In this section you will find a representation of the Decentraland Architecture and references to all the Open Source repositories that make part of it. In each repository you will be able to find more details about the component and how to use it.
- Catalyst Client
- Web Browser
- Explorer Website
- Scene Runtime
A Catalyst is a server that bundles different services. These services currently work as the backbone for Decentraland and run the decentralized storage for most of the content needed by the client and orchestrate the communications between peers. The projects that are part of this bundle are the following:
Backend for Frontend (BFF) #
This service was created to resolve client needs to enable faster development of new features without breaking the existing APIs. In the Catalyst context, it’s used for the communications between peers connected to the client, its main responsibility is to manage the P2P signaling.
Archipelago Service #
Previously Archipelago was a library used by the Lighthouse, as now it needs to work with the different transports beyond P2P, it was converted into a Service. This service will have the same responsibility that the library did: group peers in clusters so they can communicate efficiently. On the other hand, the service will also need to be able to balance islands using the available transports and following a set of Catalyst Owner defined rules, in order to, for example, use LiveKit for an island in the Casino and P2P in a Plaza.
NATS is a message broker that enables the data exchange and communication between services. This is also a building block for future developments and will enable an easy way to connect services using subject-based messaging. In the context of the communication services architecture, it is used to communicate the BFF, Archipelago and LiveKit.
Learn more: https://nats.io/
LiveKit is an open source project that provides scalable, multi-user conferencing over WebRTC. Instead of doing a P2P network, peers are connected to a Selective Forwarding Unit (SFU) in charge of managing message relay and different quality aspects of the communication. This will be the added infrastructure in order to provide high-performance/high-quality communications between crowds on designated scenes.
This service provides a set of utilities required by the Catalyst Server Clients/Consumers in order to retrieve or validate data. Some of the validations run in these functions are ownership related and for that it uses The Graph to query the blockchain.
Content Server #
The Content Server currently stores all the Entities used in Decentraland. For example scenes, wearables and profiles. Content servers will automatically sync with each other, as long as they were all approved by the DAO.
Nginx is the reverse proxy used to route traffic to the Catalysts Services.
This CLI provides tooling/commands to assist you in the scenes development process. Some of the commands will help you scaffold a new scene project, locally start and visualize the scene in order to test it and deploy it to a content server to be incorporated in your Decentraland parcel.
- CLI Source Code: https://github.com/decentraland/cli
- Examples and Tutorials: https://github.com/decentraland-scenes/Awesome-Repository
Catalyst Client #
This client library can be used to interact with Decentraland’s Catalyst servers. You can both fetch data, or deploy new entities to the server you specify.
Web Browser #
- Explorer https://github.com/decentraland/explorer
- Kernel https://github.com/decentraland/kernel
- Peer library https://github.com/decentraland/catalyst-comms-peer
Peer Library #
The Peer Library manages Websocket connections for WebRTC signaling, Islands, Notifications and Location Data and WebRTC Connections for peers positions, scene bus, global chat and voice chat (private chat goes through the Matrix Synapse Server and the Matrix Client).
Kernel - Voice Chat Module #
This Module is the codec to hook WebAudio & Worklets to comms
Kernel - Client Comms #
Abstraction over the Communication Protocol
Kernel - Scene Loader System #
Module that loads and unloads the scenes/parcels based on user position.
Kernel - Scene #
High level wrapper around the runtime scene
Kernel - Avatar Scene #
It is a regular Decentraland Scene, it has the size of the world. And it renders the avatars using the SDK
Matrix Client #
The Matrix Client can be used to interact Decentraland’s users, providing the ability to send private messages and add people as friends.
Like an ESB. Everything is connected to Sagas
Synapse server is an implementation of the Matrix Protocol, created for secure, decentralized communications. In the context of Decentraland it is used to manage private chats between peers and friendships.
Explorer Website #
REACT Application to load Kernel and Renderer
Scene Runtime #
Kernel - Runtime #
The Runtime handles SDK bindings and messaging with the Scene in Kernel
Compiler Bundle #
This Module manages loading of RPC modules to interact with different components of Decentraland
The public library to interact with Decentraland. Sometimes people refers to the ECS as “The SDK”
User Code #
The user generated code is part of the bundle of the Scenes