ZIO learning - using zio logging great features with logback / published by https://github.com/dacr/code-examples-manager #54e632d9-0e23-4e1c-aec8-b9a0e2e4fee7/2ad197ad21554dc115a0d396d66bff1e193818ad

zio-learning-logging-3-features-with-logback.sc

// summary : ZIO learning - using zio logging great features with logback
// keywords : scala, zio, learning, logging, pure-functional, logback, mdc, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : 54e632d9-0e23-4e1c-aec8-b9a0e2e4fee7
// created-on : 2023-05-07T18:04:29+02:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala  "3.2.2"
//> using dep "dev.zio::zio:2.0.13"
//> using dep "dev.zio::zio-logging:2.1.13"
//> using dep "dev.zio::zio-logging-slf4j2:2.1.13"
//> using dep "ch.qos.logback:logback-classic:1.4.7"
// ---------------------

import zio.*
import zio.logging.*
import ZIOAspect.*
import zio.logging.{LogFormat, removeDefaultLoggers}
import zio.logging.backend.SLF4J

// =====================================================================================================================

object LogBackHelpers {
  import org.slf4j.LoggerFactory
  import ch.qos.logback.classic

  def configureLogBack(xmlConfig: String): Unit = {
    val loggerContext = LoggerFactory.getILoggerFactory.asInstanceOf[classic.LoggerContext]
    loggerContext.reset()
    val configurator = new classic.joran.JoranConfigurator()
    val configStream = new java.io.ByteArrayInputStream(xmlConfig.getBytes)
    configurator.setContext(loggerContext)
    configurator.doConfigure(configStream)
  }
}

val logConfig =
  """<?xml version="1.0" encoding="UTF-8"?>
    |
    |<configuration
    |        scan="false"
    |        scanPeriod="10 seconds"
    |        xmlns="http://ch.qos.logback/xml/ns/logback"
    |        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    |        xsi:schemaLocation="http://ch.qos.logback/xml/ns/logback https://raw.githubusercontent.com/enricopulatzo/logback-XSD/master/src/main/xsd/logback.xsd">
    |
    |    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    |        <encoder>
    |            <pattern>%highlight(%date %level %logger{10} [%file:%line] %msg - %kvp%n)</pattern>
    |        </encoder>
    |    </appender>
    |
    |    <root level="info">
    |        <appender-ref ref="STDOUT"/>
    |    </root>
    |</configuration>
    |""".stripMargin

import LogBackHelpers._
configureLogBack(logConfig)

// =====================================================================================================================

object Encapsulated extends ZIOAppDefault {

  override val bootstrap = removeDefaultLoggers ++ SLF4J.slf4j

  val doThat =
    ZIO.logSpan("doThat") {
      ZIO.succeed(true) @@ logged("result")
    }

  val getIt =
    ZIO.logSpan("processThat") {
      for {
        x <- ZIO.succeed(42)
        _ <- doThat
        _ <- ZIO.logInfo(s"$x has been received")
      } yield x
    }

  val myapp =
    ZIO.logSpan("myapp") {
      for {
        _      <- ZIO.logInfo("Application has started")
        _      <- ZIO.logWarning("Configuration is wrong")
        userId <- Random.nextUUID
        result <- getIt @@ annotated("userId" -> userId.toString) @@ logged("getIt result") // The result is appended :) Great !!!
        _      <- ZIO.logInfo("Application has finished")
      } yield ()
    }

  def run = myapp
}

Encapsulated.main(Array.empty)