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wal_test.go
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wal_test.go
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package wal
import (
"fmt"
"io"
"math/rand"
"os"
"regexp"
"strings"
"sync"
"testing"
"github.com/stretchr/testify/assert"
)
func DestryWLog(log *WLog) {
if log != nil {
log.Close()
os.RemoveAll(log.path)
}
}
func CraeteWLog(segmentSize uint64, cacheSize uint64) *WLog {
log_folder, _ := os.MkdirTemp("", "log_folder")
opts := Options{
DirPath: log_folder,
FsSync: true,
SegmentSize: segmentSize,
CacheSize: cacheSize,
BytesToSync: KB,
readWithCRC: true,
}
log, _ := Open(opts)
return log
}
func TestOpenWLogAndWrite(t *testing.T) {
log := CraeteWLog(MB, 0)
defer DestryWLog(log)
logPostion, err := log.Write([]byte("hello"))
assert.Nil(t, err)
assert.Equal(t, uint64(0), logPostion.id)
assert.Equal(t, uint64(0), logPostion.segmentIndex)
// The segment header is 8 bytes
assert.Equal(t, uint64(8), logPostion.logOffset)
assert.Equal(t, uint32(5), logPostion.logSize)
logPostion, err = log.Write([]byte("world!"))
assert.Nil(t, err)
assert.Equal(t, uint64(1), logPostion.id)
assert.Equal(t, uint64(0), logPostion.segmentIndex)
// The segment header + log header + 5
assert.Equal(t, uint64(21), logPostion.logOffset)
assert.Equal(t, uint32(6), logPostion.logSize)
}
func TestWLogWriteAndRead(t *testing.T) {
log := CraeteWLog(MB, 0)
defer DestryWLog(log)
var str = "abcdefghijklmnopq"
for i := 1; i < len(str); i++ {
_, err := log.Write([]byte(str[:i]))
assert.Nil(t, err)
}
for i := 1; i < len(str); i++ {
buffer, err := log.Read(uint64(i - 1))
assert.Nil(t, err)
assert.Equal(t, str[:i], string(buffer))
}
}
func TestWLogWriteAndReOpen(t *testing.T) {
log := CraeteWLog(10*KB, 0)
// Firt wrte data to WLog
for i := 0; i < 50; i++ {
_, err := log.Write(make([]byte, 3*KB))
assert.Nil(t, err)
}
path := log.path
// Close it
log.Close()
opts := Options{
DirPath: path,
FsSync: true,
SegmentSize: 10 * KB,
CacheSize: 0,
BytesToSync: KB,
readWithCRC: true,
}
// Reopen it for reading and writing
log, err := Open(opts)
assert.Nil(t, err)
assert.Equal(t, uint64(50), log.GetLogCount())
for i := 0; i < 50; i++ {
_, err := log.Read(uint64(i))
assert.Nil(t, err)
}
// Write 50 more new logs
for i := 0; i < 50; i++ {
_, err := log.Write(make([]byte, 3*KB))
assert.Nil(t, err)
}
// Read totall 100 logs
for i := 0; i < 100; i++ {
_, err := log.Read(uint64(i))
assert.Nil(t, err)
}
DestryWLog(log)
}
func TestMultipleSegments(t *testing.T) {
log := CraeteWLog(10*KB+8, 0)
defer DestryWLog(log)
for i := 0; i < 20; i++ {
buffer := make([]byte, 2*KB-8)
logPos, err := log.Write(buffer)
assert.Nil(t, err)
assert.Equal(t, uint64((i*2)/10), logPos.segmentIndex)
}
for i := 0; i < 20; i++ {
_, err := log.Read(uint64(i))
assert.Nil(t, err)
assert.LessOrEqual(t, uint64(i), log.GetLogCount())
}
}
func TestMultipleReaderAndWriter(t *testing.T) {
log := CraeteWLog(10*MB, 0)
defer DestryWLog(log)
// Writing goroutins
var wg sync.WaitGroup
for i := 0; i < 20; i++ {
wg.Add(1)
i := i
go func(i int) {
defer wg.Done()
for j := 0; j < 10; j++ {
_, err := log.Write([]byte(fmt.Sprintf("log message %d from process %d", j, i)))
assert.Nil(t, err)
}
}(i)
}
wg.Wait()
assert.Equal(t, uint64(200), log.GetLogCount())
// Reading goroutins
for i := 0; i < 20; i++ {
wg.Add(1)
i := i
go func(i int) {
defer wg.Done()
for j := i * 10; j < (i+1)*10; j++ {
buffer, err := log.Read(uint64(j))
assert.Nil(t, err)
match, _ := regexp.MatchString(`log message \d+ from process \d+`, string(buffer))
assert.True(t, match)
}
}(i)
}
wg.Wait()
}
func TestWLogIteratorE2E(t *testing.T) {
log := CraeteWLog(10*KB, 0)
defer DestryWLog(log)
// Dump some data
for i := 0; i < 1000; i++ {
_, err := log.Write(make([]byte, 3*KB))
assert.Nil(t, err)
}
logIterator := NewWLogIterator(log)
var expectedLogIndex uint64 = 0
for {
data, logIndex, err := logIterator.Next()
if err == io.EOF {
break
}
assert.Nil(t, err)
assert.Equal(t, 3*KB, len(data))
assert.Equal(t, expectedLogIndex, logIndex)
expectedLogIndex++
}
assert.Equal(t, log.GetLogCount(), expectedLogIndex)
}
func TestWriteAndRandReadE2E(t *testing.T) {
// With cache enabled
log := CraeteWLog(10*KB, 0)
defer DestryWLog(log)
r := rand.New(rand.NewSource(33))
numLogs := 1000
// Write logs with variable sizes.
logMap := make(map[uint64]string)
logWord := []string{"a", "b", "c", "d", "e", "f", "g"}
for i := 0; i < numLogs; i++ {
logCharactor := logWord[int(r.Int31n(int32(len(logWord))))]
logLength := 1 + r.Int31n(int32(10*KB-1))
logMessage := strings.Repeat(logCharactor, int(logLength))
_, err := log.Write([]byte(logMessage))
logMap[uint64(i)] = logMessage
assert.Nil(t, err)
}
log.sync()
// Read logs with variable log message
for i := 0; i < 1000; i++ {
logIndex := uint64(r.Int63n(int64(numLogs)))
buffer, err := log.Read(logIndex)
assert.Nil(t, err)
assert.Equal(t, logMap[logIndex], string(buffer))
}
}