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API Attributes
==============
Neutron's resource attributes are defined in dictionaries
in ``api/definitions``.
The map containing all installed resources (for core and active extensions)
is in ``api/attributes.py``.
Attribute map structure
-----------------------
Example attribute definitions for ``dns_name``:
.. code-block:: python
'dns_name': {
'allow_post': True,
'allow_put': True,
'default': '',
'convert_to': convert_to_lowercase,
'validate': {'type:dns_name': FQDN_MAX_LEN},
'is_visible': True
},
The ``validate`` item specifies rules for `validating <api_validators.html>`_
the attribute.
The ``convert_to`` item specifies rules for `converting <api_converters.html>`_
the attribute.
Example attribute definitions for ``gateway_ip``:
.. code-block:: python
'gateway_ip': {
'allow_post': True,
'allow_put': True,
'default': constants.ATTR_NOT_SPECIFIED,
'validate': {'type:ip_address_or_none': None},
'is_visible': True
}
Note: a default of ``ATTR_NOT_SPECIFIED`` indicates that an attribute is not
required, but will be generated by the plugin if it is not specified.
Particularly, a value of ``ATTR_NOT_SPECIFIED`` is different from an
attribute that has been specified with a value of ``None``. For example,
if ``gateway_ip`` is omitted in a request to create a subnet, the plugin
will receive ``ATTR_NOT_SPECIFIED`` and the default gateway IP will be
generated. However, if ``gateway_ip`` is specified as ``None``, this means
that the subnet does not have a gateway IP.
The following are the defined keys for attribute maps:
====================== ======
``default`` default value of the attribute (if missing, the attribute becomes mandatory)
``allow_post`` the attribute can be used on ``POST`` requests
``allow_put`` the attribute can be used on ``PUT`` requests
``validate`` specifies rules for validating data in the attribute
``convert_to`` transformation to apply to the value before it is returned
``convert_list_to`` if the value is a list, apply this transformation to the value before it is returned
``is_visible`` the attribute is returned in ``GET`` responses
``required_by_policy`` the attribute is required by the policy engine and should therefore be filled by the API layer even if not present in request body
``enforce_policy`` the attribute is actively part of the policy enforcing mechanism, ie: there might be rules which refer to this attribute
``primary_key`` Mark the attribute as a unique key.
====================== ======
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