nest-feature-guard/dist/redis-feature-flag-cache.js

A powerful, NestJS-first feature flag guard and decorator library with Redis caching support. Perfect for implementing feature toggles, A/B testing, gradual rollouts, and user-specific feature access control.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.RedisFeatureFlagCache = void 0;
class RedisFeatureFlagCache {
    redis;
    featureKeyPrefix;
    constructor(redis, featureKeyPrefix = 'crudmates:feature-guard') {
        this.redis = redis;
        this.featureKeyPrefix = featureKeyPrefix;
    }
    async setFeatureFlag({ flag, enabled, userIds }) {
        const featureInfoKey = `${this.featureKeyPrefix}:${flag}:info`;
        const featureUsersKey = `${this.featureKeyPrefix}:${flag}:users`;
        await this.redis.hmset(featureInfoKey, { enabled: enabled ? 'true' : 'false' });
        if (userIds && userIds.length > 0) {
            await this.redis.del(featureUsersKey);
            const batchSize = 1000;
            for (let i = 0; i < userIds.length; i += batchSize) {
                const batch = userIds.slice(i, i + batchSize);
                await this.redis.sadd(featureUsersKey, ...batch);
            }
        }
        else {
            await this.redis.del(featureUsersKey);
        }
    }
    async getFeature(flag) {
        const featureInfoKey = `${this.featureKeyPrefix}:${flag}:info`;
        const featureUsersKey = `${this.featureKeyPrefix}:${flag}:users`;
        const info = await this.redis.hgetall(featureInfoKey);
        if (!info || !('enabled' in info))
            return null;
        const enabled = info.enabled === 'true';
        const userIds = await this.redis.smembers(featureUsersKey);
        return {
            enabled,
            userIds: userIds.length > 0 ? userIds : undefined,
        };
    }
    async hasFeatureFlag(flag, userId) {
        const featureInfoKey = `${this.featureKeyPrefix}:${flag}:info`;
        const featureUsersKey = `${this.featureKeyPrefix}:${flag}:users`;
        const info = await this.redis.hgetall(featureInfoKey);
        if (!info || !('enabled' in info))
            return false;
        const enabled = info.enabled === 'true';
        if (!enabled) {
            return false;
        }
        const userIds = await this.redis.smembers(featureUsersKey);
        const hasUsers = userIds.length > 0;
        if (!hasUsers) {
            return true;
        }
        const isUserInList = userIds.includes(userId);
        return isUserInList;
    }
}
exports.RedisFeatureFlagCache = RedisFeatureFlagCache;
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