Error cannot import name 'json' from 'itsdangerous'

[frossi-git]

A fresh test installation of iris logs the following error, after creating a VM instance that should be tagged:

ImportError: cannot import name 'json' from 'itsdangerous' (/layers/google.python.pip/pip/lib/python3.8/site-packages/itsdangerous/__init__.py)

at .<module> ( [/layers/google.python.pip/pip/lib/python3.8/site-packages/flask/json/__init__.py:15](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Flayers%2Fgoogle.python.pip%2Fpip%2Flib%2Fpython3.8%2Fsite-packages%2Fflask%2Fjson%2F__init__.py&line=15&project=iris-test-xxxxxx) )
at .<module> ( [/layers/google.python.pip/pip/lib/python3.8/site-packages/flask/__init__.py:19](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Flayers%2Fgoogle.python.pip%2Fpip%2Flib%2Fpython3.8%2Fsite-packages%2Fflask%2F__init__.py&line=19&project=iris-test-xxxxxx) )
at .<module> ( [/srv/main.py:11](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Fsrv%2Fmain.py&line=11&project=iris-test-xxxxxx) )
at ._call_with_frames_removed ( [<frozen importlib._bootstrap>:219](https://console.cloud.google.com/debug?referrer=fromlog&file=%3Cfrozen%20importlib._bootstrap%3E&line=219&project=iris-test-xxxxxx) )
at .exec_module ( [<frozen importlib._bootstrap_external>:843](https://console.cloud.google.com/debug?referrer=fromlog&file=%3Cfrozen%20importlib._bootstrap_external%3E&line=843&project=iris-test-xxxxxx) )
at ._load_unlocked ( [<frozen importlib._bootstrap>:671](https://console.cloud.google.com/debug?referrer=fromlog&file=%3Cfrozen%20importlib._bootstrap%3E&line=671&project=iris-test-xxxxxx) )
at ._find_and_load_unlocked ( [<frozen importlib._bootstrap>:975](https://console.cloud.google.com/debug?referrer=fromlog&file=%3Cfrozen%20importlib._bootstrap%3E&line=975&project=iris-test-xxxxxx) )
at ._find_and_load ( [<frozen importlib._bootstrap>:991](https://console.cloud.google.com/debug?referrer=fromlog&file=%3Cfrozen%20importlib._bootstrap%3E&line=991&project=iris-test-xxxxxx) )
at ._gcd_import ( [<frozen importlib._bootstrap>:1014](https://console.cloud.google.com/debug?referrer=fromlog&file=%3Cfrozen%20importlib._bootstrap%3E&line=1014&project=iris-test-xxxxxx) )
at .import_module ( [/opt/python3.8/lib/python3.8/importlib/__init__.py:127](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Fopt%2Fpython3.8%2Flib%2Fpython3.8%2Fimportlib%2F__init__.py&line=127&project=iris-test-xxxxxx) )
at .import_app ( [/layers/google.python.pip/pip/lib/python3.8/site-packages/gunicorn/util.py:359](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Flayers%2Fgoogle.python.pip%2Fpip%2Flib%2Fpython3.8%2Fsite-packages%2Fgunicorn%2Futil.py&line=359&project=iris-test-xxxxxx) )
at .load_wsgiapp ( [/layers/google.python.pip/pip/lib/python3.8/site-packages/gunicorn/app/wsgiapp.py:48](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Flayers%2Fgoogle.python.pip%2Fpip%2Flib%2Fpython3.8%2Fsite-packages%2Fgunicorn%2Fapp%2Fwsgiapp.py&line=48&project=iris-test-xxxxxx) )
at .load ( [/layers/google.python.pip/pip/lib/python3.8/site-packages/gunicorn/app/wsgiapp.py:58](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Flayers%2Fgoogle.python.pip%2Fpip%2Flib%2Fpython3.8%2Fsite-packages%2Fgunicorn%2Fapp%2Fwsgiapp.py&line=58&project=iris-test-xxxxxx) )
at .wsgi ( [/layers/google.python.pip/pip/lib/python3.8/site-packages/gunicorn/app/base.py:67](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Flayers%2Fgoogle.python.pip%2Fpip%2Flib%2Fpython3.8%2Fsite-packages%2Fgunicorn%2Fapp%2Fbase.py&line=67&project=iris-test-xxxxxx) )
at .load_wsgi ( [/layers/google.python.pip/pip/lib/python3.8/site-packages/gunicorn/workers/base.py:146](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Flayers%2Fgoogle.python.pip%2Fpip%2Flib%2Fpython3.8%2Fsite-packages%2Fgunicorn%2Fworkers%2Fbase.py&line=146&project=iris-test-xxxxxx) )
at .init_process ( [/layers/google.python.pip/pip/lib/python3.8/site-packages/gunicorn/workers/base.py:134](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Flayers%2Fgoogle.python.pip%2Fpip%2Flib%2Fpython3.8%2Fsite-packages%2Fgunicorn%2Fworkers%2Fbase.py&line=134&project=iris-test-xxxxxx) )
at .init_process ( [/layers/google.python.pip/pip/lib/python3.8/site-packages/gunicorn/workers/gthread.py:92](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Flayers%2Fgoogle.python.pip%2Fpip%2Flib%2Fpython3.8%2Fsite-packages%2Fgunicorn%2Fworkers%2Fgthread.py&line=92&project=iris-test-xxxxxx) )
at .spawn_worker ( [/layers/google.python.pip/pip/lib/python3.8/site-packages/gunicorn/arbiter.py:589](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Flayers%2Fgoogle.python.pip%2Fpip%2Flib%2Fpython3.8%2Fsite-packages%2Fgunicorn%2Farbiter.py&line=589&project=iris-test-xxxxxx) )

Googling for the problem I found similar answers:
https://itsmycode.com/importerror-cannot-import-name-json-from-itsdangerous
https://stackoverflow.com/questions/71189819/python-docker-importerror-cannot-import-name-json-from-itsdangerous

I tried updating requirements.txt with:

Flask==1.1.4
markupsafe==2.0.1

but I had versions conflicts:

ERROR: Cannot install -r requirements.txt (line 1) and -r requirements.txt (line 9) because these package versions have conflicting dependencies.

The conflict is caused by:
    flask 1.1.4 depends on click<8.0 and >=5.1
    black 22.1.0 depends on click>=8.0.0

Then I tried updating to the latest Flask version:

Flask==2.0.3

This last attempt was successful, the application is deployed correctly and no more errors are logged.
VM instances are tagged correctly, but i haven't tested other services.

[JoshuaFox]

Thank you, Filippo! I'll work on that early next week. If you'd like to submit a PR, that would be great.

(This dependency change has been hitting a lot of projects recently, but the version update should do it.)

[frossi-git]

There you go! Thanks.

[JoshuaFox]

Fixed with merge as mentioned above