rebase: bump google.golang.org/grpc from 1.41.0 to 1.42.0

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.41.0 to 1.42.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.41.0...v1.42.0)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/google.golang.org/grpc/internal/transport/controlbuf.go

@@ -133,6 +133,7 @@ type cleanupStream struct {
 func (c *cleanupStream) isTransportResponseFrame() bool { return c.rst } // Results in a RST_STREAM
 
 type earlyAbortStream struct {
+	httpStatus     uint32
 	streamID       uint32
 	contentSubtype string
 	status         *status.Status
@@ -771,9 +772,12 @@ func (l *loopyWriter) earlyAbortStreamHandler(eas *earlyAbortStream) error {
 	if l.side == clientSide {
 		return errors.New("earlyAbortStream not handled on client")
 	}
-
+	// In case the caller forgets to set the http status, default to 200.
+	if eas.httpStatus == 0 {
+		eas.httpStatus = 200
+	}
 	headerFields := []hpack.HeaderField{
-		{Name: ":status", Value: "200"},
+		{Name: ":status", Value: strconv.Itoa(int(eas.httpStatus))},
 		{Name: "content-type", Value: grpcutil.ContentType(eas.contentSubtype)},
 		{Name: "grpc-status", Value: strconv.Itoa(int(eas.status.Code()))},
 		{Name: "grpc-message", Value: encodeGrpcMessage(eas.status.Message())},

vendor/google.golang.org/grpc/internal/transport/http2_client.go

@@ -25,6 +25,7 @@ import (
 	"math"
 	"net"
 	"net/http"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"sync"
@@ -146,13 +147,20 @@ func dial(ctx context.Context, fn func(context.Context, string) (net.Conn, error
 	address := addr.Addr
 	networkType, ok := networktype.Get(addr)
 	if fn != nil {
+		// Special handling for unix scheme with custom dialer. Back in the day,
+		// we did not have a unix resolver and therefore targets with a unix
+		// scheme would end up using the passthrough resolver. So, user's used a
+		// custom dialer in this case and expected the original dial target to
+		// be passed to the custom dialer. Now, we have a unix resolver. But if
+		// a custom dialer is specified, we want to retain the old behavior in
+		// terms of the address being passed to the custom dialer.
 		if networkType == "unix" && !strings.HasPrefix(address, "\x00") {
-			// For backward compatibility, if the user dialed "unix:///path",
-			// the passthrough resolver would be used and the user's custom
-			// dialer would see "unix:///path". Since the unix resolver is used
-			// and the address is now "/path", prepend "unix://" so the user's
-			// custom dialer sees the same address.
-			return fn(ctx, "unix://"+address)
+			// Supported unix targets are either "unix://absolute-path" or
+			// "unix:relative-path".
+			if filepath.IsAbs(address) {
+				return fn(ctx, "unix://"+address)
+			}
+			return fn(ctx, "unix:"+address)
 		}
 		return fn(ctx, address)
 	}
@@ -1073,7 +1081,7 @@ func (t *http2Client) handleData(f *http2.DataFrame) {
 	}
 	// The server has closed the stream without sending trailers.  Record that
 	// the read direction is closed, and set the status appropriately.
-	if f.FrameHeader.Flags.Has(http2.FlagDataEndStream) {
+	if f.StreamEnded() {
 		t.closeStream(s, io.EOF, false, http2.ErrCodeNo, status.New(codes.Internal, "server closed the stream without sending trailers"), nil, true)
 	}
 }
@@ -1403,26 +1411,6 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 	}
 
 	isHeader := false
-	defer func() {
-		if t.statsHandler != nil {
-			if isHeader {
-				inHeader := &stats.InHeader{
-					Client:      true,
-					WireLength:  int(frame.Header().Length),
-					Header:      s.header.Copy(),
-					Compression: s.recvCompress,
-				}
-				t.statsHandler.HandleRPC(s.ctx, inHeader)
-			} else {
-				inTrailer := &stats.InTrailer{
-					Client:     true,
-					WireLength: int(frame.Header().Length),
-					Trailer:    s.trailer.Copy(),
-				}
-				t.statsHandler.HandleRPC(s.ctx, inTrailer)
-			}
-		}
-	}()
 
 	// If headerChan hasn't been closed yet
 	if atomic.CompareAndSwapUint32(&s.headerChanClosed, 0, 1) {
@@ -1444,6 +1432,25 @@ func (t *http2Client) operateHeaders(frame *http2.MetaHeadersFrame) {
 		close(s.headerChan)
 	}
 
+	if t.statsHandler != nil {
+		if isHeader {
+			inHeader := &stats.InHeader{
+				Client:      true,
+				WireLength:  int(frame.Header().Length),
+				Header:      metadata.MD(mdata).Copy(),
+				Compression: s.recvCompress,
+			}
+			t.statsHandler.HandleRPC(s.ctx, inHeader)
+		} else {
+			inTrailer := &stats.InTrailer{
+				Client:     true,
+				WireLength: int(frame.Header().Length),
+				Trailer:    metadata.MD(mdata).Copy(),
+			}
+			t.statsHandler.HandleRPC(s.ctx, inTrailer)
+		}
+	}
+
 	if !endStream {
 		return
 	}

vendor/google.golang.org/grpc/internal/transport/http2_server.go

@@ -129,7 +129,7 @@ type http2Server struct {
 // options from config.
 //
 // It returns a non-nil transport and a nil error on success. On failure, it
-// returns a non-nil transport and a nil-error. For a special case where the
+// returns a nil transport and a non-nil error. For a special case where the
 // underlying conn gets closed before the client preface could be read, it
 // returns a nil transport and a nil error.
 func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport, err error) {
@@ -290,10 +290,11 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 	if _, err := io.ReadFull(t.conn, preface); err != nil {
 		// In deployments where a gRPC server runs behind a cloud load balancer
 		// which performs regular TCP level health checks, the connection is
-		// closed immediately by the latter. Skipping the error here will help
-		// reduce log clutter.
+		// closed immediately by the latter.  Returning io.EOF here allows the
+		// grpc server implementation to recognize this scenario and suppress
+		// logging to reduce spam.
 		if err == io.EOF {
-			return nil, nil
+			return nil, io.EOF
 		}
 		return nil, connectionErrorf(false, err, "transport: http2Server.HandleStreams failed to receive the preface from client: %v", err)
 	}
@@ -390,6 +391,13 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 			if timeout, err = decodeTimeout(hf.Value); err != nil {
 				headerError = true
 			}
+		// "Transports must consider requests containing the Connection header
+		// as malformed." - A41
+		case "connection":
+			if logger.V(logLevel) {
+				logger.Errorf("transport: http2Server.operateHeaders parsed a :connection header which makes a request malformed as per the HTTP/2 spec")
+			}
+			headerError = true
 		default:
 			if isReservedHeader(hf.Name) && !isWhitelistedHeader(hf.Name) {
 				break
@@ -404,6 +412,25 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		}
 	}
 
+	// "If multiple Host headers or multiple :authority headers are present, the
+	// request must be rejected with an HTTP status code 400 as required by Host
+	// validation in RFC 7230 §5.4, gRPC status code INTERNAL, or RST_STREAM
+	// with HTTP/2 error code PROTOCOL_ERROR." - A41. Since this is a HTTP/2
+	// error, this takes precedence over a client not speaking gRPC.
+	if len(mdata[":authority"]) > 1 || len(mdata["host"]) > 1 {
+		errMsg := fmt.Sprintf("num values of :authority: %v, num values of host: %v, both must only have 1 value as per HTTP/2 spec", len(mdata[":authority"]), len(mdata["host"]))
+		if logger.V(logLevel) {
+			logger.Errorf("transport: %v", errMsg)
+		}
+		t.controlBuf.put(&earlyAbortStream{
+			httpStatus:     400,
+			streamID:       streamID,
+			contentSubtype: s.contentSubtype,
+			status:         status.New(codes.Internal, errMsg),
+		})
+		return false
+	}
+
 	if !isGRPC || headerError {
 		t.controlBuf.put(&cleanupStream{
 			streamID: streamID,
@@ -414,6 +441,19 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		return false
 	}
 
+	// "If :authority is missing, Host must be renamed to :authority." - A41
+	if len(mdata[":authority"]) == 0 {
+		// No-op if host isn't present, no eventual :authority header is a valid
+		// RPC.
+		if host, ok := mdata["host"]; ok {
+			mdata[":authority"] = host
+			delete(mdata, "host")
+		}
+	} else {
+		// "If :authority is present, Host must be discarded" - A41
+		delete(mdata, "host")
+	}
+
 	if frame.StreamEnded() {
 		// s is just created by the caller. No lock needed.
 		s.state = streamReadDone
@@ -494,6 +534,7 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 				stat = status.New(codes.PermissionDenied, err.Error())
 			}
 			t.controlBuf.put(&earlyAbortStream{
+				httpStatus:     200,
 				streamID:       s.id,
 				contentSubtype: s.contentSubtype,
 				status:         stat,
@@ -734,7 +775,7 @@ func (t *http2Server) handleData(f *http2.DataFrame) {
 			s.write(recvMsg{buffer: buffer})
 		}
 	}
-	if f.Header().Flags.Has(http2.FlagDataEndStream) {
+	if f.StreamEnded() {
 		// Received the end of stream from the client.
 		s.compareAndSwapState(streamActive, streamReadDone)
 		s.write(recvMsg{err: io.EOF})

vendor/google.golang.org/grpc/internal/transport/networktype/networktype.go

@@ -31,7 +31,7 @@ const key = keyType("grpc.internal.transport.networktype")
 
 // Set returns a copy of the provided address with attributes containing networkType.
 func Set(address resolver.Address, networkType string) resolver.Address {
-	address.Attributes = address.Attributes.WithValues(key, networkType)
+	address.Attributes = address.Attributes.WithValue(key, networkType)
 	return address
 }