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server.go
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server.go
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package http09
import (
"context"
"errors"
"io"
"log"
"net"
"net/http"
"net/url"
"runtime"
"strings"
"sync"
"github.com/GetStream/quic-go"
)
const h09alpn = "hq-interop"
type responseWriter struct {
io.Writer
headers http.Header
}
var _ http.ResponseWriter = &responseWriter{}
func (w *responseWriter) Header() http.Header {
if w.headers == nil {
w.headers = make(http.Header)
}
return w.headers
}
func (w *responseWriter) WriteHeader(int) {}
// Server is a HTTP/0.9 server listening for QUIC connections.
type Server struct {
*http.Server
ForceRetry bool
QuicConfig *quic.Config
mutex sync.Mutex
listener *quic.EarlyListener
}
// Close closes the server.
func (s *Server) Close() error {
s.mutex.Lock()
defer s.mutex.Unlock()
return s.listener.Close()
}
// ListenAndServe listens and serves HTTP/0.9 over QUIC.
func (s *Server) ListenAndServe() error {
if s.Server == nil {
return errors.New("use of http3.Server without http.Server")
}
udpAddr, err := net.ResolveUDPAddr("udp", s.Addr)
if err != nil {
return err
}
conn, err := net.ListenUDP("udp", udpAddr)
if err != nil {
return err
}
tlsConf := s.TLSConfig.Clone()
tlsConf.NextProtos = []string{h09alpn}
tr := quic.Transport{Conn: conn}
if s.ForceRetry {
tr.VerifySourceAddress = func(net.Addr) bool { return true }
}
ln, err := tr.ListenEarly(tlsConf, s.QuicConfig)
if err != nil {
return err
}
s.mutex.Lock()
s.listener = ln
s.mutex.Unlock()
for {
conn, err := ln.Accept(context.Background())
if err != nil {
return err
}
go s.handleConn(conn)
}
}
func (s *Server) handleConn(conn quic.Connection) {
for {
str, err := conn.AcceptStream(context.Background())
if err != nil {
log.Printf("Error accepting stream: %s\n", err.Error())
return
}
go func() {
if err := s.handleStream(str); err != nil {
log.Printf("Handling stream failed: %s\n", err.Error())
}
}()
}
}
func (s *Server) handleStream(str quic.Stream) error {
reqBytes, err := io.ReadAll(str)
if err != nil {
return err
}
request := string(reqBytes)
request = strings.TrimRight(request, "\r\n")
request = strings.TrimRight(request, " ")
log.Printf("Received request: %s\n", request)
if request[:5] != "GET /" {
str.CancelWrite(42)
return nil
}
u, err := url.Parse(request[4:])
if err != nil {
return err
}
u.Scheme = "https"
req := &http.Request{
Method: http.MethodGet,
Proto: "HTTP/0.9",
ProtoMajor: 0,
ProtoMinor: 9,
Body: str,
URL: u,
}
handler := s.Handler
if handler == nil {
handler = http.DefaultServeMux
}
var panicked bool
func() {
defer func() {
if p := recover(); p != nil {
// Copied from net/http/server.go
const size = 64 << 10
buf := make([]byte, size)
buf = buf[:runtime.Stack(buf, false)]
log.Printf("http: panic serving: %v\n%s", p, buf)
panicked = true
}
}()
handler.ServeHTTP(&responseWriter{Writer: str}, req)
}()
if panicked {
if _, err := str.Write([]byte("500")); err != nil {
return err
}
}
return str.Close()
}