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Python client for the Unleash feature toggle system!

Project description

unleash-client-python

Coverage Status PyPI version PyPI - Python Version License: MIT

This is the Python client for Unleash. It implements Client Specifications 1.0 and checks compliance based on spec in unleash/client-specifications

What it supports:

  • Default activation strategies using 32-bit Murmerhash3
  • Custom strategies
  • Full client lifecycle:
    • Client registers with Unleash server
    • Client periodically fetches feature toggles and stores to on-disk cache
    • Client periodically sends metrics to Unleash Server
  • Tested on Linux (Ubuntu), OSX, and Windows

Check out the project documentation and the changelog.

Installation

Check out the package on Pypi!

pip install UnleashClient

Usage

Initialization

from UnleashClient import UnleashClient
client = UnleashClient("https://unleash.herokuapp.com/api", "My Program")
client.initialize_client()

To clean up gracefully:

client.destroy()

Arguments

Argument Description Required? Type Default Value
url Unleash server URL Y String N/A
app_name Name of your program Y String N/A
environment Name of current environment N String default
instance_id Unique ID for your program N String unleash-client-python
refresh_interval How often the unleash client should check for configuration changes. N Integer 15
metrics_interval How often the unleash client should send metrics to server. N Integer 60
disable_metrics Disables sending metrics to Unleash server. N Boolean F
disable_registration Disables registration with Unleash server. N Boolean F
custom_headers Custom headers to send to Unleash. N Dictionary {}
custom_strategies Custom strategies you'd like UnleashClient to support. N Dictionary {}

Checking if a feature is enabled

A check of a simple toggle:

client.is_enabled("My Toggle")

Specifying a default value:

client.is_enabled("My Toggle", default_value=True)

Supplying application context:

app_context = {"userId": "test@email.com"}
client.is_enabled("User ID Toggle", app_context)

Supplying a fallback function:

def custom_fallback(feature_name: str, context: dict) -> bool:
    return True

client.is_enabled("My Toggle", fallback_function=custom_fallback)
  • Must accept the fature name and context as an argument.
  • Client will evaluate the fallback function only if exception occurs when calling the is_enabled() method i.e. feature flag not found or other general exception.
  • If both a default_value and fallback_function are supplied, client will define the default value by ORing the default value and the output of the fallback function.

Getting a variant

Checking for a variant:

context = {'userId': '2'}  # Context must have userId, sessionId, or remoteAddr.  If none are present, distribution will be random.

variant = client.get_variant("MyvariantToggle", context)

print(variant)
> {
>    "name": "variant1",
>    "payload": {
>        "type": "string",
>        "value": "val1"
>        },
>    "enabled": True
> }

For more information about variants, see the Beta feature documentation.

Project details


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