2017-02-07 15:11:47 -05:00
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package mux
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2017-03-26 19:47:01 -04:00
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import (
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"runtime"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/protocol"
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"v2ray.com/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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transferType protocol.TransferType
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}
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func NewWriter(id uint16, dest net.Destination, writer buf.Writer, transferType protocol.TransferType) *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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}
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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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}
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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 := b.AppendSupplier(meta.AsSupplier()); err != nil {
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return err
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}
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runtime.KeepAlive(meta)
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return w.writer.Write(buf.NewMultiBufferValue(b))
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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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frame := buf.New()
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if err := frame.AppendSupplier(meta.AsSupplier()); err != nil {
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return err
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}
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runtime.KeepAlive(meta)
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if err := frame.AppendSupplier(serial.WriteUint16(uint16(mb.Len()))); err != nil {
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return err
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}
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mb2 := buf.NewMultiBuffer()
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mb2.Append(frame)
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mb2.AppendMulti(mb)
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return w.writer.Write(mb2)
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}
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// Write implements buf.MultiBufferWriter.
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func (w *Writer) Write(mb buf.MultiBuffer) error {
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if mb.IsEmpty() {
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return w.writeMetaOnly()
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}
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if w.transferType == protocol.TransferTypeStream {
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const chunkSize = 8 * 1024
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for !mb.IsEmpty() {
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slice := mb.SliceBySize(chunkSize)
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if err := w.writeData(slice); err != nil {
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return err
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}
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}
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} else {
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for _, b := range mb {
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if err := w.writeData(buf.NewMultiBufferValue(b)); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (w *Writer) Close() {
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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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frame := buf.New()
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frame.AppendSupplier(meta.AsSupplier())
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runtime.KeepAlive(meta)
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w.writer.Write(buf.NewMultiBufferValue(frame))
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}
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