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refactor needle write for different versions

pull/6844/head
chrislu 1 week ago
parent
bed0a64693
commit
c4695fc3b3
6 changed files with 519 additions and 127 deletions
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  1. 136
      weed/storage/needle/needle_write.go
  2. 142
      weed/storage/needle/needle_write_legacy.go
  3. 95
      weed/storage/needle/needle_write_test.go
  4. 54
      weed/storage/needle/needle_write_v1.go
  5. 109
      weed/storage/needle/needle_write_v2.go
  6. 110
      weed/storage/needle/needle_write_v3.go

136
weed/storage/needle/needle_write.go
View File

@ -1,145 +1,27 @@
package needle
import (
"bytes"
"fmt"
"math"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/storage/backend"
. "github.com/seaweedfs/seaweedfs/weed/storage/types"
"github.com/seaweedfs/seaweedfs/weed/util"
"github.com/seaweedfs/seaweedfs/weed/util/buffer_pool"
)
func (n *Needle) prepareWriteBuffer(version Version, writeBytes *bytes.Buffer) (Size, int64, error) {
writeBytes.Reset()
switch version {
case Version1:
header := make([]byte, NeedleHeaderSize)
CookieToBytes(header[0:CookieSize], n.Cookie)
NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id)
n.Size = Size(len(n.Data))
SizeToBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
size := n.Size
actualSize := NeedleHeaderSize + int64(n.Size)
writeBytes.Write(header)
writeBytes.Write(n.Data)
padding := PaddingLength(n.Size, version)
util.Uint32toBytes(header[0:NeedleChecksumSize], uint32(n.Checksum))
writeBytes.Write(header[0 : NeedleChecksumSize+padding])
return size, actualSize, nil
case Version2, Version3:
header := make([]byte, NeedleHeaderSize+TimestampSize) // adding timestamp to reuse it and avoid extra allocation
CookieToBytes(header[0:CookieSize], n.Cookie)
NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id)
if len(n.Name) >= math.MaxUint8 {
n.NameSize = math.MaxUint8
} else {
n.NameSize = uint8(len(n.Name))
}
n.DataSize, n.MimeSize = uint32(len(n.Data)), uint8(len(n.Mime))
if n.DataSize > 0 {
n.Size = 4 + Size(n.DataSize) + 1
if n.HasName() {
n.Size = n.Size + 1 + Size(n.NameSize)
}
if n.HasMime() {
n.Size = n.Size + 1 + Size(n.MimeSize)
}
if n.HasLastModifiedDate() {
n.Size = n.Size + LastModifiedBytesLength
}
if n.HasTtl() {
n.Size = n.Size + TtlBytesLength
}
if n.HasPairs() {
n.Size += 2 + Size(n.PairsSize)
}
} else {
n.Size = 0
}
SizeToBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
writeBytes.Write(header[0:NeedleHeaderSize])
if n.DataSize > 0 {
util.Uint32toBytes(header[0:4], n.DataSize)
writeBytes.Write(header[0:4])
writeBytes.Write(n.Data)
util.Uint8toBytes(header[0:1], n.Flags)
writeBytes.Write(header[0:1])
if n.HasName() {
util.Uint8toBytes(header[0:1], n.NameSize)
writeBytes.Write(header[0:1])
writeBytes.Write(n.Name[:n.NameSize])
}
if n.HasMime() {
util.Uint8toBytes(header[0:1], n.MimeSize)
writeBytes.Write(header[0:1])
writeBytes.Write(n.Mime)
}
if n.HasLastModifiedDate() {
util.Uint64toBytes(header[0:8], n.LastModified)
writeBytes.Write(header[8-LastModifiedBytesLength : 8])
}
if n.HasTtl() && n.Ttl != nil {
n.Ttl.ToBytes(header[0:TtlBytesLength])
writeBytes.Write(header[0:TtlBytesLength])
}
if n.HasPairs() {
util.Uint16toBytes(header[0:2], n.PairsSize)
writeBytes.Write(header[0:2])
writeBytes.Write(n.Pairs)
}
}
padding := PaddingLength(n.Size, version)
util.Uint32toBytes(header[0:NeedleChecksumSize], uint32(n.Checksum))
if version == Version2 {
writeBytes.Write(header[0 : NeedleChecksumSize+padding])
} else {
// version3
util.Uint64toBytes(header[NeedleChecksumSize:NeedleChecksumSize+TimestampSize], n.AppendAtNs)
writeBytes.Write(header[0 : NeedleChecksumSize+TimestampSize+padding])
}
return Size(n.DataSize), GetActualSize(n.Size, version), nil
}
return 0, 0, fmt.Errorf("Unsupported Version! (%d)", version)
}
func (n *Needle) Append(w backend.BackendStorageFile, version Version) (offset uint64, size Size, actualSize int64, err error) {
if end, _, e := w.GetStat(); e == nil {
defer func(w backend.BackendStorageFile, off int64) {
if err != nil {
if te := w.Truncate(end); te != nil {
glog.V(0).Infof("Failed to truncate %s back to %d with error: %v", w.Name(), end, te)
}
}
}(w, end)
offset = uint64(end)
} else {
err = fmt.Errorf("Cannot Read Current Volume Position: %w", e)
return
}
if offset >= MaxPossibleVolumeSize && len(n.Data) != 0 {
err = fmt.Errorf("Volume Size %d Exceeded %d", offset, MaxPossibleVolumeSize)
switch version {
case Version1:
return writeNeedleV1(w, n)
case Version2:
return writeNeedleV2(w, n)
case Version3:
return writeNeedleV3(w, n)
default:
err = fmt.Errorf("unsupported version: %d", version)
return
}
bytesBuffer := buffer_pool.SyncPoolGetBuffer()
defer buffer_pool.SyncPoolPutBuffer(bytesBuffer)
size, actualSize, err = n.prepareWriteBuffer(version, bytesBuffer)
if err == nil {
_, err = w.WriteAt(bytesBuffer.Bytes(), int64(offset))
if err != nil {
err = fmt.Errorf("failed to write %d bytes to %s at offset %d: %w", actualSize, w.Name(), offset, err)
}
}
return offset, size, actualSize, err
}
func WriteNeedleBlob(w backend.BackendStorageFile, dataSlice []byte, size Size, appendAtNs uint64, version Version) (offset uint64, err error) {

142
weed/storage/needle/needle_write_legacy.go
View File

@ -0,0 +1,142 @@
package needle
import (
"bytes"
"fmt"
"math"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/storage/backend"
. "github.com/seaweedfs/seaweedfs/weed/storage/types"
"github.com/seaweedfs/seaweedfs/weed/util"
"github.com/seaweedfs/seaweedfs/weed/util/buffer_pool"
)
func (n *Needle) LegacyPrepareWriteBuffer(version Version, writeBytes *bytes.Buffer) (Size, int64, error) {
writeBytes.Reset()
switch version {
case Version1:
header := make([]byte, NeedleHeaderSize)
CookieToBytes(header[0:CookieSize], n.Cookie)
NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id)
n.Size = Size(len(n.Data))
SizeToBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
size := n.Size
actualSize := NeedleHeaderSize + int64(n.Size)
writeBytes.Write(header)
writeBytes.Write(n.Data)
padding := PaddingLength(n.Size, version)
util.Uint32toBytes(header[0:NeedleChecksumSize], uint32(n.Checksum))
writeBytes.Write(header[0 : NeedleChecksumSize+padding])
return size, actualSize, nil
case Version2, Version3:
header := make([]byte, NeedleHeaderSize+TimestampSize) // adding timestamp to reuse it and avoid extra allocation
CookieToBytes(header[0:CookieSize], n.Cookie)
NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id)
if len(n.Name) >= math.MaxUint8 {
n.NameSize = math.MaxUint8
} else {
n.NameSize = uint8(len(n.Name))
}
n.DataSize, n.MimeSize = uint32(len(n.Data)), uint8(len(n.Mime))
if n.DataSize > 0 {
n.Size = 4 + Size(n.DataSize) + 1
if n.HasName() {
n.Size = n.Size + 1 + Size(n.NameSize)
}
if n.HasMime() {
n.Size = n.Size + 1 + Size(n.MimeSize)
}
if n.HasLastModifiedDate() {
n.Size = n.Size + LastModifiedBytesLength
}
if n.HasTtl() {
n.Size = n.Size + TtlBytesLength
}
if n.HasPairs() {
n.Size += 2 + Size(n.PairsSize)
}
} else {
n.Size = 0
}
SizeToBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
writeBytes.Write(header[0:NeedleHeaderSize])
if n.DataSize > 0 {
util.Uint32toBytes(header[0:4], n.DataSize)
writeBytes.Write(header[0:4])
writeBytes.Write(n.Data)
util.Uint8toBytes(header[0:1], n.Flags)
writeBytes.Write(header[0:1])
if n.HasName() {
util.Uint8toBytes(header[0:1], n.NameSize)
writeBytes.Write(header[0:1])
writeBytes.Write(n.Name[:n.NameSize])
}
if n.HasMime() {
util.Uint8toBytes(header[0:1], n.MimeSize)
writeBytes.Write(header[0:1])
writeBytes.Write(n.Mime)
}
if n.HasLastModifiedDate() {
util.Uint64toBytes(header[0:8], n.LastModified)
writeBytes.Write(header[8-LastModifiedBytesLength : 8])
}
if n.HasTtl() && n.Ttl != nil {
n.Ttl.ToBytes(header[0:TtlBytesLength])
writeBytes.Write(header[0:TtlBytesLength])
}
if n.HasPairs() {
util.Uint16toBytes(header[0:2], n.PairsSize)
writeBytes.Write(header[0:2])
writeBytes.Write(n.Pairs)
}
}
padding := PaddingLength(n.Size, version)
util.Uint32toBytes(header[0:NeedleChecksumSize], uint32(n.Checksum))
if version == Version2 {
writeBytes.Write(header[0 : NeedleChecksumSize+padding])
} else {
// version3
util.Uint64toBytes(header[NeedleChecksumSize:NeedleChecksumSize+TimestampSize], n.AppendAtNs)
writeBytes.Write(header[0 : NeedleChecksumSize+TimestampSize+padding])
}
return Size(n.DataSize), GetActualSize(n.Size, version), nil
}
return 0, 0, fmt.Errorf("Unsupported Version! (%d)", version)
}
func (n *Needle) LegacyAppend(w backend.BackendStorageFile, version Version) (offset uint64, size Size, actualSize int64, err error) {
if end, _, e := w.GetStat(); e == nil {
defer func(w backend.BackendStorageFile, off int64) {
if err != nil {
if te := w.Truncate(end); te != nil {
glog.V(0).Infof("Failed to truncate %s back to %d with error: %v", w.Name(), end, te)
}
}
}(w, end)
offset = uint64(end)
} else {
err = fmt.Errorf("Cannot Read Current Volume Position: %w", e)
return
}
if offset >= MaxPossibleVolumeSize && len(n.Data) != 0 {
err = fmt.Errorf("Volume Size %d Exceeded %d", offset, MaxPossibleVolumeSize)
return
}
bytesBuffer := buffer_pool.SyncPoolGetBuffer()
defer buffer_pool.SyncPoolPutBuffer(bytesBuffer)
size, actualSize, err = n.LegacyPrepareWriteBuffer(version, bytesBuffer)
if err == nil {
_, err = w.WriteAt(bytesBuffer.Bytes(), int64(offset))
if err != nil {
err = fmt.Errorf("failed to write %d bytes to %s at offset %d: %w", actualSize, w.Name(), offset, err)
}
}
return offset, size, actualSize, err
}

95
weed/storage/needle/needle_write_test.go
View File

@ -1,8 +1,10 @@
package needle
import (
"bytes"
"os"
"testing"
"time"
"github.com/seaweedfs/seaweedfs/weed/storage/backend"
"github.com/seaweedfs/seaweedfs/weed/storage/types"
@ -62,3 +64,96 @@ func TestAppend(t *testing.T) {
t.Errorf("Fail to Append Needle.")
}
}
func versionString(v Version) string {
switch v {
case Version1:
return "Version1"
case Version2:
return "Version2"
case Version3:
return "Version3"
default:
return "UnknownVersion"
}
}
func TestWriteNeedle_CompatibilityWithLegacy(t *testing.T) {
versions := []Version{Version1, Version2, Version3}
for _, version := range versions {
t.Run(versionString(version), func(t *testing.T) {
n := &Needle{
Cookie: 0x12345678,
Id: 0x1122334455667788,
Data: []byte("hello world"),
Flags: 0xFF,
Name: []byte("filename.txt"),
Mime: []byte("text/plain"),
LastModified: 0x1234567890,
Ttl: nil, // Add TTL if needed
Pairs: []byte("key=value"),
PairsSize: 9,
Checksum: 0xCAFEBABE,
AppendAtNs: 0xDEADBEEF,
}
// Legacy
legacyBuf := &bytes.Buffer{}
_, _, err := n.LegacyPrepareWriteBuffer(version, legacyBuf)
if err != nil {
t.Fatalf("LegacyPrepareWriteBuffer failed: %v", err)
}
// New
newBuf := &bytes.Buffer{}
switch version {
case Version1:
_, _, _, err = writeNeedleV1(&mockBackendWriter{buf: newBuf}, n)
case Version2:
_, _, _, err = writeNeedleV2(&mockBackendWriter{buf: newBuf}, n)
case Version3:
_, _, _, err = writeNeedleV3(&mockBackendWriter{buf: newBuf}, n)
}
if err != nil {
t.Fatalf("writeNeedleV%d failed: %v", version, err)
}
if !bytes.Equal(legacyBuf.Bytes(), newBuf.Bytes()) {
t.Errorf("Data layout mismatch for version %d\nLegacy: %x\nNew: %x", version, legacyBuf.Bytes(), newBuf.Bytes())
}
})
}
}
type mockBackendWriter struct {
buf *bytes.Buffer
}
func (m *mockBackendWriter) WriteAt(p []byte, off int64) (n int, err error) {
return m.buf.Write(p)
}
func (m *mockBackendWriter) GetStat() (int64, time.Time, error) {
return 0, time.Time{}, nil
}
func (m *mockBackendWriter) Truncate(size int64) error {
return nil
}
func (m *mockBackendWriter) Name() string {
return "mock"
}
func (m *mockBackendWriter) Close() error {
return nil
}
func (m *mockBackendWriter) Sync() error {
return nil
}
func (m *mockBackendWriter) ReadAt(p []byte, off int64) (n int, err error) {
// Not used in this test
return 0, nil
}

54
weed/storage/needle/needle_write_v1.go
View File

@ -0,0 +1,54 @@
package needle
import (
"fmt"
"github.com/seaweedfs/seaweedfs/weed/storage/backend"
. "github.com/seaweedfs/seaweedfs/weed/storage/types"
"github.com/seaweedfs/seaweedfs/weed/util"
"github.com/seaweedfs/seaweedfs/weed/util/buffer_pool"
)
func writeNeedleV1(w backend.BackendStorageFile, n *Needle) (offset uint64, size Size, actualSize int64, err error) {
if end, _, e := w.GetStat(); e == nil {
defer func(w backend.BackendStorageFile, off int64) {
if err != nil {
if te := w.Truncate(end); te != nil {
// handle error
}
}
}(w, end)
offset = uint64(end)
} else {
err = fmt.Errorf("Cannot Read Current Volume Position: %w", e)
return
}
if offset >= MaxPossibleVolumeSize && len(n.Data) != 0 {
err = fmt.Errorf("Volume Size %d Exceeded %d", offset, MaxPossibleVolumeSize)
return
}
bytesBuffer := buffer_pool.SyncPoolGetBuffer()
defer buffer_pool.SyncPoolPutBuffer(bytesBuffer)
bytesBuffer.Reset()
header := make([]byte, NeedleHeaderSize)
CookieToBytes(header[0:CookieSize], n.Cookie)
NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id)
n.Size = Size(len(n.Data))
SizeToBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
size = n.Size
actualSize = NeedleHeaderSize + int64(n.Size)
bytesBuffer.Write(header)
bytesBuffer.Write(n.Data)
padding := PaddingLength(n.Size, Version1)
util.Uint32toBytes(header[0:NeedleChecksumSize], uint32(n.Checksum))
bytesBuffer.Write(header[0 : NeedleChecksumSize+padding])
_, err = w.WriteAt(bytesBuffer.Bytes(), int64(offset))
if err != nil {
err = fmt.Errorf("failed to write %d bytes to %s at offset %d: %w", actualSize, w.Name(), offset, err)
}
return offset, size, actualSize, err
}

109
weed/storage/needle/needle_write_v2.go
View File

@ -0,0 +1,109 @@
package needle
import (
"fmt"
"math"
"github.com/seaweedfs/seaweedfs/weed/storage/backend"
. "github.com/seaweedfs/seaweedfs/weed/storage/types"
"github.com/seaweedfs/seaweedfs/weed/util"
"github.com/seaweedfs/seaweedfs/weed/util/buffer_pool"
)
func writeNeedleV2(w backend.BackendStorageFile, n *Needle) (offset uint64, size Size, actualSize int64, err error) {
if end, _, e := w.GetStat(); e == nil {
defer func(w backend.BackendStorageFile, off int64) {
if err != nil {
if te := w.Truncate(end); te != nil {
// handle error
}
}
}(w, end)
offset = uint64(end)
} else {
err = fmt.Errorf("Cannot Read Current Volume Position: %w", e)
return
}
if offset >= MaxPossibleVolumeSize && len(n.Data) != 0 {
err = fmt.Errorf("Volume Size %d Exceeded %d", offset, MaxPossibleVolumeSize)
return
}
bytesBuffer := buffer_pool.SyncPoolGetBuffer()
defer buffer_pool.SyncPoolPutBuffer(bytesBuffer)
bytesBuffer.Reset()
header := make([]byte, NeedleHeaderSize+TimestampSize)
CookieToBytes(header[0:CookieSize], n.Cookie)
NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id)
if len(n.Name) >= math.MaxUint8 {
n.NameSize = math.MaxUint8
} else {
n.NameSize = uint8(len(n.Name))
}
n.DataSize, n.MimeSize = uint32(len(n.Data)), uint8(len(n.Mime))
if n.DataSize > 0 {
n.Size = 4 + Size(n.DataSize) + 1
if n.HasName() {
n.Size = n.Size + 1 + Size(n.NameSize)
}
if n.HasMime() {
n.Size = n.Size + 1 + Size(n.MimeSize)
}
if n.HasLastModifiedDate() {
n.Size = n.Size + LastModifiedBytesLength
}
if n.HasTtl() {
n.Size = n.Size + TtlBytesLength
}
if n.HasPairs() {
n.Size += 2 + Size(n.PairsSize)
}
} else {
n.Size = 0
}
SizeToBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
bytesBuffer.Write(header[0:NeedleHeaderSize])
if n.DataSize > 0 {
util.Uint32toBytes(header[0:4], n.DataSize)
bytesBuffer.Write(header[0:4])
bytesBuffer.Write(n.Data)
util.Uint8toBytes(header[0:1], n.Flags)
bytesBuffer.Write(header[0:1])
if n.HasName() {
util.Uint8toBytes(header[0:1], n.NameSize)
bytesBuffer.Write(header[0:1])
bytesBuffer.Write(n.Name[:n.NameSize])
}
if n.HasMime() {
util.Uint8toBytes(header[0:1], n.MimeSize)
bytesBuffer.Write(header[0:1])
bytesBuffer.Write(n.Mime)
}
if n.HasLastModifiedDate() {
util.Uint64toBytes(header[0:8], n.LastModified)
bytesBuffer.Write(header[8-LastModifiedBytesLength : 8])
}
if n.HasTtl() && n.Ttl != nil {
n.Ttl.ToBytes(header[0:TtlBytesLength])
bytesBuffer.Write(header[0:TtlBytesLength])
}
if n.HasPairs() {
util.Uint16toBytes(header[0:2], n.PairsSize)
bytesBuffer.Write(header[0:2])
bytesBuffer.Write(n.Pairs)
}
}
padding := PaddingLength(n.Size, Version2)
util.Uint32toBytes(header[0:NeedleChecksumSize], uint32(n.Checksum))
bytesBuffer.Write(header[0 : NeedleChecksumSize+padding])
size = Size(n.DataSize)
actualSize = GetActualSize(n.Size, Version2)
_, err = w.WriteAt(bytesBuffer.Bytes(), int64(offset))
if err != nil {
err = fmt.Errorf("failed to write %d bytes to %s at offset %d: %w", actualSize, w.Name(), offset, err)
}
return offset, size, actualSize, err
}

110
weed/storage/needle/needle_write_v3.go
View File

@ -0,0 +1,110 @@
package needle
import (
"fmt"
"math"
"github.com/seaweedfs/seaweedfs/weed/storage/backend"
. "github.com/seaweedfs/seaweedfs/weed/storage/types"
"github.com/seaweedfs/seaweedfs/weed/util"
"github.com/seaweedfs/seaweedfs/weed/util/buffer_pool"
)
func writeNeedleV3(w backend.BackendStorageFile, n *Needle) (offset uint64, size Size, actualSize int64, err error) {
if end, _, e := w.GetStat(); e == nil {
defer func(w backend.BackendStorageFile, off int64) {
if err != nil {
if te := w.Truncate(end); te != nil {
// handle error
}
}
}(w, end)
offset = uint64(end)
} else {
err = fmt.Errorf("Cannot Read Current Volume Position: %w", e)
return
}
if offset >= MaxPossibleVolumeSize && len(n.Data) != 0 {
err = fmt.Errorf("Volume Size %d Exceeded %d", offset, MaxPossibleVolumeSize)
return
}
bytesBuffer := buffer_pool.SyncPoolGetBuffer()
defer buffer_pool.SyncPoolPutBuffer(bytesBuffer)
bytesBuffer.Reset()
header := make([]byte, NeedleHeaderSize+TimestampSize)
CookieToBytes(header[0:CookieSize], n.Cookie)
NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id)
if len(n.Name) >= math.MaxUint8 {
n.NameSize = math.MaxUint8
} else {
n.NameSize = uint8(len(n.Name))
}
n.DataSize, n.MimeSize = uint32(len(n.Data)), uint8(len(n.Mime))
if n.DataSize > 0 {
n.Size = 4 + Size(n.DataSize) + 1
if n.HasName() {
n.Size = n.Size + 1 + Size(n.NameSize)
}
if n.HasMime() {
n.Size = n.Size + 1 + Size(n.MimeSize)
}
if n.HasLastModifiedDate() {
n.Size = n.Size + LastModifiedBytesLength
}
if n.HasTtl() {
n.Size = n.Size + TtlBytesLength
}
if n.HasPairs() {
n.Size += 2 + Size(n.PairsSize)
}
} else {
n.Size = 0
}
SizeToBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
bytesBuffer.Write(header[0:NeedleHeaderSize])
if n.DataSize > 0 {
util.Uint32toBytes(header[0:4], n.DataSize)
bytesBuffer.Write(header[0:4])
bytesBuffer.Write(n.Data)
util.Uint8toBytes(header[0:1], n.Flags)
bytesBuffer.Write(header[0:1])
if n.HasName() {
util.Uint8toBytes(header[0:1], n.NameSize)
bytesBuffer.Write(header[0:1])
bytesBuffer.Write(n.Name[:n.NameSize])
}
if n.HasMime() {
util.Uint8toBytes(header[0:1], n.MimeSize)
bytesBuffer.Write(header[0:1])
bytesBuffer.Write(n.Mime)
}
if n.HasLastModifiedDate() {
util.Uint64toBytes(header[0:8], n.LastModified)
bytesBuffer.Write(header[8-LastModifiedBytesLength : 8])
}
if n.HasTtl() && n.Ttl != nil {
n.Ttl.ToBytes(header[0:TtlBytesLength])
bytesBuffer.Write(header[0:TtlBytesLength])
}
if n.HasPairs() {
util.Uint16toBytes(header[0:2], n.PairsSize)
bytesBuffer.Write(header[0:2])
bytesBuffer.Write(n.Pairs)
}
}
padding := PaddingLength(n.Size, Version3)
util.Uint32toBytes(header[0:NeedleChecksumSize], uint32(n.Checksum))
util.Uint64toBytes(header[NeedleChecksumSize:NeedleChecksumSize+TimestampSize], n.AppendAtNs)
bytesBuffer.Write(header[0 : NeedleChecksumSize+TimestampSize+padding])
size = Size(n.DataSize)
actualSize = GetActualSize(n.Size, Version3)
_, err = w.WriteAt(bytesBuffer.Bytes(), int64(offset))
if err != nil {
err = fmt.Errorf("failed to write %d bytes to %s at offset %d: %w", actualSize, w.Name(), offset, err)
}
return offset, size, actualSize, err
}
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