logging.jul.PatternFormat.kt Maven / Gradle / Ivy

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Hexagon core utilities. Includes serialization and logging helpers.
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package com.hexagonkt.logging.jul

import com.hexagonkt.helpers.Ansi
import com.hexagonkt.helpers.Ansi.BLUE
import com.hexagonkt.helpers.Ansi.BRIGHT_BLACK
import com.hexagonkt.helpers.Ansi.CYAN
import com.hexagonkt.helpers.Ansi.MAGENTA
import com.hexagonkt.helpers.Ansi.RED
import com.hexagonkt.helpers.Ansi.RESET
import com.hexagonkt.helpers.eol
import com.hexagonkt.helpers.fail
import com.hexagonkt.helpers.toText
import java.time.Instant
import java.time.LocalDateTime
import java.time.ZoneId
import java.util.logging.Formatter
import java.util.logging.Level
import java.util.logging.LogRecord

/**
 * A Formatter implements [Formatter] provides support for formatting Logs.
 *
 * @property useColor use a color to log messages.
 */
class PatternFormat(private val useColor: Boolean = true) : Formatter() {

    private companion object {
        const val TIMESTAMP = "%tH:% = mapOf(
        Level.FINER to Ansi.DEFAULT,
        Level.FINE to Ansi.DEFAULT,
        Level.INFO to BLUE,
        Level.WARNING to Ansi.YELLOW,
        Level.SEVERE to RED + Ansi.BOLD
    )

    private val levelNames: Map = mapOf(
        Level.FINER to "TRACE",
        Level.FINE to "DEBUG",
        Level.INFO to "INFO",
        Level.WARNING to "WARN",
        Level.SEVERE to "ERROR"
    )

    override fun format(record: LogRecord): String {
        val instant = Instant.ofEpochMilli(record.millis)
        val dateTime = LocalDateTime.ofInstant(instant, ZoneId.systemDefault())
        val thrown = record.thrown
        val trace = when {
            thrown == null -> ""
            useColor -> "$eol${thrown.toText()}".replace("\n", "\n$RED")
            else -> "$eol${thrown.toText()}"
        }
        val level = record.level
        val levelName = levelNames[level] ?: fail
        val levelColor = levelColors[level] ?: BLUE
        val message = record.message
        val parameters = record.parameters ?: emptyArray()
        val loggerName = record.loggerName
        val threadName = Thread.currentThread().name
        val msg =
            if (parameters.isEmpty()) message
            else String.format(message, *parameters) + trace

        return if (useColor)
            pattern.format(dateTime, levelColor, levelName, threadName, loggerName, msg)
        else
            pattern.format(dateTime, levelName, threadName, loggerName, msg)
    }
}