drop tornado<5 in setup.py, tox.ini

 - flake8 clean-up
 - example3 fixed
 - add unreleased changelog in doc

circus/client.py

@@ -67,6 +67,7 @@ def call(self, cmd):
 
         try:
             future = concurrent.Future()
+
             def cb(msg, status):
                 future.set_result(msg)
             self.stream.send(cmd, callback=cb)

circus/tests/support.py

@@ -473,6 +473,7 @@ def is_alive(self):
     def stop(self):
         pass
 
+
 class MagicMockFuture(mock.MagicMock, concurrent.futures.Future):
 
     def cancel(self):

circus/tests/test_arbiter.py

@@ -500,6 +500,7 @@ def test_plugins(self):
                                  loop=get_ioloop())
 
         def incr_processes(cli):
+            # return a coroutine if cli is Async
             return cli.send_message('incr', name='test')
 
         # wait for the plugin to be started
@@ -511,7 +512,6 @@ def incr_processes(cli):
         res = yield cli.send_message('list', name='test')
         self.assertEqual(len(res.get('pids')), 1)
 
-        # XXX: NOT SURE, yield make procedure sync
         yield incr_processes(cli)
         res = yield cli.send_message('list', name='test')
         self.assertEqual(len(res.get('pids')), 2)

docs/source/changelog.rst

@@ -4,6 +4,7 @@ Changelog history
 unreleased
 ----------
 
+- Drop support for tornado<5 and start using asyncio eventl loop - #1129
 - Fix mem_info readings to be more reliable - #1128
 - Drop support for Python 2.7 & 3.4 - #1126
 - Speedup reloadconfig for large number of sockets - #1121

examples/test.sh

@@ -1,2 +1,3 @@
 #!/bin/sh
-;sleep 1
+sleep 1
+echo "@@@"

setup.py

@@ -6,7 +6,7 @@
     raise SystemExit("Circus requires Python 3.5 or higher.")
 
 
-install_requires = ['psutil', 'pyzmq>=17.0', 'tornado>=3.0,<5.0']
+install_requires = ['psutil', 'pyzmq>=17.0', 'tornado>=5.0.2']
 
 try:
     import argparse     # NOQA
@@ -46,7 +46,6 @@
             'gevent',
             'papa',
             'PyYAML',
-            'tornado>=3.0,<5.0',
             'pyzmq>=17.0',
             'flake8==2.1.0',
         ],

tox.ini

@@ -12,7 +12,7 @@ deps =
     gevent
     papa
     PyYAML
-    tornado>=3.0,<5.0
+    tornado>=5.0.2
     pyzmq>=17.0
 
 setenv =