Class: MysqlReplicator::Binlogs::EventParser

Inherits:
Object
  • Object
show all
Defined in:
lib/mysql_replicator/binlogs/event_parser.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ EventParser

Returns a new instance of EventParser.



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# File 'lib/mysql_replicator/binlogs/event_parser.rb', line 31

def initialize
  @stored_table_map = {}
end

Instance Method Details

#execute(payload, connection, checksum_enabled) ⇒ Object 



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# File 'lib/mysql_replicator/binlogs/event_parser.rb', line 39

def execute(payload, connection, checksum_enabled)
  offset = 0

  timestamp = Time.at(MysqlReplicator::StringUtil.read_uint32(payload[offset, 4]))
  offset += 4
  event_type = readable_event_type(MysqlReplicator::StringUtil.read_uint8(payload[offset]))
  offset += 1
  server_id = MysqlReplicator::StringUtil.read_uint32(payload[offset, 4])
  offset += 4
  event_length = MysqlReplicator::StringUtil.read_uint32(payload[offset, 4])
  offset += 4
  next_position = MysqlReplicator::StringUtil.read_uint32(payload[offset, 4])
  offset += 4
  flags = MysqlReplicator::StringUtil.read_uint16(payload[offset, 2])
  offset += 2

  payload_length = event_length - offset

  execution = parse_execution_data(
    event_type,
    MysqlReplicator::StringUtil.read_str(payload[offset, payload_length]),
    connection,
    checksum_enabled
  )

  {
    timestamp: timestamp,
    event_type: event_type,
    server_id: server_id,
    length: event_length,
    next_position: next_position,
    flags: flags,
    execution: execution
  }
end

#parse_execution_data(event_type, payload, connection, checksum_enabled) ⇒ Object 



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# File 'lib/mysql_replicator/binlogs/event_parser.rb', line 107

def parse_execution_data(event_type, payload, connection, checksum_enabled)
  case event_type
  when :QUERY
    MysqlReplicator::Binlogs::QueryEventParser.parse(payload, checksum_enabled)
  when :ROTATE
    MysqlReplicator::Binlogs::RotateEventParser.parse(payload, checksum_enabled)
  when :FORMAT_DESCRIPTION
    MysqlReplicator::Binlogs::FormatDescriptionEventParser.parse(payload)
  when :TABLE_MAP
    result = MysqlReplicator::Binlogs::TableMapEventParser.parse(payload, connection)
    # Store in table map for future row events
    @stored_table_map[result[:table_id]] = result
    result
  when :WRITE_ROWS
    MysqlReplicator::Binlogs::RowsEventParser.parse(:WRITE_ROWS, payload, checksum_enabled, @stored_table_map)
  when :UPDATE_ROWS
    MysqlReplicator::Binlogs::RowsEventParser.parse(:UPDATE_ROWS, payload, checksum_enabled, @stored_table_map)
  when :DELETE_ROWS
    MysqlReplicator::Binlogs::RowsEventParser.parse(:DELETE_ROWS, payload, checksum_enabled, @stored_table_map)
  when :XID
    MysqlReplicator::Binlogs::XidEventParser.parse(payload)
  else
    {}
  end
end

#readable_event_type(event_type) ⇒ Object

Basic event type identification



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# File 'lib/mysql_replicator/binlogs/event_parser.rb', line 79

def readable_event_type(event_type)
  case event_type
  when 2
    :QUERY
  when 4
    :ROTATE
  when 15
    :FORMAT_DESCRIPTION
  when 16
    :XID
  when 19
    :TABLE_MAP
  when 30
    :WRITE_ROWS
  when 31
    :UPDATE_ROWS
  when 32
    :DELETE_ROWS
  else
    :UNKNOWN
  end
end