egos-helpers 1.3.0

A python library for helper functions

egos-helpers

A python library for helper functions. Used in the egos-tech projects.

Functions

• gather_environ: Return a dict of environment variables correlating to the keys dict.
• get_environ_value: Resolve a single value from an environment variable or its _FILE companion (file-based secrets).
• short_msg: Truncates the message to chars characters and adds two dots at the end.
• strtobool: Converts a string to a boolean
• redact: Replaces in message the param string with replace_value

See egos_helpers/core.py for the full description of each function.

Usage example

Install egos-helpers:

python3 -m venv .venv
source .venv/bin/activate
# if you don't have a requirements.txt file
pip install -U egos-helpers
# if you do have a requirements.txt file
pip install -U -r requirements.txt

In your python project:

from egos_helpers import gather_environ

class MyClass:

    keys = {
        'key_one': {
            'default': ['one', 2],
            'type': "list",
        },
        'key_two':{
            'hidden': True,
            'default': False,
            'type': "boolean",
        },
        'key_three': {
            'default': [],
            'type': "filter",
        },
        'key_four': {
            'default': None,
            'redact': True,
            'type': 'string',
        },
        'key_five': {
            'default': 12,
            'type': 'int',
        },
        'key_six': {
            'default': 'INFO',
            'type': 'enum',
            'values': [
                'DEBUG',
                'INFO',
                'WARNING',
                'ERROR'
            ],
        },
        'key_seven': {
            'default': '12',
            'deprecated': True,
            'replaced_by': 'key_five',
            'type': 'int',
        }
    }

    def __init__(self):
        envkeys = gather_environ(keys=MyClass.keys)
        print(envkeys)

File-based secrets

Use get_environ_value to resolve a value from either an environment variable or a <NAME>_FILE file path (the container secrets convention). It reads <NAME>_FILE first (returning the file contents stripped of surrounding whitespace), falls back to <NAME>, and returns None when neither is set. Setting both raises an error. So does an unreadable <NAME>_FILE path.

from egos_helpers import get_environ_value

# MYAPP_TOKEN=secret123           -> "secret123"
# MYAPP_TOKEN_FILE=/run/secrets/t -> contents of the file, stripped
token = get_environ_value("MYAPP_TOKEN")