"""Switch logic for loading/unloading pulseaudio loopback modules.""" from datetime import timedelta import logging import re import socket import voluptuous as vol from homeassistant import util from homeassistant.components.switch import PLATFORM_SCHEMA, SwitchDevice from homeassistant.const import CONF_HOST, CONF_NAME, CONF_PORT import homeassistant.helpers.config_validation as cv _LOGGER = logging.getLogger(__name__) _PULSEAUDIO_SERVERS = {} CONF_BUFFER_SIZE = "buffer_size" CONF_SINK_NAME = "sink_name" CONF_SOURCE_NAME = "source_name" CONF_TCP_TIMEOUT = "tcp_timeout" DEFAULT_BUFFER_SIZE = 1024 DEFAULT_HOST = "localhost" DEFAULT_NAME = "paloopback" DEFAULT_PORT = 4712 DEFAULT_TCP_TIMEOUT = 3 IGNORED_SWITCH_WARN = "Switch is already in the desired state. Ignoring." LOAD_CMD = "load-module module-loopback sink={0} source={1}" MIN_TIME_BETWEEN_FORCED_SCANS = timedelta(milliseconds=100) MIN_TIME_BETWEEN_SCANS = timedelta(seconds=10) MOD_REGEX = ( r"index: ([0-9]+)\s+name: " r"\s+argument: (?=<.*sink={0}.*>)(?=<.*source={1}.*>)" ) UNLOAD_CMD = "unload-module {0}" PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend( { vol.Required(CONF_SINK_NAME): cv.string, vol.Required(CONF_SOURCE_NAME): cv.string, vol.Optional(CONF_BUFFER_SIZE, default=DEFAULT_BUFFER_SIZE): cv.positive_int, vol.Optional(CONF_HOST, default=DEFAULT_HOST): cv.string, vol.Optional(CONF_NAME, default=DEFAULT_NAME): cv.string, vol.Optional(CONF_PORT, default=DEFAULT_PORT): cv.port, vol.Optional(CONF_TCP_TIMEOUT, default=DEFAULT_TCP_TIMEOUT): cv.positive_int, } ) def setup_platform(hass, config, add_entities, discovery_info=None): """Read in all of our configuration, and initialize the loopback switch.""" name = config.get(CONF_NAME) sink_name = config.get(CONF_SINK_NAME) source_name = config.get(CONF_SOURCE_NAME) host = config.get(CONF_HOST) port = config.get(CONF_PORT) buffer_size = config.get(CONF_BUFFER_SIZE) tcp_timeout = config.get(CONF_TCP_TIMEOUT) server_id = str.format("{0}:{1}", host, port) if server_id in _PULSEAUDIO_SERVERS: server = _PULSEAUDIO_SERVERS[server_id] else: server = PAServer(host, port, buffer_size, tcp_timeout) _PULSEAUDIO_SERVERS[server_id] = server add_entities([PALoopbackSwitch(hass, name, server, sink_name, source_name)]) class PAServer: """Representation of a Pulseaudio server.""" _current_module_state = "" def __init__(self, host, port, buff_sz, tcp_timeout): """Initialize PulseAudio server.""" self._pa_host = host self._pa_port = int(port) self._buffer_size = int(buff_sz) self._tcp_timeout = int(tcp_timeout) def _send_command(self, cmd, response_expected): """Send a command to the pa server using a socket.""" sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(self._tcp_timeout) try: sock.connect((self._pa_host, self._pa_port)) _LOGGER.info("Calling pulseaudio: %s", cmd) sock.send((cmd + "\n").encode("utf-8")) if response_expected: return_data = self._get_full_response(sock) _LOGGER.debug("Data received from pulseaudio: %s", return_data) else: return_data = "" finally: sock.close() return return_data def _get_full_response(self, sock): """Get the full response back from pulseaudio.""" result = "" rcv_buffer = sock.recv(self._buffer_size) result += rcv_buffer.decode("utf-8") while len(rcv_buffer) == self._buffer_size: rcv_buffer = sock.recv(self._buffer_size) result += rcv_buffer.decode("utf-8") return result @util.Throttle(MIN_TIME_BETWEEN_SCANS, MIN_TIME_BETWEEN_FORCED_SCANS) def update_module_state(self): """Refresh state in case an alternate process modified this data.""" self._current_module_state = self._send_command("list-modules", True) def turn_on(self, sink_name, source_name): """Send a command to pulseaudio to turn on the loopback.""" self._send_command(str.format(LOAD_CMD, sink_name, source_name), False) def turn_off(self, module_idx): """Send a command to pulseaudio to turn off the loopback.""" self._send_command(str.format(UNLOAD_CMD, module_idx), False) def get_module_idx(self, sink_name, source_name): """For a sink/source, return its module id in our cache, if found.""" result = re.search( str.format(MOD_REGEX, re.escape(sink_name), re.escape(source_name)), self._current_module_state, ) if result and result.group(1).isdigit(): return int(result.group(1)) return -1 class PALoopbackSwitch(SwitchDevice): """Representation the presence or absence of a PA loopback module.""" def __init__(self, hass, name, pa_server, sink_name, source_name): """Initialize the Pulseaudio switch.""" self._module_idx = -1 self._hass = hass self._name = name self._sink_name = sink_name self._source_name = source_name self._pa_svr = pa_server @property def name(self): """Return the name of the switch.""" return self._name @property def is_on(self): """Return true if device is on.""" return self._module_idx > 0 def turn_on(self, **kwargs): """Turn the device on.""" if not self.is_on: self._pa_svr.turn_on(self._sink_name, self._source_name) self._pa_svr.update_module_state(no_throttle=True) self._module_idx = self._pa_svr.get_module_idx( self._sink_name, self._source_name ) self.schedule_update_ha_state() else: _LOGGER.warning(IGNORED_SWITCH_WARN) def turn_off(self, **kwargs): """Turn the device off.""" if self.is_on: self._pa_svr.turn_off(self._module_idx) self._pa_svr.update_module_state(no_throttle=True) self._module_idx = self._pa_svr.get_module_idx( self._sink_name, self._source_name ) self.schedule_update_ha_state() else: _LOGGER.warning(IGNORED_SWITCH_WARN) def update(self): """Refresh state in case an alternate process modified this data.""" self._pa_svr.update_module_state() self._module_idx = self._pa_svr.get_module_idx( self._sink_name, self._source_name )