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.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());
        addThresholdFilter(appender, syslog.getThreshold());
        appender.start();

        return appender;
    }

    public static RollingFileAppender buildFileAppender(FileConfiguration file,
                                                                       LoggerContext context,
                                                                       Optional logFormat) {
        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());

        final LogFormatter formatter = new LogFormatter(context, file.getTimeZone());
        for (String format : logFormat.asSet()) {
            formatter.setPattern(format);
        }
        formatter.start();

        final RollingFileAppender appender = new RollingFileAppender();
        appender.setAppend(true);
        appender.setContext(context);
        appender.setLayout(formatter);
        appender.setFile(file.getCurrentLogFilename());
        appender.setPrudent(false);
        appender.setRollingPolicy(rollingPolicy);
        appender.setTriggeringPolicy(triggeringPolicy);
        addThresholdFilter(appender, file.getThreshold());

        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);
    }
}