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wal_test.go
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wal_test.go
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package toywal
import (
"io"
"os"
"strings"
"testing"
"github.com/stretchr/testify/assert"
)
func testWriteAndIterate(t *testing.T, wal *WAL, size int, valueSize int) {
val := strings.Repeat("wal", valueSize)
positions := make([]*ChunkPosition, size)
for i := 0; i < size; i++ {
pos, err := wal.Write([]byte(val))
assert.Nil(t, err)
positions[i] = pos
}
var count int
reader := wal.NewReader()
for {
data, pos, err := reader.Next()
if err != nil {
break
}
assert.Equal(t, val, string(data))
assert.Equal(t, positions[count].SegmentId, pos.SegmentId)
assert.Equal(t, positions[count].BlockId, pos.BlockId)
assert.Equal(t, positions[count].ChunkOffset, pos.ChunkOffset)
count++
}
assert.Equal(t, size, count)
}
func testWriteAllIterate(t *testing.T, wal *WAL, size, valueSize int) {
positions := make([]ChunkPosition, 0)
for i := 0; i < size; i++ {
val := strings.Repeat("wal", valueSize)
pos, err := wal.Write([]byte(val))
assert.Nil(t, err)
positions = append(positions, *pos)
}
count := 0
reader := wal.NewReader()
for {
data, pos, err := reader.Next()
if err != nil {
break
}
assert.Equal(t, strings.Repeat("wal", valueSize), string(data))
assert.Equal(t, positions[count].SegmentId, pos.SegmentId)
assert.Equal(t, positions[count].BlockId, pos.BlockId)
assert.Equal(t, positions[count].ChunkOffset, pos.ChunkOffset)
count++
}
}
func setupWAL(t *testing.T, name string) *WAL {
dir, _ := os.MkdirTemp("", name)
opts := &Options{
DirPath: dir,
SegmentFileSuffix: ".SEG",
SegmentSize: 32 * MB,
BlockCacheSize: 32 * KB * 10,
}
wal, err := New(opts)
assert.Nil(t, err)
return wal
}
func destroyWAL(wal *WAL) {
if wal != nil {
_ = wal.Close()
_ = os.RemoveAll(wal.options.DirPath)
}
}
func TestWAL_WriteALL(t *testing.T) {
wal := setupWAL(t, "wal-test-write-batch-1")
defer destroyWAL(wal)
testWriteAllIterate(t, wal, 0, 10)
assert.True(t, wal.IsEmpty())
testWriteAllIterate(t, wal, 10000, 512)
assert.False(t, wal.IsEmpty())
}
func TestWAL_Write(t *testing.T) {
wal := setupWAL(t, "wal-test-write1")
defer destroyWAL(wal)
pos1, err := wal.Write([]byte("hello1"))
assert.Nil(t, err)
assert.NotNil(t, pos1)
pos2, err := wal.Write([]byte("hello2"))
assert.Nil(t, err)
assert.NotNil(t, pos2)
pos3, err := wal.Write([]byte("hello3"))
assert.Nil(t, err)
assert.NotNil(t, pos3)
val, err := wal.Read(pos1)
assert.Nil(t, err)
assert.Equal(t, "hello1", string(val))
val, err = wal.Read(pos2)
assert.Nil(t, err)
assert.Equal(t, "hello2", string(val))
val, err = wal.Read(pos3)
assert.Nil(t, err)
assert.Equal(t, "hello3", string(val))
}
func TestWAL_Write_large(t *testing.T) {
wal := setupWAL(t, "wal-test-write2")
defer destroyWAL(wal)
testWriteAndIterate(t, wal, 100000, 512)
}
func TestWAL_Write_large2(t *testing.T) {
wal := setupWAL(t, "wal-test-write3")
defer destroyWAL(wal)
testWriteAndIterate(t, wal, 2000, 32*1024*3+10)
}
func TestWAL_Reader(t *testing.T) {
wal := setupWAL(t, "wal-test-wal-reader")
defer destroyWAL(wal)
var size = 100000
val := strings.Repeat("wal", 512)
for i := 0; i < size; i++ {
_, err := wal.Write([]byte(val))
assert.Nil(t, err)
}
validate := func(walInner *WAL, size int) {
var i = 0
reader := walInner.NewReader()
for {
chunk, position, err := reader.Next()
if err != nil {
if err == io.EOF {
break
}
panic(err)
}
assert.NotNil(t, chunk)
assert.NotNil(t, position)
assert.Equal(t, position.SegmentId, reader.CurrentSegmentId())
i++
}
assert.Equal(t, i, size)
}
validate(wal, size)
}