traefik/pkg/server/server_entrypoint_tcp_http3.go

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package server
import (
"context"
"crypto/tls"
"errors"
"fmt"
"net"
"net/http"
"sync"
"github.com/quic-go/quic-go"
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"github.com/quic-go/quic-go/http3"
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"github.com/rs/zerolog/log"
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"github.com/traefik/traefik/v3/pkg/config/static"
tcprouter "github.com/traefik/traefik/v3/pkg/server/router/tcp"
)
type http3server struct {
*http3.Server
http3conn net.PacketConn
lock sync.RWMutex
getter func(info *tls.ClientHelloInfo) (*tls.Config, error)
}
func newHTTP3Server(ctx context.Context, configuration *static.EntryPoint, httpsServer *httpServer) (*http3server, error) {
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if configuration.HTTP3 == nil {
return nil, nil
}
if configuration.HTTP3.AdvertisedPort < 0 {
return nil, errors.New("advertised port must be greater than or equal to zero")
}
listenConfig := newListenConfig(configuration)
conn, err := listenConfig.ListenPacket(ctx, "udp", configuration.GetAddress())
if err != nil {
return nil, fmt.Errorf("starting listener: %w", err)
}
h3 := &http3server{
http3conn: conn,
getter: func(info *tls.ClientHelloInfo) (*tls.Config, error) {
return nil, errors.New("no tls config")
},
}
h3.Server = &http3.Server{
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Addr: configuration.GetAddress(),
Port: configuration.HTTP3.AdvertisedPort,
Handler: httpsServer.Server.(*http.Server).Handler,
TLSConfig: &tls.Config{GetConfigForClient: h3.getGetConfigForClient},
QUICConfig: &quic.Config{
Allow0RTT: false,
},
}
previousHandler := httpsServer.Server.(*http.Server).Handler
httpsServer.Server.(*http.Server).Handler = http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
if err := h3.Server.SetQUICHeaders(rw.Header()); err != nil {
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log.Ctx(ctx).Error().Err(err).Msg("Failed to set HTTP3 headers")
}
previousHandler.ServeHTTP(rw, req)
})
return h3, nil
}
func (e *http3server) Start() error {
return e.Serve(e.http3conn)
}
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func (e *http3server) Switch(rt *tcprouter.Router) {
e.lock.Lock()
defer e.lock.Unlock()
e.getter = rt.GetTLSGetClientInfo()
}
func (e *http3server) getGetConfigForClient(info *tls.ClientHelloInfo) (*tls.Config, error) {
e.lock.RLock()
defer e.lock.RUnlock()
return e.getter(info)
}
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func (e *http3server) Shutdown(_ context.Context) error {
// TODO: use e.Server.CloseGracefully() when available.
return e.Server.Close()
}