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// Copyright (C) 2014 The Android Open Source Project
//
// 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 com.google.gerrit.server.util;
import static java.nio.charset.StandardCharsets.UTF_8;
import com.google.common.base.Strings;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.common.Die;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.config.SitePaths;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.IOException;
import java.nio.file.Path;
import org.apache.log4j.Appender;
import org.apache.log4j.AsyncAppender;
import org.apache.log4j.DailyRollingFileAppender;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Layout;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.apache.log4j.helpers.OnlyOnceErrorHandler;
import org.apache.log4j.spi.ErrorHandler;
import org.apache.log4j.spi.LoggingEvent;
import org.eclipse.jgit.lib.Config;
@Singleton
public class SystemLog {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
public static final String LOG4J_CONFIGURATION = "log4j.configuration";
private final SitePaths site;
private final int asyncLoggingBufferSize;
private final boolean rotateLogs;
@Inject
public SystemLog(SitePaths site, @GerritServerConfig Config config) {
this.site = site;
this.asyncLoggingBufferSize = config.getInt("core", "asyncLoggingBufferSize", 64);
this.rotateLogs = config.getBoolean("log", "rotate", true);
}
public static boolean shouldConfigure() {
return Strings.isNullOrEmpty(System.getProperty(LOG4J_CONFIGURATION));
}
public static Appender createAppender(Path logdir, String name, Layout layout, boolean rotate) {
final FileAppender dst = rotate ? new DailyRollingFileAppender() : new FileAppender();
dst.setName(name);
dst.setLayout(layout);
dst.setEncoding(UTF_8.name());
dst.setFile(resolve(logdir).resolve(name).toString());
dst.setImmediateFlush(true);
dst.setAppend(true);
dst.setErrorHandler(new DieErrorHandler());
dst.activateOptions();
dst.setErrorHandler(new OnlyOnceErrorHandler());
return dst;
}
public AsyncAppender createAsyncAppender(String name, Layout layout) {
return createAsyncAppender(name, layout, rotateLogs);
}
private AsyncAppender createAsyncAppender(String name, Layout layout, boolean rotate) {
return createAsyncAppender(name, layout, rotate, false);
}
public AsyncAppender createAsyncAppender(
String name, Layout layout, boolean rotate, boolean forPlugin) {
AsyncAppender async = new AsyncAppender();
async.setName(name);
async.setBlocking(true);
async.setBufferSize(asyncLoggingBufferSize);
async.setLocationInfo(false);
if (forPlugin || shouldConfigure()) {
async.addAppender(createAppender(site.logs_dir, name, layout, rotate));
} else {
Appender appender = LogManager.getLogger(name).getAppender(name);
if (appender != null) {
async.addAppender(appender);
} else {
logger.atWarning().log(
"No appender with the name: %s was found. %s logging is disabled", name, name);
}
}
async.activateOptions();
return async;
}
private static Path resolve(Path p) {
try {
return p.toRealPath().normalize();
} catch (IOException e) {
return p.toAbsolutePath().normalize();
}
}
private static final class DieErrorHandler implements ErrorHandler {
@Override
public void error(String message, Exception e, int errorCode, LoggingEvent event) {
error(e != null ? e.getMessage() : message);
}
@Override
public void error(String message, Exception e, int errorCode) {
error(e != null ? e.getMessage() : message);
}
@Override
public void error(String message) {
throw new Die("Cannot open log file: " + message);
}
@Override
public void activateOptions() {}
@Override
public void setAppender(Appender appender) {}
@Override
public void setBackupAppender(Appender appender) {}
@Override
public void setLogger(Logger logger) {}
}
}
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