// List method retrieves alerts from OpsGenie.
func (cli *OpsGenieAlertClient) List(req alerts.ListAlertsRequest) (*alerts.ListAlertsResponse, error) {
	req.APIKey = cli.apiKey
	resp, err := cli.sendRequest(cli.buildGetRequest(listAlertsURL, req))

	if resp == nil {
		return nil, errors.New(err.Error())
	}
	defer resp.Body.Close()

	var listAlertsResp alerts.ListAlertsResponse

	if err = resp.Body.FromJsonTo(&listAlertsResp); err != nil {
		message := "Server response can not be parsed, " + err.Error()
		logging.Logger().Warn(message)
		return nil, errors.New(message)
	}
	return &listAlertsResp, nil
}