module RedisCopy
The Classic strategy borrows heavily from the utils/redis-copy.rb found in Redis source, which is also the inspiration for this gem.
#{REDIS}/utils/redis-copy.rb - Copyright © 2009-2010 Salvatore Sanfilippo. All rights reserved.
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Constants
- VERSION
Public Class Methods
@param source [String] @param destination [String] @options options [Hash<Symbol,Object>]
# File lib/redis-copy.rb, line 18 def copy(source, destination, options = {}) ui = UI.new(options) source = redis_from(source) destination = redis_from(destination) ui.abort('source cannot equal destination!') if same_redis?(source, destination) key_emitter = KeyEmitter.new(source, ui, options) strategem = Strategy.new(source, destination, ui, options) dest_empty = !(destination.randomkey) # randomkey returns string unless db empty. return false unless ui.confirm? <<-EODESC.strip_heredoc Source: #{source.client.id} Destination: #{destination.client.id} (#{dest_empty ? '' : 'NOT '}empty) Pattern: #{options[:pattern]} Key Emitter: #{key_emitter} Strategy: #{strategem} EODESC ui.abort('Destination not empty!') unless dest_empty or options[:allow_nonempty] key_emitter.keys.each_with_object(Hash.new {0}) do |key, stats| success = strategem.copy(key) stats[success ? :success : :failure] += 1 stats[:attempt] += 1 unless success ui.notify("FAIL: #{key.dump}") ui.abort if options[:fail_fast] end probably(options[:verify]) do if strategem.verify?(key) stats[:verified] += 1 else stats[:borked] += 1 ui.notify("BORK: #{key.dump}") ui.abort if options[:fail_fast] end end ui.notify("PROGRESS: #{stats.inspect}") if (stats[:attempt] % 1000).zero? end.tap do |stats| ui.notify("DONE: #{stats.inspect}") end rescue Implements::Implementation::NotFound => e ui.notify(e.to_s) ui.abort end
Private Class Methods
yields the block, probably. @param probability [Integer] 0-100 @return [void] used by ::copy
in determining whether to verify.
# File lib/redis-copy.rb, line 76 def probably(probability) return if probability.zero? if probability >= 100 || (Random::rand(100) % 100) < probability yield end end
# File lib/redis-copy.rb, line 89 def redis_from(connection_string) require 'uri' connection_string = "redis://#{connection_string}" unless connection_string.start_with?("redis://") uri = URI(connection_string) ret = {uri: uri} # Require the URL to have at least a host raise ArgumentError, "invalid url: #{connection_string}" unless uri.host host = uri.host port = uri.port if uri.port db = uri.path ? uri.path[1..-1].to_i : 0 password = uri.password # Connect & Ping to ensure access. Redis.new(host: host, port: port, db: db, password: password).tap(&:ping) rescue Redis::CommandError => e fail(Redis::CommandError, "There was a problem connecting to #{uri.to_s}\n#{e.message}") end
# File lib/redis-copy.rb, line 83 def same_redis?(redis_a, redis_b) # Redis::Client#id returns the connection uri # e.g. 'redis://localhost:6379/0' redis_a.client.id == redis_b.client.id end