hyperion-py 0.2.0

Hyperion Ambient Lighting Python Package

Hyperion Library

Python library for Hyperion-NG. See JSON API for more details about the inputs and outputs of this library.

Usage

Client API calls

All API calls can be found in client.py. All async calls start with async_.

Data model philosophy

Whilst not universally true, this library attempts to precisely represent the data model, API and parameters as defined in the Hyperion JSON documentation. Thus no attempt is made (intentionally) to present convenient accessors/calls at a finer level of granularity than the model already supports. This is to ensure the client has a decent chance at staying functional regardless of underlying data model changes from the server, and the responsibility to match the changes to the server's data model (e.g. new Hyperion server features) belong to the caller.

Connection & Disconnection

• async_connect()
• async_disconnect()

Native API Calls

Send request and await response	Send request only	Documentation
async_clear	async_send_clear	Docs
async_image_stream_start	async_send_image_stream_start	Docs
async_image_stream_stop	async_send_image_stream_stop	Docs
async_is_auth_required	async_send_is_auth_required	Docs
async_led_stream_start	async_send_led_stream_start	Docs
async_led_stream_stop	async_send_led_stream_stop	Docs
async_login	async_send_login	Docs
async_logout	async_send_logout	Docs
async_request_token	async_send_request_token	Docs
async_request_token_abort	async_send_request_token_abort	Docs
async_set_adjustment	async_send_set_adjustment	Docs
async_set_color	async_send_set_color	Docs
async_set_component	async_send_set_component	Docs
async_set_effect	async_send_set_effect	Docs
async_set_image	async_send_set_image	Docs
async_set_led_mapping_type	async_send_set_led_mapping_type	Docs
async_set_sourceselect	async_send_set_sourceselect	Docs
async_set_videomode	async_send_set_videomode	Docs
async_start_instance	async_send_start_instance	Docs
async_stop_instance	async_send_stop_instance	Docs
async_switch_instance	async_send_switch_instance	Docs

Note that the command and subcommand keys shown in the above linked documentation will automatically be included in the calls the client sends, and do not need to be specified.

Client inputs / outputs

The API parameters and output are all as defined in the JSON API documentation.

Example usage:

#!/usr/bin/python

import asyncio
from hyperion import client, const

HOST = "hyperion"

async def print_brightness():
    hyperion_client = client.HyperionClient(HOST)
    if not await hyperion_client.async_connect():
        return
    print("Brightness: %i%%" % hyperion_client.adjustment[0][const.KEY_BRIGHTNESS])

if __name__ == "__main__":
    asyncio.get_event_loop().run_until_complete(print_brightness())

Running in the background

A background asyncio task runs to process all post-connection inbound data (e.g. request responses, or subscription updates from state changes on the server side). This background task must either be started post-connection, or start (and it will itself establish connection).

Optionally, this background task can call callbacks back to the user.

Waiting for responses

If the user makes a call that does not have _send_ in the name (see table above), the function call will wait for the response and return it to the caller. This matching of request & response is done via the tan parameter. If not specified, the client will automatically attach a tan integer, and this will be visible in the returned output data. This matching is necessary to differentiate between responses due to requests, and "spontaneous data" from subscription updates.

Example: Waiting for a response

#!/usr/bin/python

from hyperion import client

async def go():
    hc = client.HyperionClient('hyperion')
    await hc.async_connect()

    hc.start_background_task()

    result = await hc.async_is_auth_required()
    print("Result: %s" % result)

import asyncio
asyncio.get_event_loop().run_until_complete(go())

Output:

Result: {'command': 'authorize-tokenRequired', 'info': {'required': False}, 'success': True, 'tan': 1}

Callbacks

The client can be configured to callback as the Hyperion server reports new values. There are two classes of callbacks supported:

• default_callback: This callback will be called when a more specific callback is not specified.
• callbacks: A dict of callbacks keyed on the Hyperion subscription 'command' (see JSON API documentation)

Callbacks can be specified in the HyperionClient constructor (default_callback= or callbacks= arguments) or after construction via the set_callbacks() and set_default_callback() methods.

As above, the callbacks dict is keyed on the relevant Hyperion subscription command (e.g. components-update, priorities-update). The client also provides a custom callback with command connection-update of the following form:

{"command": "connection-update",
 "connected": True}

This can be used to take special action as the client connects or disconnects from the server.

Example: Callbacks

from hyperion import client, const

HOST = "hyperion"

def callback(json):
    print("Received Hyperion command: %s" % json)

if __name__ == "__main__":
    hyperion_client = client.HyperionClient(HOST, default_callback=callback)
    asyncio.get_event_loop().run_until_complete(hyperion_client.async_connect())

    # Start client in "background".
    hyperion_client.start_background_task()
    asyncio.get_event_loop().run_forever()

Output:

Received Hyperion command: {'command': 'connection-update', 'connected': True}

ThreadedHyperionClient

A ThreadedHyperionClient is also provided as a convenience wrapper to for non-async code. The ThreadedHyperionClient wraps the async calls with non-async versions (without the async_ on the method names shown above).

Example use of Threaded client

#!/usr/bin/python

from hyperion import client, const

HOST = "hyperion"

if __name__ == "__main__":
    hyperion_client = client.ThreadedHyperionClient(HOST)

    # Start the asyncio loop in a new thread.
    hyperion_client.start()

    # Connect the client.
    hyperion_client.connect()

    print("Brightness: %i%%" % hyperion_client.adjustment[0][const.KEY_BRIGHTNESS])

    # Stop the loop (will stop the thread).
    hyperion_client.stop()

    # Join the created thread.
    hyperion_client.join()

Output:

Brightness: 59%

Exceptions

Philosophy

HyperionClient strives not to throw an exception regardless of network circumstances, reconnection will automatically happen in the background. Exceptions are only raised (intentionally) for instances of likely programmer error.

HyperionError

Not directly raised, but other exceptions inherit from this.

HyperionClientConnectAfterStartError

Exception raised if connect() or async_connect() is called after start_background_task(). Either only start_background_task() should be called (it will automatically connect), or async_connect()/connect() should be called first, followed by start_background_task() once the connect call has returned.

HyperionClientTanNotAvailable

Exception raised if a tan parameter is provided to an API call, but that tan parameter is already being used by another in-progress call. Users should either not specify tan at all (and the client library will automatically manage it in an incremental fashion), or if specified manually, it is the caller's responsibility to ensure no two simultaneous calls share a tan (as otherwise the client would not be able to match the call to the response, and this exception will be raised automatically prior to the call).