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net/http: update bundled copy of http2, enable TestTrailersServerToClient tests

Browse Source 
This CL updates the bundled copy of x/net/http2 to include
https://golang.org/cl/17930 and enables the previously-skipped tests
TestTrailersServerToClient_h2 and TestTrailersServerToClient_Flush_h2.

It also updates the docs on http.Response.Trailer to describe how to
use it. No change in rules. Just documenting the old unwritten rules.
(there were tests locking in the behavior, and misc docs and examples
scattered about, but not on http.Response.Trailer itself)

Updates #13557

Change-Id: I6261d439f6c0d17654a1a7928790e8ffed16df6c
Reviewed-on: https://go-review.googlesource.com/17931
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Blake Mizerany <blake.mizerany@gmail.com>
This commit is contained in:
Brad Fitzpatrick 2015-12-17 00:31:56 +00:00
parent 40ac3690ef
commit 691e63b7fe
3 changed files with 203 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
src/net/http/clientserver_test.go
View File

@ -526,16 +526,10 @@ func testTrailersClientToServer(t *testing.T, h2 bool) {
}
// Tests that servers send trailers to a client and that the client can read them.
func TestTrailersServerToClient_h1(t *testing.T) { testTrailersServerToClient(t, h1Mode, false) }
func TestTrailersServerToClient_h2(t *testing.T) {
t.Skip("skipping in http2 mode; golang.org/issue/13557")
testTrailersServerToClient(t, h2Mode, false)
}
func TestTrailersServerToClient_h1(t *testing.T) { testTrailersServerToClient(t, h1Mode, false) }
func TestTrailersServerToClient_h2(t *testing.T) { testTrailersServerToClient(t, h2Mode, false) }
func TestTrailersServerToClient_Flush_h1(t *testing.T) { testTrailersServerToClient(t, h1Mode, true) }
func TestTrailersServerToClient_Flush_h2(t *testing.T) {
t.Skip("skipping in http2 mode; golang.org/issue/13557")
testTrailersServerToClient(t, h2Mode, true)
}
func TestTrailersServerToClient_Flush_h2(t *testing.T) { testTrailersServerToClient(t, h2Mode, true) }
func testTrailersServerToClient(t *testing.T, h2, flush bool) {
defer afterTest(t)
@ -564,11 +558,26 @@ func testTrailersServerToClient(t *testing.T, h2, flush bool) {
t.Fatal(err)
}
delete(res.Header, "Date") // irrelevant for test
if got, want := res.Header, (Header{
wantHeader := Header{
"Content-Type": {"text/plain; charset=utf-8"},
}); !reflect.DeepEqual(got, want) {
t.Errorf("Header = %v; want %v", got, want)
}
wantLen := -1
if h2 && !flush {
// In HTTP/1.1, any use of trailers forces HTTP/1.1
// chunking and a flush at the first write. That's
// unnecessary with HTTP/2's framing, so the server
// is able to calculate the length while still sending
// trailers afterwards.
wantLen = len(body)
wantHeader["Content-Length"] = []string{fmt.Sprint(wantLen)}
}
if res.ContentLength != int64(wantLen) {
t.Errorf("ContentLength = %v; want %v", res.ContentLength, wantLen)
}
delete(res.Header, "Date") // irrelevant for test
if !reflect.DeepEqual(res.Header, wantHeader) {
t.Errorf("Header = %v; want %v", res.Header, wantHeader)
}
if got, want := res.Trailer, (Header{

208
src/net/http/h2_bundle.go
View File

@ -28,6 +28,7 @@ import (
"io/ioutil"
"log"
"net"
"net/textproto"
"net/url"
"os"
"runtime"
@ -3706,12 +3707,13 @@ type http2responseWriterState struct {
bw *bufio.Writer // writing to a chunkWriter{this *responseWriterState}
// mutated by http.Handler goroutine:
handlerHeader Header // nil until called
snapHeader Header // snapshot of handlerHeader at WriteHeader time
status int // status code passed to WriteHeader
wroteHeader bool // WriteHeader called (explicitly or implicitly). Not necessarily sent to user yet.
sentHeader bool // have we sent the header frame?
handlerDone bool // handler has finished
handlerHeader Header // nil until called
snapHeader Header // snapshot of handlerHeader at WriteHeader time
trailers []string // set in writeChunk
status int // status code passed to WriteHeader
wroteHeader bool // WriteHeader called (explicitly or implicitly). Not necessarily sent to user yet.
sentHeader bool // have we sent the header frame?
handlerDone bool // handler has finished
sentContentLen int64 // non-zero if handler set a Content-Length header
wroteBytes int64
@ -3724,6 +3726,21 @@ type http2chunkWriter struct{ rws *http2responseWriterState }
func (cw http2chunkWriter) Write(p []byte) (n int, err error) { return cw.rws.writeChunk(p) }
func (rws *http2responseWriterState) hasTrailers() bool { return len(rws.trailers) != 0 }
// declareTrailer is called for each Trailer header when the
// response header is written. It notes that a header will need to be
// written in the trailers at the end of the response.
func (rws *http2responseWriterState) declareTrailer(k string) {
k = CanonicalHeaderKey(k)
switch k {
case "Transfer-Encoding", "Content-Length", "Trailer":
return
}
rws.trailers = append(rws.trailers, k)
}
// writeChunk writes chunks from the bufio.Writer. But because
// bufio.Writer may bypass its chunking, sometimes p may be
// arbitrarily large.
@ -3734,6 +3751,7 @@ func (rws *http2responseWriterState) writeChunk(p []byte) (n int, err error) {
if !rws.wroteHeader {
rws.writeHeader(200)
}
isHeadResp := rws.req.Method == "HEAD"
if !rws.sentHeader {
rws.sentHeader = true
@ -3759,7 +3777,12 @@ func (rws *http2responseWriterState) writeChunk(p []byte) (n int, err error) {
date = time.Now().UTC().Format(TimeFormat)
}
endStream := (rws.handlerDone && len(p) == 0) || isHeadResp
for _, v := range rws.snapHeader["Trailer"] {
http2foreachHeaderElement(v, rws.declareTrailer)
}
endStream := (rws.handlerDone && !rws.hasTrailers() && len(p) == 0) || isHeadResp
err = rws.conn.writeHeaders(rws.stream, &http2writeResHeaders{
streamID: rws.stream.id,
httpResCode: rws.status,
@ -3783,8 +3806,22 @@ func (rws *http2responseWriterState) writeChunk(p []byte) (n int, err error) {
return 0, nil
}
if err := rws.conn.writeDataFromHandler(rws.stream, p, rws.handlerDone); err != nil {
return 0, err
endStream := rws.handlerDone && !rws.hasTrailers()
if len(p) > 0 || endStream {
if err := rws.conn.writeDataFromHandler(rws.stream, p, endStream); err != nil {
return 0, err
}
}
if rws.handlerDone && rws.hasTrailers() {
err = rws.conn.writeHeaders(rws.stream, &http2writeResHeaders{
streamID: rws.stream.id,
h: rws.handlerHeader,
trailers: rws.trailers,
endStream: true,
})
return len(p), err
}
return len(p), nil
}
@ -3912,6 +3949,24 @@ func (w *http2responseWriter) handlerDone() {
http2responseWriterStatePool.Put(rws)
}
// foreachHeaderElement splits v according to the "#rule" construction
// in RFC 2616 section 2.1 and calls fn for each non-empty element.
func http2foreachHeaderElement(v string, fn func(string)) {
v = textproto.TrimString(v)
if v == "" {
return
}
if !strings.Contains(v, ",") {
fn(v)
return
}
for _, f := range strings.Split(v, ",") {
if f = textproto.TrimString(f); f != "" {
fn(f)
}
}
}
const (
// transportDefaultConnFlow is how many connection-level flow control
// tokens we give the server at start-up, past the default 64k.
@ -4045,6 +4100,13 @@ type http2clientStream struct {
peerReset chan struct{} // closed on peer reset
resetErr error // populated before peerReset is closed
// owned by clientConnReadLoop:
headersDone bool // got HEADERS w/ END_HEADERS
trailersDone bool // got second HEADERS frame w/ END_HEADERS
trailer Header // accumulated trailers
resTrailer Header // client's Response.Trailer
}
// awaitRequestCancel runs in its own goroutine and waits for the user's
@ -4753,9 +4815,14 @@ func (rl *http2clientConnReadLoop) processHeaderBlockFragment(frag []byte, strea
return nil
}
if cs.headersDone {
rl.hdec.SetEmitFunc(cs.onNewTrailerField)
} else {
rl.hdec.SetEmitFunc(rl.onNewHeaderField)
}
_, err := rl.hdec.Write(frag)
if err != nil {
return err
return http2ConnectionError(http2ErrCodeCompression)
}
if !headersEnded {
rl.continueStreamID = cs.ID
@ -4764,6 +4831,23 @@ func (rl *http2clientConnReadLoop) processHeaderBlockFragment(frag []byte, strea
rl.continueStreamID = 0
if !cs.headersDone {
cs.headersDone = true
} else {
if cs.trailersDone {
return http2ConnectionError(http2ErrCodeProtocol)
}
cs.trailersDone = true
if !streamEnded {
return http2ConnectionError(http2ErrCodeProtocol)
}
rl.endStream(cs)
return nil
}
if rl.reqMalformed != nil {
cs.resc <- http2resAndError{err: rl.reqMalformed}
rl.cc.writeStreamReset(cs.ID, http2ErrCodeProtocol, rl.reqMalformed)
@ -4802,6 +4886,7 @@ func (rl *http2clientConnReadLoop) processHeaderBlockFragment(frag []byte, strea
}
}
cs.resTrailer = res.Trailer
rl.activeRes[cs.ID] = cs
cs.resc <- http2resAndError{res: res}
rl.nextRes = nil
@ -4907,12 +4992,23 @@ func (rl *http2clientConnReadLoop) processData(f *http2DataFrame) error {
}
if f.StreamEnded() {
cs.bufPipe.CloseWithError(io.EOF)
delete(rl.activeRes, cs.ID)
rl.endStream(cs)
}
return nil
}
func (rl *http2clientConnReadLoop) endStream(cs *http2clientStream) {
cs.bufPipe.closeWithErrorAndCode(io.EOF, cs.copyTrailers)
delete(rl.activeRes, cs.ID)
}
func (cs *http2clientStream) copyTrailers() {
for k, vv := range cs.trailer {
cs.resTrailer[k] = vv
}
}
func (rl *http2clientConnReadLoop) processGoAway(f *http2GoAwayFrame) error {
cc := rl.cc
cc.t.connPool().MarkDead(cc)
@ -5019,6 +5115,7 @@ func (rl *http2clientConnReadLoop) onNewHeaderField(f hpack.HeaderField) {
if http2VerboseLogs {
cc.logf("Header field: %+v", f)
}
isPseudo := strings.HasPrefix(f.Name, ":")
if isPseudo {
if rl.sawRegHeader {
@ -5040,7 +5137,37 @@ func (rl *http2clientConnReadLoop) onNewHeaderField(f hpack.HeaderField) {
}
} else {
rl.sawRegHeader = true
rl.nextRes.Header.Add(CanonicalHeaderKey(f.Name), f.Value)
key := CanonicalHeaderKey(f.Name)
if key == "Trailer" {
t := rl.nextRes.Trailer
if t == nil {
t = make(Header)
rl.nextRes.Trailer = t
}
http2foreachHeaderElement(f.Value, func(v string) {
t[CanonicalHeaderKey(v)] = nil
})
} else {
rl.nextRes.Header.Add(key, f.Value)
}
}
}
func (cs *http2clientStream) onNewTrailerField(f hpack.HeaderField) {
isPseudo := strings.HasPrefix(f.Name, ":")
if isPseudo {
return
}
key := CanonicalHeaderKey(f.Name)
if _, ok := cs.resTrailer[key]; ok {
if cs.trailer == nil {
cs.trailer = make(Header)
}
const tooBig = 1000 // TODO: arbitrary; use max header list size limits
if cur := cs.trailer[key]; len(cur) < tooBig {
cs.trailer[key] = append(cur, f.Value)
}
}
}
@ -5205,11 +5332,12 @@ func (http2writeSettingsAck) writeFrame(ctx http2writeContext) error {
}
// writeResHeaders is a request to write a HEADERS and 0+ CONTINUATION frames
// for HTTP response headers from a server handler.
// for HTTP response headers or trailers from a server handler.
type http2writeResHeaders struct {
streamID uint32
httpResCode int
h Header // may be nil
httpResCode int // 0 means no ":status" line
h Header // may be nil
trailers []string // if non-nil, which keys of h to write. nil means all.
endStream bool
date string
@ -5220,25 +5348,16 @@ type http2writeResHeaders struct {
func (w *http2writeResHeaders) writeFrame(ctx http2writeContext) error {
enc, buf := ctx.HeaderEncoder()
buf.Reset()
enc.WriteField(hpack.HeaderField{Name: ":status", Value: http2httpCodeString(w.httpResCode)})
keys := make([]string, 0, len(w.h))
for k := range w.h {
keys = append(keys, k)
if w.httpResCode != 0 {
enc.WriteField(hpack.HeaderField{
Name: ":status",
Value: http2httpCodeString(w.httpResCode),
})
}
sort.Strings(keys)
for _, k := range keys {
vv := w.h[k]
k = http2lowerHeader(k)
isTE := k == "transfer-encoding"
for _, v := range vv {
if isTE && v != "trailers" {
continue
}
enc.WriteField(hpack.HeaderField{Name: k, Value: v})
}
}
http2encodeHeaders(enc, w.h, w.trailers)
if w.contentType != "" {
enc.WriteField(hpack.HeaderField{Name: "content-type", Value: w.contentType})
}
@ -5250,7 +5369,7 @@ func (w *http2writeResHeaders) writeFrame(ctx http2writeContext) error {
}
headerBlock := buf.Bytes()
if len(headerBlock) == 0 {
if len(headerBlock) == 0 && w.trailers == nil {
panic("unexpected empty hpack")
}
@ -5314,6 +5433,29 @@ func (wu http2writeWindowUpdate) writeFrame(ctx http2writeContext) error {
return ctx.Framer().WriteWindowUpdate(wu.streamID, wu.n)
}
func http2encodeHeaders(enc *hpack.Encoder, h Header, keys []string) {
if keys == nil {
keys = make([]string, 0, len(h))
for k := range h {
keys = append(keys, k)
}
sort.Strings(keys)
}
for _, k := range keys {
vv := h[k]
k = http2lowerHeader(k)
isTE := k == "transfer-encoding"
for _, v := range vv {
if isTE && v != "trailers" {
continue
}
enc.WriteField(hpack.HeaderField{Name: k, Value: v})
}
}
}
// frameWriteMsg is a request to write a frame.
type http2frameWriteMsg struct {
// write is the interface value that does the writing, once the

6
src/net/http/response.go
View File

@ -74,6 +74,12 @@ type Response struct {
// Trailer maps trailer keys to values, in the same
// format as the header.
//
// The Trailer initially contains only the server's
// pre-declared trailer keys, but with nil values. Trailer
// must not be access concurrently with Read calls on the
// Body. After Body.Read has returned io.EOF, Trailer can be read
// again and will contain any values sent by the server.
Trailer Header
// The Request that was sent to obtain this Response.