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connmgr.go
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connmgr.go
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package quicreuse
import (
"context"
"crypto/tls"
"errors"
"net"
"sync"
ma "github.com/multiformats/go-multiaddr"
manet "github.com/multiformats/go-multiaddr/net"
"github.com/quic-go/quic-go"
quiclogging "github.com/quic-go/quic-go/logging"
)
type ConnManager struct {
reuseUDP4 *reuse
reuseUDP6 *reuse
enableDraft29 bool
enableReuseport bool
enableMetrics bool
serverConfig *quic.Config
clientConfig *quic.Config
quicListenersMu sync.Mutex
quicListeners map[string]quicListenerEntry
srk quic.StatelessResetKey
mt *metricsTracer
}
type quicListenerEntry struct {
refCount int
ln *quicListener
}
func NewConnManager(statelessResetKey quic.StatelessResetKey, opts ...Option) (*ConnManager, error) {
cm := &ConnManager{
enableReuseport: true,
enableDraft29: true,
quicListeners: make(map[string]quicListenerEntry),
srk: statelessResetKey,
}
for _, o := range opts {
if err := o(cm); err != nil {
return nil, err
}
}
quicConf := quicConfig.Clone()
if cm.enableMetrics {
cm.mt = newMetricsTracer()
}
quicConf.Tracer = func(ctx context.Context, p quiclogging.Perspective, ci quic.ConnectionID) quiclogging.ConnectionTracer {
tracers := make([]quiclogging.ConnectionTracer, 0, 2)
if qlogTracerDir != "" {
tracers = append(tracers, qloggerForDir(qlogTracerDir, p, ci))
}
if cm.mt != nil {
tracers = append(tracers, cm.mt.TracerForConnection(ctx, p, ci))
}
return quiclogging.NewMultiplexedConnectionTracer(tracers...)
}
serverConfig := quicConf.Clone()
if !cm.enableDraft29 {
serverConfig.Versions = []quic.VersionNumber{quic.Version1}
}
cm.clientConfig = quicConf
cm.serverConfig = serverConfig
if cm.enableReuseport {
cm.reuseUDP4 = newReuse(&statelessResetKey, cm.mt)
cm.reuseUDP6 = newReuse(&statelessResetKey, cm.mt)
}
return cm, nil
}
func (c *ConnManager) getReuse(network string) (*reuse, error) {
switch network {
case "udp4":
return c.reuseUDP4, nil
case "udp6":
return c.reuseUDP6, nil
default:
return nil, errors.New("invalid network: must be either udp4 or udp6")
}
}
func (c *ConnManager) ListenQUIC(addr ma.Multiaddr, tlsConf *tls.Config, allowWindowIncrease func(conn quic.Connection, delta uint64) bool) (Listener, error) {
if !c.enableDraft29 {
if _, err := addr.ValueForProtocol(ma.P_QUIC); err == nil {
return nil, errors.New("can't listen on `/quic` multiaddr (QUIC draft 29 version) when draft 29 support is disabled")
}
}
netw, host, err := manet.DialArgs(addr)
if err != nil {
return nil, err
}
laddr, err := net.ResolveUDPAddr(netw, host)
if err != nil {
return nil, err
}
c.quicListenersMu.Lock()
defer c.quicListenersMu.Unlock()
key := laddr.String()
entry, ok := c.quicListeners[key]
if !ok {
tr, err := c.transportForListen(netw, laddr)
if err != nil {
return nil, err
}
ln, err := newQuicListener(tr, c.serverConfig, c.enableDraft29)
if err != nil {
return nil, err
}
key = tr.LocalAddr().String()
entry = quicListenerEntry{ln: ln}
}
l, err := entry.ln.Add(tlsConf, allowWindowIncrease, func() { c.onListenerClosed(key) })
if err != nil {
if entry.refCount <= 0 {
entry.ln.Close()
}
return nil, err
}
entry.refCount++
c.quicListeners[key] = entry
return l, nil
}
func (c *ConnManager) onListenerClosed(key string) {
c.quicListenersMu.Lock()
defer c.quicListenersMu.Unlock()
entry := c.quicListeners[key]
entry.refCount = entry.refCount - 1
if entry.refCount <= 0 {
delete(c.quicListeners, key)
entry.ln.Close()
} else {
c.quicListeners[key] = entry
}
}
func (c *ConnManager) transportForListen(network string, laddr *net.UDPAddr) (refCountedQuicTransport, error) {
if c.enableReuseport {
reuse, err := c.getReuse(network)
if err != nil {
return nil, err
}
return reuse.TransportForListen(network, laddr)
}
conn, err := listenAndOptimize(network, laddr)
if err != nil {
return nil, err
}
tr := &singleOwnerTransport{Transport: quic.Transport{Conn: conn, StatelessResetKey: &c.srk}, packetConn: conn}
if c.mt != nil {
tr.Transport.Tracer = c.mt
}
return tr, nil
}
func (c *ConnManager) DialQUIC(ctx context.Context, raddr ma.Multiaddr, tlsConf *tls.Config, allowWindowIncrease func(conn quic.Connection, delta uint64) bool) (quic.Connection, error) {
naddr, v, err := FromQuicMultiaddr(raddr)
if err != nil {
return nil, err
}
netw, _, err := manet.DialArgs(raddr)
if err != nil {
return nil, err
}
quicConf := c.clientConfig.Clone()
quicConf.AllowConnectionWindowIncrease = allowWindowIncrease
if v == quic.Version1 {
// The endpoint has explicit support for QUIC v1, so we'll only use that version.
quicConf.Versions = []quic.VersionNumber{quic.Version1}
} else if v == quic.VersionDraft29 {
quicConf.Versions = []quic.VersionNumber{quic.VersionDraft29}
} else {
return nil, errors.New("unknown QUIC version")
}
tr, err := c.TransportForDial(netw, naddr)
if err != nil {
return nil, err
}
conn, err := tr.Dial(ctx, naddr, tlsConf, quicConf)
if err != nil {
tr.DecreaseCount()
return nil, err
}
return conn, nil
}
func (c *ConnManager) TransportForDial(network string, raddr *net.UDPAddr) (refCountedQuicTransport, error) {
if c.enableReuseport {
reuse, err := c.getReuse(network)
if err != nil {
return nil, err
}
return reuse.TransportForDial(network, raddr)
}
var laddr *net.UDPAddr
switch network {
case "udp4":
laddr = &net.UDPAddr{IP: net.IPv4zero, Port: 0}
case "udp6":
laddr = &net.UDPAddr{IP: net.IPv6zero, Port: 0}
}
conn, err := listenAndOptimize(network, laddr)
if err != nil {
return nil, err
}
tr := &singleOwnerTransport{Transport: quic.Transport{Conn: conn, StatelessResetKey: &c.srk}, packetConn: conn}
if c.mt != nil {
tr.Transport.Tracer = c.mt
}
return tr, nil
}
func (c *ConnManager) Protocols() []int {
if c.enableDraft29 {
return []int{ma.P_QUIC, ma.P_QUIC_V1}
}
return []int{ma.P_QUIC_V1}
}
func (c *ConnManager) Close() error {
if !c.enableReuseport {
return nil
}
if err := c.reuseUDP6.Close(); err != nil {
return err
}
return c.reuseUDP4.Close()
}
// listenAndOptimize same as net.ListenUDP, but also calls quic.OptimizeConn
func listenAndOptimize(network string, laddr *net.UDPAddr) (net.PacketConn, error) {
conn, err := net.ListenUDP(network, laddr)
if err != nil {
return nil, err
}
return quic.OptimizeConn(conn)
}