Introduction

This page begins to describe the protocol level details for Hypergrid. It will apply only to Hypergrid 2.0 and later.

Components

Grid Services

Gatekeeper service

• Provides information to callers about Hypergrid accessible regions on the grid.
• Controls and manages user agent access to the grid - similar to the login service for non-Hypergrid users.
  • Authenticates an incoming connection with the source grid's User Agent VerifyAgent call.

User Agent service

• Provides a VerifyAgent call so that the Gatekeeper service can authenticate that an incoming user agent originates from its given source grid.

Simulator

As source of teleport

• Initiates teleport process once requested by a viewer.
  • Makes contact with destination grid's gatekeeper service.
  • On approval, signals client to begin teleport and starts hand off to source region.
    • Part of this is sending attachments information over to the foreign region.

As destination of teleport

• Verify's user agent with source installation's User Agent service.

Viewer

• Speaks to the current and target simulators using LLUDP and capabilities.
• No interation with grid services to complete teleport.

Protocol Flow

Teleport of an agent into a foreign grid

• Gatekeeper service receives a request from the source grid for information about a region with a given UUID.
• Gatekeeper service receives login request for a given agent (e.g. Joe Bloggs @ http://grid-source.com:8002).
• Gatekeeper service authenticates with source grid's User Agent service that user agent originates from there.
• Gatekeeper service notifies destination region that a connection is incoming.
• Destination region waits for initial client seed capabilities connection.
  • On receipt verifies client with source grid's User Agent service that user agent originates from there.
• Receives incoming attachments for foreign agent.