# All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. import abc from os_brick import exception from os_brick import executor from os_brick import initiator class InitiatorConnector(executor.Executor, metaclass=abc.ABCMeta): # This object can be used on any platform (x86, S390) platform = initiator.PLATFORM_ALL # This object can be used on any os type (linux, windows) os_type = initiator.OS_TYPE_ALL def __init__(self, root_helper, driver=None, execute=None, device_scan_attempts=initiator.DEVICE_SCAN_ATTEMPTS_DEFAULT, *args, **kwargs): super(InitiatorConnector, self).__init__(root_helper, execute=execute, *args, **kwargs) self.device_scan_attempts = device_scan_attempts def set_driver(self, driver): """The driver is used to find used LUNs.""" self.driver = driver @staticmethod @abc.abstractmethod def get_connector_properties(root_helper, *args, **kwargs): """The generic connector properties.""" pass @abc.abstractmethod def check_valid_device(self, path, run_as_root=True): """Test to see if the device path is a real device. :param path: The file system path for the device. :type path: str :param run_as_root: run the tests as root user? :type run_as_root: bool :returns: bool """ pass @abc.abstractmethod def connect_volume(self, connection_properties): """Connect to a volume. The connection_properties describes the information needed by the specific protocol to use to make the connection. The connection_properties is a dictionary that describes the target volume. It varies slightly by protocol type (iscsi, fibre_channel), but the structure is usually the same. An example for iSCSI: {'driver_volume_type': 'iscsi', 'data': { 'target_luns': [0, 2], 'target_iqns': ['iqn.2000-05.com.3pardata:20810002ac00383d', 'iqn.2000-05.com.3pardata:21810002ac00383d'], 'target_discovered': True, 'encrypted': False, 'qos_specs': None, 'target_portals': ['10.52.1.11:3260', '10.52.2.11:3260'], 'access_mode': 'rw', }} An example for fibre_channel with single lun: {'driver_volume_type': 'fibre_channel', 'data': { 'initiator_target_map': {'100010604b010459': ['20210002AC00383D'], '100010604b01045d': ['20220002AC00383D']}, 'target_discovered': True, 'encrypted': False, 'qos_specs': None, 'target_lun': 1, 'access_mode': 'rw', 'target_wwn': [ '20210002AC00383D', '20220002AC00383D', ], }} An example for fibre_channel target_wwns and with different LUNs and all host ports mapped to target ports: {'driver_volume_type': 'fibre_channel', 'data': { 'initiator_target_map': { '100010604b010459': ['20210002AC00383D', '20220002AC00383D'], '100010604b01045d': ['20210002AC00383D', '20220002AC00383D'] }, 'target_discovered': True, 'encrypted': False, 'qos_specs': None, 'target_luns': [1, 2], 'access_mode': 'rw', 'target_wwns': ['20210002AC00383D', '20220002AC00383D'], }} For FC the dictionary could also present the enable_wildcard_scan key with a boolean value (defaults to True) in case a driver doesn't want OS-Brick to use a SCSI scan with wildcards when the FC initiator on the host doesn't find any target port. This is useful for drivers that know that sysfs gets populated whenever there's a connection between the host's HBA and the storage array's target ports. Encrypted volumes have some peculiar requirements on the path that must be returned, so it is recommended to decorate the method with the os_brick.utils.connect_volume_prepare_result to ensure that the right device path is returned to the caller. :param connection_properties: The dictionary that describes all of the target volume attributes. :type connection_properties: dict :returns: dict """ pass @abc.abstractmethod def disconnect_volume(self, connection_properties, device_info, force=False, ignore_errors=False): """Disconnect a volume from the local host. The connection_properties are the same as from connect_volume. The device_info is returned from connect_volume. If the connector's connect_volume is decorated with os_brick.utils.connect_volume_prepare_result then the path will have been changed by the decorator if the volume was encrypted, so if we need to have the original path that the connector returned instead of the modified one (for example to identify the WWN from the symlink) then we should use the os_brick.utils.connect_volume_undo_prepare_result decorator with the unlink_after=True parameter. :param connection_properties: The dictionary that describes all of the target volume attributes. :type connection_properties: dict :param device_info: historical difference, but same as connection_props :type device_info: dict :param force: Whether to forcefully disconnect even if flush fails. :type force: bool :param ignore_errors: When force is True, this will decide whether to ignore errors or raise an exception once finished the operation. Default is False. :type ignore_errors: bool """ pass @abc.abstractmethod def get_volume_paths(self, connection_properties): """Return the list of existing paths for a volume. The job of this method is to find out what paths in the system are associated with a volume as described by the connection_properties. :param connection_properties: The dictionary that describes all of the target volume attributes. :type connection_properties: dict """ pass @abc.abstractmethod def get_search_path(self): """Return the directory where a Connector looks for volumes. Some Connectors need the information in the connection_properties to determine the search path. """ pass @abc.abstractmethod def extend_volume(self, connection_properties): """Update the attached volume's size. This method will attempt to update the local hosts's volume after the volume has been extended on the remote system. The new volume size in bytes will be returned. If there is a failure to update, then None will be returned. If the connector's connect_volume is decorated with os_brick.utils.connect_volume_prepare_result then the path will have been changed by the decorator if the volume was encrypted, so if this method uses the original path as a shortcut to know which device to extend (instead of using the other connection information) then it should use the os_brick.utils.connect_volume_undo_prepare_result decorator on this method so that it gets the original path instead of the modified symlink one. :param connection_properties: The volume connection properties. :returns: new size of the volume. """ pass @abc.abstractmethod def get_all_available_volumes(self, connection_properties=None): """Return all volumes that exist in the search directory. At connect_volume time, a Connector looks in a specific directory to discover a volume's paths showing up. This method's job is to return all paths in the directory that connect_volume uses to find a volume. This method is used in coordination with get_volume_paths() to verify that volumes have gone away after disconnect_volume has been called. :param connection_properties: The dictionary that describes all of the target volume attributes. :type connection_properties: dict """ pass def check_IO_handle_valid(self, handle, data_type, protocol): """Check IO handle has correct data type.""" if (handle and not isinstance(handle, data_type)): raise exception.InvalidIOHandleObject( protocol=protocol, actual_type=type(handle))