Class: RDB::Reader

Inherits:
Object
  • Object
show all
Defined in:
lib/rdb/reader.rb

Class Method Summary collapse

Class Method Details

.read(rdb, options = {}) ⇒ Object 



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# File 'lib/rdb/reader.rb', line 10

def read(rdb, options = {})
  rdb_version = read_rdb_version(rdb)

  state = ReaderState.new(options[:callbacks])
  callbacks = state.callbacks

  callbacks.start_rdb(rdb_version)

  loop do
    state.key_type_id = rdb.readbyte
    state.info = {}

    case state.key_type_id
    when Opcode::EXPIRETIME_MS
      state.key_expiration = rdb.read(8).unpack('Q').first * 1000
      state.info[:precision] = :millisecond
      state.key_type_id = rdb.readbyte

    when Opcode::EXPIRETIME
      state.key_expiration = rdb.read(4).unpack('L').first * 1000000
      state.info[:precision] = :second
      state.key_type_id = rdb.readbyte

    when Opcode::SELECTDB
      callbacks.end_database(state.database) unless state.database.nil?
      state.database = read_length(rdb).first
      callbacks.start_database(state.database)
      next

    when Opcode::EOF
      callbacks.end_database(state.database) unless state.database.nil?
      callbacks.end_rdb()
      break
    end

    state.key = read_string(rdb)

    if callbacks.accept_key?(state)
      read_object(rdb, state)
      notify_expiration(state) if state.key_expires?
    else
      skip_object(rdb, state)
    end
  end
end

.read_file(rdb_file, options = {}) ⇒ Object 



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# File 'lib/rdb/reader.rb', line 4

def read_file(rdb_file, options = {})
  File.open(rdb_file, 'rb') do |rdb|
    read(rdb, options)
  end
end