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Application Configuration

Bitcoin-S uses HOCON to configure various parts of the application the library offers. HOCON is a superset of JSON, that is, all valid JSON is valid HOCON.

All configuration for Bitcoin-S is under the bitcoin-s key.

If you have a file application.conf anywhere on your classpath when using bitcoin-s, the values there take precedence over the ones found in our reference.conf. We also look for the file bitcoin-s.conf in the current Bitcoin-S data directory.

The resolved configuration gets parsed by AppConfig. AppConfig is an abstract class that's implemented by corresponding case classes in the wallet, chain and node projects. Here's some examples of how to construct a wallet configuration:

import org.bitcoins.wallet.config.WalletAppConfig
import com.typesafe.config.ConfigFactory
import java.nio.file.Paths
import scala.util.Properties

// reads $HOME/.bitcoin-s/
val defaultConfig = WalletAppConfig.fromDefaultDatadir()


// reads a custom data directory
val customDirectory = Paths.get(Properties.userHome, "custom-bitcoin-s-directory")
val configFromCustomDatadir = WalletAppConfig(customDirectory)

// reads a custom data directory and overrides the network to be testnet3
val customOverride = ConfigFactory.parseString("bitcoin-s.network = testnet3")
val configFromCustomDirAndOverride = WalletAppConfig(customDirectory, customOverride)

You can pass as many com.typesafe.config.Configs as you'd like. If any keys appear multiple times the last one encountered takes precedence.

Internal configuration

Database connections are also configured by using HOCON. This is done in db.conf. The options exposed here are not intended to be used by users of Bitcoin-S, and are internal only.

Database Migrations

All of our modules that require databases now have database migrations. The tool we use for these migrations is called flyway. To find your projects migraitons, you need to look inside of the [project-name]/src/main/resources/[database-name]/migration/. For example, the chain projects migrations live under the path chain/src/main/resources/chaindb/migration/V1__chain_db_baseline.sql.

Migrations can be executed by calling the DbManagement.migrate() method. Migrations are applied by default on server startup, via the AppConfig.initialize() method.

These migrations are setup so that project's databases and migrations are independent of each other. Therefore if you want to use the bitcoin-s-chain project, but not the bitcoin-s-wallet 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 slick's configuration and calling AppConfig.initialize() to ensure the entire module is initialized correctly.

Example Configuration File

bitcoin-s {
    datadir = ${HOME}/.bitcoin-s
    network = regtest # regtest, testnet3, mainnet

    logging {
        level = WARN # trace, debug, info, warn, error, off

        # You can also tune specific module loggers.
        # They each take the same levels as above.
        # If they are commented out (as they are
        # by default), `logging.level` gets used
        # instead. 
        # The available loggers are: 

        # incoming and outgoing P2P messages
        # p2p = info

        # verification of block headers, merkle trees
        # chain-verification = info

        # generation of addresses, signing of TXs
        # key-handling = info

        # wallet operations not related to key management
        # wallet = info

        # HTTP RPC server
        # http = info

        # Database interactions
        # database = info

        # whether or not to write to the log file
        disable-file = false

        # whether or not to log to stdout 
        disable-console = false
    }

    node {
        mode = neutrino # neutrino, spv

        peers = [] # 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.
    }

    chain {
        neutrino {
            filter-header-batch-size = 2000
            filter-batch-size = 100
        }
    }

    # settings for wallet module
    wallet {
        defaultAccountType = legacy # legacy, segwit, nested-segwit

        bloomFalsePositiveRate = 0.0001 # percentage

        addressGapLimit = 20

        discoveryBatchSize = 100
    }
}


akka {
    loglevel = "OFF"
    stdout-loglevel = "OFF"
    http {
        client {
            # The time after which an idle connection will be automatically closed.
            # Set to `infinite` to completely disable idle connection timeouts.

            # some requests potentially take a long time, like generate and prune
            idle-timeout = 5 minutes
        }
    }


    actor {
        debug {
            # enable DEBUG logging of all AutoReceiveMessages (Kill, PoisonPill etc.)
            autoreceive= off
            # enable function of LoggingReceive, which is to log any received message at
            # DEBUG level
            receive = on
            # enable DEBUG logging of unhandled messages
            unhandled = off

            # enable DEBUG logging of actor lifecycle changes
            lifecycle = off

            event-stream=off
        }
    }
}