Declarative generator for MySQL protocol messages, which can generate based on declarative description decoder and encoder.

Example:

  defcoder :text_cmd do
    command 1
    statement :string_eof
  end

Will generate 2 functions:

__encode__({:text_cmd, 0x0e, "test"}) # => <<14, 116, 101, 115, 116>>

__decode__(:text_cmd, <<14, 116, 101, 115, 116>>) # => {:text_cmd, 14, "test"}

Additionally it generates record, like Record.record(:text_cmd, [:command, :statement]), so that you can use it to create commands or access information in it.

Example would be: text_cmd(command: 14, statement: "test")

Check Mariaex.Messages for more examples.

For now, there is possible to insert custom functions for decoding of data. Example is in handshake command:

See definition and implementation:

`auth_plugin_data2: {__MODULE__, auth_plugin_data2}`

It is used only for decoding, but it may change in the future for encoding.