Fix async IO in Sesame lock component. (#11054)

* Call update on Sesame devices to cache initial state

* Switch to using async_add_devices

* Fix line length

* Fix Lint errors

* Fix more Lint errors

* Cache pysesame properties

* Updates from CR feedback

homeassistant/components/lock/sesame.py

@@ -25,46 +25,53 @@ PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
 
 
 # pylint: disable=unused-argument
-def setup_platform(hass, config: ConfigType,
-                   add_devices: Callable[[list], None], discovery_info=None):
+def setup_platform(
+        hass, config: ConfigType,
+        add_devices: Callable[[list], None], discovery_info=None):
     """Set up the Sesame platform."""
     import pysesame
 
     email = config.get(CONF_EMAIL)
     password = config.get(CONF_PASSWORD)
 
-    add_devices([SesameDevice(sesame) for
-                 sesame in pysesame.get_sesames(email, password)])
+    add_devices([SesameDevice(sesame) for sesame in
+                 pysesame.get_sesames(email, password)],
+                update_before_add=True)
 
 
 class SesameDevice(LockDevice):
     """Representation of a Sesame device."""
 
-    _sesame = None
-
     def __init__(self, sesame: object) -> None:
         """Initialize the Sesame device."""
         self._sesame = sesame
 
+        # Cached properties from pysesame object.
+        self._device_id = None
+        self._nickname = None
+        self._is_unlocked = False
+        self._api_enabled = False
+        self._battery = -1
+
     @property
     def name(self) -> str:
         """Return the name of the device."""
-        return self._sesame.nickname
+        return self._nickname
 
     @property
     def available(self) -> bool:
         """Return True if entity is available."""
-        return self._sesame.api_enabled
+        return self._api_enabled
 
     @property
     def is_locked(self) -> bool:
         """Return True if the device is currently locked, else False."""
-        return not self._sesame.is_unlocked
+        return not self._is_unlocked
 
     @property
     def state(self) -> str:
         """Get the state of the device."""
-        if self._sesame.is_unlocked:
+        if self._is_unlocked:
             return STATE_UNLOCKED
         return STATE_LOCKED
 
@@ -79,11 +86,16 @@ class SesameDevice(LockDevice):
     def update(self) -> None:
         """Update the internal state of the device."""
         self._sesame.update_state()
+        self._nickname = self._sesame.nickname
+        self._api_enabled = self._sesame.api_enabled
+        self._is_unlocked = self._sesame.is_unlocked
+        self._device_id = self._sesame.device_id
+        self._battery = self._sesame.battery
 
     @property
     def device_state_attributes(self) -> dict:
         """Return the state attributes."""
         attributes = {}
-        attributes[ATTR_DEVICE_ID] = self._sesame.device_id
-        attributes[ATTR_BATTERY_LEVEL] = self._sesame.battery
+        attributes[ATTR_DEVICE_ID] = self._device_id
+        attributes[ATTR_BATTERY_LEVEL] = self._battery
         return attributes