OSC Server

API

The OSC server handles the backend communication from SuperCollider. As OSC useses UDP and it is designed in an async manner we have to send back any result from SuperCollider via a new OSC message. As Django does not natively understand UDP messages and OSC is a rather restrictive protocol we created this server which is able to receive this messages and makes it available to our Django app by using its ORM.

Each SuperCollider instance sends a beacon in order to get discovered by the backend as a StreamPoint.

This is not a Django app but an application on its own.

Todo

A long term goal would be to include this into the Django process but it seems gunicorn only runs when a request hits, making the necessary polling for received messages not working properly.

Server

A naive server to receive OSC messages from SuperCollider.

class osc_server.server.OSCServer

Uses pythonosc to map the routes

Routes

route	method	message
/beacon	beacon_handler()	SCBeaconMessage
/acknowledge_handler	acknowledge_handler()	SCAcknowledgeMessage
/remote/action	remote_action_handler()	RemoteActionMessage

__init__()

acknowledge_handler(client_address, address, *osc_args)

Acknowledges a message and updates its associated StreamInstruction.

Return type:

None

beacon_handler(client_address, address, *osc_args)

Accepts a beacon from SuperCollider and creates a StreamPoint from it so it gets discovered by the backend.

Return type:

None

remote_action_handler(client_address, address, *osc_args)

Remote actions are used to trigger actions on a SuperCollider instance and can be send in form of a StreamInstruction or raw from a local running SuperCollider instance which can be used to live code the SuperCollider instances managed by Gencaster.

Return type:

None

Models

Allows to use some static type checks for messages receiving from SuperCollider.

OSCAuthMixin

Allows to validate a given password for backends.
type	object
properties
password	Password
	type	string

SCAcknowledgeMessage

See StreamInstruction.
type	object
properties
uuid	Uuid
	UUID from stream.models.StreamInstruction
	type	string
status	#/definitions/GenCasterStatusEnum
return_value	Return Value
	Allows to store a return value in the database if given.
	type	string
definitions
GenCasterStatusEnum	GenCasterStatusEnum
	Status of our callback.
	type	string
	enum	SUCCESS, FAILURE, READY, FINISHED, BEACON, RECEIVED

SCBeaconMessage

Will create a StreamPoint.
type	object
properties
name	Name
	type	string
synth_port	Synth Port
	type	integer
lang_port	Lang Port
	type	integer
janus_out_port	Janus Out Port
	type	integer
janus_in_port	Janus In Port
	type	integer
janus_out_room	Janus Out Room
	type	integer
janus_in_room	Janus In Room
	type	integer
janus_public_ip	Janus Public Ip
	type	string
use_input	Use Input
	type	boolean
osc_backend_host	Osc Backend Host
	type	string
osc_backend_port	Osc Backend Port
	type	integer

RemoteActionMessage

Sends message to SuperCollider cluster.
type	object
properties
password	Password
	type	string
action	#/definitions/RemoteActionType
cmd	Cmd
	type	string
target	Target
	type	string
protocol_version	Protocol Version
	Can be used to upgrade our communication by rejecting older clients/messages
	type	string
definitions
RemoteActionType	RemoteActionType
	Requests an action on SuperCollider instance.
	type	string
	enum	code, speak

exception osc_server.exceptions.MalformedOscMessage

OSC message has wrong layout.

exception osc_server.exceptions.OscBackendAuthException

Authentication failed.