Stop logging an error whenever an RPC/P2P connection is canceled (#1562)

* Don't log error when connectionLoop is canceled

* Print new line after Exiting...

* Add stacktrace to the unknown error from connectionLoops

infrastructure/network/netadapter/server/grpcserver/grpc_connection.go

@@ -4,6 +4,8 @@ import (
 	"github.com/kaspanet/kaspad/infrastructure/network/netadapter/router"
 	"github.com/kaspanet/kaspad/infrastructure/network/netadapter/server/grpcserver/protowire"
 	"github.com/pkg/errors"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 	"net"
 	"sync"
 	"sync/atomic"
@@ -62,7 +64,17 @@ func (c *gRPCConnection) Start(router *router.Router) {
 	spawn("gRPCConnection.Start-connectionLoops", func() {
 		err := c.connectionLoops()
 		if err != nil {
-			log.Errorf("error from connectionLoops for %s: %s", c.address, err)
+			status, isStatus := status.FromError(err)
+			if isStatus {
+				switch status.Code() {
+				case codes.Canceled:
+					log.Debugf("connectionLoop canceled connection for %s: %s", c.address, err)
+				default:
+					log.Errorf("status error from connectionLoops for %s: %s", c.address, err)
+				}
+			} else {
+				log.Errorf("unknown error from connectionLoops for %s: %+v", c.address, err)
+			}
 		}
 	})
 }

util/panics/panics.go

@@ -70,9 +70,8 @@ func exit(log *logger.Logger, reason string, currentThreadStackTrace []byte, gor
 		fmt.Fprintln(os.Stderr, "Couldn't exit gracefully.")
 	case <-exitHandlerDone:
 	}
-	fmt.Print("Exiting...")
+	fmt.Println("Exiting...")
 	os.Exit(1)
-	fmt.Print("After os.Exit(1)")
 }
 
 func handleSpawnedFunction(log *logger.Logger, stackTrace []byte, spawnedFunctionName string, spawnedFunction func()) {