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zio-logging-jpl
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/*
 * Copyright 2019-2024 John A. De Goes and the ZIO Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package zio.logging.backend

import zio.logging.internal.LogAppender
import zio.logging.{ LogFormat, LoggerNameExtractor }
import zio.{ Cause, FiberFailure, FiberId, FiberRefs, LogLevel, LogSpan, Runtime, Trace, ZLayer, ZLogger, logging }

object JPL {

  private[backend] val logLevelMapping: Map[LogLevel, System.Logger.Level] = Map(
    LogLevel.All     -> System.Logger.Level.ALL,
    LogLevel.Trace   -> System.Logger.Level.TRACE,
    LogLevel.Debug   -> System.Logger.Level.DEBUG,
    LogLevel.Info    -> System.Logger.Level.INFO,
    LogLevel.Warning -> System.Logger.Level.WARNING,
    LogLevel.Error   -> System.Logger.Level.ERROR,
    LogLevel.Fatal   -> System.Logger.Level.ERROR,
    LogLevel.None    -> System.Logger.Level.OFF
  )

  /**
   * default log format for JPL logger
   */
  val logFormatDefault: LogFormat =
    LogFormat.allAnnotations(excludeKeys = Set(logging.loggerNameAnnotationKey)) + LogFormat.line + LogFormat.cause

  private[backend] def getLoggerName(default: String = "zio-jpl-logger"): Trace => String =
    trace => LoggerNameExtractor.trace(trace, FiberRefs.empty, Map.empty).getOrElse(default)

  private def logAppender(systemLogger: System.Logger, logLevel: LogLevel): LogAppender = new LogAppender {
    self =>
    val message: StringBuilder = new StringBuilder()
    var throwable: Throwable   = null

    /**
     * cause as throwable
     */
    override def appendCause(cause: Cause[Any]): Unit = {
      if (!cause.isEmpty) {
        val maybeThrowable = (cause.failures.collect { case t: Throwable => t } ++ cause.defects).headOption
        maybeThrowable match {
          case Some(t) => throwable = t
          case None    => throwable = FiberFailure(cause)
        }
      }
      ()
    }

    override def appendNumeric[A](numeric: A): Unit = appendText(numeric.toString)

    override def appendText(text: String): Unit = {
      message.append(text)
      ()
    }

    override def closeKeyOpenValue(): Unit =
      appendText("=")

    override def closeLogEntry(): Unit = {
      logLevelMapping.get(logLevel).foreach { level =>
        systemLogger.log(level, message.toString, throwable)
      }
      ()
    }

    override def closeValue(): Unit = appendText(" ")

    override def openKey(): Unit = ()

    override def openLogEntry(): Unit = {
      message.clear()

      throwable = null
      ()
    }
  }

  private def isLogLevelEnabled(systemLogger: System.Logger, logLevel: LogLevel): Boolean =
    logLevelMapping.get(logLevel).exists(systemLogger.isLoggable)

  def jpl(
    format: LogFormat,
    loggerName: Trace => String
  ): ZLayer[Any, Nothing, Unit] =
    Runtime.addLogger(jplLogger(format, loggerName))

  def jpl(
    format: LogFormat
  ): ZLayer[Any, Nothing, Unit] =
    jpl(format, getLoggerName())

  val jpl: ZLayer[Any, Nothing, Unit] =
    jpl(logFormatDefault)

  def jplLogger(
    format: LogFormat,
    loggerName: Trace => String = getLoggerName()
  ): ZLogger[String, Unit] =
    jplLogger(format, loggerName, System.getLogger)

  private[backend] def jplLogger(
    format: LogFormat,
    loggerName: Trace => String,
    getJPLogger: String => System.Logger
  ): ZLogger[String, Unit] =
    JplLogger(format, loggerName, getJPLogger)

  private[logging] case class JplLogger(
    format: LogFormat,
    loggerName: Trace => String,
    getJPLogger: String => System.Logger
  ) extends ZLogger[String, Unit] {

    override def apply(
      trace: Trace,
      fiberId: FiberId,
      logLevel: LogLevel,
      message: () => String,
      cause: Cause[Any],
      context: FiberRefs,
      spans: List[LogSpan],
      annotations: Map[String, String]
    ): Unit = {
      val jpLoggerName = annotations.getOrElse(zio.logging.loggerNameAnnotationKey, loggerName(trace))
      val jpLogger     = getJPLogger(jpLoggerName)
      if (isLogLevelEnabled(jpLogger, logLevel)) {
        val appender = logAppender(jpLogger, logLevel)

        format.unsafeFormat(appender)(trace, fiberId, logLevel, message, cause, context, spans, annotations)
        appender.closeLogEntry()
      }
      ()
    }
  }

}