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)
  Log.verbose "[Storage::Redis] #{sym}(#{args.inspect.gsub(/\[|\]/m,'')})"
  begin
    connection.send(sym,*args, &block)
  rescue ::Redis::InheritedError, ::Redis::TimeoutError => err
    Log.debug "Rescued: #{err.inspect}"
    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 26

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

#new_connection ⇒ Object 



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# File 'lib/redis_object/storage/redis.rb', line 17

def new_connection
  require 'redis'
  Log.debug "Connecting to Redis with: #{config_opts(:path, :db, :password, :host, :port, :timeout, :tcp_keepalive).inspect}"
  ::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 53

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, new_name)
    hset("#{key}_h", :key, old_key.sub(/^#{old_name}/, new_name))
    hdel("#{key}_h", RedisObject.id_sym(old_name))
    hset("#{key}_h", RedisObject.id_sym(new_name), key.sub(/^#{old_name}:/,''))
  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 40

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