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msg_writer_dir.go
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/
msg_writer_dir.go
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package msgqueue
import (
"bytes"
"fmt"
"io"
)
const (
filePrefix = "backup-"
)
var MaxFileSize = 1024 * 1024 * 100
var _ MsgWriter = (*dirMsgWriter)(nil)
type GetFilePathAndFileIndexFromDirCb func(string, int) (filePath string, fileIndex int, err error)
type dirMsgWriter struct {
io.WriteCloser
haveWriteSize int
fileIndex int
dir string
timeNewFile func(k, v []byte) bool
}
func NewDirMsgWriter(dir string, cb GetFilePathAndFileIndexFromDirCb) (MsgWriter, error) {
filePath, fileIndex, err := cb(dir, MaxFileSize)
if err != nil {
return &dirMsgWriter{}, err
}
file, err := openFile(filePath)
if err != nil {
return &dirMsgWriter{}, err
}
fileSize := GetFileSize(filePath)
if fileSize < 0 {
return &dirMsgWriter{}, fmt.Errorf("The parameter passed in is not the correct file path. ")
}
diw := &dirMsgWriter{
WriteCloser: file,
fileIndex: fileIndex,
dir: dir,
haveWriteSize: fileSize,
}
diw.timeNewFile = diw.timeToNewFile()
return diw, nil
}
func (w *dirMsgWriter) WriteKV(k, v []byte) error {
if w.timeNewFile(k, v) {
if err := w.Close(); err != nil {
return err
}
file, err := openFile(GetFileName(w.dir, w.fileIndex+1))
if err != nil {
return err
}
w.WriteCloser = file
w.fileIndex++
w.haveWriteSize = 0
}
buferr := bytes.NewBuffer(nil)
buferr.Write(k)
buferr.Write([]byte("#"))
buferr.Write(v)
buferr.Write([]byte("\r\n"))
if _, err := w.WriteCloser.Write(buferr.Bytes()); err != nil {
return err
}
w.haveWriteSize += len(k) + len(v) + 3
return nil
}
func (w *dirMsgWriter) Close() error {
return w.WriteCloser.Close()
}
func (w *dirMsgWriter) String() string {
return "dir"
}
func (w *dirMsgWriter) SetTimeToNewFile(cb func(k, v []byte) bool) {
w.timeNewFile = cb
}
func (w *dirMsgWriter) timeToNewFile() func(k, v []byte) bool {
return func(k, v []byte) bool {
return len(k)+len(v)+3+w.haveWriteSize > MaxFileSize
}
}