code: func (d *CatalogNodesQuery) Fetch(clients *ClientSet, opts *QueryOptions) (interface{}, *ResponseMetadata, error) {
  	select {
  	case <-d.stopCh:
  		return nil, nil, ErrStopped
  	default:
  	}
  
  	opts = opts.Merge(&QueryOptions{
  		Datacenter: d.dc,
  		Near:       d.near,
  	})
  
  	log.Printf("[TRACE] %s: GET %s", d, &url.URL{
  		Path:     "/v1/catalog/nodes",
  		RawQuery: opts.String(),
  	})
  	n, qm, err := clients.Consul().Catalog().Nodes(opts.ToConsulOpts())
  	if err != nil {
  		return nil, nil, errors.Wrap(err, d.String())
  	}
  
  	log.Printf("[TRACE] %s: returned %d results", d, len(n))
  
  	nodes := make([]*Node, 0, len(n))
  	for _, node := range n {
  		nodes = append(nodes, &Node{
  			ID:              node.ID,
  			Node:            node.Node,
  			Address:         node.Address,
  			Datacenter:      node.Datacenter,
  			TaggedAddresses: node.TaggedAddresses,
  			Meta:            node.Meta,
  		})
  	}
  
  	// Sort unless the user explicitly asked for nearness
  	if d.near == "" {
  		sort.Stable(ByNode(nodes))
  	}
  
  	rm := &ResponseMetadata{
  		LastIndex:   qm.LastIndex,
  		LastContact: qm.LastContact,
  	}
  
  	return nodes, rm, nil
  }
docs: // Fetch queries the Consul API defined by the given client and returns a slice
  // of Node objects