Convenient logback json support using Kotlin extensions

LoggingSupport.kt

// NOTE: inspired by https://www.innoq.com/en/blog/structured-logging/#structuredarguments

import net.logstash.logback.argument.StructuredArguments.kv
import org.slf4j.Logger

const val DEFAULT_KEY = "ctx"

internal fun o(ctx: Any? = null) = kv(
    DEFAULT_KEY,
    object {
        val `class` = if (ctx == null) "(null)" else ctx::class.java.canonicalName
        val `object` = ctx
    }
)

fun Logger.traceJson(format: String, ctx: Any? = null) {
    this.trace(format, o(ctx))
}

fun Logger.debugJson(format: String, ctx: Any? = null) {
    this.debug(format, o(ctx))
}

fun Logger.infoJson(format: String, ctx: Any? = null) {
    this.info(format, o(ctx))
}

fun Logger.warnJson(format: String, ctx: Any? = null) {
    this.warn(format, o(ctx))
}

fun Logger.errorJson(format: String, ctx: Any? = null) {
    this.error(format, o(ctx))
}