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52 lines
2 KiB
Markdown
52 lines
2 KiB
Markdown
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---
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id: version-0.2.0-configuration
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title: Application configuration
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original_id: configuration
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---
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Bitcoin-S uses [HOCON](https://github.com/lightbend/config/blob/master/HOCON.md)
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to configure various parts of the application the library offers. HOCON is a
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superset of JSON, that is, all valid JSON is valid HOCON.
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All configuration for Bitcoin-S is under the `bitcoin-s` key.
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If you have a file `application.conf` anywhere on your classpath when using
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bitcoin-s, the values there take precedence over the ones found in our
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`reference.conf`. We also look for the file `bitcoin-s.conf` in the current
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Bitcoin-S data directory.
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The resolved configuration gets parsed by
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[`AppConfig`](../../db-commons/src/main/scala/org/bitcoins/db/AppConfig.scala).
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`AppConfig` is an abstract class that's implemented by corresponding case
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classes in the `wallet`, `chain` and `node` projects. Here's some examples of how to
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construct a wallet configuration:
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```scala
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import org.bitcoins.wallet.config.WalletAppConfig
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import com.typesafe.config.ConfigFactory
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import java.nio.file.Paths
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import scala.util.Properties
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// reads $HOME/.bitcoin-s/
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val defaultConfig = WalletAppConfig.fromDefaultDatadir()
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// reads a custom data directory
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val customDirectory = Paths.get(Properties.userHome, "custom-bitcoin-s-directory")
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val configFromCustomDatadir = WalletAppConfig(customDirectory)
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// reads a custom data directory and overrides the network to be testnet3
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val customOverride = ConfigFactory.parseString("bitcoin-s.network = testnet3")
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val configFromCustomDirAndOverride = WalletAppConfig(customDirectory, customOverride)
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```
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You can pass as many `com.typesafe.config.Config`s as you'd like. If any
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keys appear multiple times the last one encountered takes precedence.
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## Internal configuration
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Database connections are also configured by using HOCON. This is done in
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[`db.conf`](../../db-commons/src/main/resources/db.conf). The options
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exposed here are **not** intended to
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be used by users of Bitcoin-S, and are internal only.
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