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