node-redis-multi

A Node.js library to augment node_redis with an enhanced version of MULTI command.

Installation

npm install node-redis-multi --save

Usage

node-redis-multi replaces methods that are related to MULTI.

The callback of .exec() will get invoked with two arguments as the original version but second argument is a Response object.

 
// module deps
var
  redis = require('redis');
 
require('../lib/multi')(redis);
 
var
    client = redis.createClient(),
    multi = client.multi();
 
multi
    .set('path:to:key', 1)
    .get('path:to:key')
    .exec(function (error, response) {
        console.log(response.get('path:to:key')); // 1
        console.log(response.at(0)); // OK
        console.log(response.at(1)); // 1
    });

Response

Response object lets you query replies from .exec() using two different methods: Response#get(<key>) and Response#at(<index>).

Response#get(<key>) lets you retrieve a reply by key:

multi
    .set('path:to:key', 'value')
    .get('path:to:key')
    .exec(function (error, response) {
 
        var
            reply = response.get('path:to:key');
 
        console.log(reply); // value
    });

Response#get(<key>) is applicable only if the issued command has

• arity > 0;
• readonly flag;
• position of first key === 1;
• position of last key === 1.

See Redis COMMAND for further information.

Response#at(<index>) lets you retrieve a reply by its index:

multi
    .set('path:to:key', 'value')
    .get('path:to:key')
    .exec(function (error, response) {
 
        var
            reply = response.at(1);
            
        console.log(reply); // value
    });