io.cloudshiftdev.logging.slf4j.Slf4jLoggerAdapter.kt Maven / Gradle / Ivy

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Kotlin Logging API

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package io.cloudshiftdev.logging.slf4j

import io.cloudshiftdev.logging.api.LogLevel
import io.cloudshiftdev.logging.spi.LoggerAdapter
import io.cloudshiftdev.logging.spi.LoggingEvent
import org.slf4j.Logger

public class Slf4jLoggerAdapter(private val logger: Logger) : LoggerAdapter {
    override suspend fun isEnabled(level: LogLevel): Boolean =
        logger.isEnabledForLevel(level.toSlf4jLevel())

    override suspend fun log(event: LoggingEvent) {
        val builder = logger.atLevel(event.level.toSlf4jLevel()).setCause(event.thrown)
        event.tags.forEach { (key, value) -> builder.addKeyValue(key, value) }
        builder.log(event.message)
    }
}

private fun LogLevel.toSlf4jLevel(): org.slf4j.event.Level {
    return when (this) {
        LogLevel.Trace -> org.slf4j.event.Level.TRACE
        LogLevel.Debug -> org.slf4j.event.Level.DEBUG
        LogLevel.Info -> org.slf4j.event.Level.INFO
        LogLevel.Warn -> org.slf4j.event.Level.WARN
        LogLevel.Error -> org.slf4j.event.Level.ERROR
    }
}

// TODO - benchmark map lookup vs when, for each log level
// private val logLevelToSlf4jLevel =
//    mapOf(
//            LogLevel.Trace to org.slf4j.event.Level.TRACE,
//            LogLevel.Debug to org.slf4j.event.Level.DEBUG,
//            LogLevel.Info to org.slf4j.event.Level.INFO,
//            LogLevel.Warn to org.slf4j.event.Level.WARN,
//            LogLevel.Error to org.slf4j.event.Level.ERROR,
//        )
//        .let { map -> IdentityHashMap(map) }
//
// private fun LogLevel.toSlf4jLevel2(): org.slf4j.event.Level =
//    logLevelToSlf4jLevel[this] ?: error("Unknown log level: $this")