def _get_audit_task_logs(self, context, begin=None, end=None,
                             before=None):
        """Returns a full log for all instance usage audit tasks on all
           computes.

        :param begin: datetime beginning of audit period to get logs for,
            Defaults to the beginning of the most recently completed
            audit period prior to the 'before' date.
        :param end: datetime ending of audit period to get logs for,
            Defaults to the ending of the most recently completed
            audit period prior to the 'before' date.
        :param before: By default we look for the audit period most recently
            completed before this datetime. Has no effect if both begin and end
            are specified.
        """
        defbegin, defend = utils.last_completed_audit_period(before=before)
        if begin is None:
            begin = defbegin
        if end is None:
            end = defend
        task_logs = self.host_api.task_log_get_all(context,
                                                   "instance_usage_audit",
                                                   begin, end)
        # We do this in this way to include disabled compute services,
        # which can have instances on them. (mdragon)
        filters = {'topic': CONF.compute_topic}
        services = self.host_api.service_get_all(context, filters=filters)
        hosts = set(serv['host'] for serv in services)
        seen_hosts = set()
        done_hosts = set()
        running_hosts = set()
        total_errors = 0
        total_items = 0
        for tlog in task_logs:
            seen_hosts.add(tlog['host'])
            if tlog['state'] == "DONE":
                done_hosts.add(tlog['host'])
            if tlog['state'] == "RUNNING":
                running_hosts.add(tlog['host'])
            total_errors += tlog['errors']
            total_items += tlog['task_items']
        log = {tl['host']: dict(state=tl['state'],
                                instances=tl['task_items'],
                                errors=tl['errors'],
                                message=tl['message'])
               for tl in task_logs}
        missing_hosts = hosts - seen_hosts
        overall_status = "%s hosts done. %s errors." % (
                    'ALL' if len(done_hosts) == len(hosts)
                    else "%s of %s" % (len(done_hosts), len(hosts)),
                    total_errors)
        return dict(period_beginning=str(begin),
                    period_ending=str(end),
                    num_hosts=len(hosts),
                    num_hosts_done=len(done_hosts),
                    num_hosts_running=len(running_hosts),
                    num_hosts_not_run=len(missing_hosts),
                    hosts_not_run=list(missing_hosts),
                    total_instances=total_items,
                    total_errors=total_errors,
                    overall_status=overall_status,
                    log=log)
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/api/openstack/compute/instance_usage_audit_log.py/InstanceUsageAuditLogController._get_audit_task_logs/original