slime is a structured logging library for Scala. It is based on logback and provides a custom type-based logger interface plus encoders.
Configuration is made through the same mechanisms made available by logback. For instance, you can use logback.xml to enable slime:
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="console" class="ch.qos.logback.core.ConsoleAppender">
<encoder class="com.unstablebuild.slime.Encoder" />
<format class="com.unstablebuild.slime.format.Json" />
</encoder>
</appender>
<root level="all">
<appender-ref ref="console" />
</root>
</configuration>... then, given a piece of code like the one below:
case class User(username: String, emails: Set[String])
class Service extends LazyLogging {
def register(user: User): Unit = {
val id = //..
logger.info("A new user was registered", "id" -> id, "user" -> user)
id
}
}... would generate the following output:
{"level":"INFO","message":"A new user was registered","id":123,"user":{"username":"slimedoe","emails":["[email protected]"]}}