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Asynchronous MPD client library

Project description

Uses python asyncio for asynchronous communication with a Music Player Daemon server.

Connection is established by a client object. Requests (MPD commands) are executed in asyncio coroutines, referred to here as “tasks”. Requests are generated by an executor object. Each client has a root executor, and sub-executors can be constructed (for grouping related tasks).

Tasks

An AMPD task is, essentially, an asyncio coroutine. The @task decorator makes the coroutine execute immediately via asyncio.ensure_future. In addition, it wraps it so cancellation and disconnect exceptions are considered normal termination:

@task
async def task_example():
    ...
    reply = await executor.request1(a, b)
    ...
    reply = await executor.request2()
    ...

The request can be:

  1. An MPD command [1] (other than idle and noidle). Returns when the server’s reply arrives:

    await executor.play(5)
    reply = await executor.status()
    
  2. Idle request:

    reply = await executor.idle(event_mask, timeout=None)
    

    This emulates MPD’s idle command, with some improvements. The timeout is given in seconds. Possible event flags are:

    • Event.*SUBSYSTEM* (in uppercase) or ANY to match any subsystem.
    • Event.CONNECT - client is connected to server.
    • Event.IDLE - client is idle.

    Returns the mask of events which actually occurred, or Event.TIMEOUT if timeout occurred.

  3. Command list: executor.command_list(iterable).

[1]For MPD commands and subsystems see http://www.musicpd.org/doc/protocol/command_reference.html

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