MarcoPolo / js-ipfs-bitswap

JavaScript implementation of Bitswap 'data exchange' protocol used by IPFS

ipfs-bitswap

JavaScript implementation of the Bitswap data exchange protocol used by IPFS

Table of contents

• Install
  • Browser <script> tag
• Stats
  • Peer accessor:
  • Global snapshot accessor:
  • Moving average accessor:
• Performance tests
  • Profiling
• API Docs
• License
• Contribute

Install

$ npm i ipfs-bitswap

Browser <script> tag

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

<script src="https://unpkg.com/ipfs-bitswap/dist/index.min.js"></script>

Stats

const bitswapNode = // ...

const stats = bitswapNode.stats

Stats contains a snapshot accessor, a moving average acessor and a peer accessor.

Besides that, it emits "update" events every time it is updated.

stats.on('update', (stats) => {
  console.log('latest stats snapshot: %j', stats)
})

Peer accessor:

You can get the stats for a specific peer by doing:

const peerStats = stats.forPeer(peerId)

The returned object behaves like the root stats accessor (has a snapshot, a moving average accessors and is an event emitter).

Global snapshot accessor:

const snapshot = stats.snapshot
console.log('stats: %j', snapshot)

the snapshot will contain the following keys, with the values being bignumber.js instances:

// stats: {
//   "dataReceived":"96",
//   "blocksReceived":"2",
//   "dataReceived":"96",
//   "dupBlksReceived":"0",
//   "dupDataReceived":"0",
//   "blocksSent":"0",
//   "dataSent":"0",
//   "providesBufferLength":"0",
//   "wantListLength":"0",
//   "peerCount":"1"
// }

Moving average accessor:

const movingAverages = stats.movingAverages

This object contains these properties:

• 'blocksReceived',
• 'dataReceived',
• 'dupBlksReceived',
• 'dupDataReceived',
• 'blocksSent',
• 'dataSent',
• 'providesBufferLength',
• 'wantListLength',
• 'peerCount'

const dataReceivedMovingAverages = movingAverages.dataReceived

Each one of these will contain one key per interval (miliseconds), being the default intervals defined:

• 60000 (1 minute)
• 300000 (5 minutes)
• 900000 (15 minutes)

You can then select one of them

const oneMinuteDataReceivedMovingAverages = dataReceivedMovingAverages[60000]

This object will be a movingAverage instance.

Performance tests

You can run performance tests like this:

$ npm run benchmarks

Profiling

You can run each of the individual performance tests with a profiler like 0x.

To do that, you need to install 0x:

$ npm install 0x --global

And then run the test:

$ 0x test/benchmarks/get-many

This will output a flame graph and print the location for it. Use the browser Chrome to open and inspect the generated graph.

API Docs

• https://ipfs.github.io/js-ipfs-bitswap

License

Licensed under either of

• Apache 2.0, (LICENSE-APACHE / http://www.apache.org/licenses/LICENSE-2.0)
• MIT (LICENSE-MIT / http://opensource.org/licenses/MIT)

Contribute

Contributions welcome! Please check out the issues.

Also see our contributing document for more information on how we work, and about contributing in general.

Please be aware that all interactions related to this repo are subject to the IPFS Code of Conduct.

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.