
+	case IterSeek:
+		return "seek"
+	case IterSOI:
+		return "soi"
+	case IterEOI:
+		return "eoi"
+	}
+	return "unknown"
+}
+
+const (
+	IterNone IterAct = iota
+	IterFirst
+	IterLast
+	IterPrev
+	IterNext
+	IterSeek
+	IterSOI
+	IterEOI
+)
+
+type IteratorTesting struct {
+	KeyValue
+	Iter         iterator.Iterator
+	Rand         *rand.Rand
+	PostFn       func(t *IteratorTesting)
+	Pos          int
+	Act, LastAct IterAct
+
+	once bool
+}
+
+func (t *IteratorTesting) init() {
+	if !t.once {
+		t.Pos = -1
+		t.once = true
+	}
+}
+
+func (t *IteratorTesting) post() {
+	if t.PostFn != nil {
+		t.PostFn(t)
+	}
+}
+
+func (t *IteratorTesting) setAct(act IterAct) {
+	t.LastAct, t.Act = t.Act, act
+}
+
+func (t *IteratorTesting) text() string {
+	return fmt.Sprintf("at pos %d and last action was <%v> -> <%v>", t.Pos, t.LastAct, t.Act)
+}
+
+func (t *IteratorTesting) Text() string {
+	return "IteratorTesting is " + t.text()
+}
+
+func (t *IteratorTesting) IsFirst() bool {
+	t.init()
+	return t.Len() > 0 && t.Pos == 0
+}
+
+func (t *IteratorTesting) IsLast() bool {
+	t.init()
+	return t.Len() > 0 && t.Pos == t.Len()-1
+}
+
+func (t *IteratorTesting) TestKV() {
+	t.init()
+	key, value := t.Index(t.Pos)
+	Expect(t.Iter.Key()).NotTo(BeNil())
+	Expect(t.Iter.Key()).Should(Equal(key), "Key is invalid, %s", t.text())
+	Expect(t.Iter.Value()).Should(Equal(value), "Value for key %q, %s", key, t.text())
+}
+
+func (t *IteratorTesting) First() {
+	t.init()
+	t.setAct(IterFirst)
+
+	ok := t.Iter.First()
+	Expect(t.Iter.Error()).ShouldNot(HaveOccurred())
+	if t.Len() > 0 {
+		t.Pos = 0
+		Expect(ok).Should(BeTrue(), t.Text())
+		t.TestKV()
+	} else {
+		t.Pos = -1
+		Expect(ok).ShouldNot(BeTrue(), t.Text())
+	}
+	t.post()
+}
+
+func (t *IteratorTesting) Last() {
+	t.init()
+	t.setAct(IterLast)
+
+	ok := t.Iter.Last()
+	Expect(t.Iter.Error()).ShouldNot(HaveOccurred())
+	if t.Len() > 0 {
+		t.Pos = t.Len() - 1
+		Expect(ok).Should(BeTrue(), t.Text())
+		t.TestKV()
+	} else {
+		t.Pos = 0
+		Expect(ok).ShouldNot(BeTrue(), t.Text())
+	}
+	t.post()
+}
+
+func (t *IteratorTesting) Next() {
+	t.init()
+	t.setAct(IterNext)
+
+	ok := t.Iter.Next()
+	Expect(t.Iter.Error()).ShouldNot(HaveOccurred())
+	if t.Pos < t.Len()-1 {
+		t.Pos++
+		Expect(ok).Should(BeTrue(), t.Text())
+		t.TestKV()
+	} else {
+		t.Pos = t.Len()
+		Expect(ok).ShouldNot(BeTrue(), t.Text())
+	}
+	t.post()
+}
+
+func (t *IteratorTesting) Prev() {
+	t.init()
+	t.setAct(IterPrev)
+
+	ok := t.Iter.Prev()
+	Expect(t.Iter.Error()).ShouldNot(HaveOccurred())
+	if t.Pos > 0 {
+		t.Pos--
+		Expect(ok).Should(BeTrue(), t.Text())
+		t.TestKV()
+	} else {
+		t.Pos = -1
+		Expect(ok).ShouldNot(BeTrue(), t.Text())
+	}
+	t.post()
+}
+
+func (t *IteratorTesting) Seek(i int) {
+	t.init()
+	t.setAct(IterSeek)
+
+	key, _ := t.Index(i)
+	oldKey, _ := t.IndexOrNil(t.Pos)
+
+	ok := t.Iter.Seek(key)
+	Expect(t.Iter.Error()).ShouldNot(HaveOccurred())
+	Expect(ok).Should(BeTrue(), fmt.Sprintf("Seek from key %q to %q, to pos %d, %s", oldKey, key, i, t.text()))
+
+	t.Pos = i
+	t.TestKV()
+	t.post()
+}
+
+func (t *IteratorTesting) SeekInexact(i int) {
+	t.init()
+	t.setAct(IterSeek)
+	var key0 []byte
+	key1, _ := t.Index(i)
+	if i > 0 {
+		key0, _ = t.Index(i - 1)
+	}
+	key := BytesSeparator(key0, key1)
+	oldKey, _ := t.IndexOrNil(t.Pos)
+
+	ok := t.Iter.Seek(key)
+	Expect(t.Iter.Error()).ShouldNot(HaveOccurred())
+	Expect(ok).Should(BeTrue(), fmt.Sprintf("Seek from key %q to %q (%q), to pos %d, %s", oldKey, key, key1, i, t.text()))
+
+	t.Pos = i
+	t.TestKV()
+	t.post()
+}
+
+func (t *IteratorTesting) SeekKey(key []byte) {
+	t.init()
+	t.setAct(IterSeek)
+	oldKey, _ := t.IndexOrNil(t.Pos)
+	i := t.Search(key)
+
+	ok := t.Iter.Seek(key)
+	Expect(t.Iter.Error()).ShouldNot(HaveOccurred())
+	if i < t.Len() {
+		key_, _ := t.Index(i)
+		Expect(ok).Should(BeTrue(), fmt.Sprintf("Seek from key %q to %q (%q), to pos %d, %s", oldKey, key, key_, i, t.text()))
+		t.Pos = i
+		t.TestKV()
+	} else {
+		Expect(ok).ShouldNot(BeTrue(), fmt.Sprintf("Seek from key %q to %q, %s", oldKey, key, t.text()))
+	}
+
+	t.Pos = i
+	t.post()
+}
+
+func (t *IteratorTesting) SOI() {
+	t.init()
+	t.setAct(IterSOI)
+	Expect(t.Pos).Should(BeNumerically("<=", 0), t.Text())
+	for i := 0; i < 3; i++ {
+		t.Prev()
+	}
+	t.post()
+}
+
+func (t *IteratorTesting) EOI() {
+	t.init()
+	t.setAct(IterEOI)
+	Expect(t.Pos).Should(BeNumerically(">=", t.Len()-1), t.Text())
+	for i := 0; i < 3; i++ {
+		t.Next()
+	}
+	t.post()
+}
+
+func (t *IteratorTesting) WalkPrev(fn func(t *IteratorTesting)) {
+	t.init()
+	for old := t.Pos; t.Pos > 0; old = t.Pos {
+		fn(t)
+		Expect(t.Pos).Should(BeNumerically("<", old), t.Text())
+	}
+}
+
+func (t *IteratorTesting) WalkNext(fn func(t *IteratorTesting)) {
+	t.init()
+	for old := t.Pos; t.Pos < t.Len()-1; old = t.Pos {
+		fn(t)
+		Expect(t.Pos).Should(BeNumerically(">", old), t.Text())
+	}
+}
+
+func (t *IteratorTesting) PrevAll() {
+	t.WalkPrev(func(t *IteratorTesting) {
+		t.Prev()
+	})
+}
+
+func (t *IteratorTesting) NextAll() {
+	t.WalkNext(func(t *IteratorTesting) {
+		t.Next()
+	})
+}
+
+func DoIteratorTesting(t *IteratorTesting) {
+	if t.Rand == nil {
+		t.Rand = NewRand()
+	}
+	t.SOI()
+	t.NextAll()
+	t.First()
+	t.SOI()
+	t.NextAll()
+	t.EOI()
+	t.PrevAll()
+	t.Last()
+	t.EOI()
+	t.PrevAll()
+	t.SOI()
+
+	t.NextAll()
+	t.PrevAll()
+	t.NextAll()
+	t.Last()
+	t.PrevAll()
+	t.First()
+	t.NextAll()
+	t.EOI()
+
+	ShuffledIndex(t.Rand, t.Len(), 1, func(i int) {
+		t.Seek(i)
+	})
+
+	ShuffledIndex(t.Rand, t.Len(), 1, func(i int) {
+		t.SeekInexact(i)
+	})
+
+	ShuffledIndex(t.Rand, t.Len(), 1, func(i int) {
+		t.Seek(i)
+		if i%2 != 0 {
+			t.PrevAll()
+			t.SOI()
+		} else {
+			t.NextAll()
+			t.EOI()
+		}
+	})
+
+	for _, key := range []string{"", "foo", "bar", "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"} {
+		t.SeekKey([]byte(key))
+	}
+}

vendor/github.com/syndtr/goleveldb/leveldb/testutil/kv.go

@@ -0,0 +1,352 @@
+// Copyright (c) 2014, Suryandaru Triandana <syndtr@gmail.com>
+// All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package testutil
+
+import (
+	"fmt"
+	"math/rand"
+	"sort"
+	"strings"
+
+	"github.com/syndtr/goleveldb/leveldb/util"
+)
+
+type KeyValueEntry struct {
+	key, value []byte
+}
+
+type KeyValue struct {
+	entries []KeyValueEntry
+	nbytes  int
+}
+
+func (kv *KeyValue) Put(key, value []byte) {
+	if n := len(kv.entries); n > 0 && cmp.Compare(kv.entries[n-1].key, key) >= 0 {
+		panic(fmt.Sprintf("Put: keys are not in increasing order: %q, %q", kv.entries[n-1].key, key))
+	}
+	kv.entries = append(kv.entries, KeyValueEntry{key, value})
+	kv.nbytes += len(key) + len(value)
+}
+
+func (kv *KeyValue) PutString(key, value string) {
+	kv.Put([]byte(key), []byte(value))
+}
+
+func (kv *KeyValue) PutU(key, value []byte) bool {
+	if i, exist := kv.Get(key); !exist {
+		if i < kv.Len() {
+			kv.entries = append(kv.entries[:i+1], kv.entries[i:]...)
+			kv.entries[i] = KeyValueEntry{key, value}
+		} else {
+			kv.entries = append(kv.entries, KeyValueEntry{key, value})
+		}
+		kv.nbytes += len(key) + len(value)
+		return true
+	} else {
+		kv.nbytes += len(value) - len(kv.ValueAt(i))
+		kv.entries[i].value = value
+	}
+	return false
+}
+
+func (kv *KeyValue) PutUString(key, value string) bool {
+	return kv.PutU([]byte(key), []byte(value))
+}
+
+func (kv *KeyValue) Delete(key []byte) (exist bool, value []byte) {
+	i, exist := kv.Get(key)
+	if exist {
+		value = kv.entries[i].value
+		kv.DeleteIndex(i)
+	}
+	return
+}
+
+func (kv *KeyValue) DeleteIndex(i int) bool {
+	if i < kv.Len() {
+		kv.nbytes -= len(kv.KeyAt(i)) + len(kv.ValueAt(i))
+		kv.entries = append(kv.entries[:i], kv.entries[i+1:]...)
+		return true
+	}
+	return false
+}
+
+func (kv KeyValue) Len() int {
+	return len(kv.entries)
+}
+
+func (kv *KeyValue) Size() int {
+	return kv.nbytes
+}
+
+func (kv KeyValue) KeyAt(i int) []byte {
+	return kv.entries[i].key
+}
+
+func (kv KeyValue) ValueAt(i int) []byte {
+	return kv.entries[i].value
+}
+
+func (kv KeyValue) Index(i int) (key, value []byte) {
+	if i < 0 || i >= len(kv.entries) {
+		panic(fmt.Sprintf("Index #%d: out of range", i))
+	}
+	return kv.entries[i].key, kv.entries[i].value
+}
+
+func (kv KeyValue) IndexInexact(i int) (key_, key, value []byte) {
+	key, value = kv.Index(i)
+	var key0 []byte
+	var key1 = kv.KeyAt(i)
+	if i > 0 {
+		key0 = kv.KeyAt(i - 1)
+	}
+	key_ = BytesSeparator(key0, key1)
+	return
+}
+
+func (kv KeyValue) IndexOrNil(i int) (key, value []byte) {
+	if i >= 0 && i < len(kv.entries) {
+		return kv.entries[i].key, kv.entries[i].value
+	}
+	return nil, nil
+}
+
+func (kv KeyValue) IndexString(i int) (key, value string) {
+	key_, _value := kv.Index(i)
+	return string(key_), string(_value)
+}
+
+func (kv KeyValue) Search(key []byte) int {
+	return sort.Search(kv.Len(), func(i int) bool {
+		return cmp.Compare(kv.KeyAt(i), key) >= 0
+	})
+}
+
+func (kv KeyValue) SearchString(key string) int {
+	return kv.Search([]byte(key))
+}
+
+func (kv KeyValue) Get(key []byte) (i int, exist bool) {
+	i = kv.Search(key)
+	if i < kv.Len() && cmp.Compare(kv.KeyAt(i), key) == 0 {
+		exist = true
+	}
+	return
+}
+
+func (kv KeyValue) GetString(key string) (i int, exist bool) {
+	return kv.Get([]byte(key))
+}
+
+func (kv KeyValue) Iterate(fn func(i int, key, value []byte)) {
+	for i, x := range kv.entries {
+		fn(i, x.key, x.value)
+	}
+}
+
+func (kv KeyValue) IterateString(fn func(i int, key, value string)) {
+	kv.Iterate(func(i int, key, value []byte) {
+		fn(i, string(key), string(value))
+	})
+}
+
+func (kv KeyValue) IterateShuffled(rnd *rand.Rand, fn func(i int, key, value []byte)) {
+	ShuffledIndex(rnd, kv.Len(), 1, func(i int) {
+		fn(i, kv.entries[i].key, kv.entries[i].value)
+	})
+}
+
+func (kv KeyValue) IterateShuffledString(rnd *rand.Rand, fn func(i int, key, value string)) {
+	kv.IterateShuffled(rnd, func(i int, key, value []byte) {
+		fn(i, string(key), string(value))
+	})
+}
+
+func (kv KeyValue) IterateInexact(fn func(i int, key_, key, value []byte)) {
+	for i := range kv.entries {
+		key_, key, value := kv.IndexInexact(i)
+		fn(i, key_, key, value)
+	}
+}
+
+func (kv KeyValue) IterateInexactString(fn func(i int, key_, key, value string)) {
+	kv.IterateInexact(func(i int, key_, key, value []byte) {
+		fn(i, string(key_), string(key), string(value))
+	})
+}
+
+func (kv KeyValue) Clone() KeyValue {
+	return KeyValue{append([]KeyValueEntry{}, kv.entries...), kv.nbytes}
+}
+
+func (kv KeyValue) Slice(start, limit int) KeyValue {
+	if start < 0 || limit > kv.Len() {
+		panic(fmt.Sprintf("Slice %d .. %d: out of range", start, limit))
+	} else if limit < start {
+		panic(fmt.Sprintf("Slice %d .. %d: invalid range", start, limit))
+	}
+	return KeyValue{append([]KeyValueEntry{}, kv.entries[start:limit]...), kv.nbytes}
+}
+
+func (kv KeyValue) SliceKey(start, limit []byte) KeyValue {
+	start_ := 0
+	limit_ := kv.Len()
+	if start != nil {
+		start_ = kv.Search(start)
+	}
+	if limit != nil {
+		limit_ = kv.Search(limit)
+	}
+	return kv.Slice(start_, limit_)
+}
+
+func (kv KeyValue) SliceKeyString(start, limit string) KeyValue {
+	return kv.SliceKey([]byte(start), []byte(limit))
+}
+
+func (kv KeyValue) SliceRange(r *util.Range) KeyValue {
+	if r != nil {
+		return kv.SliceKey(r.Start, r.Limit)
+	}
+	return kv.Clone()
+}
+
+func (kv KeyValue) Range(start, limit int) (r util.Range) {
+	if kv.Len() > 0 {
+		if start == kv.Len() {
+			r.Start = BytesAfter(kv.KeyAt(start - 1))
+		} else {
+			r.Start = kv.KeyAt(start)
+		}
+	}
+	if limit < kv.Len() {
+		r.Limit = kv.KeyAt(limit)
+	}
+	return
+}
+
+func KeyValue_EmptyKey() *KeyValue {
+	kv := &KeyValue{}
+	kv.PutString("", "v")
+	return kv
+}
+
+func KeyValue_EmptyValue() *KeyValue {
+	kv := &KeyValue{}
+	kv.PutString("abc", "")
+	kv.PutString("abcd", "")
+	return kv
+}
+
+func KeyValue_OneKeyValue() *KeyValue {
+	kv := &KeyValue{}
+	kv.PutString("abc", "v")
+	return kv
+}
+
+func KeyValue_BigValue() *KeyValue {
+	kv := &KeyValue{}
+	kv.PutString("big1", strings.Repeat("1", 200000))
+	return kv
+}
+
+func KeyValue_SpecialKey() *KeyValue {
+	kv := &KeyValue{}
+	kv.PutString("\xff\xff", "v3")
+	return kv
+}
+
+func KeyValue_MultipleKeyValue() *KeyValue {
+	kv := &KeyValue{}
+	kv.PutString("a", "v")
+	kv.PutString("aa", "v1")
+	kv.PutString("aaa", "v2")
+	kv.PutString("aaacccccccccc", "v2")
+	kv.PutString("aaaccccccccccd", "v3")
+	kv.PutString("aaaccccccccccf", "v4")
+	kv.PutString("aaaccccccccccfg", "v5")
+	kv.PutString("ab", "v6")
+	kv.PutString("abc", "v7")
+	kv.PutString("abcd", "v8")
+	kv.PutString("accccccccccccccc", "v9")
+	kv.PutString("b", "v10")
+	kv.PutString("bb", "v11")
+	kv.PutString("bc", "v12")
+	kv.PutString("c", "v13")
+	kv.PutString("c1", "v13")
+	kv.PutString("czzzzzzzzzzzzzz", "v14")
+	kv.PutString("fffffffffffffff", "v15")
+	kv.PutString("g11", "v15")
+	kv.PutString("g111", "v15")
+	kv.PutString("g111\xff", "v15")
+	kv.PutString("zz", "v16")
+	kv.PutString("zzzzzzz", "v16")
+	kv.PutString("zzzzzzzzzzzzzzzz", "v16")
+	return kv
+}
+
+var keymap = []byte("012345678ABCDEFGHIJKLMNOPQRSTUVWXYabcdefghijklmnopqrstuvwxy")
+
+func KeyValue_Generate(rnd *rand.Rand, n, minlen, maxlen, vminlen, vmaxlen int) *KeyValue {
+	if rnd == nil {
+		rnd = NewRand()
+	}
+	if maxlen < minlen {
+		panic("max len should >= min len")
+	}
+
+	rrand := func(min, max int) int {
+		if min == max {
+			return max
+		}
+		return rnd.Intn(max-min) + min
+	}
+
+	kv := &KeyValue{}
+	endC := byte(len(keymap) - 1)
+	gen := make([]byte, 0, maxlen)
+	for i := 0; i < n; i++ {
+		m := rrand(minlen, maxlen)
+		last := gen
+	retry:
+		gen = last[:m]
+		if k := len(last); m > k {
+			for j := k; j < m; j++ {
+				gen[j] = 0
+			}
+		} else {
+			for j := m - 1; j >= 0; j-- {
+				c := last[j]
+				if c == endC {
+					continue
+				}
+				gen[j] = c + 1
+				for j += 1; j < m; j++ {
+					gen[j] = 0
+				}
+				goto ok
+			}
+			if m < maxlen {
+				m++
+				goto retry
+			}
+			panic(fmt.Sprintf("only able to generate %d keys out of %d keys, try increasing max len", kv.Len(), n))
+		ok:
+		}
+		key := make([]byte, m)
+		for j := 0; j < m; j++ {
+			key[j] = keymap[gen[j]]
+		}
+		value := make([]byte, rrand(vminlen, vmaxlen))
+		for n := copy(value, []byte(fmt.Sprintf("v%d", i))); n < len(value); n++ {
+			value[n] = 'x'
+		}
+		kv.Put(key, value)
+	}
+	return kv
+}

vendor/github.com/syndtr/goleveldb/leveldb/testutil/kvtest.go

@@ -0,0 +1,211 @@
+// Copyright (c) 2014, Suryandaru Triandana <syndtr@gmail.com>
+// All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package testutil
+
+import (
+	"fmt"
+	"math/rand"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"github.com/syndtr/goleveldb/leveldb/errors"
+	"github.com/syndtr/goleveldb/leveldb/util"
+)
+
+func TestFind(db Find, kv KeyValue) {
+	ShuffledIndex(nil, kv.Len(), 1, func(i int) {
+		key_, key, value := kv.IndexInexact(i)
+
+		// Using exact key.
+		rkey, rvalue, err := db.TestFind(key)
+		Expect(err).ShouldNot(HaveOccurred(), "Error for key %q", key)
+		Expect(rkey).Should(Equal(key), "Key")
+		Expect(rvalue).Should(Equal(value), "Value for key %q", key)
+
+		// Using inexact key.
+		rkey, rvalue, err = db.TestFind(key_)
+		Expect(err).ShouldNot(HaveOccurred(), "Error for key %q (%q)", key_, key)
+		Expect(rkey).Should(Equal(key))
+		Expect(rvalue).Should(Equal(value), "Value for key %q (%q)", key_, key)
+	})
+}
+
+func TestFindAfterLast(db Find, kv KeyValue) {
+	var key []byte
+	if kv.Len() > 0 {
+		key_, _ := kv.Index(kv.Len() - 1)
+		key = BytesAfter(key_)
+	}
+	rkey, _, err := db.TestFind(key)
+	Expect(err).Should(HaveOccurred(), "Find for key %q yield key %q", key, rkey)
+	Expect(err).Should(Equal(errors.ErrNotFound))
+}
+
+func TestGet(db Get, kv KeyValue) {
+	ShuffledIndex(nil, kv.Len(), 1, func(i int) {
+		key_, key, value := kv.IndexInexact(i)
+
+		// Using exact key.
+		rvalue, err := db.TestGet(key)
+		Expect(err).ShouldNot(HaveOccurred(), "Error for key %q", key)
+		Expect(rvalue).Should(Equal(value), "Value for key %q", key)
+
+		// Using inexact key.
+		if len(key_) > 0 {
+			_, err = db.TestGet(key_)
+			Expect(err).Should(HaveOccurred(), "Error for key %q", key_)
+			Expect(err).Should(Equal(errors.ErrNotFound))
+		}
+	})
+}
+
+func TestHas(db Has, kv KeyValue) {
+	ShuffledIndex(nil, kv.Len(), 1, func(i int) {
+		key_, key, _ := kv.IndexInexact(i)
+
+		// Using exact key.
+		ret, err := db.TestHas(key)
+		Expect(err).ShouldNot(HaveOccurred(), "Error for key %q", key)
+		Expect(ret).Should(BeTrue(), "False for key %q", key)
+
+		// Using inexact key.
+		if len(key_) > 0 {
+			ret, err = db.TestHas(key_)
+			Expect(err).ShouldNot(HaveOccurred(), "Error for key %q", key_)
+			Expect(ret).ShouldNot(BeTrue(), "True for key %q", key)
+		}
+	})
+}
+
+func TestIter(db NewIterator, r *util.Range, kv KeyValue) {
+	iter := db.TestNewIterator(r)
+	Expect(iter.Error()).ShouldNot(HaveOccurred())
+
+	t := IteratorTesting{
+		KeyValue: kv,
+		Iter:     iter,
+	}
+
+	DoIteratorTesting(&t)
+	iter.Release()
+}
+
+func KeyValueTesting(rnd *rand.Rand, kv KeyValue, p DB, setup func(KeyValue) DB, teardown func(DB)) {
+	if rnd == nil {
+		rnd = NewRand()
+	}
+
+	if p == nil {
+		BeforeEach(func() {
+			p = setup(kv)
+		})
+		if teardown != nil {
+			AfterEach(func() {
+				teardown(p)
+			})
+		}
+	}
+
+	It("Should find all keys with Find", func() {
+		if db, ok := p.(Find); ok {
+			TestFind(db, kv)
+		}
+	})
+
+	It("Should return error if Find on key after the last", func() {
+		if db, ok := p.(Find); ok {
+			TestFindAfterLast(db, kv)
+		}
+	})
+
+	It("Should only find exact key with Get", func() {
+		if db, ok := p.(Get); ok {
+			TestGet(db, kv)
+		}
+	})
+
+	It("Should only find present key with Has", func() {
+		if db, ok := p.(Has); ok {
+			TestHas(db, kv)
+		}
+	})
+
+	It("Should iterates and seeks correctly", func(done Done) {
+		if db, ok := p.(NewIterator); ok {
+			TestIter(db, nil, kv.Clone())
+		}
+		done <- true
+	}, 3.0)
+
+	It("Should iterates and seeks slice correctly", func(done Done) {
+		if db, ok := p.(NewIterator); ok {
+			RandomIndex(rnd, kv.Len(), Min(kv.Len(), 50), func(i int) {
+				type slice struct {
+					r            *util.Range
+					start, limit int
+				}
+
+				key_, _, _ := kv.IndexInexact(i)
+				for _, x := range []slice{
+					{&util.Range{Start: key_, Limit: nil}, i, kv.Len()},
+					{&util.Range{Start: nil, Limit: key_}, 0, i},
+				} {
+					By(fmt.Sprintf("Random index of %d .. %d", x.start, x.limit), func() {
+						TestIter(db, x.r, kv.Slice(x.start, x.limit))
+					})
+				}
+			})
+		}
+		done <- true
+	}, 50.0)
+
+	It("Should iterates and seeks slice correctly", func(done Done) {
+		if db, ok := p.(NewIterator); ok {
+			RandomRange(rnd, kv.Len(), Min(kv.Len(), 50), func(start, limit int) {
+				By(fmt.Sprintf("Random range of %d .. %d", start, limit), func() {
+					r := kv.Range(start, limit)
+					TestIter(db, &r, kv.Slice(start, limit))
+				})
+			})
+		}
+		done <- true
+	}, 50.0)
+}
+
+func AllKeyValueTesting(rnd *rand.Rand, body, setup func(KeyValue) DB, teardown func(DB)) {
+	Test := func(kv *KeyValue) func() {
+		return func() {
+			var p DB
+			if setup != nil {
+				Defer("setup", func() {
+					p = setup(*kv)
+				})
+			}
+			if teardown != nil {
+				Defer("teardown", func() {
+					teardown(p)
+				})
+			}
+			if body != nil {
+				p = body(*kv)
+			}
+			KeyValueTesting(rnd, *kv, p, func(KeyValue) DB {
+				return p
+			}, nil)
+		}
+	}
+
+	Describe("with no key/value (empty)", Test(&KeyValue{}))
+	Describe("with empty key", Test(KeyValue_EmptyKey()))
+	Describe("with empty value", Test(KeyValue_EmptyValue()))
+	Describe("with one key/value", Test(KeyValue_OneKeyValue()))
+	Describe("with big value", Test(KeyValue_BigValue()))
+	Describe("with special key", Test(KeyValue_SpecialKey()))
+	Describe("with multiple key/value", Test(KeyValue_MultipleKeyValue()))
+	Describe("with generated key/value", Test(KeyValue_Generate(nil, 120, 1, 50, 10, 120)))
+}

vendor/github.com/syndtr/goleveldb/leveldb/testutil/storage.go

@@ -0,0 +1,694 @@
+// Copyright (c) 2014, Suryandaru Triandana <syndtr@gmail.com>
+// All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package testutil
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"math/rand"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"sync"
+
+	. "github.com/onsi/gomega"
+
+	"github.com/syndtr/goleveldb/leveldb/storage"
+	"github.com/syndtr/goleveldb/leveldb/util"
+)
+
+var (
+	storageMu     sync.Mutex
+	storageUseFS  = true
+	storageKeepFS = false
+	storageNum    int
+)
+
+type StorageMode int
+
+const (
+	ModeOpen StorageMode = 1 << iota
+	ModeCreate
+	ModeRemove
+	ModeRename
+	ModeRead
+	ModeWrite
+	ModeSync
+	ModeClose
+)
+
+const (
+	modeOpen = iota
+	modeCreate
+	modeRemove
+	modeRename
+	modeRead
+	modeWrite
+	modeSync
+	modeClose
+
+	modeCount
+)
+
+const (
+	typeManifest = iota
+	typeJournal
+	typeTable
+	typeTemp
+
+	typeCount
+)
+
+const flattenCount = modeCount * typeCount
+
+func flattenType(m StorageMode, t storage.FileType) int {
+	var x int
+	switch m {
+	case ModeOpen:
+		x = modeOpen
+	case ModeCreate:
+		x = modeCreate
+	case ModeRemove:
+		x = modeRemove
+	case ModeRename:
+		x = modeRename
+	case ModeRead:
+		x = modeRead
+	case ModeWrite:
+		x = modeWrite
+	case ModeSync:
+		x = modeSync
+	case ModeClose:
+		x = modeClose
+	default:
+		panic("invalid storage mode")
+	}
+	x *= typeCount
+	switch t {
+	case storage.TypeManifest:
+		return x + typeManifest
+	case storage.TypeJournal:
+		return x + typeJournal
+	case storage.TypeTable:
+		return x + typeTable
+	case storage.TypeTemp:
+		return x + typeTemp
+	default:
+		panic("invalid file type")
+	}
+}
+
+func listFlattenType(m StorageMode, t storage.FileType) []int {
+	ret := make([]int, 0, flattenCount)
+	add := func(x int) {
+		x *= typeCount
+		switch {
+		case t&storage.TypeManifest != 0:
+			ret = append(ret, x+typeManifest)
+		case t&storage.TypeJournal != 0:
+			ret = append(ret, x+typeJournal)
+		case t&storage.TypeTable != 0:
+			ret = append(ret, x+typeTable)
+		case t&storage.TypeTemp != 0:
+			ret = append(ret, x+typeTemp)
+		}
+	}
+	switch {
+	case m&ModeOpen != 0:
+		add(modeOpen)
+	case m&ModeCreate != 0:
+		add(modeCreate)
+	case m&ModeRemove != 0:
+		add(modeRemove)
+	case m&ModeRename != 0:
+		add(modeRename)
+	case m&ModeRead != 0:
+		add(modeRead)
+	case m&ModeWrite != 0:
+		add(modeWrite)
+	case m&ModeSync != 0:
+		add(modeSync)
+	case m&ModeClose != 0:
+		add(modeClose)
+	}
+	return ret
+}
+
+func packFile(fd storage.FileDesc) uint64 {
+	if fd.Num>>(63-typeCount) != 0 {
+		panic("overflow")
+	}
+	return uint64(fd.Num<<typeCount) | uint64(fd.Type)
+}
+
+func unpackFile(x uint64) storage.FileDesc {
+	return storage.FileDesc{storage.FileType(x) & storage.TypeAll, int64(x >> typeCount)}
+}
+
+type emulatedError struct {
+	err error
+}
+
+func (err emulatedError) Error() string {
+	return fmt.Sprintf("emulated storage error: %v", err.err)
+}
+
+type storageLock struct {
+	s *Storage
+	r util.Releaser
+}
+
+func (l storageLock) Release() {
+	l.r.Release()
+	l.s.logI("storage lock released")
+}
+
+type reader struct {
+	s  *Storage
+	fd storage.FileDesc
+	storage.Reader
+}
+
+func (r *reader) Read(p []byte) (n int, err error) {
+	err = r.s.emulateError(ModeRead, r.fd.Type)
+	if err == nil {
+		r.s.stall(ModeRead, r.fd.Type)
+		n, err = r.Reader.Read(p)
+	}
+	r.s.count(ModeRead, r.fd.Type, n)
+	if err != nil && err != io.EOF {
+		r.s.logI("read error, fd=%s n=%d err=%v", r.fd, n, err)
+	}
+	return
+}
+
+func (r *reader) ReadAt(p []byte, off int64) (n int, err error) {
+	err = r.s.emulateError(ModeRead, r.fd.Type)
+	if err == nil {
+		r.s.stall(ModeRead, r.fd.Type)
+		n, err = r.Reader.ReadAt(p, off)
+	}
+	r.s.count(ModeRead, r.fd.Type, n)
+	if err != nil && err != io.EOF {
+		r.s.logI("readAt error, fd=%s offset=%d n=%d err=%v", r.fd, off, n, err)
+	}
+	return
+}
+
+func (r *reader) Close() (err error) {
+	return r.s.fileClose(r.fd, r.Reader)
+}
+
+type writer struct {
+	s  *Storage
+	fd storage.FileDesc
+	storage.Writer
+}
+
+func (w *writer) Write(p []byte) (n int, err error) {
+	err = w.s.emulateError(ModeWrite, w.fd.Type)
+	if err == nil {
+		w.s.stall(ModeWrite, w.fd.Type)
+		n, err = w.Writer.Write(p)
+	}
+	w.s.count(ModeWrite, w.fd.Type, n)
+	if err != nil && err != io.EOF {
+		w.s.logI("write error, fd=%s n=%d err=%v", w.fd, n, err)
+	}
+	return
+}
+
+func (w *writer) Sync() (err error) {
+	err = w.s.emulateError(ModeSync, w.fd.Type)
+	if err == nil {
+		w.s.stall(ModeSync, w.fd.Type)
+		err = w.Writer.Sync()
+	}
+	w.s.count(ModeSync, w.fd.Type, 0)
+	if err != nil {
+		w.s.logI("sync error, fd=%s err=%v", w.fd, err)
+	}
+	return
+}
+
+func (w *writer) Close() (err error) {
+	return w.s.fileClose(w.fd, w.Writer)
+}
+
+type Storage struct {
+	storage.Storage
+	path    string
+	onClose func() (preserve bool, err error)
+	onLog   func(str string)
+
+	lmu sync.Mutex
+	lb  bytes.Buffer
+
+	mu   sync.Mutex
+	rand *rand.Rand
+	// Open files, true=writer, false=reader
+	opens                   map[uint64]bool
+	counters                [flattenCount]int
+	bytesCounter            [flattenCount]int64
+	emulatedError           [flattenCount]error
+	emulatedErrorOnce       [flattenCount]bool
+	emulatedRandomError     [flattenCount]error
+	emulatedRandomErrorProb [flattenCount]float64
+	stallCond               sync.Cond
+	stalled                 [flattenCount]bool
+}
+
+func (s *Storage) log(skip int, str string) {
+	s.lmu.Lock()
+	defer s.lmu.Unlock()
+	_, file, line, ok := runtime.Caller(skip + 2)
+	if ok {
+		// Truncate file name at last file name separator.
+		if index := strings.LastIndex(file, "/"); index >= 0 {
+			file = file[index+1:]
+		} else if index = strings.LastIndex(file, "\\"); index >= 0 {
+			file = file[index+1:]
+		}
+	} else {
+		file = "???"
+		line = 1
+	}
+	fmt.Fprintf(&s.lb, "%s:%d: ", file, line)
+	lines := strings.Split(str, "\n")
+	if l := len(lines); l > 1 && lines[l-1] == "" {
+		lines = lines[:l-1]
+	}
+	for i, line := range lines {
+		if i > 0 {
+			s.lb.WriteString("\n\t")
+		}
+		s.lb.WriteString(line)
+	}
+	if s.onLog != nil {
+		s.onLog(s.lb.String())
+		s.lb.Reset()
+	} else {
+		s.lb.WriteByte('\n')
+	}
+}
+
+func (s *Storage) logISkip(skip int, format string, args ...interface{}) {
+	pc, _, _, ok := runtime.Caller(skip + 1)
+	if ok {
+		if f := runtime.FuncForPC(pc); f != nil {
+			fname := f.Name()
+			if index := strings.LastIndex(fname, "."); index >= 0 {
+				fname = fname[index+1:]
+			}
+			format = fname + ": " + format
+		}
+	}
+	s.log(skip+1, fmt.Sprintf(format, args...))
+}
+
+func (s *Storage) logI(format string, args ...interface{}) {
+	s.logISkip(1, format, args...)
+}
+
+func (s *Storage) OnLog(onLog func(log string)) {
+	s.lmu.Lock()
+	s.onLog = onLog
+	if s.lb.Len() != 0 {
+		log := s.lb.String()
+		s.onLog(log[:len(log)-1])
+		s.lb.Reset()
+	}
+	s.lmu.Unlock()
+}
+
+func (s *Storage) Log(str string) {
+	s.log(1, "Log: "+str)
+	s.Storage.Log(str)
+}
+
+func (s *Storage) Lock() (l storage.Lock, err error) {
+	l, err = s.Storage.Lock()
+	if err != nil {
+		s.logI("storage locking failed, err=%v", err)
+	} else {
+		s.logI("storage locked")
+		l = storageLock{s, l}
+	}
+	return
+}
+
+func (s *Storage) List(t storage.FileType) (fds []storage.FileDesc, err error) {
+	fds, err = s.Storage.List(t)
+	if err != nil {
+		s.logI("list failed, err=%v", err)
+		return
+	}
+	s.logI("list, type=0x%x count=%d", int(t), len(fds))
+	return
+}
+
+func (s *Storage) GetMeta() (fd storage.FileDesc, err error) {
+	fd, err = s.Storage.GetMeta()
+	if err != nil {
+		if !os.IsNotExist(err) {
+			s.logI("get meta failed, err=%v", err)
+		}
+		return
+	}
+	s.logI("get meta, fd=%s", fd)
+	return
+}
+
+func (s *Storage) SetMeta(fd storage.FileDesc) error {
+	ExpectWithOffset(1, fd.Type).To(Equal(storage.TypeManifest))
+	err := s.Storage.SetMeta(fd)
+	if err != nil {
+		s.logI("set meta failed, fd=%s err=%v", fd, err)
+	} else {
+		s.logI("set meta, fd=%s", fd)
+	}
+	return err
+}
+
+func (s *Storage) fileClose(fd storage.FileDesc, closer io.Closer) (err error) {
+	err = s.emulateError(ModeClose, fd.Type)
+	if err == nil {
+		s.stall(ModeClose, fd.Type)
+	}
+	x := packFile(fd)
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if err == nil {
+		ExpectWithOffset(2, s.opens).To(HaveKey(x), "File closed, fd=%s", fd)
+		err = closer.Close()
+	}
+	s.countNB(ModeClose, fd.Type, 0)
+	writer := s.opens[x]
+	if err != nil {
+		s.logISkip(1, "file close failed, fd=%s writer=%v err=%v", fd, writer, err)
+	} else {
+		s.logISkip(1, "file closed, fd=%s writer=%v", fd, writer)
+		delete(s.opens, x)
+	}
+	return
+}
+
+func (s *Storage) assertOpen(fd storage.FileDesc) {
+	x := packFile(fd)
+	ExpectWithOffset(2, s.opens).NotTo(HaveKey(x), "File open, fd=%s writer=%v", fd, s.opens[x])
+}
+
+func (s *Storage) Open(fd storage.FileDesc) (r storage.Reader, err error) {
+	err = s.emulateError(ModeOpen, fd.Type)
+	if err == nil {
+		s.stall(ModeOpen, fd.Type)
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if err == nil {
+		s.assertOpen(fd)
+		s.countNB(ModeOpen, fd.Type, 0)
+		r, err = s.Storage.Open(fd)
+	}
+	if err != nil {
+		s.logI("file open failed, fd=%s err=%v", fd, err)
+	} else {
+		s.logI("file opened, fd=%s", fd)
+		s.opens[packFile(fd)] = false
+		r = &reader{s, fd, r}
+	}
+	return
+}
+
+func (s *Storage) Create(fd storage.FileDesc) (w storage.Writer, err error) {
+	err = s.emulateError(ModeCreate, fd.Type)
+	if err == nil {
+		s.stall(ModeCreate, fd.Type)
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if err == nil {
+		s.assertOpen(fd)
+		s.countNB(ModeCreate, fd.Type, 0)
+		w, err = s.Storage.Create(fd)
+	}
+	if err != nil {
+		s.logI("file create failed, fd=%s err=%v", fd, err)
+	} else {
+		s.logI("file created, fd=%s", fd)
+		s.opens[packFile(fd)] = true
+		w = &writer{s, fd, w}
+	}
+	return
+}
+
+func (s *Storage) Remove(fd storage.FileDesc) (err error) {
+	err = s.emulateError(ModeRemove, fd.Type)
+	if err == nil {
+		s.stall(ModeRemove, fd.Type)
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if err == nil {
+		s.assertOpen(fd)
+		s.countNB(ModeRemove, fd.Type, 0)
+		err = s.Storage.Remove(fd)
+	}
+	if err != nil {
+		s.logI("file remove failed, fd=%s err=%v", fd, err)
+	} else {
+		s.logI("file removed, fd=%s", fd)
+	}
+	return
+}
+
+func (s *Storage) ForceRemove(fd storage.FileDesc) (err error) {
+	s.countNB(ModeRemove, fd.Type, 0)
+	if err = s.Storage.Remove(fd); err != nil {
+		s.logI("file remove failed (forced), fd=%s err=%v", fd, err)
+	} else {
+		s.logI("file removed (forced), fd=%s", fd)
+	}
+	return
+}
+
+func (s *Storage) Rename(oldfd, newfd storage.FileDesc) (err error) {
+	err = s.emulateError(ModeRename, oldfd.Type)
+	if err == nil {
+		s.stall(ModeRename, oldfd.Type)
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if err == nil {
+		s.assertOpen(oldfd)
+		s.assertOpen(newfd)
+		s.countNB(ModeRename, oldfd.Type, 0)
+		err = s.Storage.Rename(oldfd, newfd)
+	}
+	if err != nil {
+		s.logI("file rename failed, oldfd=%s newfd=%s err=%v", oldfd, newfd, err)
+	} else {
+		s.logI("file renamed, oldfd=%s newfd=%s", oldfd, newfd)
+	}
+	return
+}
+
+func (s *Storage) ForceRename(oldfd, newfd storage.FileDesc) (err error) {
+	s.countNB(ModeRename, oldfd.Type, 0)
+	if err = s.Storage.Rename(oldfd, newfd); err != nil {
+		s.logI("file rename failed (forced), oldfd=%s newfd=%s err=%v", oldfd, newfd, err)
+	} else {
+		s.logI("file renamed (forced), oldfd=%s newfd=%s", oldfd, newfd)
+	}
+	return
+}
+
+func (s *Storage) openFiles() string {
+	out := "Open files:"
+	for x, writer := range s.opens {
+		fd := unpackFile(x)
+		out += fmt.Sprintf("\n · fd=%s writer=%v", fd, writer)
+	}
+	return out
+}
+
+func (s *Storage) CloseCheck() {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	ExpectWithOffset(1, s.opens).To(BeEmpty(), s.openFiles())
+}
+
+func (s *Storage) OnClose(onClose func() (preserve bool, err error)) {
+	s.mu.Lock()
+	s.onClose = onClose
+	s.mu.Unlock()
+}
+
+func (s *Storage) Close() error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	ExpectWithOffset(1, s.opens).To(BeEmpty(), s.openFiles())
+	err := s.Storage.Close()
+	if err != nil {
+		s.logI("storage closing failed, err=%v", err)
+	} else {
+		s.logI("storage closed")
+	}
+	var preserve bool
+	if s.onClose != nil {
+		var err0 error
+		if preserve, err0 = s.onClose(); err0 != nil {
+			s.logI("onClose error, err=%v", err0)
+		}
+	}
+	if s.path != "" {
+		if storageKeepFS || preserve {
+			s.logI("storage is preserved, path=%v", s.path)
+		} else {
+			if err1 := os.RemoveAll(s.path); err1 != nil {
+				s.logI("cannot remove storage, err=%v", err1)
+			} else {
+				s.logI("storage has been removed")
+			}
+		}
+	}
+	return err
+}
+
+func (s *Storage) countNB(m StorageMode, t storage.FileType, n int) {
+	s.counters[flattenType(m, t)]++
+	s.bytesCounter[flattenType(m, t)] += int64(n)
+}
+
+func (s *Storage) count(m StorageMode, t storage.FileType, n int) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.countNB(m, t, n)
+}
+
+func (s *Storage) ResetCounter(m StorageMode, t storage.FileType) {
+	for _, x := range listFlattenType(m, t) {
+		s.counters[x] = 0
+		s.bytesCounter[x] = 0
+	}
+}
+
+func (s *Storage) Counter(m StorageMode, t storage.FileType) (count int, bytes int64) {
+	for _, x := range listFlattenType(m, t) {
+		count += s.counters[x]
+		bytes += s.bytesCounter[x]
+	}
+	return
+}
+
+func (s *Storage) emulateError(m StorageMode, t storage.FileType) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	x := flattenType(m, t)
+	if err := s.emulatedError[x]; err != nil {
+		if s.emulatedErrorOnce[x] {
+			s.emulatedError[x] = nil
+		}
+		return emulatedError{err}
+	}
+	if err := s.emulatedRandomError[x]; err != nil && s.rand.Float64() < s.emulatedRandomErrorProb[x] {
+		return emulatedError{err}
+	}
+	return nil
+}
+
+func (s *Storage) EmulateError(m StorageMode, t storage.FileType, err error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	for _, x := range listFlattenType(m, t) {
+		s.emulatedError[x] = err
+		s.emulatedErrorOnce[x] = false
+	}
+}
+
+func (s *Storage) EmulateErrorOnce(m StorageMode, t storage.FileType, err error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	for _, x := range listFlattenType(m, t) {
+		s.emulatedError[x] = err
+		s.emulatedErrorOnce[x] = true
+	}
+}
+
+func (s *Storage) EmulateRandomError(m StorageMode, t storage.FileType, prob float64, err error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	for _, x := range listFlattenType(m, t) {
+		s.emulatedRandomError[x] = err
+		s.emulatedRandomErrorProb[x] = prob
+	}
+}
+
+func (s *Storage) stall(m StorageMode, t storage.FileType) {
+	x := flattenType(m, t)
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	for s.stalled[x] {
+		s.stallCond.Wait()
+	}
+}
+
+func (s *Storage) Stall(m StorageMode, t storage.FileType) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	for _, x := range listFlattenType(m, t) {
+		s.stalled[x] = true
+	}
+}
+
+func (s *Storage) Release(m StorageMode, t storage.FileType) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	for _, x := range listFlattenType(m, t) {
+		s.stalled[x] = false
+	}
+	s.stallCond.Broadcast()
+}
+
+func NewStorage() *Storage {
+	var (
+		stor storage.Storage
+		path string
+	)
+	if storageUseFS {
+		for {
+			storageMu.Lock()
+			num := storageNum
+			storageNum++
+			storageMu.Unlock()
+			path = filepath.Join(os.TempDir(), fmt.Sprintf("goleveldb-test%d0%d0%d", os.Getuid(), os.Getpid(), num))
+			if _, err := os.Stat(path); os.IsNotExist(err) {
+				stor, err = storage.OpenFile(path, false)
+				ExpectWithOffset(1, err).NotTo(HaveOccurred(), "creating storage at %s", path)
+				break
+			}
+		}
+	} else {
+		stor = storage.NewMemStorage()
+	}
+	s := &Storage{
+		Storage: stor,
+		path:    path,
+		rand:    NewRand(),
+		opens:   make(map[uint64]bool),
+	}
+	s.stallCond.L = &s.mu
+	if s.path != "" {
+		s.logI("using FS storage")
+		s.logI("storage path: %s", s.path)
+	} else {
+		s.logI("using MEM storage")
+	}
+	return s
+}

vendor/github.com/syndtr/goleveldb/leveldb/testutil/util.go

@@ -0,0 +1,171 @@
+// Copyright (c) 2014, Suryandaru Triandana <syndtr@gmail.com>
+// All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package testutil
+
+import (
+	"bytes"
+	"flag"
+	"math/rand"
+	"reflect"
+	"sync"
+
+	"github.com/onsi/ginkgo/config"
+
+	"github.com/syndtr/goleveldb/leveldb/comparer"
+)
+
+var (
+	runfn = make(map[string][]func())
+	runmu sync.Mutex
+)
+
+func Defer(args ...interface{}) bool {
+	var (
+		group string
+		fn    func()
+	)
+	for _, arg := range args {
+		v := reflect.ValueOf(arg)
+		switch v.Kind() {
+		case reflect.String:
+			group = v.String()
+		case reflect.Func:
+			r := reflect.ValueOf(&fn).Elem()
+			r.Set(v)
+		}
+	}
+	if fn != nil {
+		runmu.Lock()
+		runfn[group] = append(runfn[group], fn)
+		runmu.Unlock()
+	}
+	return true
+}
+
+func RunDefer(groups ...string) bool {
+	if len(groups) == 0 {
+		groups = append(groups, "")
+	}
+	runmu.Lock()
+	var runfn_ []func()
+	for _, group := range groups {
+		runfn_ = append(runfn_, runfn[group]...)
+		delete(runfn, group)
+	}
+	runmu.Unlock()
+	for _, fn := range runfn_ {
+		fn()
+	}
+	return runfn_ != nil
+}
+
+func RandomSeed() int64 {
+	if !flag.Parsed() {
+		panic("random seed not initialized")
+	}
+	return config.GinkgoConfig.RandomSeed
+}
+
+func NewRand() *rand.Rand {
+	return rand.New(rand.NewSource(RandomSeed()))
+}
+
+var cmp = comparer.DefaultComparer
+
+func BytesSeparator(a, b []byte) []byte {
+	if bytes.Equal(a, b) {
+		return b
+	}
+	i, n := 0, len(a)
+	if n > len(b) {
+		n = len(b)
+	}
+	for ; i < n && (a[i] == b[i]); i++ {
+	}
+	x := append([]byte{}, a[:i]...)
+	if i < n {
+		if c := a[i] + 1; c < b[i] {
+			return append(x, c)
+		}
+		x = append(x, a[i])
+		i++
+	}
+	for ; i < len(a); i++ {
+		if c := a[i]; c < 0xff {
+			return append(x, c+1)
+		} else {
+			x = append(x, c)
+		}
+	}
+	if len(b) > i && b[i] > 0 {
+		return append(x, b[i]-1)
+	}
+	return append(x, 'x')
+}
+
+func BytesAfter(b []byte) []byte {
+	var x []byte
+	for _, c := range b {
+		if c < 0xff {
+			return append(x, c+1)
+		} else {
+			x = append(x, c)
+		}
+	}
+	return append(x, 'x')
+}
+
+func RandomIndex(rnd *rand.Rand, n, round int, fn func(i int)) {
+	if rnd == nil {
+		rnd = NewRand()
+	}
+	for x := 0; x < round; x++ {
+		fn(rnd.Intn(n))
+	}
+	return
+}
+
+func ShuffledIndex(rnd *rand.Rand, n, round int, fn func(i int)) {
+	if rnd == nil {
+		rnd = NewRand()
+	}
+	for x := 0; x < round; x++ {
+		for _, i := range rnd.Perm(n) {
+			fn(i)
+		}
+	}
+	return
+}
+
+func RandomRange(rnd *rand.Rand, n, round int, fn func(start, limit int)) {
+	if rnd == nil {
+		rnd = NewRand()
+	}
+	for x := 0; x < round; x++ {
+		start := rnd.Intn(n)
+		length := 0
+		if j := n - start; j > 0 {
+			length = rnd.Intn(j)
+		}
+		fn(start, start+length)
+	}
+	return
+}
+
+func Max(x, y int) int {
+	if x > y {
+		return x
+	}
+	return y
+}
+
+func Min(x, y int) int {
+	if x < y {
+		return x
+	}
+	return y
+}