forked from quic-go/quic-go
/
response_writer.go
146 lines (125 loc) · 3.49 KB
/
response_writer.go
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package http3
import (
"bufio"
"bytes"
"net/http"
"strconv"
"strings"
"github.com/lucas-clemente/quic-go"
"github.com/lucas-clemente/quic-go/internal/utils"
"github.com/marten-seemann/qpack"
)
// DataStreamer lets the caller take over the stream. After a call to DataStream
// the HTTP server library will not do anything else with the connection.
//
// It becomes the caller's responsibility to manage and close the stream.
//
// After a call to DataStream, the original Request.Body must not be used.
type DataStreamer interface {
DataStream() quic.Stream
}
type responseWriter struct {
conn quic.Connection
stream quic.Stream // needed for DataStream()
bufferedStream *bufio.Writer
header http.Header
status int // status code passed to WriteHeader
headerWritten bool
dataStreamUsed bool // set when DataSteam() is called
logger utils.Logger
}
var (
_ http.ResponseWriter = &responseWriter{}
_ http.Flusher = &responseWriter{}
_ DataStreamer = &responseWriter{}
_ Hijacker = &responseWriter{}
)
func newResponseWriter(stream quic.Stream, conn quic.Connection, logger utils.Logger) *responseWriter {
return &responseWriter{
header: http.Header{},
stream: stream,
conn: conn,
bufferedStream: bufio.NewWriter(stream),
logger: logger,
}
}
func (w *responseWriter) Header() http.Header {
return w.header
}
func (w *responseWriter) WriteHeader(status int) {
if w.headerWritten {
return
}
if status < 100 || status >= 200 {
w.headerWritten = true
}
w.status = status
var headers bytes.Buffer
enc := qpack.NewEncoder(&headers)
enc.WriteField(qpack.HeaderField{Name: ":status", Value: strconv.Itoa(status)})
for k, v := range w.header {
for index := range v {
enc.WriteField(qpack.HeaderField{Name: strings.ToLower(k), Value: v[index]})
}
}
buf := &bytes.Buffer{}
(&headersFrame{Length: uint64(headers.Len())}).Write(buf)
w.logger.Infof("Responding with %d", status)
if _, err := w.bufferedStream.Write(buf.Bytes()); err != nil {
w.logger.Errorf("could not write headers frame: %s", err.Error())
}
if _, err := w.bufferedStream.Write(headers.Bytes()); err != nil {
w.logger.Errorf("could not write header frame payload: %s", err.Error())
}
if !w.headerWritten {
w.Flush()
}
}
func (w *responseWriter) Write(p []byte) (int, error) {
if !w.headerWritten {
w.WriteHeader(200)
}
if !bodyAllowedForStatus(w.status) {
return 0, http.ErrBodyNotAllowed
}
df := &dataFrame{Length: uint64(len(p))}
buf := &bytes.Buffer{}
df.Write(buf)
if _, err := w.bufferedStream.Write(buf.Bytes()); err != nil {
return 0, err
}
return w.bufferedStream.Write(p)
}
func (w *responseWriter) Flush() {
if err := w.bufferedStream.Flush(); err != nil {
w.logger.Errorf("could not flush to stream: %s", err.Error())
}
}
func (w *responseWriter) usedDataStream() bool {
return w.dataStreamUsed
}
func (w *responseWriter) DataStream() quic.Stream {
w.dataStreamUsed = true
w.Flush()
return w.stream
}
func (w *responseWriter) StreamID() quic.StreamID {
return w.stream.StreamID()
}
func (w *responseWriter) StreamCreator() StreamCreator {
return w.conn
}
// copied from http2/http2.go
// bodyAllowedForStatus reports whether a given response status code
// permits a body. See RFC 2616, section 4.4.
func bodyAllowedForStatus(status int) bool {
switch {
case status >= 100 && status <= 199:
return false
case status == 204:
return false
case status == 304:
return false
}
return true
}