优化缓存管理

2025-11-03 23:20:25 +08:00 · 2021-01-13 12:02:50 +08:00
parent 0e51e1c7cb
commit ba6fa92dc9
22 changed files with 1517 additions and 548 deletions
--- a/internal/caches/item.go
+++ b/internal/caches/item.go
@@ -3,12 +3,21 @@ package caches
 import "time"

 type Item struct {
-	Key       string
-	ExpiredAt int64
-	ValueSize int64
-	Size      int64
+	Key        string
+	ExpiredAt  int64
+	HeaderSize int64
+	BodySize   int64
+	MetaSize   int64
 }

 func (this *Item) IsExpired() bool {
 	return this.ExpiredAt < time.Now().Unix()
 }
+
+func (this *Item) TotalSize() int64 {
+	return this.Size() + this.MetaSize + int64(len(this.Key))
+}
+
+func (this *Item) Size() int64 {
+	return this.HeaderSize + this.BodySize
+}
--- a/internal/caches/list.go
+++ b/internal/caches/list.go
@@ -118,8 +118,8 @@ func (this *List) Stat(check func(hash string) bool) *Stat {
 			// 检查文件是否存在、内容是否正确等
 			if check != nil && check(hash) {
 				result.Count++
-				result.ValueSize += item.ValueSize
-				result.Size += item.Size
+				result.ValueSize += item.Size()
+				result.Size += item.TotalSize()
 			}
 		}
 	}
--- a/internal/caches/list_test.go
+++ b/internal/caches/list_test.go
@@ -12,14 +12,14 @@ import (
 func TestList_Add(t *testing.T) {
 	list := NewList()
 	list.Add("a", &Item{
-		Key:       "a1",
-		ExpiredAt: time.Now().Unix() + 3600,
-		Size:      1024,
+		Key:        "a1",
+		ExpiredAt:  time.Now().Unix() + 3600,
+		HeaderSize: 1024,
 	})
 	list.Add("b", &Item{
-		Key:       "b1",
-		ExpiredAt: time.Now().Unix() + 3600,
-		Size:      1024,
+		Key:        "b1",
+		ExpiredAt:  time.Now().Unix() + 3600,
+		HeaderSize: 1024,
 	})
 	t.Log(list.m)
 }
@@ -27,14 +27,14 @@ func TestList_Add(t *testing.T) {
 func TestList_Remove(t *testing.T) {
 	list := NewList()
 	list.Add("a", &Item{
-		Key:       "a1",
-		ExpiredAt: time.Now().Unix() + 3600,
-		Size:      1024,
+		Key:        "a1",
+		ExpiredAt:  time.Now().Unix() + 3600,
+		HeaderSize: 1024,
 	})
 	list.Add("b", &Item{
-		Key:       "b1",
-		ExpiredAt: time.Now().Unix() + 3600,
-		Size:      1024,
+		Key:        "b1",
+		ExpiredAt:  time.Now().Unix() + 3600,
+		HeaderSize: 1024,
 	})
 	list.Remove("b")
 	t.Log(list.m)
@@ -43,24 +43,24 @@ func TestList_Remove(t *testing.T) {
 func TestList_Purge(t *testing.T) {
 	list := NewList()
 	list.Add("a", &Item{
-		Key:       "a1",
-		ExpiredAt: time.Now().Unix() + 3600,
-		Size:      1024,
+		Key:        "a1",
+		ExpiredAt:  time.Now().Unix() + 3600,
+		HeaderSize: 1024,
 	})
 	list.Add("b", &Item{
-		Key:       "b1",
-		ExpiredAt: time.Now().Unix() + 3600,
-		Size:      1024,
+		Key:        "b1",
+		ExpiredAt:  time.Now().Unix() + 3600,
+		HeaderSize: 1024,
 	})
 	list.Add("c", &Item{
-		Key:       "c1",
-		ExpiredAt: time.Now().Unix() - 3600,
-		Size:      1024,
+		Key:        "c1",
+		ExpiredAt:  time.Now().Unix() - 3600,
+		HeaderSize: 1024,
 	})
 	list.Add("d", &Item{
-		Key:       "d1",
-		ExpiredAt: time.Now().Unix() - 2,
-		Size:      1024,
+		Key:        "d1",
+		ExpiredAt:  time.Now().Unix() - 2,
+		HeaderSize: 1024,
 	})
 	list.Purge(100, func(hash string) {
 		t.Log("delete:", hash)
@@ -71,24 +71,24 @@ func TestList_Purge(t *testing.T) {
 func TestList_Stat(t *testing.T) {
 	list := NewList()
 	list.Add("a", &Item{
-		Key:       "a1",
-		ExpiredAt: time.Now().Unix() + 3600,
-		Size:      1024,
+		Key:        "a1",
+		ExpiredAt:  time.Now().Unix() + 3600,
+		HeaderSize: 1024,
 	})
 	list.Add("b", &Item{
-		Key:       "b1",
-		ExpiredAt: time.Now().Unix() + 3600,
-		Size:      1024,
+		Key:        "b1",
+		ExpiredAt:  time.Now().Unix() + 3600,
+		HeaderSize: 1024,
 	})
 	list.Add("c", &Item{
-		Key:       "c1",
-		ExpiredAt: time.Now().Unix(),
-		Size:      1024,
+		Key:        "c1",
+		ExpiredAt:  time.Now().Unix(),
+		HeaderSize: 1024,
 	})
 	list.Add("d", &Item{
-		Key:       "d1",
-		ExpiredAt: time.Now().Unix() - 2,
-		Size:      1024,
+		Key:        "d1",
+		ExpiredAt:  time.Now().Unix() - 2,
+		HeaderSize: 1024,
 	})
 	result := list.Stat(func(hash string) bool {
 		// 随机测试
@@ -104,10 +104,10 @@ func TestList_FindKeysWithPrefix(t *testing.T) {
 	for i := 0; i < 1_000_000; i++ {
 		key := "http://www.teaos.cn/hello" + strconv.Itoa(i/100000) + "/" + strconv.Itoa(i) + ".html"
 		list.Add(fmt.Sprintf("%d", xxhash.Sum64String(key)), &Item{
-			Key:       key,
-			ExpiredAt: 0,
-			ValueSize: 0,
-			Size:      0,
+			Key:        key,
+			ExpiredAt:  0,
+			BodySize:   0,
+			HeaderSize: 0,
 		})
 	}
 	t.Log(time.Since(before).Seconds()*1000, "ms")
--- a/internal/caches/reader.go
+++ b/internal/caches/reader.go
@@ -0,0 +1,29 @@
+package caches
+
+type ReaderFunc func(n int) (goNext bool, err error)
+
+type Reader interface {
+	// 初始化
+	Init() error
+
+	// 状态码
+	Status() int
+
+	// 读取Header
+	ReadHeader(buf []byte, callback ReaderFunc) error
+
+	// 读取Body
+	ReadBody(buf []byte, callback ReaderFunc) error
+
+	// 读取某个范围内的Body
+	ReadBodyRange(buf []byte, start int64, end int64, callback ReaderFunc) error
+
+	// Header Size
+	HeaderSize() int64
+
+	// Body Size
+	BodySize() int64
+
+	// 关闭
+	Close() error
+}
--- a/internal/caches/reader_file.go
+++ b/internal/caches/reader_file.go
@@ -0,0 +1,291 @@
+package caches
+
+import (
+	"encoding/binary"
+	"errors"
+	"github.com/iwind/TeaGo/types"
+	"io"
+	"os"
+)
+
+type FileReader struct {
+	fp *os.File
+
+	status       int
+	headerOffset int64
+	headerSize   int
+	bodySize     int64
+	bodyOffset   int64
+}
+
+func NewFileReader(fp *os.File) *FileReader {
+	return &FileReader{fp: fp}
+}
+
+func (this *FileReader) Init() error {
+	isOk := false
+
+	defer func() {
+		if !isOk {
+			_ = this.discard()
+		}
+	}()
+
+	// 读取状态
+	_, err := this.fp.Seek(SizeExpiresAt, io.SeekStart)
+	if err != nil {
+		_ = this.discard()
+		return err
+	}
+	buf := make([]byte, 3)
+	ok, err := this.readToBuff(this.fp, buf)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return ErrNotFound
+	}
+	status := types.Int(string(buf))
+	if status < 100 || status > 999 {
+		return errors.New("invalid status")
+	}
+	this.status = status
+
+	// URL
+	_, err = this.fp.Seek(SizeExpiresAt+SizeStatus, io.SeekStart)
+	if err != nil {
+		return err
+	}
+
+	bytes4 := make([]byte, 4)
+	ok, err = this.readToBuff(this.fp, bytes4)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return ErrNotFound
+	}
+	urlLength := binary.BigEndian.Uint32(bytes4)
+
+	// header
+	ok, err = this.readToBuff(this.fp, bytes4)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return ErrNotFound
+	}
+	headerSize := int(binary.BigEndian.Uint32(bytes4))
+	if headerSize == 0 {
+		return nil
+	}
+	this.headerSize = headerSize
+	this.headerOffset = int64(SizeMeta) + int64(urlLength)
+
+	// body
+	bytes8 := make([]byte, 8)
+	ok, err = this.readToBuff(this.fp, bytes8)
+	if err != nil {
+		return err
+	}
+	if !ok {
+		return ErrNotFound
+	}
+	bodySize := int(binary.BigEndian.Uint64(bytes8))
+	if bodySize == 0 {
+		return nil
+	}
+	this.bodySize = int64(bodySize)
+	this.bodyOffset = this.headerOffset + int64(headerSize)
+
+	isOk = true
+
+	return nil
+}
+
+func (this *FileReader) Status() int {
+	return this.status
+}
+
+func (this *FileReader) HeaderSize() int64 {
+	return int64(this.headerSize)
+}
+
+func (this *FileReader) BodySize() int64 {
+	return this.bodySize
+}
+
+func (this *FileReader) ReadHeader(buf []byte, callback ReaderFunc) error {
+	isOk := false
+
+	defer func() {
+		if !isOk {
+			_ = this.discard()
+		}
+	}()
+
+	_, err := this.fp.Seek(this.headerOffset, io.SeekStart)
+	if err != nil {
+		return err
+	}
+
+	for {
+		n, err := this.fp.Read(buf)
+		if n > 0 {
+			if n < this.headerSize {
+				goNext, e := callback(n)
+				if e != nil {
+					isOk = true
+					return e
+				}
+				if !goNext {
+					break
+				}
+				this.headerSize -= n
+			} else {
+				_, e := callback(this.headerSize)
+				if e != nil {
+					isOk = true
+					return e
+				}
+				break
+			}
+		}
+		if err != nil {
+			if err != io.EOF {
+				return err
+			}
+			break
+		}
+	}
+
+	isOk = true
+
+	return nil
+}
+
+func (this *FileReader) ReadBody(buf []byte, callback ReaderFunc) error {
+	isOk := false
+
+	defer func() {
+		if !isOk {
+			_ = this.discard()
+		}
+	}()
+
+	_, err := this.fp.Seek(this.bodyOffset, io.SeekStart)
+	if err != nil {
+		return err
+	}
+
+	for {
+		n, err := this.fp.Read(buf)
+		if n > 0 {
+			goNext, e := callback(n)
+			if e != nil {
+				isOk = true
+				return e
+			}
+			if !goNext {
+				break
+			}
+		}
+		if err != nil {
+			if err != io.EOF {
+				return err
+			}
+			break
+		}
+	}
+
+	isOk = true
+
+	return nil
+}
+
+func (this *FileReader) ReadBodyRange(buf []byte, start int64, end int64, callback ReaderFunc) error {
+	isOk := false
+
+	defer func() {
+		if !isOk {
+			_ = this.discard()
+		}
+	}()
+
+	offset := start
+	if start < 0 {
+		offset = this.bodyOffset + this.bodySize + end
+		end = this.bodyOffset + this.bodySize - 1
+	} else if end < 0 {
+		offset = this.bodyOffset + start
+		end = this.bodyOffset + this.bodySize - 1
+	} else {
+		offset = this.bodyOffset + start
+		end = this.bodyOffset + end
+	}
+	if offset < 0 || end < 0 || offset > end {
+		isOk = true
+		return ErrInvalidRange
+	}
+	_, err := this.fp.Seek(offset, io.SeekStart)
+	if err != nil {
+		return err
+	}
+
+	for {
+		n, err := this.fp.Read(buf)
+		if n > 0 {
+			n2 := int(end-offset) + 1
+			if n2 <= n {
+				_, e := callback(n2)
+				if e != nil {
+					isOk = true
+					return e
+				}
+				break
+			} else {
+				goNext, e := callback(n)
+				if e != nil {
+					isOk = true
+					return e
+				}
+				if !goNext {
+					break
+				}
+			}
+
+			offset += int64(n)
+			if offset > end {
+				break
+			}
+		}
+		if err != nil {
+			if err != io.EOF {
+				return err
+			}
+			break
+		}
+	}
+
+	isOk = true
+
+	return nil
+}
+
+func (this *FileReader) Close() error {
+	return this.fp.Close()
+}
+
+func (this *FileReader) readToBuff(fp *os.File, buf []byte) (ok bool, err error) {
+	n, err := fp.Read(buf)
+	if err != nil {
+		return false, err
+	}
+	ok = n == len(buf)
+	return
+}
+
+func (this *FileReader) discard() error {
+	_ = this.fp.Close()
+	return os.Remove(this.fp.Name())
+}
--- a/internal/caches/reader_file_test.go
+++ b/internal/caches/reader_file_test.go
@@ -0,0 +1,151 @@
+package caches
+
+import (
+	"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs"
+	"github.com/iwind/TeaGo/Tea"
+	"os"
+	"testing"
+)
+
+func TestFileReader(t *testing.T) {
+	storage := NewFileStorage(&serverconfigs.HTTPCachePolicy{
+		Id:   1,
+		IsOn: true,
+		Options: map[string]interface{}{
+			"dir": Tea.Root + "/caches",
+		},
+	})
+	err := storage.Init()
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, path := storage.keyPath("my-key")
+
+	fp, err := os.Open(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() {
+		_ = fp.Close()
+	}()
+	reader := NewFileReader(fp)
+	err = reader.Init()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Log(reader.Status())
+
+	buf := make([]byte, 10)
+	err = reader.ReadHeader(buf, func(n int) (goNext bool, err error) {
+		t.Log("header:", string(buf[:n]))
+		return true, nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = reader.ReadBody(buf, func(n int) (goNext bool, err error) {
+		t.Log("body:", string(buf[:n]))
+		return true, nil
+	})
+}
+
+func TestFileReader_Range(t *testing.T) {
+	storage := NewFileStorage(&serverconfigs.HTTPCachePolicy{
+		Id:   1,
+		IsOn: true,
+		Options: map[string]interface{}{
+			"dir": Tea.Root + "/caches",
+		},
+	})
+	err := storage.Init()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	/**writer, err := storage.Open("my-number", time.Now().Unix()+30*86400, 200, 6, 10)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = writer.Write([]byte("Header"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = writer.Write([]byte("0123456789"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = writer.Close()**/
+
+	_, path := storage.keyPath("my-number")
+
+	fp, err := os.Open(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() {
+		_ = fp.Close()
+	}()
+	reader := NewFileReader(fp)
+	err = reader.Init()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	buf := make([]byte, 6)
+	{
+		err = reader.ReadBodyRange(buf, 0, 0, func(n int) (goNext bool, err error) {
+			t.Log("[0, 0]", "body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	{
+		err = reader.ReadBodyRange(buf, 7, 7, func(n int) (goNext bool, err error) {
+			t.Log("[7, 7]", "body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	{
+		err = reader.ReadBodyRange(buf, 0, 10, func(n int) (goNext bool, err error) {
+			t.Log("[0, 10]", "body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	{
+		err = reader.ReadBodyRange(buf, 3, 5, func(n int) (goNext bool, err error) {
+			t.Log("[3, 5]", "body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	{
+		err = reader.ReadBodyRange(buf, -1, -3, func(n int) (goNext bool, err error) {
+			t.Log("[, -3]", "body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	{
+		err = reader.ReadBodyRange(buf, 3, -1, func(n int) (goNext bool, err error) {
+			t.Log("[3, ]", "body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+}
--- a/internal/caches/reader_memory.go
+++ b/internal/caches/reader_memory.go
@@ -0,0 +1,160 @@
+package caches
+
+import (
+	"errors"
+)
+
+type MemoryReader struct {
+	item *MemoryItem
+}
+
+func NewMemoryReader(item *MemoryItem) *MemoryReader {
+	return &MemoryReader{item: item}
+}
+
+func (this *MemoryReader) Init() error {
+	return nil
+}
+
+func (this *MemoryReader) Status() int {
+	return this.item.Status
+}
+
+func (this *MemoryReader) HeaderSize() int64 {
+	return int64(len(this.item.HeaderValue))
+}
+
+func (this *MemoryReader) BodySize() int64 {
+	return int64(len(this.item.BodyValue))
+}
+
+func (this *MemoryReader) ReadHeader(buf []byte, callback ReaderFunc) error {
+	l := len(buf)
+	if l == 0 {
+		return errors.New("using empty buffer")
+	}
+
+	size := len(this.item.HeaderValue)
+	offset := 0
+	for {
+		left := size - offset
+		if l <= left {
+			copy(buf, this.item.HeaderValue[offset:offset+l])
+			goNext, e := callback(l)
+			if e != nil {
+				return e
+			}
+			if !goNext {
+				break
+			}
+		} else {
+			copy(buf, this.item.HeaderValue[offset:])
+			_, e := callback(left)
+			if e != nil {
+				return e
+			}
+			break
+		}
+		offset += l
+		if offset >= size {
+			break
+		}
+	}
+
+	return nil
+}
+
+func (this *MemoryReader) ReadBody(buf []byte, callback ReaderFunc) error {
+	l := len(buf)
+	if l == 0 {
+		return errors.New("using empty buffer")
+	}
+
+	size := len(this.item.BodyValue)
+	offset := 0
+	for {
+		left := size - offset
+		if l <= left {
+			copy(buf, this.item.BodyValue[offset:offset+l])
+			goNext, e := callback(l)
+			if e != nil {
+				return e
+			}
+			if !goNext {
+				break
+			}
+		} else {
+			copy(buf, this.item.BodyValue[offset:])
+			_, e := callback(left)
+			if e != nil {
+				return e
+			}
+			break
+		}
+		offset += l
+		if offset >= size {
+			break
+		}
+	}
+	return nil
+}
+
+func (this *MemoryReader) ReadBodyRange(buf []byte, start int64, end int64, callback ReaderFunc) error {
+	offset := start
+	bodySize := int64(len(this.item.BodyValue))
+	if start < 0 {
+		offset = bodySize + end
+		end = bodySize - 1
+	} else if end < 0 {
+		offset = start
+		end = bodySize - 1
+	}
+
+	if end >= bodySize {
+		end = bodySize - 1
+	}
+
+	if offset < 0 || end < 0 || offset > end {
+		return ErrInvalidRange
+	}
+
+	newData := this.item.BodyValue[offset : end+1]
+
+	l := len(buf)
+	if l == 0 {
+		return errors.New("using empty buffer")
+	}
+
+	size := len(newData)
+	offset2 := 0
+	for {
+		left := size - offset2
+		if l <= left {
+			copy(buf, newData[offset2:offset2+l])
+			goNext, e := callback(l)
+			if e != nil {
+				return e
+			}
+			if !goNext {
+				break
+			}
+		} else {
+			copy(buf, newData[offset2:])
+			_, e := callback(left)
+			if e != nil {
+				return e
+			}
+			break
+		}
+		offset2 += l
+		if offset2 >= size {
+			break
+		}
+	}
+
+	return nil
+}
+
+func (this *MemoryReader) Close() error {
+	return nil
+}
--- a/internal/caches/reader_memory_test.go
+++ b/internal/caches/reader_memory_test.go
@@ -0,0 +1,105 @@
+package caches
+
+import "testing"
+
+func TestMemoryReader_Header(t *testing.T) {
+	item := &MemoryItem{
+		ExpiredAt:   0,
+		HeaderValue: []byte("0123456789"),
+		BodyValue:   nil,
+		Status:      2000,
+	}
+	reader := NewMemoryReader(item)
+	buf := make([]byte, 6)
+	err := reader.ReadHeader(buf, func(n int) (goNext bool, err error) {
+		t.Log("buf:", string(buf[:n]))
+		return true, nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestMemoryReader_Body(t *testing.T) {
+	item := &MemoryItem{
+		ExpiredAt:   0,
+		HeaderValue: nil,
+		BodyValue:   []byte("0123456789"),
+		Status:      2000,
+	}
+	reader := NewMemoryReader(item)
+	buf := make([]byte, 6)
+	err := reader.ReadBody(buf, func(n int) (goNext bool, err error) {
+		t.Log("buf:", string(buf[:n]))
+		return true, nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestMemoryReader_Body_Range(t *testing.T) {
+	item := &MemoryItem{
+		ExpiredAt:   0,
+		HeaderValue: nil,
+		BodyValue:   []byte("0123456789"),
+		Status:      2000,
+	}
+	reader := NewMemoryReader(item)
+	buf := make([]byte, 6)
+	var err error
+	{
+		err = reader.ReadBodyRange(buf, 0, 0, func(n int) (goNext bool, err error) {
+			t.Log("[0, 0]", "body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	{
+		err = reader.ReadBodyRange(buf, 7, 7, func(n int) (goNext bool, err error) {
+			t.Log("[7, 7]", "body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	{
+		err = reader.ReadBodyRange(buf, 0, 10, func(n int) (goNext bool, err error) {
+			t.Log("[0, 10]", "body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	{
+		err = reader.ReadBodyRange(buf, 3, 5, func(n int) (goNext bool, err error) {
+			t.Log("[3, 5]", "body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	{
+		err = reader.ReadBodyRange(buf, -1, -3, func(n int) (goNext bool, err error) {
+			t.Log("[, -3]", "body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	{
+		err = reader.ReadBodyRange(buf, 3, -1, func(n int) (goNext bool, err error) {
+			t.Log("[3, ]", "body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+}
--- a/internal/caches/storage_file.go
+++ b/internal/caches/storage_file.go
@@ -10,7 +10,6 @@ import (
 	"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
 	"github.com/TeaOSLab/EdgeNode/internal/utils"
 	"github.com/iwind/TeaGo/Tea"
-	"github.com/iwind/TeaGo/types"
 	stringutil "github.com/iwind/TeaGo/utils/string"
 	"io"
 	"os"
@@ -25,17 +24,24 @@ import (
 )

 const (
-	SizeExpiredAt = 10
-	SizeKeyLength = 4
-	SizeNL        = 1
-	SizeEnd       = 4
+	SizeExpiresAt    = 4
+	SizeStatus       = 3
+	SizeURLLength    = 4
+	SizeHeaderLength = 4
+	SizeBodyLength   = 8
+
+	SizeMeta = SizeExpiresAt + SizeStatus + SizeURLLength + SizeHeaderLength + SizeBodyLength
 )

 var (
 	ErrNotFound      = errors.New("cache not found")
 	ErrFileIsWriting = errors.New("the file is writing")
+	ErrInvalidRange  = errors.New("invalid range")
 )

+// 文件缓存
+//   文件结构：
+//    [expires time] | [ status ] | [url length] | [header length] | [body length] | [url] [header data] [body data]
 type FileStorage struct {
 	policy      *serverconfigs.HTTPCachePolicy
 	cacheConfig *serverconfigs.HTTPFileCacheStorage
@@ -61,10 +67,10 @@ func (this *FileStorage) Policy() *serverconfigs.HTTPCachePolicy {
 // 初始化
 func (this *FileStorage) Init() error {
 	this.list.OnAdd(func(item *Item) {
-		atomic.AddInt64(&this.totalSize, item.Size)
+		atomic.AddInt64(&this.totalSize, item.TotalSize())
 	})
 	this.list.OnRemove(func(item *Item) {
-		atomic.AddInt64(&this.totalSize, -item.Size)
+		atomic.AddInt64(&this.totalSize, -item.TotalSize())
 	})

 	this.locker.Lock()
@@ -84,7 +90,15 @@ func (this *FileStorage) Init() error {
 		}

 		cost := time.Since(before).Seconds() * 1000
-		remotelogs.Println("CACHE", "init policy "+strconv.FormatInt(this.policy.Id, 10)+", cost: "+fmt.Sprintf("%.2f", cost)+" ms, count: "+strconv.Itoa(count)+", size: "+fmt.Sprintf("%.3f", float64(size)/1024/1024)+" M")
+		sizeMB := strconv.FormatInt(size, 10) + " Bytes"
+		if size > 1024*1024*1024 {
+			sizeMB = fmt.Sprintf("%.3f G", float64(size)/1024/1024/1024)
+		} else if size > 1024*1024 {
+			sizeMB = fmt.Sprintf("%.3f M", float64(size)/1024/1024)
+		} else if size > 1024 {
+			sizeMB = fmt.Sprintf("%.3f K", float64(size)/1024)
+		}
+		remotelogs.Println("CACHE", "init policy "+strconv.FormatInt(this.policy.Id, 10)+", cost: "+fmt.Sprintf("%.2f", cost)+" ms, count: "+strconv.Itoa(count)+", size: "+sizeMB)
 	}()

 	// 配置
@@ -131,107 +145,34 @@ func (this *FileStorage) Init() error {
 	return nil
 }

-func (this *FileStorage) Read(key string, readerBuf []byte, callback func(data []byte, size int64, expiredAt int64, isEOF bool)) error {
+func (this *FileStorage) OpenReader(key string) (Reader, error) {
 	hash, path := this.keyPath(key)
 	if !this.list.Exist(hash) {
-		return ErrNotFound
+		return nil, ErrNotFound
 	}

-	this.locker.RLock()
-	defer this.locker.RUnlock()
-
 	// TODO 尝试使用mmap加快读取速度
 	fp, err := os.OpenFile(path, os.O_RDONLY, 0444)
 	if err != nil {
 		if !os.IsNotExist(err) {
-			return err
+			return nil, err
 		}
-		return ErrNotFound
+		return nil, ErrNotFound
 	}
-	defer func() {
-		_ = fp.Close()
-	}()

-	// 是否过期
-	buf := make([]byte, SizeExpiredAt)
-	n, err := fp.Read(buf)
+	reader := NewFileReader(fp)
 	if err != nil {
-		return err
+		return nil, err
 	}
-	if n != len(buf) {
-		return ErrNotFound
-	}
-
-	expiredAt := types.Int64(string(buf))
-	if expiredAt < time.Now().Unix() {
-		// 已过期
-		_ = fp.Close()
-		_ = os.Remove(path)
-
-		return ErrNotFound
-	}
-
-	buf = make([]byte, SizeKeyLength)
-	n, err = fp.Read(buf)
+	err = reader.Init()
 	if err != nil {
-		return err
+		return nil, err
 	}
-	if n != len(buf) {
-		return ErrNotFound
-	}
-	keyLength := int(binary.BigEndian.Uint32(buf))
-
-	offset, err := fp.Seek(-SizeEnd, io.SeekEnd)
-	if err != nil {
-		return err
-	}
-	buf = make([]byte, SizeEnd)
-	n, err = fp.Read(buf)
-	if n != len(buf) {
-		return ErrNotFound
-	}
-	if string(buf) != "\n$$$" {
-		_ = fp.Close()
-		_ = os.Remove(path)
-		return ErrNotFound
-	}
-	startOffset := SizeExpiredAt + SizeKeyLength + keyLength + SizeNL
-	size := int(offset) + SizeEnd - startOffset
-	valueSize := offset - int64(startOffset)
-
-	_, err = fp.Seek(int64(startOffset), io.SeekStart)
-	if err != nil {
-		return err
-	}
-
-	for {
-		n, err := fp.Read(readerBuf)
-		if n > 0 {
-			size -= n
-			if size < SizeEnd { // 已经到了末尾区域
-				if n <= SizeEnd-size { // 已经到了末尾
-					break
-				} else {
-					callback(readerBuf[:n-(SizeEnd-size)], valueSize, expiredAt, true)
-				}
-			} else {
-				callback(readerBuf[:n], valueSize, expiredAt, false)
-			}
-		}
-		if err != nil {
-			if err != io.EOF {
-				return err
-			}
-
-			break
-		}
-	}
-
-	return nil
+	return reader, nil
 }

 // 打开缓存文件等待写入
-func (this *FileStorage) Open(key string, expiredAt int64) (Writer, error) {
+func (this *FileStorage) OpenWriter(key string, expiredAt int64, status int) (Writer, error) {
 	// 检查是否超出最大值
 	if this.policy.MaxKeys > 0 && this.list.Count() > this.policy.MaxKeys {
 		return nil, errors.New("write file cache failed: too many keys in cache storage")
@@ -256,7 +197,7 @@ func (this *FileStorage) Open(key string, expiredAt int64) (Writer, error) {
 	// 先删除
 	this.list.Remove(hash)

-	path := dir + "/" + hash + ".cache"
+	path := dir + "/" + hash + ".cache.tmp"
 	writer, err := os.OpenFile(path, os.O_CREATE|os.O_SYNC|os.O_WRONLY, 0666)
 	if err != nil {
 		return nil, err
@@ -291,21 +232,54 @@ func (this *FileStorage) Open(key string, expiredAt int64) (Writer, error) {
 	}

 	// 写入过期时间
-	_, err = writer.WriteString(fmt.Sprintf("%d", expiredAt))
+	bytes4 := make([]byte, 4)
+	{
+		binary.BigEndian.PutUint32(bytes4, uint32(expiredAt))
+		_, err = writer.Write(bytes4)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// 写入状态码
+	if status > 999 || status < 100 {
+		status = 200
+	}
+	_, err = writer.WriteString(strconv.Itoa(status))
 	if err != nil {
 		return nil, err
 	}

-	// 写入key length
-	b := make([]byte, SizeKeyLength)
-	binary.BigEndian.PutUint32(b, uint32(len(key)))
-	_, err = writer.Write(b)
-	if err != nil {
-		return nil, err
+	// 写入URL长度
+	{
+		binary.BigEndian.PutUint32(bytes4, uint32(len(key)))
+		_, err = writer.Write(bytes4)
+		if err != nil {
+			return nil, err
+		}
 	}

-	// 写入key
-	_, err = writer.WriteString(key + "\n")
+	// 写入Header Length
+	{
+		binary.BigEndian.PutUint32(bytes4, uint32(0))
+		_, err = writer.Write(bytes4)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// 写入Body Length
+	{
+		b := make([]byte, SizeBodyLength)
+		binary.BigEndian.PutUint64(b, uint64(0))
+		_, err = writer.Write(b)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// 写入URL
+	_, err = writer.WriteString(key)
 	if err != nil {
 		return nil, err
 	}
@@ -315,90 +289,9 @@ func (this *FileStorage) Open(key string, expiredAt int64) (Writer, error) {
 	return NewFileWriter(writer, key, expiredAt), nil
 }

-// 写入缓存数据
-// 目录结构：$root/p$policyId/$hash[:2]/$hash[2:4]/$hash.cache
-// 数据结构： [expiredAt] [key length] [key] \n value \n $$$
-func (this *FileStorage) Write(key string, expiredAt int64, valueReader io.Reader) error {
-	this.locker.Lock()
-	defer this.locker.Unlock()
-
-	hash := stringutil.Md5(key)
-	dir := this.cacheConfig.Dir + "/p" + strconv.FormatInt(this.policy.Id, 10) + "/" + hash[:2] + "/" + hash[2:4]
-
-	_, err := os.Stat(dir)
-	if err != nil {
-		if !os.IsNotExist(err) {
-			return err
-		}
-		err = os.MkdirAll(dir, 0777)
-		if err != nil {
-			return err
-		}
-	}
-	path := dir + "/" + hash + ".cache"
-	writer, err := os.OpenFile(path, os.O_CREATE|os.O_TRUNC|os.O_SYNC|os.O_WRONLY, 0777)
-	if err != nil {
-		return err
-	}
-
-	isOk := false
-	defer func() {
-		err = writer.Close()
-		if err != nil {
-			isOk = false
-		}
-
-		// 如果出错了，就删除文件，避免写一半
-		if !isOk {
-			_ = os.Remove(path)
-		}
-	}()
-
-	// 写入过期时间
-	_, err = writer.WriteString(fmt.Sprintf("%d", expiredAt))
-	if err != nil {
-		return err
-	}
-
-	// 写入key length
-	b := make([]byte, SizeKeyLength)
-	binary.BigEndian.PutUint32(b, uint32(len(key)))
-	_, err = writer.Write(b)
-	if err != nil {
-		return err
-	}
-
-	// 写入key
-	_, err = writer.WriteString(key + "\n")
-	if err != nil {
-		return err
-	}
-
-	// 写入数据
-	valueSize, err := io.Copy(writer, valueReader)
-	if err != nil {
-		return err
-	}
-
-	// 写入结束符
-	_, err = writer.WriteString("\n$$$")
-
-	isOk = true
-
-	// 写入List
-	this.list.Add(hash, &Item{
-		Key:       key,
-		ExpiredAt: expiredAt,
-		ValueSize: valueSize,
-		Size:      valueSize + SizeExpiredAt + SizeKeyLength + int64(len(key)) + SizeNL + SizeEnd,
-	})
-
-	return nil
-}
-
 // 添加到List
 func (this *FileStorage) AddToList(item *Item) {
-	item.Size = item.ValueSize + SizeExpiredAt + SizeKeyLength + int64(len(item.Key)) + SizeNL + SizeEnd
+	item.MetaSize = SizeMeta
 	hash := stringutil.Md5(item.Key)
 	this.list.Add(hash, item)
 }
@@ -553,7 +446,18 @@ func (this *FileStorage) initList() error {
 	this.list.Reset()

 	dir := this.dir()
-	files, err := filepath.Glob(dir + "/*/*/*.cache")
+
+	// 清除tmp
+	files, err := filepath.Glob(dir + "/*/*/*.cache.tmp")
+	if err != nil {
+		return err
+	}
+	for _, path := range files {
+		_ = os.Remove(path)
+	}
+
+	// 加载缓存
+	files, err = filepath.Glob(dir + "/*/*/*.cache")
 	if err != nil {
 		return err
 	}
@@ -603,59 +507,88 @@ func (this *FileStorage) decodeFile(path string) (*Item, error) {
 	if err != nil {
 		return nil, err
 	}
+
+	isAllOk := false
 	defer func() {
 		_ = fp.Close()
+
+		if !isAllOk {
+			_ = os.Remove(path)
+		}
 	}()

-	buf := make([]byte, SizeExpiredAt)
-	n, err := fp.Read(buf)
+	item := &Item{
+		MetaSize: SizeMeta,
+	}
+
+	bytes4 := make([]byte, 4)
+
+	// 过期时间
+	ok, err := this.readToBuff(fp, bytes4)
 	if err != nil {
 		return nil, err
 	}
-	if n != len(buf) {
-		// 数据格式错误
-		_ = fp.Close()
-		_ = os.Remove(path)
-
+	if !ok {
 		return nil, ErrNotFound
 	}
-	expiredAt := types.Int64(string(buf))
-	if expiredAt < time.Now().Unix() {
-		// 已过期
-		_ = fp.Close()
-		_ = os.Remove(path)
+	item.ExpiredAt = int64(binary.BigEndian.Uint32(bytes4))
+
+	// 是否已过期
+	if item.ExpiredAt < time.Now().Unix() {
 		return nil, ErrNotFound
 	}

-	buf = make([]byte, SizeKeyLength)
-	n, err = fp.Read(buf)
+	// URL Size
+	_, err = fp.Seek(int64(SizeExpiresAt+SizeStatus), io.SeekStart)
 	if err != nil {
 		return nil, err
 	}
-	keyLength := binary.BigEndian.Uint32(buf)
-
-	buf = make([]byte, keyLength)
-	n, err = fp.Read(buf)
+	ok, err = this.readToBuff(fp, bytes4)
 	if err != nil {
 		return nil, err
 	}
-	if n != int(keyLength) {
-		// 数据格式错误
-		_ = fp.Close()
-		_ = os.Remove(path)
+	if !ok {
 		return nil, ErrNotFound
 	}
+	urlSize := binary.BigEndian.Uint32(bytes4)

-	stat, err := fp.Stat()
+	// Header Size
+	ok, err = this.readToBuff(fp, bytes4)
 	if err != nil {
 		return nil, err
 	}
+	if !ok {
+		return nil, ErrNotFound
+	}
+	item.HeaderSize = int64(binary.BigEndian.Uint32(bytes4))
+
+	// Body Size
+	bytes8 := make([]byte, 8)
+	ok, err = this.readToBuff(fp, bytes8)
+	if err != nil {
+		return nil, err
+	}
+	if !ok {
+		return nil, ErrNotFound
+	}
+	item.BodySize = int64(binary.BigEndian.Uint64(bytes8))
+
+	// URL
+	if urlSize > 0 {
+		data := utils.BytePool1024.Get()
+		result, ok, err := this.readN(fp, data, int(urlSize))
+		utils.BytePool1024.Put(data)
+		if err != nil {
+			return nil, err
+		}
+		if !ok {
+			return nil, ErrNotFound
+		}
+		item.Key = string(result)
+	}
+
+	isAllOk = true

-	item := &Item{}
-	item.ExpiredAt = expiredAt
-	item.Key = string(buf)
-	item.Size = stat.Size()
-	item.ValueSize = item.Size - SizeExpiredAt - SizeKeyLength - int64(keyLength) - SizeNL - SizeEnd
 	return item, nil
 }

@@ -669,3 +602,31 @@ func (this *FileStorage) purgeLoop() {
 		}
 	})
 }
+
+func (this *FileStorage) readToBuff(fp *os.File, buf []byte) (ok bool, err error) {
+	n, err := fp.Read(buf)
+	if err != nil {
+		return false, err
+	}
+	ok = n == len(buf)
+	return
+}
+
+func (this *FileStorage) readN(fp *os.File, buf []byte, total int) (result []byte, ok bool, err error) {
+	for {
+		n, err := fp.Read(buf)
+		if err != nil {
+			return nil, false, err
+		}
+		if n > 0 {
+			if n >= total {
+				result = append(result, buf[:total]...)
+				ok = true
+				return result, ok, nil
+			} else {
+				total -= n
+				result = append(result, buf[:n]...)
+			}
+		}
+	}
+}
--- a/internal/caches/storage_file_test.go
+++ b/internal/caches/storage_file_test.go
@@ -2,11 +2,14 @@ package caches

 import (
 	"bytes"
+	"errors"
 	"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs"
 	"github.com/TeaOSLab/EdgeNode/internal/utils"
 	"github.com/iwind/TeaGo/Tea"
 	_ "github.com/iwind/TeaGo/bootstrap"
 	"github.com/iwind/TeaGo/logs"
+	"io/ioutil"
+	"net/http"
 	"runtime"
 	"strconv"
 	"sync"
@@ -40,7 +43,7 @@ func TestFileStorage_Init(t *testing.T) {
 	t.Log(len(storage.list.m), "entries left")
 }

-func TestFileStorage_Open(t *testing.T) {
+func TestFileStorage_OpenWriter(t *testing.T) {
 	storage := NewFileStorage(&serverconfigs.HTTPCachePolicy{
 		Id:   1,
 		IsOn: true,
@@ -57,13 +60,20 @@ func TestFileStorage_Open(t *testing.T) {
 		t.Log(time.Since(now).Seconds()*1000, "ms")
 	}()

-	writer, err := storage.Open("abc", time.Now().Unix()+3600)
+	header := []byte("Header")
+	body := []byte("This is Body")
+	writer, err := storage.OpenWriter("my-key", time.Now().Unix()+86400, 200)
 	if err != nil {
 		t.Fatal(err)
 	}
 	t.Log(writer)

-	_, err = writer.Write([]byte("Hello,World"))
+	_, err = writer.WriteHeader(header)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = writer.Write(body)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -72,6 +82,74 @@ func TestFileStorage_Open(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+
+	t.Log("header:", writer.HeaderSize(), "body:", writer.BodySize())
+	t.Log("ok")
+}
+
+func TestFileStorage_OpenWriter_HTTP(t *testing.T) {
+	storage := NewFileStorage(&serverconfigs.HTTPCachePolicy{
+		Id:   1,
+		IsOn: true,
+		Options: map[string]interface{}{
+			"dir": Tea.Root + "/caches",
+		},
+	})
+	err := storage.Init()
+	if err != nil {
+		t.Fatal(err)
+	}
+	now := time.Now()
+	defer func() {
+		t.Log(time.Since(now).Seconds()*1000, "ms")
+	}()
+
+	writer, err := storage.OpenWriter("my-http-response", time.Now().Unix()+86400, 200)
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Log(writer)
+
+	resp := &http.Response{
+		StatusCode: 200,
+		Header: http.Header{
+			"Content-Type":  []string{"text/html; charset=utf-8"},
+			"Last-Modified": []string{"Wed, 06 Jan 2021 10:03:29 GMT"},
+			"Server":        []string{"CDN-Server"},
+		},
+		Body: ioutil.NopCloser(bytes.NewBuffer([]byte("THIS IS HTTP BODY"))),
+	}
+
+	for k, v := range resp.Header {
+		for _, v1 := range v {
+			_, err = writer.WriteHeader([]byte(k + ":" + v1 + "\n"))
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+	}
+
+	buf := make([]byte, 1024)
+	for {
+		n, err := resp.Body.Read(buf)
+		if n > 0 {
+			_, err = writer.Write(buf[:n])
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+		if err != nil {
+			break
+		}
+	}
+
+	err = writer.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Log("header:", writer.HeaderSize(), "body:", writer.BodySize())
+	t.Log("ok")
 }

 func TestFileStorage_Concurrent_Open_DifferentFile(t *testing.T) {
@@ -99,7 +177,7 @@ func TestFileStorage_Concurrent_Open_DifferentFile(t *testing.T) {
 		go func(i int) {
 			defer wg.Done()

-			writer, err := storage.Open("abc"+strconv.Itoa(i), time.Now().Unix()+3600)
+			writer, err := storage.OpenWriter("abc"+strconv.Itoa(i), time.Now().Unix()+3600, 200)
 			if err != nil {
 				if err != ErrFileIsWriting {
 					t.Fatal(err)
@@ -151,7 +229,7 @@ func TestFileStorage_Concurrent_Open_SameFile(t *testing.T) {
 		go func(i int) {
 			defer wg.Done()

-			writer, err := storage.Open("abc"+strconv.Itoa(0), time.Now().Unix()+3600)
+			writer, err := storage.OpenWriter("abc"+strconv.Itoa(0), time.Now().Unix()+3600, 200)
 			if err != nil {
 				if err != ErrFileIsWriting {
 					t.Fatal(err)
@@ -179,35 +257,6 @@ func TestFileStorage_Concurrent_Open_SameFile(t *testing.T) {
 	wg.Wait()
 }

-func TestFileStorage_Write(t *testing.T) {
-	storage := NewFileStorage(&serverconfigs.HTTPCachePolicy{
-		Id:   1,
-		IsOn: true,
-		Options: map[string]interface{}{
-			"dir": Tea.Root + "/caches",
-		},
-	})
-	err := storage.Init()
-	if err != nil {
-		t.Fatal(err)
-	}
-	reader := bytes.NewBuffer([]byte(`my_value
-my_value2
-my_value3
-my_value4
-my_value5
-my_value6
-my_value7
-my_value8
-my_value9
-my_value10`))
-	err = storage.Write("my-key", time.Now().Unix()+3600, reader)
-	if err != nil {
-		t.Fatal(err)
-	}
-	t.Log("ok")
-}
-
 func TestFileStorage_Read(t *testing.T) {
 	storage := NewFileStorage(&serverconfigs.HTTPCachePolicy{
 		Id:   1,
@@ -221,9 +270,79 @@ func TestFileStorage_Read(t *testing.T) {
 		t.Fatal(err)
 	}
 	now := time.Now()
-	t.Log(storage.Read("my-key", make([]byte, 64), func(data []byte, size int64, expiredAt int64, isEOF bool) {
-		t.Log("[expiredAt]", "["+string(data)+"]")
-	}))
+	reader, err := storage.OpenReader("my-key")
+	if err != nil {
+		t.Fatal(err)
+	}
+	buf := make([]byte, 6)
+	t.Log(reader.Status())
+	err = reader.ReadHeader(buf, func(n int) (goNext bool, err error) {
+		t.Log("header:", string(buf[:n]))
+		return true, nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = reader.ReadBody(buf, func(n int) (goNext bool, err error) {
+		t.Log("body:", string(buf[:n]))
+		return true, nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Log(time.Since(now).Seconds()*1000, "ms")
+}
+
+func TestFileStorage_Read_HTTP_Response(t *testing.T) {
+	storage := NewFileStorage(&serverconfigs.HTTPCachePolicy{
+		Id:   1,
+		IsOn: true,
+		Options: map[string]interface{}{
+			"dir": Tea.Root + "/caches",
+		},
+	})
+	err := storage.Init()
+	if err != nil {
+		t.Fatal(err)
+	}
+	now := time.Now()
+	reader, err := storage.OpenReader("my-http-response")
+	if err != nil {
+		t.Fatal(err)
+	}
+	buf := make([]byte, 32)
+	t.Log(reader.Status())
+
+	headerBuf := []byte{}
+	err = reader.ReadHeader(buf, func(n int) (goNext bool, err error) {
+		headerBuf = append(headerBuf, buf...)
+		for {
+			nIndex := bytes.Index(headerBuf, []byte{'\n'})
+			if nIndex >= 0 {
+				row := headerBuf[:nIndex]
+				spaceIndex := bytes.Index(row, []byte{':'})
+				if spaceIndex <= 0 {
+					return false, errors.New("invalid header")
+				}
+
+				t.Log("header row:", string(row[:spaceIndex]), string(row[spaceIndex+1:]))
+				headerBuf = headerBuf[nIndex+1:]
+			} else {
+				break
+			}
+		}
+		return true, nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = reader.ReadBody(buf, func(n int) (goNext bool, err error) {
+		t.Log("body:", string(buf[:n]))
+		return true, nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
 	t.Log(time.Since(now).Seconds()*1000, "ms")
 }

@@ -240,9 +359,23 @@ func TestFileStorage_Read_NotFound(t *testing.T) {
 		t.Fatal(err)
 	}
 	now := time.Now()
-	t.Log(storage.Read("my-key-10000", make([]byte, 64), func(data []byte, size int64, expiredAt int64, isEOF bool) {
-		t.Log("[" + string(data) + "]")
-	}))
+	buf := make([]byte, 6)
+	reader, err := storage.OpenReader("my-key-10000")
+	if err != nil {
+		if err == ErrNotFound {
+			t.Log("cache not fund")
+			return
+		}
+		t.Fatal(err)
+	}
+
+	err = reader.ReadBody(buf, func(n int) (goNext bool, err error) {
+		t.Log("body:", string(buf[:n]))
+		return true, nil
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
 	t.Log(time.Since(now).Seconds()*1000, "ms")
 }

@@ -319,38 +452,6 @@ func TestFileStorage_CleanAll(t *testing.T) {
 	t.Log("ok")
 }

-func TestFileStorage_Purge(t *testing.T) {
-	storage := NewFileStorage(&serverconfigs.HTTPCachePolicy{
-		Id:   1,
-		IsOn: true,
-		Options: map[string]interface{}{
-			"dir": Tea.Root + "/caches",
-		},
-	})
-	err := storage.Init()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	_ = storage.Write("a", time.Now().Unix()+3600, bytes.NewReader([]byte("a1")))
-	_ = storage.Write("b", time.Now().Unix()+3600, bytes.NewReader([]byte("b1")))
-	_ = storage.Write("c", time.Now().Unix()+3600, bytes.NewReader([]byte("c1")))
-	_ = storage.Write("d", time.Now().Unix()+3600, bytes.NewReader([]byte("d1")))
-
-	before := time.Now()
-	defer func() {
-		t.Log(time.Since(before).Seconds()*1000, "ms")
-	}()
-
-	err = storage.Purge([]string{"a", "b1", "c"}, "")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	t.Log(storage.list.m)
-	t.Log("ok")
-}
-
 func TestFileStorage_Stop(t *testing.T) {
 	storage := NewFileStorage(&serverconfigs.HTTPCachePolicy{
 		Id:   1,
@@ -366,6 +467,26 @@ func TestFileStorage_Stop(t *testing.T) {
 	storage.Stop()
 }

+func TestFileStorage_DecodeFile(t *testing.T) {
+	storage := NewFileStorage(&serverconfigs.HTTPCachePolicy{
+		Id:   1,
+		IsOn: true,
+		Options: map[string]interface{}{
+			"dir": Tea.Root + "/caches",
+		},
+	})
+	err := storage.Init()
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, path := storage.keyPath("my-key")
+	item, err := storage.decodeFile(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	logs.PrintAsJSON(item, t)
+}
+
 func BenchmarkFileStorage_Read(b *testing.B) {
 	runtime.GOMAXPROCS(1)

@@ -382,9 +503,15 @@ func BenchmarkFileStorage_Read(b *testing.B) {
 	if err != nil {
 		b.Fatal(err)
 	}
-	buf := make([]byte, 1024)
 	for i := 0; i < b.N; i++ {
-		_ = storage.Read("my-key", buf, func(data []byte, size int64, expiredAt int64, isEOF bool) {
+		reader, err := storage.OpenReader("my-key")
+		if err != nil {
+			b.Fatal(err)
+		}
+		buf := make([]byte, 1024)
+		_ = reader.ReadBody(buf, func(n int) (goNext bool, err error) {
+			return true, nil
 		})
+		_ = reader.Close()
 	}
 }
--- a/internal/caches/storage_interface.go
+++ b/internal/caches/storage_interface.go
@@ -10,10 +10,10 @@ type StorageInterface interface {
 	Init() error

 	// 读取缓存
-	Read(key string, readerBuf []byte, callback func(data []byte, size int64, expiredAt int64, isEOF bool)) error
+	OpenReader(key string) (Reader, error)

 	// 打开缓存写入器等待写入
-	Open(key string, expiredAt int64) (Writer, error)
+	OpenWriter(key string, expiredAt int64, status int) (Writer, error)

 	// 删除某个键值对应的缓存
 	Delete(key string) error
--- a/internal/caches/storage_memory.go
+++ b/internal/caches/storage_memory.go
@@ -13,8 +13,10 @@ import (
 )

 type MemoryItem struct {
-	ExpiredAt int64
-	Value     []byte
+	ExpiredAt   int64
+	HeaderValue []byte
+	BodyValue   []byte
+	Status      int
 }

 type MemoryStorage struct {
@@ -39,10 +41,10 @@ func NewMemoryStorage(policy *serverconfigs.HTTPCachePolicy) *MemoryStorage {
 // 初始化
 func (this *MemoryStorage) Init() error {
 	this.list.OnAdd(func(item *Item) {
-		atomic.AddInt64(&this.totalSize, item.Size)
+		atomic.AddInt64(&this.totalSize, item.Size())
 	})
 	this.list.OnRemove(func(item *Item) {
-		atomic.AddInt64(&this.totalSize, -item.Size)
+		atomic.AddInt64(&this.totalSize, -item.Size())
 	})

 	if this.purgeDuration <= 0 {
@@ -61,31 +63,35 @@ func (this *MemoryStorage) Init() error {
 }

 // 读取缓存
-func (this *MemoryStorage) Read(key string, readerBuf []byte, callback func(data []byte, size int64, expiredAt int64, isEOF bool)) error {
+func (this *MemoryStorage) OpenReader(key string) (Reader, error) {
 	hash := this.hash(key)

 	this.locker.RLock()
 	item := this.valuesMap[hash]
 	if item == nil {
 		this.locker.RUnlock()
-		return ErrNotFound
+		return nil, ErrNotFound
 	}

 	if item.ExpiredAt > utils.UnixTime() {
-		// 这时如果callback处理比较慢的话，可能会影响性能，但目前没有更好的解决方案
-		callback(item.Value, int64(len(item.Value)), item.ExpiredAt, true)
 		this.locker.RUnlock()
-		return nil
+
+		reader := NewMemoryReader(item)
+		err := reader.Init()
+		if err != nil {
+			return nil, err
+		}
+		return reader, nil
 	}
 	this.locker.RUnlock()

 	_ = this.Delete(key)

-	return ErrNotFound
+	return nil, ErrNotFound
 }

 // 打开缓存写入器等待写入
-func (this *MemoryStorage) Open(key string, expiredAt int64) (Writer, error) {
+func (this *MemoryStorage) OpenWriter(key string, expiredAt int64, status int) (Writer, error) {
 	// 检查是否超出最大值
 	if this.policy.MaxKeys > 0 && this.list.Count() > this.policy.MaxKeys {
 		return nil, errors.New("write memory cache failed: too many keys in cache storage")
@@ -100,7 +106,7 @@ func (this *MemoryStorage) Open(key string, expiredAt int64) (Writer, error) {
 		return nil, err
 	}

-	return NewMemoryWriter(this.valuesMap, key, expiredAt, this.locker), nil
+	return NewMemoryWriter(this.valuesMap, key, expiredAt, status, this.locker), nil
 }

 // 删除某个键值对应的缓存
@@ -172,7 +178,7 @@ func (this *MemoryStorage) Policy() *serverconfigs.HTTPCachePolicy {

 // 将缓存添加到列表
 func (this *MemoryStorage) AddToList(item *Item) {
-	item.Size = item.ValueSize + int64(len(item.Key)) + 32 /** 32是我们评估的数据结构的长度 **/
+	item.MetaSize = int64(len(item.Key)) + 32 /** 32是我们评估的数据结构的长度 **/
 	hash := fmt.Sprintf("%d", this.hash(item.Key))
 	this.list.Add(hash, item)
 }
--- a/internal/caches/storage_memory_test.go
+++ b/internal/caches/storage_memory_test.go
@@ -9,21 +9,20 @@ import (
 	"time"
 )

-func TestMemoryStorage_Open(t *testing.T) {
+func TestMemoryStorage_OpenWriter(t *testing.T) {
 	storage := NewMemoryStorage(&serverconfigs.HTTPCachePolicy{})

-	writer, err := storage.Open("abc", time.Now().Unix()+60)
+	writer, err := storage.OpenWriter("abc", time.Now().Unix()+60, 200)
 	if err != nil {
 		t.Fatal(err)
 	}
+	_, _ = writer.WriteHeader([]byte("Header"))
 	_, _ = writer.Write([]byte("Hello"))
 	_, _ = writer.Write([]byte(", World"))
 	t.Log(storage.valuesMap)

 	{
-		err = storage.Read("abc", make([]byte, 8), func(data []byte, size int64, expiredAt int64, isEOF bool) {
-			t.Log("read:", string(data))
-		})
+		reader, err := storage.OpenReader("abc")
 		if err != nil {
 			if err == ErrNotFound {
 				t.Log("not found: abc")
@@ -31,12 +30,26 @@ func TestMemoryStorage_Open(t *testing.T) {
 				t.Fatal(err)
 			}
 		}
+		buf := make([]byte, 1024)
+		t.Log("status:", reader.Status())
+		err = reader.ReadHeader(buf, func(n int) (goNext bool, err error) {
+			t.Log("header:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
+		err = reader.ReadBody(buf, func(n int) (goNext bool, err error) {
+			t.Log("body:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
 	}

 	{
-		err = storage.Read("abc 2", make([]byte, 8), func(data []byte, size int64, expiredAt int64, isEOF bool) {
-			t.Log("read:", string(data))
-		})
+		_, err := storage.OpenReader("abc 2")
 		if err != nil {
 			if err == ErrNotFound {
 				t.Log("not found: abc2")
@@ -46,15 +59,13 @@ func TestMemoryStorage_Open(t *testing.T) {
 		}
 	}

-	writer, err = storage.Open("abc", time.Now().Unix()+60)
+	writer, err = storage.OpenWriter("abc", time.Now().Unix()+60, 200)
 	if err != nil {
 		t.Fatal(err)
 	}
 	_, _ = writer.Write([]byte("Hello123"))
 	{
-		err = storage.Read("abc", make([]byte, 8), func(data []byte, size int64, expiredAt int64, isEOF bool) {
-			t.Log("read:", string(data))
-		})
+		reader, err := storage.OpenReader("abc")
 		if err != nil {
 			if err == ErrNotFound {
 				t.Log("not found: abc")
@@ -62,13 +73,21 @@ func TestMemoryStorage_Open(t *testing.T) {
 				t.Fatal(err)
 			}
 		}
+		buf := make([]byte, 1024)
+		err = reader.ReadBody(buf, func(n int) (goNext bool, err error) {
+			t.Log("abc:", string(buf[:n]))
+			return true, nil
+		})
+		if err != nil {
+			t.Fatal(err)
+		}
 	}
 }

 func TestMemoryStorage_Delete(t *testing.T) {
 	storage := NewMemoryStorage(&serverconfigs.HTTPCachePolicy{})
 	{
-		writer, err := storage.Open("abc", time.Now().Unix()+60)
+		writer, err := storage.OpenWriter("abc", time.Now().Unix()+60, 200)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -76,7 +95,7 @@ func TestMemoryStorage_Delete(t *testing.T) {
 		t.Log(len(storage.valuesMap))
 	}
 	{
-		writer, err := storage.Open("abc1", time.Now().Unix()+60)
+		writer, err := storage.OpenWriter("abc1", time.Now().Unix()+60, 200)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -91,7 +110,7 @@ func TestMemoryStorage_Stat(t *testing.T) {
 	storage := NewMemoryStorage(&serverconfigs.HTTPCachePolicy{})
 	expiredAt := time.Now().Unix() + 60
 	{
-		writer, err := storage.Open("abc", expiredAt)
+		writer, err := storage.OpenWriter("abc", expiredAt, 200)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -99,12 +118,12 @@ func TestMemoryStorage_Stat(t *testing.T) {
 		t.Log(len(storage.valuesMap))
 		storage.AddToList(&Item{
 			Key:       "abc",
-			Size:      5,
+			BodySize:  5,
 			ExpiredAt: expiredAt,
 		})
 	}
 	{
-		writer, err := storage.Open("abc1", expiredAt)
+		writer, err := storage.OpenWriter("abc1", expiredAt, 200)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -112,7 +131,7 @@ func TestMemoryStorage_Stat(t *testing.T) {
 		t.Log(len(storage.valuesMap))
 		storage.AddToList(&Item{
 			Key:       "abc1",
-			Size:      5,
+			BodySize:  5,
 			ExpiredAt: expiredAt,
 		})
 	}
@@ -128,26 +147,26 @@ func TestMemoryStorage_CleanAll(t *testing.T) {
 	storage := NewMemoryStorage(&serverconfigs.HTTPCachePolicy{})
 	expiredAt := time.Now().Unix() + 60
 	{
-		writer, err := storage.Open("abc", expiredAt)
+		writer, err := storage.OpenWriter("abc", expiredAt, 200)
 		if err != nil {
 			t.Fatal(err)
 		}
 		_, _ = writer.Write([]byte("Hello"))
 		storage.AddToList(&Item{
 			Key:       "abc",
-			Size:      5,
+			BodySize:  5,
 			ExpiredAt: expiredAt,
 		})
 	}
 	{
-		writer, err := storage.Open("abc1", expiredAt)
+		writer, err := storage.OpenWriter("abc1", expiredAt, 200)
 		if err != nil {
 			t.Fatal(err)
 		}
 		_, _ = writer.Write([]byte("Hello"))
 		storage.AddToList(&Item{
 			Key:       "abc1",
-			Size:      5,
+			BodySize:  5,
 			ExpiredAt: expiredAt,
 		})
 	}
@@ -162,26 +181,26 @@ func TestMemoryStorage_Purge(t *testing.T) {
 	storage := NewMemoryStorage(&serverconfigs.HTTPCachePolicy{})
 	expiredAt := time.Now().Unix() + 60
 	{
-		writer, err := storage.Open("abc", expiredAt)
+		writer, err := storage.OpenWriter("abc", expiredAt, 200)
 		if err != nil {
 			t.Fatal(err)
 		}
 		_, _ = writer.Write([]byte("Hello"))
 		storage.AddToList(&Item{
 			Key:       "abc",
-			Size:      5,
+			BodySize:  5,
 			ExpiredAt: expiredAt,
 		})
 	}
 	{
-		writer, err := storage.Open("abc1", expiredAt)
+		writer, err := storage.OpenWriter("abc1", expiredAt, 200)
 		if err != nil {
 			t.Fatal(err)
 		}
 		_, _ = writer.Write([]byte("Hello"))
 		storage.AddToList(&Item{
 			Key:       "abc1",
-			Size:      5,
+			BodySize:  5,
 			ExpiredAt: expiredAt,
 		})
 	}
@@ -203,14 +222,14 @@ func TestMemoryStorage_Expire(t *testing.T) {
 	for i := 0; i < 1000; i++ {
 		expiredAt := time.Now().Unix() + int64(rands.Int(0, 60))
 		key := "abc" + strconv.Itoa(i)
-		writer, err := storage.Open(key, expiredAt)
+		writer, err := storage.OpenWriter(key, expiredAt, 200)
 		if err != nil {
 			t.Fatal(err)
 		}
 		_, _ = writer.Write([]byte("Hello"))
 		storage.AddToList(&Item{
 			Key:       key,
-			Size:      5,
+			BodySize:  5,
 			ExpiredAt: expiredAt,
 		})
 	}
--- a/internal/caches/writer.go
+++ b/internal/caches/writer.go
@@ -2,11 +2,17 @@ package caches

 // 缓存内容写入接口
 type Writer interface {
-	// 写入数据
+	// 写入Header数据
+	WriteHeader(data []byte) (n int, err error)
+
+	// 写入Body数据
 	Write(data []byte) (n int, err error)

-	// 写入的总数据大小
-	Size() int64
+	// 写入的Header数据大小
+	HeaderSize() int64
+
+	// 写入的Body数据大小
+	BodySize() int64

 	// 关闭
 	Close() error
--- a/internal/caches/writer_file.go
+++ b/internal/caches/writer_file.go
@@ -1,15 +1,19 @@
 package caches

 import (
+	"encoding/binary"
+	"github.com/iwind/TeaGo/types"
+	"io"
 	"os"
+	"strings"
 )

 type FileWriter struct {
 	rawWriter  *os.File
 	key        string
-	size       int64
+	headerSize int64
+	bodySize   int64
 	expiredAt  int64
-	isReleased bool
 }

 func NewFileWriter(rawWriter *os.File, key string, expiredAt int64) *FileWriter {
@@ -21,40 +25,98 @@ func NewFileWriter(rawWriter *os.File, key string, expiredAt int64) *FileWriter
 }

 // 写入数据
-func (this *FileWriter) Write(data []byte) (n int, err error) {
+func (this *FileWriter) WriteHeader(data []byte) (n int, err error) {
 	n, err = this.rawWriter.Write(data)
-	this.size += int64(n)
+	this.headerSize += int64(n)
 	if err != nil {
-		_ = this.rawWriter.Close()
-		_ = os.Remove(this.rawWriter.Name())
-		this.Release()
+		_ = this.Discard()
 	}
 	return
 }

+// 写入Header长度数据
+func (this *FileWriter) WriteHeaderLength(headerLength int) error {
+	bytes4 := make([]byte, 4)
+	binary.BigEndian.PutUint32(bytes4, uint32(headerLength))
+	_, err := this.rawWriter.Seek(SizeExpiresAt+SizeStatus+SizeURLLength, io.SeekStart)
+	if err != nil {
+		_ = this.Discard()
+		return err
+	}
+	_, err = this.rawWriter.Write(bytes4)
+	if err != nil {
+		_ = this.Discard()
+		return err
+	}
+	return nil
+}
+
+// 写入数据
+func (this *FileWriter) Write(data []byte) (n int, err error) {
+	n, err = this.rawWriter.Write(data)
+	this.bodySize += int64(n)
+	if err != nil {
+		_ = this.Discard()
+	}
+	return
+}
+
+// 写入Body长度数据
+func (this *FileWriter) WriteBodyLength(bodyLength int64) error {
+	bytes8 := make([]byte, 8)
+	binary.BigEndian.PutUint64(bytes8, uint64(bodyLength))
+	_, err := this.rawWriter.Seek(SizeExpiresAt+SizeStatus+SizeURLLength+SizeHeaderLength, io.SeekStart)
+	if err != nil {
+		_ = this.Discard()
+		return err
+	}
+	_, err = this.rawWriter.Write(bytes8)
+	if err != nil {
+		_ = this.Discard()
+		return err
+	}
+	return nil
+}
+
 // 关闭
 func (this *FileWriter) Close() error {
-	// 写入结束符
-	_, err := this.rawWriter.WriteString("\n$$$")
+	err := this.WriteHeaderLength(types.Int(this.headerSize))
 	if err != nil {
-		_ = os.Remove(this.rawWriter.Name())
+		return err
+	}
+	err = this.WriteBodyLength(this.bodySize)
+	if err != nil {
+		return err
 	}
-	_ = this.rawWriter.Close()

-	this.Release()
+	path := this.rawWriter.Name()
+	err = this.rawWriter.Close()
+	if err != nil {
+		_ = os.Remove(path)
+	} else {
+		err = os.Rename(path, strings.Replace(path, ".tmp", "", 1))
+		if err != nil {
+			_ = os.Remove(path)
+		}
+	}

 	return err
 }

 // 丢弃
 func (this *FileWriter) Discard() error {
+	_ = this.rawWriter.Close()
+
 	err := os.Remove(this.rawWriter.Name())
-	this.Release()
 	return err
 }

-func (this *FileWriter) Size() int64 {
-	return this.size
+func (this *FileWriter) HeaderSize() int64 {
+	return this.headerSize
+}
+
+func (this *FileWriter) BodySize() int64 {
+	return this.bodySize
 }

 func (this *FileWriter) ExpiredAt() int64 {
@@ -64,11 +126,3 @@ func (this *FileWriter) ExpiredAt() int64 {
 func (this *FileWriter) Key() string {
 	return this.key
 }
-
-// 释放锁，一定要调用
-func (this *FileWriter) Release() {
-	if this.isReleased {
-		return
-	}
-	this.isReleased = true
-}
--- a/internal/caches/writer_gzip.go
+++ b/internal/caches/writer_gzip.go
@@ -18,6 +18,20 @@ func NewGzipWriter(gw Writer, key string, expiredAt int64) Writer {
 	}
 }

+func (this *gzipWriter) WriteHeader(data []byte) (n int, err error) {
+	return this.writer.Write(data)
+}
+
+// 写入Header长度数据
+func (this *gzipWriter) WriteHeaderLength(headerLength int) error {
+	return nil
+}
+
+// 写入Body长度数据
+func (this *gzipWriter) WriteBodyLength(bodyLength int64) error {
+	return nil
+}
+
 func (this *gzipWriter) Write(data []byte) (n int, err error) {
 	return this.writer.Write(data)
 }
@@ -46,6 +60,10 @@ func (this *gzipWriter) ExpiredAt() int64 {
 	return this.expiredAt
 }

-func (this *gzipWriter) Size() int64 {
-	return this.rawWriter.Size()
+func (this *gzipWriter) HeaderSize() int64 {
+	return this.rawWriter.HeaderSize()
+}
+
+func (this *gzipWriter) BodySize() int64 {
+	return this.rawWriter.BodySize()
 }
--- a/internal/caches/writer_memory.go
+++ b/internal/caches/writer_memory.go
@@ -11,22 +11,25 @@ type MemoryWriter struct {
 	m              map[uint64]*MemoryItem
 	locker         *sync.RWMutex
 	isFirstWriting bool
-	size           int64
+	headerSize     int64
+	bodySize       int64
+	status         int
 }

-func NewMemoryWriter(m map[uint64]*MemoryItem, key string, expiredAt int64, locker *sync.RWMutex) *MemoryWriter {
+func NewMemoryWriter(m map[uint64]*MemoryItem, key string, expiredAt int64, status int, locker *sync.RWMutex) *MemoryWriter {
 	return &MemoryWriter{
 		m:              m,
 		key:            key,
 		expiredAt:      expiredAt,
 		locker:         locker,
 		isFirstWriting: true,
+		status:         status,
 	}
 }

 // 写入数据
-func (this *MemoryWriter) Write(data []byte) (n int, err error) {
-	this.size += int64(len(data))
+func (this *MemoryWriter) WriteHeader(data []byte) (n int, err error) {
+	this.headerSize += int64(len(data))

 	hash := this.hash(this.key)
 	this.locker.Lock()
@@ -34,14 +37,43 @@ func (this *MemoryWriter) Write(data []byte) (n int, err error) {
 	if ok {
 		// 第一次写先清空
 		if this.isFirstWriting {
-			item.Value = nil
+			item.HeaderValue = nil
+			item.BodyValue = nil
 			this.isFirstWriting = false
 		}
-		item.Value = append(item.Value, data...)
+		item.HeaderValue = append(item.HeaderValue, data...)
 	} else {
 		item := &MemoryItem{}
-		item.Value = append([]byte{}, data...)
+		item.HeaderValue = append([]byte{}, data...)
 		item.ExpiredAt = this.expiredAt
+		item.Status = this.status
+		this.m[hash] = item
+		this.isFirstWriting = false
+	}
+	this.locker.Unlock()
+	return len(data), nil
+}
+
+// 写入数据
+func (this *MemoryWriter) Write(data []byte) (n int, err error) {
+	this.bodySize += int64(len(data))
+
+	hash := this.hash(this.key)
+	this.locker.Lock()
+	item, ok := this.m[hash]
+	if ok {
+		// 第一次写先清空
+		if this.isFirstWriting {
+			item.HeaderValue = nil
+			item.BodyValue = nil
+			this.isFirstWriting = false
+		}
+		item.BodyValue = append(item.BodyValue, data...)
+	} else {
+		item := &MemoryItem{}
+		item.BodyValue = append([]byte{}, data...)
+		item.ExpiredAt = this.expiredAt
+		item.Status = this.status
 		this.m[hash] = item
 		this.isFirstWriting = false
 	}
@@ -50,8 +82,12 @@ func (this *MemoryWriter) Write(data []byte) (n int, err error) {
 }

 // 数据尺寸
-func (this *MemoryWriter) Size() int64 {
-	return this.size
+func (this *MemoryWriter) HeaderSize() int64 {
+	return this.headerSize
+}
+
+func (this *MemoryWriter) BodySize() int64 {
+	return this.bodySize
 }

 // 关闭
--- a/internal/nodes/api_stream.go
+++ b/internal/nodes/api_stream.go
@@ -159,26 +159,38 @@ func (this *APIStream) handleWriteCache(message *pb.NodeStreamMessage) error {
 	}

 	expiredAt := time.Now().Unix() + msg.LifeSeconds
-	writer, err := storage.Open(msg.Key, expiredAt)
+	writer, err := storage.OpenWriter(msg.Key, expiredAt, 200)
 	if err != nil {
 		this.replyFail(message.RequestId, "prepare writing failed: "+err.Error())
 		return err
 	}

-	_, err = writer.Write(msg.Value)
+	// 写入一个空的Header
+	_, err = writer.WriteHeader([]byte(":"))
 	if err != nil {
-		_ = writer.Discard()
 		this.replyFail(message.RequestId, "write failed: "+err.Error())
 		return err
 	}
-	err = writer.Close()
-	if err == nil {
-		storage.AddToList(&caches.Item{
-			Key:       msg.Key,
-			ExpiredAt: expiredAt,
-		})
+
+	// 写入数据
+	_, err = writer.Write(msg.Value)
+	if err != nil {
+		this.replyFail(message.RequestId, "write failed: "+err.Error())
+		return err
 	}

+	err = writer.Close()
+	if err != nil {
+		this.replyFail(message.RequestId, "write failed: "+err.Error())
+		return err
+	}
+	storage.AddToList(&caches.Item{
+		Key:        msg.Key,
+		ExpiredAt:  expiredAt,
+		HeaderSize: writer.HeaderSize(),
+		BodySize:   writer.BodySize(),
+	})
+
 	this.replyOk(message.RequestId, "write ok")

 	return nil
@@ -203,21 +215,20 @@ func (this *APIStream) handleReadCache(message *pb.NodeStreamMessage) error {
 		}()
 	}

-	buf := make([]byte, 1024)
-	size := 0
-	err = storage.Read(msg.Key, buf, func(data []byte, valueSize int64, expiredAt int64, isEOF bool) {
-		size += len(data)
-	})
+	reader, err := storage.OpenReader(msg.Key)
 	if err != nil {
 		if err == caches.ErrNotFound {
 			this.replyFail(message.RequestId, "key not found")
 			return nil
 		}
 		this.replyFail(message.RequestId, "read key failed: "+err.Error())
-		return err
+		return nil
 	}
+	defer func() {
+		_ = reader.Close()
+	}()

-	this.replyOk(message.RequestId, "value "+strconv.Itoa(size)+" bytes")
+	this.replyOk(message.RequestId, "value "+strconv.FormatInt(reader.BodySize(), 10)+" bytes")

 	return nil
 }
@@ -373,6 +384,13 @@ func (this *APIStream) handlePreheatCache(message *pb.NodeStreamMessage) error {
 				return
 			}

+			if resp.StatusCode != 200 {
+				locker.Lock()
+				errorMessages = append(errorMessages, "request failed: "+key+": status code '"+strconv.Itoa(resp.StatusCode)+"'")
+				locker.Unlock()
+				return
+			}
+
 			defer func() {
 				_ = resp.Body.Close()
 			}()
@@ -388,7 +406,7 @@ func (this *APIStream) handlePreheatCache(message *pb.NodeStreamMessage) error {
 			}

 			expiredAt := time.Now().Unix() + 8600
-			writer, err := storage.Open(key, expiredAt) // TODO 可以设置缓存过期时间
+			writer, err := storage.OpenWriter(key, expiredAt, 200) // TODO 可以设置缓存过期时间
 			if err != nil {
 				locker.Lock()
 				errorMessages = append(errorMessages, "open cache writer failed: "+key+": "+err.Error())
@@ -398,6 +416,21 @@ func (this *APIStream) handlePreheatCache(message *pb.NodeStreamMessage) error {

 			buf := make([]byte, 16*1024)
 			isClosed := false
+
+			// 写入Header
+			for k, v := range resp.Header {
+				for _, v1 := range v {
+					_, err = writer.WriteHeader([]byte(k + ":" + v1 + "\n"))
+					if err != nil {
+						locker.Lock()
+						errorMessages = append(errorMessages, "write failed: "+key+": "+err.Error())
+						locker.Unlock()
+						return
+					}
+				}
+			}
+
+			// 写入Body
 			for {
 				n, err := resp.Body.Read(buf)
 				if n > 0 {
@@ -411,6 +444,7 @@ func (this *APIStream) handlePreheatCache(message *pb.NodeStreamMessage) error {
 				}
 				if err != nil {
 					if err == io.EOF {
+
 						err = writer.Close()
 						if err == nil {
 							storage.AddToList(&caches.Item{
@@ -484,7 +518,7 @@ func (this *APIStream) handleCheckSystemdService(message *pb.NodeStreamMessage)
 	cmd.Add(systemctl, "is-enabled", shortName)
 	output, err := cmd.Run()
 	if err != nil {
-		this.replyFail(message.RequestId, "'systemctl' command error: " + err.Error())
+		this.replyFail(message.RequestId, "'systemctl' command error: "+err.Error())
 		return nil
 	}
 	if output == "enabled" {
--- a/internal/nodes/http_request_cache.go
+++ b/internal/nodes/http_request_cache.go
@@ -2,9 +2,9 @@ package nodes

 import (
 	"bytes"
+	"errors"
 	"github.com/TeaOSLab/EdgeNode/internal/caches"
 	"github.com/TeaOSLab/EdgeNode/internal/remotelogs"
-	"github.com/iwind/TeaGo/types"
 	"net/http"
 	"strconv"
 )
@@ -66,74 +66,12 @@ func (this *HTTPRequest) doCacheRead() (shouldStop bool) {
 		return
 	}

-	isBroken := false
-	headerBuf := []byte{}
-	statusCode := http.StatusOK
-	statusFound := false
-	headerFound := false
-
 	buf := bytePool32k.Get()
-	err := storage.Read(key, buf, func(data []byte, valueSize int64, expiredAt int64, isEOF bool) {
-		if isBroken {
-			return
-		}
-
-		// 如果Header已发送完毕
-		if headerFound {
-			_, _ = this.writer.Write(data)
-			return
-		}
-
-		headerBuf = append(headerBuf, data...)
-
-		if !statusFound {
-			lineIndex := bytes.IndexByte(headerBuf, '\n')
-			if lineIndex < 0 {
-				return
-			}
-
-			pieces := bytes.Split(headerBuf[:lineIndex], []byte{' '})
-			if len(pieces) < 2 {
-				isBroken = true
-				return
-			}
-			statusCode = types.Int(string(pieces[1]))
-			statusFound = true
-			headerBuf = headerBuf[lineIndex+1:]
-
-			// cache相关变量
-			this.varMapping["cache.status"] = "HIT"
-		}
-
-		for {
-			lineIndex := bytes.IndexByte(headerBuf, '\n')
-			if lineIndex < 0 {
-				break
-			}
-			if lineIndex == 0 || lineIndex == 1 {
-				headerFound = true
-
-				this.processResponseHeaders(statusCode)
-				this.writer.WriteHeader(statusCode)
-
-				_, _ = this.writer.Write(headerBuf[lineIndex+1:])
-				headerBuf = nil
-				break
-			}
-
-			// 分解Header
-			line := headerBuf[:lineIndex]
-			colonIndex := bytes.IndexByte(line, ':')
-			if colonIndex <= 0 {
-				continue
-			}
-			this.writer.Header().Set(string(line[:colonIndex]), string(bytes.TrimSpace(line[colonIndex+1:])))
-			headerBuf = headerBuf[lineIndex+1:]
-		}
-	})
-
-	bytePool32k.Put(buf)
+	defer func() {
+		bytePool32k.Put(buf)
+	}()

+	reader, err := storage.OpenReader(key)
 	if err != nil {
 		if err == caches.ErrNotFound {
 			// cache相关变量
@@ -144,11 +82,56 @@ func (this *HTTPRequest) doCacheRead() (shouldStop bool) {
 		remotelogs.Error("REQUEST_CACHE", "read from cache failed: "+err.Error())
 		return
 	}
+	defer func() {
+		_ = reader.Close()
+	}()

-	if isBroken {
+	this.varMapping["cache.status"] = "HIT"
+
+	// 读取Header
+	headerBuf := []byte{}
+	err = reader.ReadHeader(buf, func(n int) (goNext bool, err error) {
+		headerBuf = append(headerBuf, buf[:n]...)
+		for {
+			nIndex := bytes.Index(headerBuf, []byte{'\n'})
+			if nIndex >= 0 {
+				row := headerBuf[:nIndex]
+				spaceIndex := bytes.Index(row, []byte{':'})
+				if spaceIndex <= 0 {
+					return false, errors.New("invalid header '" + string(row) + "'")
+				}
+
+				this.writer.Header().Set(string(row[:spaceIndex]), string(row[spaceIndex+1:]))
+				headerBuf = headerBuf[nIndex+1:]
+			} else {
+				break
+			}
+		}
+		return true, nil
+	})
+	if err != nil {
+		remotelogs.Error("REQUEST_CACHE", "read from cache failed: "+err.Error())
 		return
 	}

+	this.processResponseHeaders(reader.Status())
+	this.writer.WriteHeader(reader.Status())
+
+	// 输出Body
+	if this.RawReq.Method != http.MethodHead {
+		err = reader.ReadBody(buf, func(n int) (goNext bool, err error) {
+			_, err = this.writer.Write(buf[:n])
+			if err != nil {
+				return false, err
+			}
+			return true, nil
+		})
+		if err != nil {
+			remotelogs.Error("REQUEST_CACHE", "read from cache failed: "+err.Error())
+			return
+		}
+	}
+
 	this.cacheRef = nil // 终止读取不再往下传递
 	return true
 }
--- a/internal/nodes/http_writer.go
+++ b/internal/nodes/http_writer.go
@@ -113,7 +113,6 @@ func (this *HTTPWriter) Write(data []byte) (n int, err error) {
 		if this.cacheWriter != nil {
 			_, err = this.cacheWriter.Write(data)
 			if err != nil {
-				_ = this.cacheWriter.Discard()
 				this.cacheWriter = nil
 				remotelogs.Error("REQUEST_WRITER", "write cache failed: "+err.Error())
 			}
@@ -216,9 +215,10 @@ func (this *HTTPWriter) Close() {
 		err := this.cacheWriter.Close()
 		if err == nil {
 			this.cacheStorage.AddToList(&caches.Item{
-				Key:       this.cacheWriter.Key(),
-				ExpiredAt: this.cacheWriter.ExpiredAt(),
-				ValueSize: this.cacheWriter.Size(),
+				Key:        this.cacheWriter.Key(),
+				ExpiredAt:  this.cacheWriter.ExpiredAt(),
+				HeaderSize: this.cacheWriter.HeaderSize(),
+				BodySize:   this.cacheWriter.BodySize(),
 			})
 		}
 	}
@@ -364,7 +364,7 @@ func (this *HTTPWriter) prepareCache(size int64) {
 		life = 60
 	}
 	expiredAt := utils.UnixTime() + life
-	cacheWriter, err := storage.Open(this.req.cacheKey, expiredAt)
+	cacheWriter, err := storage.OpenWriter(this.req.cacheKey, expiredAt, this.StatusCode())
 	if err != nil {
 		if err != caches.ErrFileIsWriting {
 			remotelogs.Error("REQUEST_WRITER", "write cache failed: "+err.Error())
@@ -377,12 +377,14 @@ func (this *HTTPWriter) prepareCache(size int64) {
 	}

 	// 写入Header
-	headerData := this.HeaderData()
-	_, err = cacheWriter.Write(headerData)
-	if err != nil {
-		remotelogs.Error("REQUEST_WRITER", "write cache failed: "+err.Error())
-		_ = this.cacheWriter.Discard()
-		this.cacheWriter = nil
-		return
+	for k, v := range this.Header() {
+		for _, v1 := range v {
+			_, err = cacheWriter.WriteHeader([]byte(k + ":" + v1 + "\n"))
+			if err != nil {
+				remotelogs.Error("REQUEST_WRITER", "write cache failed: "+err.Error())
+				this.cacheWriter = nil
+				return
+			}
+		}
 	}
 }
--- a/internal/utils/byte_pool.go
+++ b/internal/utils/byte_pool.go
@@ -1,14 +1,11 @@
 package utils

-import (
-	"time"
-)
+var BytePool1024 = NewBytePool(20480, 1024)

 // pool for get byte slice
 type BytePool struct {
 	c      chan []byte
 	length int
-	ticker *Ticker

 	lastSize int
 }
@@ -25,38 +22,9 @@ func NewBytePool(maxSize, length int) *BytePool {
 		c:      make(chan []byte, maxSize),
 		length: length,
 	}
-	pool.start()
 	return pool
 }

-func (this *BytePool) start() {
-	// 清除Timer
-	this.ticker = NewTicker(1 * time.Minute)
-	go func() {
-		for this.ticker.Next() {
-			currentSize := len(this.c)
-			if currentSize <= 32 || this.lastSize == 0 || this.lastSize != currentSize {
-				this.lastSize = currentSize
-				continue
-			}
-
-			i := 0
-		For:
-			for {
-				select {
-				case _ = <-this.c:
-					i++
-					if i >= currentSize/2 {
-						break For
-					}
-				default:
-					break For
-				}
-			}
-		}
-	}()
-}
-
 // 获取一个新的byte slice
 func (this *BytePool) Get() (b []byte) {
 	select {
@@ -83,8 +51,3 @@ func (this *BytePool) Put(b []byte) {
 func (this *BytePool) Size() int {
 	return len(this.c)
 }
-
-// 销毁
-func (this *BytePool) Destroy() {
-	this.ticker.Stop()
-}
--- a/internal/utils/number.go
+++ b/internal/utils/number.go
@@ -0,0 +1,15 @@
+package utils
+
+func MinInt(min1 int, min2 int) int {
+	if min1 < min2 {
+		return min1
+	}
+	return min2
+}
+
+func MaxInt(min1 int, min2 int) int {
+	if min1 < min2 {
+		return min2
+	}
+	return min1
+}