Neutron Plugin Architecture

Salvatore Orlando: How to write a Neutron Plugin (if you really need to)

Plugin API

v2 Neutron Plug-in API specification.

NeutronPluginBaseV2 provides the definition of minimum set of methods that needs to be implemented by a v2 Neutron Plug-in.

class neutron.neutron_plugin_base_v2.NeutronPluginBaseV2

create_network(context, network)

Create a network.

Create a network, which represents an L2 network segment which can have a set of subnets and ports associated with it.

Parameters:

• context – neutron api request context
• network – dictionary describing the network, with keys as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. All keys will be populated.

create_port(context, port)

Create a port.

Create a port, which is a connection point of a device (e.g., a VM NIC) to attach to a L2 neutron network.

Parameters:

• context – neutron api request context
• port – dictionary describing the port, with keys as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. All keys will be populated.

create_subnet(context, subnet)

Create a subnet.

Create a subnet, which represents a range of IP addresses that can be allocated to devices

Parameters:

• context – neutron api request context
• subnet – dictionary describing the subnet, with keys as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. All keys will be populated.

create_subnetpool(context, subnetpool)

Create a subnet pool.

Parameters:

• context – neutron api request context
• subnetpool – Dictionary representing the subnetpool to create.

delete_network(context, id)

Delete a network.

Parameters:

• context – neutron api request context
• id – UUID representing the network to delete.

delete_port(context, id)

Delete a port.

Parameters:

• context – neutron api request context
• id – UUID representing the port to delete.

delete_subnet(context, id)

Delete a subnet.

Parameters:

• context – neutron api request context
• id – UUID representing the subnet to delete.

delete_subnetpool(context, id)

Delete a subnet pool.

Parameters:

• context – neutron api request context
• id – The UUID of the subnet pool to delete.

get_network(context, id, fields=None)

Retrieve a network.

Parameters:

• context – neutron api request context
• id – UUID representing the network to fetch.
• fields – a list of strings that are valid keys in a network dictionary as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. Only these fields will be returned.

get_networks(context, filters=None, fields=None, sorts=None, limit=None, marker=None, page_reverse=False)

Retrieve a list of networks.

The contents of the list depends on the identity of the user making the request (as indicated by the context) as well as any filters.

Parameters:

• context – neutron api request context
• filters – a dictionary with keys that are valid keys for a network as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. Values in this dictiontary are an iterable containing values that will be used for an exact match comparison for that value. Each result returned by this function will have matched one of the values for each key in filters.
• fields – a list of strings that are valid keys in a network dictionary as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. Only these fields will be returned.

get_networks_count(context, filters=None)

Return the number of networks.

The result depends on the identity of the user making the request (as indicated by the context) as well as any filters.

Parameters:

• context – neutron api request context
• filters – a dictionary with keys that are valid keys for a network as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. Values in this dictiontary are an iterable containing values that will be used for an exact match comparison for that value. Each result returned by this function will have matched one of the values for each key in filters.

NOTE: this method is optional, as it was not part of the originally

defined plugin API.

get_port(context, id, fields=None)

Retrieve a port.

Parameters:

• context – neutron api request context
• id – UUID representing the port to fetch.
• fields – a list of strings that are valid keys in a port dictionary as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. Only these fields will be returned.

get_ports(context, filters=None, fields=None, sorts=None, limit=None, marker=None, page_reverse=False)

Retrieve a list of ports.

The contents of the list depends on the identity of the user making the request (as indicated by the context) as well as any filters.

Parameters:

• context – neutron api request context
• filters – a dictionary with keys that are valid keys for a port as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. Values in this dictiontary are an iterable containing values that will be used for an exact match comparison for that value. Each result returned by this function will have matched one of the values for each key in filters.
• fields – a list of strings that are valid keys in a port dictionary as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. Only these fields will be returned.

get_ports_count(context, filters=None)

Return the number of ports.

The result depends on the identity of the user making the request (as indicated by the context) as well as any filters.

Parameters:

• context – neutron api request context
• filters – a dictionary with keys that are valid keys for a network as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. Values in this dictiontary are an iterable containing values that will be used for an exact match comparison for that value. Each result returned by this function will have matched one of the values for each key in filters.

Note

this method is optional, as it was not part of the originally defined plugin API.

get_subnet(context, id, fields=None)

Retrieve a subnet.

Parameters:

• context – neutron api request context
• id – UUID representing the subnet to fetch.
• fields – a list of strings that are valid keys in a subnet dictionary as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. Only these fields will be returned.

get_subnetpool(context, id, fields=None)

Show a subnet pool.

Parameters:

• context – neutron api request context
• id – The UUID of the subnetpool to show.

get_subnetpools(context, filters=None, fields=None, sorts=None, limit=None, marker=None, page_reverse=False)

Retrieve list of subnet pools.

get_subnets(context, filters=None, fields=None, sorts=None, limit=None, marker=None, page_reverse=False)

Retrieve a list of subnets.

The contents of the list depends on the identity of the user making the request (as indicated by the context) as well as any filters.

Parameters:

• context – neutron api request context
• filters – a dictionary with keys that are valid keys for a subnet as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. Values in this dictiontary are an iterable containing values that will be used for an exact match comparison for that value. Each result returned by this function will have matched one of the values for each key in filters.
• fields – a list of strings that are valid keys in a subnet dictionary as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. Only these fields will be returned.

get_subnets_count(context, filters=None)

Return the number of subnets.

The result depends on the identity of the user making the request (as indicated by the context) as well as any filters.

Parameters:

• context – neutron api request context
• filters – a dictionary with keys that are valid keys for a network as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py. Values in this dictiontary are an iterable containing values that will be used for an exact match comparison for that value. Each result returned by this function will have matched one of the values for each key in filters.

Note

this method is optional, as it was not part of the originally defined plugin API.

get_workers()

Returns a collection NeutronWorker instances

If a plugin needs to define worker processes outside of API/RPC workers then it will override this and return a collection of NeutronWorker instances

rpc_workers_supported()

Return whether the plugin supports multiple RPC workers.

A plugin that supports multiple RPC workers should override the start_rpc_listeners method to ensure that this method returns True and that start_rpc_listeners is called at the appropriate time. Alternately, a plugin can override this method to customize detection of support for multiple rpc workers

Note

this method is optional, as it was not part of the originally defined plugin API.

start_rpc_listeners()

Start the RPC listeners.

Most plugins start RPC listeners implicitly on initialization. In order to support multiple process RPC, the plugin needs to expose control over when this is started.

Note

this method is optional, as it was not part of the originally defined plugin API.

update_network(context, id, network)

Update values of a network.

Parameters:

• context – neutron api request context
• id – UUID representing the network to update.
• network – dictionary with keys indicating fields to update. valid keys are those that have a value of True for ‘allow_put’ as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py.

update_port(context, id, port)

Update values of a port.

Parameters:

• context – neutron api request context
• id – UUID representing the port to update.
• port – dictionary with keys indicating fields to update. valid keys are those that have a value of True for ‘allow_put’ as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py.

update_subnet(context, id, subnet)

Update values of a subnet.

Parameters:

• context – neutron api request context
• id – UUID representing the subnet to update.
• subnet – dictionary with keys indicating fields to update. valid keys are those that have a value of True for ‘allow_put’ as listed in the RESOURCE_ATTRIBUTE_MAP object in neutron/api/v2/attributes.py.

update_subnetpool(context, id, subnetpool)

Update a subnet pool.

Parameters:

• context – neutron api request context
• subnetpool – Dictionary representing the subnetpool attributes to update.