Get log or log url of the jobs.

def get_logs(self, jobs, log_file=None):
        """Get log or log url of the jobs."""
        if not (jobs and self.log_url):
            return

        for job in jobs:
            url = "{}?jobId={}".format(self.log_url, job.get("id"))
            if log_file:
                self._download_log("{}&download".format(url), log_file)
            else:
                logger.info("Submit log for job %s: %s", job.get("id"), url)