syntropylog/dist/services/UserService.js

An instance manager with observability for Node.js applications

/**
 * FILE: src/services/UserService.ts
 * DESCRIPTION: An example service to demonstrate testing with BeaconRedisMock.
 */
// A mock database function to simulate fetching data from a primary source.
async function fetchUserFromDb(userId) {
    // In a real app, this would be a database query.
    return { id: userId, name: 'John Doe', email: 'john.doe@example.com' };
}
export class UserService {
    redis;
    userCacheTtl = 3600; // 1 hour
    constructor(redisClient) {
        this.redis = redisClient;
    }
    async getUserById(userId) {
        const cacheKey = `user:${userId}`;
        const cachedUser = await this.redis.get(cacheKey);
        if (cachedUser) {
            return JSON.parse(cachedUser);
        }
        const user = await fetchUserFromDb(userId);
        await this.redis.set(cacheKey, JSON.stringify(user), this.userCacheTtl);
        return user;
    }
}
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