Package Exports

redis-json

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Readme

redis-json

Nodejs library to store/retreive JSON Objects in RedisDB

Description

Every time set is called JSON object is flattened(embeded objects are converted to path keys) and then stored in Redis(just like a normal hashset), on get the hashset is unflattened and converted back to the original JSON object(with the same types as the original object).

What's new in v4.3.0?

In response to issue: #17, we now support incrementing values with the methods incr() & incrT()(for transactions)

Installation

npm install redis-json --save

API

Please visit this page for detailed API documentation.

Usage

Simple

import Redis from 'ioredis';
import JSONCache from 'redis-json';

const redis = new Redis() as any;

const jsonCache = new JSONCache<{
  name: string;
  age: number;
  address: {
    doorNo: string;
    locality: string;
    pincode: number;
  }
}>(redis, {prefix: 'cache:'});

const user = {
  name: 'redis-json',
  age: 25,
  address: {
    doorNo: '12B',
    locality: 'pentagon',
    pincode: 123456
  },
  cars: ['BMW 520i', 'Audo A8']
}

await jsonCache.set('123', user)

await jsonCache.get('123')
// output
// {
//   name: 'redis-json',
//   age: 25,
//   address: {
//     doorNo: '12B',
//     locality: 'pentagon',
//     pincode: 123456
//   },
//   cars: ['BMW 520i', 'Audo A8']
// }

await jsonCache.set('123', {gender: 'male'})
await jsonCache.get('123')
// output
// {
//   name: 'redis-json',
//   age: 25,
//   address: {
//     doorNo: '12B',
//     locality: 'pentagon',
//     pincode: 123456
//   },
//   cars: ['BMW 520i', 'Audo A8']
//   gender: 'male'
// }

await jsonCache.get('123', 'name', 'age');
// output
// {
//   name: 'redis-json',
//   age: 25,
// }

await jsonCache.get('123', 'name', 'address.doorNo');
// {
//   name: 'redis-json',
//   address: {
//     doorNo: '12B'
//   }
// }

await jsonCache.clearAll();

await jsonCache.get('123');
// undefined


await jsonCache.incr('123', {age: 1}) // increments age by 1

With custom stringifier and parser:

const jsonCache = new JSONCache(redis, {
  stringifier: {
    Date: (val: Date) => val.toISOString()
  },
  parser: {
    Date: (str: string) => new Date(str)
  }
})

const date = new Date()
await jsonCache.set('test', {
  date: date
})

// Redis hashset
> hgetall jc:test /// data
1) "date"
2) "2020-05-17T14:41:45.861Z"
> hgetall jc:test_t /// type info
1) "date"
2) "Date"


const result = await jsonCache.get('test')
result.date == date /// true

With transactions:

const transaction = redisClient.multi();

transaction
  .set('name', 'foo')
  .set('bar', 'baz')

jsonCache.setT(transaction, 'test', {name: 'testing'})
jsonCache.delT(transaction, 'test1')
jsonCache.rewriteT(transaction, 'test2', {name: 'testing', age: 25})

transaction
  .exec(function(err, replies) => {
    /// your logic here after
  })

Please note that only setT(), rewriteT() & delT() supports transaction, where as get() & clearAll() do NOT support transaction because we process those results before returning it to the calling function. Moreover there is no real usecase in adding get methods to a transaction!

Since v4.0.0

Types of the data are retained when retrieved from Redis.

Changelogs

Please refer to this page

Coverage Report

npm run coverage

Contributions

This is open-source, which makes it obvious for any PRs, but I would request you to add necessary test-cases for the same.

Pre-requisites:

Run your redis-server and then point the same client to the same. An easier way to start redis-server, provided you've already installed docker (else visit this page) is by running this command:

docker run --rm -it --name redis -p 6379:6379 redis

We follow TDD approach, so write your test cases first and then run the same paralelly during development by running the following command:

npm run test:dev

LICENCE

MIT License