cache.js

/**
 * A simple in-memory cache implementation
 */

import { Redis } from 'ioredis';

export class RedisListCache {
    constructor(params = {}) {
        this.redis = new Redis({
            host: 'redis-12291.c305.ap-south-1-1.ec2.cloud.redislabs.com',
            port: 12291,
            password: 'KQCVapXXF2ioM4zF5krQFImzAYkKWY5l',
            username: "default"
        })
        this.namespace = params.namespace ? params.namespace + ':' : '';
    }

    // Get a value from the list
    async getItem(key, index) {
        const namespacedKey = this.namespace + key;
        const item = await this.redis.lindex(namespacedKey, index);
        return item ? JSON.parse(item) : null;
    }

    // Get a value from the list
    async updateItem(key, index, newValue) {
        const namespacedKey = this.namespace + key;
        const length = await this.redis.llen(namespacedKey);
        if (index >= length) {
            throw new Error('Index out of range');
        }

        // Update the item at the specified index
        await this.redis.lset(namespacedKey, index, JSON.stringify(newValue));
    }

    // Get a all keys
    async keys(key) {
        const namespacedKey = this.namespace + key;
        return this.redis.keys(namespacedKey);
    }

    // check if key exists
    async exists(key, index) {
        const namespacedKey = this.namespace + key;
        const item = await this.redis.exists(namespacedKey);
        return item;
    }

    // Set multiple values in the list
    async setItems(key, ...values) {
        const namespacedKey = this.namespace + key;
        const items = values.map(value => JSON.stringify({
            ...value,
        }));
        await this.redis.rpush(namespacedKey, ...items);
    }

    // Remove a value from the list
    async removeItem(key, count, value) {
        const namespacedKey = this.namespace + key;
        const item = JSON.stringify(value);
        return this.redis.lrem(namespacedKey, count, item);
    }

    // Get the length of the list
    async length(key) {
        const namespacedKey = this.namespace + key;
        return this.redis.llen(namespacedKey);
    }

    // Get all items from the list
    async getAll(key, page, limit) {
        const namespacedKey = this.namespace + key;
        const items = await this.redis.lrange(namespacedKey, 0, -1);
        if (page && limit) {
            const startIndex = (page - 1) * limit;
            const endIndex = startIndex + limit;
            const _items = items.slice(startIndex, endIndex);
            return _items.map(item => JSON.parse(item));
        }
        return items.map(item => JSON.parse(item));
    }

    // Remove all items from the list
    async clear(key) {
        const namespacedKey = this.namespace + key;
        return this.redis.del(namespacedKey);
    }

    // Close the Redis connection
    async close() {
        await this.redis.quit();
    }
}