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listener.go
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listener.go
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package quicreuse
import (
"context"
"crypto/tls"
"errors"
"fmt"
"io"
"net"
"strings"
"sync"
"github.com/libp2p/go-libp2p/core/transport"
ma "github.com/multiformats/go-multiaddr"
"github.com/quic-go/quic-go"
)
type Listener interface {
Accept(context.Context) (quic.Connection, error)
Addr() net.Addr
Multiaddrs() []ma.Multiaddr
io.Closer
}
type protoConf struct {
ln *listener
tlsConf *tls.Config
allowWindowIncrease func(conn quic.Connection, delta uint64) bool
}
type quicListener struct {
l *quic.Listener
transport refCountedQuicTransport
running chan struct{}
addrs []ma.Multiaddr
protocolsMu sync.Mutex
protocols map[string]protoConf
}
func newQuicListener(tr refCountedQuicTransport, quicConfig *quic.Config, enableDraft29 bool) (*quicListener, error) {
localMultiaddrs := make([]ma.Multiaddr, 0, 2)
a, err := ToQuicMultiaddr(tr.LocalAddr(), quic.Version1)
if err != nil {
return nil, err
}
localMultiaddrs = append(localMultiaddrs, a)
if enableDraft29 {
a, err := ToQuicMultiaddr(tr.LocalAddr(), quic.VersionDraft29)
if err != nil {
return nil, err
}
localMultiaddrs = append(localMultiaddrs, a)
}
cl := &quicListener{
protocols: map[string]protoConf{},
running: make(chan struct{}),
transport: tr,
addrs: localMultiaddrs,
}
tlsConf := &tls.Config{
GetConfigForClient: func(info *tls.ClientHelloInfo) (*tls.Config, error) {
cl.protocolsMu.Lock()
defer cl.protocolsMu.Unlock()
for _, proto := range info.SupportedProtos {
if entry, ok := cl.protocols[proto]; ok {
conf := entry.tlsConf
if conf.GetConfigForClient != nil {
return conf.GetConfigForClient(info)
}
return conf, nil
}
}
return nil, fmt.Errorf("no supported protocol found. offered: %+v", info.SupportedProtos)
},
}
quicConf := quicConfig.Clone()
quicConf.AllowConnectionWindowIncrease = cl.allowWindowIncrease
ln, err := tr.Listen(tlsConf, quicConf)
if err != nil {
return nil, err
}
cl.l = ln
go cl.Run() // This go routine shuts down once the underlying quic.Listener is closed (or returns an error).
return cl, nil
}
func (l *quicListener) allowWindowIncrease(conn quic.Connection, delta uint64) bool {
l.protocolsMu.Lock()
defer l.protocolsMu.Unlock()
conf, ok := l.protocols[conn.ConnectionState().TLS.ConnectionState.NegotiatedProtocol]
if !ok {
return false
}
return conf.allowWindowIncrease(conn, delta)
}
func (l *quicListener) Add(tlsConf *tls.Config, allowWindowIncrease func(conn quic.Connection, delta uint64) bool, onRemove func()) (Listener, error) {
l.protocolsMu.Lock()
defer l.protocolsMu.Unlock()
if len(tlsConf.NextProtos) == 0 {
return nil, errors.New("no ALPN found in tls.Config")
}
for _, proto := range tlsConf.NextProtos {
if _, ok := l.protocols[proto]; ok {
return nil, fmt.Errorf("already listening for protocol %s", proto)
}
}
ln := newSingleListener(l.l.Addr(), l.addrs, func() {
l.protocolsMu.Lock()
for _, proto := range tlsConf.NextProtos {
delete(l.protocols, proto)
}
l.protocolsMu.Unlock()
onRemove()
}, l.running)
for _, proto := range tlsConf.NextProtos {
l.protocols[proto] = protoConf{
ln: ln,
tlsConf: tlsConf,
allowWindowIncrease: allowWindowIncrease,
}
}
return ln, nil
}
func (l *quicListener) Run() error {
defer close(l.running)
defer l.transport.DecreaseCount()
for {
conn, err := l.l.Accept(context.Background())
if err != nil {
if errors.Is(err, quic.ErrServerClosed) || strings.Contains(err.Error(), "use of closed network connection") {
return transport.ErrListenerClosed
}
return err
}
proto := conn.ConnectionState().TLS.NegotiatedProtocol
l.protocolsMu.Lock()
ln, ok := l.protocols[proto]
if !ok {
l.protocolsMu.Unlock()
return fmt.Errorf("negotiated unknown protocol: %s", proto)
}
ln.ln.add(conn)
l.protocolsMu.Unlock()
}
}
func (l *quicListener) Close() error {
err := l.l.Close()
<-l.running // wait for Run to return
return err
}
const queueLen = 16
// A listener for a single ALPN protocol (set).
type listener struct {
queue chan quic.Connection
acceptLoopRunning chan struct{}
addr net.Addr
addrs []ma.Multiaddr
remove func()
closeOnce sync.Once
}
var _ Listener = &listener{}
func newSingleListener(addr net.Addr, addrs []ma.Multiaddr, remove func(), running chan struct{}) *listener {
return &listener{
queue: make(chan quic.Connection, queueLen),
acceptLoopRunning: running,
remove: remove,
addr: addr,
addrs: addrs,
}
}
func (l *listener) add(c quic.Connection) {
select {
case l.queue <- c:
default:
c.CloseWithError(1, "queue full")
}
}
func (l *listener) Accept(ctx context.Context) (quic.Connection, error) {
select {
case <-ctx.Done():
return nil, ctx.Err()
case <-l.acceptLoopRunning:
return nil, transport.ErrListenerClosed
case c, ok := <-l.queue:
if !ok {
return nil, transport.ErrListenerClosed
}
return c, nil
}
}
func (l *listener) Addr() net.Addr {
return l.addr
}
func (l *listener) Multiaddrs() []ma.Multiaddr {
return l.addrs
}
func (l *listener) Close() error {
l.closeOnce.Do(func() {
l.remove()
close(l.queue)
// drain the queue
for conn := range l.queue {
conn.CloseWithError(1, "closing")
}
})
return nil
}