topology

interface-topology

Implementation of the topology interface used by the js-libp2p registrar.

Topologies can be used in conjunction with js-libp2p to help shape its network and the overlays of its subsystems, such as pubsub and the DHT.

Table of Contents

• Implementations
• Install
• Modules using the interface
• Usage
• Api

Implementations

Topology

A libp2p topology with a group of common peers.

Multicodec Topology

A libp2p topology with a group of peers that support the same protocol.

Install

$ npm install libp2p-interfaces

Modules using the interface

TBA

Usage

Topology

const Topology = require('libp2p-interfaces/src/topology')

const toplogy = new Topology({
  min: 0,
  max: 50
})

Multicodec Topology

const MulticodecTopology = require('libp2p-interfaces/src/topology/multicodec-topology')

const toplogy = new MulticodecTopology({
  min: 0,
  max: 50,
  multicodecs: ['/echo/1.0.0'],
  handlers: {
    onConnect: (peerId, conn) => {},
    onDisconnect: (peerId) => {}
  }
})

API

The MulticodecTopology extends the Topology, which makes the Topology API a subset of the MulticodecTopology API.

Topology

• Topology
  • peers<Map<string, PeerId>>: A Map of peers belonging to the topology.
  • disconnect<function(PeerId)>: Called when a peer has been disconnected

Constructor

const toplogy = new Topology({
  min: 0,
  max: 50,
  handlers: {
    onConnect: (peerId, conn) => {},
    onDisconnect: (peerId) => {}
  }
})

Parameters

• properties is an Object containing the properties of the topology.
  • min is a number with the minimum needed connections (default: 0)
  • max is a number with the maximum needed connections (default: Infinity)
  • handlers is an optional Object containing the handler called when a peer is connected or disconnected.
    • onConnect is a function called everytime a peer is connected in the topology context.
    • onDisconnect is a function called everytime a peer is disconnected in the topology context.

Set a peer

• topology.peers.set(id, peerId)

Add a peer to the topology.

Parameters

• id is the string that identifies the peer to add.
• peerId is the PeerId of the peer to add.

Notify about a peer disconnected event

• topology.disconnect(peerId)

Parameters

• peerId is the PeerId of the peer disconnected.

Multicodec Topology

• MulticodecTopology
  • registrar<Registrar>: The Registrar of the topology. This is set by the Registrar during registration.
  • peers<Map<string, PeerId>>: The Map of peers that belong to the topology
  • disconnect<function(PeerId)>: Disconnects a peer from the topology.

Constructor

const toplogy = new MulticodecTopology({
  min: 0,
  max: 50,
  multicodecs: ['/echo/1.0.0'],
  handlers: {
    onConnect: (peerId, conn) => {},
    onDisconnect: (peerId) => {}
  }
})

Parameters

• properties is an Object containing the properties of the topology.
  • min is a number with the minimum needed connections (default: 0)
  • max is a number with the maximum needed connections (default: Infinity)
  • multicodecs is a Array<String> with the multicodecs associated with the topology.
  • handlers is an optional Object containing the handler called when a peer is connected or disconnected.
    • onConnect is a function called everytime a peer is connected in the topology context.
    • onDisconnect is a function called everytime a peer is disconnected in the topology context.