node-redis-schema

Node Redis Schema (Beta)

Declarative Redis - persist complex data structures with Redis at ease.

Installation

npm install --save redis-schema

or

yarn add redis-schema

Usage

Define your data model by extending the BaseModel class and implement the getSchema method.

(Sample written in Typescript)

import {BaseModel, RedisSchemaType, Types} from 'redis-schema';

interface ITestShape {
  shapeNumber: number;
  shapeString: string;
  nestedShape: {
    nestedShapeListOf: Array<number>;
  };
}

interface IProps {
  listProp: Array<string>;
  hashProp: {[key: string]: string};
  setProp: Set<string>;
  stringProp: string;
  numberProp: number;
  listOfShapeProp: Array<ITestShape>;
  listOfListProp: Array<Array<number>>;
}

class TestModel extends BaseModel<IProps> {
  constructor(key: string = 'HTRedisTestModel') {
    super(key);
  }

  getSchema(): RedisSchemaType {
    return {
      listProp: Types.list,
      hashProp: Types.hash,
      setProp: Types.set,
      stringProp: Types.string,
      numberProp: Types.number,
      listOfShapeProp: Types.listOf<ITestShape>(
        Types.shape({
          shapeNumber: Types.number,
          shapeString: Types.string,
          nestedShape: Types.shape({
            nestedShapeListOf: Types.listOf<number>(Types.number),
          }),
        }),
      ),
    };
  }

  // This is important and you have to define the default behavior of your
  // model so it can be consumed by `Redis` class.
  static getInstance(): TestModel {
    const instance = new TestModel();
    return instance.setTtl({
      type: 'expire',
      value: 2,
    });
  }
}

To save and load model data, use the Redis class:

import {Redis} from 'redis-schema';

const modelData: IProps = {
  listProp: ['a', 'b', 'c'],
  hashProp: {
    a: '1',
    b: '2',
  },
  setProp: new Set(['1', '2', '3']),
  stringProp: 'test string',
  numberProp: 123,
  listOfShapeProp: [
    {
      shapeNumber: 0,
      shapeString: '0',
      nestedShape: {
        nestedShapeListOf: [0, 1, 2, 3],
      }
    },
    {
      shapeNumber: 2,
      shapeString: '2',
      nestedShape: {
        nestedShapeListOf: [2, 3, 4, 5],
      },
    },
  ],
  listOfListProp: [
    [1, 2, 3],
    [4, 5, 6],
  ],
};

async function saveLoad(): Promise<void> {
  const model = new Redis(TestModel);
  console.log(await model.genSaveModel(modelData));
  // => 'OK'
  console.log(await model.genLoadModel());
  // => modelData will be printed.
}

If you know React's (prop-types)[https://www.npmjs.com/package/prop-types] syntax, the redis schema's syntax should look very familiar to you. Just replace the prop-types terms with Redis terms. Built-in types include:

1. string

2. number

   This is still a string in Redis but conversion is done before saving or after loading

3. list

4. set

5. hash

6. listOf

   listOf accepts a single IRedisType implementation. All built-in types are IRedisType implementations so you can even store a list of lists.

7. shape

   Similar to listOf but the argument should be an object of IRedisType implementations.

All built-in types comes with data validation logic. 1 ~ 5 are simple instanceof checks. 6 and 7 uses their type arguments' validation and only passes when all items are valid. The implication is that all fields in a schema are treated as required fields. Null or undefined values are not acceptable.

Roadmap to V1:

1. Implement model registry to keep track of top-level model keys.
2. Add essential options, including but not limited to auth, redis server host and port