func (cli *OpsGenieHeartbeatClient) List(req heartbeat.ListHeartbeatsRequest) (*heartbeat.ListHeartbeatsResponse, error) { req.ApiKey = cli.apiKey // validate the mandatory field: apiKey if req.ApiKey == "" { return nil, errors.New("Api Key is a mandatory field and can not be empty") } // send the request in a query string v, _ := goquery.Values(req) var resp *goreq.Response var err error for i := 0; i < cli.retries; i++ { resp, err = cli.buildRequest("GET", LIST_HEARTBEAT_URL+"?"+v.Encode(), nil).Do() if err == nil { break } time.Sleep(TIME_SLEEP_BETWEEN_REQUESTS) } if err != nil { return nil, errors.New("Can not retrieve the list of heart beats, unable to send the request") } // check for the returning http status, 4xx: client errors, 5xx: server errors statusCode := resp.StatusCode if statusCode >= 400 && statusCode < 500 { return nil, errors.New(fmt.Sprintf("Client error %d occured", statusCode)) } if statusCode >= 500 { return nil, errors.New(fmt.Sprintf("Server error %d occured", statusCode)) } // try to parse the returning JSON into the response var listHeartbeatsResp heartbeat.ListHeartbeatsResponse if err = resp.Body.FromJsonTo(&listHeartbeatsResp); err != nil { return nil, errors.New("Server response can not be parsed") } // parsed successfuly with no errors return &listHeartbeatsResp, nil }