Added a system monitoring platform to the sensor component

config/configuration.yaml.example

@@ -102,3 +102,15 @@ automation 2:
 
   execute_service: notify.notify
   service_data: {"message":"It's 4, time for beer!"}
+
+sensor:
+  platform: systemmonitor
+  devices:
+    - {type: 'disk_use_percent', arg: '/'}
+    - {type: 'disk_use_percent', arg: '/home'}
+    - {type: 'disk_use', arg: '/home'}
+    - {type: 'disk_free', arg: '/'}
+    - {type: 'memory_use_percent'}
+    - {type: 'memory_use'}
+    - {type: 'memory_free'}
+    - {type: 'processor_use'}

homeassistant/components/sensor/systemmonitor.py

@@ -0,0 +1,89 @@
+"""
+homeassistant.components.sensor.systemmonitor
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Shows system monitor values such as: disk, memory and processor use
+
+"""
+
+from homeassistant.helpers.device import Device
+from homeassistant.const import (
+    ATTR_UNIT_OF_MEASUREMENT, ATTR_FRIENDLY_NAME)
+import psutil
+import logging
+
+sensor_types = {
+    'disk_use_percent': ['Disk Use', '%'],
+    'disk_use': ['Disk Use', 'GiB'],
+    'disk_free': ['Disk Free', 'GiB'],
+    'memory_use_percent': ['RAM Use', '%'],
+    'memory_use': ['RAM Use', 'MiB'],
+    'memory_free': ['RAM Free', 'MiB'],
+    'processor_use': ['CPU Use', '%'],
+}
+
+_LOGGER = logging.getLogger(__name__)
+
+# pylint: disable=unused-argument
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """ Sets up the sensors """
+
+    devices = []
+    for device in config['devices']:
+        if 'arg' not in device:
+            device['arg'] = ''
+        if device['type'] not in sensor_types:
+            _LOGGER.error('Sensor type: "%s" does not exist', device['type'])
+        else:
+            devices.append(SystemMonitorSensor(device['type'], device['arg']))
+
+    add_devices(devices)
+
+
+class SystemMonitorSensor(Device):
+    """ A system monitor sensor """
+
+    def __init__(self, type, argument=''):
+        self._name = sensor_types[type][0] + ' ' + argument
+        self.argument = argument
+        self.type = type
+        self._state = None
+        self.unit_of_measurement = sensor_types[type][1]
+        self.update()
+
+    @property
+    def name(self):
+        return self._name
+
+    @property
+    def state(self):
+        """ Returns the state of the device. """
+        return self._state
+
+    @property
+    def state_attributes(self):
+        """ Returns the state attributes. """
+        return {
+            ATTR_FRIENDLY_NAME: self.name,
+            ATTR_UNIT_OF_MEASUREMENT: self.unit_of_measurement,
+        }
+
+    def update(self):
+        if self.type == 'disk_use_percent':
+            self._state = psutil.disk_usage(self.argument).percent
+        elif self.type == 'disk_use':
+            self._state = round(psutil.disk_usage(self.argument).used /
+                                1024**3, 1)
+        elif self.type == 'disk_free':
+            self._state = round(psutil.disk_usage(self.argument).free /
+                                1024**3, 1)
+        elif self.type == 'memory_use_percent':
+            self._state = psutil.virtual_memory().percent
+        elif self.type == 'memory_use':
+            self._state = round((psutil.virtual_memory().total -
+                                 psutil.virtual_memory().available) /
+                                1024**2, 1)
+        elif self.type == 'memory_free':
+            self._state = round(psutil.virtual_memory().available / 1024**2, 1)
+        elif self.type == 'processor_use':
+            self._state = round(psutil.cpu_percent(interval=None))

requirements.txt

@@ -35,3 +35,6 @@ pydispatcher>=2.0.5
 
 # pyyaml
 pyyaml
+
+# psutil
+psutil