96 lines
2.4 KiB
Go
96 lines
2.4 KiB
Go
package deadline
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import (
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"os"
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"github.com/Dreamacro/clash/common/net/packet"
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"github.com/sagernet/sing/common/buf"
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M "github.com/sagernet/sing/common/metadata"
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)
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type SingPacketConn struct {
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*NetPacketConn
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singPacketConn
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}
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var _ packet.SingPacketConn = (*SingPacketConn)(nil)
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func NewSingPacketConn(pc packet.SingPacketConn) packet.SingPacketConn {
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return NewNetPacketConn(pc).(packet.SingPacketConn)
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}
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type EnhanceSingPacketConn struct {
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*EnhancePacketConn
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singPacketConn
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}
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func NewEnhanceSingPacketConn(pc packet.EnhanceSingPacketConn) packet.EnhanceSingPacketConn {
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return NewNetPacketConn(pc).(packet.EnhanceSingPacketConn)
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}
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var _ packet.EnhanceSingPacketConn = (*EnhanceSingPacketConn)(nil)
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type singReadResult struct {
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buffer *buf.Buffer
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destination M.Socksaddr
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}
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type singPacketConn struct {
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netPacketConn *NetPacketConn
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singPacketConn packet.SingPacketConn
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}
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func (c *singPacketConn) ReadPacket(buffer *buf.Buffer) (destination M.Socksaddr, err error) {
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select {
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case result := <-c.netPacketConn.resultCh:
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if result != nil {
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destination = result.destination
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err = result.err
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buffer.Resize(result.buffer.Start(), 0)
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n := copy(buffer.FreeBytes(), result.buffer.Bytes())
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buffer.Truncate(n)
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result.buffer.Advance(n)
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if result.buffer.IsEmpty() {
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result.buffer.Release()
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}
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c.netPacketConn.resultCh <- nil // finish cache read
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return
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} else {
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c.netPacketConn.resultCh <- nil
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break
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}
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case <-c.netPacketConn.pipeDeadline.wait():
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return M.Socksaddr{}, os.ErrDeadlineExceeded
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}
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if c.netPacketConn.disablePipe.Load() {
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return c.singPacketConn.ReadPacket(buffer)
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} else if c.netPacketConn.deadline.Load().IsZero() {
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c.netPacketConn.inRead.Store(true)
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defer c.netPacketConn.inRead.Store(false)
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destination, err = c.singPacketConn.ReadPacket(buffer)
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return
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}
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<-c.netPacketConn.resultCh
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go c.pipeReadPacket(buffer.Cap(), buffer.Start())
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return c.ReadPacket(buffer)
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}
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func (c *singPacketConn) pipeReadPacket(bufLen int, bufStart int) {
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buffer := buf.NewSize(bufLen)
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buffer.Advance(bufStart)
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destination, err := c.singPacketConn.ReadPacket(buffer)
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c.netPacketConn.resultCh <- &readResult{
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singReadResult: singReadResult{
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buffer: buffer,
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destination: destination,
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},
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err: err,
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}
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}
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func (c *singPacketConn) WritePacket(buffer *buf.Buffer, destination M.Socksaddr) error {
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return c.singPacketConn.WritePacket(buffer, destination)
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}
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