The osc_lib.utils Module¶

Common client utilities

osc_lib.utils.backward_compat_col_lister(column_headers, columns, column_map)¶

Convert the column headers to keep column backward compatibility.

Replace the new column name of column headers by old name, so that the column headers can continue to support to show the old column name by –column/-c option with old name, like: volume list -c ‘Display Name’

Parameters:	column_headers – The column headers to be output in list command. columns – The columns to be output. column_map – The key of map is old column name, the value is new column name, like: {‘old_col’: ‘new_col’}

osc_lib.utils.backward_compat_col_showone(show_object, columns, column_map)¶

Convert the output object to keep column backward compatibility.

Replace the new column name of output object by old name, so that the object can continue to support to show the old column name by –column/-c option with old name, like: volume show -c ‘display_name’

Parameters:	show_object – The object to be output in create/show commands. columns – The columns to be output. column_map – The key of map is old column name, the value is new column name, like: {‘old_col’: ‘new_col’}

osc_lib.utils.build_kwargs_dict(arg_name, value)¶

Return a dictionary containing arg_name if value is set.

osc_lib.utils.env(*vars, **kwargs)¶

Search for the first defined of possibly many env vars

Returns the first environment variable defined in vars, or returns the default defined in kwargs.

osc_lib.utils.find_min_match(items, sort_attr, **kwargs)¶

Find all resources meeting the given minimum constraints

Parameters:	items – A List of objects to consider sort_attr – Attribute to sort the resulting list kwargs – A dict of attributes and their minimum values
Return type:	A list of resources osrted by sort_attr that meet the minimums

osc_lib.utils.find_resource(manager, name_or_id, **kwargs)¶

Helper for the _find_* methods.

Parameters:	manager – A client manager class name_or_id – The resource we are trying to find kwargs – To be used in calling .find()
Return type:	The found resource

This method will attempt to find a resource in a variety of ways. Primarily .get() methods will be called with name_or_id as an integer value, and tried again as a string value.

If both fail, then a .find() is attempted, which is essentially calling a .list() function with a ‘name’ query parameter that is set to name_or_id.

Lastly, if any kwargs are passed in, they will be treated as additional query parameters. This is particularly handy in the case of finding resources in a domain.

osc_lib.utils.format_dict(data)¶

Return a formatted string of key value pairs

Parameters:	data – a dict
Return type:	a string formatted to key=’value’

osc_lib.utils.format_dict_of_list(data, separator='; ')¶

Return a formatted string of key value pair

Parameters:	data – a dict, key is string, value is a list of string, for example: {u’public’: [u‘2001:db8::8’, u‘172.24.4.6’]} separator – the separator to use between key/value pair (default: ‘; ‘)
Returns:	a string formatted to {‘key1’=[‘value1’, ‘value2’]} with separated by separator

osc_lib.utils.format_list(data, separator=', ')¶

Return a formatted strings

Parameters:	data – a list of strings separator – the separator to use between strings (default: ‘, ‘)
Return type:	a string formatted based on separator

osc_lib.utils.format_list_of_dicts(data)¶

Return a formatted string of key value pairs for each dict

Parameters:	data – a list of dicts
Return type:	a string formatted to key=’value’ with dicts separated by new line

osc_lib.utils.format_size(size)¶

Display size of a resource in a human readable format

Parameters:	size (string) – The size of the resource in bytes.
Returns:	Returns the size in human-friendly format
Rtype string:

This function converts the size (provided in bytes) of a resource into a human-friendly format such as K, M, G, T, P, E, Z

osc_lib.utils.get_client_class(api_name, version, version_map)¶

Returns the client class for the requested API version

Parameters:	api_name – the name of the API, e.g. ‘compute’, ‘image’, etc version – the requested API version version_map – a dict of client classes keyed by version
Return type:	a client class for the requested API version

osc_lib.utils.get_dict_properties(item, fields, mixed_case_fields=None, formatters=None)¶

Return a tuple containing the item properties.

Parameters:	item – a single dict resource fields – tuple of strings with the desired field names mixed_case_fields – tuple of field names to preserve case formatters – dictionary mapping field names to callables to format the values

osc_lib.utils.get_effective_log_level()¶

Returns the lowest logging level considered by logging handlers

Retrieve and return the smallest log level set among the root logger’s handlers (in case of multiple handlers).

osc_lib.utils.get_field(item, field)¶

osc_lib.utils.get_item_properties(item, fields, mixed_case_fields=None, formatters=None)¶

Return a tuple containing the item properties.

Parameters:	item – a single item resource (e.g. Server, Project, etc) fields – tuple of strings with the desired field names mixed_case_fields – tuple of field names to preserve case formatters – dictionary mapping field names to callables to format the values

osc_lib.utils.get_password(stdin, prompt=None, confirm=True)¶

osc_lib.utils.is_ascii(string)¶

osc_lib.utils.read_blob_file_contents(blob_file)¶

osc_lib.utils.sort_items(items, sort_str)¶

Sort items based on sort keys and sort directions given by sort_str.

Parameters:	items – a list or generator object of items sort_str – a string defining the sort rules, the format is ‘<key1>:[direction1],<key2>:[direction2]…’, direction can be ‘asc’ for ascending or ‘desc’ for descending, if direction is not given, it’s ascending by default
Returns:	sorted items

osc_lib.utils.wait_for_delete(manager, res_id, status_field='status', error_status=['error'], exception_name=['NotFound'], sleep_time=5, timeout=300, callback=None)¶

Wait for resource deletion

Parameters:

manager – the manager from which we can get the resource res_id – the resource id to watch status_field – the status attribute in the returned resource object, this is used to check for error states while the resource is being deleted error_status – a list of status strings for error exception_name – a list of exception strings for deleted case sleep_time – wait this long between checks (seconds) timeout – check until this long (seconds) callback – called per sleep cycle, useful to display progress; this function is passed a progress value during each iteration of the wait loop

Return type:

True on success, False if the resource has gone to error state or the timeout has been reached

osc_lib.utils.wait_for_status(status_f, res_id, status_field='status', success_status=['active'], error_status=['error'], sleep_time=5, callback=None)¶

Wait for status change on a resource during a long-running operation

Parameters:	status_f – a status function that takes a single id argument res_id – the resource id to watch status_field – the status attribute in the returned resource object success_status – a list of status strings for successful completion error_status – a list of status strings for error sleep_time – wait this long (seconds) callback – called per sleep cycle, useful to display progress
Return type:	True on success