Exemplo n.º 1
0
    def __init__(self, index, settings, frame, start, call):
        """Create new configuration Handler.

        :param index: The UI tab index.
        :param frame: The shared plug-in UI frame.
        :type frame: :class:`.AzureBatchUI`
        :param func call: The shared REST API call wrapper.
        """
        self.session = start
        self._tab_index = index
        self._data_dir = os.path.join(maya.prefs_dir(), 'AzureBatchData')
        self._ini_file = "azure_batch.ini"
        self._user_agent = "batchmaya/{}".format(
            os.environ.get('AZUREBATCH_VERSION'))
        self._cfg = ConfigParser.ConfigParser()
        self._call = call
        self.aad_environment_provider = AADEnvironmentProvider()

        self._log = self._configure_logging(
            LOG_LEVELS['debug']
        )  #config hasn't been loaded yet so use a default logging level

        self.ui = ConfigUI(self, settings, frame)
        self._configure_plugin(False)
        self.aad_environment = None
Exemplo n.º 2
0
    def initialize_ui(self, index, settings, frame, start, call):
        """Create new configuration Handler.

        :param index: The UI tab index.
        :param frame: The shared plug-in UI frame.
        :type frame: :class:`.AzureBatchUI`
        :param func call: The shared REST API call wrapper.
        """
        self.session = start
        self._tab_index = index

        self._ini_file = "azure_batch.ini"
        self._user_agent = "batchmaya/{}".format(
            os.environ.get('AZUREBATCH_VERSION'))
        self._cfg = ConfigParser.ConfigParser()
        self._call = call
        self.aad_environment_provider = AADEnvironmentProvider()

        self.ui = ConfigUI(self, settings, frame)
        self._configure_plugin(False)
        self.aad_environment = None
Exemplo n.º 3
0
    def __init__(self, index, frame, start):
        """Create new configuration Handler.

        :param index: The UI tab index.
        :param frame: The shared plug-in UI frame.
        :type frame: :class:`.AzureBatchUI`
        :param func call: The shared REST API call wrapper.
        """
        self.ui = None
        self.session = start
        self._tab_index = index
        self._data_dir = os.path.join(maya.prefs_dir(), 'AzureBatchData')
        self._ini_file = "azure_batch.ini"
        self._user_agent = "batchmaya/{}".format(
            os.environ.get('AZUREBATCH_VERSION'))
        self._cfg = ConfigParser.ConfigParser()
        self._client = None
        self._log = None
        self._storage = None
        self._configure_plugin()
        self.ui = ConfigUI(self, frame)
        self._auth = self._auto_authentication()
        self._update_config_ui()
Exemplo n.º 4
0
class AzureBatchConfig(object):
    """Handler for authentication and configuration of the SDK clients."""

    aadClientId = "04b07795-8ddb-461a-bbee-02f9e1bf7b46"  #Azure CLI

    def __init__(self, index, settings, frame, start, call):
        """Create new configuration Handler.

        :param index: The UI tab index.
        :param frame: The shared plug-in UI frame.
        :type frame: :class:`.AzureBatchUI`
        :param func call: The shared REST API call wrapper.
        """
        self.session = start
        self._tab_index = index
        self._data_dir = os.path.join(maya.prefs_dir(), 'AzureBatchData')
        self._ini_file = "azure_batch.ini"
        self._user_agent = "batchmaya/{}".format(
            os.environ.get('AZUREBATCH_VERSION'))
        self._cfg = ConfigParser.ConfigParser()
        self._call = call
        self.aad_environment_provider = AADEnvironmentProvider()

        self._log = self._configure_logging(
            LOG_LEVELS['debug']
        )  #config hasn't been loaded yet so use a default logging level

        self.ui = ConfigUI(self, settings, frame)
        self._configure_plugin(False)
        self.aad_environment = None

        #TODO as part of init should check batch and storage clients work somehow
        #old method with dummy listPool etc calls slowed down opening,
        #so maybe do this in background after UI has been fully loaded

    def __getattr__(self, attr):
        #return None rather than throw AttributeError so we don't have to init everything
        return self.__dict__.get(attr, None)

    #property helpers
    def _get_cached_config_value(self, identifier):
        try:
            return self._cfg.get('AzureBatch', identifier)
        except ConfigParser.NoOptionError:
            return None

    def _store_config_value(self, identifier, value):
        self._cfg.set('AzureBatch', identifier, str(value))
        self._save_config()

    #properties from config file
    @property
    def mgmt_auth_token(self):
        value_from_config = self._get_cached_config_value('mgmt_auth_token')
        if value_from_config is None:
            return None
        json_loaded_value = json.loads(value_from_config)
        return self.convert_utc_expireson_to_local_timezone_naive(
            json_loaded_value)

    @mgmt_auth_token.setter
    def mgmt_auth_token(self, value):
        self._store_config_value(
            'mgmt_auth_token',
            json.dumps(self.convert_timezone_naive_expireson_to_utc(value)))

    @property
    def batch_auth_token(self):
        value_from_config = self._get_cached_config_value('batch_auth_token')
        if value_from_config is None:
            return None
        json_loaded_value = json.loads(value_from_config)
        return self.convert_utc_expireson_to_local_timezone_naive(
            json_loaded_value)

    @batch_auth_token.setter
    def batch_auth_token(self, value):
        self._store_config_value(
            'batch_auth_token',
            json.dumps(self.convert_timezone_naive_expireson_to_utc(value)))

    @property
    def subscription_id(self):
        return self._get_cached_config_value('subscription_id')

    @subscription_id.setter
    def subscription_id(self, value):
        self._store_config_value('subscription_id', value)

    @property
    def subscription_name(self):
        return self._get_cached_config_value('subscription_name')

    @subscription_name.setter
    def subscription_name(self, value):
        self._store_config_value('subscription_name', value)

    @property
    def vm_sku(self):
        value_in_config = self._get_cached_config_value('vm_sku')
        if value_in_config is None:
            return self.default_vm_sku()
        return value_in_config

    @vm_sku.setter
    def vm_sku(self, value):
        self._store_config_value('vm_sku', value)

    @property
    def batch_account(self):
        return self._get_cached_config_value('batch_account')

    @batch_account.setter
    def batch_account(self, value):
        self._store_config_value('batch_account', value)

    @property
    def batch_url(self):
        return self._get_cached_config_value('batch_url')

    @batch_url.setter
    def batch_url(self, value):
        self._store_config_value('batch_url', value)

    @property
    def storage_account_resource_id(self):
        return self._get_cached_config_value('storage_account_resource_id')

    @storage_account_resource_id.setter
    def storage_account_resource_id(self, value):
        self._store_config_value('storage_account_resource_id', value)

    @property
    def custom_image_resource_id(self):
        return self._get_cached_config_value('custom_image_resource_id')

    @custom_image_resource_id.setter
    def custom_image_resource_id(self, value):
        self._store_config_value('custom_image_resource_id', value)

    @property
    def container_image(self):
        return self._get_cached_config_value('container_image')

    @container_image.setter
    def container_image(self, value):
        self._store_config_value('container_image', value)

    @property
    def node_sku_id(self):
        return self._get_cached_config_value('node_sku_id')

    @node_sku_id.setter
    def node_sku_id(self, value):
        self._store_config_value('node_sku_id', value)

    @property
    def batch_image(self):
        return self._get_cached_config_value('batch_image')

    @batch_image.setter
    def batch_image(self, value):
        self._store_config_value('batch_image', value)

    @property
    def aad_tenant_name(self):
        return self._get_cached_config_value('aad_tenant_name')

    @aad_tenant_name.setter
    def aad_tenant_name(self, value):
        self._store_config_value('aad_tenant_name', value)

    @property
    def aad_environment_id(self):
        value = self._get_cached_config_value('aad_environment_id')
        return value

    @aad_environment_id.setter
    def aad_environment_id(self, value):
        self._store_config_value('aad_environment_id', value)

    #properties from config file with additional behaviour
    @property
    def logging_level(self):
        value_in_config = self._get_cached_config_value('logging')
        if value_in_config is None:
            return self.default_logging()
        return value_in_config

    @logging_level.setter
    def logging_level(self, value):
        self._log.setLevel(level)
        self._store_config_value('logging', value)

    @property
    def threads(self):
        value_in_config = self._get_cached_config_value('threads')
        if value_in_config is None:
            return self.default_threads()
        return int(value_in_config)

    @threads.setter
    def threads(self, value):
        if self._client != None:
            self._client.threads = self.threads
        self._store_config_value('threads', value)

    #non config file properties
    @property
    def batch(self):
        return self._client

    @property
    def subscription_client(self):
        return self._subscription_client

    @subscription_client.setter
    def subscription_client(self, value):
        self._subscription_client = value

    @property
    def batch_mgmt_client(self):
        try:
            return self._batch_mgmt_client
        except AttributeError:
            self._batch_mgmt_client = None
            return self._batch_mgmt_client

    @batch_mgmt_client.setter
    def batch_mgmt_client(self, value):
        self._batch_mgmt_client = value

    @property
    def storage(self):
        return self._storage

    @property
    def path(self):
        return os.path.join(self._data_dir, self._ini_file)

    @property
    def auth(self):
        return self._auth

    @auth.setter
    def auth(self, value):
        self._auth = value

    def _configure_plugin(self, from_auth_button):
        """Set up the config file, authenticate the SDK clients
        and set up the log file.
        """
        if not os.path.exists(self._data_dir):
            os.makedirs(self._data_dir)
        config_file = os.path.join(self._data_dir, self._ini_file)

        try:
            self._cfg.read(config_file)

            self.ui.disable(True)

            self._read_config_file()

        except Exception as exp:
            # We should only worry about this if it happens when authenticating
            # using the UI, otherwise it's expected.
            if from_auth_button:
                raise ValueError("Invalid Configuration: {}".format(exp))

        self.ui.init_post_config_file_read()

        if (not self.batch_auth_token or not self.mgmt_auth_token):
            self.ui.prompt_for_aad_tenant()
            if self.aad_tenant_name and self.aad_tenant_name != None and self.aad_tenant_name != 'None':
                maya.text_field(self.ui._aad_tenant_field,
                                edit=True,
                                text=self.aad_tenant_name)
                self.ui.aad_tenant_name_changed(self.aad_tenant_name)
                maya.refresh()
        else:
            if self.need_to_refresh_auth_tokens(
                [self.batch_auth_token, self.mgmt_auth_token]):
                refreshedTokens = self.refresh_auth_tokens(
                    self.batch_auth_token, self.mgmt_auth_token)
                if not refreshedTokens:
                    self.prompt_for_and_obtain_aad_tokens()
                    return
            self._configure_post_auth()

    def _configure_post_auth(self):
        self.mgmtCredentials = AADTokenCredentials(
            self.mgmt_auth_token,
            cloud_environment=self.aad_environment_provider.
            getEnvironmentForId(self.aad_environment_id),
            tenant=self.aad_tenant_name)
        self.batchCredentials = AADTokenCredentials(
            self.batch_auth_token,
            cloud_environment=self.aad_environment_provider.
            getEnvironmentForId(self.aad_environment_id),
            tenant=self.aad_tenant_name)

        if self.can_init_from_config:
            self.init_from_config()
            self.ui.init_from_config()

        else:
            self.subscription_client = SubscriptionClient(
                self.mgmtCredentials,
                base_url=self.aad_environment_provider.getResourceManager(
                    self.aad_environment_id))
            self.ui.init_post_auth()

    def update_batch_and_storage_client_creds(self, batch_auth_token,
                                              mgmt_auth_token):

        self.batchCredentials = AADTokenCredentials(
            batch_auth_token,
            cloud_environment=self.aad_environment_provider.
            getEnvironmentForId(self.aad_environment_id),
            tenant=self.aad_tenant_name)
        self.mgmtCredentials = AADTokenCredentials(
            mgmt_auth_token,
            cloud_environment=self.aad_environment_provider.
            getEnvironmentForId(self.aad_environment_id),
            tenant=self.aad_tenant_name)
        self._client._mgmt_credentials = self.mgmtCredentials
        self._client._client.creds = self.batchCredentials

        self.storage_mgmt_client._client.creds = self.mgmtCredentials

    def need_to_refresh_auth_tokens(self, auth_token_list):

        currentTime = datetime.datetime.now()

        tokenRefreshThresholdSeconds = 5 * 60

        for token in auth_token_list:
            if (dateparse(token['expiresOn']) - currentTime
                ).total_seconds() < tokenRefreshThresholdSeconds:
                return True
        return False

    def refresh_auth_tokens(self, batch_token, mgmt_token):

        context = adal.AuthenticationContext(
            self.aad_environment_provider.getAadAuthorityHostUrl(
                self.aad_environment_id) + '/' + self.aad_tenant_name,
            api_version=None)

        try:
            self.mgmt_auth_token = context.acquire_token_with_refresh_token(
                mgmt_token['refreshToken'], self.aadClientId,
                self.aad_environment_provider.getAadManagementUrl(
                    self.aad_environment_id))

            self.batch_auth_token = context.acquire_token_with_refresh_token(
                batch_token['refreshToken'], self.aadClientId,
                self.aad_environment_provider.getBatchResourceUrl(
                    self.aad_environment_id))

            return True

        except AdalError as exp:
            errors = exp.error_response['error_codes']
            if 70002 in errors or 70008 in errors:
                #70002 is: Error validating credentials. 70008 is: The refresh token has expired due to inactivity.
                return False
            raise exp

    def prompt_for_and_obtain_aad_tokens(self):
        self.obtain_aad_tokens()
        self.ui.auth_status = "Please follow instructions below to sign in."
        maya.refresh()

    def obtain_aad_tokens(self):
        ui_environment_id = self.ui.aad_environment_dropdown.value()
        ui_tenant_name = self.ui.aadTenant
        context = adal.AuthenticationContext(
            self.aad_environment_provider.getAadAuthorityHostUrl(
                ui_environment_id) + '/' + ui_tenant_name,
            api_version=None)

        code = context.acquire_user_code(
            self.aad_environment_provider.getAadManagementUrl(
                ui_environment_id), self.aadClientId)
        self._log.info(code['message'])

        self.ui.prompt_for_login(code['message'])

        def aad_auth_thread_func(context, code):
            self.mgmt_auth_token = context.acquire_token_with_device_code(
                self.aad_environment_provider.getAadManagementUrl(
                    ui_environment_id), code, self.aadClientId)
            self.batch_auth_token = context.acquire_token(
                self.aad_environment_provider.getBatchResourceUrl(
                    ui_environment_id), self.mgmt_auth_token['userId'],
                self.aadClientId)
            self.aad_environment_id = ui_environment_id
            self.aad_tenant_name = ui_tenant_name
            self.remove_old_batch_account_from_config()
            maya.execute_in_main_thread(self._configure_post_auth)

        authThread = threading.Thread(target=aad_auth_thread_func,
                                      args=(context, code))

        authThread.start()

    def remove_old_batch_account_from_config(self):
        self._cfg.remove_option('AzureBatch', 'batch_url')
        self._cfg.remove_option('AzureBatch', 'batch_account')
        self._cfg.remove_option('AzureBatch', 'subscription_id')
        self._cfg.remove_option('AzureBatch', 'subscription_name')
        self._cfg.remove_option('AzureBatch', 'storage_account_resource_id')
        self._save_config()

    def _configure_logging(self, log_level):
        """Configure the logger. Setup the file output and format
        the log messages.

        :param log_level: The specified level of logging verbosity.
        """
        level = int(log_level)
        logger = logging.getLogger('AzureBatchMaya')
        file_format = logging.Formatter(
            "%(asctime)-15s [%(levelname)s] %(module)s: %(message)s")
        logfile = os.path.join(self._data_dir, "azure_batch.log")
        if not os.path.exists(logfile):
            with open(logfile, 'w') as handle:
                handle.write("Azure Batch Plugin Log")
        file_logging = logging.FileHandler(logfile)
        file_logging.setFormatter(file_format)
        logger.addHandler(file_logging)
        logger.setLevel(level)
        return logger

    def _read_config_file(self):
        """Populate the config tab UI with the values loaded from the
        configuration file.
        """
        self.ensure_azurebatch_config_section_exists()

        #set to true optimistically here, if any values are missing then this must be an old config format
        self.can_init_from_config = True

        required_config_values = [
            self.subscription_id, self.aad_tenant_name, self.subscription_name,
            self.aad_environment_id, self.batch_url, self.batch_account,
            self.storage_account_resource_id, self.mgmt_auth_token,
            self.batch_auth_token
        ]

        #if a required value is not present in the config, the relevant property will return 'None'
        if None in required_config_values:
            self.can_init_from_config = False

        self._log = self._configure_logging(self.logging_level)

        if self._client != None:
            self._client.threads = self.threads

    def _save_config(self):
        """Persist the current plugin configuration to file."""
        config_file = os.path.join(self._data_dir, self._ini_file)
        with open(config_file, 'w') as handle:
            self._cfg.write(handle)

    def save_changes(self):
        """Persist auth config changes to file for future sessions."""
        self.ensure_azurebatch_config_section_exists()
        #TODO is this method necessary anymore?
        self._cfg.set('AzureBatch', 'batch_url', self.batch_url)
        self._cfg.set('AzureBatch', 'batch_account', self.batch_account)
        self._cfg.set('AzureBatch', 'subscription_id', self.subscription_id)
        self._cfg.set('AzureBatch', 'subscription_name',
                      self.subscription_name)
        self._cfg.set('AzureBatch', 'storage_account_resource_id',
                      self.storage_account_resource_id)
        self._cfg.set('AzureBatch', 'logging', str(self.logging_level))
        self._cfg.set('AzureBatch', 'aad_tenant_name', self.aad_tenant_name)
        self._cfg.set('AzureBatch', 'aad_environment_id',
                      self.aad_environment_id)
        self._save_config()

    def ensure_azurebatch_config_section_exists(self):
        try:
            self._cfg.add_section('AzureBatch')
        except ConfigParser.DuplicateSectionError:
            pass

    def available_subscriptions(self):
        """Retrieve the currently available subscriptions to populate
        the subscription selection drop down.
        """
        if not self.subscription_client:
            self.subscription_client = SubscriptionClient(
                self.mgmtCredentials,
                base_url=self.aad_environment_provider.getResourceManager(
                    self.aad_environment_id))
        all_subscriptions = self._call(
            self.subscription_client.subscriptions.list)
        self.subscriptions = []
        for subscription in all_subscriptions:
            self.subscriptions.append(subscription)
        self.count = len(self.subscriptions)
        return self.subscriptions

    def init_after_subscription_selected(self, subscription_id,
                                         subscription_name):
        self.subscription_id = subscription_id
        self.subscription_name = subscription_name
        self.batch_mgmt_client = BatchManagementClient(
            self.mgmtCredentials,
            str(subscription_id),
            base_url=self.aad_environment_provider.getResourceManager(
                self.aad_environment_id))

    def init_after_batch_account_selected(self, batchaccount, subscription_id):
        self.batch_account = batchaccount.name
        self.batch_url = "https://" + batchaccount.account_endpoint

        storageAccountId = batchaccount.auto_storage.storage_account_id
        self.storage_account_resource_id = storageAccountId

        parsedStorageAccountId = msrestazuretools.parse_resource_id(
            storageAccountId)
        self.storage_account = parsedStorageAccountId['name']

        self.storage_mgmt_client = StorageManagementClient(
            self.mgmtCredentials,
            str(subscription_id),
            base_url=self.aad_environment_provider.getResourceManager(
                self.aad_environment_id))

        try:
            self.storage_key = self._call(
                self.storage_mgmt_client.storage_accounts.list_keys,
                parsedStorageAccountId['resource_group'],
                self.storage_account).keys[0].value
        except Exception as exp:
            self.remove_old_batch_account_from_config()
            raise exp

        self._storage = storage.BlockBlobService(self.storage_account,
                                                 self.storage_key)
        self._storage.MAX_SINGLE_PUT_SIZE = 2 * 1024 * 1024

        #TODO refactor move the below shared block into def configureClient(client)
        self._client = batch.BatchExtensionsClient(
            self.batchCredentials,
            base_url=self.batch_url,
            storage_client=self._storage)

        self._client.config.add_user_agent(self._user_agent)
        self._client.threads = self.threads
        self._log = self._configure_logging(self.logging_level)

    def init_from_config(self):
        parsedStorageAccountId = msrestazuretools.parse_resource_id(
            self.storage_account_resource_id)
        self.storage_account = parsedStorageAccountId['name']

        self.storage_mgmt_client = StorageManagementClient(
            self.mgmtCredentials,
            str(self.subscription_id),
            base_url=self.aad_environment_provider.getResourceManager(
                self.aad_environment_id))

        self.storage_key = self._call(
            self.storage_mgmt_client.storage_accounts.list_keys,
            parsedStorageAccountId['resource_group'],
            self.storage_account).keys[0].value

        self._storage = storage.BlockBlobService(self.storage_account,
                                                 self.storage_key)
        self._storage.MAX_SINGLE_PUT_SIZE = 2 * 1024 * 1024

        #TODO refactor move the below shared block into def configureClient(client)
        self._client = batch.BatchExtensionsClient(
            self.batchCredentials,
            base_url=self.batch_url,
            storage_client=self._storage)

        self._client.config.add_user_agent(self._user_agent)
        self._client.threads = self.threads
        self.save_changes()
        self._log = self._configure_logging(self.logging_level)

    def available_batch_accounts(self):
        """Retrieve the currently available batch accounts to populate
        the account selection drop down.
        """
        if not self.batch_mgmt_client:
            self.batch_mgmt_client = BatchManagementClient(
                self.mgmtCredentials,
                str(self.subscription_id),
                base_url=self.aad_environment_provider.getResourceManager(
                    self.aad_environment_id))
        batch_accounts = self._call(self.batch_mgmt_client.batch_account.list)
        accounts = []
        for account in batch_accounts:
            if account.auto_storage != None:
                accounts.append(account)
        self.count = len(accounts)
        self._available_batch_accounts = accounts

        return self._available_batch_accounts

    def default_logging(self):
        return 10

    def default_threads(self):
        return 20

    def default_vm_sku(self):
        return "STANDARD_A1"

    def convert_timezone_naive_expireson_to_utc(self, token):
        # we want to store token expiry times as UTC for consistency
        if token and token is not None and 'expiresOn' in token:
            token_copy = copy.deepcopy(token)
            expireson_local = dateparse(
                token_copy['expiresOn']).replace(tzinfo=dateutil.tz.tzlocal())
            expireson_utc = expireson_local.astimezone(
                dateutil.tz.gettz('UTC'))
            token_copy['expiresOnUTC'] = str(expireson_utc)
            del token_copy['expiresOn']
            return token_copy
        else:
            return token

    def convert_utc_expireson_to_local_timezone_naive(self, token):
        #the standard token expireson format which the various AAD libraries expect / return is a vanilla datetime string, in local time and timezone naive (no tz specified)
        if token and token is not None and 'expiresOnUTC' in token:
            token_copy = copy.deepcopy(token)
            localtz = dateutil.tz.tzlocal()
            expireson_utc = dateparse(token_copy['expiresOnUTC']).replace(
                tzinfo=dateutil.tz.gettz('UTC'))
            expireson_local = expireson_utc.astimezone(dateutil.tz.tzlocal())
            expireson_local_tz_naive = expireson_local.replace(tzinfo=None)
            token_copy['expiresOn'] = str(expireson_local_tz_naive)
            del token_copy['expiresOnUTC']
            return token_copy
        else:
            return token
Exemplo n.º 5
0
class AzureBatchConfig(object):
    """Handler for authentication and configuration of the SDK clients."""
    def __init__(self, index, frame, start):
        """Create new configuration Handler.

        :param index: The UI tab index.
        :param frame: The shared plug-in UI frame.
        :type frame: :class:`.AzureBatchUI`
        :param func call: The shared REST API call wrapper.
        """
        self.ui = None
        self.session = start
        self._tab_index = index
        self._data_dir = os.path.join(maya.prefs_dir(), 'AzureBatchData')
        self._ini_file = "azure_batch.ini"
        self._user_agent = "batchmaya/{}".format(
            os.environ.get('AZUREBATCH_VERSION'))
        self._cfg = ConfigParser.ConfigParser()
        self._client = None
        self._log = None
        self._storage = None
        self._configure_plugin()
        self.ui = ConfigUI(self, frame)
        self._auth = self._auto_authentication()
        self._update_config_ui()

    @property
    def batch(self):
        return self._client

    @property
    def storage(self):
        return self._storage

    @property
    def auth(self):
        return self._auth

    @property
    def path(self):
        return os.path.join(self._data_dir, self._ini_file)

    def _configure_plugin(self):
        """Set up the the config file, authenticate the SDK clients
        and set up the log file.
        """
        if not os.path.exists(self._data_dir):
            os.makedirs(self._data_dir)
        config_file = os.path.join(self._data_dir, self._ini_file)
        try:
            self._cfg.read(config_file)
            self._storage = storage.BlockBlobService(
                self._cfg.get('AzureBatch', 'storage_account'),
                self._cfg.get('AzureBatch', 'storage_key'),
                endpoint_suffix=self._cfg.get('AzureBatch', 'storage_suffix'))
            self._storage.MAX_SINGLE_PUT_SIZE = 2 * 1024 * 1024
            credentials = SharedKeyCredentials(
                self._cfg.get('AzureBatch', 'batch_account'),
                self._cfg.get('AzureBatch', 'batch_key'))
            self._client = batch.BatchExtensionsClient(
                credentials,
                base_url=self._cfg.get('AzureBatch', 'batch_url'),
                storage_client=self._storage)
            self._client.threads = self._cfg.getint('AzureBatch', 'threads')
            self._client.config.add_user_agent(self._user_agent)
            self._log = self._configure_logging(
                self._cfg.get('AzureBatch', 'logging'))
        except Exception as exp:
            # We should only worry about this if it happens when authenticating
            # using the UI, otherwise it's expected.
            if self.ui:
                raise ValueError("Invalid Configuration: {}".format(exp))
            else:
                # We'll need a place holder logger
                self._log = self._configure_logging(LOG_LEVELS['debug'])

    def _configure_logging(self, log_level):
        """Configure the logger. Setup the file output and format
        the log messages.

        :param log_level: The specified level of logging verbosity.
        """
        level = int(log_level)
        logger = logging.getLogger('AzureBatchMaya')
        file_format = logging.Formatter(
            "%(asctime)-15s [%(levelname)s] %(module)s: %(message)s")
        logfile = os.path.join(self._data_dir, "azure_batch.log")
        if not os.path.exists(logfile):
            with open(logfile, 'w') as handle:
                handle.write("Azure Batch Plugin Log")
        file_logging = logging.FileHandler(logfile)
        file_logging.setFormatter(file_format)
        logger.addHandler(file_logging)
        logger.setLevel(level)
        return logger

    def _update_config_ui(self):
        """Populate the config tab UI with the values loaded from the
        configuration file.
        """
        try:
            self._cfg.add_section('AzureBatch')
        except ConfigParser.DuplicateSectionError:
            pass
        try:
            self.ui.endpoint = self._cfg.get('AzureBatch', 'batch_url')
        except ConfigParser.NoOptionError:
            self.ui.endpoint = ""
        try:
            self.ui.account = self._cfg.get('AzureBatch', 'batch_account')
        except ConfigParser.NoOptionError:
            self.ui.account = ""
        try:
            self.ui.key = self._cfg.get('AzureBatch', 'batch_key')
        except ConfigParser.NoOptionError:
            self.ui.key = ""
        try:
            self.ui.storage = self._cfg.get('AzureBatch', 'storage_account')
        except ConfigParser.NoOptionError:
            self.ui.storage = ""
        try:
            self.ui.storage_key = self._cfg.get('AzureBatch', 'storage_key')
        except ConfigParser.NoOptionError:
            self.ui.storage_key = ""
        try:
            self.ui.storage_suffix = self._cfg.get('AzureBatch',
                                                   'storage_suffix')
        except ConfigParser.NoOptionError:
            self.ui.storage_suffix = "core.windows.net"
        try:
            self.ui.logging = self._cfg.getint('AzureBatch', 'logging')
        except ConfigParser.NoOptionError:
            self.ui.logging = 10
            self._cfg.set('AzureBatch', 'logging', LOG_LEVELS['debug'])
        try:
            self.ui.threads = self._cfg.getint('AzureBatch', 'threads')
        except ConfigParser.NoOptionError:
            self.ui.threads = 20
            self._cfg.set('AzureBatch', 'threads', 20)
        finally:
            if self._client != None:
                self._client.threads = self.ui.threads
        self.ui.set_authenticate(self._auth)

    def _auto_authentication(self):
        """Test whether the clients are correctly authenticated
        by doing some quick API calls.
        """
        try:
            filter = batch.models.PoolListOptions(max_results=1, select="id")
            list(self._client.pool.list(filter))
            self._storage.list_containers(num_results=1)
            return True
        except Exception as exp:
            self._log.info("Failed to authenticate: {0}".format(exp))
            return False

    def _save_config(self):
        """Persist the current plugin configuration to file."""
        config_file = os.path.join(self._data_dir, self._ini_file)
        with open(config_file, 'w') as handle:
            self._cfg.write(handle)

    def set_logging(self, level):
        """Set the logging level to that specified in the UI.
        :param str level: The specified logging level.
        """
        self._log.setLevel(level)
        self._cfg.set('AzureBatch', 'logging', level)
        self._save_config()

    def set_threads(self, threads):
        """Set the number of threads to that specified in the UI.
        :param int threads: The specified number of threads.
        """
        self._cfg.set('AzureBatch', 'threads', threads)
        self._client.threads = threads
        self._save_config()

    def save_changes(self):
        """Persist auth config changes to file for future sessions."""
        try:
            self._cfg.add_section('AzureBatch')
        except ConfigParser.DuplicateSectionError:
            pass
        self._cfg.set('AzureBatch', 'batch_url', self.ui.endpoint)
        self._cfg.set('AzureBatch', 'batch_account', self.ui.account)
        self._cfg.set('AzureBatch', 'batch_key', self.ui.key)
        self._cfg.set('AzureBatch', 'storage_account', self.ui.storage)
        self._cfg.set('AzureBatch', 'storage_key', self.ui.storage_key)
        self._cfg.set('AzureBatch', 'storage_suffix', self.ui.storage_suffix)
        self._save_config()

    def authenticate(self):
        """Begin authentication - initiated by the UI button."""
        try:
            self._configure_plugin()
            self._auth = self._auto_authentication()
        except ValueError as exp:
            maya.error(str(exp))
            self._auth = False
        finally:
            self.ui.set_authenticate(self._auth)
            self.session()

    def get_threads(self):
        """Attempt to retrieve number of threads configured for the plugin."""
        return self._client.threads

    def get_cached_vm_sku(self):
        """Attempt to retrieve a selected VM SKU from a previous session."""
        try:
            return self._cfg.get('AzureBatch', 'vm_sku')
        except ConfigParser.NoOptionError:
            return None

    def store_vm_sku(self, sku):
        """Cache selected VM SKU for later sessions."""
        self._cfg.set('AzureBatch', 'vm_sku', sku)
        self._save_config()

    def get_cached_image(self):
        """Attempt to retrieve a selected image a previous session."""
        try:
            return self._cfg.get('AzureBatch', 'image')
        except ConfigParser.NoOptionError:
            return None

    def store_image(self, image):
        """Cache selected image for later sessions."""
        self._cfg.set('AzureBatch', 'image', image)
        self._save_config()

    def get_cached_autoscale_formula(self):
        """Attempt to retrieve an autoscale forumla from a previous session."""
        try:
            return self._cfg.get('AzureBatch', 'autoscale')
        except ConfigParser.NoOptionError:
            return None

    def store_autoscale_formula(self, formula):
        """Cache selected VM SKU for later sessions."""
        self._cfg.set('AzureBatch', 'autoscale', formula)
        self._save_config()