layered-loader/dist/lib/redis/AbstractRedisCache.js

Data loader with support for caching and fallback data sources

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.AbstractRedisCache = exports.DEFAULT_REDIS_CACHE_CONFIGURATION = void 0;
exports.DEFAULT_REDIS_CACHE_CONFIGURATION = {
    json: false,
    prefix: 'layered-cache:',
    ttlInMsecs: 1000 * 60 * 10,
    separator: ':',
};
class AbstractRedisCache {
    redis;
    config;
    constructor(redis, config) {
        this.redis = redis;
        // @ts-ignore
        this.config = {
            ...exports.DEFAULT_REDIS_CACHE_CONFIGURATION,
            ...config,
        };
    }
    internalSet(resolvedKey, value) {
        const resolvedValue = value && this.config.json ? JSON.stringify(value) : value;
        if (this.config.ttlInMsecs) {
            return this.redis.set(resolvedKey, resolvedValue, 'PX', this.config.ttlInMsecs);
        }
        return this.redis.set(resolvedKey, resolvedValue);
    }
    postprocessResult(redisResult) {
        if (redisResult && this.config.json) {
            return JSON.parse(redisResult);
        }
        // Redis returns "null" for unknown values
        // ToDo We should create some fictional value for explicitly null values for redis
        if (redisResult === null) {
            return undefined;
        }
        return redisResult;
    }
    async clear() {
        const pattern = this.resolveCachePattern();
        let cursor = '0';
        do {
            const scanResults = await this.redis.scan(cursor, 'MATCH', pattern);
            cursor = scanResults[0];
            if (scanResults[1].length > 0) {
                await this.redis.del(scanResults[1]);
            }
        } while (cursor !== '0');
    }
    resolveKey(key) {
        return `${this.config.prefix}${this.config.separator}${key}`;
    }
    resolveCachePattern() {
        return `${this.config.prefix}${this.config.separator}*`;
    }
}
exports.AbstractRedisCache = AbstractRedisCache;
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