Class: Seabright::Storage::Redis

Inherits:
Adapter
  • Object
show all
Defined in:
lib/redis_object/storage/redis.rb

Constant Summary collapse

DUMP_SEPARATOR = 
"---:::RedisObject::DUMP_SEPARATOR:::---"
REC_SEPARATOR = 
"---:::RedisObject::REC_SEPARATOR:::---"

Instance Method Summary collapse

Methods inherited from Adapter

#config, #config_opts, #configure, #connection, #connections, #initialize, #reset

Constructor Details

This class inherits a constructor from Seabright::Storage::Adapter

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args, &block) ⇒ Object 



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# File 'lib/redis_object/storage/redis.rb', line 5

def method_missing(sym, *args, &block)
	return super unless connection.respond_to?(sym)
	puts "[Storage::Redis] #{sym}(#{args.inspect.gsub(/\[|\]/m,'')})" if Debug.verbose?
	begin
		connection.send(sym,*args, &block)
	rescue ::Redis::InheritedError => err
		puts "Rescued: #{err.inspect}" if DEBUG
		reset
		connection.send(sym,*args, &block)
	rescue ::Redis::TimeoutError => err
		puts "Rescued connection timeout: #{err.inspect}" if DEBUG
		reset
		connection.send(sym,*args, &block)
	end
end

Instance Method Details

#dump_to_file(file) ⇒ Object 



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# File 'lib/redis_object/storage/redis.rb', line 30

def dump_to_file(file)
	File.open(file,'wb') do |f|
		keys = connection.send(:keys,"*")
		f.write keys.map {|k|
			v = connection.dump(k)
			v.force_encoding(Encoding::BINARY)
			[k,v].join(DUMP_SEPARATOR)
		}.join(REC_SEPARATOR)
	end
end

#new_connection ⇒ Object 



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# File 'lib/redis_object/storage/redis.rb', line 21

def new_connection
	require 'redis'
	puts "Connecting to Redis with: #{config_opts(:path, :db, :password, :host, :port, :timeout, :tcp_keepalive).inspect}" if DEBUG
	::Redis.new(config_opts(:path, :db, :password, :host, :port, :timeout, :tcp_keepalive))
end

#rename_class(old_name, new_name) ⇒ Object 



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# File 'lib/redis_object/storage/redis.rb', line 54

def rename_class old_name, new_name
	old_name = old_name.to_s#.split('::').last
	new_name = new_name.to_s#.split('::').last
	old_collection_name = old_name.split('::').last.underscore.pluralize
	new_collection_name = new_name.split('::').last.underscore.pluralize

	# references to type in collection data
	keys("#{old_name}:*:backreferences").each do |backref_key|
		smembers(backref_key).each do |hashref|
			# there are two referenes we need to fix: individual references to items
			# and lists of collection names.
			#
			# this updates the item references in collections
			backref = hashref.sub(/_h$/,'');
			old_collection = "#{backref}:COLLECTION:#{old_collection_name}"
			new_collection = "#{backref}:COLLECTION:#{new_collection_name}"
			zrange(old_collection, 0, 99999, withscores:true).each do |key, score|
				zadd(new_collection, score, key.sub(/^#{old_name}/, new_name))
			end
			del(old_collection)

			# this updates the lists of collection names
			collection_names = "#{hashref}:collections"
			smembers(collection_names).each do |collection_name|
				if collection_name == old_collection_name
					sadd(collection_names, new_collection_name)
					srem(collection_names, old_collection_name)
				end
			end
		end
		rename(backref_key, backref_key.sub(/^#{old_name}/, new_name))
	end

	# type-wide id index
	smembers(old_name.pluralize).each do |key|
		sadd(new_name.pluralize, key.sub(/^#{old_name}/, new_name))
		old_class = hget("#{key}_h", :class)
		old_key = hget("#{key}_h", :key)
		hset("#{key}_h", :class, old_class.sub(/#{old_name}$/, new_name))
		hset("#{key}_h", :key, old_key.sub(/^#{old_name}/, new_name))
		hset("#{key}_h", "#{new_name.downcase}_id", key.sub(/^#{old_name}:/,''))
		hdel("#{key}_h", "#{old_name.downcase}_id")
	end
	del(old_name.pluralize)

	# column indexes
	keys("#{old_name.pluralize}::*").each do |old_index|
		new_index = old_index.sub(/^#{old_name.pluralize}/, new_name.pluralize)
		zrange(old_index, 0, 99999, withscores:true).each do |key, score|
			zadd(new_index, score, key.sub(/^#{old_name}/, new_name))
		end
		del(old_index)
	end

	# top-level keys
	keys("#{old_name}:*").each do |key|
		rename(key, key.sub(/^#{old_name}/, new_name))
	end
	keys("#{old_name.pluralize}:*").each do |key|
		rename(key, key.sub(/^#{old_name.pluralize}/, new_name.pluralize))
	end
end

#restore_from_file(file) ⇒ Object 



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# File 'lib/redis_object/storage/redis.rb', line 41

def restore_from_file(file)
	str = File.read(file)
	str.force_encoding(Encoding::BINARY)
	str.split(REC_SEPARATOR).each do |line|
		line.force_encoding(Encoding::BINARY)
		key, val = line.split(DUMP_SEPARATOR)
		connection.multi do
			connection.del key
			connection.restore key, 0, val
		end
	end
end