修复热点数据从文件系统转移到内存时可能不完整的Bug/实现部分Partial Content功能

internal/caches/writer_file.go

@@ -2,6 +2,7 @@ package caches
 
 import (
 	"encoding/binary"
+	"errors"
 	"github.com/iwind/TeaGo/types"
 	"io"
 	"os"
@@ -65,6 +66,13 @@ func (this *FileWriter) Write(data []byte) (n int, err error) {
 	return
 }
 
+// WriteAt 在指定位置写入数据
+func (this *FileWriter) WriteAt(data []byte, offset int64) error {
+	_ = data
+	_ = offset
+	return errors.New("not supported")
+}
+
 // WriteBodyLength 写入Body长度数据
 func (this *FileWriter) WriteBodyLength(bodyLength int64) error {
 	bytes8 := make([]byte, 8)