Feature request: Time based feature flags actions

Use case

I’ve got a few use cases for feature flags rule actions. It’s possible to due that today but its really finicky.

1. I’d like to turn on/enable a feature flags rule only during a certain time of the day (between 10:00-23:00 24 hours clock)
2. i’d like to turn on/enable a feature flags rule during a certain date range (UTC time)
3. i’d like to turn on/enable a feature flags rule only during weekends, or just weekdays
4. i’d like to turn on/enable a feature flags rule during certain week days and certain hours

I’d like to be able to do combine these conditions with other conditions.

I think the implementation is simple, just need to define the UX.

Solution/User Experience

Time based conditions are sorely missing from the current solution.

Alternative solutions

use regular actions. Use rules that define time as unix time ints and define actions like KEY_GREATER_THAN_VALUE and KEY_LESS_THAN_VALUE.
Not really readable when using unix time ints but it can work.
Not agreat UX.

Acknowledgment

• This feature request meets Lambda Powertools Tenets
• Should this be considered in other Lambda Powertools languages? i.e. Java, TypeScript

[ran-isenberg]

@leandrodamascena I’ve also been working on a PR. I’ll create a PR later today so we could merge the code.

[leandrodamascena]

Hi @heitorlessa and @ran-isenberg! First of all, thank you so much for sharing your code with us Ran! This made the initial steps much easier.

I’m still at the beginning of the code but I can already validate a feature flag with a condition for specific days of the week. What do you think about me opening a PR in the next few days and we can work to improve and validate that @ran-isenberg? There will definitely be things to change or improve and we can work together on that.

For now, see this example:

SAM app.py

from aws_lambda_powertools.utilities.feature_flags import FeatureFlags, AppConfigStore
from aws_lambda_powertools import Logger

logger = Logger(sampling_rate=1,level="DEBUG")

app_config = AppConfigStore(
    environment="dev",
    application="comments",
    name="features",
    logger=logger
)

feature_flags = FeatureFlags(store=app_config, logger=logger)

def lambda_handler(event, context):

    ctx = { "tier": "premium", "CURRENT_DAY_UTC": ["tHuRsDaY","MONDAY"]}
    has_premium_features: bool = feature_flags.evaluate(name="premium_features",
                                                        context=ctx, default=False)
    print(has_premium_features)
    if has_premium_features:
        print("RULE MATCH")

JSON

{
  "premium_features": {
    "default": false,
    "rules": {
      "customer tier equals premium": {
        "when_match": true,
        "conditions": [
          {
            "action": "EQUALS",
            "key": "tier",
            "value": "premium"
          },
          {
            "action": "TIME_SELECTED_DAYS",
            "key": "CURRENT_DAY_UTC",
            "value": "THURSDAY"
          }
        ]
      }
    }
  }
}

Lambda execution