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For example:
val port = ConfigDef.getOrUse[Port]("server.port", port"8085")
def configSources[F[_]: Applicative]: ConfigSources[F] = {
// Allow property names like `foo.bar` to map to environment variables like `FOO_BAR`
// Taken from https://github.com/japgolly/clear-config/issues/132
def propertyToEnv(k: ConfigKey): List[ConfigKey] =
k :: k.map(_.toUpperCase.replace('.', '_')) :: Nil
ConfigSource.environment[F].mapKeyQueries(propertyToEnv) >
ConfigSource.propFile[F]("deploy.properties", optional = true)
ConfigSource.system[F]
}
def readConfig[F[_]: MonadThrow](log: Logger[F]): F[MainConfig] =
config.withReport
.run(configSources[F])
.flatMap(_.toEither.leftMap(e => new Exception(e) with NoStackTrace {}).liftTo[F])
.flatMap { case (cfg, report) =>
// Don't bother reporting unused environment variables, or "system" settings
val reportMessage = report
.mapUnused(_.withoutSources(ConfigSourceName.environment, ConfigSourceName.system))
.full
log
.info(reportMessage)
.as(cfg)
}Results in a config report like this:
Used keys (5):
+-----------------+------+-----------------------------------------------------------------+---------+
| Key | Env | /Users/gavin/blahblah/blahblahblahblahblah/local-dev.properties | Default |
+-----------------+------+-----------------------------------------------------------------+---------+
| SERVER_PORT | 8089 | | |
| server.port | | | 8085 |
+-----------------+------+-----------------------------------------------------------------+---------+
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