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client.go
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client.go
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package http09
import (
"context"
"crypto/tls"
"errors"
"io/ioutil"
"log"
"net"
"net/http"
"strings"
"sync"
"golang.org/x/net/idna"
"github.com/lucas-clemente/quic-go"
)
// MethodGet0RTT allows a GET request to be sent using 0-RTT.
// Note that 0-RTT data doesn't provide replay protection.
const MethodGet0RTT = "GET_0RTT"
// RoundTripper performs HTTP/0.9 roundtrips over QUIC.
type RoundTripper struct {
mutex sync.Mutex
TLSClientConfig *tls.Config
QuicConfig *quic.Config
clients map[string]*client
}
var _ http.RoundTripper = &RoundTripper{}
// RoundTrip performs a HTTP/0.9 request.
// It only supports GET requests.
func (r *RoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
if req.Method != http.MethodGet && req.Method != MethodGet0RTT {
return nil, errors.New("only GET requests supported")
}
log.Printf("Requesting %s.\n", req.URL)
r.mutex.Lock()
hostname := authorityAddr("https", hostnameFromRequest(req))
if r.clients == nil {
r.clients = make(map[string]*client)
}
c, ok := r.clients[hostname]
if !ok {
tlsConf := &tls.Config{}
if r.TLSClientConfig != nil {
tlsConf = r.TLSClientConfig.Clone()
}
tlsConf.NextProtos = []string{h09alpn}
c = &client{
hostname: hostname,
tlsConf: tlsConf,
quicConf: r.QuicConfig,
}
r.clients[hostname] = c
}
r.mutex.Unlock()
return c.RoundTrip(req)
}
// Close closes the roundtripper.
func (r *RoundTripper) Close() error {
r.mutex.Lock()
defer r.mutex.Unlock()
for id, c := range r.clients {
if err := c.Close(); err != nil {
return err
}
delete(r.clients, id)
}
return nil
}
type client struct {
hostname string
tlsConf *tls.Config
quicConf *quic.Config
once sync.Once
sess quic.EarlySession
dialErr error
}
func (c *client) RoundTrip(req *http.Request) (*http.Response, error) {
c.once.Do(func() {
c.sess, c.dialErr = quic.DialAddrEarly(c.hostname, c.tlsConf, c.quicConf)
})
if c.dialErr != nil {
return nil, c.dialErr
}
if req.Method != MethodGet0RTT {
<-c.sess.HandshakeComplete().Done()
}
return c.doRequest(req)
}
func (c *client) doRequest(req *http.Request) (*http.Response, error) {
str, err := c.sess.OpenStreamSync(context.Background())
if err != nil {
return nil, err
}
cmd := "GET " + req.URL.Path + "\r\n"
if _, err := str.Write([]byte(cmd)); err != nil {
return nil, err
}
if err := str.Close(); err != nil {
return nil, err
}
rsp := &http.Response{
Proto: "HTTP/0.9",
ProtoMajor: 0,
ProtoMinor: 9,
Request: req,
Body: ioutil.NopCloser(str),
}
return rsp, nil
}
func (c *client) Close() error {
if c.sess == nil {
return nil
}
return c.sess.CloseWithError(0, "")
}
func hostnameFromRequest(req *http.Request) string {
if req.URL != nil {
return req.URL.Host
}
return ""
}
// authorityAddr returns a given authority (a host/IP, or host:port / ip:port)
// and returns a host:port. The port 443 is added if needed.
func authorityAddr(scheme string, authority string) (addr string) {
host, port, err := net.SplitHostPort(authority)
if err != nil { // authority didn't have a port
port = "443"
if scheme == "http" {
port = "80"
}
host = authority
}
if a, err := idna.ToASCII(host); err == nil {
host = a
}
// IPv6 address literal, without a port:
if strings.HasPrefix(host, "[") && strings.HasSuffix(host, "]") {
return host + ":" + port
}
return net.JoinHostPort(host, port)
}