FuncTown is a python library that is designed to make your life with Azure Functions easier.

The core features of FuncTown are:

• Error handling - automatically handle errors and return a response to the user
• Debugging - Set debug flags that automatically return logs and traces as part of error responses from your function
• JWT token validation - automatically validate JWT tokens and provide the user information
• Request argument parsing - automatically parse arguments from the HttpRequest and provide them to your function
• Metrics - Handle connections to Application Insights and gives you easy to use metrics objects
• Logging, Tracing & Events - Log your functions data directly into Application Insights

For detailed features see the docs.

You can install FuncTown using pip:

pip install functown

Note that some dependencies are hidden behind sub-packages (e.g. functown[jwt] for JWT token validation).

Almost all functionality of FuncTown is provided through decorators. If you want to add error handling to your function:

from logging import Logger
from functown import ErrorHandler

@ErrorHandler(debug=True, enable_logger=True)
def main(req: func.HttpRequest, logger: Logger, **kwargs) -> func.HttpResponse:
    logger.info('Python HTTP trigger function processed a request.')

    # ...
    # exception will be caught and handled by the decorator (returning a 500)
    raise ValueError("something went wrong")

    return func.HttpResponse("success", status_code=200)

Note: Decorators might pass down additional arguments to your function, so it is generally a good idea to modify your function signature to accept these arguments (see docs for more information) and add a **kwargs to the end.

Decorators are also stackable, so we could parse function arguments and handle a JWT Token in the same function:

from functown import ArgsHandler, RequestArgHandler, AuthHandler
from functown.auth import Token

@ArgsHandler()
@AuthHandler(scopes=["user.read"])
def main(
    req: func.HttpRequest, args: RequestArgHandler, token: Token
) -> func.HttpResponse:
    # retrieve some arguments
    data = args.get_body_query("data_name", required=True, allowed=["foo", "bar"])
    switch = args.get_body("bool_name", map_fct='bool')
    file = args.get_file('file_name', required=True)

    # check the user id
    user_id = token.user_id

    # ...

This would also directly fail with a 400 message if there is no token provided, or the token does not contain the required scopes.

Be sure to check out the docs for a full overview of all decorators.

If you want to test it on your own Azure Subscription, you can check out the example guide in the dev section of the docs.

🎷 Welcome to FuncTown! 🎷

‼️ If you find this library helpful or have suggestions please let me know. Also any contributions are welcome! ‼️