unleash-server
Version:
Unleash is an enterprise ready feature flag service. It provides different strategies for handling feature flags.
43 lines • 1.68 kB
JavaScript
import { Strategy } from './strategy.js';
import { normalizedStrategyValue } from './util.js';
import { resolveContextValue } from '../helpers.js';
const STICKINESS = {
default: 'default',
random: 'random',
};
export default class FlexibleRolloutStrategy extends Strategy {
constructor(radnomGenerator) {
super('flexibleRollout');
this.randomGenerator = () => `${Math.round(Math.random() * 10_000) + 1}`;
if (radnomGenerator) {
this.randomGenerator = radnomGenerator;
}
}
resolveStickiness(stickiness, context) {
switch (stickiness) {
case STICKINESS.default:
return (context.userId ||
context.sessionId ||
this.randomGenerator());
case STICKINESS.random:
return this.randomGenerator();
default:
return resolveContextValue(context, stickiness);
}
}
// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
isEnabled(parameters, context) {
const groupId = parameters.groupId ||
(context.featureToggle && String(context.featureToggle)) ||
'';
const percentage = Number(parameters.rollout);
const stickiness = parameters.stickiness || STICKINESS.default;
const stickinessId = this.resolveStickiness(stickiness, context);
if (!stickinessId) {
return false;
}
const normalizedUserId = normalizedStrategyValue(stickinessId, groupId);
return percentage > 0 && normalizedUserId <= percentage;
}
}
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