no support for latest version of tornado

[twobraids]

Importing webthing fails:

(py37) $ pip install webthing
Collecting webthing
  Using cached https://files.pythonhosted.org/packages/bf/46/b8460dd86abfd59d181697ede692797edffa79df262485717ed33d0e4d3d/webthing-0.11.1-py3-none-any.whl
Requirement already satisfied: jsonschema in /home/lars/project/lars_iot/py37/lib/python3.7/site-packages (from webthing) (3.0.1)
Requirement already satisfied: netifaces in /home/lars/project/lars_iot/py37/lib/python3.7/site-packages (from webthing) (0.10.9)
Requirement already satisfied: pyee in /home/lars/project/lars_iot/py37/lib/python3.7/site-packages (from webthing) (5.0.0)
Requirement already satisfied: tornado in /home/lars/project/lars_iot/py37/lib/python3.7/site-packages (from webthing) (6.0.1)
Requirement already satisfied: zeroconf in /home/lars/project/lars_iot/py37/lib/python3.7/site-packages (from webthing) (0.21.3)
Requirement already satisfied: pyrsistent>=0.14.0 in /home/lars/project/lars_iot/py37/lib/python3.7/site-packages (from jsonschema->webthing) (0.14.11)
Requirement already satisfied: six>=1.11.0 in /home/lars/project/lars_iot/py37/lib/python3.7/site-packages (from jsonschema->webthing) (1.12.0)
Requirement already satisfied: setuptools in /home/lars/project/lars_iot/py37/lib/python3.7/site-packages (from jsonschema->webthing) (40.6.2)
Requirement already satisfied: attrs>=17.4.0 in /home/lars/project/lars_iot/py37/lib/python3.7/site-packages (from jsonschema->webthing) (19.1.0)
Requirement already satisfied: ifaddr in /home/lars/project/lars_iot/py37/lib/python3.7/site-packages (from zeroconf->webthing) (0.1.6)
Installing collected packages: webthing
Successfully installed webthing-0.11.1
(py37) $ python
Python 3.7.2 (default, Feb 25 2019, 16:59:29) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import webthing
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/lars/project/lars_iot/py37/lib/python3.7/site-packages/webthing/__init__.py", line 7, in <module>
    from .server import MultipleThings, SingleThing, WebThingServer
  File "/home/lars/project/lars_iot/py37/lib/python3.7/site-packages/webthing/server.py", line 152, in <module>
    class ThingHandler(tornado.websocket.WebSocketHandler):
  File "/home/lars/project/lars_iot/py37/lib/python3.7/site-packages/webthing/server.py", line 191, in ThingHandler
    @tornado.web.asynchronous
AttributeError: module 'tornado.web' has no attribute 'asynchronous'
>>> 

[twobraids]

The requirements.txt file for webthing specifies tornado>=5.1.0. Unfortunately, Version 6 of tornado was released on March 1, 2019 and it has breaking changes. Likely this could be resolved by either pinning the webthing to 5.1.0 or adjusting the code to work with tornado 6.0.1. Unfortunately, I cannot get the former to work and haven't had the chance to try the latter.

The tornado 6.0.0 release notes (https://www.tornadoweb.org/en/stable/releases/v6.0.0.html) documents the removal of the asynchronous decorator, but makes no suggestion as to how to proceed without it.