supervisord sensor (#2056)

.coveragerc

@@ -166,6 +166,7 @@ omit =
     homeassistant/components/sensor/sabnzbd.py
     homeassistant/components/sensor/speedtest.py
     homeassistant/components/sensor/steam_online.py
+    homeassistant/components/sensor/supervisord.py
     homeassistant/components/sensor/swiss_public_transport.py
     homeassistant/components/sensor/systemmonitor.py
     homeassistant/components/sensor/temper.py

homeassistant/components/sensor/supervisord.py

@@ -0,0 +1,61 @@
+"""
+Sensor for Supervisord process status.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/sensor.supervisord/
+"""
+import logging
+import xmlrpc.client
+
+from homeassistant.helpers.entity import Entity
+
+_LOGGER = logging.getLogger(__name__)
+
+
+# pylint: disable=unused-argument
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """Setup the Supervisord platform."""
+    try:
+        supervisor_server = xmlrpc.client.ServerProxy(
+            config.get('url', 'http://localhost:9001/RPC2'))
+    except ConnectionRefusedError:
+        _LOGGER.error('Could not connect to Supervisord')
+        return
+    processes = supervisor_server.supervisor.getAllProcessInfo()
+    add_devices(
+        [SupervisorProcessSensor(info, supervisor_server)
+         for info in processes])
+
+
+class SupervisorProcessSensor(Entity):
+    """Represent a supervisor-monitored process."""
+
+    # pylint: disable=abstract-method
+    def __init__(self, info, server):
+        """Initialize the sensor."""
+        self._info = info
+        self._server = server
+        self.update()
+
+    @property
+    def name(self):
+        """Return the name of the sensor."""
+        return self._info.get('name')
+
+    @property
+    def state(self):
+        """Return the state of the sensor."""
+        return self._info.get('statename')
+
+    def update(self):
+        """Update device state."""
+        self._info = self._server.supervisor.getProcessInfo(
+            self._info.get('name'))
+
+    @property
+    def device_state_attributes(self):
+        """Return the state attributes."""
+        return {
+            'group': self._info.get('group'),
+            'description': self._info.get('description')
+        }