The watcherclient.common.apiclient.base Module

Base utilities to build API operation managers and objects on top of.

class watcherclient.common.apiclient.base.BaseManager(client)

Bases: watcherclient.common.apiclient.base.HookableMixin

Basic manager type providing common operations.

Managers interact with a particular type of API (servers, flavors, images, etc.) and provide CRUD operations for them.

resource_class = None

class watcherclient.common.apiclient.base.CrudManager(client)

Bases: watcherclient.common.apiclient.base.BaseManager

Base manager class for manipulating entities.

Children of this class are expected to define a collection_key and key.

• collection_key: Usually a plural noun by convention (e.g. entities); used to refer collections in both URL’s (e.g. /v3/entities) and JSON objects containing a list of member resources (e.g. {‘entities’: [{}, {}, {}]}).

• key: Usually a singular noun by convention (e.g. entity); used to refer to an individual member of the collection.

build_url(base_url=None, **kwargs)

Builds a resource URL for the given kwargs.

Given an example collection where collection_key = ‘entities’ and key = ‘entity’, the following URL’s could be generated.

By default, the URL will represent a collection of entities, e.g.:

/entities

If kwargs contains an entity_id, then the URL will represent a specific member, e.g.:

/entities/{entity_id}

Parameters

base_url – if provided, the generated URL will be appended to it

collection_key = None

create(**kwargs)

delete(**kwargs)

find(base_url=None, **kwargs)

Find a single item with attributes matching **kwargs.

Parameters

base_url – if provided, the generated URL will be appended to it

get(**kwargs)

head(**kwargs)

key = None

list(base_url=None, **kwargs)

List the collection.

Parameters

base_url – if provided, the generated URL will be appended to it

put(base_url=None, **kwargs)

Update an element.

Parameters

base_url – if provided, the generated URL will be appended to it

update(**kwargs)

class watcherclient.common.apiclient.base.Extension(name, module)

Bases: watcherclient.common.apiclient.base.HookableMixin

Extension descriptor.

SUPPORTED_HOOKS = ('__pre_parse_args__', '__post_parse_args__')

manager_class = None

class watcherclient.common.apiclient.base.HookableMixin

Bases: object

Mixin so classes can register and run hooks.

classmethod add_hook(hook_type, hook_func)

Add a new hook of specified type.

Parameters

• cls – class that registers hooks

• hook_type – hook type, e.g., ‘__pre_parse_args__’

• hook_func – hook function

classmethod run_hooks(hook_type, *args, **kwargs)

Run all hooks of specified type.

Parameters

• cls – class that registers hooks

• hook_type – hook type, e.g., ‘__pre_parse_args__’

• args – args to be passed to every hook function

• kwargs – kwargs to be passed to every hook function

class watcherclient.common.apiclient.base.ManagerWithFind(client)

Bases: watcherclient.common.apiclient.base.BaseManager

Manager with additional find()/findall() methods.

find(**kwargs)

Find a single item with attributes matching **kwargs.

This isn’t very efficient: it loads the entire list then filters on the Python side.

findall(**kwargs)

Find all items with attributes matching **kwargs.

This isn’t very efficient: it loads the entire list then filters on the Python side.

abstract list()

class watcherclient.common.apiclient.base.Resource(manager, info, loaded=False)

Bases: object

Base class for OpenStack resources (tenant, user, etc.).

This is pretty much just a bag for attributes.

HUMAN_ID = False

NAME_ATTR = 'name'

get()

Support for lazy loading details.

Some clients, such as watcherclient have the option to lazy load the details, details which can be loaded with this function.

property human_id

Human-readable ID which can be used for bash completion.

is_loaded()

set_loaded(val)

to_dict()

watcherclient.common.apiclient.base.getid(obj)

Return id if argument is a Resource.

Abstracts the common pattern of allowing both an object or an object’s ID (UUID) as a parameter when dealing with relationships.