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@reshuffle/redis-connector

v0.0.1

Published

Reshuffle connector to Redis

Downloads

3

Readme

reshuffle-redis-connector

Code | npm | Code sample

npm install reshuffle-redis-connector

Reshuffle Redis Connector

This package contains a Reshuffle connector to Redis databases.

The following example sets and gets a value from Redis:

const { Reshuffle } = require('reshuffle')
const { RedisConnector } = require('reshuffle-redis-connector')

const app = new Reshuffle()

const redis = new RedisConnector(app, {
  endpoint: process.env.REDIS_ENDPOINT,
  password: process.env.REDIS_PASSWORD,
})

async function main() {
  try {
    await redis.set('key', 'value')
    console.log(await redis.get('key')) // 'value'
  } catch (error) {
    console.error(error)
  }   
}

app.start()
main()

Table of Contents

Configuration Options

Connector actions

sequence Run a sequence of queries

transaction Run a sequence of queries inside a transaction

sdk Returns the Node Redis Client that allows direct calls to the underlying redis

close Close redis connections

Configuration options

const app = new Reshuffle()
const redis = new RedisConnector(app, {
  endpoint: process.env.REDIS_ENDPOINT, // <hostname>:<port>
  password: process.env.REDIS_PASSWORD,
})

Connector actions

Sequence action

Definition:

(
  seq: (query) => any,
) => any

Usage:

const res = await res.sequence(async (conn) => {
  const val = conn.get('key')
  conn.set('key', val + 1)
})

Use sequence to perform multiple queries on the same database connection. This assures sequential access, but not atomicity in case other connections are open to the database.

Transaction action

Definition:

(
  seq: (query) => any,
) => any

Usage:

await redis.transaction(async (multi) => {
  const val = multi.get('key')
  multi.set('key', val + 1)
})

Use transaction to execute multiple queries as an atomic sequence using a Redis transaction and the MULTI command.

All operations either succeed or fail together.

SDK action

The sdk() action provides raw access to the async version of npm redis. The following actions are provided as convenience wrappers for its corresponding async methods.

For instance, calling redis.sdk().append() is equivalent to redis.append(). You can access the methods not listed below using the redis.sdk(). notation.

async function append(key: string, value: any)
async function decr(key: string)
async function decrby(key: string, decrement: number)
async function del(key: string)
async function exists(key: string)
async function get(key: string)
async function getset(key: string, value: string)
async function hdel(key: string, field: string)
async function hexists(key: string, field: string)
async function hget(key: string, field: string)
async function hgetall(key: string)
async function hincrby(key: string, field: string, increment: number)
async function hincrbyfloat(key: string, field: string, increment: number)
async function hkeys(key: string)
async function hlen(key: string)
async function hmget(key: string, fields: string[])
async function hmset(key: string, dict: Record<string, any>)
async function hset(key: string, field: string, value: any)
async function hsetnx(key: string, field: string, value: any)
async function hstrlen(key: string, field: string)
async function hvals(key: string)
async function incr(key: string)
async function incrby(key: string, increment: number)
async function incrbyfloat(key: string, increment: number)
async function mget(keys: string[])
async function mset(dict: Record<string, any>)
async function set(key: string, value: any)
async function setnx(key: string, value: any)
async function keys(pattern: string): Promise<string[]>

Close action

Definition:

() => void

Usage:

await redis.close()

Close all connections to redis. If an application terminates without calling close, it might hang for a few seconds until all active connections time out.