2.0.10 • Published 8 months ago

@libp2p/dcutr v2.0.10

Weekly downloads
-
License
Apache-2.0 OR MIT
Repository
github
Last release
8 months ago

@libp2p/dcutr

libp2p.io Discuss codecov CI

Implementation of the DCUtR Protocol

About

Direct Connection Upgrade through Relay (DCUtR) is a protocol that allows two nodes to connect to each other who would otherwise be prevented doing so due to being behind NATed connections or firewalls.

The protocol involves making a relayed connection between the two peers and using the relay to synchronise connection timings so that they dial each other at precisely the same moment.

Example

import { createLibp2p } from 'libp2p'
import { circuitRelayTransport } from '@libp2p/circuit-relay-v2'
import { tcp } from '@libp2p/tcp'
import { identify } from '@libp2p/identify'
import { dcutr } from '@libp2p/dcutr'
import { multiaddr } from '@multiformats/multiaddr'

const node = await createLibp2p({
  transports: [
    circuitRelayTransport(),
    tcp()
  ],
  services: {
    identify: identify(),
    dcutr: dcutr()
  }
})

// QmTarget is a peer that is behind a NAT, supports TCP and has a relay
// reservation
const ma = multiaddr('/ip4/.../p2p/QmRelay/p2p-circuit/p2p/QmTarget')
await node.dial(ma)

// after a while the connection should automatically get upgraded to a
// direct connection (e.g. non-limited)
while (true) {
  const connections = node.getConnections()

  if (connections.find(conn => conn.limits == null)) {
    console.info('have direct connection')
    break
  } else {
    console.info('have relayed connection')

    // wait a few seconds to see if it's succeeded yet
    await new Promise<void>((resolve) => {
      setTimeout(() => resolve(), 5000)
    })
  }
}

Install

$ npm i @libp2p/dcutr

Browser <script> tag

Loading this module through a script tag will make it's exports available as Libp2pDcutr in the global namespace.

<script src="https://unpkg.com/@libp2p/dcutr/dist/index.min.js"></script>

API Docs

License

Licensed under either of

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

@libp2p/interface@libp2p/interface-internal@libp2p/utils@multiformats/multiaddr@multiformats/multiaddr-matcherdelayit-protobuf-streamprotons-runtimeuint8arraylist
@everything-registry/sub-chunk-546@blockless/browser-node@rosen-bridge/rosenet-nodeipfs-nodeipdw@carmel/core@constl/ipawebpeerjs@libp2p/amino-dht-bootstrapperhelia@turbo-ing/edge-v0@ts-drp/network@topology-foundation/network@sfroment/network@soketi/p2p
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