mount: outsideContainerClusterMode proxy through filer

Running mount outside of the cluster would not need to expose all the volume servers to outside of the cluster. The chunk read and write will go through the filer.

weed/filesys/wfs.go

@@ -3,6 +3,8 @@ package filesys
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/wdclient"
 	"math"
 	"os"
 	"path"
@@ -24,6 +26,7 @@ import (
 )
 
 type Option struct {
+	FilerAddress       string
 	FilerGrpcAddress   string
 	GrpcDialOption     grpc.DialOption
 	FilerMountRootPath string
@@ -237,3 +240,13 @@ func (wfs *WFS) mapPbIdFromLocalToFiler(entry *filer_pb.Entry) {
 	}
 	entry.Attributes.Uid, entry.Attributes.Gid = wfs.option.UidGidMapper.LocalToFiler(entry.Attributes.Uid, entry.Attributes.Gid)
 }
+
+func (wfs *WFS) LookupFn() wdclient.LookupFileIdFunctionType {
+	if wfs.option.OutsideContainerClusterMode {
+		return func(fileId string) (targetUrls []string, err error) {
+			return []string{"http://" + wfs.option.FilerAddress + "/?proxyChunkId=" + fileId}, nil
+		}
+	}
+	return filer.LookupFn(wfs)
+
+}