idempotency-redis/dist/cache.js

Idempotency guarantee via Redis

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.RedisCache = void 0;
const cache_errors_1 = require("./cache.errors");
// Class representing a wrapper around Redis operations for caching.
class RedisCache {
    /**
     * Constructs an instance of RedisCache.
     * @param redis A RedisClientType instance for Redis operations.
     */
    constructor(redis) {
        this.redis = redis;
    }
    /**
     * Retrieves a cached result by key.
     * @param key The cache key to retrieve the value for.
     * @returns A promise that resolves to a CachedResult or null if the key is not found.
     */
    get(key) {
        return __awaiter(this, void 0, void 0, function* () {
            try {
                const { type, error, value } = yield this.redis.hgetall(key);
                if (!type) {
                    // If there's no type, the key doesn't exist in cache.
                    return null;
                }
                if (type === 'error') {
                    return {
                        type: 'error',
                        error,
                    };
                }
                return value ? { type: 'value', value } : { type: 'value' };
            }
            catch (error) {
                throw new cache_errors_1.RedisCacheError('Failed to get cached result', key, error);
            }
        });
    }
    /**
     * Sets a value in the cache.
     * @param key The cache key to set the value for.
     * @param value The CachedResult to store.
     * @returns A promise that resolves when the operation is complete.
     */
    set(key, value) {
        return __awaiter(this, void 0, void 0, function* () {
            try {
                yield this.redis.hset(key, value);
            }
            catch (error) {
                throw new cache_errors_1.RedisCacheError('Failed to set cached result', key, error);
            }
        });
    }
}
exports.RedisCache = RedisCache;