plain-flags-sdk 1.0.3

Python SDK for the Plain Flags free feature flag system

Plain Flags Python SDK

This module facilitates your software's connection to the Plain Flags feature flag system.

Requirements

You must host an installation of the Plain Flags feature flag back end services.

More about Plain Flags at plainflags.dev

The Plain Flags back end must run in an environment where your software can make http requests.

Installation

pip install plain-flags-sdk

Usage

Import the Plain Flags SDK package:

from plainflags import PlainFlags, PlainFlagsConfig

Create and configure an object of type PlainFlags at the start of your software's execution:

    config = PlainFlagsConfig(
        service_url="http://my-plainflags-states.dev",
        api_key="mySharedSecret",
        timeout_ms=10000,
        poll_interval_ms=30000)  # Poll every 30 seconds, or set to 0 to disable polling

    feature_flags = PlainFlags(config,
                              infoFunc=logging.info,  # Optional: provide custom logging functions
                              errorFunc=logging.error)

Initialize the object. The init() method is a coroutine:

    await feature_flags.init()

When your application is shutting down, stop the background polling if enabled:

    await feature_flags.stop_updates()

Any feature code you wish to enable and disable with feature flags will be within conditions like this:

if feature_flags.is_on("My feature"):
    # Your feature code here
    pass

You can provide a default value to return if the flag is not found:

if feature_flags.is_on("My feature", default=False):
    # Your feature code here
    pass

If your features are constrained to subsets of your users, you must specify which user is currently using the software (and other context you constrain your feature for, if applicable).

if feature_flags.is_on("My Feature", default=False, context={
    "userId": current_user().id,
    "countryCode": current_country_code(),
}):
    # Your feature code here
    pass

The keys userId and countryCode must match the constraint keys you created in the dashboard

Source code

github link