ranvier-datasource-redis/RedisDataSource.js

datasource for ranvier

'use strict';

const redis = require('redis');
const { Logger } = require('ranvier');

class RedisDataSource {
  constructor() {
    this.db = redis.createClient({db:3});
    this.db.on('error', err => {
      Logger.error(`Redis - Connect: ${err}`);
    });
    this.db.on('ready', () => {
      Logger.log('Redis Connection');
    });
  }

  async hasData(config = {}) {
    await this.db.select(config.db);
    return new Promise((resolve, reject) => {
      this.db.dbsize((err, data) => {
        if (err) {
          Logger.error(`Redis - hasData: ${err}`);
          reject(err);
          return;
        }
        resolve(data > 0);
      });
    });
  }

  async fetchAll(config = {}) {
    await this.db.select(config.db);
    return new Promise((resolve, reject) => {
      this.db.keys('*', (err, data) => {
        if (err) {
          Logger.error(`Redis - fetchAll: ${err}`);
          reject(err)
          return;
        }
        resolve(data);
      });
    });
  }

  async fetch(config = {}, id) {
    await this.db.select(config.db);
    return new Promise((resolve, reject) => {
      this.db.get(id, (err, data) => {
        if (err) {
          Logger.error(`Redis - fetch: ${err}`);
          reject(err);
          return;
        }
        resolve(JSON.parse(data));
      });
    });
  }

  async replace(config = {}, data) {
    await this.db.select(config.db);
    return new Promise((resolve, reject) => {
      this.db.del(data, (err, data) => {
        if (err) {
          Logger.error(`Redis - replace: ${err}`);
          reject(err);
          return;
        }
        resolve(data);
      });
    });
  }

  async update(config = {}, id, data) {
    await this.db.select(config.db);
    return new Promise((resolve, reject) => {
      this.db.set(id, JSON.stringify(data), (err, data) => {
        if (err) {
          Logger.error(`Redis - update: ${err}`);
          reject(err);
          return;
        }
        resolve(data);
      });
    });
  }
}

module.exports = { RedisDataSource };