blockchain.info sensor (#7856)

* blockchain sensor

* Update blockchain.py

* Update blockchain.py

* add validation of btc addresses

.coveragerc

@@ -372,6 +372,7 @@ omit =
     homeassistant/components/sensor/arwn.py
     homeassistant/components/sensor/bbox.py
     homeassistant/components/sensor/bitcoin.py
+    homeassistant/components/sensor/blockchain.py
     homeassistant/components/sensor/bom.py
     homeassistant/components/sensor/broadlink.py
     homeassistant/components/sensor/dublin_bus_transport.py

homeassistant/components/sensor/blockchain.py

@@ -0,0 +1,62 @@
+"""
+Support for Blockchain.info sensors.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/sensor.blockchain/
+"""
+import logging
+from homeassistant.components.sensor import PLATFORM_SCHEMA
+from homeassistant.helpers.entity import Entity
+import homeassistant.helpers.config_validation as cv
+import voluptuous as vol
+
+REQUIREMENTS = ['python-blockchain-api==0.0.2']
+_LOGGER = logging.getLogger(__name__)
+CONF_ADDRESSES = 'addresses'
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_ADDRESSES): [cv.string]
+})
+
+
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """Set up the blockchain sensors."""
+    from pyblockchain import validate_address
+    addresses = config.get(CONF_ADDRESSES)
+    for address in addresses:
+        if not validate_address(address):
+            _LOGGER.error("Bitcoin address is not valid: " + address)
+            return False
+    add_devices([BlockchainSensor('Bitcoin Balance', addresses)])
+
+
+class BlockchainSensor(Entity):
+    """Representation of a blockchain.info sensor."""
+
+    def __init__(self, name, addresses):
+        """Initialize the sensor."""
+        self._name = name
+        self.addresses = addresses
+        self._state = None
+        self._unit_of_measurement = 'BTC'
+        self.update()
+
+    @property
+    def name(self):
+        """Return the name of the sensor."""
+        return self._name
+
+    @property
+    def state(self):
+        """Return the state of the sensor."""
+        return self._state
+
+    @property
+    def unit_of_measurement(self):
+        """Return the unit of measurement this sensor expresses itself in."""
+        return self._unit_of_measurement
+
+    def update(self):
+        """Get the latest state of the sensor."""
+        from pyblockchain import get_balance
+        self._state = get_balance(self.addresses)

requirements_all.txt

@@ -645,6 +645,9 @@ pysnmp==4.3.7
 # homeassistant.components.switch.thinkingcleaner
 pythinkingcleaner==0.0.3
 
+# homeassistant.components.sensor.blockchain
+python-blockchain-api==0.0.2
+
 # homeassistant.components.media_player.clementine
 python-clementine-remote==1.0.1