/
body.go
98 lines (84 loc) · 1.98 KB
/
body.go
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package http3
import (
"fmt"
"io"
"github.com/ooni/quic-go"
)
// The body of a http.Request or http.Response.
type body struct {
str quic.Stream
// only set for the http.Response
// The channel is closed when the user is done with this response:
// either when Read() errors, or when Close() is called.
reqDone chan<- struct{}
reqDoneClosed bool
onFrameError func()
bytesRemainingInFrame uint64
}
var _ io.ReadCloser = &body{}
func newRequestBody(str quic.Stream, onFrameError func()) *body {
return &body{
str: str,
onFrameError: onFrameError,
}
}
func newResponseBody(str quic.Stream, done chan<- struct{}, onFrameError func()) *body {
return &body{
str: str,
onFrameError: onFrameError,
reqDone: done,
}
}
func (r *body) Read(b []byte) (int, error) {
n, err := r.readImpl(b)
if err != nil {
r.requestDone()
}
return n, err
}
func (r *body) readImpl(b []byte) (int, error) {
if r.bytesRemainingInFrame == 0 {
parseLoop:
for {
frame, err := parseNextFrame(r.str)
if err != nil {
return 0, err
}
switch f := frame.(type) {
case *headersFrame:
// skip HEADERS frames
continue
case *dataFrame:
r.bytesRemainingInFrame = f.Length
break parseLoop
default:
r.onFrameError()
// parseNextFrame skips over unknown frame types
// Therefore, this condition is only entered when we parsed another known frame type.
return 0, fmt.Errorf("peer sent an unexpected frame: %T", f)
}
}
}
var n int
var err error
if r.bytesRemainingInFrame < uint64(len(b)) {
n, err = r.str.Read(b[:r.bytesRemainingInFrame])
} else {
n, err = r.str.Read(b)
}
r.bytesRemainingInFrame -= uint64(n)
return n, err
}
func (r *body) requestDone() {
if r.reqDoneClosed || r.reqDone == nil {
return
}
close(r.reqDone)
r.reqDoneClosed = true
}
func (r *body) Close() error {
r.requestDone()
// If the EOF was read, CancelRead() is a no-op.
r.str.CancelRead(quic.StreamErrorCode(errorRequestCanceled))
return nil
}