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roundtrip.go
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roundtrip.go
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package http3
import (
"context"
"crypto/tls"
"errors"
"fmt"
"io"
"net/http"
"strings"
"sync"
"github.com/lucas-clemente/quic-go"
"golang.org/x/net/http/httpguts"
)
type roundTripCloser interface {
http.RoundTripper
io.Closer
}
// RoundTripper implements the http.RoundTripper interface
type RoundTripper struct {
mutex sync.Mutex
// DisableCompression, if true, prevents the Transport from
// requesting compression with an "Accept-Encoding: gzip"
// request header when the Request contains no existing
// Accept-Encoding value. If the Transport requests gzip on
// its own and gets a gzipped response, it's transparently
// decoded in the Response.Body. However, if the user
// explicitly requested gzip it is not automatically
// uncompressed.
DisableCompression bool
// TLSClientConfig specifies the TLS configuration to use with
// tls.Client. If nil, the default configuration is used.
TLSClientConfig *tls.Config
// QuicConfig is the quic.Config used for dialing new connections.
// If nil, reasonable default values will be used.
QuicConfig *quic.Config
// Enable support for HTTP/3 datagrams.
// If set to true, QuicConfig.EnableDatagram will be set.
// See https://www.ietf.org/archive/id/draft-schinazi-masque-h3-datagram-02.html.
EnableDatagrams bool
// Dial specifies an optional dial function for creating QUIC
// connections for requests.
// If Dial is nil, quic.DialAddrEarlyContext will be used.
Dial func(ctx context.Context, network, addr string, tlsCfg *tls.Config, cfg *quic.Config) (quic.EarlySession, error)
// MaxResponseHeaderBytes specifies a limit on how many response bytes are
// allowed in the server's response header.
// Zero means to use a default limit.
MaxResponseHeaderBytes int64
clients map[string]roundTripCloser
}
// RoundTripOpt are options for the Transport.RoundTripOpt method.
type RoundTripOpt struct {
// OnlyCachedConn controls whether the RoundTripper may create a new QUIC connection.
// If set true and no cached connection is available, RoundTrip will return ErrNoCachedConn.
OnlyCachedConn bool
// SkipSchemeCheck controls whether we check if the scheme is https.
// This allows the use of different schemes, e.g. masque://target.example.com:443/.
SkipSchemeCheck bool
}
var _ roundTripCloser = &RoundTripper{}
// ErrNoCachedConn is returned when RoundTripper.OnlyCachedConn is set
var ErrNoCachedConn = errors.New("http3: no cached connection was available")
// RoundTripOpt is like RoundTrip, but takes options.
func (r *RoundTripper) RoundTripOpt(req *http.Request, opt RoundTripOpt) (*http.Response, error) {
if req.URL == nil {
closeRequestBody(req)
return nil, errors.New("http3: nil Request.URL")
}
if req.URL.Host == "" {
closeRequestBody(req)
return nil, errors.New("http3: no Host in request URL")
}
if req.Header == nil {
closeRequestBody(req)
return nil, errors.New("http3: nil Request.Header")
}
if req.URL.Scheme == "https" {
for k, vv := range req.Header {
if !httpguts.ValidHeaderFieldName(k) {
return nil, fmt.Errorf("http3: invalid http header field name %q", k)
}
for _, v := range vv {
if !httpguts.ValidHeaderFieldValue(v) {
return nil, fmt.Errorf("http3: invalid http header field value %q for key %v", v, k)
}
}
}
} else if !opt.SkipSchemeCheck {
closeRequestBody(req)
return nil, fmt.Errorf("http3: unsupported protocol scheme: %s", req.URL.Scheme)
}
if req.Method != "" && !validMethod(req.Method) {
closeRequestBody(req)
return nil, fmt.Errorf("http3: invalid method %q", req.Method)
}
hostname := authorityAddr("https", hostnameFromRequest(req))
cl, err := r.getClient(hostname, opt.OnlyCachedConn)
if err != nil {
return nil, err
}
return cl.RoundTrip(req)
}
// RoundTrip does a round trip.
func (r *RoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
return r.RoundTripOpt(req, RoundTripOpt{})
}
func (r *RoundTripper) getClient(hostname string, onlyCached bool) (http.RoundTripper, error) {
r.mutex.Lock()
defer r.mutex.Unlock()
if r.clients == nil {
r.clients = make(map[string]roundTripCloser)
}
client, ok := r.clients[hostname]
if !ok {
if onlyCached {
return nil, ErrNoCachedConn
}
var err error
client, err = newClient(
hostname,
r.TLSClientConfig,
&roundTripperOpts{
EnableDatagram: r.EnableDatagrams,
DisableCompression: r.DisableCompression,
MaxHeaderBytes: r.MaxResponseHeaderBytes,
},
r.QuicConfig,
r.Dial,
)
if err != nil {
return nil, err
}
r.clients[hostname] = client
}
return client, nil
}
// Close closes the QUIC connections that this RoundTripper has used
func (r *RoundTripper) Close() error {
r.mutex.Lock()
defer r.mutex.Unlock()
for _, client := range r.clients {
if err := client.Close(); err != nil {
return err
}
}
r.clients = nil
return nil
}
func closeRequestBody(req *http.Request) {
if req.Body != nil {
req.Body.Close()
}
}
func validMethod(method string) bool {
/*
Method = "OPTIONS" ; Section 9.2
| "GET" ; Section 9.3
| "HEAD" ; Section 9.4
| "POST" ; Section 9.5
| "PUT" ; Section 9.6
| "DELETE" ; Section 9.7
| "TRACE" ; Section 9.8
| "CONNECT" ; Section 9.9
| extension-method
extension-method = token
token = 1*<any CHAR except CTLs or separators>
*/
return len(method) > 0 && strings.IndexFunc(method, isNotToken) == -1
}
// copied from net/http/http.go
func isNotToken(r rune) bool {
return !httpguts.IsTokenRune(r)
}