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redis-delete-wildcard

v0.0.3

Published

Addon to node_redis for atomic deletes using wildcards in keys

Readme

redis-delete-wildcard

Delete a set of keys from a pattern with wildcard. Operation is done through a lua script, and therefore atomic. It extends standard [node_redis][] library with a new method delwild. [node_redis]: https://github.com/mranney/node_redis

Getting started

Install the module with: npm install redis-delete-wildcard

// Create a redis client
var redis = require('redis');
require('redis-delete-wildcard')(redis); //pass in redis so prototype can be extended
var client = redis.createClient();

// Usage
client.delwild('pattern:*', function(error, numberDeletedKeys) {
    console.log(numberDeletedKeys);
}

Why should I use it?

  • This method call is atomic and executed by Redis via LUA script.
  • Foreach loops should be faster in Redis LUA than in Node.
  • Simple source (check its just 29 lines)
  • Works great for small datasets, will spare much time in writing array handling code

Why shouldn't?

  • KEYS command in Redis is not recommended for large sets of data.
  • unpack() in LUA can give some errors when sets of data are couple of thousand
  • If you need to delete a part of database, for example delete all cache on application upstart, simpler solution is to partition data by numeric database and use flush/flushdb

Contributing, & @todo list ;)

  • tests please
  • make lua script use SCAN instead of KEYS
  • use SCRIPT LOAD & EVALSHA instead of EVAL