Extension API

If you want to learn how to make Mopidy extensions, read Extension development.

class mopidy.ext.Extension[source]

Base class for Mopidy extensions

dist_name = None

The extension’s distribution name, as registered on PyPI

Example: Mopidy-Soundspot

ext_name = None

The extension’s short name, as used in setup.py and as config section name

Example: soundspot


Command to expose to command line users running mopidy.

Returns:Instance of a Command class.

The extension’s config validation schema


The extension’s default config as a bytestring

Returns:bytes or unicode

Register the extension’s components in the extension Registry.

For example, to register a backend:

def setup(self, registry):
    from .backend import SoundspotBackend
    registry.add('backend', SoundspotBackend)

See Registry for a list of registry keys with a special meaning. Mopidy will instantiate and start any classes registered under the frontend and backend registry keys.

This method can also be used for other setup tasks not involving the extension registry. For example, to register custom GStreamer elements:

def setup(self, registry):
    from .mixer import SoundspotMixer
        SoundspotMixer, 'soundspotmixer', gst.RANK_MARGINAL)
Parameters:registry (Registry) – the extension registry

Checks if the extension can run in the current environment.

Dependencies described by setup.py are checked by Mopidy, so you should not check their presence here.

If a problem is found, raise ExtensionError with a message explaining the issue.

version = None

The extension’s version

Should match the __version__ attribute on the extension’s main Python module and the version registered on PyPI.

class mopidy.ext.Registry[source]

Registry of components provided by Mopidy extensions.

Passed to the setup() method of all extensions. The registry can be used like a dict of string keys and lists.

Some keys have a special meaning, including, but not limited to:

  • backend is used for Mopidy backend classes.
  • frontend is used for Mopidy frontend classes.
  • local:library is used for Mopidy-Local libraries.

Extensions can use the registry for allow other to extend the extension itself. For example the Mopidy-Local use the local:library key to allow other extensions to register library providers for Mopidy-Local to use. Extensions should namespace custom keys with the extension’s ext_name, e.g. local:foo or http:bar.

add(name, cls)[source]

Add a component to the registry.

Multiple classes can be registered to the same name.


Find all installed extensions.

Returns:list of installed extensions

Verify extension’s dependencies and environment.

Parameters:extensions – an extension to check
Returns:if extension should be run