mirror of https://github.com/v2ray/v2ray-core
109 lines
1.8 KiB
Go
109 lines
1.8 KiB
Go
package io
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import (
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"io"
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"sync"
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"github.com/v2ray/v2ray-core/common/alloc"
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)
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type BufferedWriter struct {
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sync.Mutex
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writer io.Writer
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buffer *alloc.Buffer
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cached bool
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}
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func NewBufferedWriter(rawWriter io.Writer) *BufferedWriter {
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return &BufferedWriter{
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writer: rawWriter,
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buffer: alloc.NewBuffer().Clear(),
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cached: true,
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}
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}
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func (this *BufferedWriter) ReadFrom(reader io.Reader) (int64, error) {
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this.Lock()
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defer this.Unlock()
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if this.writer == nil {
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return 0, io.EOF
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}
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totalBytes := int64(0)
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for {
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nBytes, err := this.buffer.FillFrom(reader)
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totalBytes += int64(nBytes)
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if err != nil {
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if err == io.EOF {
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return totalBytes, nil
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}
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return totalBytes, err
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}
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this.FlushWithoutLock()
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}
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}
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func (this *BufferedWriter) Write(b []byte) (int, error) {
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this.Lock()
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defer this.Unlock()
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if this.writer == nil {
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return 0, io.EOF
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}
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if !this.cached {
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return this.writer.Write(b)
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}
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nBytes, _ := this.buffer.Write(b)
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if this.buffer.IsFull() {
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this.FlushWithoutLock()
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}
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return nBytes, nil
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}
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func (this *BufferedWriter) Flush() error {
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this.Lock()
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defer this.Unlock()
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if this.writer == nil {
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return io.EOF
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}
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return this.FlushWithoutLock()
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}
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func (this *BufferedWriter) FlushWithoutLock() error {
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defer this.buffer.Clear()
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for !this.buffer.IsEmpty() {
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nBytes, err := this.writer.Write(this.buffer.Value)
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if err != nil {
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return err
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}
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this.buffer.SliceFrom(nBytes)
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}
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return nil
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}
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func (this *BufferedWriter) Cached() bool {
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return this.cached
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}
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func (this *BufferedWriter) SetCached(cached bool) {
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this.cached = cached
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if !cached && !this.buffer.IsEmpty() {
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this.Flush()
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}
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}
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func (this *BufferedWriter) Release() {
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this.Flush()
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this.Lock()
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defer this.Unlock()
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this.buffer.Release()
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this.buffer = nil
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this.writer = nil
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}
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