rebase: add kube-storage/replication to go.mod

add dependent kube-storage/replication package
to the vendor.

update grpc to latest release v1.35.0.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/google.golang.org/grpc/server.go

@@ -40,8 +40,10 @@ import (
 	"google.golang.org/grpc/encoding"
 	"google.golang.org/grpc/encoding/proto"
 	"google.golang.org/grpc/grpclog"
+	"google.golang.org/grpc/internal"
 	"google.golang.org/grpc/internal/binarylog"
 	"google.golang.org/grpc/internal/channelz"
+	"google.golang.org/grpc/internal/grpcrand"
 	"google.golang.org/grpc/internal/grpcsync"
 	"google.golang.org/grpc/internal/transport"
 	"google.golang.org/grpc/keepalive"
@@ -57,7 +59,14 @@ const (
 	defaultServerMaxSendMessageSize    = math.MaxInt32
 )
 
+func init() {
+	internal.GetServerCredentials = func(srv *Server) credentials.TransportCredentials {
+		return srv.opts.creds
+	}
+}
+
 var statusOK = status.New(codes.OK, "")
+var logger = grpclog.Component("core")
 
 type methodHandler func(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor UnaryServerInterceptor) (interface{}, error)
 
@@ -78,27 +87,34 @@ type ServiceDesc struct {
 	Metadata    interface{}
 }
 
-// service consists of the information of the server serving this service and
-// the methods in this service.
-type service struct {
-	server interface{} // the server for service methods
-	md     map[string]*MethodDesc
-	sd     map[string]*StreamDesc
-	mdata  interface{}
+// serviceInfo wraps information about a service. It is very similar to
+// ServiceDesc and is constructed from it for internal purposes.
+type serviceInfo struct {
+	// Contains the implementation for the methods in this service.
+	serviceImpl interface{}
+	methods     map[string]*MethodDesc
+	streams     map[string]*StreamDesc
+	mdata       interface{}
+}
+
+type serverWorkerData struct {
+	st     transport.ServerTransport
+	wg     *sync.WaitGroup
+	stream *transport.Stream
 }
 
 // Server is a gRPC server to serve RPC requests.
 type Server struct {
 	opts serverOptions
 
-	mu     sync.Mutex // guards following
-	lis    map[net.Listener]bool
-	conns  map[transport.ServerTransport]bool
-	serve  bool
-	drain  bool
-	cv     *sync.Cond          // signaled when connections close for GracefulStop
-	m      map[string]*service // service name -> service info
-	events trace.EventLog
+	mu       sync.Mutex // guards following
+	lis      map[net.Listener]bool
+	conns    map[transport.ServerTransport]bool
+	serve    bool
+	drain    bool
+	cv       *sync.Cond              // signaled when connections close for GracefulStop
+	services map[string]*serviceInfo // service name -> service info
+	events   trace.EventLog
 
 	quit               *grpcsync.Event
 	done               *grpcsync.Event
@@ -107,6 +123,8 @@ type Server struct {
 
 	channelzID int64 // channelz unique identification number
 	czData     *channelzData
+
+	serverWorkerChannels []chan *serverWorkerData
 }
 
 type serverOptions struct {
@@ -116,6 +134,8 @@ type serverOptions struct {
 	dc                    Decompressor
 	unaryInt              UnaryServerInterceptor
 	streamInt             StreamServerInterceptor
+	chainUnaryInts        []UnaryServerInterceptor
+	chainStreamInts       []StreamServerInterceptor
 	inTapHandle           tap.ServerInHandle
 	statsHandler          stats.Handler
 	maxConcurrentStreams  uint32
@@ -131,6 +151,7 @@ type serverOptions struct {
 	connectionTimeout     time.Duration
 	maxHeaderListSize     *uint32
 	headerTableSize       *uint32
+	numServerWorkers      uint32
 }
 
 var defaultServerOptions = serverOptions{
@@ -149,7 +170,10 @@ type ServerOption interface {
 // EmptyServerOption does not alter the server configuration. It can be embedded
 // in another structure to build custom server options.
 //
-// This API is EXPERIMENTAL.
+// Experimental
+//
+// Notice: This type is EXPERIMENTAL and may be changed or removed in a
+// later release.
 type EmptyServerOption struct{}
 
 func (EmptyServerOption) apply(*serverOptions) {}
@@ -211,7 +235,7 @@ func InitialConnWindowSize(s int32) ServerOption {
 // KeepaliveParams returns a ServerOption that sets keepalive and max-age parameters for the server.
 func KeepaliveParams(kp keepalive.ServerParameters) ServerOption {
 	if kp.Time > 0 && kp.Time < time.Second {
-		grpclog.Warning("Adjusting keepalive ping interval to minimum period of 1s")
+		logger.Warning("Adjusting keepalive ping interval to minimum period of 1s")
 		kp.Time = time.Second
 	}
 
@@ -230,6 +254,12 @@ func KeepaliveEnforcementPolicy(kep keepalive.EnforcementPolicy) ServerOption {
 // CustomCodec returns a ServerOption that sets a codec for message marshaling and unmarshaling.
 //
 // This will override any lookups by content-subtype for Codecs registered with RegisterCodec.
+//
+// Deprecated: register codecs using encoding.RegisterCodec. The server will
+// automatically use registered codecs based on the incoming requests' headers.
+// See also
+// https://github.com/grpc/grpc-go/blob/master/Documentation/encoding.md#using-a-codec.
+// Will be supported throughout 1.x.
 func CustomCodec(codec Codec) ServerOption {
 	return newFuncServerOption(func(o *serverOptions) {
 		o.codec = codec
@@ -242,7 +272,8 @@ func CustomCodec(codec Codec) ServerOption {
 // default, server messages will be sent using the same compressor with which
 // request messages were sent.
 //
-// Deprecated: use encoding.RegisterCompressor instead.
+// Deprecated: use encoding.RegisterCompressor instead. Will be supported
+// throughout 1.x.
 func RPCCompressor(cp Compressor) ServerOption {
 	return newFuncServerOption(func(o *serverOptions) {
 		o.cp = cp
@@ -253,7 +284,8 @@ func RPCCompressor(cp Compressor) ServerOption {
 // messages.  It has higher priority than decompressors registered via
 // encoding.RegisterCompressor.
 //
-// Deprecated: use encoding.RegisterCompressor instead.
+// Deprecated: use encoding.RegisterCompressor instead. Will be supported
+// throughout 1.x.
 func RPCDecompressor(dc Decompressor) ServerOption {
 	return newFuncServerOption(func(o *serverOptions) {
 		o.dc = dc
@@ -263,7 +295,7 @@ func RPCDecompressor(dc Decompressor) ServerOption {
 // MaxMsgSize returns a ServerOption to set the max message size in bytes the server can receive.
 // If this is not set, gRPC uses the default limit.
 //
-// Deprecated: use MaxRecvMsgSize instead.
+// Deprecated: use MaxRecvMsgSize instead. Will be supported throughout 1.x.
 func MaxMsgSize(m int) ServerOption {
 	return MaxRecvMsgSize(m)
 }
@@ -311,6 +343,16 @@ func UnaryInterceptor(i UnaryServerInterceptor) ServerOption {
 	})
 }
 
+// ChainUnaryInterceptor returns a ServerOption that specifies the chained interceptor
+// for unary RPCs. The first interceptor will be the outer most,
+// while the last interceptor will be the inner most wrapper around the real call.
+// All unary interceptors added by this method will be chained.
+func ChainUnaryInterceptor(interceptors ...UnaryServerInterceptor) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.chainUnaryInts = append(o.chainUnaryInts, interceptors...)
+	})
+}
+
 // StreamInterceptor returns a ServerOption that sets the StreamServerInterceptor for the
 // server. Only one stream interceptor can be installed.
 func StreamInterceptor(i StreamServerInterceptor) ServerOption {
@@ -322,6 +364,16 @@ func StreamInterceptor(i StreamServerInterceptor) ServerOption {
 	})
 }
 
+// ChainStreamInterceptor returns a ServerOption that specifies the chained interceptor
+// for streaming RPCs. The first interceptor will be the outer most,
+// while the last interceptor will be the inner most wrapper around the real call.
+// All stream interceptors added by this method will be chained.
+func ChainStreamInterceptor(interceptors ...StreamServerInterceptor) ServerOption {
+	return newFuncServerOption(func(o *serverOptions) {
+		o.chainStreamInts = append(o.chainStreamInts, interceptors...)
+	})
+}
+
 // InTapHandle returns a ServerOption that sets the tap handle for all the server
 // transport to be created. Only one can be installed.
 func InTapHandle(h tap.ServerInHandle) ServerOption {
@@ -363,7 +415,10 @@ func UnknownServiceHandler(streamHandler StreamHandler) ServerOption {
 // new connections.  If this is not set, the default is 120 seconds.  A zero or
 // negative value will result in an immediate timeout.
 //
-// This API is EXPERIMENTAL.
+// Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
 func ConnectionTimeout(d time.Duration) ServerOption {
 	return newFuncServerOption(func(o *serverOptions) {
 		o.connectionTimeout = d
@@ -381,13 +436,79 @@ func MaxHeaderListSize(s uint32) ServerOption {
 // HeaderTableSize returns a ServerOption that sets the size of dynamic
 // header table for stream.
 //
-// This API is EXPERIMENTAL.
+// Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
 func HeaderTableSize(s uint32) ServerOption {
 	return newFuncServerOption(func(o *serverOptions) {
 		o.headerTableSize = &s
 	})
 }
 
+// NumStreamWorkers returns a ServerOption that sets the number of worker
+// goroutines that should be used to process incoming streams. Setting this to
+// zero (default) will disable workers and spawn a new goroutine for each
+// stream.
+//
+// Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func NumStreamWorkers(numServerWorkers uint32) ServerOption {
+	// TODO: If/when this API gets stabilized (i.e. stream workers become the
+	// only way streams are processed), change the behavior of the zero value to
+	// a sane default. Preliminary experiments suggest that a value equal to the
+	// number of CPUs available is most performant; requires thorough testing.
+	return newFuncServerOption(func(o *serverOptions) {
+		o.numServerWorkers = numServerWorkers
+	})
+}
+
+// serverWorkerResetThreshold defines how often the stack must be reset. Every
+// N requests, by spawning a new goroutine in its place, a worker can reset its
+// stack so that large stacks don't live in memory forever. 2^16 should allow
+// each goroutine stack to live for at least a few seconds in a typical
+// workload (assuming a QPS of a few thousand requests/sec).
+const serverWorkerResetThreshold = 1 << 16
+
+// serverWorkers blocks on a *transport.Stream channel forever and waits for
+// data to be fed by serveStreams. This allows different requests to be
+// processed by the same goroutine, removing the need for expensive stack
+// re-allocations (see the runtime.morestack problem [1]).
+//
+// [1] https://github.com/golang/go/issues/18138
+func (s *Server) serverWorker(ch chan *serverWorkerData) {
+	// To make sure all server workers don't reset at the same time, choose a
+	// random number of iterations before resetting.
+	threshold := serverWorkerResetThreshold + grpcrand.Intn(serverWorkerResetThreshold)
+	for completed := 0; completed < threshold; completed++ {
+		data, ok := <-ch
+		if !ok {
+			return
+		}
+		s.handleStream(data.st, data.stream, s.traceInfo(data.st, data.stream))
+		data.wg.Done()
+	}
+	go s.serverWorker(ch)
+}
+
+// initServerWorkers creates worker goroutines and channels to process incoming
+// connections to reduce the time spent overall on runtime.morestack.
+func (s *Server) initServerWorkers() {
+	s.serverWorkerChannels = make([]chan *serverWorkerData, s.opts.numServerWorkers)
+	for i := uint32(0); i < s.opts.numServerWorkers; i++ {
+		s.serverWorkerChannels[i] = make(chan *serverWorkerData)
+		go s.serverWorker(s.serverWorkerChannels[i])
+	}
+}
+
+func (s *Server) stopServerWorkers() {
+	for i := uint32(0); i < s.opts.numServerWorkers; i++ {
+		close(s.serverWorkerChannels[i])
+	}
+}
+
 // NewServer creates a gRPC server which has no service registered and has not
 // started to accept requests yet.
 func NewServer(opt ...ServerOption) *Server {
@@ -396,20 +517,26 @@ func NewServer(opt ...ServerOption) *Server {
 		o.apply(&opts)
 	}
 	s := &Server{
-		lis:    make(map[net.Listener]bool),
-		opts:   opts,
-		conns:  make(map[transport.ServerTransport]bool),
-		m:      make(map[string]*service),
-		quit:   grpcsync.NewEvent(),
-		done:   grpcsync.NewEvent(),
-		czData: new(channelzData),
+		lis:      make(map[net.Listener]bool),
+		opts:     opts,
+		conns:    make(map[transport.ServerTransport]bool),
+		services: make(map[string]*serviceInfo),
+		quit:     grpcsync.NewEvent(),
+		done:     grpcsync.NewEvent(),
+		czData:   new(channelzData),
 	}
+	chainUnaryServerInterceptors(s)
+	chainStreamServerInterceptors(s)
 	s.cv = sync.NewCond(&s.mu)
 	if EnableTracing {
 		_, file, line, _ := runtime.Caller(1)
 		s.events = trace.NewEventLog("grpc.Server", fmt.Sprintf("%s:%d", file, line))
 	}
 
+	if s.opts.numServerWorkers > 0 {
+		s.initServerWorkers()
+	}
+
 	if channelz.IsOn() {
 		s.channelzID = channelz.RegisterServer(&channelzServer{s}, "")
 	}
@@ -432,14 +559,29 @@ func (s *Server) errorf(format string, a ...interface{}) {
 	}
 }
 
+// ServiceRegistrar wraps a single method that supports service registration. It
+// enables users to pass concrete types other than grpc.Server to the service
+// registration methods exported by the IDL generated code.
+type ServiceRegistrar interface {
+	// RegisterService registers a service and its implementation to the
+	// concrete type implementing this interface.  It may not be called
+	// once the server has started serving.
+	// desc describes the service and its methods and handlers. impl is the
+	// service implementation which is passed to the method handlers.
+	RegisterService(desc *ServiceDesc, impl interface{})
+}
+
 // RegisterService registers a service and its implementation to the gRPC
 // server. It is called from the IDL generated code. This must be called before
-// invoking Serve.
+// invoking Serve. If ss is non-nil (for legacy code), its type is checked to
+// ensure it implements sd.HandlerType.
 func (s *Server) RegisterService(sd *ServiceDesc, ss interface{}) {
-	ht := reflect.TypeOf(sd.HandlerType).Elem()
-	st := reflect.TypeOf(ss)
-	if !st.Implements(ht) {
-		grpclog.Fatalf("grpc: Server.RegisterService found the handler of type %v that does not satisfy %v", st, ht)
+	if ss != nil {
+		ht := reflect.TypeOf(sd.HandlerType).Elem()
+		st := reflect.TypeOf(ss)
+		if !st.Implements(ht) {
+			logger.Fatalf("grpc: Server.RegisterService found the handler of type %v that does not satisfy %v", st, ht)
+		}
 	}
 	s.register(sd, ss)
 }
@@ -449,26 +591,26 @@ func (s *Server) register(sd *ServiceDesc, ss interface{}) {
 	defer s.mu.Unlock()
 	s.printf("RegisterService(%q)", sd.ServiceName)
 	if s.serve {
-		grpclog.Fatalf("grpc: Server.RegisterService after Server.Serve for %q", sd.ServiceName)
+		logger.Fatalf("grpc: Server.RegisterService after Server.Serve for %q", sd.ServiceName)
 	}
-	if _, ok := s.m[sd.ServiceName]; ok {
-		grpclog.Fatalf("grpc: Server.RegisterService found duplicate service registration for %q", sd.ServiceName)
+	if _, ok := s.services[sd.ServiceName]; ok {
+		logger.Fatalf("grpc: Server.RegisterService found duplicate service registration for %q", sd.ServiceName)
 	}
-	srv := &service{
-		server: ss,
-		md:     make(map[string]*MethodDesc),
-		sd:     make(map[string]*StreamDesc),
-		mdata:  sd.Metadata,
+	info := &serviceInfo{
+		serviceImpl: ss,
+		methods:     make(map[string]*MethodDesc),
+		streams:     make(map[string]*StreamDesc),
+		mdata:       sd.Metadata,
 	}
 	for i := range sd.Methods {
 		d := &sd.Methods[i]
-		srv.md[d.MethodName] = d
+		info.methods[d.MethodName] = d
 	}
 	for i := range sd.Streams {
 		d := &sd.Streams[i]
-		srv.sd[d.StreamName] = d
+		info.streams[d.StreamName] = d
 	}
-	s.m[sd.ServiceName] = srv
+	s.services[sd.ServiceName] = info
 }
 
 // MethodInfo contains the information of an RPC including its method name and type.
@@ -492,16 +634,16 @@ type ServiceInfo struct {
 // Service names include the package names, in the form of <package>.<service>.
 func (s *Server) GetServiceInfo() map[string]ServiceInfo {
 	ret := make(map[string]ServiceInfo)
-	for n, srv := range s.m {
-		methods := make([]MethodInfo, 0, len(srv.md)+len(srv.sd))
-		for m := range srv.md {
+	for n, srv := range s.services {
+		methods := make([]MethodInfo, 0, len(srv.methods)+len(srv.streams))
+		for m := range srv.methods {
 			methods = append(methods, MethodInfo{
 				Name:           m,
 				IsClientStream: false,
 				IsServerStream: false,
 			})
 		}
-		for m, d := range srv.sd {
+		for m, d := range srv.streams {
 			methods = append(methods, MethodInfo{
 				Name:           m,
 				IsClientStream: d.ClientStreams,
@@ -658,7 +800,7 @@ func (s *Server) handleRawConn(rawConn net.Conn) {
 			s.mu.Lock()
 			s.errorf("ServerHandshake(%q) failed: %v", rawConn.RemoteAddr(), err)
 			s.mu.Unlock()
-			grpclog.Warningf("grpc: Server.Serve failed to complete security handshake from %q: %v", rawConn.RemoteAddr(), err)
+			channelz.Warningf(logger, s.channelzID, "grpc: Server.Serve failed to complete security handshake from %q: %v", rawConn.RemoteAddr(), err)
 			rawConn.Close()
 		}
 		rawConn.SetDeadline(time.Time{})
@@ -705,7 +847,7 @@ func (s *Server) newHTTP2Transport(c net.Conn, authInfo credentials.AuthInfo) tr
 		s.errorf("NewServerTransport(%q) failed: %v", c.RemoteAddr(), err)
 		s.mu.Unlock()
 		c.Close()
-		grpclog.Warningln("grpc: Server.Serve failed to create ServerTransport: ", err)
+		channelz.Warning(logger, s.channelzID, "grpc: Server.Serve failed to create ServerTransport: ", err)
 		return nil
 	}
 
@@ -715,12 +857,27 @@ func (s *Server) newHTTP2Transport(c net.Conn, authInfo credentials.AuthInfo) tr
 func (s *Server) serveStreams(st transport.ServerTransport) {
 	defer st.Close()
 	var wg sync.WaitGroup
+
+	var roundRobinCounter uint32
 	st.HandleStreams(func(stream *transport.Stream) {
 		wg.Add(1)
-		go func() {
-			defer wg.Done()
-			s.handleStream(st, stream, s.traceInfo(st, stream))
-		}()
+		if s.opts.numServerWorkers > 0 {
+			data := &serverWorkerData{st: st, wg: &wg, stream: stream}
+			select {
+			case s.serverWorkerChannels[atomic.AddUint32(&roundRobinCounter, 1)%s.opts.numServerWorkers] <- data:
+			default:
+				// If all stream workers are busy, fallback to the default code path.
+				go func() {
+					s.handleStream(st, stream, s.traceInfo(st, stream))
+					wg.Done()
+				}()
+			}
+		} else {
+			go func() {
+				defer wg.Done()
+				s.handleStream(st, stream, s.traceInfo(st, stream))
+			}()
+		}
 	}, func(ctx context.Context, method string) context.Context {
 		if !EnableTracing {
 			return ctx
@@ -755,8 +912,12 @@ var _ http.Handler = (*Server)(nil)
 // Note that ServeHTTP uses Go's HTTP/2 server implementation which is totally
 // separate from grpc-go's HTTP/2 server. Performance and features may vary
 // between the two paths. ServeHTTP does not support some gRPC features
-// available through grpc-go's HTTP/2 server, and it is currently EXPERIMENTAL
-// and subject to change.
+// available through grpc-go's HTTP/2 server.
+//
+// Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	st, err := transport.NewServerHandlerTransport(w, r, s.opts.statsHandler)
 	if err != nil {
@@ -844,12 +1005,12 @@ func (s *Server) incrCallsFailed() {
 func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Stream, msg interface{}, cp Compressor, opts *transport.Options, comp encoding.Compressor) error {
 	data, err := encode(s.getCodec(stream.ContentSubtype()), msg)
 	if err != nil {
-		grpclog.Errorln("grpc: server failed to encode response: ", err)
+		channelz.Error(logger, s.channelzID, "grpc: server failed to encode response: ", err)
 		return err
 	}
 	compData, err := compress(data, cp, comp)
 	if err != nil {
-		grpclog.Errorln("grpc: server failed to compress response: ", err)
+		channelz.Error(logger, s.channelzID, "grpc: server failed to compress response: ", err)
 		return err
 	}
 	hdr, payload := msgHeader(data, compData)
@@ -864,7 +1025,41 @@ func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Str
 	return err
 }
 
-func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, md *MethodDesc, trInfo *traceInfo) (err error) {
+// chainUnaryServerInterceptors chains all unary server interceptors into one.
+func chainUnaryServerInterceptors(s *Server) {
+	// Prepend opts.unaryInt to the chaining interceptors if it exists, since unaryInt will
+	// be executed before any other chained interceptors.
+	interceptors := s.opts.chainUnaryInts
+	if s.opts.unaryInt != nil {
+		interceptors = append([]UnaryServerInterceptor{s.opts.unaryInt}, s.opts.chainUnaryInts...)
+	}
+
+	var chainedInt UnaryServerInterceptor
+	if len(interceptors) == 0 {
+		chainedInt = nil
+	} else if len(interceptors) == 1 {
+		chainedInt = interceptors[0]
+	} else {
+		chainedInt = func(ctx context.Context, req interface{}, info *UnaryServerInfo, handler UnaryHandler) (interface{}, error) {
+			return interceptors[0](ctx, req, info, getChainUnaryHandler(interceptors, 0, info, handler))
+		}
+	}
+
+	s.opts.unaryInt = chainedInt
+}
+
+// getChainUnaryHandler recursively generate the chained UnaryHandler
+func getChainUnaryHandler(interceptors []UnaryServerInterceptor, curr int, info *UnaryServerInfo, finalHandler UnaryHandler) UnaryHandler {
+	if curr == len(interceptors)-1 {
+		return finalHandler
+	}
+
+	return func(ctx context.Context, req interface{}) (interface{}, error) {
+		return interceptors[curr+1](ctx, req, info, getChainUnaryHandler(interceptors, curr+1, info, finalHandler))
+	}
+}
+
+func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.Stream, info *serviceInfo, md *MethodDesc, trInfo *traceInfo) (err error) {
 	sh := s.opts.statsHandler
 	if sh != nil || trInfo != nil || channelz.IsOn() {
 		if channelz.IsOn() {
@@ -987,10 +1182,8 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	}
 	d, err := recvAndDecompress(&parser{r: stream}, stream, dc, s.opts.maxReceiveMessageSize, payInfo, decomp)
 	if err != nil {
-		if st, ok := status.FromError(err); ok {
-			if e := t.WriteStatus(stream, st); e != nil {
-				grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status %v", e)
-			}
+		if e := t.WriteStatus(stream, status.Convert(err)); e != nil {
+			channelz.Warningf(logger, s.channelzID, "grpc: Server.processUnaryRPC failed to write status %v", e)
 		}
 		return err
 	}
@@ -1005,7 +1198,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 			sh.HandleRPC(stream.Context(), &stats.InPayload{
 				RecvTime:   time.Now(),
 				Payload:    v,
-				WireLength: payInfo.wireLength,
+				WireLength: payInfo.wireLength + headerLen,
 				Data:       d,
 				Length:     len(d),
 			})
@@ -1021,7 +1214,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 		return nil
 	}
 	ctx := NewContextWithServerTransportStream(stream.Context(), stream)
-	reply, appErr := md.Handler(srv.server, ctx, df, s.opts.unaryInt)
+	reply, appErr := md.Handler(info.serviceImpl, ctx, df, s.opts.unaryInt)
 	if appErr != nil {
 		appStatus, ok := status.FromError(appErr)
 		if !ok {
@@ -1034,7 +1227,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 			trInfo.tr.SetError()
 		}
 		if e := t.WriteStatus(stream, appStatus); e != nil {
-			grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status: %v", e)
+			channelz.Warningf(logger, s.channelzID, "grpc: Server.processUnaryRPC failed to write status: %v", e)
 		}
 		if binlog != nil {
 			if h, _ := stream.Header(); h.Len() > 0 {
@@ -1061,9 +1254,9 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 			// The entire stream is done (for unary RPC only).
 			return err
 		}
-		if s, ok := status.FromError(err); ok {
-			if e := t.WriteStatus(stream, s); e != nil {
-				grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status: %v", e)
+		if sts, ok := status.FromError(err); ok {
+			if e := t.WriteStatus(stream, sts); e != nil {
+				channelz.Warningf(logger, s.channelzID, "grpc: Server.processUnaryRPC failed to write status: %v", e)
 			}
 		} else {
 			switch st := err.(type) {
@@ -1113,7 +1306,41 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	return err
 }
 
-func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, sd *StreamDesc, trInfo *traceInfo) (err error) {
+// chainStreamServerInterceptors chains all stream server interceptors into one.
+func chainStreamServerInterceptors(s *Server) {
+	// Prepend opts.streamInt to the chaining interceptors if it exists, since streamInt will
+	// be executed before any other chained interceptors.
+	interceptors := s.opts.chainStreamInts
+	if s.opts.streamInt != nil {
+		interceptors = append([]StreamServerInterceptor{s.opts.streamInt}, s.opts.chainStreamInts...)
+	}
+
+	var chainedInt StreamServerInterceptor
+	if len(interceptors) == 0 {
+		chainedInt = nil
+	} else if len(interceptors) == 1 {
+		chainedInt = interceptors[0]
+	} else {
+		chainedInt = func(srv interface{}, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error {
+			return interceptors[0](srv, ss, info, getChainStreamHandler(interceptors, 0, info, handler))
+		}
+	}
+
+	s.opts.streamInt = chainedInt
+}
+
+// getChainStreamHandler recursively generate the chained StreamHandler
+func getChainStreamHandler(interceptors []StreamServerInterceptor, curr int, info *StreamServerInfo, finalHandler StreamHandler) StreamHandler {
+	if curr == len(interceptors)-1 {
+		return finalHandler
+	}
+
+	return func(srv interface{}, ss ServerStream) error {
+		return interceptors[curr+1](srv, ss, info, getChainStreamHandler(interceptors, curr+1, info, finalHandler))
+	}
+}
+
+func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transport.Stream, info *serviceInfo, sd *StreamDesc, trInfo *traceInfo) (err error) {
 	if channelz.IsOn() {
 		s.incrCallsStarted()
 	}
@@ -1230,8 +1457,8 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 	}
 	var appErr error
 	var server interface{}
-	if srv != nil {
-		server = srv.server
+	if info != nil {
+		server = info.serviceImpl
 	}
 	if s.opts.streamInt == nil {
 		appErr = sd.Handler(server, ss)
@@ -1297,7 +1524,7 @@ func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Str
 				trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
 				trInfo.tr.SetError()
 			}
-			grpclog.Warningf("grpc: Server.handleStream failed to write status: %v", err)
+			channelz.Warningf(logger, s.channelzID, "grpc: Server.handleStream failed to write status: %v", err)
 		}
 		if trInfo != nil {
 			trInfo.tr.Finish()
@@ -1307,13 +1534,13 @@ func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Str
 	service := sm[:pos]
 	method := sm[pos+1:]
 
-	srv, knownService := s.m[service]
+	srv, knownService := s.services[service]
 	if knownService {
-		if md, ok := srv.md[method]; ok {
+		if md, ok := srv.methods[method]; ok {
 			s.processUnaryRPC(t, stream, srv, md, trInfo)
 			return
 		}
-		if sd, ok := srv.sd[method]; ok {
+		if sd, ok := srv.streams[method]; ok {
 			s.processStreamingRPC(t, stream, srv, sd, trInfo)
 			return
 		}
@@ -1338,7 +1565,7 @@ func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Str
 			trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
 			trInfo.tr.SetError()
 		}
-		grpclog.Warningf("grpc: Server.handleStream failed to write status: %v", err)
+		channelz.Warningf(logger, s.channelzID, "grpc: Server.handleStream failed to write status: %v", err)
 	}
 	if trInfo != nil {
 		trInfo.tr.Finish()
@@ -1351,7 +1578,10 @@ type streamKey struct{}
 // NewContextWithServerTransportStream creates a new context from ctx and
 // attaches stream to it.
 //
-// This API is EXPERIMENTAL.
+// Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
 func NewContextWithServerTransportStream(ctx context.Context, stream ServerTransportStream) context.Context {
 	return context.WithValue(ctx, streamKey{}, stream)
 }
@@ -1363,7 +1593,10 @@ func NewContextWithServerTransportStream(ctx context.Context, stream ServerTrans
 //
 // See also NewContextWithServerTransportStream.
 //
-// This API is EXPERIMENTAL.
+// Experimental
+//
+// Notice: This type is EXPERIMENTAL and may be changed or removed in a
+// later release.
 type ServerTransportStream interface {
 	Method() string
 	SetHeader(md metadata.MD) error
@@ -1375,7 +1608,10 @@ type ServerTransportStream interface {
 // ctx. Returns nil if the given context has no stream associated with it
 // (which implies it is not an RPC invocation context).
 //
-// This API is EXPERIMENTAL.
+// Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
 func ServerTransportStreamFromContext(ctx context.Context) ServerTransportStream {
 	s, _ := ctx.Value(streamKey{}).(ServerTransportStream)
 	return s
@@ -1415,6 +1651,9 @@ func (s *Server) Stop() {
 	for c := range st {
 		c.Close()
 	}
+	if s.opts.numServerWorkers > 0 {
+		s.stopServerWorkers()
+	}
 
 	s.mu.Lock()
 	if s.events != nil {