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flask_project_setup's Introduction

Hi there, I'm Leo

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Born in 1977, I started coding in April 1987 on a Sinclair ZX Spectrum. I then moved to MS-DOS PCs and in 1996 I started using Linux and became interested in operating system internals. I love architectures, algorithms, mathematics and cryptography. I currently work as an infrastructure engineer and Python developer.

From 2013 I blog some technical thoughts at The Digital Cat

In 2018 I published the free book "Clean Architectures in Python” that is available on Leanpub and online.

Open source projects:

Languages and Tools:

Linux Bash Python AWS Docker NGINX Terraform



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flask_project_setup's Issues

error because of the port number.

I appreciate for your amazing work.

I would like to explain the error which was already issued(#4) for you to catch up easily.

You can face the error the stage, 'Scenario example 1' in the 'Flask project set up Part3'

As far as I understand, the error is started from the line.

flask_project_setup/manage.py

Line 188 in 9d96015

cmdline = docker_compose_cmdline("up -d")

and, it counter the error in here because web service run the flask application.

flask_project_setup/application/config.py

Line 12 in 9d96015

port = os.environ["POSTGRES_PORT"]

when the web service container run, it needs port number for postgresql, but there is no information for port number at that time.

I'm looking forward to your reply
Again, huge thanks for your work.

flask.cli.NoAppException: Could not import "wsgi".

Hi,

Thanks for the great blog.
I am having trouble executing the part 1. After executing
"docker-compose -f docker/development.yml up -d", going to 0.0.0.0:5000, results in NoAppException.

Can you please let me know how to resolve this? Thanks in advance.

Regards,
Prabhakar

Scenario Up db connect broken

Line 211 in manage.py results in a connection to a container with no env variables set up. The container is built correctly but something strange happens with the current connection string. This is my work around, would love your thoughts. The tutorial is beautiful.

docker_output_json = subprocess.check_output(['docker','ps',"--format='{{ json .Names}}'"])

docker_startup_names = docker_output_json.decode('unicode_escape').split('"')

scenario_db_name = [ x for x in docker_startup_names if config and 'db' in x ][0]

cmdline = f"docker exec -it {scenario_db_name} psql -U {os.getenv('POSTGRES_USER')} -d {os.getenv('APPLICATION_DB')}"

Service `web` in scenario.yml starts before POSTGRES_PORT is set

Thanks for the great tutorial, it's super helpful.

I got the error below when running the first scenario, and looking at how the code in manage.py is structured:

cmdline = docker_compose_cmdline('up -d') starts both database and web services, before the port is set a few lines down
port = out.decode('utf-8').replace('\n', '').split(':')[1]
os.environ['POSTGRES_PORT'] = port

* Environment: development
 * Debug mode: on
Traceback (most recent call last):
  File "/usr/local/bin/flask", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.9/site-packages/flask/cli.py", line 990, in main
    cli.main(args=sys.argv[1:])
  File "/usr/local/lib/python3.9/site-packages/flask/cli.py", line 596, in main
    return super().main(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 1062, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 1668, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/click/decorators.py", line 84, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/click/core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/flask/cli.py", line 845, in run_command
    app = DispatchingApp(info.load_app, use_eager_loading=eager_loading)
  File "/usr/local/lib/python3.9/site-packages/flask/cli.py", line 321, in __init__
    self._load_unlocked()
  File "/usr/local/lib/python3.9/site-packages/flask/cli.py", line 346, in _load_unlocked
    self._app = rv = self.loader()
  File "/usr/local/lib/python3.9/site-packages/flask/cli.py", line 406, in load_app
    app = locate_app(self, import_name, None, raise_if_not_found=False)
  File "/usr/local/lib/python3.9/site-packages/flask/cli.py", line 256, in locate_app
    __import__(module_name)
  File "/opt/code/wsgi.py", line 5, in <module>
    app = create_app(os.environ['FLASK_CONFIG'])
  File "/opt/code/application/app.py", line 10, in create_app
    app.config.from_object(config_module)
  File "/usr/local/lib/python3.9/site-packages/flask/config.py", line 161, in from_object
    obj = import_string(obj)
  File "/usr/local/lib/python3.9/site-packages/werkzeug/utils.py", line 865, in import_string
    __import__(import_name)
  File "/opt/code/application/config.py", line 6, in <module>
    class Config(object):
  File "/opt/code/application/config.py", line 12, in Config
    port = os.environ['POSTGRES_PORT']
  File "/usr/local/lib/python3.9/os.py", line 679, in __getitem__
    raise KeyError(key) from None
KeyError: 'POSTGRES_PORT'

License question

Hi,

Wow, this is just what I was looking for! Thank you so much.

I would like to copy your code but I can't find the License, so I don't know if I can.

Could you point me in the right direction please?

Cheers!

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