syncthing/vendor/github.com/syndtr/goleveldb/leveldb/journal/journal_test.go

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// Copyright 2011 The LevelDB-Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Taken from: https://code.google.com/p/leveldb-go/source/browse/leveldb/record/record_test.go?r=df1fa28f7f3be6c3935548169002309c12967135
// License, authors and contributors informations can be found at bellow URLs respectively:
// https://code.google.com/p/leveldb-go/source/browse/LICENSE
// https://code.google.com/p/leveldb-go/source/browse/AUTHORS
// https://code.google.com/p/leveldb-go/source/browse/CONTRIBUTORS
package journal
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"io/ioutil"
"math/rand"
"strings"
"testing"
)
type dropper struct {
t *testing.T
}
func (d dropper) Drop(err error) {
d.t.Log(err)
}
func short(s string) string {
if len(s) < 64 {
return s
}
return fmt.Sprintf("%s...(skipping %d bytes)...%s", s[:20], len(s)-40, s[len(s)-20:])
}
// big returns a string of length n, composed of repetitions of partial.
func big(partial string, n int) string {
return strings.Repeat(partial, n/len(partial)+1)[:n]
}
func TestEmpty(t *testing.T) {
buf := new(bytes.Buffer)
r := NewReader(buf, dropper{t}, true, true)
if _, err := r.Next(); err != io.EOF {
t.Fatalf("got %v, want %v", err, io.EOF)
}
}
func testGenerator(t *testing.T, reset func(), gen func() (string, bool)) {
buf := new(bytes.Buffer)
reset()
w := NewWriter(buf)
for {
s, ok := gen()
if !ok {
break
}
ww, err := w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write([]byte(s)); err != nil {
t.Fatal(err)
}
}
if err := w.Close(); err != nil {
t.Fatal(err)
}
reset()
r := NewReader(buf, dropper{t}, true, true)
for {
s, ok := gen()
if !ok {
break
}
rr, err := r.Next()
if err != nil {
t.Fatal(err)
}
x, err := ioutil.ReadAll(rr)
if err != nil {
t.Fatal(err)
}
if string(x) != s {
t.Fatalf("got %q, want %q", short(string(x)), short(s))
}
}
if _, err := r.Next(); err != io.EOF {
t.Fatalf("got %v, want %v", err, io.EOF)
}
}
func testLiterals(t *testing.T, s []string) {
var i int
reset := func() {
i = 0
}
gen := func() (string, bool) {
if i == len(s) {
return "", false
}
i++
return s[i-1], true
}
testGenerator(t, reset, gen)
}
func TestMany(t *testing.T) {
const n = 1e5
var i int
reset := func() {
i = 0
}
gen := func() (string, bool) {
if i == n {
return "", false
}
i++
return fmt.Sprintf("%d.", i-1), true
}
testGenerator(t, reset, gen)
}
func TestRandom(t *testing.T) {
const n = 1e2
var (
i int
r *rand.Rand
)
reset := func() {
i, r = 0, rand.New(rand.NewSource(0))
}
gen := func() (string, bool) {
if i == n {
return "", false
}
i++
return strings.Repeat(string(uint8(i)), r.Intn(2*blockSize+16)), true
}
testGenerator(t, reset, gen)
}
func TestBasic(t *testing.T) {
testLiterals(t, []string{
strings.Repeat("a", 1000),
strings.Repeat("b", 97270),
strings.Repeat("c", 8000),
})
}
func TestBoundary(t *testing.T) {
for i := blockSize - 16; i < blockSize+16; i++ {
s0 := big("abcd", i)
for j := blockSize - 16; j < blockSize+16; j++ {
s1 := big("ABCDE", j)
testLiterals(t, []string{s0, s1})
testLiterals(t, []string{s0, "", s1})
testLiterals(t, []string{s0, "x", s1})
}
}
}
func TestFlush(t *testing.T) {
buf := new(bytes.Buffer)
w := NewWriter(buf)
// Write a couple of records. Everything should still be held
// in the record.Writer buffer, so that buf.Len should be 0.
w0, _ := w.Next()
w0.Write([]byte("0"))
w1, _ := w.Next()
w1.Write([]byte("11"))
if got, want := buf.Len(), 0; got != want {
t.Fatalf("buffer length #0: got %d want %d", got, want)
}
// Flush the record.Writer buffer, which should yield 17 bytes.
// 17 = 2*7 + 1 + 2, which is two headers and 1 + 2 payload bytes.
if err := w.Flush(); err != nil {
t.Fatal(err)
}
if got, want := buf.Len(), 17; got != want {
t.Fatalf("buffer length #1: got %d want %d", got, want)
}
// Do another write, one that isn't large enough to complete the block.
// The write should not have flowed through to buf.
w2, _ := w.Next()
w2.Write(bytes.Repeat([]byte("2"), 10000))
if got, want := buf.Len(), 17; got != want {
t.Fatalf("buffer length #2: got %d want %d", got, want)
}
// Flushing should get us up to 10024 bytes written.
// 10024 = 17 + 7 + 10000.
if err := w.Flush(); err != nil {
t.Fatal(err)
}
if got, want := buf.Len(), 10024; got != want {
t.Fatalf("buffer length #3: got %d want %d", got, want)
}
// Do a bigger write, one that completes the current block.
// We should now have 32768 bytes (a complete block), without
// an explicit flush.
w3, _ := w.Next()
w3.Write(bytes.Repeat([]byte("3"), 40000))
if got, want := buf.Len(), 32768; got != want {
t.Fatalf("buffer length #4: got %d want %d", got, want)
}
// Flushing should get us up to 50038 bytes written.
// 50038 = 10024 + 2*7 + 40000. There are two headers because
// the one record was split into two chunks.
if err := w.Flush(); err != nil {
t.Fatal(err)
}
if got, want := buf.Len(), 50038; got != want {
t.Fatalf("buffer length #5: got %d want %d", got, want)
}
// Check that reading those records give the right lengths.
r := NewReader(buf, dropper{t}, true, true)
wants := []int64{1, 2, 10000, 40000}
for i, want := range wants {
rr, _ := r.Next()
n, err := io.Copy(ioutil.Discard, rr)
if err != nil {
t.Fatalf("read #%d: %v", i, err)
}
if n != want {
t.Fatalf("read #%d: got %d bytes want %d", i, n, want)
}
}
}
func TestNonExhaustiveRead(t *testing.T) {
const n = 100
buf := new(bytes.Buffer)
p := make([]byte, 10)
rnd := rand.New(rand.NewSource(1))
w := NewWriter(buf)
for i := 0; i < n; i++ {
length := len(p) + rnd.Intn(3*blockSize)
s := string(uint8(i)) + "123456789abcdefgh"
ww, _ := w.Next()
ww.Write([]byte(big(s, length)))
}
if err := w.Close(); err != nil {
t.Fatal(err)
}
r := NewReader(buf, dropper{t}, true, true)
for i := 0; i < n; i++ {
rr, _ := r.Next()
_, err := io.ReadFull(rr, p)
if err != nil {
t.Fatal(err)
}
want := string(uint8(i)) + "123456789"
if got := string(p); got != want {
t.Fatalf("read #%d: got %q want %q", i, got, want)
}
}
}
func TestStaleReader(t *testing.T) {
buf := new(bytes.Buffer)
w := NewWriter(buf)
w0, err := w.Next()
if err != nil {
t.Fatal(err)
}
w0.Write([]byte("0"))
w1, err := w.Next()
if err != nil {
t.Fatal(err)
}
w1.Write([]byte("11"))
if err := w.Close(); err != nil {
t.Fatal(err)
}
r := NewReader(buf, dropper{t}, true, true)
r0, err := r.Next()
if err != nil {
t.Fatal(err)
}
r1, err := r.Next()
if err != nil {
t.Fatal(err)
}
p := make([]byte, 1)
if _, err := r0.Read(p); err == nil || !strings.Contains(err.Error(), "stale") {
t.Fatalf("stale read #0: unexpected error: %v", err)
}
if _, err := r1.Read(p); err != nil {
t.Fatalf("fresh read #1: got %v want nil error", err)
}
if p[0] != '1' {
t.Fatalf("fresh read #1: byte contents: got '%c' want '1'", p[0])
}
}
func TestStaleWriter(t *testing.T) {
buf := new(bytes.Buffer)
w := NewWriter(buf)
w0, err := w.Next()
if err != nil {
t.Fatal(err)
}
w1, err := w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := w0.Write([]byte("0")); err == nil || !strings.Contains(err.Error(), "stale") {
t.Fatalf("stale write #0: unexpected error: %v", err)
}
if _, err := w1.Write([]byte("11")); err != nil {
t.Fatalf("fresh write #1: got %v want nil error", err)
}
if err := w.Flush(); err != nil {
t.Fatalf("flush: %v", err)
}
if _, err := w1.Write([]byte("0")); err == nil || !strings.Contains(err.Error(), "stale") {
t.Fatalf("stale write #1: unexpected error: %v", err)
}
}
func TestCorrupt_MissingLastBlock(t *testing.T) {
buf := new(bytes.Buffer)
w := NewWriter(buf)
// First record.
ww, err := w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), blockSize-1024)); err != nil {
t.Fatalf("write #0: unexpected error: %v", err)
}
// Second record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), blockSize-headerSize)); err != nil {
t.Fatalf("write #1: unexpected error: %v", err)
}
if err := w.Close(); err != nil {
t.Fatal(err)
}
// Cut the last block.
b := buf.Bytes()[:blockSize]
r := NewReader(bytes.NewReader(b), dropper{t}, false, true)
// First read.
rr, err := r.Next()
if err != nil {
t.Fatal(err)
}
n, err := io.Copy(ioutil.Discard, rr)
if err != nil {
t.Fatalf("read #0: %v", err)
}
if n != blockSize-1024 {
t.Fatalf("read #0: got %d bytes want %d", n, blockSize-1024)
}
// Second read.
rr, err = r.Next()
if err != nil {
t.Fatal(err)
}
n, err = io.Copy(ioutil.Discard, rr)
if err != io.ErrUnexpectedEOF {
t.Fatalf("read #1: unexpected error: %v", err)
}
if _, err := r.Next(); err != io.EOF {
t.Fatalf("last next: unexpected error: %v", err)
}
}
func TestCorrupt_CorruptedFirstBlock(t *testing.T) {
buf := new(bytes.Buffer)
w := NewWriter(buf)
// First record.
ww, err := w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), blockSize/2)); err != nil {
t.Fatalf("write #0: unexpected error: %v", err)
}
// Second record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), blockSize-headerSize)); err != nil {
t.Fatalf("write #1: unexpected error: %v", err)
}
// Third record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), (blockSize-headerSize)+1)); err != nil {
t.Fatalf("write #2: unexpected error: %v", err)
}
// Fourth record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), (blockSize-headerSize)+2)); err != nil {
t.Fatalf("write #3: unexpected error: %v", err)
}
if err := w.Close(); err != nil {
t.Fatal(err)
}
b := buf.Bytes()
// Corrupting block #0.
for i := 0; i < 1024; i++ {
b[i] = '1'
}
r := NewReader(bytes.NewReader(b), dropper{t}, false, true)
// First read (third record).
rr, err := r.Next()
if err != nil {
t.Fatal(err)
}
n, err := io.Copy(ioutil.Discard, rr)
if err != nil {
t.Fatalf("read #0: %v", err)
}
if want := int64(blockSize-headerSize) + 1; n != want {
t.Fatalf("read #0: got %d bytes want %d", n, want)
}
// Second read (fourth record).
rr, err = r.Next()
if err != nil {
t.Fatal(err)
}
n, err = io.Copy(ioutil.Discard, rr)
if err != nil {
t.Fatalf("read #1: %v", err)
}
if want := int64(blockSize-headerSize) + 2; n != want {
t.Fatalf("read #1: got %d bytes want %d", n, want)
}
if _, err := r.Next(); err != io.EOF {
t.Fatalf("last next: unexpected error: %v", err)
}
}
func TestCorrupt_CorruptedMiddleBlock(t *testing.T) {
buf := new(bytes.Buffer)
w := NewWriter(buf)
// First record.
ww, err := w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), blockSize/2)); err != nil {
t.Fatalf("write #0: unexpected error: %v", err)
}
// Second record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), blockSize-headerSize)); err != nil {
t.Fatalf("write #1: unexpected error: %v", err)
}
// Third record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), (blockSize-headerSize)+1)); err != nil {
t.Fatalf("write #2: unexpected error: %v", err)
}
// Fourth record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), (blockSize-headerSize)+2)); err != nil {
t.Fatalf("write #3: unexpected error: %v", err)
}
if err := w.Close(); err != nil {
t.Fatal(err)
}
b := buf.Bytes()
// Corrupting block #1.
for i := 0; i < 1024; i++ {
b[blockSize+i] = '1'
}
r := NewReader(bytes.NewReader(b), dropper{t}, false, true)
// First read (first record).
rr, err := r.Next()
if err != nil {
t.Fatal(err)
}
n, err := io.Copy(ioutil.Discard, rr)
if err != nil {
t.Fatalf("read #0: %v", err)
}
if want := int64(blockSize / 2); n != want {
t.Fatalf("read #0: got %d bytes want %d", n, want)
}
// Second read (second record).
rr, err = r.Next()
if err != nil {
t.Fatal(err)
}
n, err = io.Copy(ioutil.Discard, rr)
if err != io.ErrUnexpectedEOF {
t.Fatalf("read #1: unexpected error: %v", err)
}
// Third read (fourth record).
rr, err = r.Next()
if err != nil {
t.Fatal(err)
}
n, err = io.Copy(ioutil.Discard, rr)
if err != nil {
t.Fatalf("read #2: %v", err)
}
if want := int64(blockSize-headerSize) + 2; n != want {
t.Fatalf("read #2: got %d bytes want %d", n, want)
}
if _, err := r.Next(); err != io.EOF {
t.Fatalf("last next: unexpected error: %v", err)
}
}
func TestCorrupt_CorruptedLastBlock(t *testing.T) {
buf := new(bytes.Buffer)
w := NewWriter(buf)
// First record.
ww, err := w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), blockSize/2)); err != nil {
t.Fatalf("write #0: unexpected error: %v", err)
}
// Second record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), blockSize-headerSize)); err != nil {
t.Fatalf("write #1: unexpected error: %v", err)
}
// Third record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), (blockSize-headerSize)+1)); err != nil {
t.Fatalf("write #2: unexpected error: %v", err)
}
// Fourth record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), (blockSize-headerSize)+2)); err != nil {
t.Fatalf("write #3: unexpected error: %v", err)
}
if err := w.Close(); err != nil {
t.Fatal(err)
}
b := buf.Bytes()
// Corrupting block #3.
for i := len(b) - 1; i > len(b)-1024; i-- {
b[i] = '1'
}
r := NewReader(bytes.NewReader(b), dropper{t}, false, true)
// First read (first record).
rr, err := r.Next()
if err != nil {
t.Fatal(err)
}
n, err := io.Copy(ioutil.Discard, rr)
if err != nil {
t.Fatalf("read #0: %v", err)
}
if want := int64(blockSize / 2); n != want {
t.Fatalf("read #0: got %d bytes want %d", n, want)
}
// Second read (second record).
rr, err = r.Next()
if err != nil {
t.Fatal(err)
}
n, err = io.Copy(ioutil.Discard, rr)
if err != nil {
t.Fatalf("read #1: %v", err)
}
if want := int64(blockSize - headerSize); n != want {
t.Fatalf("read #1: got %d bytes want %d", n, want)
}
// Third read (third record).
rr, err = r.Next()
if err != nil {
t.Fatal(err)
}
n, err = io.Copy(ioutil.Discard, rr)
if err != nil {
t.Fatalf("read #2: %v", err)
}
if want := int64(blockSize-headerSize) + 1; n != want {
t.Fatalf("read #2: got %d bytes want %d", n, want)
}
// Fourth read (fourth record).
rr, err = r.Next()
if err != nil {
t.Fatal(err)
}
n, err = io.Copy(ioutil.Discard, rr)
if err != io.ErrUnexpectedEOF {
t.Fatalf("read #3: unexpected error: %v", err)
}
if _, err := r.Next(); err != io.EOF {
t.Fatalf("last next: unexpected error: %v", err)
}
}
func TestCorrupt_FirstChuckLengthOverflow(t *testing.T) {
buf := new(bytes.Buffer)
w := NewWriter(buf)
// First record.
ww, err := w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), blockSize/2)); err != nil {
t.Fatalf("write #0: unexpected error: %v", err)
}
// Second record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), blockSize-headerSize)); err != nil {
t.Fatalf("write #1: unexpected error: %v", err)
}
// Third record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), (blockSize-headerSize)+1)); err != nil {
t.Fatalf("write #2: unexpected error: %v", err)
}
if err := w.Close(); err != nil {
t.Fatal(err)
}
b := buf.Bytes()
// Corrupting record #1.
x := blockSize
binary.LittleEndian.PutUint16(b[x+4:], 0xffff)
r := NewReader(bytes.NewReader(b), dropper{t}, false, true)
// First read (first record).
rr, err := r.Next()
if err != nil {
t.Fatal(err)
}
n, err := io.Copy(ioutil.Discard, rr)
if err != nil {
t.Fatalf("read #0: %v", err)
}
if want := int64(blockSize / 2); n != want {
t.Fatalf("read #0: got %d bytes want %d", n, want)
}
// Second read (second record).
rr, err = r.Next()
if err != nil {
t.Fatal(err)
}
n, err = io.Copy(ioutil.Discard, rr)
if err != io.ErrUnexpectedEOF {
t.Fatalf("read #1: unexpected error: %v", err)
}
if _, err := r.Next(); err != io.EOF {
t.Fatalf("last next: unexpected error: %v", err)
}
}
func TestCorrupt_MiddleChuckLengthOverflow(t *testing.T) {
buf := new(bytes.Buffer)
w := NewWriter(buf)
// First record.
ww, err := w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), blockSize/2)); err != nil {
t.Fatalf("write #0: unexpected error: %v", err)
}
// Second record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), blockSize-headerSize)); err != nil {
t.Fatalf("write #1: unexpected error: %v", err)
}
// Third record.
ww, err = w.Next()
if err != nil {
t.Fatal(err)
}
if _, err := ww.Write(bytes.Repeat([]byte("0"), (blockSize-headerSize)+1)); err != nil {
t.Fatalf("write #2: unexpected error: %v", err)
}
if err := w.Close(); err != nil {
t.Fatal(err)
}
b := buf.Bytes()
// Corrupting record #1.
x := blockSize/2 + headerSize
binary.LittleEndian.PutUint16(b[x+4:], 0xffff)
r := NewReader(bytes.NewReader(b), dropper{t}, false, true)
// First read (first record).
rr, err := r.Next()
if err != nil {
t.Fatal(err)
}
n, err := io.Copy(ioutil.Discard, rr)
if err != nil {
t.Fatalf("read #0: %v", err)
}
if want := int64(blockSize / 2); n != want {
t.Fatalf("read #0: got %d bytes want %d", n, want)
}
// Second read (third record).
rr, err = r.Next()
if err != nil {
t.Fatal(err)
}
n, err = io.Copy(ioutil.Discard, rr)
if err != nil {
t.Fatalf("read #1: %v", err)
}
if want := int64(blockSize-headerSize) + 1; n != want {
t.Fatalf("read #1: got %d bytes want %d", n, want)
}
if _, err := r.Next(); err != io.EOF {
t.Fatalf("last next: unexpected error: %v", err)
}
}