activate(params) {
      let fabric_response = yield this.http.get(`${ this.url_base }/fabrics`)
      return fabric_response.content.map( fabric => {
          let cluster_response = yield this.http.get(`${ this.url_base }/fabrics/${ fabric.name }/clusters`)
          if(fabric.clusters_exist) {
              this.fabrics.push({"name": fabric.name, "clusters": cluster_response.content});
          }
      });
    }