The app is perfectly working on local but on heroku server it returns Application Error. I suspect the problem might be on Procfile, when I changed it to "web: gunicorn eventlet -w 1 app:app", from "web: gunicorn app:app" it stopped working, I'm new on socketIO and flask, I've tried everything I saw on the internet to put on Procfile that works with socketIO but nothing worked. Please if anyone knows why this is happening please help me.
This is my requirements.txt file:
bidict==0.22.0
brotlipy==0.7.0
certifi==2021.10.8
click==8.1.3
dnspython==2.2.1
eventlet==0.33.1
Flask==2.1.3
Flask-SocketIO==5.2.0
Flask-SQLAlchemy==2.5.1
Flask-WTF==1.0.1
gevent==21.12.0
gevent-websocket==0.10.1
greenlet==1.1.2
gunicorn==20.1.0
importlib-metadata==4.12.0
itsdangerous==2.1.2
Jinja2==3.1.2
MarkupSafe==2.1.1
psycopg2==2.9.3
pycosat==0.6.3
python-engineio==4.3.3
python-socketio==5.7.1
SQLAlchemy==1.4.39
Werkzeug==2.1.2
wincertstore==0.2
WTForms==3.0.1
zipp==3.8.1
zope.event==4.5.0
zope.interface==5.4.0
this is the heroku logs:
2022-08-05T15:16:18.022704 00:00 app[web.1]:
2022-08-05T15:16:18.022716 00:00 app[web.1]: Error: class uri 'eventlet' invalid or not found:
2022-08-05T15:16:18.022716 00:00 app[web.1]:
2022-08-05T15:16:18.022717 00:00 app[web.1]: [Traceback (most recent call last):
2022-08-05T15:16:18.022717 00:00 app[web.1]: File "/app/.heroku/python/lib/python3.10/site-packages/gunicorn/util.py", line 99, in load_class
2022-08-05T15:16:18.022718 00:00 app[web.1]: mod = importlib.import_module('.'.join(components))
2022-08-05T15:16:18.022718 00:00 app[web.1]: File "/app/.heroku/python/lib/python3.10/importlib/__init__.py", line 126, in import_module
2022-08-05T15:16:18.022718 00:00 app[web.1]: return _bootstrap._gcd_import(name[level:], package, level)
2022-08-05T15:16:18.022719 00:00 app[web.1]: File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
2022-08-05T15:16:18.022719 00:00 app[web.1]: File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
2022-08-05T15:16:18.022720 00:00 app[web.1]: File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
2022-08-05T15:16:18.022720 00:00 app[web.1]: File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
2022-08-05T15:16:18.022720 00:00 app[web.1]: File "<frozen importlib._bootstrap_external>", line 883, in exec_module
2022-08-05T15:16:18.022721 00:00 app[web.1]: File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
2022-08-05T15:16:18.022721 00:00 app[web.1]: File "/app/.heroku/python/lib/python3.10/site-packages/gunicorn/workers/geventlet.py", line 20, in <module>
2022-08-05T15:16:18.022721 00:00 app[web.1]: from eventlet.wsgi import ALREADY_HANDLED as EVENTLET_ALREADY_HANDLED
2022-08-05T15:16:18.022722 00:00 app[web.1]: ImportError: cannot import name 'ALREADY_HANDLED' from 'eventlet.wsgi' (/app/.heroku/python/lib/python3.10/site-packages/eventlet/wsgi.py)
2022-08-05T15:16:18.022722 00:00 app[web.1]: ]
2022-08-05T15:16:18.022722 00:00 app[web.1]:
2022-08-05T15:16:18.246442 00:00 heroku[web.1]: Process exited with status 1
2022-08-05T15:16:18.357952 00:00 heroku[web.1]: State changed from starting to crashed
2022-08-05T15:16:18.374380 00:00 heroku[web.1]: State changed from crashed to starting
2022-08-05T15:16:23.365045 00:00 heroku[web.1]: Starting process with command `gunicorn -k eventlet -w 1 app:app`
2022-08-05T15:16:24.399378 00:00 app[web.1]:
2022-08-05T15:16:24.399392 00:00 app[web.1]: Error: class uri 'eventlet' invalid or not found:
2022-08-05T15:16:24.399392 00:00 app[web.1]:
2022-08-05T15:16:24.399393 00:00 app[web.1]: [Traceback (most recent call last):
2022-08-05T15:16:24.399393 00:00 app[web.1]: File "/app/.heroku/python/lib/python3.10/site-packages/gunicorn/util.py", line 99, in load_class
2022-08-05T15:16:24.399393 00:00 app[web.1]: mod = importlib.import_module('.'.join(components))
2022-08-05T15:16:24.399394 00:00 app[web.1]: File "/app/.heroku/python/lib/python3.10/importlib/__init__.py", line 126, in import_module
2022-08-05T15:16:24.399394 00:00 app[web.1]: return _bootstrap._gcd_import(name[level:], package, level)
2022-08-05T15:16:24.399394 00:00 app[web.1]: File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
2022-08-05T15:16:24.399395 00:00 app[web.1]: File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
2022-08-05T15:16:24.399395 00:00 app[web.1]: File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
2022-08-05T15:16:24.399395 00:00 app[web.1]: File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
2022-08-05T15:16:24.399396 00:00 app[web.1]: File "<frozen importlib._bootstrap_external>", line 883, in exec_module
2022-08-05T15:16:24.399396 00:00 app[web.1]: File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
2022-08-05T15:16:24.399396 00:00 app[web.1]: File "/app/.heroku/python/lib/python3.10/site-packages/gunicorn/workers/geventlet.py", line 20, in <module>
2022-08-05T15:16:24.399397 00:00 app[web.1]: from eventlet.wsgi import ALREADY_HANDLED as EVENTLET_ALREADY_HANDLED
2022-08-05T15:16:24.399397 00:00 app[web.1]: ImportError: cannot import name 'ALREADY_HANDLED' from 'eventlet.wsgi' (/app/.heroku/python/lib/python3.10/site-packages/eventlet/wsgi.py)
2022-08-05T15:16:24.399398 00:00 app[web.1]: ]
2022-08-05T15:16:24.399402 00:00 app[web.1]:
2022-08-05T15:16:24.550505 00:00 heroku[web.1]: Process exited with status 1
2022-08-05T15:16:24.671364 00:00 heroku[web.1]: State changed from starting to crashed
2022-08-05T15:31:37.077623 00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/session" host=cheesecake142.herokuapp.com request_id=95dbcb95-8af7-42d6-8979-10d78af79447 fwd="120.29.69.149" dyno= connect= service= status=503 bytes= protocol=https
2022-08-05T15:31:37.460979 00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=cheesecake142.herokuapp.com request_id=0ca459b8-538a-47f9-a4b4-296e21540db8 fwd="120.29.69.149" dyno= connect=
service= status=503 bytes= protocol=https
I'm willing to provide additional details about this problem if needed.
CodePudding user response：
Try this:
pip install gunicorn==20.1.0 eventlet==0.30.2
CodePudding user response：
So I had this exact issue myself just now, what worked for me in terms of getting rid of errors related to eventlet was specifying the python version (apparently python 3.2.0 is incompatible with the downgraded eventlet version, read eventlet issue 687). I still have other issues but they're unrelated so this might work for you:
- create a runtime.txt file in root directory
- in the file add
python-3.9.13
- in the file add
Just to clarify my package versions:
bidict==0.22.0
CacheControl==0.12.11
cachetools==5.2.0
certifi==2022.6.15
cffi==1.15.1
charset-normalizer==2.1.0
click==8.1.3
colorama==0.4.5
dnspython==1.16.0
eventlet==0.30.2
firebase-admin==5.2.0
Flask==2.2.1
Flask-SocketIO==5.2.0
gevent==21.12.0
gevent-websocket==0.10.1
google-api-core==2.8.2
google-api-python-client==2.55.0
google-auth==2.10.0
google-auth-httplib2==0.1.0
google-cloud-core==2.3.2
google-cloud-firestore==2.6.0
google-cloud-storage==2.5.0
google-crc32c==1.3.0
google-resumable-media==2.3.3
googleapis-common-protos==1.56.4
greenlet==1.1.2
grpcio==1.47.0
grpcio-status==1.47.0
gunicorn==20.1.0
httplib2==0.20.4
idna==3.3
itsdangerous==2.1.2
Jinja2==3.1.2
MarkupSafe==2.1.1
msgpack==1.0.4
proto-plus==1.20.6
protobuf==3.20.1
pyasn1==0.4.8
pyasn1-modules==0.2.8
pycparser==2.21
pyparsing==3.0.9
python-decouple==3.6
python-dotenv==0.20.0
python-engineio==4.3.4
python-socketio==5.7.1
requests==2.28.1
rsa==4.9
six==1.16.0
uritemplate==4.1.1
urllib3==1.26.11
Werkzeug==2.2.1
zope.event==4.5.0
zope.interface==5.4.0
My Procfile:
web: gunicorn --worker-class eventlet -w 1 application:app
Hope this works!
Edit: Forgot to clarify that dnspython has to be 1.16.0, your error in regards to that is due to the version not being lower than 2.0.0 - i still however after downgrading that to 1.16.0 got different errors which went away with the solution above