dynamically connect to a filer

weed/cluster/master_client.go

@@ -0,0 +1,34 @@
+package cluster
+
+import (
+	"context"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"google.golang.org/grpc"
+)
+
+func ListExistingPeerUpdates(master pb.ServerAddress, grpcDialOption grpc.DialOption, filerGroup string, clientType string) (existingNodes []*master_pb.ClusterNodeUpdate) {
+
+	if grpcErr := pb.WithMasterClient(false, master, grpcDialOption, func(client master_pb.SeaweedClient) error {
+		resp, err := client.ListClusterNodes(context.Background(), &master_pb.ListClusterNodesRequest{
+			ClientType: clientType,
+			FilerGroup: filerGroup,
+		})
+
+		glog.V(0).Infof("the cluster has %d %s\n", len(resp.ClusterNodes), clientType)
+		for _, node := range resp.ClusterNodes {
+			existingNodes = append(existingNodes, &master_pb.ClusterNodeUpdate{
+				NodeType:    FilerType,
+				Address:     node.Address,
+				IsLeader:    node.IsLeader,
+				IsAdd:       true,
+				CreatedAtNs: node.CreatedAtNs,
+			})
+		}
+		return err
+	}); grpcErr != nil {
+		glog.V(0).Infof("connect to %s: %v", master, grpcErr)
+	}
+	return
+}