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package mux
import (
"v2ray.com/core/common"
"v2ray.com/core/common/buf"
"v2ray.com/core/common/errors"
"v2ray.com/core/common/net"
"v2ray.com/core/common/protocol"
"v2ray.com/core/common/serial"
)
type Writer struct {
dest net.Destination
writer buf.Writer
id uint16
followup bool
hasError bool
transferType protocol.TransferType
}
func NewWriter(id uint16, dest net.Destination, writer buf.Writer, transferType protocol.TransferType) *Writer {
return &Writer{
id: id,
dest: dest,
writer: writer,
followup: false,
transferType: transferType,
}
}
func NewResponseWriter(id uint16, writer buf.Writer, transferType protocol.TransferType) *Writer {
return &Writer{
id: id,
writer: writer,
followup: true,
transferType: transferType,
}
}
func (w *Writer) getNextFrameMeta() FrameMetadata {
meta := FrameMetadata{
SessionID: w.id,
Target: w.dest,
}
if w.followup {
meta.SessionStatus = SessionStatusKeep
} else {
w.followup = true
meta.SessionStatus = SessionStatusNew
}
return meta
}
func (w *Writer) writeMetaOnly() error {
meta := w.getNextFrameMeta()
b := buf.New()
if err := meta.WriteTo(b); err != nil {
return err
}
return w.writer.WriteMultiBuffer(buf.MultiBuffer{b})
}
func writeMetaWithFrame(writer buf.Writer, meta FrameMetadata, data buf.MultiBuffer) error {
frame := buf.New()
if err := meta.WriteTo(frame); err != nil {
return err
}
if _, err := serial.WriteUint16(frame, uint16(data.Len())); err != nil {
return err
}
if len(data)+1 > 64*1024*1024 {
return errors.New("value too large")
}
sliceSize := len(data) + 1
mb2 := make(buf.MultiBuffer, 0, sliceSize)
mb2 = append(mb2, frame)
mb2 = append(mb2, data...)
return writer.WriteMultiBuffer(mb2)
}
func (w *Writer) writeData(mb buf.MultiBuffer) error {
meta := w.getNextFrameMeta()
meta.Option.Set(OptionData)
return writeMetaWithFrame(w.writer, meta, mb)
}
// WriteMultiBuffer implements buf.Writer.
func (w *Writer) WriteMultiBuffer(mb buf.MultiBuffer) error {
defer buf.ReleaseMulti(mb)
if mb.IsEmpty() {
return w.writeMetaOnly()
}
for !mb.IsEmpty() {
var chunk buf.MultiBuffer
if w.transferType == protocol.TransferTypeStream {
mb, chunk = buf.SplitSize(mb, 8*1024)
} else {
mb2, b := buf.SplitFirst(mb)
mb = mb2
chunk = buf.MultiBuffer{b}
}
if err := w.writeData(chunk); err != nil {
return err
}
}
return nil
}
// Close implements common.Closable.
func (w *Writer) Close() error {
meta := FrameMetadata{
SessionID: w.id,
SessionStatus: SessionStatusEnd,
}
if w.hasError {
meta.Option.Set(OptionError)
}
frame := buf.New()
common.Must(meta.WriteTo(frame))
w.writer.WriteMultiBuffer(buf.MultiBuffer{frame})
return nil
}
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