'use strict'

const redis = require('redis')
const client = redis.createClient()
let setSize = 20

client.sadd('bigset', 'a member')
client.sadd('bigset', 'another member')

while (setSize > 0) {
  client.sadd('bigset', `member ${setSize}`)
  setSize -= 1
}

// multi chain with an individual callback
client.multi()
    .scard('bigset')
    .smembers('bigset')
    .keys('*', (err, replies) => {
      if (err) throw err
      client.mget(replies, console.log)
    })
    .dbsize()
    .exec((err, replies) => {
      if (err) throw err
      console.log(`MULTI got ${replies.length} replies`)
      replies.forEach((reply, index) => {
        console.log(`Reply ${index}: ${reply.toString()}`)
      })
    })

client.mset('incr thing', 100, 'incr other thing', 1, console.log)

// start a separate multi command queue
const multi = client.multi()
multi.incr('incr thing', console.log)
multi.incr('incr other thing', console.log)

// runs immediately
client.get('incr thing', console.log) // 100

// drains multi queue and runs atomically
multi.exec((err, replies) => {
  if (err) throw err
  console.log(replies) // 101, 2
})

// you can re-run the same transaction if you like
multi.exec((err, replies) => {
  if (err) throw err
  console.log(replies) // 102, 3
  client.quit()
})