Use constants, update configuration check, and ordering (Pilight) (#3118)

* Use contants, update configuration check, and ordering

* Fix pylint issue

homeassistant/components/pilight.py

@@ -4,7 +4,6 @@ Component to create an interface to a Pilight daemon (https://pilight.org/).
 For more details about this component, please refer to the documentation at
 https://home-assistant.io/components/pilight/
 """
-# pylint: disable=import-error
 import logging
 import socket
 
@@ -12,46 +11,49 @@ import voluptuous as vol
 
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.config_validation import ensure_list
-from homeassistant.const import EVENT_HOMEASSISTANT_START
-from homeassistant.const import EVENT_HOMEASSISTANT_STOP
-from homeassistant.const import CONF_HOST, CONF_PORT
+from homeassistant.const import (
+    EVENT_HOMEASSISTANT_START, EVENT_HOMEASSISTANT_STOP, CONF_HOST, CONF_PORT,
+    CONF_WHITELIST)
 
 REQUIREMENTS = ['pilight==0.0.2']
 
-DOMAIN = "pilight"
+_LOGGER = logging.getLogger(__name__)
+
+ATTR_PROTOCOL = 'protocol'
+
+DEFAULT_HOST = '127.0.0.1'
+DEFAULT_PORT = 5000
+DOMAIN = 'pilight'
+
 EVENT = 'pilight_received'
-SERVICE_NAME = 'send'
-
-CONF_WHITELIST = 'whitelist'
-
-CONFIG_SCHEMA = vol.Schema({
-    DOMAIN: vol.Schema({
-        vol.Required(CONF_HOST, default='127.0.0.1'): cv.string,
-        vol.Required(CONF_PORT, default=5000): vol.Coerce(int),
-        vol.Optional(CONF_WHITELIST): {cv.string: [cv.string]}
-    }),
-}, extra=vol.ALLOW_EXTRA)
 
 # The pilight code schema depends on the protocol
 # Thus only require to have the protocol information
-ATTR_PROTOCOL = 'protocol'
 RF_CODE_SCHEMA = vol.Schema({vol.Required(ATTR_PROTOCOL): cv.string},
                             extra=vol.ALLOW_EXTRA)
+SERVICE_NAME = 'send'
 
-_LOGGER = logging.getLogger(__name__)
+CONFIG_SCHEMA = vol.Schema({
+    DOMAIN: vol.Schema({
+        vol.Required(CONF_HOST, default=DEFAULT_HOST): cv.string,
+        vol.Required(CONF_PORT, default=DEFAULT_PORT): cv.port,
+        vol.Optional(CONF_WHITELIST, default={}): {cv.string: [cv.string]}
+    }),
+}, extra=vol.ALLOW_EXTRA)
 
 
 def setup(hass, config):
     """Setup the pilight component."""
     from pilight import pilight
 
+    host = config[DOMAIN][CONF_HOST]
+    port = config[DOMAIN][CONF_PORT]
+
     try:
-        pilight_client = pilight.Client(host=config[DOMAIN][CONF_HOST],
-                                        port=config[DOMAIN][CONF_PORT])
+        pilight_client = pilight.Client(host=host, port=port)
     except (socket.error, socket.timeout) as err:
-        _LOGGER.error(
-            "Unable to connect to %s on port %s: %s",
-            config[CONF_HOST], config[CONF_PORT], err)
+        _LOGGER.error("Unable to connect to %s on port %s: %s",
+                      host, port, err)
         return False
 
     # Start / stop pilight-daemon connection with HA start/stop
@@ -74,7 +76,7 @@ def setup(hass, config):
         # Patch data because of bug:
         # https://github.com/pilight/pilight/issues/296
         # Protocol has to be in a list otherwise segfault in pilight-daemon
-        message_data["protocol"] = ensure_list(message_data["protocol"])
+        message_data['protocol'] = ensure_list(message_data['protocol'])
 
         try:
             pilight_client.send_code(message_data)
@@ -86,7 +88,7 @@ def setup(hass, config):
 
     # Publish received codes on the HA event bus
     # A whitelist of codes to be published in the event bus
-    whitelist = config[DOMAIN].get('whitelist', False)
+    whitelist = config[DOMAIN].get(CONF_WHITELIST)
 
     def handle_received_code(data):
         """Called when RF codes are received."""