Move HomeAssistantView to separate file. Convert http to async syntax. [skip ci] (#12982)

* Move HomeAssistantView to separate file. Convert http to async syntax.

* pylint

* websocket api

* update emulated_hue for async/await

* Lint

homeassistant/components/http/static.py

@@ -1,5 +1,5 @@
 """Static file handling for HTTP component."""
-import asyncio
+
 import re
 
 from aiohttp import hdrs
@@ -14,8 +14,7 @@ _FINGERPRINT = re.compile(r'^(.+)-[a-z0-9]{32}\.(\w+)$', re.IGNORECASE)
 class CachingStaticResource(StaticResource):
     """Static Resource handler that will add cache headers."""
 
-    @asyncio.coroutine
-    def _handle(self, request):
+    async def _handle(self, request):
         filename = URL(request.match_info['filename']).path
         try:
             # PyLint is wrong about resolve not being a member.
@@ -32,7 +31,7 @@ class CachingStaticResource(StaticResource):
             raise HTTPNotFound() from error
 
         if filepath.is_dir():
-            return (yield from super()._handle(request))
+            return await super()._handle(request)
         elif filepath.is_file():
             return CachingFileResponse(filepath, chunk_size=self._chunk_size)
         else:
@@ -49,26 +48,24 @@ class CachingFileResponse(FileResponse):
 
         orig_sendfile = self._sendfile
 
-        @asyncio.coroutine
-        def sendfile(request, fobj, count):
+        async def sendfile(request, fobj, count):
             """Sendfile that includes a cache header."""
             cache_time = 31 * 86400  # = 1 month
             self.headers[hdrs.CACHE_CONTROL] = "public, max-age={}".format(
                 cache_time)
 
-            yield from orig_sendfile(request, fobj, count)
+            await orig_sendfile(request, fobj, count)
 
         # Overwriting like this because __init__ can change implementation.
         self._sendfile = sendfile
 
 
 @middleware
-@asyncio.coroutine
-def staticresource_middleware(request, handler):
+async def staticresource_middleware(request, handler):
     """Middleware to strip out fingerprint from fingerprinted assets."""
     path = request.path
     if not path.startswith('/static/') and not path.startswith('/frontend'):
-        return (yield from handler(request))
+        return await handler(request)
 
     fingerprinted = _FINGERPRINT.match(request.match_info['filename'])
 
@@ -76,4 +73,4 @@ def staticresource_middleware(request, handler):
         request.match_info['filename'] = \
             '{}.{}'.format(*fingerprinted.groups())
 
-    return (yield from handler(request))
+    return await handler(request)