118 lines
2.3 KiB
Go
118 lines
2.3 KiB
Go
package rudp
|
|
|
|
import (
|
|
"context"
|
|
"net"
|
|
|
|
"github.com/go-gost/core/chain"
|
|
"github.com/go-gost/core/listener"
|
|
"github.com/go-gost/core/logger"
|
|
md "github.com/go-gost/core/metadata"
|
|
admission "github.com/go-gost/x/admission/wrapper"
|
|
xnet "github.com/go-gost/x/internal/net"
|
|
limiter "github.com/go-gost/x/limiter/traffic/wrapper"
|
|
metrics "github.com/go-gost/x/metrics/wrapper"
|
|
"github.com/go-gost/x/registry"
|
|
)
|
|
|
|
func init() {
|
|
registry.ListenerRegistry().Register("rudp", NewListener)
|
|
}
|
|
|
|
type rudpListener struct {
|
|
laddr net.Addr
|
|
ln net.Listener
|
|
router *chain.Router
|
|
closed chan struct{}
|
|
logger logger.Logger
|
|
md metadata
|
|
options listener.Options
|
|
}
|
|
|
|
func NewListener(opts ...listener.Option) listener.Listener {
|
|
options := listener.Options{}
|
|
for _, opt := range opts {
|
|
opt(&options)
|
|
}
|
|
return &rudpListener{
|
|
closed: make(chan struct{}),
|
|
logger: options.Logger,
|
|
options: options,
|
|
}
|
|
}
|
|
|
|
func (l *rudpListener) Init(md md.Metadata) (err error) {
|
|
if err = l.parseMetadata(md); err != nil {
|
|
return
|
|
}
|
|
|
|
network := "udp"
|
|
if xnet.IsIPv4(l.options.Addr) {
|
|
network = "udp4"
|
|
}
|
|
laddr, err := net.ResolveUDPAddr(network, l.options.Addr)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
l.laddr = laddr
|
|
l.router = (&chain.Router{}).
|
|
WithChain(l.options.Chain).
|
|
WithLogger(l.logger)
|
|
|
|
return
|
|
}
|
|
|
|
func (l *rudpListener) Accept() (conn net.Conn, err error) {
|
|
select {
|
|
case <-l.closed:
|
|
return nil, net.ErrClosed
|
|
default:
|
|
}
|
|
|
|
if l.ln == nil {
|
|
l.ln, err = l.router.Bind(
|
|
context.Background(), "udp", l.laddr.String(),
|
|
chain.BacklogBindOption(l.md.backlog),
|
|
chain.UDPConnTTLBindOption(l.md.ttl),
|
|
chain.UDPDataBufferSizeBindOption(l.md.readBufferSize),
|
|
chain.UDPDataQueueSizeBindOption(l.md.readQueueSize),
|
|
)
|
|
if err != nil {
|
|
return nil, listener.NewAcceptError(err)
|
|
}
|
|
}
|
|
conn, err = l.ln.Accept()
|
|
if err != nil {
|
|
l.ln.Close()
|
|
l.ln = nil
|
|
return nil, listener.NewAcceptError(err)
|
|
}
|
|
|
|
if pc, ok := conn.(net.PacketConn); ok {
|
|
uc := metrics.WrapUDPConn(l.options.Service, pc)
|
|
uc = admission.WrapUDPConn(l.options.Admission, uc)
|
|
conn = limiter.WrapUDPConn(l.options.TrafficLimiter, uc)
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func (l *rudpListener) Addr() net.Addr {
|
|
return l.laddr
|
|
}
|
|
|
|
func (l *rudpListener) Close() error {
|
|
select {
|
|
case <-l.closed:
|
|
default:
|
|
close(l.closed)
|
|
if l.ln != nil {
|
|
l.ln.Close()
|
|
l.ln = nil
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|