http: Avoid tornado import before extension is loaded, group all handlers

mopidy/http/__init__.py

@@ -3,8 +3,6 @@ from __future__ import unicode_literals
 import logging
 import os
 
-import tornado.web
-
 import mopidy
 from mopidy import config as config_lib, exceptions, ext
 
@@ -42,13 +40,6 @@ class Extension(ext.Extension):
         registry.add('frontend', HttpFrontend)
 
 
-class StaticFileHandler(tornado.web.StaticFileHandler):
-    def set_extra_headers(self, path):
-        self.set_header('Cache-Control', 'no-cache')
-        self.set_header(
-            'X-Mopidy-Version', mopidy.__version__.encode('utf-8'))
-
-
 class Router(object):
     """
     HTTP router interface.
@@ -104,9 +95,11 @@ class Router(object):
         Must return a list of request handlers compatible with
         :class:`tornado.web.Application`.
         """
-
         if self.static_file_path is None:
             raise ValueError('Undefined static file path in %s' % self)
+
+        from mopidy.http.handlers import StaticFileHandler
+
         logger.info(
             'Serving HTTP extension %s at %s', type(self), self.get_root_url())
         return [

mopidy/http/actor.py

@@ -13,7 +13,7 @@ import tornado.websocket
 
 from mopidy import models, zeroconf
 from mopidy.core import CoreListener
-from mopidy.http import StaticFileHandler, handlers
+from mopidy.http import handlers
 
 
 logger = logging.getLogger(__name__)
@@ -54,7 +54,7 @@ class HttpFrontend(pykka.ThreadingActor, CoreListener):
         static_dir = self.config['http']['static_dir']
 
         # either default mopidy or user defined path to files
-        primary_dir = (r'/(.*)', StaticFileHandler, {
+        primary_dir = (r'/(.*)', handlers.StaticFileHandler, {
             'path': static_dir if static_dir else mopidy_dir,
             'default_filename': 'index.html'
         })
@@ -69,7 +69,7 @@ class HttpFrontend(pykka.ThreadingActor, CoreListener):
         routes.extend([
             (r'/mopidy/ws/?', handlers.WebSocketHandler, {'actor': self}),
             (r'/mopidy/rpc', handlers.JsonRpcHandler, {'actor': self}),
-            (r'/mopidy/(.*)', StaticFileHandler, {
+            (r'/mopidy/(.*)', handlers.StaticFileHandler, {
                 'path': mopidy_dir, 'default_filename': 'mopidy.html'
             }),
             primary_dir,

mopidy/http/handlers.py

@@ -115,3 +115,10 @@ class JsonRpcHandler(tornado.web.RequestHandler):
         self.set_header(
             'X-Mopidy-Version', mopidy.__version__.encode('utf-8'))
         self.set_header('Content-Type', 'application/json; utf-8')
+
+
+class StaticFileHandler(tornado.web.StaticFileHandler):
+    def set_extra_headers(self, path):
+        self.set_header('Cache-Control', 'no-cache')
+        self.set_header(
+            'X-Mopidy-Version', mopidy.__version__.encode('utf-8'))

tests/http/test_router.py

@@ -11,6 +11,7 @@ from tornado.web import Application
 
 import mopidy
 from mopidy import http
+from mopidy.http import handlers
 
 
 try:
@@ -51,11 +52,10 @@ class HttpRouterTest(unittest.TestCase):
     def test_default_router(self):
         router = TestRouter(self.config)
 
-        handlers = router.get_request_handlers()
-        (pattern, handler_class, kwargs) = handlers[0]
+        (pattern, handler_class, kwargs) = router.get_request_handlers()[0]
 
         self.assertEqual(pattern, r'/test/(.*)')
-        self.assertIs(handler_class, http.StaticFileHandler)
+        self.assertIs(handler_class, handlers.StaticFileHandler)
         self.assertEqual(
             kwargs['path'], os.path.join(os.path.dirname(__file__), 'static'))
 
@@ -74,7 +74,7 @@ class HttpRouterTest(unittest.TestCase):
 
 class StaticFileHandlerTest(AsyncHTTPTestCase):
     def get_app(self):
-        app = Application([(r'/(.*)', http.StaticFileHandler, {
+        app = Application([(r'/(.*)', handlers.StaticFileHandler, {
             'path': os.path.dirname(__file__),
             'default_filename': 'test_router.py'
         })])