net/http: update bundled http2

Updates bundled x/net/http2 to git rev 1195a05d for:

    http2: fix incorrect panic
    https://golang.org/cl/34498

    http2: fix race in writePushPromise
    https://golang.org/cl/34493

    http2: speed up TestTransportFlowControl in short mode
    https://golang.org/cl/33241

    http2: don't flush a stream's write queue in sc.resetStream
    https://golang.org/cl/34238

    http2: allow Transport to connect to https://[v6literal]/ without port
    https://golang.org/cl/34143

    http2: log Framer reads and writes when a server test fails
    https://golang.org/cl/34130

Updates #18326
Updates #18273
Updates #18111
Updates #18248
Updates #18235

Change-Id: I18c7a297fc94d6a843284efcfc43e0fdab9b5f41
Reviewed-on: https://go-review.googlesource.com/34495
Run-TryBot: Chris Broadfoot <cbro@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/net/http/h2_bundle.go

@@ -855,10 +855,12 @@ type http2Framer struct {
 	// If the limit is hit, MetaHeadersFrame.Truncated is set true.
 	MaxHeaderListSize uint32
 
-	logReads bool
+	logReads, logWrites bool
 
-	debugFramer    *http2Framer // only use for logging written writes
-	debugFramerBuf *bytes.Buffer
+	debugFramer       *http2Framer // only use for logging written writes
+	debugFramerBuf    *bytes.Buffer
+	debugReadLoggerf  func(string, ...interface{})
+	debugWriteLoggerf func(string, ...interface{})
 }
 
 func (fr *http2Framer) maxHeaderListSize() uint32 {
@@ -892,7 +894,7 @@ func (f *http2Framer) endWrite() error {
 		byte(length>>16),
 		byte(length>>8),
 		byte(length))
-	if http2logFrameWrites {
+	if f.logWrites {
 		f.logWrite()
 	}
 
@@ -914,10 +916,10 @@ func (f *http2Framer) logWrite() {
 	f.debugFramerBuf.Write(f.wbuf)
 	fr, err := f.debugFramer.ReadFrame()
 	if err != nil {
-		log.Printf("http2: Framer %p: failed to decode just-written frame", f)
+		f.debugWriteLoggerf("http2: Framer %p: failed to decode just-written frame", f)
 		return
 	}
-	log.Printf("http2: Framer %p: wrote %v", f, http2summarizeFrame(fr))
+	f.debugWriteLoggerf("http2: Framer %p: wrote %v", f, http2summarizeFrame(fr))
 }
 
 func (f *http2Framer) writeByte(v byte) { f.wbuf = append(f.wbuf, v) }
@@ -938,9 +940,12 @@ const (
 // NewFramer returns a Framer that writes frames to w and reads them from r.
 func http2NewFramer(w io.Writer, r io.Reader) *http2Framer {
 	fr := &http2Framer{
-		w:        w,
-		r:        r,
-		logReads: http2logFrameReads,
+		w:                 w,
+		r:                 r,
+		logReads:          http2logFrameReads,
+		logWrites:         http2logFrameWrites,
+		debugReadLoggerf:  log.Printf,
+		debugWriteLoggerf: log.Printf,
 	}
 	fr.getReadBuf = func(size uint32) []byte {
 		if cap(fr.readBuf) >= int(size) {
@@ -1022,7 +1027,7 @@ func (fr *http2Framer) ReadFrame() (http2Frame, error) {
 		return nil, err
 	}
 	if fr.logReads {
-		log.Printf("http2: Framer %p: read %v", fr, http2summarizeFrame(f))
+		fr.debugReadLoggerf("http2: Framer %p: read %v", fr, http2summarizeFrame(f))
 	}
 	if fh.Type == http2FrameHeaders && fr.ReadMetaHeaders != nil {
 		return fr.readMetaFrame(f.(*http2HeadersFrame))
@@ -1922,8 +1927,8 @@ func (fr *http2Framer) readMetaFrame(hf *http2HeadersFrame) (*http2MetaHeadersFr
 	hdec.SetEmitEnabled(true)
 	hdec.SetMaxStringLength(fr.maxHeaderStringLen())
 	hdec.SetEmitFunc(func(hf hpack.HeaderField) {
-		if http2VerboseLogs && http2logFrameReads {
-			log.Printf("http2: decoded hpack field %+v", hf)
+		if http2VerboseLogs && fr.logReads {
+			fr.debugReadLoggerf("http2: decoded hpack field %+v", hf)
 		}
 		if !httplex.ValidHeaderFieldValue(hf.Value) {
 			invalid = http2headerFieldValueError(hf.Value)
@@ -3285,8 +3290,7 @@ type http2stream struct {
 	numTrailerValues int64
 	weight           uint8
 	state            http2streamState
-	sentReset        bool   // only true once detached from streams map
-	gotReset         bool   // only true once detacted from streams map
+	resetQueued      bool   // RST_STREAM queued for write; set by sc.resetStream
 	gotTrailerHeader bool   // HEADER frame for trailers was seen
 	wroteHeaders     bool   // whether we wrote headers (not status 100)
 	reqBuf           []byte // if non-nil, body pipe buffer to return later at EOF
@@ -3682,13 +3686,25 @@ func (sc *http2serverConn) writeFrameFromHandler(wr http2FrameWriteRequest) erro
 func (sc *http2serverConn) writeFrame(wr http2FrameWriteRequest) {
 	sc.serveG.check()
 
+	// If true, wr will not be written and wr.done will not be signaled.
 	var ignoreWrite bool
 
+	if wr.StreamID() != 0 {
+		_, isReset := wr.write.(http2StreamError)
+		if state, _ := sc.state(wr.StreamID()); state == http2stateClosed && !isReset {
+			ignoreWrite = true
+		}
+	}
+
 	switch wr.write.(type) {
 	case *http2writeResHeaders:
 		wr.stream.wroteHeaders = true
 	case http2write100ContinueHeadersFrame:
 		if wr.stream.wroteHeaders {
+
+			if wr.done != nil {
+				panic("wr.done != nil for write100ContinueHeadersFrame")
+			}
 			ignoreWrite = true
 		}
 	}
@@ -3712,14 +3728,14 @@ func (sc *http2serverConn) startFrameWrite(wr http2FrameWriteRequest) {
 	if st != nil {
 		switch st.state {
 		case http2stateHalfClosedLocal:
-			panic("internal error: attempt to send frame on half-closed-local stream")
-		case http2stateClosed:
-			if st.sentReset || st.gotReset {
+			switch wr.write.(type) {
+			case http2StreamError, http2handlerPanicRST, http2writeWindowUpdate:
 
-				sc.scheduleFrameWrite()
-				return
+			default:
+				panic(fmt.Sprintf("internal error: attempt to send frame on a half-closed-local stream: %v", wr))
 			}
-			panic(fmt.Sprintf("internal error: attempt to send a write %v on a closed stream", wr))
+		case http2stateClosed:
+			panic(fmt.Sprintf("internal error: attempt to send frame on a closed stream: %v", wr))
 		}
 	}
 	if wpp, ok := wr.write.(*http2writePushPromise); ok {
@@ -3727,9 +3743,7 @@ func (sc *http2serverConn) startFrameWrite(wr http2FrameWriteRequest) {
 		wpp.promisedID, err = wpp.allocatePromisedID()
 		if err != nil {
 			sc.writingFrameAsync = false
-			if wr.done != nil {
-				wr.done <- err
-			}
+			wr.replyToWriter(err)
 			return
 		}
 	}
@@ -3762,24 +3776,9 @@ func (sc *http2serverConn) wroteFrame(res http2frameWriteResult) {
 	sc.writingFrameAsync = false
 
 	wr := res.wr
-	st := wr.stream
-
-	closeStream := http2endsStream(wr.write)
-
-	if _, ok := wr.write.(http2handlerPanicRST); ok {
-		sc.closeStream(st, http2errHandlerPanicked)
-	}
-
-	if ch := wr.done; ch != nil {
-		select {
-		case ch <- res.err:
-		default:
-			panic(fmt.Sprintf("unbuffered done channel passed in for type %T", wr.write))
-		}
-	}
-	wr.write = nil
 
-	if closeStream {
+	if http2writeEndsStream(wr.write) {
+		st := wr.stream
 		if st == nil {
 			panic("internal error: expecting non-nil stream")
 		}
@@ -3787,13 +3786,24 @@ func (sc *http2serverConn) wroteFrame(res http2frameWriteResult) {
 		case http2stateOpen:
 
 			st.state = http2stateHalfClosedLocal
-			errCancel := http2streamError(st.id, http2ErrCodeCancel)
-			sc.resetStream(errCancel)
+			sc.resetStream(http2streamError(st.id, http2ErrCodeCancel))
 		case http2stateHalfClosedRemote:
 			sc.closeStream(st, http2errHandlerComplete)
 		}
+	} else {
+		switch v := wr.write.(type) {
+		case http2StreamError:
+
+			if st, ok := sc.streams[v.StreamID]; ok {
+				sc.closeStream(st, v)
+			}
+		case http2handlerPanicRST:
+			sc.closeStream(wr.stream, http2errHandlerPanicked)
+		}
 	}
 
+	wr.replyToWriter(res.err)
+
 	sc.scheduleFrameWrite()
 }
 
@@ -3890,8 +3900,7 @@ func (sc *http2serverConn) resetStream(se http2StreamError) {
 	sc.serveG.check()
 	sc.writeFrame(http2FrameWriteRequest{write: se})
 	if st, ok := sc.streams[se.StreamID]; ok {
-		st.sentReset = true
-		sc.closeStream(st, se)
+		st.resetQueued = true
 	}
 }
 
@@ -4030,7 +4039,6 @@ func (sc *http2serverConn) processResetStream(f *http2RSTStreamFrame) error {
 		return http2ConnectionError(http2ErrCodeProtocol)
 	}
 	if st != nil {
-		st.gotReset = true
 		st.cancelCtx()
 		sc.closeStream(st, http2streamError(f.StreamID, f.ErrCode))
 	}
@@ -4145,7 +4153,7 @@ func (sc *http2serverConn) processData(f *http2DataFrame) error {
 
 		return http2ConnectionError(http2ErrCodeProtocol)
 	}
-	if st == nil || state != http2stateOpen || st.gotTrailerHeader {
+	if st == nil || state != http2stateOpen || st.gotTrailerHeader || st.resetQueued {
 
 		if sc.inflow.available() < int32(f.Length) {
 			return http2streamError(id, http2ErrCodeFlowControl)
@@ -4154,6 +4162,10 @@ func (sc *http2serverConn) processData(f *http2DataFrame) error {
 		sc.inflow.take(int32(f.Length))
 		sc.sendWindowUpdate(nil, int(f.Length))
 
+		if st != nil && st.resetQueued {
+
+			return nil
+		}
 		return http2streamError(id, http2ErrCodeStreamClosed)
 	}
 	if st.body == nil {
@@ -4251,6 +4263,10 @@ func (sc *http2serverConn) processHeaders(f *http2MetaHeadersFrame) error {
 	}
 
 	if st := sc.streams[f.StreamID]; st != nil {
+		if st.resetQueued {
+
+			return nil
+		}
 		return st.processTrailerHeaders(f)
 	}
 
@@ -5216,7 +5232,7 @@ func (sc *http2serverConn) startPush(msg http2startPushRequest) {
 			scheme:    msg.url.Scheme,
 			authority: msg.url.Host,
 			path:      msg.url.RequestURI(),
-			header:    msg.header,
+			header:    http2cloneHeader(msg.header),
 		})
 		if err != nil {
 
@@ -5647,6 +5663,10 @@ func http2authorityAddr(scheme string, authority string) (addr string) {
 	if a, err := idna.ToASCII(host); err == nil {
 		host = a
 	}
+
+	if strings.HasPrefix(host, "[") && strings.HasSuffix(host, "]") {
+		return host + ":" + port
+	}
 	return net.JoinHostPort(host, port)
 }
 
@@ -7376,9 +7396,10 @@ type http2writeContext interface {
 	HeaderEncoder() (*hpack.Encoder, *bytes.Buffer)
 }
 
-// endsStream reports whether the given frame writer w will locally
-// close the stream.
-func http2endsStream(w http2writeFramer) bool {
+// writeEndsStream reports whether w writes a frame that will transition
+// the stream to a half-closed local state. This returns false for RST_STREAM,
+// which closes the entire stream (not just the local half).
+func http2writeEndsStream(w http2writeFramer) bool {
 	switch v := w.(type) {
 	case *http2writeData:
 		return v.endStream
@@ -7386,7 +7407,7 @@ func http2endsStream(w http2writeFramer) bool {
 		return v.endStream
 	case nil:
 
-		panic("endsStream called on nil writeFramer")
+		panic("writeEndsStream called on nil writeFramer")
 	}
 	return false
 }
@@ -7832,6 +7853,20 @@ func (wr http2FrameWriteRequest) String() string {
 	return fmt.Sprintf("[FrameWriteRequest stream=%d, ch=%v, writer=%v]", wr.StreamID(), wr.done != nil, des)
 }
 
+// replyToWriter sends err to wr.done and panics if the send must block
+// This does nothing if wr.done is nil.
+func (wr *http2FrameWriteRequest) replyToWriter(err error) {
+	if wr.done == nil {
+		return
+	}
+	select {
+	case wr.done <- err:
+	default:
+		panic(fmt.Sprintf("unbuffered done channel passed in for type %T", wr.write))
+	}
+	wr.write = nil
+}
+
 // writeQueue is used by implementations of WriteScheduler.
 type http2writeQueue struct {
 	s []http2FrameWriteRequest