This module defines the event struct, which is created for all incoming messages from clients and passed into the incoming function of extensions.

This struct contains the following fields:

• :client_id registered client ID for this client.
• :message a Pixie.Message.* struct, containing the incoming message.
• :response a Pixie.Response.* struct, containing the response to be sent to the client.
• :meta a map within which you can store arbitrary information during the course of extension processing.