1. 首页
  2. 官方更新
  3. IPFS

Distributed pubsub primitives for js-ipfs in the Browser

IPFS pubsub was first introduced in September 2016 behind an experimental flag. This initial implementation allowed orbit, a chat application built on top of IPFS, to become fully distributed. @haadcode presented that work at DEVCON2. Later, the IPFS team announced that pubsub was ready for the whole community to use.

In this post I’ll show you how to use pubsub with the JavaScript implementation of IPFS. I start by using the pubsub primitives available in js-ipfs and end with a new module plus video tutorial of how to use it. Make sure to read to the end!

Using pubsub on js-ipfs

IPFS is not just a filesystem. It’s a complete stack for decentralized applications. With pubsub, an IPFS node can show interest in a topic (a string representing a pubsub channel) and is able to listen and send messages on that topic in a way that is decentralized – it does not rely on any mediating server or special node.

With js-ipfs, this code works today in any modern browser. By instantiating an IPFS node in JavaScript and activating the pubsub feature, you can send and receive messages between nodes.

Here we include the js-ipfs library (which you need to have previously installed) and created an IPFS that has the experimental pubsub feature enabled:

const IPFS = require('ipfs')  // create IPFS node const ipfs = new IPFS({   EXPERIMENTAL: {     pubsub: true // required, enables pubsub   } })  ipfs.once('ready', () => {   // node is ready }) 

Now we’re ready to receive messages on a topic:

ipfs.pubsub.subscribe('topic-name-here', (message) => {   console.log('got message from ' + message.from)    // data is a buffer. Here we're converting it into a string    const data = message.data.toString()   console.log('containing data: ' + data) }) 

And we can also send messages:

// data should be a buffer const data = Buffer.from('some message content here')  ipfs.pubsub.publish('topic-name-here', data, (err) => {   if (err) {     console.error('error publishing: ', err)   } else {     console.log('successfully published message')   } }) 

Even though the js-IPFS pubsub API is very simple to use, you will need some additional functionality for most uses. If you want to be able to deal with strings, send private messages to a specific peer and be notified of subscription changes (nodes that are interested in the topic), take a look at the ipfs-pubsub-room package.

Enter ipfs-pubsub-room

ipfs-pubsub-room is a room-oriented take on the pubsub API for IPFS. It’s being built in the ipfs-shipyard. See the full tutorial below:

Happy decentralized messaging! 🎉


官方原文:https://blog.ipfs.io/29-js-ipfs-pubsub

原创文章,作者:点对点Tech,如若转载,请注明出处:https://ipfsdrop.com/offcial/ipfs/distributed-pubsub-primitives-for-js-ipfs-in-the-browser/

发表评论

电子邮件地址不会被公开。 必填项已用*标注

联系我们

(+86)18301922335

在线咨询:点击这里给我发消息

邮件:haskell@freechains.cn

工作时间:7×24小时

QR code