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Make the rpi_rf component thread-safe using an RLock (#11487)

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* Make the rpi_rf component thread-safe

The previous implementation suffered from race conditions when two rpi_rf switches are triggered at the same time. This implementation uses an RLock to give one thread at a time exclusive access to the rfdevice object.

* cleanup

* fix lint
This commit is contained in:
Ulrich Dobramysl 2018-01-11 12:47:05 +00:00 committed by Pascal Vizeli
parent d2b6660881
commit cf612c3d5b
1 changed files with 9 additions and 6 deletions
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9
homeassistant/components/switch/rpi_rf.py
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@ -48,18 +48,20 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
def setup_platform(hass, config, add_devices, discovery_info=None): def setup_platform(hass, config, add_devices, discovery_info=None):
"""Find and return switches controlled by a generic RF device via GPIO.""" """Find and return switches controlled by a generic RF device via GPIO."""
import rpi_rf import rpi_rf
from threading import RLock
gpio = config.get(CONF_GPIO) gpio = config.get(CONF_GPIO)
rfdevice = rpi_rf.RFDevice(gpio) rfdevice = rpi_rf.RFDevice(gpio)
rfdevice_lock = RLock()
switches = config.get(CONF_SWITCHES) switches = config.get(CONF_SWITCHES)
devices = [] devices = []
for dev_name, properties in switches.items(): for dev_name, properties in switches.items():
devices.append( devices.append(
RPiRFSwitch( RPiRFSwitch(
hass,
properties.get(CONF_NAME, dev_name), properties.get(CONF_NAME, dev_name),
rfdevice, rfdevice,
rfdevice_lock,
properties.get(CONF_PROTOCOL), properties.get(CONF_PROTOCOL),
properties.get(CONF_PULSELENGTH), properties.get(CONF_PULSELENGTH),
properties.get(CONF_SIGNAL_REPETITIONS), properties.get(CONF_SIGNAL_REPETITIONS),
@ -79,13 +81,13 @@ def setup_platform(hass, config, add_devices, discovery_info=None):
class RPiRFSwitch(SwitchDevice): class RPiRFSwitch(SwitchDevice):
"""Representation of a GPIO RF switch.""" """Representation of a GPIO RF switch."""
def __init__(self, hass, name, rfdevice, protocol, pulselength, def __init__(self, name, rfdevice, lock, protocol, pulselength,
signal_repetitions, code_on, code_off): signal_repetitions, code_on, code_off):
"""Initialize the switch.""" """Initialize the switch."""
self._hass = hass
self._name = name self._name = name
self._state = False self._state = False
self._rfdevice = rfdevice self._rfdevice = rfdevice
self._lock = lock
self._protocol = protocol self._protocol = protocol
self._pulselength = pulselength self._pulselength = pulselength
self._code_on = code_on self._code_on = code_on
@ -109,6 +111,7 @@ class RPiRFSwitch(SwitchDevice):
def _send_code(self, code_list, protocol, pulselength): def _send_code(self, code_list, protocol, pulselength):
"""Send the code(s) with a specified pulselength.""" """Send the code(s) with a specified pulselength."""
with self._lock:
_LOGGER.info("Sending code(s): %s", code_list) _LOGGER.info("Sending code(s): %s", code_list)
for code in code_list: for code in code_list:
self._rfdevice.tx_code(code, protocol, pulselength) self._rfdevice.tx_code(code, protocol, pulselength)