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
import scala.concurrent.ExecutionContext.Implicits.global
// reads $HOME/.bitcoin-s/
val defaultConfig = WalletAppConfig.fromDefaultDatadir()
// reads a custom data directory
val customDirectory = Paths.get(Properties.userHome, "custom-bitcoin-s-directory")
val configFromCustomDatadir = WalletAppConfig(customDirectory)
// reads a custom data directory and overrides the network to be testnet3
val customOverride = ConfigFactory.parseString("bitcoin-s.network = testnet3")
val configFromCustomDirAndOverride = WalletAppConfig(customDirectory, customOverride)
You can pass as many com.typesafe.config.Configs as you'd like. If any
keys appear multiple times the last one encountered takes precedence.
Command Line Options
There are a few command line options available that take precedence over configuration file.
--datadir <directory>datadirsets the data directory instead of using the default$HOME/.bitcoin-s--rpcbind <ip>rpcbindsets the interface the rpc server binds to instead of using the default127.0.0.1--rpcport <port>rpcportsets the port the rpc server binds to instead of using the default9999--force-recalc-chainworkforce-recalc-chainworkwill force a recalculation of the entire chain's chain work, this can be useful if there is an incompatible migration or if it got out of sync.-Dlogback.configurationFile=/path/to/config.xmlYou can set a custom logback configuration. If you need help creating a custom logback file you can read the logback configuration documentation.
Internal configuration
Database connections are also configured by using HOCON.
This is done in reference.conf inside the db-commons module.
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.start()
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.start()
to ensure the entire module is initialized correctly.
Example Configuration File
bitcoin-s {
datadir = ${HOME}/.bitcoin-s
network = regtest # regtest, testnet3, mainnet, signet
dbDefault = {
dataSourceClass = slick.jdbc.DatabaseUrlDataSource
profile = "slick.jdbc.SQLiteProfile$"
db {
# for information on parameters available here see
# https://scala-slick.org/doc/3.3.1/api/index.html#slick.jdbc.JdbcBackend$DatabaseFactoryDef@forConfig(String,Config,Driver,ClassLoader):Database
path = ${bitcoin-s.datadir}/${bitcoin-s.network}/
driver = org.sqlite.JDBC
user = ""
password = ""
host = localhost
port = 5432
# this needs to be set to 1 for SQLITE as it does not support concurrent database operations
# see: https://github.com/bitcoin-s/bitcoin-s/pull/1840
numThreads = 1
queueSize=5000
connectionPool = "HikariCP"
registerMbeans = true
}
hikari-logging = false
hikari-logging-interval = 1 minute
}
bitcoind-rpc {
# bitcoind rpc username
rpcuser = user
# bitcoind rpc password
rpcpassword = password
# Binary location of bitcoind
binary = ${HOME}/.bitcoin-s/binaries/bitcoind/bitcoin-0.20.1/bin/bitcoind
# bitcoind datadir
datadir = ${HOME}/.bitcoin
# bitcoind network binding
bind = localhost
# bitcoind p2p port
port = 8333
# bitcoind rpc binding
rpcbind = localhost
# bitcoind rpc port
rpcport = 8332
# bitcoind zmq port for all services
zmqport = 29000
}
node {
mode = neutrino # neutrino, spv, bitcoind
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.
hikari-logging = true
hikari-logging-interval = 1 minute
}
chain {
force-recalc-chainwork = false
neutrino {
filter-header-batch-size.default = 2000
filter-header-batch-size.regtest = 10
# You can set a network specific filter-header-batch-size
# by adding a trailing `.networkId` (main, test, regtest)
# It is recommended to keep the main and test batch size high
# to keep the sync time fast, however, for regtest it should be small
# so it does not exceed the chain size.
filter-batch-size = 1000
}
hikari-logging = true
hikari-logging-interval = 1 minute
}
# settings for wallet module
wallet {
# You can have multiple wallets by setting a different
# wallet name for each of them. They will each have
# their own unique seed and database or schema,
# depending on the database driver.
# The wallet name can contain letters, numbers, and underscores '_'.
# walletName = MyWallet0
defaultAccountType = segwit # legacy, segwit, nested-segwit
bloomFalsePositiveRate = 0.0001 # percentage
addressGapLimit = 20
discoveryBatchSize = 100
requiredConfirmations = 6
# How big the address queue size is before we throw an exception
# because of an overflow
addressQueueSize = 10
# How long we attempt to generate an address for
# before we timeout
addressQueueTimeout = 5 seconds
hikari-logging = true
hikari-logging-interval = 1 minute
}
keymanager {
# You can optionally set a BIP 39 password
# bip39password = "changeMe"
# Password that your seed is encrypted with
aesPassword = changeMe
}
# Bitcoin-S provides manny different fee providers
# You can configure your server to use any of them
# Below is some examples of different options
fee-provider {
# name = mempoolspace # Uses mempool.space's api
# The target is optional for mempool.space
# It refers to the expected number of blocks until confirmation
# target = 6
# name = bitcoinerlive # Uses bitcoiner.live's api
# The target is optional for Bitcoiner Live
# It refers to the expected number of blocks until confirmation
# target = 6
# name = bitgo # Uses BitGo's api
# The target is optional for BitGo
# It refers to the expected number of blocks until confirmation
# target = 6
# name = constant # A constant fee rate in sats/vbyte
# target = 1 # Will always use 1 sat/vbyte
}
server {
# The port we bind our rpc server on
rpcport = 9999
# The ip address we bind our server too
rpcbind = "127.0.0.1"
}
oracle {
hikari-logging = true
hikari-logging-interval = 1 minute
}
}
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
}
server {
# The amount of time until a request times out on the server
# If you have a large payload this may need to be bumped
# https://doc.akka.io/docs/akka-http/current/common/timeouts.html#request-timeout
request-timeout = 10s
}
}
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
}
}
}
Database configuration
By default, bitcoin-s uses Sqlite to store its data.
It creates three Sqlite databases in ~/.bitcoin-s/${network}: chain.sqlite for chain project,
node.sqlite for node project and wallet.sqlite the wallet. This is the default configuration,
it doesn't require additional changes in the config file.
bitcoin-s also supports PostgreSQL as a database backend. In order to use a
PostgreSQL database for all project you need to add following into your config file:
bitcoin-s {
common {
profile = "slick.jdbc.PostgresProfile$"
db {
driver = org.postgresql.Driver
# these 3 options will result into a jdbc url of
# "jdbc:postgresql://localhost:5432/database"
name = database
host = localhost
port = 5432
user = "user"
password = "topsecret"
numThreads = 5
# http://scala-slick.org/doc/3.3.3/database.html
connectionPool = "HikariCP"
registerMbeans = true
}
}
chain.profile = ${bitcoin-s.common.profile}
chain.db = ${bitcoin-s.common.db}
chain.db.poolName = "chain-connection-pool"
node.profile = ${bitcoin-s.common.profile}
node.db = ${bitcoin-s.common.db}
node.db.poolName = "node-connection-pool"
wallet.profile = ${bitcoin-s.common.profile}
wallet.db = ${bitcoin-s.common.db}
wallet.db.poolName = "wallet-connection-pool"
oracle.profile = ${bitcoin-s.common.profile}
oracle.db = ${bitcoin-s.common.db}
oracle.db.poolName = "oracle-connection-pool"
}
The database driver will create a separate SQL namespace for each sub-project: chain, node and wallet.
Also you can use mix databases and drivers in one configuration. For example,
This configuration file enables Sqlite for node project (it's default, so its configuration
is omitted), and walletdb and chaindb PostgreSQL databases for wallet and chain projects:
bitcoin-s {
chain {
profile = "slick.jdbc.PostgresProfile$"
db {
driver = org.postgresql.Driver
name = chaindb
host = localhost
port = 5432
user = "user"
password = "topsecret"
}
}
wallet {
profile = "slick.jdbc.PostgresProfile$"
db {
driver = org.postgresql.Driver
name = walletdb
host = localhost
port = 5432
user = "user"
password = "topsecret"
}
}
}