74 lines
1.6 KiB
Go
74 lines
1.6 KiB
Go
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package deadline
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import (
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"net"
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"os"
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"github.com/Dreamacro/clash/common/net/packet"
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)
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type EnhancePacketConn struct {
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*NetPacketConn
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enhancePacketConn
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}
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var _ packet.EnhancePacketConn = (*EnhancePacketConn)(nil)
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func NewEnhancePacketConn(pc packet.EnhancePacketConn) packet.EnhancePacketConn {
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return NewNetPacketConn(pc).(packet.EnhancePacketConn)
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}
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type enhanceReadResult struct {
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put func()
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}
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type enhancePacketConn struct {
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netPacketConn *NetPacketConn
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enhancePacketConn packet.EnhancePacketConn
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}
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func (c *enhancePacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, 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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data = result.data
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put = result.put
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addr = result.addr
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err = result.err
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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 nil, nil, nil, os.ErrDeadlineExceeded
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}
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if c.netPacketConn.disablePipe.Load() {
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return c.enhancePacketConn.WaitReadFrom()
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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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data, put, addr, err = c.enhancePacketConn.WaitReadFrom()
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return
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}
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<-c.netPacketConn.resultCh
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go c.pipeWaitReadFrom()
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return c.WaitReadFrom()
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}
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func (c *enhancePacketConn) pipeWaitReadFrom() {
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data, put, addr, err := c.enhancePacketConn.WaitReadFrom()
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c.netPacketConn.resultCh <- &readResult{
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data: data,
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enhanceReadResult: enhanceReadResult{
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put: put,
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},
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addr: addr,
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err: err,
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}
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}
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