Require tornado >= 4.4

.travis.yml

@@ -8,12 +8,10 @@ python:
 
 env:
   - TOX_ENV=py27
-  - TOX_ENV=py27-tornado32
   - TOX_ENV=docs
   - TOX_ENV=flake8
 
 before_install:
-  - "sudo sed -i '/127.0.1.1/d' /etc/hosts"  # Workaround tornadoweb/tornado#1573
   - "sudo apt-get update -qq"
   - "sudo apt-get install -y gir1.2-gst-plugins-base-1.0 gir1.2-gstreamer-1.0 graphviz-dev gstreamer1.0-plugins-good gstreamer1.0-plugins-bad python-gst-1.0"
 

docs/changelog.rst

@@ -5,10 +5,14 @@ Changelog
 This changelog is used to track all major changes to Mopidy.
 
 
-v2.1.1 (UNRELEASED)
+v2.2.0 (UNRELEASED)
 ===================
 
-Bug fix release.
+Feature release.
+
+- Dependencies: Drop support for Tornado < 4.4. Though strictly a breaking
+  change, this shouldn't affect any supported systems as even Debian stable
+  includes Tornado >= 4.4.
 
 - MPD: Added ``idle`` to the list of available commands.
   (Fixes: :issue:`1593`, PR: :issue:`1597`)

mopidy/http/handlers.py

@@ -3,7 +3,6 @@ from __future__ import absolute_import, unicode_literals
 import functools
 import logging
 import os
-import socket
 
 import tornado.escape
 import tornado.ioloop
@@ -101,12 +100,7 @@ class WebSocketHandler(tornado.websocket.WebSocketHandler):
         self.jsonrpc = make_jsonrpc_wrapper(core)
 
     def open(self):
-        if hasattr(self, 'set_nodelay'):
-            # New in Tornado 3.1
-            self.set_nodelay(True)
-        else:
-            self.stream.socket.setsockopt(
-                socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
+        self.set_nodelay(True)
         self.clients.add(self)
         logger.debug(
             'New WebSocket connection from %s', self.request.remote_ip)

setup.py

@@ -28,7 +28,7 @@ setup(
         'Pykka >= 1.1',
         'requests >= 2.0',
         'setuptools',
-        'tornado >= 3.2, < 5',  # Tornado 5 requires Python >= 2.7.9
+        'tornado >= 4.4, < 5',  # Tornado 5 requires Python >= 2.7.9
     ],
     extras_require={'http': []},
     entry_points={

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27, py27-tornado32, docs, flake8
+envlist = py27, docs, flake8
 
 [testenv]
 sitepackages = true
@@ -17,12 +17,6 @@ deps =
     pytest-xdist
     responses
 
-[testenv:py27-tornado32]
-commands = pytest tests/http
-deps =
-    {[testenv]deps}
-    tornado==3.2.2
-
 [testenv:docs]
 deps = -r{toxinidir}/docs/requirements.txt
 changedir = docs