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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/bitcoin-s/bitcoin-s/blob/master/docs/node/node.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Light Client</h1></header><article><div><span><p>Bitcoin-s has node module that allows you to connect to the p2p network.</p>
<h3><a class="anchor" aria-hidden="true" id="neutrino-node"></a><a href="#neutrino-node" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Neutrino Node</h3>
<p>Bitcoin-s has experimental support for neutrino which is a new lite client proposal on the bitcoin p2p network. You can
read more about how neutrino works <a href="https://suredbits.com/neutrino-what-is-it-and-why-we-need-it/">here</a>. At this time,
bitcoin-s only supports connecting to one trusted peer.</p>
<h4><a class="anchor" aria-hidden="true" id="limitations"></a><a href="#limitations" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Limitations</h4>
<p>Currently, the node does not have an active mempool.
It is only aware of transactions it broadcasts and ones confirmed in blocks.</p>
<h4><a class="anchor" aria-hidden="true" id="callbacks"></a><a href="#callbacks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Callbacks</h4>
<p>Bitcoin-S support call backs for the following events that happen on the bitcoin p2p network:</p>
<ol>
<li>onTxReceived</li>
<li>onBlockReceived</li>
<li>onMerkleBlockReceived</li>
<li>onCompactFilterReceived</li>
</ol>
<p>That means every time one of these events happens on the p2p network, we will call your callback
so that you can be notified of the event. These callbacks will be run after the message has been
recieved and will execute sequentially. If any of them fail an error log will be output and the remainder of the callbacks will continue.
Let's make an easy one</p>
<h4><a class="anchor" aria-hidden="true" id="example"></a><a href="#example" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example</h4>
<p>Here is an example of constructing a neutrino node and registering a callback so you can be notified of an event.</p>
<p>To run the example, we need a bitcoind binary that has neutrino support.
Bitcoin Core only has p2p neutrino support as of version 0.21.0.
You will need to use a version of Bitcoin Core at least as old as 0.21.0.
For your node to be able to service these filters you will need set
<code>blockfilterindex=1</code> and <code>peerblockfilters=1</code> in your <code>bitcoin.conf</code> file.</p>
<pre><code class="hljs css language-scala">implicit val system: ActorSystem = ActorSystem(s"node-example")
implicit val ec: ExecutionContext = system.dispatcher
//we also require a bitcoind instance to connect to
//so let's start one (make sure you ran 'sbt downloadBitcoind')
val instance = BitcoindRpcTestUtil.instance(versionOpt = Some(BitcoindVersion.newest))
val p2pPort = instance.p2pPort
val bitcoindF = BitcoindRpcTestUtil.startedBitcoindRpcClient(Some(instance), Vector.newBuilder)
//contains information on how to connect to bitcoin's p2p info
val peerF = bitcoindF.flatMap(b =&gt; NodeUnitTest.createPeer(b))
// set a data directory
val prefix = s"node-example-${System.currentTimeMillis()}"
val datadir = Files.createTempDirectory(prefix)
val tmpDir = BitcoinSTestAppConfig.tmpDir()
// set the current network to regtest
val config = ConfigFactory.parseString {
s"""
| bitcoin-s {
| network = regtest
| node {
| mode = neutrino # neutrino, spv
|
| peers = ["127.0.0.1:$p2pPort"] # a list of peer addresses in form "hostname:portnumber"
| # (e.g. "neutrino.testnet3.suredbits.com:18333")
| # Port number is optional, the default value is 8333 for mainnet,
| # 18333 for testnet and 18444 for regtest.
| }
| }
|""".stripMargin
}
implicit val appConfig: BitcoinSAppConfig = BitcoinSAppConfig(datadir, Vector(config))
implicit val chainConfig: ChainAppConfig = appConfig.chainConf
implicit val nodeConfig: NodeAppConfig = appConfig.nodeConf
val initNodeF = nodeConfig.start()
//yay! All setup done, let's create a node and then start it!
val nodeF = for {
peer &lt;- peerF
} yield {
NeutrinoNode(
walletCreationTimeOpt = None, //you can set this to only sync compact filters after the timestamp
paramPeers = Vector(peer),
nodeConfig = nodeConfig,
chainConfig = chainConfig,
actorSystem = system)
}
//let's start it
val startedNodeF = nodeF.flatMap(_.start())
//let's make a simple callback that print's the
//blockhash everytime we receive a block on the network
val blockReceivedFunc: OnBlockReceived = { (block: Block) =&gt;
Future.successful(
println(s"Received blockhash=${block.blockHeader.hashBE}"))
}
// Create callback
val nodeCallbacks = NodeCallbacks.onBlockReceived(blockReceivedFunc)
// Add call to our node's config
nodeConfig.addCallbacks(nodeCallbacks)
//let's test it out by generating a block with bitcoind!
val genBlockF = for {
bitcoind &lt;- bitcoindF
addr &lt;- bitcoind.getNewAddress
hashes &lt;- bitcoind.generateToAddress(1,addr)
} yield hashes
//you should see our callback print a block hash
//when running this code
//cleanup
val cleanupF = for {
_ &lt;- genBlockF
bitcoind &lt;- bitcoindF
node &lt;- startedNodeF
x = NeutrinoNodeConnectedWithBitcoind(node.asInstanceOf[NeutrinoNode],bitcoind)
_ &lt;- NodeUnitTest.destroyNodeConnectedWithBitcoind(x)
} yield ()
Await.result(cleanupF, 60.seconds)
</code></pre>
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