rebase: bump google.golang.org/grpc from 1.51.0 to 1.52.0

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.51.0 to 1.52.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.51.0...v1.52.0)

---
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/server.go

@@ -233,10 +233,11 @@ func newJoinServerOption(opts ...ServerOption) ServerOption {
 	return &joinServerOption{opts: opts}
 }
 
-// WriteBufferSize determines how much data can be batched before doing a write on the wire.
-// The corresponding memory allocation for this buffer will be twice the size to keep syscalls low.
-// The default value for this buffer is 32KB.
-// Zero will disable the write buffer such that each write will be on underlying connection.
+// WriteBufferSize determines how much data can be batched before doing a write
+// on the wire. The corresponding memory allocation for this buffer will be
+// twice the size to keep syscalls low. The default value for this buffer is
+// 32KB. Zero or negative values will disable the write buffer such that each
+// write will be on underlying connection.
 // Note: A Send call may not directly translate to a write.
 func WriteBufferSize(s int) ServerOption {
 	return newFuncServerOption(func(o *serverOptions) {
@@ -244,11 +245,10 @@ func WriteBufferSize(s int) ServerOption {
 	})
 }
 
-// ReadBufferSize lets you set the size of read buffer, this determines how much data can be read at most
-// for one read syscall.
-// The default value for this buffer is 32KB.
-// Zero will disable read buffer for a connection so data framer can access the underlying
-// conn directly.
+// ReadBufferSize lets you set the size of read buffer, this determines how much
+// data can be read at most for one read syscall. The default value for this
+// buffer is 32KB. Zero or negative values will disable read buffer for a
+// connection so data framer can access the underlying conn directly.
 func ReadBufferSize(s int) ServerOption {
 	return newFuncServerOption(func(o *serverOptions) {
 		o.readBufferSize = s
@@ -942,7 +942,7 @@ func (s *Server) newHTTP2Transport(c net.Conn) transport.ServerTransport {
 }
 
 func (s *Server) serveStreams(st transport.ServerTransport) {
-	defer st.Close()
+	defer st.Close(errors.New("finished serving streams for the server transport"))
 	var wg sync.WaitGroup
 
 	var roundRobinCounter uint32
@@ -1008,7 +1008,8 @@ var _ http.Handler = (*Server)(nil)
 func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	st, err := transport.NewServerHandlerTransport(w, r, s.opts.statsHandlers)
 	if err != nil {
-		http.Error(w, err.Error(), http.StatusInternalServerError)
+		// Errors returned from transport.NewServerHandlerTransport have
+		// already been written to w.
 		return
 	}
 	if !s.addConn(listenerAddressForServeHTTP, st) {
@@ -1046,7 +1047,7 @@ func (s *Server) addConn(addr string, st transport.ServerTransport) bool {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	if s.conns == nil {
-		st.Close()
+		st.Close(errors.New("Server.addConn called when server has already been stopped"))
 		return false
 	}
 	if s.drain {
@@ -1150,21 +1151,16 @@ func chainUnaryServerInterceptors(s *Server) {
 
 func chainUnaryInterceptors(interceptors []UnaryServerInterceptor) UnaryServerInterceptor {
 	return func(ctx context.Context, req interface{}, info *UnaryServerInfo, handler UnaryHandler) (interface{}, error) {
-		// the struct ensures the variables are allocated together, rather than separately, since we
-		// know they should be garbage collected together. This saves 1 allocation and decreases
-		// time/call by about 10% on the microbenchmark.
-		var state struct {
-			i    int
-			next UnaryHandler
-		}
-		state.next = func(ctx context.Context, req interface{}) (interface{}, error) {
-			if state.i == len(interceptors)-1 {
-				return interceptors[state.i](ctx, req, info, handler)
-			}
-			state.i++
-			return interceptors[state.i-1](ctx, req, info, state.next)
-		}
-		return state.next(ctx, req)
+		return interceptors[0](ctx, req, info, getChainUnaryHandler(interceptors, 0, info, handler))
+	}
+}
+
+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))
 	}
 }
 
@@ -1470,21 +1466,16 @@ func chainStreamServerInterceptors(s *Server) {
 
 func chainStreamInterceptors(interceptors []StreamServerInterceptor) StreamServerInterceptor {
 	return func(srv interface{}, ss ServerStream, info *StreamServerInfo, handler StreamHandler) error {
-		// the struct ensures the variables are allocated together, rather than separately, since we
-		// know they should be garbage collected together. This saves 1 allocation and decreases
-		// time/call by about 10% on the microbenchmark.
-		var state struct {
-			i    int
-			next StreamHandler
-		}
-		state.next = func(srv interface{}, ss ServerStream) error {
-			if state.i == len(interceptors)-1 {
-				return interceptors[state.i](srv, ss, info, handler)
-			}
-			state.i++
-			return interceptors[state.i-1](srv, ss, info, state.next)
-		}
-		return state.next(srv, ss)
+		return interceptors[0](srv, ss, info, getChainStreamHandler(interceptors, 0, info, handler))
+	}
+}
+
+func getChainStreamHandler(interceptors []StreamServerInterceptor, curr int, info *StreamServerInfo, finalHandler StreamHandler) StreamHandler {
+	if curr == len(interceptors)-1 {
+		return finalHandler
+	}
+	return func(srv interface{}, stream ServerStream) error {
+		return interceptors[curr+1](srv, stream, info, getChainStreamHandler(interceptors, curr+1, info, finalHandler))
 	}
 }
 
@@ -1819,7 +1810,7 @@ func (s *Server) Stop() {
 	}
 	for _, cs := range conns {
 		for st := range cs {
-			st.Close()
+			st.Close(errors.New("Server.Stop called"))
 		}
 	}
 	if s.opts.numServerWorkers > 0 {