mrflagly 0.1.0

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Introduction

Feature flagging should not be so complicated.

Mr Flagly is a decentralized feature flagging system written in Rust with bindings for other languages.

It does not depend on a costly third party service or require you to deploy services and databases to manage.

Supported feature flag definition sources:

• URL
• JSON Value
• Environment Variable

Rust usage

Setup your flag service:

use mrflagly::service::{FlagService, FlagServiceOptions};
let flag_service = FlagService::new(FlagServiceOptions {
    finder_type: mrflagly::service::types::FlagFinderType::URL,
    url: "https://path/to/hosted/json/file",
    refresh_interval: 600,
    data: None,
    env_var: None,
})

Then, to check for feature flag:

if flag_service.enabled("feature_x", false /* default value */, Some(HashMap::from([(String::from("user_id"), String::from("123")),])) /* optional context */) {
    // do something
}

Python support

import mrflagly
import json

flag_service = mrflagly.FlagService(data=json.dumps({"feature_x": {"rollout": 100}}))
if flag_service.enabled("feature_x", False, None):
    # do something

JSON format

The format of your JSON feature flagging data that you use must be in the following format:

{
    "my_feature": {
        "rollout": 100
    },
    "my_feature_with_variants": {
        "rollout": 0,
        "variants" {
            "user_id": ["123"],
            "company_id": ["123"]
        }
    }
}