@nazarkulyk/pta-kyma-cache v1.0.3

redis-example

Deploy redis to kyma

cd deploy
kubectl apply -f redis.yaml
kubectl apply -f redis-commander.yaml

Redis Commander

Create API Rule for redis commander, than you will have GUI Access to your redis storage

Create function

{
  "name": "redis-example",
  "version": "1.0.0",
  "dependencies": {
      "redis": "^3.0.2",
      "nanoid": "^3.1.12",
      "lodash": "^4.17.20"
  }
}

const redis = require('redis');
const { nanoid } = require('nanoid');
const { pick, omit } = require('lodash');
const { promisify } = require("util");

/**
 * Use it like that:
 *
 *  get Redis Service Info:
 *  https://redis-demo.c-9a36b66.kyma.shoot.live.k8s-hana.ondemand.com/info
 *
 *  protocol some data from request:
 *
 */


const REQUEST_DATA_LIST = ['path', 'query', 'url', 'body'];

class RedisStorage {
  storage = undefined;
  asyncGet = void 0;
  asyncKeys = void 0;
  asyncSet = void 0;
  asyncInfo = void 0;

  constructor(options) {
    this.storage = redis.createClient(options);
    this.asyncGet = promisify(this.storage.get).bind(this.storage);
    this.asyncKeys = promisify(this.storage.keys).bind(this.storage);
    this.asyncSet = promisify(this.storage.set).bind(this.storage);
    this.asyncInfo= promisify(this.storage.info).bind(this.storage);
  }

  async getAll() {
    let values = [];
    const keys = await this.asyncKeys("*");
    for (const key of keys) {
      const value = await this.asyncGet(key);
      values.push(JSON.parse(value));
    }
    return values;
  }

  async info() {
    return this.asyncInfo();
  }

  async set(data = {}) {
    if (!data.id) {
      data.id = nanoid();
    }
    const value = await this.asyncGet(data.id);
    if (value) {
      throw new Error('Object already exists');
    }
    await this.asyncSet(data.id, JSON.stringify(omit(data, 'id')));
    return data.id;
  }
}


module.exports = {
  main: async (event, context) => {
    const path = event.extensions.request.path;

    let storage;

    try {
      storage = new RedisStorage({host: process.env.REDIS_HOST, port: process.env.REDIS_PORT});
    } catch(e) {
      console.error(e);
      throw new Error(e);
    }

    if(path === "/info") {
      return storage.info()
    } else if(path === "/set") {
      return storage.set({ path, date: new Date(), request: pick(event.extensions.request, REQUEST_DATA_LIST)});
    } else if(path === "/get") {
      return storage.getAll();
    } else {
      return "provide some operator";
    }
  }
}