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From to...@apache.org
Subject [06/10] libcloud git commit: [LIBCLOUD-802] Refactor codes according to the project convention
Date Sat, 12 Mar 2016 21:52:40 GMT
http://git-wip-us.apache.org/repos/asf/libcloud/blob/ae4c482b/libcloud/compute/drivers/ecs.py
----------------------------------------------------------------------
diff --git a/libcloud/compute/drivers/ecs.py b/libcloud/compute/drivers/ecs.py
index 2e5e59e..7929720 100644
--- a/libcloud/compute/drivers/ecs.py
+++ b/libcloud/compute/drivers/ecs.py
@@ -33,8 +33,12 @@ from libcloud.utils.py3 import _real_unicode as u
 from libcloud.utils.xml import findall, findattr, findtext
 
 __all__ = [
+    'DiskCategory',
+    'InternetChargeType',
     'ECS_API_VERSION',
-    'ECSDriver'
+    'ECSDriver',
+    'ECSSecurityGroup',
+    'ECSZone'
 ]
 
 ECS_API_VERSION = '2014-05-26'
@@ -42,1057 +46,12 @@ ECS_API_ENDPOINT = 'ecs.aliyuncs.com'
 DEFAULT_SIGNATURE_VERSION = '1.0'
 
 
-class ECSConnection(SignedAliyunConnection):
-    """
-    Represents a single connection to the Aliyun ECS Endpoint.
-    """
-
-    version = ECS_API_VERSION
-    host = ECS_API_ENDPOINT
-    responseCls = AliyunXmlResponse
-    service_name = 'ecs'
-
-
-class ECSSecurityGroup(object):
-    """
-    Security group used to control nodes internet and intranet accessibility.
-    """
-    def __init__(self, id, name, description=None, driver=None, vpc_id=None,
-                 creation_time=None):
-        self.id = id
-        self.name = name
-        self.description = description
-        self.driver = driver
-        self.vpc_id = vpc_id
-        self.creation_time = creation_time
-
-    def __repr__(self):
-        return ('<ECSSecurityGroup: id=%s, name=%s, driver=%s ...>' %
-                (self.id, self.name, self.driver.name))
-
-
-class ECSZone(object):
-    """
-    ECSZone used to represent an availability zone in a region.
-    """
-    def __init__(self, id, name, driver=None,
-                 available_resource_types=None,
-                 available_instance_types=None,
-                 available_disk_categories=None):
-        self.id = id
-        self.name = name
-        self.driver = driver
-        self.available_resource_types = available_resource_types
-        self.available_instance_types = available_instance_types
-        self.available_disk_categories = available_disk_categories
-
-    def __repr__(self):
-        return ('<ECSZone: id=%s, name=%s, driver=%s>' %
-                (self.id, self.name, self.driver))
-
-
-class InternetChargeType(object):
-    """
-    Internet connection billing types for Aliyun Nodes.
-    """
-    BY_BANDWIDTH = 'PayByBandwidth'
-    BY_TRAFFIC = 'PayByTraffic'
-
-
-class DiskCategory(object):
-    """
-    Enum defined disk types supported by Aliyun system and data disks.
-    """
-    CLOUD = 'cloud'
-    CLOUD_EFFICIENCY = 'cloud_efficiency'
-    CLOUD_SSD = 'cloud_ssd'
-    EPHEMERAL_SSD = 'ephemeral_ssd'
-
-
-class Pagination(object):
-    """
-    Pagination used to describe the multiple pages results.
-    """
-    def __init__(self, total, size, current):
-        """
-        Create a pagination.
-
-        :param total: the total count of the results
-        :param size: the page size of each page
-        :param current: the current page number, 1-based
-        """
-        self.total = total
-        self.size = size
-        self.current = current
-
-    def next(self):
-        """
-        Switch to the next page.
-        :return: the new pagination or None when no more page
-        :rtype: ``Pagination``
-        """
-        if self.total is None or (self.size * self.current >= self.total):
-            return None
-        self.current += 1
-        return self
-
-    def to_dict(self):
-        return {'PageNumber': self.current,
-                'PageSize': self.size}
-
-    def __repr__(self):
-        return ('<Pagination total=%d, size=%d, current page=%d>' %
-                (self.total, self.size, self.current))
-
-
-class ECSDriver(NodeDriver):
-    """
-    Aliyun ECS node driver.
-
-    Used for Aliyun ECS service.
-    """
-
-    name = 'Aliyun ECS'
-    website = 'https://www.aliyun.com/product/ecs'
-    connectionCls = ECSConnection
-    features = {'create_node': ['password']}
-    namespace = None
-    path = '/'
-
-    internet_charge_types = InternetChargeType
-    disk_categories = DiskCategory
-
-    NODE_STATE_MAPPING = {
-        'Starting': NodeState.PENDING,
-        'Running': NodeState.RUNNING,
-        'Stopping': NodeState.PENDING,
-        'Stopped': NodeState.STOPPED
-    }
-
-    VOLUME_STATE_MAPPING = {
-        'In_use': StorageVolumeState.INUSE,
-        'Available': StorageVolumeState.AVAILABLE,
-        'Attaching': StorageVolumeState.ATTACHING,
-        'Detaching': StorageVolumeState.INUSE,
-        'Creating': StorageVolumeState.CREATING,
-        'ReIniting': StorageVolumeState.CREATING}
-
-    SNAPSHOT_STATE_MAPPING = {
-        'progressing': VolumeSnapshotState.CREATING,
-        'accomplished': VolumeSnapshotState.AVAILABLE,
-        'failed': VolumeSnapshotState.ERROR}
-
-    def list_nodes(self, ex_node_ids=[], ex_filters=None):
-        """
-        List all nodes.
-
-        @inherits: :class:`NodeDriver.create_node`
-
-        :keyword  ex_node_ids: a list of node's ids used to filter nodes.
-                               Only the nodes which's id in this list
-                               will be returned.
-        :type   ex_node_ids: ``list`` of ``str``
-        :keyword  ex_filters: node attribute and value pairs to filter nodes.
-                              Only the nodes which matchs all the pairs will
-                              be returned.
-                              If the filter attribute need a json array value,
-                              use ``list`` object, the driver will convert it.
-        :type   ex_filters: ``dict``
-        """
-
-        params = {'Action': 'DescribeInstances',
-                  'RegionId': self.region}
-
-        if ex_node_ids:
-            if isinstance(ex_node_ids, list):
-                params['InstanceIds'] = json.dumps(ex_node_ids)
-            else:
-                raise AttributeError('ex_node_ids should be a list of '
-                                     'node ids.')
-
-        if ex_filters:
-            if isinstance(ex_filters, dict):
-                params.update(ex_filters)
-            else:
-                raise AttributeError('ex_filters should be a dict of '
-                                     'node attributes.')
-
-        nodes = self._request_multiple_pages(self.path, params,
-                                             self._to_nodes)
-        return nodes
-
-    def list_sizes(self, location=None):
-        params = {'Action': 'DescribeInstanceTypes'}
-
-        resp_body = self.connection.request(self.path, params).object
-        size_elements = findall(resp_body, 'InstanceTypes/InstanceType',
-                                namespace=self.namespace)
-        sizes = [self._to_size(each) for each in size_elements]
-        return sizes
-
-    def list_locations(self):
-        params = {'Action': 'DescribeRegions'}
-
-        resp_body = self.connection.request(self.path, params).object
-        location_elements = findall(resp_body, 'Regions/Region',
-                                    namespace=self.namespace)
-        locations = [self._to_location(each) for each in location_elements]
-        return locations
-
-    def create_node(self, **kwargs):
-        name = kwargs['name']
-        size = kwargs['size']
-        image = kwargs['image']
-
-        params = {'Action': 'CreateInstance',
-                  'RegionId': self.region,
-                  'ImageId': image.id,
-                  'InstanceType': size.id,
-                  'InstanceName': name}
-
-        if 'ex_security_group_id' not in kwargs:
-            raise AttributeError('ex_security_group_id is mandatory')
-        params['SecurityGroupId'] = kwargs['ex_security_group_id']
-
-        if 'ex_description' in kwargs:
-            params['Description'] = kwargs['ex_description']
-
-        if 'ex_internet_charge_type' in kwargs:
-            params['InternetChargeType'] = kwargs['ex_internet_charge_type']
-            if kwargs['ex_internet_charge_type'].lower() == 'paybytraffic':
-                if 'ex_internet_max_bandwidth_out' not in kwargs:
-                    raise AttributeError('ex_internet_max_bandwidth_out is '
-                                         'mandatory for PayByTraffic internet'
-                                         ' charge type.')
-                else:
-                    params['InternetMaxBandwidthOut'] = \
-                        kwargs['ex_internet_max_bandwidth_out']
-
-        if 'ex_internet_max_bandwidth_in' in kwargs:
-            params['InternetMaxBandwidthIn'] = \
-                kwargs['ex_internet_max_bandwidth_in']
-
-        if 'ex_hostname' in kwargs:
-            params['HostName'] = kwargs['ex_hostname']
-
-        if 'auth' in kwargs:
-            auth = self._get_and_check_auth(kwargs['auth'])
-            params['Password'] = auth.password
-
-        if 'ex_io_optimized' in kwargs:
-            optimized = kwargs['ex_io_optimized']
-            if not isinstance(optimized, bool):
-                optimized = str(optimized).lower() == 'true'
-            params['IoOptimized'] = 'true' if optimized else 'false'
-
-        if 'ex_system_disk' in kwargs:
-            if not isinstance(kwargs['ex_system_disk'], dict):
-                raise AttributeError('ex_system_disk is not a dict')
-            sys_disk_dict = kwargs['ex_system_disk']
-            key_base = 'SystemDisk.'
-            mappings = {'category': 'Category',
-                        'disk_name': 'DiskName',
-                        'description': 'Description'}
-            for attr in mappings.keys():
-                if attr in sys_disk_dict:
-                    params[key_base + mappings[attr]] = sys_disk_dict[attr]
-
-        if 'ex_data_disk' in kwargs:
-            if isinstance(kwargs['ex_data_disk'], dict):
-                data_disks = [kwargs['ex_data_disk']]
-            elif isinstance(kwargs['ex_data_disk'], list):
-                data_disks = kwargs['ex_data_disk']
-            disk_key_base = 'DataDisk.'
-            mappings = {'size': 'Size',
-                        'category': 'Category',
-                        'snapshot_id': 'SnapshotId',
-                        'disk_name': 'DiskName',
-                        'description': 'Description',
-                        'device': 'Device',
-                        'delete_with_instance': 'DeleteWithInstance'}
-            for idx, disk in enumerate(data_disks):
-                key_base = disk_key_base + str(idx + 1) + '.'
-                for attr in mappings.keys():
-                    if attr in disk:
-                        if attr == 'delete_with_instance':
-                            # Convert bool value to str
-                            value = str(disk[attr]).lower()
-                        else:
-                            value = disk[attr]
-                        params[key_base + mappings[attr]] = value
-
-        if 'ex_vswitch_id' in kwargs:
-            params['VSwitchId'] = kwargs['ex_vswitch_id']
-
-        if 'ex_private_ip_address' in kwargs:
-            if 'ex_vswitch_id' not in kwargs:
-                raise AttributeError('must provide ex_private_ip_address  '
-                                     'and ex_vswitch_id at the same time')
-            else:
-                params['PrivateIpAddress'] = kwargs['ex_private_ip_address']
-
-        if 'ex_client_token' in kwargs:
-            params['ClientToken'] = kwargs['ex_client_token']
-
-        resp = self.connection.request(self.path, params=params)
-        node_id = findtext(resp.object, xpath='InstanceId',
-                           namespace=self.namespace)
-        nodes = self.list_nodes(ex_node_ids=[node_id])
-        if len(nodes) != 1:
-            raise LibcloudError('could not find the new created node '
-                                'with id %s. ' % node_id,
-                                driver=self)
-        node = nodes[0]
-        self.ex_start_node(node)
-        self._wait_until_state(nodes, NodeState.RUNNING)
-        return node
-
-    def reboot_node(self, node, ex_force_stop=False):
-        """
-        @inherits :class:`NodeDriver.reboot_node`
-        :keyword ex_force_stop: if ``True``, stop node force (maybe lose data)
-                                otherwise, stop node normally,
-                                default to ``False``
-        :type ex_force_stop: ``bool``
-        """
-        params = {'Action': 'RebootInstance',
-                  'InstanceId': node.id,
-                  'ForceStop': u(ex_force_stop).lower()}
-        resp = self.connection.request(self.path, params=params)
-        return resp.success() and \
-            self._wait_until_state([node], NodeState.RUNNING)
-
-    def destroy_node(self, node):
-        nodes = self.list_nodes(ex_node_ids=[node.id])
-        if len(nodes) != 1 and node.id != nodes[0].id:
-            raise LibcloudError('could not find the node with id %s.'
-                                % node.id)
-        current = nodes[0]
-        if current.state == NodeState.RUNNING:
-            # stop node first
-            self.ex_stop_node(node)
-            self._wait_until_state(nodes, NodeState.STOPPED)
-        params = {'Action': 'DeleteInstance',
-                  'InstanceId': node.id}
-        resp = self.connection.request(self.path, params)
-        return resp.success()
-
-    def ex_start_node(self, node):
-        """
-        Start node to running state.
-
-        :param node: ``Node`` object
-        :return: starting operation result.
-        :rtype: ``bool``
-        """
-        params = {'Action': 'StartInstance',
-                  'InstanceId': node.id}
-        resp = self.connection.request(self.path, params)
-        return resp.success() and \
-            self._wait_until_state([node], NodeState.RUNNING)
-
-    def ex_stop_node(self, node, ex_force_stop=False):
-        """
-        Stop a running node.
-
-        :param node: The node to stop
-        :type node: :class:`Node`
-        :keyword ex_force_stop: if ``True``, stop node force (maybe lose data)
-                                otherwise, stop node normally,
-                                default to ``False``
-        :type ex_force_stop: ``bool``
-        :return: stopping operation result.
-        :rtype: ``bool``
-        """
-        params = {'Action': 'StopInstance',
-                  'InstanceId': node.id,
-                  'ForceStop': u(ex_force_stop).lower()}
-        resp = self.connection.request(self.path, params)
-        return resp.success() and \
-            self._wait_until_state([node], NodeState.STOPPED)
-
-    def ex_list_security_groups(self, ex_filters=None):
-        """
-        List security groups in the current region.
-
-        :keyword ex_filters: security group attributes to filter results.
-        :type ex_filters: ``dict``
-        :return: a list of defined security groups
-        :rtype: ``list`` of ``ECSSecurityGroup``
-        """
-        params = {'Action': 'DescribeSecurityGroups',
-                  'RegionId': self.region}
-
-        if ex_filters and isinstance(ex_filters, dict):
-            ex_filters.update(params)
-            params = ex_filters
-
-        def _parse_response(resp_object):
-            sg_elements = findall(resp_object, 'SecurityGroups/SecurityGroup',
-                                  namespace=self.namespace)
-            sgs = [self._to_security_group(el) for el in sg_elements]
-            return sgs
-        return self._request_multiple_pages(self.path, params,
-                                            _parse_response)
-
-    def ex_list_zones(self, region_id=None):
-        """
-        List availability zones in the given region or the current region.
-        :keyword region_id: the id of the region to query zones from
-        :type region_id: ``str``
-        :return: list of zones
-        :rtype: ``list`` of ``ECSZone``
-        """
-        params = {'Action': 'DescribeZones'}
-        if region_id:
-            params['RegionId'] = region_id
-        else:
-            params['RegionId'] = self.region
-        resp_body = self.connection.request(self.path, params).object
-        zone_elements = findall(resp_body, 'Zones/Zone',
-                                namespace=self.namespace)
-        zones = [self._to_zone(el) for el in zone_elements]
-        return zones
-
-    ##
-    # Volume and snapshot management methods
-    ##
-
-    def list_volumes(self, ex_volume_ids=[], ex_filters=None):
-        """
-        List all volumes.
-
-        @inherits: :class:`NodeDriver.list_volumes`
-
-        :keyword  ex_volume_ids: a list of volume's ids used to filter volumes.
-                                 Only the volumes which's id in this list
-                                 will be returned.
-        :type   ex_volume_ids: ``list`` of ``str``
-        :keyword  ex_filters: volume attribute and value pairs to filter
-                              volumes. Only the volumes which matchs all will
-                              be returned.
-                              If the filter attribute need a json array value,
-                              use ``list`` object, the driver will convert it.
-        :type   ex_filters: ``dict``
-        """
-        params = {'Action': 'DescribeDisks',
-                  'RegionId': self.region}
-
-        if ex_volume_ids:
-            if isinstance(ex_volume_ids, list):
-                params['DiskIds'] = json.dumps(ex_volume_ids)
-            else:
-                raise AttributeError('ex_volume_ids should be a list of '
-                                     'volume ids.')
-
-        if ex_filters:
-            if not isinstance(ex_filters, dict):
-                raise AttributeError('ex_filters should be a dict of '
-                                     'volume attributes.')
-            else:
-                for key in ex_filters.keys():
-                    params[key] = ex_filters[key]
-
-        def _parse_response(resp_object):
-            disk_elements = findall(resp_object, 'Disks/Disk',
-                                    namespace=self.namespace)
-            volumes = [self._to_volume(each) for each in disk_elements]
-            return volumes
-        return self._request_multiple_pages(self.path, params,
-                                            _parse_response)
-
-    def list_volume_snapshots(self, volume, ex_snapshot_ids=[],
-                              ex_filters=None):
-        """
-        List snapshots for a storage volume.
-
-        @inherites :class:`NodeDriver.list_volume_snapshots`
-        :keyword ex_snapshot_ids: a list of snapshot ids to filter the
-                                  snapshots returned.
-        :type ex_snapshot_ids: ``list`` of ``str``
-        :keyword ex_filters: snapshot attribute and value pairs to filter
-                             snapshots. Only the snapshot which matchs all
-                             the pairs will be returned.
-                             If the filter attribute need a json array value,
-                             use ``list`` object, the driver will convert it.
-        :type   ex_filters: ``dict``
-        """
-        params = {'Action': 'DescribeSnapshots',
-                  'RegionId': self.region}
-
-        if volume:
-            params['DiskId'] = volume.id
-        if ex_snapshot_ids and isinstance(ex_snapshot_ids, list):
-            params['SnapshotIds'] = self._list_to_json_array(ex_snapshot_ids)
-        if ex_filters and isinstance(ex_filters, dict):
-            for key in ex_filters.keys():
-                params[key] = ex_filters[key]
-
-        def _parse_response(resp_body):
-            snapshot_elements = findall(resp_body, 'Snapshots/Snapshot',
-                                        namespace=self.namespace)
-            snapshots = [self._to_snapshot(each) for each in snapshot_elements]
-            return snapshots
-
-        return self._request_multiple_pages(self.path, params,
-                                            _parse_response)
-
-    def create_volume(self, size, name, location=None, snapshot=None,
-                      ex_zone_id=None, ex_description=None,
-                      ex_disk_category=None, ex_client_token=None):
-        """
-        Create a new volume.
-
-        @inherites :class:`NodeDriver.create_volume`
-        :keyword ex_zone_id: the availability zone id (required)
-        :type ex_zone_id: ``str``
-        :keyword ex_description: volume description
-        :type ex_description: ``unicode``
-        :keyword ex_disk_category: disk category for data disk
-        :type ex_disk_category: ``str``
-        :keyword ex_client_token: a token generated by client to identify
-                                each request.
-        :type ex_client_token: ``str``
-        """
-        params = {'Action': 'CreateDisk',
-                  'RegionId': self.region,
-                  'DiskName': name,
-                  'Size': size}
-        if ex_zone_id is None:
-            raise AttributeError('ex_zone_id is required')
-        params['ZoneId'] = ex_zone_id
-
-        if snapshot is not None and isinstance(snapshot, VolumeSnapshot):
-            params['SnapshotId'] = snapshot.id
-        if ex_description:
-            params['Description'] = ex_description
-        if ex_disk_category:
-            params['DiskCategory'] = ex_disk_category
-        if ex_client_token:
-            params['ClientToken'] = ex_client_token
-        resp = self.connection.request(self.path, params).object
-        volume_id = findtext(resp, 'DiskId', namespace=self.namespace)
-        volumes = self.list_volumes(ex_volume_ids=[volume_id])
-        if len(volumes) != 1:
-            raise LibcloudError('could not find the new create volume '
-                                'with id %s.' % volume_id,
-                                driver=self)
-        return volumes[0]
-
-    def create_volume_snapshot(self, volume, name=None, ex_description=None,
-                               ex_client_token=None):
-        """
-        Creates a snapshot of the storage volume.
-        @inherits :class:`NodeDriver.create_volume_snapshot`
-        :keyword ex_description: description of the snapshot.
-        :type ex_description: ``unicode``
-        :keyword ex_client_token: a token generated by client to identify
-                                each request.
-        :type ex_client_token: ``str``
-        """
-        params = {'Action': 'CreateSnapshot',
-                  'DiskId': volume.id}
-        if name:
-            params['SnapshotName'] = name
-        if ex_description:
-            params['Description'] = ex_description
-        if ex_client_token:
-            params['ClientToken'] = ex_client_token
-
-        snapshot_elements = self.connection.request(self.path, params).object
-        snapshot_id = findtext(snapshot_elements, 'SnapshotId',
-                               namespace=self.namespace)
-        snapshots = self.list_volume_snapshots(volume=None,
-                                               ex_snapshot_ids=[snapshot_id])
-        if len(snapshots) != 1:
-            raise LibcloudError('could not find new created snapshot with '
-                                'id %s.' % snapshot_id, driver=self)
-        return snapshots[0]
-
-    def attach_volume(self, node, volume, device=None,
-                      ex_delete_with_instance=None):
-        """
-        Attaches volume to node.
-
-        @inherits :class:`NodeDriver.attach_volume`
-
-        :keyword ex_delete_with_instance: if to delete this volume when the
-                                        instance is deleted.
-        :type ex_delete_with_instance: ``bool``
-        """
-        params = {'Action': 'AttachDisk',
-                  'InstanceId': node.id,
-                  'DiskId': volume.id}
-
-        if device:
-            params['Device'] = device
-        if ex_delete_with_instance:
-            params['DeleteWithInstance'] = \
-                str(bool(ex_delete_with_instance)).lower()
-        resp = self.connection.request(self.path, params)
-        return resp.success()
-
-    def detach_volume(self, volume, ex_instance_id=None):
-        """
-        Detaches a volume from a node.
-
-        @inherits :class:`NodeDriver.detach_volume`
-
-        :keyword ex_instance_id: the id of the instance from which the volume
-                                 is detached.
-        :type ex_instance_id: ``str``
-        """
-        params = {'Action': 'DetachDisk',
-                  'DiskId': volume.id}
-
-        if ex_instance_id:
-            params['InstanceId'] = ex_instance_id
-        else:
-            volumes = self.list_volumes(ex_volume_ids=[volume.id])
-            if len(volumes) != 1:
-                raise AttributeError('could not find the instance id '
-                                     'the volume %s attached to, '
-                                     'ex_instance_id is required.' %
-                                     volume.id)
-            params['InstanceId'] = volumes[0].extra['instance_id']
-
-        resp = self.connection.request(self.path, params)
-        return resp.success()
-
-    def destroy_volume(self, volume):
-        params = {'Action': 'DeleteDisk',
-                  'DiskId': volume.id}
-        volumes = self.list_volumes(ex_volume_ids=[volume.id])
-        if len(volumes) != 1:
-            raise LibcloudError('could not find the volume with id %s.' %
-                                volume.id,
-                                driver=self)
-        if volumes[0].state != StorageVolumeState.AVAILABLE:
-            raise LibcloudError('only volume in AVAILABLE state could be '
-                                'destroyed.', driver=self)
-        resp = self.connection.request(self.path, params)
-        return resp.success()
-
-    def destroy_volume_snapshot(self, snapshot):
-        params = {'Action': 'DeleteSnapshot'}
-
-        if snapshot and isinstance(snapshot, VolumeSnapshot):
-            params['SnapshotId'] = snapshot.id
-        else:
-            raise AttributeError('snapshot is required and must be a '
-                                 'VolumeSnapshot')
-        resp = self.connection.request(self.path, params)
-        return resp.success()
-
-    ##
-    # Image management methods
-    ##
-
-    def list_images(self, location=None, ex_image_ids=[], ex_filters=None):
-        """
-        List images on a provider.
-        @inherits :class:`NodeDriver.list_images`
-        :keyword ex_image_ids: a list of image ids to filter the images to
-                               be returned.
-        :type ex_image_ids: ``list`` of ``str``
-        :keyword ex_filters: image attribute and value pairs to filter
-                             images. Only the image which matchs all
-                             the pairs will be returned.
-                             If the filter attribute need a json array value,
-                             use ``list`` object, the driver will convert it.
-        :type   ex_filters: ``dict``
-        """
-
-        if location and isinstance(location, NodeLocation):
-            region = location.id
-        else:
-            region = self.region
-        params = {'Action': 'DescribeImages',
-                  'RegionId': region}
-        if ex_image_ids:
-            if isinstance(ex_image_ids, list):
-                params['ImageId'] = ','.join(ex_image_ids)
-            else:
-                raise AttributeError('ex_image_ids should be a list of '
-                                     'image ids')
-        if ex_filters and isinstance(ex_filters, dict):
-            for key in ex_filters.keys():
-                params[key] = ex_filters[key]
-
-        def _parse_response(resp_body):
-            image_elements = findall(resp_body, 'Images/Image',
-                                     namespace=self.namespace)
-            images = [self._to_image(each) for each in image_elements]
-            return images
-        return self._request_multiple_pages(self.path, params,
-                                            _parse_response)
-
-    def create_image(self, node, name, description=None, ex_snapshot_id=None,
-                     ex_image_version=None, ex_client_token=None):
-        """
-        Creates an image from a system disk snapshot.
-        @inherits :class:`NodeDriver.create_image`
-        :keyword ex_snapshot_id: the id of the snapshot to create the image.
-                                 (required)
-        :type ex_snapshot_id: ``str``
-        :keyword ex_image_version: the version number of the image
-        :type ex_image_version: ``str``
-        :keyword ex_client_token: a token generated by client to identify
-                                each request.
-        :type ex_client_token: ``str``
-        """
-        params = {'Action': 'CreateImage',
-                  'RegionId': self.region}
-        if name:
-            params['ImageName'] = name
-        if description:
-            params['Description'] = description
-        if ex_snapshot_id:
-            params['SnapshotId'] = ex_snapshot_id
-        else:
-            raise AttributeError('ex_snapshot_id is required')
-        if ex_image_version:
-            params['ImageVersion'] = ex_image_version
-        if ex_client_token:
-            params['ClientToken'] = ex_client_token
-
-        resp = self.connection.request(self.path, params)
-        image_id = findtext(resp.object, 'ImageId', namespace=self.namespace)
-        return self.get_image(image_id=image_id)
-
-    def delete_image(self, node_image):
-        params = {'Action': 'DeleteImage',
-                  'RegionId': self.region,
-                  'ImageId': node_image.id}
-        resp = self.connection.request(self.path, params)
-        return resp.success()
-
-    def get_image(self, image_id, ex_region_id=None):
-        if ex_region_id:
-            region = ex_region_id
-        else:
-            region = self.region
-        location = NodeLocation(id=region, name=None, country=None,
-                                driver=self)
-        images = self.list_images(location, ex_image_ids=[image_id])
-        if len(images) != 1:
-            raise LibcloudError('could not find the image with id %s' %
-                                image_id,
-                                driver=self)
-        return images[0]
-
-    def copy_image(self, source_region, node_image, name, description=None,
-                   ex_destination_region_id=None, ex_client_token=None):
-        """
-        Copies an image from a source region to the destination region.
-        If not provide a destination region, default to the current region.
-        @inherits :class:`NodeDriver.copy_image`
-        :keyword ex_destination_region_id: id of the destination region
-        :type ex_destination_region_id: ``str``
-        :keyword ex_client_token: a token generated by client to identify
-                                each request.
-        :type ex_client_token: ``str``
-        """
-        params = {'Action': 'CopyImage',
-                  'RegionId': source_region,
-                  'ImageId': node_image.id}
-        if ex_destination_region_id is not None:
-            params['DestinationRegionId'] = ex_destination_region_id
-        else:
-            params['DestinationRegionId'] = self.region
-        if name:
-            params['DestinationImageName'] = name
-        if description:
-            params['DestinationDescription'] = description
-        if ex_client_token:
-            params['ClientToken'] = ex_client_token
-        resp = self.connection.request(self.path, params)
-        image_id = findtext(resp.object, 'ImageId', namespace=self.namespace)
-        return self.get_image(image_id=image_id)
-
-    def _to_nodes(self, object):
-        """
-        Convert response to Node object list
-
-        :param object: parsed response object
-        :return: a list of ``Node``
-        :rtype: ``list``
-        """
-        node_elements = findall(object, 'Instances/Instance', self.namespace)
-        return [self._to_node(el) for el in node_elements]
-
-    def _to_node(self, instance):
-        """
-        Convert an InstanceAttributesType object to ``Node`` object
-
-        :param instance: a xml element represents an instance
-        :return: a ``Node`` object
-        :rtype: ``Node``
-        """
-        _id = findtext(element=instance, xpath='InstanceId',
-                       namespace=self.namespace)
-        name = findtext(element=instance, xpath='InstanceName',
-                        namespace=self.namespace)
-        instance_status = findtext(element=instance, xpath='Status',
-                                   namespace=self.namespace)
-        state = self.NODE_STATE_MAPPING.get(instance_status, NodeState.UNKNOWN)
-
-        def _get_ips(ip_address_els):
-            return [each.text for each in ip_address_els]
-
-        public_ip_els = findall(element=instance,
-                                xpath='PublicIpAddress/IpAddress',
-                                namespace=self.namespace)
-        public_ips = _get_ips(public_ip_els)
-        private_ip_els = findall(element=instance,
-                                 xpath='InnerIpAddress/IpAddress',
-                                 namespace=self.namespace)
-        private_ips = _get_ips(private_ip_els)
-
-        # Extra properties
-        extra = self._get_extra_dict(instance,
-                                     RESOURCE_EXTRA_ATTRIBUTES_MAP['node'])
-        extra['vpc_attributes'] = self._get_vpc_attributes(instance)
-        extra['eip_address'] = self._get_eip_address(instance)
-        extra['operation_locks'] = self._get_operation_locks(instance)
-
-        node = Node(id=_id, name=name, state=state,
-                    public_ips=public_ips, private_ips=private_ips,
-                    driver=self.connection.driver, extra=extra)
-        return node
-
-    def _get_extra_dict(self, element, mapping):
-        """
-        Extract attributes from the element based on rules provided in the
-        mapping dictionary.
-
-        :param      element: Element to parse the values from.
-        :type       element: xml.etree.ElementTree.Element.
-
-        :param      mapping: Dictionary with the extra layout
-        :type       node: :class:`Node`
-
-        :rtype: ``dict``
-        """
-        extra = {}
-        for attribute, values in mapping.items():
-            transform_func = values['transform_func']
-            value = findattr(element=element,
-                             xpath=values['xpath'],
-                             namespace=self.namespace)
-            if value:
-                try:
-                    extra[attribute] = transform_func(value)
-                except Exception:
-                    extra[attribute] = None
-            else:
-                extra[attribute] = value
-
-        return extra
-
-    def _get_vpc_attributes(self, instance):
-        vpcs = findall(instance, xpath='VpcAttributes',
-                       namespace=self.namespace)
-        if len(vpcs) <= 0:
-            return None
-        return self._get_extra_dict(
-            vpcs[0], RESOURCE_EXTRA_ATTRIBUTES_MAP['vpc_attributes'])
-
-    def _get_eip_address(self, instance):
-        eips = findall(instance, xpath='EipAddress',
-                       namespace=self.namespace)
-        if len(eips) <= 0:
-            return None
-        return self._get_extra_dict(
-            eips[0], RESOURCE_EXTRA_ATTRIBUTES_MAP['eip_address_associate'])
-
-    def _get_operation_locks(self, instance):
-        locks = findall(instance, xpath='OperationLocks',
-                        namespace=self.namespace)
-        if len(locks) <= 0:
-            return None
-        return self._get_extra_dict(
-            locks[0], RESOURCE_EXTRA_ATTRIBUTES_MAP['operation_locks'])
-
-    def _wait_until_state(self, nodes, state, wait_period=3, timeout=600):
-        """
-        Block until the provided nodes are in the desired state.
-        :param nodes: List of nodes to wait for
-        :type nodes: ``list`` of :class:`.Node`
-        :param state: desired state
-        :type state: ``NodeState``
-        :param wait_period: How many seconds to wait between each loop
-                            iteration. (default is 3)
-        :type wait_period: ``int``
-        :param timeout: How many seconds to wait before giving up.
-                        (default is 600)
-        :type timeout: ``int``
-        :return: if the nodes are in the desired state.
-        :rtype: ``bool``
-        """
-        start = time.time()
-        end = start + timeout
-        node_ids = [node.id for node in nodes]
-
-        while(time.time() < end):
-            matched_nodes = self.list_nodes(ex_node_ids=node_ids)
-            if len(matched_nodes) > len(node_ids):
-                found_ids = [node.id for node in matched_nodes]
-                msg = ('found multiple nodes with same ids, '
-                       'desired ids: %(ids)s, found ids: %(found_ids)s' %
-                       {'ids': node_ids, 'found_ids': found_ids})
-                raise LibcloudError(value=msg, driver=self)
-            desired_nodes = [node for node in matched_nodes
-                             if node.state == state]
-
-            if len(desired_nodes) == len(node_ids):
-                return True
-            else:
-                time.sleep(wait_period)
-                continue
-
-        raise LibcloudError(value='Timed out after %s seconds' % (timeout),
-                            driver=self)
-
-    def _to_volume(self, element):
-        _id = findtext(element, 'DiskId', namespace=self.namespace)
-        name = findtext(element, 'DiskName', namespace=self.namespace)
-        size = int(findtext(element, 'Size', namespace=self.namespace))
-        status_str = findtext(element, 'Status', namespace=self.namespace)
-        status = self.VOLUME_STATE_MAPPING.get(status_str,
-                                               StorageVolumeState.UNKNOWN)
-
-        extra = self._get_extra_dict(element,
-                                     RESOURCE_EXTRA_ATTRIBUTES_MAP['volume'])
-        extra['operation_locks'] = self._get_operation_locks(element)
-        return StorageVolume(_id, name, size, self, state=status, extra=extra)
-
-    def _list_to_json_array(self, value):
-        try:
-            return json.dumps(value)
-        except Exception:
-            raise AttributeError('could not convert list to json array')
-
-    def _to_snapshot(self, element):
-        _id = findtext(element, 'SnapshotId', namespace=self.namespace)
-        created = findtext(element, 'CreationTime', namespace=self.namespace)
-        status_str = findtext(element, 'Status', namespace=self.namespace)
-        state = self.SNAPSHOT_STATE_MAPPING.get(status_str,
-                                                VolumeSnapshotState.UNKNOWN)
-        extra = self._get_extra_dict(element,
-                                     RESOURCE_EXTRA_ATTRIBUTES_MAP['snapshot'])
-        return VolumeSnapshot(id=_id, driver=self, extra=extra,
-                              created=created, state=state)
-
-    def _to_size(self, element):
-        _id = findtext(element, 'InstanceTypeId', namespace=self.namespace)
-        ram = float(findtext(element, 'MemorySize', namespace=self.namespace))
-        extra = {}
-        extra['cpu_core_count'] = int(findtext(element, 'CpuCoreCount',
-                                               namespace=self.namespace))
-        extra['instance_type_family'] = findtext(element, 'InstanceTypeFamily',
-                                                 namespace=self.namespace)
-        return NodeSize(id=_id, name=_id, ram=ram, disk=None, bandwidth=None,
-                        price=None, driver=self, extra=extra)
-
-    def _to_location(self, element):
-        _id = findtext(element, 'RegionId', namespace=self.namespace)
-        localname = findtext(element, 'LocalName', namespace=self.namespace)
-        return NodeLocation(id=_id, name=localname, country=None, driver=self)
-
-    def _to_image(self, element):
-        _id = findtext(element, 'ImageId', namespace=self.namespace)
-        name = findtext(element, 'ImageName', namespace=self.namespace)
-        extra = self._get_extra_dict(element,
-                                     RESOURCE_EXTRA_ATTRIBUTES_MAP['image'])
-        extra['disk_device_mappings'] = self._get_disk_device_mappings(
-            element.find('DiskDeviceMappings'))
-        return NodeImage(id=_id, name=name, driver=self, extra=extra)
-
-    def _get_disk_device_mappings(self, element):
-        if element is None:
-            return None
-        mapping_element = element.find('DiskDeviceMapping')
-        if mapping_element is not None:
-            return self._get_extra_dict(
-                mapping_element,
-                RESOURCE_EXTRA_ATTRIBUTES_MAP['disk_device_mapping'])
-        return None
-
-    def _to_security_group(self, element):
-        _id = findtext(element, 'SecurityGroupId', namespace=self.namespace)
-        name = findtext(element, 'SecurityGroupName',
-                        namespace=self.namespace)
-        description = findtext(element, 'Description',
-                               namespace=self.namespace)
-        vpc_id = findtext(element, 'VpcId', namespace=self.namespace)
-        creation_time = findtext(element, 'CreationTime',
-                                 namespace=self.namespace)
-        return ECSSecurityGroup(_id, name, description=description,
-                                driver=self, vpc_id=vpc_id,
-                                creation_time=creation_time)
-
-    def _to_zone(self, element):
-        _id = findtext(element, 'ZoneId', namespace=self.namespace)
-        local_name = findtext(element, 'LocalName', namespace=self.namespace)
-        resource_types = findall(element,
-                                 'AvailableResourceCreation/ResourceTypes',
-                                 namespace=self.namespace)
-        instance_types = findall(element,
-                                 'AvailableInstanceTypes/InstanceTypes',
-                                 namespace=self.namespace)
-        disk_categories = findall(element,
-                                  'AvailableDiskCategories/DiskCategories',
-                                  namespace=self.namespace)
-
-        def _text(element):
-            return element.text
-
-        return ECSZone(id=_id, name=local_name, driver=self,
-                       available_resource_types=list(
-                           map(_text, resource_types)),
-                       available_instance_types=list(
-                           map(_text, instance_types)),
-                       available_disk_categories=list(
-                           map(_text, disk_categories)))
-
-    def _get_pagination(self, element):
-        page_number = int(findtext(element, 'PageNumber'))
-        total_count = int(findtext(element, 'TotalCount'))
-        page_size = int(findtext(element, 'PageSize'))
-        return Pagination(total=total_count, size=page_size,
-                          current=page_number)
-
-    def _request_multiple_pages(self, path, params, parse_func):
-        """
-        Request all resources by multiple pages.
-        :param path: the resource path
-        :type path: ``str``
-        :param params: the query parameters
-        :type params: ``dict``
-        :param parse_func: the function object to parse the response body
-        :param type: ``function``
-        :return: list of resource object, if not found any, return []
-        :rtype: ``list``
-        """
-        results = []
-        while True:
-            one_page = self.connection.request(path, params).object
-            resources = parse_func(one_page)
-            results += resources
-            pagination = self._get_pagination(one_page)
-            if pagination.next() is None:
-                break
-            params.update(pagination.to_dict())
-        return results
-
-
-def _parse_bool(value):
-    if isinstance(value, bool):
-        return value
-    if u(value).lower() == 'true':
-        return True
-    return False
+def _parse_bool(value):
+    if isinstance(value, bool):
+        return value
+    if u(value).lower() == 'true':
+        return True
+    return False
 
 
 """
@@ -1388,3 +347,1148 @@ RESOURCE_EXTRA_ATTRIBUTES_MAP = {
         }
     }
 }
+
+
+class ECSConnection(SignedAliyunConnection):
+    """
+    Represents a single connection to the Aliyun ECS Endpoint.
+    """
+
+    version = ECS_API_VERSION
+    host = ECS_API_ENDPOINT
+    responseCls = AliyunXmlResponse
+    service_name = 'ecs'
+
+
+class ECSSecurityGroup(object):
+    """
+    Security group used to control nodes internet and intranet accessibility.
+    """
+    def __init__(self, id, name, description=None, driver=None, vpc_id=None,
+                 creation_time=None):
+        self.id = id
+        self.name = name
+        self.description = description
+        self.driver = driver
+        self.vpc_id = vpc_id
+        self.creation_time = creation_time
+
+    def __repr__(self):
+        return ('<ECSSecurityGroup: id=%s, name=%s, driver=%s ...>' %
+                (self.id, self.name, self.driver.name))
+
+
+class ECSZone(object):
+    """
+    ECSZone used to represent an availability zone in a region.
+    """
+    def __init__(self, id, name, driver=None,
+                 available_resource_types=None,
+                 available_instance_types=None,
+                 available_disk_categories=None):
+        self.id = id
+        self.name = name
+        self.driver = driver
+        self.available_resource_types = available_resource_types
+        self.available_instance_types = available_instance_types
+        self.available_disk_categories = available_disk_categories
+
+    def __repr__(self):
+        return ('<ECSZone: id=%s, name=%s, driver=%s>' %
+                (self.id, self.name, self.driver))
+
+
+class InternetChargeType(object):
+    """
+    Internet connection billing types for Aliyun Nodes.
+    """
+    BY_BANDWIDTH = 'PayByBandwidth'
+    BY_TRAFFIC = 'PayByTraffic'
+
+
+class DiskCategory(object):
+    """
+    Enum defined disk types supported by Aliyun system and data disks.
+    """
+    CLOUD = 'cloud'
+    CLOUD_EFFICIENCY = 'cloud_efficiency'
+    CLOUD_SSD = 'cloud_ssd'
+    EPHEMERAL_SSD = 'ephemeral_ssd'
+
+
+class Pagination(object):
+    """
+    Pagination used to describe the multiple pages results.
+    """
+    def __init__(self, total, size, current):
+        """
+        Create a pagination.
+
+        :param total: the total count of the results
+        :param size: the page size of each page
+        :param current: the current page number, 1-based
+        """
+        self.total = total
+        self.size = size
+        self.current = current
+
+    def next(self):
+        """
+        Switch to the next page.
+        :return: the new pagination or None when no more page
+        :rtype: ``Pagination``
+        """
+        if self.total is None or (self.size * self.current >= self.total):
+            return None
+        self.current += 1
+        return self
+
+    def to_dict(self):
+        return {'PageNumber': self.current,
+                'PageSize': self.size}
+
+    def __repr__(self):
+        return ('<Pagination total=%d, size=%d, current page=%d>' %
+                (self.total, self.size, self.current))
+
+
+class ECSDriver(NodeDriver):
+    """
+    Aliyun ECS node driver.
+
+    Used for Aliyun ECS service.
+    """
+
+    name = 'Aliyun ECS'
+    website = 'https://www.aliyun.com/product/ecs'
+    connectionCls = ECSConnection
+    features = {'create_node': ['password']}
+    namespace = None
+    path = '/'
+
+    internet_charge_types = InternetChargeType
+    disk_categories = DiskCategory
+
+    NODE_STATE_MAPPING = {
+        'Starting': NodeState.PENDING,
+        'Running': NodeState.RUNNING,
+        'Stopping': NodeState.PENDING,
+        'Stopped': NodeState.STOPPED
+    }
+
+    VOLUME_STATE_MAPPING = {
+        'In_use': StorageVolumeState.INUSE,
+        'Available': StorageVolumeState.AVAILABLE,
+        'Attaching': StorageVolumeState.ATTACHING,
+        'Detaching': StorageVolumeState.INUSE,
+        'Creating': StorageVolumeState.CREATING,
+        'ReIniting': StorageVolumeState.CREATING}
+
+    SNAPSHOT_STATE_MAPPING = {
+        'progressing': VolumeSnapshotState.CREATING,
+        'accomplished': VolumeSnapshotState.AVAILABLE,
+        'failed': VolumeSnapshotState.ERROR}
+
+    def list_nodes(self, ex_node_ids=None, ex_filters=None):
+        """
+        List all nodes.
+
+        @inherits: :class:`NodeDriver.create_node`
+
+        :keyword  ex_node_ids: a list of node's ids used to filter nodes.
+                               Only the nodes which's id in this list
+                               will be returned.
+        :type   ex_node_ids: ``list`` of ``str``
+        :keyword  ex_filters: node attribute and value pairs to filter nodes.
+                              Only the nodes which matchs all the pairs will
+                              be returned.
+                              If the filter attribute need a json array value,
+                              use ``list`` object, the driver will convert it.
+        :type   ex_filters: ``dict``
+        """
+
+        params = {'Action': 'DescribeInstances',
+                  'RegionId': self.region}
+
+        if ex_node_ids:
+            if isinstance(ex_node_ids, list):
+                params['InstanceIds'] = self._list_to_json_array(ex_node_ids)
+            else:
+                raise AttributeError('ex_node_ids should be a list of '
+                                     'node ids.')
+
+        if ex_filters:
+            if isinstance(ex_filters, dict):
+                params.update(ex_filters)
+            else:
+                raise AttributeError('ex_filters should be a dict of '
+                                     'node attributes.')
+
+        nodes = self._request_multiple_pages(self.path, params,
+                                             self._to_nodes)
+        return nodes
+
+    def list_sizes(self, location=None):
+        params = {'Action': 'DescribeInstanceTypes'}
+
+        resp_body = self.connection.request(self.path, params).object
+        size_elements = findall(resp_body, 'InstanceTypes/InstanceType',
+                                namespace=self.namespace)
+        sizes = [self._to_size(each) for each in size_elements]
+        return sizes
+
+    def list_locations(self):
+        params = {'Action': 'DescribeRegions'}
+
+        resp_body = self.connection.request(self.path, params).object
+        location_elements = findall(resp_body, 'Regions/Region',
+                                    namespace=self.namespace)
+        locations = [self._to_location(each) for each in location_elements]
+        return locations
+
+    def create_node(self, name, size, image, auth=None,
+                    ex_security_group_id=None, ex_description=None,
+                    ex_internet_charge_type=None,
+                    ex_internet_max_bandwidth_out=None,
+                    ex_internet_max_bandwidth_in=None,
+                    ex_hostname=None, ex_io_optimized=None,
+                    ex_system_disk=None, ex_data_disks=None,
+                    ex_vswitch_id=None, ex_private_ip_address=None,
+                    ex_client_token=None, **kwargs):
+        """
+        @inherits: :class:`NodeDriver.create_node`
+
+        :param name: The name for this new node (required)
+        :type name: ``str``
+
+        :param image: The image to use when creating this node (required)
+        :type image: `NodeImage`
+
+        :param size: The size of the node to create (required)
+        :type size: `NodeSize`
+
+        :keyword auth: Initial authentication information for the node
+                       (optional)
+        :type auth: :class:`NodeAuthSSHKey` or :class:`NodeAuthPassword`
+
+        :keyword ex_security_group_id: The id of the security group the
+                                       new created node is attached to.
+                                       (required)
+        :type ex_security_group_id: ``str``
+
+        :keyword ex_description: A description string for this node (optional)
+        :type ex_description: ``str``
+
+        :keyword ex_internet_charge_type: The internet charge type (optional)
+        :type ex_internet_charge_type: a ``str`` of 'PayByTraffic'
+                                       or 'PayByBandwidth'
+
+        :keyword ex_internet_max_bandwidth_out: The max output bandwidth,
+                                                in Mbps (optional)
+                                                Required for 'PayByTraffic'
+                                                internet charge type
+        :type ex_internet_max_bandwidth_out: a ``int`` in range [0, 100]
+                                             a ``int`` in range [1, 100] for
+                                             'PayByTraffic' internet charge
+                                             type
+
+        :keyword ex_internet_max_bandwidth_in: The max input bandwidth,
+                                               in Mbps (optional)
+        :type ex_internet_max_bandwidth_in: a ``int`` in range [1, 200]
+                                            default to 200 in server side
+
+        :keyword ex_hostname: The hostname for the node (optional)
+        :type ex_hostname: ``str``
+
+        :keyword ex_io_optimized: Whether the node is IO optimized (optional)
+        :type ex_io_optimized: ``boll``
+
+        :keyword ex_system_disk: The system disk for the node (optional)
+        :type ex_system_disk: ``dict``
+
+        :keyword ex_data_disks: The data disks for the node (optional)
+        :type ex_data_disks: a `list` of `dict`
+
+        :keyword ex_vswitch_id: The id of vswitch for a VPC type node
+                                (optional)
+        :type ex_vswitch_id: ``str``
+
+        :keyword ex_private_ip_address: The IP address in private network
+                                        (optional)
+        :type ex_private_ip_address: ``str``
+
+        :keyword ex_client_token: A token generated by client to keep
+                                  requests idempotency (optional)
+        :type keyword ex_client_token: ``str``
+        """
+
+        params = {'Action': 'CreateInstance',
+                  'RegionId': self.region,
+                  'ImageId': image.id,
+                  'InstanceType': size.id,
+                  'InstanceName': name}
+
+        if not ex_security_group_id:
+            raise AttributeError('ex_security_group_id is mandatory')
+        params['SecurityGroupId'] = ex_security_group_id
+
+        if ex_description:
+            params['Description'] = ex_description
+
+        inet_params = self._get_internet_related_params(
+            ex_internet_charge_type,
+            ex_internet_max_bandwidth_in,
+            ex_internet_max_bandwidth_out)
+        if inet_params:
+            params.update(inet_params)
+
+        if ex_hostname:
+            params['HostName'] = ex_hostname
+
+        if auth:
+            auth = self._get_and_check_auth(auth)
+            params['Password'] = auth.password
+
+        if ex_io_optimized is not None:
+            optimized = ex_io_optimized
+            if not isinstance(optimized, bool):
+                optimized = str(optimized).lower() == 'true'
+            params['IoOptimized'] = 'true' if optimized else 'false'
+
+        if ex_system_disk:
+            system_disk = self._get_system_disk(ex_system_disk)
+            if system_disk:
+                params.update(system_disk)
+
+        if ex_data_disks:
+            data_disks = self._get_data_disks(ex_data_disks)
+            if data_disks:
+                params.update(data_disks)
+
+        if ex_vswitch_id:
+            params['VSwitchId'] = ex_vswitch_id
+
+        if ex_private_ip_address:
+            if not ex_vswitch_id:
+                raise AttributeError('must provide ex_private_ip_address  '
+                                     'and ex_vswitch_id at the same time')
+            else:
+                params['PrivateIpAddress'] = ex_private_ip_address
+
+        if ex_client_token:
+            params['ClientToken'] = ex_client_token
+
+        resp = self.connection.request(self.path, params=params)
+        node_id = findtext(resp.object, xpath='InstanceId',
+                           namespace=self.namespace)
+        nodes = self.list_nodes(ex_node_ids=[node_id])
+        if len(nodes) != 1:
+            raise LibcloudError('could not find the new created node '
+                                'with id %s. ' % node_id,
+                                driver=self)
+        node = nodes[0]
+        self.ex_start_node(node)
+        self._wait_until_state(nodes, NodeState.RUNNING)
+        return node
+
+    def reboot_node(self, node, ex_force_stop=False):
+        """
+        @inherits :class:`NodeDriver.reboot_node`
+        :keyword ex_force_stop: if ``True``, stop node force (maybe lose data)
+                                otherwise, stop node normally,
+                                default to ``False``
+        :type ex_force_stop: ``bool``
+        """
+        params = {'Action': 'RebootInstance',
+                  'InstanceId': node.id,
+                  'ForceStop': u(ex_force_stop).lower()}
+        resp = self.connection.request(self.path, params=params)
+        return resp.success() and \
+            self._wait_until_state([node], NodeState.RUNNING)
+
+    def destroy_node(self, node):
+        nodes = self.list_nodes(ex_node_ids=[node.id])
+        if len(nodes) != 1 and node.id != nodes[0].id:
+            raise LibcloudError('could not find the node with id %s.'
+                                % node.id)
+        current = nodes[0]
+        if current.state == NodeState.RUNNING:
+            # stop node first
+            self.ex_stop_node(node)
+            self._wait_until_state(nodes, NodeState.STOPPED)
+        params = {'Action': 'DeleteInstance',
+                  'InstanceId': node.id}
+        resp = self.connection.request(self.path, params)
+        return resp.success()
+
+    def ex_start_node(self, node):
+        """
+        Start node to running state.
+
+        :param node: ``Node`` object
+        :return: starting operation result.
+        :rtype: ``bool``
+        """
+        params = {'Action': 'StartInstance',
+                  'InstanceId': node.id}
+        resp = self.connection.request(self.path, params)
+        return resp.success() and \
+            self._wait_until_state([node], NodeState.RUNNING)
+
+    def ex_stop_node(self, node, ex_force_stop=False):
+        """
+        Stop a running node.
+
+        :param node: The node to stop
+        :type node: :class:`Node`
+        :keyword ex_force_stop: if ``True``, stop node force (maybe lose data)
+                                otherwise, stop node normally,
+                                default to ``False``
+        :type ex_force_stop: ``bool``
+        :return: stopping operation result.
+        :rtype: ``bool``
+        """
+        params = {'Action': 'StopInstance',
+                  'InstanceId': node.id,
+                  'ForceStop': u(ex_force_stop).lower()}
+        resp = self.connection.request(self.path, params)
+        return resp.success() and \
+            self._wait_until_state([node], NodeState.STOPPED)
+
+    def ex_list_security_groups(self, ex_filters=None):
+        """
+        List security groups in the current region.
+
+        :keyword ex_filters: security group attributes to filter results.
+        :type ex_filters: ``dict``
+        :return: a list of defined security groups
+        :rtype: ``list`` of ``ECSSecurityGroup``
+        """
+        params = {'Action': 'DescribeSecurityGroups',
+                  'RegionId': self.region}
+
+        if ex_filters and isinstance(ex_filters, dict):
+            ex_filters.update(params)
+            params = ex_filters
+
+        def _parse_response(resp_object):
+            sg_elements = findall(resp_object, 'SecurityGroups/SecurityGroup',
+                                  namespace=self.namespace)
+            sgs = [self._to_security_group(el) for el in sg_elements]
+            return sgs
+        return self._request_multiple_pages(self.path, params,
+                                            _parse_response)
+
+    def ex_list_zones(self, region_id=None):
+        """
+        List availability zones in the given region or the current region.
+        :keyword region_id: the id of the region to query zones from
+        :type region_id: ``str``
+        :return: list of zones
+        :rtype: ``list`` of ``ECSZone``
+        """
+        params = {'Action': 'DescribeZones'}
+        if region_id:
+            params['RegionId'] = region_id
+        else:
+            params['RegionId'] = self.region
+        resp_body = self.connection.request(self.path, params).object
+        zone_elements = findall(resp_body, 'Zones/Zone',
+                                namespace=self.namespace)
+        zones = [self._to_zone(el) for el in zone_elements]
+        return zones
+
+    ##
+    # Volume and snapshot management methods
+    ##
+
+    def list_volumes(self, ex_volume_ids=None, ex_filters=None):
+        """
+        List all volumes.
+
+        @inherits: :class:`NodeDriver.list_volumes`
+
+        :keyword  ex_volume_ids: a list of volume's ids used to filter volumes.
+                                 Only the volumes which's id in this list
+                                 will be returned.
+        :type   ex_volume_ids: ``list`` of ``str``
+        :keyword  ex_filters: volume attribute and value pairs to filter
+                              volumes. Only the volumes which matchs all will
+                              be returned.
+                              If the filter attribute need a json array value,
+                              use ``list`` object, the driver will convert it.
+        :type   ex_filters: ``dict``
+        """
+        params = {'Action': 'DescribeDisks',
+                  'RegionId': self.region}
+
+        if ex_volume_ids:
+            if isinstance(ex_volume_ids, list):
+                params['DiskIds'] = self._list_to_json_array(ex_volume_ids)
+            else:
+                raise AttributeError('ex_volume_ids should be a list of '
+                                     'volume ids.')
+
+        if ex_filters:
+            if not isinstance(ex_filters, dict):
+                raise AttributeError('ex_filters should be a dict of '
+                                     'volume attributes.')
+            else:
+                for key in ex_filters.keys():
+                    params[key] = ex_filters[key]
+
+        def _parse_response(resp_object):
+            disk_elements = findall(resp_object, 'Disks/Disk',
+                                    namespace=self.namespace)
+            volumes = [self._to_volume(each) for each in disk_elements]
+            return volumes
+        return self._request_multiple_pages(self.path, params,
+                                            _parse_response)
+
+    def list_volume_snapshots(self, volume, ex_snapshot_ids=[],
+                              ex_filters=None):
+        """
+        List snapshots for a storage volume.
+
+        @inherites :class:`NodeDriver.list_volume_snapshots`
+        :keyword ex_snapshot_ids: a list of snapshot ids to filter the
+                                  snapshots returned.
+        :type ex_snapshot_ids: ``list`` of ``str``
+        :keyword ex_filters: snapshot attribute and value pairs to filter
+                             snapshots. Only the snapshot which matchs all
+                             the pairs will be returned.
+                             If the filter attribute need a json array value,
+                             use ``list`` object, the driver will convert it.
+        :type   ex_filters: ``dict``
+        """
+        params = {'Action': 'DescribeSnapshots',
+                  'RegionId': self.region}
+
+        if volume:
+            params['DiskId'] = volume.id
+        if ex_snapshot_ids and isinstance(ex_snapshot_ids, list):
+            params['SnapshotIds'] = self._list_to_json_array(ex_snapshot_ids)
+        if ex_filters and isinstance(ex_filters, dict):
+            for key in ex_filters.keys():
+                params[key] = ex_filters[key]
+
+        def _parse_response(resp_body):
+            snapshot_elements = findall(resp_body, 'Snapshots/Snapshot',
+                                        namespace=self.namespace)
+            snapshots = [self._to_snapshot(each) for each in snapshot_elements]
+            return snapshots
+
+        return self._request_multiple_pages(self.path, params,
+                                            _parse_response)
+
+    def create_volume(self, size, name, location=None, snapshot=None,
+                      ex_zone_id=None, ex_description=None,
+                      ex_disk_category=None, ex_client_token=None):
+        """
+        Create a new volume.
+
+        @inherites :class:`NodeDriver.create_volume`
+        :keyword ex_zone_id: the availability zone id (required)
+        :type ex_zone_id: ``str``
+        :keyword ex_description: volume description
+        :type ex_description: ``unicode``
+        :keyword ex_disk_category: disk category for data disk
+        :type ex_disk_category: ``str``
+        :keyword ex_client_token: a token generated by client to identify
+                                each request.
+        :type ex_client_token: ``str``
+        """
+        params = {'Action': 'CreateDisk',
+                  'RegionId': self.region,
+                  'DiskName': name,
+                  'Size': size}
+        if ex_zone_id is None:
+            raise AttributeError('ex_zone_id is required')
+        params['ZoneId'] = ex_zone_id
+
+        if snapshot is not None and isinstance(snapshot, VolumeSnapshot):
+            params['SnapshotId'] = snapshot.id
+        if ex_description:
+            params['Description'] = ex_description
+        if ex_disk_category:
+            params['DiskCategory'] = ex_disk_category
+        if ex_client_token:
+            params['ClientToken'] = ex_client_token
+        resp = self.connection.request(self.path, params).object
+        volume_id = findtext(resp, 'DiskId', namespace=self.namespace)
+        volumes = self.list_volumes(ex_volume_ids=[volume_id])
+        if len(volumes) != 1:
+            raise LibcloudError('could not find the new create volume '
+                                'with id %s.' % volume_id,
+                                driver=self)
+        return volumes[0]
+
+    def create_volume_snapshot(self, volume, name=None, ex_description=None,
+                               ex_client_token=None):
+        """
+        Creates a snapshot of the storage volume.
+        @inherits :class:`NodeDriver.create_volume_snapshot`
+        :keyword ex_description: description of the snapshot.
+        :type ex_description: ``unicode``
+        :keyword ex_client_token: a token generated by client to identify
+                                each request.
+        :type ex_client_token: ``str``
+        """
+        params = {'Action': 'CreateSnapshot',
+                  'DiskId': volume.id}
+        if name:
+            params['SnapshotName'] = name
+        if ex_description:
+            params['Description'] = ex_description
+        if ex_client_token:
+            params['ClientToken'] = ex_client_token
+
+        snapshot_elements = self.connection.request(self.path, params).object
+        snapshot_id = findtext(snapshot_elements, 'SnapshotId',
+                               namespace=self.namespace)
+        snapshots = self.list_volume_snapshots(volume=None,
+                                               ex_snapshot_ids=[snapshot_id])
+        if len(snapshots) != 1:
+            raise LibcloudError('could not find new created snapshot with '
+                                'id %s.' % snapshot_id, driver=self)
+        return snapshots[0]
+
+    def attach_volume(self, node, volume, device=None,
+                      ex_delete_with_instance=None):
+        """
+        Attaches volume to node.
+
+        @inherits :class:`NodeDriver.attach_volume`
+
+        :keyword ex_delete_with_instance: if to delete this volume when the
+                                        instance is deleted.
+        :type ex_delete_with_instance: ``bool``
+        """
+        params = {'Action': 'AttachDisk',
+                  'InstanceId': node.id,
+                  'DiskId': volume.id}
+
+        if device:
+            params['Device'] = device
+        if ex_delete_with_instance:
+            params['DeleteWithInstance'] = \
+                str(bool(ex_delete_with_instance)).lower()
+        resp = self.connection.request(self.path, params)
+        return resp.success()
+
+    def detach_volume(self, volume, ex_instance_id=None):
+        """
+        Detaches a volume from a node.
+
+        @inherits :class:`NodeDriver.detach_volume`
+
+        :keyword ex_instance_id: the id of the instance from which the volume
+                                 is detached.
+        :type ex_instance_id: ``str``
+        """
+        params = {'Action': 'DetachDisk',
+                  'DiskId': volume.id}
+
+        if ex_instance_id:
+            params['InstanceId'] = ex_instance_id
+        else:
+            volumes = self.list_volumes(ex_volume_ids=[volume.id])
+            if len(volumes) != 1:
+                raise AttributeError('could not find the instance id '
+                                     'the volume %s attached to, '
+                                     'ex_instance_id is required.' %
+                                     volume.id)
+            params['InstanceId'] = volumes[0].extra['instance_id']
+
+        resp = self.connection.request(self.path, params)
+        return resp.success()
+
+    def destroy_volume(self, volume):
+        params = {'Action': 'DeleteDisk',
+                  'DiskId': volume.id}
+        volumes = self.list_volumes(ex_volume_ids=[volume.id])
+        if len(volumes) != 1:
+            raise LibcloudError('could not find the volume with id %s.' %
+                                volume.id,
+                                driver=self)
+        if volumes[0].state != StorageVolumeState.AVAILABLE:
+            raise LibcloudError('only volume in AVAILABLE state could be '
+                                'destroyed.', driver=self)
+        resp = self.connection.request(self.path, params)
+        return resp.success()
+
+    def destroy_volume_snapshot(self, snapshot):
+        params = {'Action': 'DeleteSnapshot'}
+
+        if snapshot and isinstance(snapshot, VolumeSnapshot):
+            params['SnapshotId'] = snapshot.id
+        else:
+            raise AttributeError('snapshot is required and must be a '
+                                 'VolumeSnapshot')
+        resp = self.connection.request(self.path, params)
+        return resp.success()
+
+    ##
+    # Image management methods
+    ##
+
+    def list_images(self, location=None, ex_image_ids=None, ex_filters=None):
+        """
+        List images on a provider.
+        @inherits :class:`NodeDriver.list_images`
+        :keyword ex_image_ids: a list of image ids to filter the images to
+                               be returned.
+        :type ex_image_ids: ``list`` of ``str``
+        :keyword ex_filters: image attribute and value pairs to filter
+                             images. Only the image which matchs all
+                             the pairs will be returned.
+                             If the filter attribute need a json array value,
+                             use ``list`` object, the driver will convert it.
+        :type   ex_filters: ``dict``
+        """
+
+        if location and isinstance(location, NodeLocation):
+            region = location.id
+        else:
+            region = self.region
+        params = {'Action': 'DescribeImages',
+                  'RegionId': region}
+        if ex_image_ids:
+            if isinstance(ex_image_ids, list):
+                params['ImageId'] = ','.join(ex_image_ids)
+            else:
+                raise AttributeError('ex_image_ids should be a list of '
+                                     'image ids')
+        if ex_filters and isinstance(ex_filters, dict):
+            for key in ex_filters.keys():
+                params[key] = ex_filters[key]
+
+        def _parse_response(resp_body):
+            image_elements = findall(resp_body, 'Images/Image',
+                                     namespace=self.namespace)
+            images = [self._to_image(each) for each in image_elements]
+            return images
+        return self._request_multiple_pages(self.path, params,
+                                            _parse_response)
+
+    def create_image(self, node, name, description=None, ex_snapshot_id=None,
+                     ex_image_version=None, ex_client_token=None):
+        """
+        Creates an image from a system disk snapshot.
+        @inherits :class:`NodeDriver.create_image`
+        :keyword ex_snapshot_id: the id of the snapshot to create the image.
+                                 (required)
+        :type ex_snapshot_id: ``str``
+        :keyword ex_image_version: the version number of the image
+        :type ex_image_version: ``str``
+        :keyword ex_client_token: a token generated by client to identify
+                                each request.
+        :type ex_client_token: ``str``
+        """
+        params = {'Action': 'CreateImage',
+                  'RegionId': self.region}
+        if name:
+            params['ImageName'] = name
+        if description:
+            params['Description'] = description
+        if ex_snapshot_id:
+            params['SnapshotId'] = ex_snapshot_id
+        else:
+            raise AttributeError('ex_snapshot_id is required')
+        if ex_image_version:
+            params['ImageVersion'] = ex_image_version
+        if ex_client_token:
+            params['ClientToken'] = ex_client_token
+
+        resp = self.connection.request(self.path, params)
+        image_id = findtext(resp.object, 'ImageId', namespace=self.namespace)
+        return self.get_image(image_id=image_id)
+
+    def delete_image(self, node_image):
+        params = {'Action': 'DeleteImage',
+                  'RegionId': self.region,
+                  'ImageId': node_image.id}
+        resp = self.connection.request(self.path, params)
+        return resp.success()
+
+    def get_image(self, image_id, ex_region_id=None):
+        if ex_region_id:
+            region = ex_region_id
+        else:
+            region = self.region
+        location = NodeLocation(id=region, name=None, country=None,
+                                driver=self)
+        images = self.list_images(location, ex_image_ids=[image_id])
+        if len(images) != 1:
+            raise LibcloudError('could not find the image with id %s' %
+                                image_id,
+                                driver=self)
+        return images[0]
+
+    def copy_image(self, source_region, node_image, name, description=None,
+                   ex_destination_region_id=None, ex_client_token=None):
+        """
+        Copies an image from a source region to the destination region.
+        If not provide a destination region, default to the current region.
+        @inherits :class:`NodeDriver.copy_image`
+        :keyword ex_destination_region_id: id of the destination region
+        :type ex_destination_region_id: ``str``
+        :keyword ex_client_token: a token generated by client to identify
+                                each request.
+        :type ex_client_token: ``str``
+        """
+        params = {'Action': 'CopyImage',
+                  'RegionId': source_region,
+                  'ImageId': node_image.id}
+        if ex_destination_region_id is not None:
+            params['DestinationRegionId'] = ex_destination_region_id
+        else:
+            params['DestinationRegionId'] = self.region
+        if name:
+            params['DestinationImageName'] = name
+        if description:
+            params['DestinationDescription'] = description
+        if ex_client_token:
+            params['ClientToken'] = ex_client_token
+        resp = self.connection.request(self.path, params)
+        image_id = findtext(resp.object, 'ImageId', namespace=self.namespace)
+        return self.get_image(image_id=image_id)
+
+    def _to_nodes(self, object):
+        """
+        Convert response to Node object list
+
+        :param object: parsed response object
+        :return: a list of ``Node``
+        :rtype: ``list``
+        """
+        node_elements = findall(object, 'Instances/Instance', self.namespace)
+        return [self._to_node(el) for el in node_elements]
+
+    def _to_node(self, instance):
+        """
+        Convert an InstanceAttributesType object to ``Node`` object
+
+        :param instance: a xml element represents an instance
+        :return: a ``Node`` object
+        :rtype: ``Node``
+        """
+        _id = findtext(element=instance, xpath='InstanceId',
+                       namespace=self.namespace)
+        name = findtext(element=instance, xpath='InstanceName',
+                        namespace=self.namespace)
+        instance_status = findtext(element=instance, xpath='Status',
+                                   namespace=self.namespace)
+        state = self.NODE_STATE_MAPPING.get(instance_status, NodeState.UNKNOWN)
+
+        def _get_ips(ip_address_els):
+            return [each.text for each in ip_address_els]
+
+        public_ip_els = findall(element=instance,
+                                xpath='PublicIpAddress/IpAddress',
+                                namespace=self.namespace)
+        public_ips = _get_ips(public_ip_els)
+        private_ip_els = findall(element=instance,
+                                 xpath='InnerIpAddress/IpAddress',
+                                 namespace=self.namespace)
+        private_ips = _get_ips(private_ip_els)
+
+        # Extra properties
+        extra = self._get_extra_dict(instance,
+                                     RESOURCE_EXTRA_ATTRIBUTES_MAP['node'])
+        extra['vpc_attributes'] = self._get_vpc_attributes(instance)
+        extra['eip_address'] = self._get_eip_address(instance)
+        extra['operation_locks'] = self._get_operation_locks(instance)
+
+        node = Node(id=_id, name=name, state=state,
+                    public_ips=public_ips, private_ips=private_ips,
+                    driver=self.connection.driver, extra=extra)
+        return node
+
+    def _get_extra_dict(self, element, mapping):
+        """
+        Extract attributes from the element based on rules provided in the
+        mapping dictionary.
+
+        :param      element: Element to parse the values from.
+        :type       element: xml.etree.ElementTree.Element.
+
+        :param      mapping: Dictionary with the extra layout
+        :type       node: :class:`Node`
+
+        :rtype: ``dict``
+        """
+        extra = {}
+        for attribute, values in mapping.items():
+            transform_func = values['transform_func']
+            value = findattr(element=element,
+                             xpath=values['xpath'],
+                             namespace=self.namespace)
+            if value:
+                try:
+                    extra[attribute] = transform_func(value)
+                except Exception:
+                    extra[attribute] = None
+            else:
+                extra[attribute] = value
+
+        return extra
+
+    def _get_internet_related_params(self, ex_internet_charge_type,
+                                     ex_internet_max_bandwidth_in,
+                                     ex_internet_max_bandwidth_out):
+        params = {}
+        if ex_internet_charge_type:
+            params['InternetChargeType'] = ex_internet_charge_type
+            if ex_internet_charge_type.lower() == 'paybytraffic':
+                if ex_internet_max_bandwidth_out:
+                    params['InternetMaxBandwidthOut'] = \
+                        ex_internet_max_bandwidth_out
+                else:
+                    raise AttributeError('ex_internet_max_bandwidth_out is '
+                                         'mandatory for PayByTraffic internet'
+                                         ' charge type.')
+
+        if ex_internet_max_bandwidth_in:
+            params['InternetMaxBandwidthIn'] = \
+                ex_internet_max_bandwidth_in
+        return params
+
+    def _get_system_disk(self, ex_system_disk):
+        if not isinstance(ex_system_disk, dict):
+            raise AttributeError('ex_system_disk is not a dict')
+        sys_disk_dict = ex_system_disk
+        key_base = 'SystemDisk.'
+        # TODO(samsong8610): Use a type instead of dict
+        mappings = {'category': 'Category',
+                    'disk_name': 'DiskName',
+                    'description': 'Description'}
+        params = {}
+        for attr in mappings.keys():
+            if attr in sys_disk_dict:
+                params[key_base + mappings[attr]] = sys_disk_dict[attr]
+        return params
+
+    def _get_data_disks(self, ex_data_disks):
+        if isinstance(ex_data_disks, dict):
+            data_disks = [ex_data_disks]
+        elif isinstance(ex_data_disks, list):
+            data_disks = ex_data_disks
+        else:
+            raise AttributeError('ex_data_disks should be a list of dict')
+        # TODO(samsong8610): Use a type instead of dict
+        mappings = {'size': 'Size',
+                    'category': 'Category',
+                    'snapshot_id': 'SnapshotId',
+                    'disk_name': 'DiskName',
+                    'description': 'Description',
+                    'device': 'Device',
+                    'delete_with_instance': 'DeleteWithInstance'}
+        params = {}
+        for idx, disk in enumerate(data_disks):
+            key_base = 'DataDisk.{0}.'.format(idx + 1)
+            for attr in mappings.keys():
+                if attr in disk:
+                    if attr == 'delete_with_instance':
+                        # Convert bool value to str
+                        value = str(disk[attr]).lower()
+                    else:
+                        value = disk[attr]
+                    params[key_base + mappings[attr]] = value
+        return params
+
+    def _get_vpc_attributes(self, instance):
+        vpcs = findall(instance, xpath='VpcAttributes',
+                       namespace=self.namespace)
+        if len(vpcs) <= 0:
+            return None
+        return self._get_extra_dict(
+            vpcs[0], RESOURCE_EXTRA_ATTRIBUTES_MAP['vpc_attributes'])
+
+    def _get_eip_address(self, instance):
+        eips = findall(instance, xpath='EipAddress',
+                       namespace=self.namespace)
+        if len(eips) <= 0:
+            return None
+        return self._get_extra_dict(
+            eips[0], RESOURCE_EXTRA_ATTRIBUTES_MAP['eip_address_associate'])
+
+    def _get_operation_locks(self, instance):
+        locks = findall(instance, xpath='OperationLocks',
+                        namespace=self.namespace)
+        if len(locks) <= 0:
+            return None
+        return self._get_extra_dict(
+            locks[0], RESOURCE_EXTRA_ATTRIBUTES_MAP['operation_locks'])
+
+    def _wait_until_state(self, nodes, state, wait_period=3, timeout=600):
+        """
+        Block until the provided nodes are in the desired state.
+        :param nodes: List of nodes to wait for
+        :type nodes: ``list`` of :class:`.Node`
+        :param state: desired state
+        :type state: ``NodeState``
+        :param wait_period: How many seconds to wait between each loop
+                            iteration. (default is 3)
+        :type wait_period: ``int``
+        :param timeout: How many seconds to wait before giving up.
+                        (default is 600)
+        :type timeout: ``int``
+        :return: if the nodes are in the desired state.
+        :rtype: ``bool``
+        """
+        start = time.time()
+        end = start + timeout
+        node_ids = [node.id for node in nodes]
+
+        while(time.time() < end):
+            matched_nodes = self.list_nodes(ex_node_ids=node_ids)
+            if len(matched_nodes) > len(node_ids):
+                found_ids = [node.id for node in matched_nodes]
+                msg = ('found multiple nodes with same ids, '
+                       'desired ids: %(ids)s, found ids: %(found_ids)s' %
+                       {'ids': node_ids, 'found_ids': found_ids})
+                raise LibcloudError(value=msg, driver=self)
+            desired_nodes = [node for node in matched_nodes
+                             if node.state == state]
+
+            if len(desired_nodes) == len(node_ids):
+                return True
+            else:
+                time.sleep(wait_period)
+                continue
+
+        raise LibcloudError(value='Timed out after %s seconds' % (timeout),
+                            driver=self)
+
+    def _to_volume(self, element):
+        _id = findtext(element, 'DiskId', namespace=self.namespace)
+        name = findtext(element, 'DiskName', namespace=self.namespace)
+        size = int(findtext(element, 'Size', namespace=self.namespace))
+        status_str = findtext(element, 'Status', namespace=self.namespace)
+        status = self.VOLUME_STATE_MAPPING.get(status_str,
+                                               StorageVolumeState.UNKNOWN)
+
+        extra = self._get_extra_dict(element,
+                                     RESOURCE_EXTRA_ATTRIBUTES_MAP['volume'])
+        extra['operation_locks'] = self._get_operation_locks(element)
+        return StorageVolume(_id, name, size, self, state=status, extra=extra)
+
+    def _list_to_json_array(self, value):
+        try:
+            return json.dumps(value)
+        except Exception:
+            raise AttributeError('could not convert list to json array')
+
+    def _to_snapshot(self, element):
+        _id = findtext(element, 'SnapshotId', namespace=self.namespace)
+        created = findtext(element, 'CreationTime', namespace=self.namespace)
+        status_str = findtext(element, 'Status', namespace=self.namespace)
+        state = self.SNAPSHOT_STATE_MAPPING.get(status_str,
+                                                VolumeSnapshotState.UNKNOWN)
+        extra = self._get_extra_dict(element,
+                                     RESOURCE_EXTRA_ATTRIBUTES_MAP['snapshot'])
+        return VolumeSnapshot(id=_id, driver=self, extra=extra,
+                              created=created, state=state)
+
+    def _to_size(self, element):
+        _id = findtext(element, 'InstanceTypeId', namespace=self.namespace)
+        ram = float(findtext(element, 'MemorySize', namespace=self.namespace))
+        extra = {}
+        extra['cpu_core_count'] = int(findtext(element, 'CpuCoreCount',
+                                               namespace=self.namespace))
+        extra['instance_type_family'] = findtext(element, 'InstanceTypeFamily',
+                                                 namespace=self.namespace)
+        return NodeSize(id=_id, name=_id, ram=ram, disk=None, bandwidth=None,
+                        price=None, driver=self, extra=extra)
+
+    def _to_location(self, element):
+        _id = findtext(element, 'RegionId', namespace=self.namespace)
+        localname = findtext(element, 'LocalName', namespace=self.namespace)
+        return NodeLocation(id=_id, name=localname, country=None, driver=self)
+
+    def _to_image(self, element):
+        _id = findtext(element, 'ImageId', namespace=self.namespace)
+        name = findtext(element, 'ImageName', namespace=self.namespace)
+        extra = self._get_extra_dict(element,
+                                     RESOURCE_EXTRA_ATTRIBUTES_MAP['image'])
+        extra['disk_device_mappings'] = self._get_disk_device_mappings(
+            element.find('DiskDeviceMappings'))
+        return NodeImage(id=_id, name=name, driver=self, extra=extra)
+
+    def _get_disk_device_mappings(self, element):
+        if element is None:
+            return None
+        mapping_element = element.find('DiskDeviceMapping')
+        if mapping_element is not None:
+            return self._get

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