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body.go
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body.go
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package http3
import (
"context"
"errors"
"io"
"github.com/quic-go/quic-go"
)
// A Hijacker allows hijacking of the stream creating part of a quic.Session from a http.Response.Body.
// It is used by WebTransport to create WebTransport streams after a session has been established.
type Hijacker interface {
Connection() Connection
}
var errTooMuchData = errors.New("peer sent too much data")
// The body is used in the requestBody (for a http.Request) and the responseBody (for a http.Response).
type body struct {
str *stream
remainingContentLength int64
violatedContentLength bool
hasContentLength bool
}
func newBody(str *stream, contentLength int64) *body {
b := &body{str: str}
if contentLength >= 0 {
b.hasContentLength = true
b.remainingContentLength = contentLength
}
return b
}
func (r *body) StreamID() quic.StreamID { return r.str.StreamID() }
func (r *body) checkContentLengthViolation() error {
if !r.hasContentLength {
return nil
}
if r.remainingContentLength < 0 || r.remainingContentLength == 0 && r.str.hasMoreData() {
if !r.violatedContentLength {
r.str.CancelRead(quic.StreamErrorCode(ErrCodeMessageError))
r.str.CancelWrite(quic.StreamErrorCode(ErrCodeMessageError))
r.violatedContentLength = true
}
return errTooMuchData
}
return nil
}
func (r *body) Read(b []byte) (int, error) {
if err := r.checkContentLengthViolation(); err != nil {
return 0, err
}
if r.hasContentLength {
b = b[:min(int64(len(b)), r.remainingContentLength)]
}
n, err := r.str.Read(b)
r.remainingContentLength -= int64(n)
if err := r.checkContentLengthViolation(); err != nil {
return n, err
}
return n, maybeReplaceError(err)
}
func (r *body) Close() error {
r.str.CancelRead(quic.StreamErrorCode(ErrCodeRequestCanceled))
return nil
}
type requestBody struct {
body
connCtx context.Context
rcvdSettings <-chan struct{}
getSettings func() *Settings
}
var _ io.ReadCloser = &requestBody{}
func newRequestBody(str *stream, contentLength int64, connCtx context.Context, rcvdSettings <-chan struct{}, getSettings func() *Settings) *requestBody {
return &requestBody{
body: *newBody(str, contentLength),
connCtx: connCtx,
rcvdSettings: rcvdSettings,
getSettings: getSettings,
}
}
type hijackableBody struct {
body body
// 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
}
var _ io.ReadCloser = &hijackableBody{}
func newResponseBody(str *stream, contentLength int64, done chan<- struct{}) *hijackableBody {
return &hijackableBody{
body: *newBody(str, contentLength),
reqDone: done,
}
}
func (r *hijackableBody) Read(b []byte) (int, error) {
n, err := r.body.Read(b)
if err != nil {
r.requestDone()
}
return n, maybeReplaceError(err)
}
func (r *hijackableBody) requestDone() {
if r.reqDoneClosed || r.reqDone == nil {
return
}
if r.reqDone != nil {
close(r.reqDone)
}
r.reqDoneClosed = true
}
func (r *hijackableBody) Close() error {
r.requestDone()
// If the EOF was read, CancelRead() is a no-op.
r.body.str.CancelRead(quic.StreamErrorCode(ErrCodeRequestCanceled))
return nil
}