redis-delete-wildcard v0.0.3

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.

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