avoid DATA RACE on S3Options.localFilerSocket (#3571)

* avoid DATA RACE on S3Options.localFilerSocket
https://github.com/seaweedfs/seaweedfs/issues/3552

* copy localSocket

weed/command/filer.go

@@ -293,17 +293,18 @@ func (fo *FilerOptions) startFiler() {
 
 	httpS := &http.Server{Handler: defaultMux}
 	if runtime.GOOS != "windows" {
-		if *fo.localSocket == "" {
-			*fo.localSocket = fmt.Sprintf("/tmp/seaweefs-filer-%d.sock", *fo.port)
+		localSocket := *fo.localSocket
+		if localSocket == "" {
+			localSocket = fmt.Sprintf("/tmp/seaweefs-filer-%d.sock", *fo.port)
 		}
-		if err := os.Remove(*fo.localSocket); err != nil && !os.IsNotExist(err) {
-			glog.Fatalf("Failed to remove %s, error: %s", *fo.localSocket, err.Error())
+		if err := os.Remove(localSocket); err != nil && !os.IsNotExist(err) {
+			glog.Fatalf("Failed to remove %s, error: %s", localSocket, err.Error())
 		}
 		go func() {
 			// start on local unix socket
-			filerSocketListener, err := net.Listen("unix", *fo.localSocket)
+			filerSocketListener, err := net.Listen("unix", localSocket)
 			if err != nil {
-				glog.Fatalf("Failed to listen on %s: %v", *fo.localSocket, err)
+				glog.Fatalf("Failed to listen on %s: %v", localSocket, err)
 			}
 			httpS.Serve(filerSocketListener)
 		}()

weed/command/s3.go

@@ -194,7 +194,7 @@ func (s3opt *S3Options) startS3Server() bool {
 		GrpcDialOption:            grpcDialOption,
 		AllowEmptyFolder:          *s3opt.allowEmptyFolder,
 		AllowDeleteBucketNotEmpty: *s3opt.allowDeleteBucketNotEmpty,
-		LocalFilerSocket:          s3opt.localFilerSocket,
+		LocalFilerSocket:          *s3opt.localFilerSocket,
 		DataCenter:                *s3opt.dataCenter,
 	})
 	if s3ApiServer_err != nil {

weed/s3api/s3api_server.go

@@ -28,7 +28,7 @@ type S3ApiServerOption struct {
 	GrpcDialOption            grpc.DialOption
 	AllowEmptyFolder          bool
 	AllowDeleteBucketNotEmpty bool
-	LocalFilerSocket          *string
+	LocalFilerSocket          string
 	DataCenter                string
 }
 
@@ -59,7 +59,7 @@ func NewS3ApiServer(router *mux.Router, option *S3ApiServerOption) (s3ApiServer
 		filerGuard:     security.NewGuard([]string{}, signingKey, expiresAfterSec, readSigningKey, readExpiresAfterSec),
 		cb:             NewCircuitBreaker(option),
 	}
-	if option.LocalFilerSocket == nil || *option.LocalFilerSocket == "" {
+	if option.LocalFilerSocket == "" {
 		s3ApiServer.client = &http.Client{Transport: &http.Transport{
 			MaxIdleConns:        1024,
 			MaxIdleConnsPerHost: 1024,
@@ -68,7 +68,7 @@ func NewS3ApiServer(router *mux.Router, option *S3ApiServerOption) (s3ApiServer
 		s3ApiServer.client = &http.Client{
 			Transport: &http.Transport{
 				DialContext: func(_ context.Context, _, _ string) (net.Conn, error) {
-					return net.Dial("unix", *option.LocalFilerSocket)
+					return net.Dial("unix", option.LocalFilerSocket)
 				},
 			},
 		}