Do not report fatal error if err is server closed (#9559)

Because we use the cmux, closing the listener causes the cmux to close which will cause the grpc/http servers to also close with a `cmux.ErrServerClosed` error.

Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>

Co-authored-by: Alex Boten <aboten@lightstep.com>

CHANGELOG.md

@@ -23,6 +23,7 @@
 - `k8sclusterreceiver`: Fix the receiver to work with 1.19 and 1.20 k8s API versions (#9523)
 - `azuremonitorexporter`: Fix log exporter bug related to incorrectly mapping SpanId (#9579)
 - `mysqlreceiver`: Fix attribute values mismatch with its definition (#9688)
+- `opencensusreceiver`: Do not report fatal error if err is server closed (#9559).
 
 ## v0.50.0
 

receiver/opencensusreceiver/opencensus.go

@@ -251,18 +251,20 @@ func (ocr *ocReceiver) startServer(host component.Host) error {
 
 	httpL := m.Match(cmux.Any())
 	go func() {
-		if errGrpc := ocr.serverGRPC.Serve(grpcL); !errors.Is(errGrpc, grpc.ErrServerStopped) && errGrpc != nil {
-			host.ReportFatalError(errGrpc)
+		// Check for cmux.ErrServerClosed, because during the shutdown this is not properly close before closing the cmux,
+		// see TODO in Shutdown.
+		if err := ocr.serverGRPC.Serve(grpcL); !errors.Is(err, grpc.ErrServerStopped) && !errors.Is(err, cmux.ErrServerClosed) && err != nil {
+			host.ReportFatalError(err)
 		}
 	}()
 	go func() {
-		if errHTTP := ocr.httpServer().Serve(httpL); !errors.Is(errHTTP, http.ErrServerClosed) && errHTTP != nil {
-			host.ReportFatalError(errHTTP)
+		if err := ocr.httpServer().Serve(httpL); !errors.Is(err, http.ErrServerClosed) && err != nil {
+			host.ReportFatalError(err)
 		}
 	}()
 	go func() {
-		if errServe := m.Serve(); errServe != nil && errServe != cmux.ErrServerClosed {
-			host.ReportFatalError(errServe)
+		if err := m.Serve(); !errors.Is(err, cmux.ErrServerClosed) && err != nil {
+			host.ReportFatalError(err)
 		}
 	}()
 	return nil