added failsafe

node.go

@@ -8,7 +8,11 @@ import (
 	"fmt"
 )
 
-var ErrServerNotFound = errors.New("server not found")
+var (
+	ErrServerNotFound   = errors.New("server not found")
+	ErrNodesOffline     = errors.New("one or more nodes are offline")
+	ErrNodesNotSearched = errors.New("one or more nodes could not be searched")
+)
 
 type NodeStatus string
 
@@ -59,12 +63,16 @@ func (c *NodeClient) FindServer(ctx context.Context, name, id string) (s *Server
 	if err != nil {
 		return
 	}
+	nodeOffline := false
+	nodeNotSearched := false
 	for _, node := range nl {
 		if node.Status != NodeStatusOnline {
+			nodeOffline = true
 			continue
 		}
 		sl, err := c.ListServers(ctx, node)
 		if err != nil {
+			nodeNotSearched = true
 			continue
 		}
 		for _, s := range sl {
@@ -76,6 +84,12 @@ func (c *NodeClient) FindServer(ctx context.Context, name, id string) (s *Server
 			}
 		}
 	}
+	if nodeOffline {
+		return nil, ErrNodesOffline
+	}
+	if nodeNotSearched {
+		return nil, ErrNodesNotSearched
+	}
 	return nil, ErrServerNotFound
 }