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watching changes raise "RuntimeError: Cannot close a running event loop" #170

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lilin3 opened this issue May 16, 2018 · 18 comments
Closed

watching changes raise "RuntimeError: Cannot close a running event loop" #170

lilin3 opened this issue May 16, 2018 · 18 comments
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state: needs info More information is needed to identify what has to be done for this issue/PR

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@lilin3
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lilin3 commented May 16, 2018 •
edited
Loading 

.5/site-packages/apscheduler/executors/pool.py': 1526305704.9472704, '/home/yonghu/wode/myproject/regpark/venv/lib/python3.5/site-packages/flask/cli.py': 1526302662.0420418, '/usr/lib/python3.5/xml/etree/ElementTree.py': 1511887847.0, '/home/yonghu/wode/myproject/regpark/app/models.py': 1526395437.9710488, '/usr/lib/python3.5/asyncio/sslproto.py': 1511887846.0, '/home/yonghu/wode/myproject/regpark/venv/lib/python3.5/site-packages/jinja2/nodes.py': 1526302664.0981076, '/home/yonghu/wode/myproject/regpark/venv/lib/python3.5/site-packages/sqlalchemy/connectors/__init__.py': 1524256070.0})
Traceback (most recent call last):
  File "/home/yonghu/wode/myproject/regpark/venv/lib/python3.5/site-packages/tornado/ioloop.py", line 1208, in _run
    return self.callback()
  File "/home/yonghu/wode/myproject/regpark/venv/lib/python3.5/site-packages/tornado/autoreload.py", line 182, in _reload_on_update
    _check_file(modify_times, path)
  File "/home/yonghu/wode/myproject/regpark/venv/lib/python3.5/site-packages/tornado/autoreload.py", line 197, in _check_file
    _reload()
  File "/home/yonghu/wode/myproject/regpark/venv/lib/python3.5/site-packages/tornado/autoreload.py", line 204, in _reload
    fn()
  File "/home/yonghu/wode/myproject/regpark/venv/lib/python3.5/site-packages/livereload/server.py", line 310, in <lambda>
    add_reload_hook(lambda: IOLoop.instance().close(all_fds=True))
  File "/home/yonghu/wode/myproject/regpark/venv/lib/python3.5/site-packages/tornado/platform/asyncio.py", line 65, in close
    self.asyncio_loop.close()
  File "/usr/lib/python3.5/asyncio/unix_events.py", line 56, in close
    super().close()
  File "/usr/lib/python3.5/asyncio/selector_events.py", line 94, in close
    raise RuntimeError("Cannot close a running event loop")
RuntimeError: Cannot close a running event loop

--------------------------------above is error, follow is code------------------------------------------

@manager.command
def dev():
    from livereload import Server
    live_server = Server(app.wsgi_app)
    live_server.watch('**/*.*')
    live_server.serve(open_url=False)

the project is copied from another ubuntu computer, and is running correctly in another computer, almost everything is same between two computers, thanks for help
@AlJohri
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AlJohri commented May 21, 2018

ahhh, yes - I'm getting the same thing but it used to work perfectly fine before

    Traceback (most recent call last):
      File "/Users/johria/.local/share/virtualenvs/stories-f587eckA/lib/python3.6/site-packages/tornado/ioloop.py", line 1208, in _run
        return self.callback()
      File "/Users/johria/.local/share/virtualenvs/stories-f587eckA/lib/python3.6/site-packages/tornado/autoreload.py", line 182, in _reload_on_update
        _check_file(modify_times, path)
      File "/Users/johria/.local/share/virtualenvs/stories-f587eckA/lib/python3.6/site-packages/tornado/autoreload.py", line 197, in _check_file
        _reload()
      File "/Users/johria/.local/share/virtualenvs/stories-f587eckA/lib/python3.6/site-packages/tornado/autoreload.py", line 204, in _reload
        fn()
      File "/Users/johria/.local/share/virtualenvs/stories-f587eckA/lib/python3.6/site-packages/livereload/server.py", line 310, in <lambda>
        add_reload_hook(lambda: IOLoop.instance().close(all_fds=True))
      File "/Users/johria/.local/share/virtualenvs/stories-f587eckA/lib/python3.6/site-packages/tornado/platform/asyncio.py", line 65, in close
        self.asyncio_loop.close()
      File "/Users/johria/.pyenv/versions/3.6.3/lib/python3.6/asyncio/unix_events.py", line 63, in close
        super().close()
      File "/Users/johria/.pyenv/versions/3.6.3/lib/python3.6/asyncio/selector_events.py", line 107, in close
        raise RuntimeError("Cannot close a running event loop")
    RuntimeError: Cannot close a running event loop

see this related issue: tornadoweb/tornado#1543

@AlJohri
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AlJohri commented May 21, 2018

@lilin3 downgrading to 2.5.1 fixes the issue for me. @lepture looks like some regression in the latest release?

@AlJohri
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AlJohri commented May 21, 2018

this seems like the PR that tries to close the event loop: #157

cc @wewearglasses

@cmbasnett
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Reverting to 2.5.1 fixed this for me while trying to run a Flask server with livereload.

@cmbasnett cmbasnett mentioned this issue Jan 2, 2019
Closed
@spanezz spanezz mentioned this issue Dec 16, 2019
Closed
@pradyunsg
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Collaborator

Is this still an issue?

@pradyunsg pradyunsg added the state: needs info More information is needed to identify what has to be done for this issue/PR label Sep 18, 2020
@MythreyaK
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MythreyaK commented Nov 25, 2020 •
edited
Loading

Having the same issue, livereload version 2.6.3 with Python 3.9.0 on Windows 10 2004 (build 19041)

Reverting to 2.5.1 fixed this for me while trying to run a Flask server with livereload.

Can confirm, works on this version. Didn't try other versions (apart from the latest 2.6.3, which crashes).

Logs

Output of pip freeze 
alembic==1.4.3
astroid==2.4.2
click==7.1.2
colorama==0.4.4
Flask==1.1.2
Flask-Migrate==2.5.3
Flask-SQLAlchemy==2.4.4
isort==5.6.4
itsdangerous==1.1.0
Jinja2==2.11.2
lazy-object-proxy==1.4.3
livereload==2.6.3
Mako==1.1.3
MarkupSafe==1.1.1
mccabe==0.6.1
pylint==2.6.0
python-dateutil==2.8.1
python-editor==1.0.4
six==1.15.0
SQLAlchemy==1.3.20
toml==0.10.2
tornado==6.1
Werkzeug==1.0.1
wrapt==1.12.1
Open Log (Warning, it's pretty big!) 
[I 201126 00:27:15 server:335] Serving on http://127.0.0.1:5500
[I 201126 00:27:15 handlers:62] Start watching changes
[I 201126 00:27:15 handlers:64] Start detecting changes
[I 201126 00:27:20 handlers:135] Browser Connected: http://localhost:5500/hello/
[E 201126 00:27:21 ioloop:907] Exception in callback functools.partial(<function _reload_on_update at 0x000002BAED0633A0>, {'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\importlib\\_bootstrap.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\importlib\\_bootstrap_external.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\codecs.py': 
1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\encodings\\aliases.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\encodings\\__init__.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\encodings\\utf_8.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\encodings\\cp1252.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\encodings\\latin_1.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\abc.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\io.py': 1601893002.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\run.py': 1606330600.32169, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\stat.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\_collections_abc.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\genericpath.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\ntpath.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\os.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\_sitebuiltins.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\site.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\types.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\enum.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\sre_constants.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\sre_parse.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\sre_compile.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\heapq.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\keyword.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\operator.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\reprlib.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\collections\\__init__.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\functools.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\copyreg.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\re.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\string.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\collections\\abc.py': 1601893002.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\markupsafe\\_compat.py': 1550949133.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\markupsafe\\_speedups.cp39-win_amd64.pyd': 1606048723.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\markupsafe\\__init__.py': 1550961247.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\posixpath.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\fnmatch.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\warnings.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\_compression.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\_weakrefset.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\threading.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\DLLs\\_bz2.pyd': 1601893020.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\bz2.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\DLLs\\_lzma.pyd': 1601893020.0, 
'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\lzma.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\shutil.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\bisect.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\random.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\weakref.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\tempfile.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\DLLs\\_hashlib.pyd': 1601893020.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\hashlib.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\struct.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\_compat_pickle.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\pickle.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\urllib\\__init__.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\urllib\\parse.py': 1601893002.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\_compat.py': 1606048723.8490381, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\json\\scanner.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\json\\decoder.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\json\\encoder.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\json\\__init__.py': 1601893002.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\utils.py': 1606048724.0822413, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\bccache.py': 1606048723.9040363, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\nodes.py': 1606048724.0319867, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\exceptions.py': 1606048723.9619753, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\visitor.py': 1606048724.0970745, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\idtracking.py': 1606048723.992532, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\optimizer.py': 1606048724.0389159, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\__future__.py': 1601893002.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\compiler.py': 1606048723.9160376, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\runtime.py': 1606048724.0519893, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\filters.py': 1606048723.9835317, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\numbers.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\DLLs\\_decimal.pyd': 1601893020.0, 
'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\decimal.py': 1601893002.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\tests.py': 1606048724.0721319, 'C:\\Users\\user\\Projects\\Visual 
Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\defaults.py': 1606048723.9468837, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\contextlib.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\ast.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\DLLs\\unicodedata.pyd': 1601893022.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\_identifier.py': 1606048723.860036, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\lexer.py': 1606048723.9967582, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\parser.py': 1606048724.046975, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\environment.py': 1606048723.9569619, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\loaders.py': 1606048724.006873, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\__init__.py': 1606048723.8380373, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\signal.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\DLLs\\_socket.pyd': 1601893020.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\DLLs\\select.pyd': 1601893020.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\selectors.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\socket.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\datetime.py': 1601893002.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\werkzeug\\_compat.py': 1606048719.4119387, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\opcode.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\dis.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\importlib\\__init__.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\importlib\\machinery.py': 
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1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\tasks.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\staggered.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\trsock.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\base_events.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\runners.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\queues.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\streams.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\subprocess.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\threads.py': 
1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\DLLs\\_overlapped.pyd': 1601893020.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\base_subprocess.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\proactor_events.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\selector_events.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\windows_utils.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\windows_events.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\asyncio\\__init__.py': 1601893002.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\concurrent.py': 1606159264.9180398, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\ioloop.py': 1606159265.0020406, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\multiprocessing\\process.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\multiprocessing\\reduction.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\multiprocessing\\context.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\multiprocessing\\__init__.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\stringprep.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\encodings\\idna.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\concurrent\\futures\\thread.py': 1601893002.0, 
'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\netutil.py': 1606159265.0627842, 'C:\\Users\\user\\Projects\\Visual Studio 
Code\\project\\venv\\lib\\site-packages\\tornado\\iostream.py': 1606159265.0180438, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\process.py': 1606159265.080374, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\autoreload.py': 1606159264.9060652, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\gzip.py': 1601893002.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\gen.py': 1606159264.9540267, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\http1connection.py': 1606159264.9620407, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\tcpserver.py': 1606159265.1406548, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\httpserver.py': 1606159264.9860413, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\csv.py': 1601893002.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\_locale_data.py': 1606159264.880488, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\locale.py': 1606159265.0260494, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\template.py': 1606159265.1545596, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\routing.py': 1606159265.0945954, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\web.py': 1606159265.1861134, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\httpclient.py': 1606159264.9700387, 
'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\tcpclient.py': 1606159265.1326585, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\simple_httpclient.py': 1606159265.1105783, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\locks.py': 1606159265.0420434, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\queues.py': 1606159265.0859964, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\websocket.py': 1606159265.2022247, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\livereload\\handlers.py': 1598109370.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\glob.py': 1601893002.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\livereload\\watcher.py': 1598109370.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\livereload\\server.py': 1598109370.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\livereload\\__init__.py': 1598109552.0, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\jinja2\\ext.py': 1606048723.9745305, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\platform\\__init__.py': 1606159265.224183, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\tornado\\platform\\asyncio.py': 1606159265.2251835, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\sqlalchemy\\dialects\\sqlite\\json.py': 1606050837.0201685, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\sqlalchemy\\dialects\\sqlite\\base.py': 1606050837.0091658, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\sqlalchemy\\dialects\\sqlite\\pysqlite.py': 1606050837.045194, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\sqlalchemy\\dialects\\sqlite\\pysqlcipher.py': 1606050837.0363035, 'C:\\Users\\user\\Projects\\Visual Studio Code\\project\\venv\\lib\\site-packages\\sqlalchemy\\dialects\\sqlite\\__init__.py': 1606050837.0021682, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\DLLs\\_sqlite3.pyd': 1601893020.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\sqlite3\\dbapi2.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\sqlite3\\__init__.py': 1601893002.0, 'C:\\Users\\user\\AppData\\Local\\Programs\\Python\\Python39\\lib\\encodings\\unicode_escape.py': 1601893002.0})
    Traceback (most recent call last):
      File "C:\Users\user\Projects\Visual Studio Code\project\venv\lib\site-packages\tornado\ioloop.py", line 905, in _run
        return self.callback()
      File "C:\Users\user\Projects\Visual Studio Code\project\venv\lib\site-packages\tornado\autoreload.py", line 187, in _reload_on_update
        _check_file(modify_times, path)
      File "C:\Users\user\Projects\Visual Studio Code\project\venv\lib\site-packages\tornado\autoreload.py", line 202, in _check_file
        _reload()
      File "C:\Users\user\Projects\Visual Studio Code\project\venv\lib\site-packages\tornado\autoreload.py", line 209, in _reload
        fn()
      File "C:\Users\user\Projects\Visual Studio Code\project\venv\lib\site-packages\livereload\server.py", line 355, in <lambda>
        add_reload_hook(lambda: IOLoop.instance().close(all_fds=True))
      File "C:\Users\user\Projects\Visual Studio Code\project\venv\lib\site-packages\tornado\platform\asyncio.py", line 140, in close
        self.asyncio_loop.close()
      File "C:\Users\user\AppData\Local\Programs\Python\Python39\lib\asyncio\selector_events.py", line 89, in close
        raise RuntimeError("Cannot close a running event loop")
    RuntimeError: Cannot close a running event loop

@frozenpandaman
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This seem to still be an issue. Any resolution?

@ndkv
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ndkv commented Sep 24, 2021 •
edited
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I dug into this issue yesterday a little and can confirm that @AlJohri is correct: 26b1d85 is indeed the cause.

I'm not a Tornado or event loops in general expert but the docs state that

An IOLoop must be completely stopped before it can be closed. This means that IOLoop.stop() must be called and IOLoop.start() must be allowed to return before attempting to call IOLoop.close().

I tried calling IOLoop.instance().stop() before calling close() in the callback as a variation of

def close_loop():
    IOLoop.instance().stop()
    IOLoop.instance().close(all_fds=True)

add_reload_hook(close_loop)
IOLoop.instance().start()

but that didn't work as close_loop (and therefore close()) is called before IOLoop.instance().start() can return which raises a RuntimeError as well.

Removing IOLoop.instance().close(all_fds=True) seems to work fine: Tornado restarts without errors, the browser reconnects and starts reacting to file changes. I don't experience/notice the "browser limbo in pending state" 26b1d85 was supposed to fix.

I'm not sure whether this leaves dangling IOLoop instances and/or results in memory leaks, though.

@quietcricket
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Contributor

Hi @ndkv , if you are using python 3, the reload hook is not needed. I added that line of code in the paste when I was using python 2.

@ndkv
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ndkv commented Sep 27, 2021

Yes, I'm on Python 3.

Do you know if it is still needed for Python 2?

Can we somehow fix this issue for Python 2 and 3?

@stefanrows
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I can confirm that this is still an issue for me as well. Just freshly installed livereload for my Django project and am getting the same error.

@caph1993
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caph1993 commented Nov 6, 2021

It is also affecting me on a Flask project.

@EpicCodeWizard
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Versions 2.5.2+ have this issue. Downgrade to version 2.5.1 (pip install livereload==2.5.1).

@ryanlinnane
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I dug into this issue yesterday a little and can confirm that @AlJohri is correct: 26b1d85 is indeed the cause.

I'm not a Tornado or event loops in general expert but the docs state that

An IOLoop must be completely stopped before it can be closed. This means that IOLoop.stop() must be called and IOLoop.start() must be allowed to return before attempting to call IOLoop.close().

I tried calling IOLoop.instance().stop() before calling close() in the callback as a variation of

def close_loop():
    IOLoop.instance().stop()
    IOLoop.instance().close(all_fds=True)

add_reload_hook(close_loop)
IOLoop.instance().start()

but that didn't work as close_loop (and therefore close()) is called before IOLoop.instance().start() can return which raises a RuntimeError as well.

Removing IOLoop.instance().close(all_fds=True) seems to work fine: Tornado restarts without errors, the browser reconnects and starts reacting to file changes. I don't experience/notice the "browser limbo in pending state" 26b1d85 was supposed to fix.

I'm not sure whether this leaves dangling IOLoop instances and/or results in memory leaks, though.

Latest still has this issue. Haven't had a chance to dig deep but this worked for me.

@nilslindemann
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Versions 2.5.2+ have this issue. Downgrade to version 2.5.1 (pip install livereload==2.5.1).

It indeed does not show the error, but it also does not reload the browser tab.

kkostov added a commit to kkostov/python-livereload that referenced this issue Jun 29, 2024
@kkostov
fix(lepture#170): wait for the IOLoop to be stopped before attempting…
5453629 
… to close it.
@kkostov kkostov mentioned this issue Jun 29, 2024
Merged
lepture added a commit that referenced this issue Oct 4, 2024
@lepture
Merge pull request #276 from kkostov/fix-event-loop-error
96fb2e1 
fix(#170): wait for the IOLoop to stop before attempting to close it
@davidparsson
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I think this can be closed, since #276 has been merged. 🥳 Now we just need a release.

@susodapop
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+1 that #276 fixes this for me whereas when using livereload==2.7.0 I saw the same error as OP.

I updated my project to use the tip of master:

# pyproject.toml
livereload = { git = "https://github.com/lepture/python-livereload.git", branch = "master" }

And livereload now functions as expected. My development script:

from app import app 
from livereload import Server

app.debug = True
server = Server(app.wsgi_app)

if __name__ == "__main__":
    server.watch("app/static/dist/styles.css") # this is changed by tailwind compiler
    server.serve()

@davidparsson
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2.7.1 is now released, containing #276. 🥳

@lepture lepture closed this as completed Jan 15, 2025
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