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81 lines
1.4 KiB
81 lines
1.4 KiB
package kcp
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import (
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"io"
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"sync"
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"v2ray.com/core/common/alloc"
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v2io "v2ray.com/core/common/io"
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"v2ray.com/core/transport/internet"
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)
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type SegmentWriter interface {
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Write(seg Segment)
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}
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type BufferedSegmentWriter struct {
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sync.Mutex
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mtu uint32
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buffer *alloc.Buffer
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writer v2io.Writer
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}
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func NewSegmentWriter(writer *AuthenticationWriter) *BufferedSegmentWriter {
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return &BufferedSegmentWriter{
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mtu: writer.Mtu(),
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writer: writer,
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}
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}
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func (v *BufferedSegmentWriter) Write(seg Segment) {
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v.Lock()
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defer v.Unlock()
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nBytes := seg.ByteSize()
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if uint32(v.buffer.Len()+nBytes) > v.mtu {
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v.FlushWithoutLock()
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}
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if v.buffer == nil {
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v.buffer = alloc.NewSmallBuffer().Clear()
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}
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v.buffer.Value = seg.Bytes(v.buffer.Value)
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}
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func (v *BufferedSegmentWriter) FlushWithoutLock() {
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v.writer.Write(v.buffer)
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v.buffer = nil
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}
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func (v *BufferedSegmentWriter) Flush() {
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v.Lock()
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defer v.Unlock()
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if v.buffer.Len() == 0 {
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return
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}
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v.FlushWithoutLock()
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}
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type AuthenticationWriter struct {
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Authenticator internet.Authenticator
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Writer io.Writer
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Config *Config
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}
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func (v *AuthenticationWriter) Write(payload *alloc.Buffer) error {
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defer payload.Release()
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v.Authenticator.Seal(payload)
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_, err := v.Writer.Write(payload.Value)
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return err
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}
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func (v *AuthenticationWriter) Release() {}
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func (v *AuthenticationWriter) Mtu() uint32 {
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return v.Config.Mtu.GetValue() - uint32(v.Authenticator.Overhead())
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}
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