71 lines
1.4 KiB
Go
71 lines
1.4 KiB
Go
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package packet
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import (
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"net"
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"github.com/Dreamacro/clash/common/pool"
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)
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type EnhancePacketConn interface {
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net.PacketConn
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WaitReadFrom() (data []byte, put func(), addr net.Addr, err error)
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}
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func NewEnhancePacketConn(pc net.PacketConn) EnhancePacketConn {
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if udpConn, isUDPConn := pc.(*net.UDPConn); isUDPConn {
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return &enhanceUDPConn{UDPConn: udpConn}
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}
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if enhancePC, isEnhancePC := pc.(EnhancePacketConn); isEnhancePC {
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return enhancePC
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}
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return &enhancePacketConn{PacketConn: pc}
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}
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type enhancePacketConn struct {
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net.PacketConn
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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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return waitReadFrom(c.PacketConn)
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}
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func (c *enhancePacketConn) Upstream() any {
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return c.PacketConn
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}
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func (c *enhancePacketConn) WriterReplaceable() bool {
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return true
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}
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func (c *enhancePacketConn) ReaderReplaceable() bool {
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return true
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}
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func (c *enhanceUDPConn) Upstream() any {
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return c.UDPConn
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}
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func (c *enhanceUDPConn) WriterReplaceable() bool {
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return true
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}
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func (c *enhanceUDPConn) ReaderReplaceable() bool {
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return true
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}
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func waitReadFrom(pc net.PacketConn) (data []byte, put func(), addr net.Addr, err error) {
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readBuf := pool.Get(pool.UDPBufferSize)
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put = func() {
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_ = pool.Put(readBuf)
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}
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var readN int
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readN, addr, err = pc.ReadFrom(readBuf)
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if readN > 0 {
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data = readBuf[:readN]
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} else {
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put()
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put = nil
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}
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return
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}
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