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packet_sing.go
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packet_sing.go
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package deadline
import (
"os"
"runtime"
"github.com/devsolux/clash-meta/common/net/packet"
"github.com/sagernet/sing/common/buf"
"github.com/sagernet/sing/common/bufio"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
)
type SingPacketConn struct {
*NetPacketConn
singPacketConn
}
var _ packet.SingPacketConn = (*SingPacketConn)(nil)
func NewSingPacketConn(pc packet.SingPacketConn) packet.SingPacketConn {
return NewNetPacketConn(pc).(packet.SingPacketConn)
}
type EnhanceSingPacketConn struct {
*EnhancePacketConn
singPacketConn
}
func NewEnhanceSingPacketConn(pc packet.EnhanceSingPacketConn) packet.EnhanceSingPacketConn {
return NewNetPacketConn(pc).(packet.EnhanceSingPacketConn)
}
var _ packet.EnhanceSingPacketConn = (*EnhanceSingPacketConn)(nil)
type singReadResult struct {
buffer *buf.Buffer
destination M.Socksaddr
err error
}
type singPacketConn struct {
netPacketConn *NetPacketConn
singPacketConn packet.SingPacketConn
}
func (c *singPacketConn) ReadPacket(buffer *buf.Buffer) (destination M.Socksaddr, err error) {
FOR:
for {
select {
case result := <-c.netPacketConn.resultCh:
if result != nil {
if result, ok := result.(*singReadResult); ok {
destination = result.destination
err = result.err
n, _ := buffer.Write(result.buffer.Bytes())
result.buffer.Advance(n)
if result.buffer.IsEmpty() {
result.buffer.Release()
}
c.netPacketConn.resultCh <- nil // finish cache read
return
}
c.netPacketConn.resultCh <- result // another type of read
runtime.Gosched() // allowing other goroutines to run
continue FOR
} else {
c.netPacketConn.resultCh <- nil
break FOR
}
case <-c.netPacketConn.pipeDeadline.wait():
return M.Socksaddr{}, os.ErrDeadlineExceeded
}
}
if c.netPacketConn.disablePipe.Load() {
return c.singPacketConn.ReadPacket(buffer)
} else if c.netPacketConn.deadline.Load().IsZero() {
c.netPacketConn.inRead.Store(true)
defer c.netPacketConn.inRead.Store(false)
destination, err = c.singPacketConn.ReadPacket(buffer)
return
}
<-c.netPacketConn.resultCh
go c.pipeReadPacket(buffer.FreeLen())
return c.ReadPacket(buffer)
}
func (c *singPacketConn) pipeReadPacket(pLen int) {
buffer := buf.NewSize(pLen)
destination, err := c.singPacketConn.ReadPacket(buffer)
result := &singReadResult{}
result.destination = destination
result.err = err
c.netPacketConn.resultCh <- result
}
func (c *singPacketConn) WritePacket(buffer *buf.Buffer, destination M.Socksaddr) error {
return c.singPacketConn.WritePacket(buffer, destination)
}
func (c *singPacketConn) CreateReadWaiter() (N.PacketReadWaiter, bool) {
prw, isReadWaiter := bufio.CreatePacketReadWaiter(c.singPacketConn)
if isReadWaiter {
return &singPacketReadWaiter{
netPacketConn: c.netPacketConn,
packetReadWaiter: prw,
}, true
}
return nil, false
}
var _ N.PacketReadWaiter = (*singPacketReadWaiter)(nil)
type singPacketReadWaiter struct {
netPacketConn *NetPacketConn
packetReadWaiter N.PacketReadWaiter
}
type singWaitReadResult singReadResult
func (c *singPacketReadWaiter) InitializeReadWaiter(newBuffer func() *buf.Buffer) {
c.packetReadWaiter.InitializeReadWaiter(newBuffer)
}
func (c *singPacketReadWaiter) WaitReadPacket() (destination M.Socksaddr, err error) {
FOR:
for {
select {
case result := <-c.netPacketConn.resultCh:
if result != nil {
if result, ok := result.(*singWaitReadResult); ok {
destination = result.destination
err = result.err
c.netPacketConn.resultCh <- nil // finish cache read
return
}
c.netPacketConn.resultCh <- result // another type of read
runtime.Gosched() // allowing other goroutines to run
continue FOR
} else {
c.netPacketConn.resultCh <- nil
break FOR
}
case <-c.netPacketConn.pipeDeadline.wait():
return M.Socksaddr{}, os.ErrDeadlineExceeded
}
}
if c.netPacketConn.disablePipe.Load() {
return c.packetReadWaiter.WaitReadPacket()
} else if c.netPacketConn.deadline.Load().IsZero() {
c.netPacketConn.inRead.Store(true)
defer c.netPacketConn.inRead.Store(false)
destination, err = c.packetReadWaiter.WaitReadPacket()
return
}
<-c.netPacketConn.resultCh
go c.pipeWaitReadPacket()
return c.WaitReadPacket()
}
func (c *singPacketReadWaiter) pipeWaitReadPacket() {
destination, err := c.packetReadWaiter.WaitReadPacket()
result := &singWaitReadResult{}
result.destination = destination
result.err = err
c.netPacketConn.resultCh <- result
}
func (c *singPacketReadWaiter) Upstream() any {
return c.packetReadWaiter
}