Move keys from multiple sources into one. Works only with strings

redis-migrator.rb

require 'rubygems'
require 'redis'
require 'uri'

  
class Redis
  module Helper

   def parse_redis_url(redis_url)
      node = URI(redis_url)
      path = node.path
      db = path[1..-1].to_i rescue 0

      {
        :host => node.host,
        :port => node.port || 6379,
        :db   => db
      }
    end
   end
end


     
class Redis
  class Migrator
    include Redis::Helper

    attr_accessor :from, :to
    
    def initialize(from, to)
      self.from = from.collect{|url| Redis.new(parse_redis_url(url)) }
      self.to   = to.collect{|url| Redis.new(parse_redis_url(url)) }
    end

    def migrate
      self.from.each do |from|
        self.to.each do |to|
          keys = from.keys('*')

          keys.each do |key|       
            value = from.get(key)
            ttl   = from.ttl(key)

            if ttl > 1
              puts "Moving key #{key}=#{value} with ttl #{ttl}"

              to.setex(key, ttl, value)
            end        
          end

        end
      end
    end

  end
end


from = ["redis://192.168.0.69:6382/5", "redis://192.168.0.69:6383/5"]
to   = ["redis://localhost:6379/5"]

@migrator = Redis::Migrator.new(from, to)
@migrator.migrate