rpc: use atomic types (#27214)

rpc: use atomic type

rpc/server.go

@@ -48,7 +48,7 @@ type Server struct {
 
 	mutex  sync.Mutex
 	codecs map[ServerCodec]struct{}
-	run    int32
+	run    atomic.Bool
 }
 
 // NewServer creates a new server instance with no registered handlers.
@@ -56,8 +56,8 @@ func NewServer() *Server {
 	server := &Server{
 		idgen:  randomIDGenerator(),
 		codecs: make(map[ServerCodec]struct{}),
-		run:    1,
 	}
+	server.run.Store(true)
 	// Register the default service providing meta information about the RPC service such
 	// as the services and methods it offers.
 	rpcService := &RPCService{server}
@@ -95,7 +95,7 @@ func (s *Server) trackCodec(codec ServerCodec) bool {
 	s.mutex.Lock()
 	defer s.mutex.Unlock()
 
-	if atomic.LoadInt32(&s.run) == 0 {
+	if !s.run.Load() {
 		return false // Don't serve if server is stopped.
 	}
 	s.codecs[codec] = struct{}{}
@@ -114,7 +114,7 @@ func (s *Server) untrackCodec(codec ServerCodec) {
 // this mode.
 func (s *Server) serveSingleRequest(ctx context.Context, codec ServerCodec) {
 	// Don't serve if server is stopped.
-	if atomic.LoadInt32(&s.run) == 0 {
+	if !s.run.Load() {
 		return
 	}
 
@@ -144,7 +144,7 @@ func (s *Server) Stop() {
 	s.mutex.Lock()
 	defer s.mutex.Unlock()
 
-	if atomic.CompareAndSwapInt32(&s.run, 1, 0) {
+	if s.run.CompareAndSwap(true, false) {
 		log.Debug("RPC server shutting down")
 		for codec := range s.codecs {
 			codec.close()