def _command(self, node, method, params, wait=False):
        url = self._get_command_url(node)
        body = self._get_command_body(method, params)
        request_params = {
            'wait': str(wait).lower()
        }
        LOG.debug('Executing agent command %(method)s for node %(node)s',
                  {'node': node.uuid, 'method': method})

        try:
            response = self.session.post(url, params=request_params, data=body)
        except requests.RequestException as e:
            msg = (_('Error invoking agent command %(method)s for node '
                     '%(node)s. Error: %(error)s') %
                   {'method': method, 'node': node.uuid, 'error': e})
            LOG.error(msg)
            raise exception.IronicException(msg)

        # TODO(russellhaering): real error handling
        try:
            result = response.json()
        except __HOLE__:
            msg = _(
                'Unable to decode response as JSON.\n'
                'Request URL: %(url)s\nRequest body: "%(body)s"\n'
                'Response status code: %(code)s\n'
                'Response: "%(response)s"'
            ) % ({'response': response.text, 'body': body, 'url': url,
                  'code': response.status_code})
            LOG.error(msg)
            raise exception.IronicException(msg)

        LOG.debug('Agent command %(method)s for node %(node)s returned '
                  'result %(res)s, error %(error)s, HTTP status code %(code)d',
                  {'node': node.uuid, 'method': method,
                   'res': result.get('command_result'),
                   'error': result.get('command_error'),
                   'code': response.status_code})
        return result
dataset/ETHPy150Open openstack/ironic/ironic/drivers/modules/agent_client.py/AgentClient._command