simple-block-stream

A simple way to stream blockchains with webcoin

This library makes it easy to stream blockchains with webcoin. It provides sensible defaults for most behavior and parameters.

Usage

npm install simple-block-stream

This library uses debug; set the env var DEBUG to simple-block-stream to see debug logs.

Options:

• db (required): a LevelUp database
• addresses: an array of addresses to include (default [])
• unfiltered: if true, include all addresses (default false)
• from: include blocks starting at this height (default 0)
• params: the params of the blockchain (default Bitcoin mainnet)
• network: the network of the blockchain (default Bitcoin mainnet)
• peer: the PeerGroup of the blockchain (default Bitcoin mainnet)
• json: if true, produce JSON-serializable objects (default false)

var SimpleBlockStream = require('simple-block-stream')

var memdb = require('memdb')

var sbs = SimpleBlockStream({
  db: memdb(),
  addresses: ['1LNWw6yCxkUmkhArb2Nf2MPw6vG7u5WG7q']
})

// print to the console when we see a block
sbs.stream.on('data', function (block) {
  if (block.transactions.length) {
    console.log('txs:', block.transactions)
  }
})

Call sbs.close when you're done.

Fixtures

You can use fixtures to make your unit tests fast and reliable.

Use the make-fixture binary to save a fixture:

make-fixture --outputPath fixture.json --fixtureHeight 1000

Use the fromFixture method to read a fixture out. The fixture acts just like a SimpleBlockStream.

var SimpleBlockStream = require('simple-block-stream')
SimpleBlockStream.fromFixture({inputPath: 'fixture.json'}).stream.on('data', console.log)