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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/config/configuration.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Application Configuration</h1></header><article><div><span><p>Bitcoin-S uses <a href="https://github.com/lightbend/config/blob/master/HOCON.md">HOCON</a>
to configure various parts of the application the library offers. HOCON is a
superset of JSON, that is, all valid JSON is valid HOCON.</p>
<p>All configuration for Bitcoin-S is under the <code>bitcoin-s</code> key.</p>
<p>If you have a file <code>application.conf</code> anywhere on your classpath when using
bitcoin-s, the values there take precedence over the ones found in our
<code>reference.conf</code>. We also look for the file <code>bitcoin-s.conf</code> in the current
Bitcoin-S data directory.</p>
<p>The resolved configuration gets parsed by
<a href="../../db-commons/src/main/scala/org/bitcoins/db/AppConfig.scala"><code>AppConfig</code></a>.
<code>AppConfig</code> is an abstract class that's implemented by corresponding case
classes in the <code>wallet</code>, <code>chain</code> and <code>node</code> projects. Here's some examples of how to
construct a wallet configuration:</p>
<pre><code class="hljs css language-scala"><span class="hljs-keyword">import</span> org.bitcoins.wallet.config.<span class="hljs-type">WalletAppConfig</span>
<span class="hljs-keyword">import</span> com.typesafe.config.<span class="hljs-type">ConfigFactory</span>
<span class="hljs-keyword">import</span> java.nio.file.<span class="hljs-type">Paths</span>
<span class="hljs-keyword">import</span> scala.util.<span class="hljs-type">Properties</span>
<span class="hljs-comment">// reads $HOME/.bitcoin-s/</span>
<span class="hljs-keyword">val</span> defaultConfig = <span class="hljs-type">WalletAppConfig</span>.fromDefaultDatadir()
<span class="hljs-comment">// reads a custom data directory</span>
<span class="hljs-keyword">val</span> customDirectory = <span class="hljs-type">Paths</span>.get(<span class="hljs-type">Properties</span>.userHome, <span class="hljs-string">&quot;custom-bitcoin-s-directory&quot;</span>)
<span class="hljs-keyword">val</span> configFromCustomDatadir = <span class="hljs-type">WalletAppConfig</span>(customDirectory)
<span class="hljs-comment">// reads a custom data directory and overrides the network to be testnet3</span>
<span class="hljs-keyword">val</span> customOverride = <span class="hljs-type">ConfigFactory</span>.parseString(<span class="hljs-string">&quot;bitcoin-s.network = testnet3&quot;</span>)
<span class="hljs-keyword">val</span> configFromCustomDirAndOverride = <span class="hljs-type">WalletAppConfig</span>(customDirectory, customOverride)
</code></pre>
<p>You can pass as many <code>com.typesafe.config.Config</code>s as you'd like. If any
keys appear multiple times the last one encountered takes precedence.</p>
<h2><a class="anchor" aria-hidden="true" id="internal-configuration"></a><a href="#internal-configuration" 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>Internal configuration</h2>
<p>Database connections are also configured by using HOCON. This is done in
<a href="../../db-commons/src/main/resources/db.conf"><code>db.conf</code></a>. The options
exposed here are <strong>not</strong> intended to
be used by users of Bitcoin-S, and are internal only.</p>
<h2><a class="anchor" aria-hidden="true" id="database-migrations"></a><a href="#database-migrations" 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>Database Migrations</h2>
<p>All of our modules that require databases now have database migrations. The tool we use for these migrations is
called <a href="https://flywaydb.org/">flyway</a>. To find your projects migraitons, you need to look inside of the
<code>[project-name]/src/main/resources/[database-name]/migration/</code>. For example, the chain projects migrations live under
the path <code>chain/src/main/resources/chaindb/migration/V1__chain_db_baseline.sql</code>.</p>
<p>Migrations can be executed by calling the <a href="https://github.com/bitcoin-s/bitcoin-s/blob/e387d075b0ff2e0a0fec15788fcb48e4ddc4d9d5/db-commons/src/main/scala/org/bitcoins/db/DbManagement.scala#L92"><code>DbManagement.migrate()</code></a>
method. Migrations are applied by default on server startup, via the <a href="https://github.com/bitcoin-s/bitcoin-s/blob/master/db-commons/src/main/scala/org/bitcoins/db/AppConfig.scala#L49"><code>AppConfig.initialize()</code></a>
method.</p>
<p>These migrations are setup so that project's databases and migrations are independent of each other. Therefore if you
want to use the <code>bitcoin-s-chain</code> project, but not the <code>bitcoin-s-wallet</code> project, wallet migrations are not applied.
It should be noted if you are using a module as a library, you are responsible for configuring the database via
<a href="https://scala-slick.org/doc/3.3.1/database.html#using-typesafe-config">slick's configuration</a> and calling
<a href="https://github.com/bitcoin-s/bitcoin-s/blob/master/db-commons/src/main/scala/org/bitcoins/db/AppConfig.scala#L49"><code>AppConfig.initialize()</code></a>
to ensure the entire module is initialized correctly.</p>
<h2><a class="anchor" aria-hidden="true" id="example-configuration-file"></a><a href="#example-configuration-file" 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 Configuration File</h2>
<pre><code class="hljs css language-$xslt">bitcoin-s {
<span class="hljs-attr">datadir</span> = ${HOME}/.bitcoin-s
<span class="hljs-attr">network</span> = regtest <span class="hljs-comment"># regtest, testnet3, mainnet</span>
logging {
<span class="hljs-attr">level</span> = WARN <span class="hljs-comment"># trace, debug, info, warn, error, off</span>
<span class="hljs-comment"># You can also tune specific module loggers.</span>
<span class="hljs-comment"># They each take the same levels as above.</span>
<span class="hljs-comment"># If they are commented out (as they are</span>
<span class="hljs-comment"># by default), `logging.level` gets used</span>
<span class="hljs-comment"># instead. </span>
<span class="hljs-comment"># The available loggers are: </span>
<span class="hljs-comment"># incoming and outgoing P2P messages</span>
<span class="hljs-comment"># p2p = info</span>
<span class="hljs-comment"># verification of block headers, merkle trees</span>
<span class="hljs-comment"># chain-verification = info</span>
<span class="hljs-comment"># generation of addresses, signing of TXs</span>
<span class="hljs-comment"># key-handling = info</span>
<span class="hljs-comment"># wallet operations not related to key management</span>
<span class="hljs-comment"># wallet = info</span>
<span class="hljs-comment"># HTTP RPC server</span>
<span class="hljs-comment"># http = info</span>
<span class="hljs-comment"># Database interactions</span>
<span class="hljs-comment"># database = info</span>
<span class="hljs-comment"># whether or not to write to the log file</span>
<span class="hljs-attr">disable-file</span> = <span class="hljs-literal">false</span>
<span class="hljs-comment"># whether or not to log to stdout </span>
<span class="hljs-attr">disable-console</span> = <span class="hljs-literal">false</span>
}
node {
<span class="hljs-attr">mode</span> = neutrino <span class="hljs-comment"># neutrino, spv</span>
<span class="hljs-attr">peers</span> = [] <span class="hljs-comment"># a list of peer addresses in form &quot;hostname:portnumber&quot;</span>
<span class="hljs-comment"># (e.g. &quot;neutrino.testnet3.suredbits.com:18333&quot;)</span>
<span class="hljs-comment"># Port number is optional, the default value is 8333 for mainnet,</span>
<span class="hljs-comment"># 18333 for testnet and 18444 for regtest.</span>
}
chain {
neutrino {
<span class="hljs-attr">filter-header-batch-size</span> = <span class="hljs-number">2000</span>
<span class="hljs-attr">filter-batch-size</span> = <span class="hljs-number">100</span>
}
}
<span class="hljs-comment"># settings for wallet module</span>
wallet {
<span class="hljs-attr">defaultAccountType</span> = legacy <span class="hljs-comment"># legacy, segwit, nested-segwit</span>
<span class="hljs-attr">bloomFalsePositiveRate</span> = <span class="hljs-number">0.0001</span> <span class="hljs-comment"># percentage</span>
<span class="hljs-attr">addressGapLimit</span> = <span class="hljs-number">20</span>
<span class="hljs-attr">discoveryBatchSize</span> = <span class="hljs-number">100</span>
}
}
akka {
<span class="hljs-attr">loglevel</span> = <span class="hljs-string">&quot;OFF&quot;</span>
<span class="hljs-attr">stdout-loglevel</span> = <span class="hljs-string">&quot;OFF&quot;</span>
http {
client {
<span class="hljs-comment"># The time after which an idle connection will be automatically closed.</span>
<span class="hljs-comment"># Set to `infinite` to completely disable idle connection timeouts.</span>
<span class="hljs-comment"># some requests potentially take a long time, like generate and prune</span>
<span class="hljs-attr">idle-timeout</span> = <span class="hljs-number">5</span> minutes
}
}
actor {
debug {
<span class="hljs-comment"># enable DEBUG logging of all AutoReceiveMessages (Kill, PoisonPill etc.)</span>
<span class="hljs-attr">autoreceive=</span> off
<span class="hljs-comment"># enable function of LoggingReceive, which is to log any received message at</span>
<span class="hljs-comment"># DEBUG level</span>
<span class="hljs-attr">receive</span> = on
<span class="hljs-comment"># enable DEBUG logging of unhandled messages</span>
<span class="hljs-attr">unhandled</span> = off
<span class="hljs-comment"># enable DEBUG logging of actor lifecycle changes</span>
<span class="hljs-attr">lifecycle</span> = off
<span class="hljs-attr">event-stream=off</span>
}
}
}
</code></pre>
</span></div></article></div><div class="docLastUpdate"><em>Last updated on 3/13/2020 by Ben Carman</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/chain/chain-query-api"><span class="arrow-prev"></span><span>Chain Query API</span></a><a class="docs-next button" href="/docs/core/core-intro"><span>Core Module</span><span class="arrow-next"></span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#internal-configuration">Internal configuration</a></li><li><a href="#database-migrations">Database Migrations</a></li><li><a href="#example-configuration-file">Example Configuration File</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/favicon.ico" alt="bitcoin-s" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/getting-started">Getting Started</a><a href="/docs/en/core/core-intro">Guides</a><a href="/api/org/bitcoins">API Reference</a></div><div><h5>Community</h5><a href="/en/users.html">User Showcase</a><a href="https://join.slack.com/t/suredbits/shared_invite/zt-eavycu0x-WQL7XOakzQo8tAy7jHHZUw" target="_blank" rel="noreferrer noopener">Slack</a><a href="https://gitter.im/bitcoin-s-core/">Gitter chat</a></div><div><h5>More</h5><a href="https://github.com/bitcoin-s/bitcoin-s">GitHub</a><a class="github-button" href="https://github.com/bitcoin-s/bitcoin-s" data-icon="octicon-star" data-count-href="/bitcoin-s/bitcoin-s-core/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2021 Suredbits &amp; the bitcoin-s developers</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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