com.yammer.dropwizard.logging.LogbackFactory Maven / Gradle / Ivy

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package com.yammer.dropwizard.logging;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.filter.ThresholdFilter;
import ch.qos.logback.classic.net.SyslogAppender;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.ConsoleAppender;
import ch.qos.logback.core.FileAppender;
import ch.qos.logback.core.rolling.DefaultTimeBasedFileNamingAndTriggeringPolicy;
import ch.qos.logback.core.rolling.RollingFileAppender;
import ch.qos.logback.core.rolling.TimeBasedRollingPolicy;
import ch.qos.logback.core.spi.FilterAttachable;
import com.google.common.base.Optional;

import static com.yammer.dropwizard.config.LoggingConfiguration.*;

public class LogbackFactory {
    private LogbackFactory() { /* singleton */ }

    public static SyslogAppender buildSyslogAppender(SyslogConfiguration syslog,
                                                     LoggerContext context,
                                                     String name,
                                                     Optional logFormat) {
        final SyslogFormatter layout = new SyslogFormatter(context, syslog.getTimeZone(), name);
        layout.setOutputPatternAsHeader(false);
        layout.setContext(context);
        for (String format : logFormat.asSet()) {
            layout.setPattern(format);
        }
        layout.start();

        final SyslogAppender appender = new SyslogAppender();
        appender.setContext(context);
        appender.setLayout(layout);
        appender.setSyslogHost(syslog.getHost());
        appender.setFacility(syslog.getFacility().toString());
        addThresholdFilter(appender, syslog.getThreshold());
        appender.start();

        return appender;
    }

    public static FileAppender buildFileAppender(FileConfiguration file,
                                                                       LoggerContext context,
                                                                       Optional logFormat) {
        final LogFormatter formatter = new LogFormatter(context, file.getTimeZone());
        for (String format : logFormat.asSet()) {
            formatter.setPattern(format);
        }
        formatter.start();

        final FileAppender appender = 
            file.isArchive() ? new RollingFileAppender() :
                               new FileAppender();

        appender.setAppend(true);
        appender.setContext(context);
        appender.setLayout(formatter);
        appender.setFile(file.getCurrentLogFilename());
        appender.setPrudent(false);

        addThresholdFilter(appender, file.getThreshold());

        if (file.isArchive()) {

            final DefaultTimeBasedFileNamingAndTriggeringPolicy triggeringPolicy =
                    new DefaultTimeBasedFileNamingAndTriggeringPolicy();
            triggeringPolicy.setContext(context);

            final TimeBasedRollingPolicy rollingPolicy = new TimeBasedRollingPolicy();
            rollingPolicy.setContext(context);
            rollingPolicy.setFileNamePattern(file.getArchivedLogFilenamePattern());
            rollingPolicy.setTimeBasedFileNamingAndTriggeringPolicy(
                    triggeringPolicy);
            triggeringPolicy.setTimeBasedRollingPolicy(rollingPolicy);
            rollingPolicy.setMaxHistory(file.getArchivedFileCount());

            ((RollingFileAppender) appender).setRollingPolicy(rollingPolicy);
            ((RollingFileAppender) appender).setTriggeringPolicy(triggeringPolicy);

            rollingPolicy.setParent(appender);
            rollingPolicy.start();
        }

        appender.stop();
        appender.start();

        return appender;
    }

    public static ConsoleAppender buildConsoleAppender(ConsoleConfiguration console,
                                                                      LoggerContext context,
                                                                      Optional logFormat) {
        final LogFormatter formatter = new LogFormatter(context, console.getTimeZone());
        for (String format : logFormat.asSet()) {
            formatter.setPattern(format);
        }
        formatter.start();

        final ConsoleAppender appender = new ConsoleAppender();
        appender.setContext(context);
        appender.setLayout(formatter);
        addThresholdFilter(appender, console.getThreshold());
        appender.start();

        return appender;
    }

    private static void addThresholdFilter(FilterAttachable appender, Level threshold) {
        final ThresholdFilter filter = new ThresholdFilter();
        filter.setLevel(threshold.toString());
        filter.start();
        appender.addFilter(filter);
    }
}