dknowledgr

Robust dknowledgr blockchain client library that runs in both node.js and the browser.

• Demo (source)
• Code playground
• Documentation
• Bug tracker

note As of version 0.7.0 WebSocket support has been removed. The only transport provided now is HTTP(2). For most users the only change required is to swap wss:// to https:// in the address. If you run your own full node make sure to set the proper CORS headers if you plan to access it from a browser.

Browser compatibility

Installation

Via npm

For node.js or the browser with browserify or webpack.

npm install dknowledgr

From cdn or self-hosted script

Grab dist/dsteem.js from a release and include in your html:

<script src="dsteem.js"></script>

Or from the unpkg cdn:

<script src="https://unpkg.com/dknowledgr@^0.8.0/dist/dsteem.js"></script>

Make sure to set the version you want when including from the cdn, you can also use dknowledgr@latest but that is not always desirable. See unpkg.com for more information.

Usage

In the browser

<script src="https://unpkg.com/dknowledgr@latest/dist/dsteem.js"></script>
<script>
    var client = new dsteem.Client('https://api.steemit.com')
    client.database.getDiscussions('trending', {tag: 'writing', limit: 1}).then(function(discussions){
        document.body.innerHTML += '<h1>' + discussions[0].title + '</h1>'
        document.body.innerHTML += '<h2>by ' + discussions[0].author + '</h2>'
        document.body.innerHTML += '<pre style="white-space: pre-wrap">' + discussions[0].body + '</pre>'
    })
</script>

See the demo source for an example on how to setup a livereloading TypeScript pipeline with wintersmith and browserify.

In node.js

With TypeScript:

import {Client} from 'dknowledgr'

const client = new Client('https://api.steemit.com')

for await (const block of client.blockchain.getBlocks()) {
    console.log(`New block, id: ${ block.block_id }`)
}

With JavaScript:

var dknowledgr = require('dknowledgr')

var client = new dknowledgr.Client('https://api.steemit.com')
var key = dknowledgr.PrivateKey.fromLogin('username', 'password', 'posting')

client.broadcast.vote({
    voter: 'username',
    author: 'almost-digital',
    permlink: 'dknowledgr-is-the-best',
    weight: 10000
}, key).then(function(result){
   console.log('Included in block: ' + result.block_num)
}, function(error) {
   console.error(error)
})

With ES2016 (node.js 7+):

const {Client} = require('dknowledgr')

const client = new Client('https://api.steemit.com')

async function main() {
    const props = await client.database.getChainProperties()
    console.log(`Maximum blocksize consensus: ${ props.maximum_block_size } bytes`)
    client.disconnect()
}

main().catch(console.error)

With node.js streams:

var dknowledgr = require('dknowledgr')
var es = require('event-stream') // npm install event-stream
var util = require('util')

var client = new dknowledgr.Client('https://api.steemit.com')

var stream = client.blockchain.getBlockStream()

stream.pipe(es.map(function(block, callback) {
    callback(null, util.inspect(block, {colors: true, depth: null}) + '\n')
})).pipe(process.stdout)

Bundling

The easiest way to bundle dknowledgr (with browserify, webpack etc.) is to just npm install dknowledgr and require('dknowledgr') which will give you well-tested (see browser compatibility matrix above) pre-bundled code guaranteed to JustWork™. However, that is not always desirable since it will not allow your bundler to de-duplicate any shared dependencies dknowledgr and your app might have.

To allow for deduplication you can require('dknowledgr/lib/index-browser'), or if you plan to provide your own polyfills: require('dknowledgr/lib/index'). See src/index-browser.ts for a list of polyfills expected.

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