Add tasks and watchdog for homeassistant (#39)

* Add tasks and watchdog for homeassistant

* code cleanup

hassio/tasks.py

@@ -0,0 +1,47 @@
+"""Multible tasks."""
+import asyncio
+import logging
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def hassio_update(config, supervisor):
+    """Create scheduler task for update of supervisor hassio."""
+    async def _hassio_update():
+        """Check and run update of supervisor hassio."""
+        if config.last_hassio == supervisor.version:
+            return
+
+        _LOGGER.info("Found new HassIO version %s.", config.last_hassio)
+        await supervisor.update(config.last_hassio)
+
+    return _hassio_update
+
+
+def homeassistant_watchdog(loop, homeassistant):
+    """Create scheduler task for montoring running state."""
+    async def _homeassistant_watchdog():
+        """Check running state and start if they is close."""
+        if homeassistant.in_progress or await homeassistant.is_running():
+            return
+
+        loop.create_task(homeassistant.run())
+
+    return _homeassistant_watchdog
+
+
+async def homeassistant_setup(config, loop, homeassistant):
+    """Install a homeassistant docker container."""
+    while True:
+        # read homeassistant tag and install it
+        if not config.last_homeassistant:
+            await config.fetch_update_infos()
+
+        tag = config.last_homeassistant
+        if tag and await homeassistant.install(tag):
+            break
+        _LOGGER.warning("Error on setup HomeAssistant. Retry in 60.")
+        await asyncio.sleep(60, loop=loop)
+
+    # store version
+    _LOGGER.info("HomeAssistant docker now installed.")