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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>
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<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>
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<p>Bitcoin-s has experimental support for neutrino which is a new lite client proposal on the bitcoin p2p network. You can
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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,
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bitcoin-s only supports connecting to one trusted peer.</p>
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<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>
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<p>Currently, the node does not have an active mempool.
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It is only aware of transactions it broadcasts and ones confirmed in blocks.</p>
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<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>
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<p>Bitcoin-S support call backs for the following events that happen on the bitcoin p2p network:</p>
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<ol>
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<li>onTxReceived</li>
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<li>onBlockReceived</li>
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<li>onMerkleBlockReceived</li>
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<li>onCompactFilterReceived</li>
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</ol>
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<p>That means every time one of these events happens on the p2p network, we will call your callback
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so that you can be notified of the event. These callbacks will be run after the message has been
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recieved and will execute sequentially. If any of them fail an error log will be output and the remainder of the callbacks will continue.
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Let's make an easy one</p>
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<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>
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<p>Here is an example of constructing a neutrino node and registering a callback so you can be notified of an event.</p>
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<p>To run the example, we need a bitcoind binary that has neutrino support.
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Bitcoin Core only has p2p neutrino support as of version 0.21.0.
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You will need to use a version of Bitcoin Core at least as old as 0.21.0.
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For your node to be able to service these filters you will need set
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<code>blockfilterindex=1</code> and <code>peerblockfilters=1</code> in your <code>bitcoin.conf</code> file.</p>
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<pre><code class="hljs css language-scala">implicit val system: ActorSystem = ActorSystem(s"node-example")
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implicit val ec: ExecutionContext = system.dispatcher
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//we also require a bitcoind instance to connect to
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//so let's start one (make sure you ran 'sbt downloadBitcoind')
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val instance = BitcoindRpcTestUtil.instance(versionOpt = Some(BitcoindVersion.newest))
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val p2pPort = instance.p2pPort
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val bitcoindF = BitcoindRpcTestUtil.startedBitcoindRpcClient(Some(instance), Vector.newBuilder)
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//contains information on how to connect to bitcoin's p2p info
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val peerF = bitcoindF.flatMap(b => NodeUnitTest.createPeer(b))
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// set a data directory
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val prefix = s"node-example-${System.currentTimeMillis()}"
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val datadir = Files.createTempDirectory(prefix)
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val tmpDir = BitcoinSTestAppConfig.tmpDir()
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// set the current network to regtest
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val config = ConfigFactory.parseString {
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s"""
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| bitcoin-s {
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| network = regtest
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| node {
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| mode = neutrino # neutrino, spv
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|
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| peers = ["127.0.0.1:$p2pPort"] # a list of peer addresses in form "hostname:portnumber"
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| # (e.g. "neutrino.testnet3.suredbits.com:18333")
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| # Port number is optional, the default value is 8333 for mainnet,
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| # 18333 for testnet and 18444 for regtest.
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| }
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| }
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|""".stripMargin
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}
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implicit val appConfig: BitcoinSAppConfig = BitcoinSAppConfig(datadir, Vector(config))
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implicit val chainConfig: ChainAppConfig = appConfig.chainConf
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implicit val nodeConfig: NodeAppConfig = appConfig.nodeConf
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val initNodeF = nodeConfig.start()
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//yay! All setup done, let's create a node and then start it!
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val nodeF = for {
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peer <- peerF
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} yield {
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NeutrinoNode(
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walletCreationTimeOpt = None, //you can set this to only sync compact filters after the timestamp
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paramPeers = Vector(peer),
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nodeConfig = nodeConfig,
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chainConfig = chainConfig,
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actorSystem = system)
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}
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//let's start it
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val startedNodeF = nodeF.flatMap(_.start())
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//let's make a simple callback that print's the
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//blockhash everytime we receive a block on the network
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val blockReceivedFunc: OnBlockReceived = { (block: Block) =>
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Future.successful(
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println(s"Received blockhash=${block.blockHeader.hashBE}"))
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}
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// Create callback
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val nodeCallbacks = NodeCallbacks.onBlockReceived(blockReceivedFunc)
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// Add call to our node's config
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nodeConfig.addCallbacks(nodeCallbacks)
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//let's test it out by generating a block with bitcoind!
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val genBlockF = for {
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bitcoind <- bitcoindF
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addr <- bitcoind.getNewAddress
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hashes <- bitcoind.generateToAddress(1,addr)
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} yield hashes
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//you should see our callback print a block hash
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//when running this code
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//cleanup
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val cleanupF = for {
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_ <- genBlockF
|
||
bitcoind <- bitcoindF
|
||
node <- startedNodeF
|
||
x = NeutrinoNodeConnectedWithBitcoind(node.asInstanceOf[NeutrinoNode],bitcoind)
|
||
_ <- NodeUnitTest.destroyNodeConnectedWithBitcoind(x)
|
||
} yield ()
|
||
|
||
Await.result(cleanupF, 60.seconds)
|
||
</code></pre>
|
||
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