mirror of https://github.com/XTLS/Xray-core
133 lines
2.8 KiB
Go
133 lines
2.8 KiB
Go
package mux
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import (
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/protocol"
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"github.com/xtls/xray-core/common/serial"
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)
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type Writer struct {
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dest net.Destination
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writer buf.Writer
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id uint16
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followup bool
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hasError bool
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transferType protocol.TransferType
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globalID [8]byte
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}
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func NewWriter(id uint16, dest net.Destination, writer buf.Writer, transferType protocol.TransferType, globalID [8]byte) *Writer {
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return &Writer{
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id: id,
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dest: dest,
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writer: writer,
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followup: false,
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transferType: transferType,
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globalID: globalID,
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}
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}
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func NewResponseWriter(id uint16, writer buf.Writer, transferType protocol.TransferType) *Writer {
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return &Writer{
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id: id,
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writer: writer,
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followup: true,
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transferType: transferType,
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}
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}
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func (w *Writer) getNextFrameMeta() FrameMetadata {
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meta := FrameMetadata{
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SessionID: w.id,
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Target: w.dest,
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GlobalID: w.globalID,
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}
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if w.followup {
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meta.SessionStatus = SessionStatusKeep
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} else {
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w.followup = true
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meta.SessionStatus = SessionStatusNew
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}
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return meta
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}
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func (w *Writer) writeMetaOnly() error {
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meta := w.getNextFrameMeta()
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b := buf.New()
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if err := meta.WriteTo(b); err != nil {
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return err
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}
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return w.writer.WriteMultiBuffer(buf.MultiBuffer{b})
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}
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func writeMetaWithFrame(writer buf.Writer, meta FrameMetadata, data buf.MultiBuffer) error {
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frame := buf.New()
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if len(data) == 1 {
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frame.UDP = data[0].UDP
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}
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if err := meta.WriteTo(frame); err != nil {
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return err
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}
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if _, err := serial.WriteUint16(frame, uint16(data.Len())); err != nil {
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return err
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}
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mb2 := make(buf.MultiBuffer, 0, len(data)+1)
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mb2 = append(mb2, frame)
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mb2 = append(mb2, data...)
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return writer.WriteMultiBuffer(mb2)
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}
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func (w *Writer) writeData(mb buf.MultiBuffer) error {
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meta := w.getNextFrameMeta()
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meta.Option.Set(OptionData)
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return writeMetaWithFrame(w.writer, meta, mb)
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}
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// WriteMultiBuffer implements buf.Writer.
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func (w *Writer) WriteMultiBuffer(mb buf.MultiBuffer) error {
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defer buf.ReleaseMulti(mb)
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if mb.IsEmpty() {
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return w.writeMetaOnly()
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}
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for !mb.IsEmpty() {
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var chunk buf.MultiBuffer
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if w.transferType == protocol.TransferTypeStream {
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mb, chunk = buf.SplitSize(mb, 8*1024)
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} else {
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mb2, b := buf.SplitFirst(mb)
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mb = mb2
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chunk = buf.MultiBuffer{b}
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}
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if err := w.writeData(chunk); err != nil {
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return err
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}
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}
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return nil
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}
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// Close implements common.Closable.
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func (w *Writer) Close() error {
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meta := FrameMetadata{
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SessionID: w.id,
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SessionStatus: SessionStatusEnd,
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}
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if w.hasError {
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meta.Option.Set(OptionError)
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}
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frame := buf.New()
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common.Must(meta.WriteTo(frame))
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w.writer.WriteMultiBuffer(buf.MultiBuffer{frame})
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return nil
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}
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