| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.accumulo.monitor.util.logging; |
| |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| |
| import java.io.PrintWriter; |
| import java.io.StringWriter; |
| import java.net.URI; |
| import java.net.http.HttpClient; |
| import java.net.http.HttpRequest; |
| import java.net.http.HttpRequest.BodyPublishers; |
| import java.net.http.HttpResponse.BodyHandlers; |
| import java.util.Optional; |
| import java.util.function.Supplier; |
| |
| import org.apache.accumulo.core.Constants; |
| import org.apache.accumulo.core.conf.SiteConfiguration; |
| import org.apache.accumulo.core.util.Pair; |
| import org.apache.accumulo.fate.zookeeper.ZooCache.ZcStat; |
| import org.apache.accumulo.monitor.rest.logs.LogResource; |
| import org.apache.accumulo.monitor.rest.logs.SingleLogEvent; |
| import org.apache.accumulo.server.ServerContext; |
| import org.apache.logging.log4j.core.Appender; |
| import org.apache.logging.log4j.core.Core; |
| import org.apache.logging.log4j.core.Filter; |
| import org.apache.logging.log4j.core.LogEvent; |
| import org.apache.logging.log4j.core.appender.AbstractAppender; |
| import org.apache.logging.log4j.core.config.Property; |
| import org.apache.logging.log4j.core.config.plugins.Plugin; |
| import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory; |
| |
| import com.google.gson.Gson; |
| |
| import edu.umd.cs.findbugs.annotations.SuppressFBWarnings; |
| |
| /** |
| * A custom Log4j2 Appender which follows the registered location of the active Accumulo monitor |
| * service, and forwards log messages to its log4j REST endpoint at |
| * {@link LogResource#append(SingleLogEvent)}. |
| */ |
| @Plugin(name = "AccumuloMonitor", category = Core.CATEGORY_NAME, |
| elementType = Appender.ELEMENT_TYPE, printObject = true) |
| public class AccumuloMonitorAppender extends AbstractAppender { |
| |
| @PluginBuilderFactory |
| public static <B extends Builder<B>> B newBuilder() { |
| return new Builder<B>().asBuilder(); |
| } |
| |
| public static class Builder<B extends Builder<B>> extends AbstractAppender.Builder<B> |
| implements org.apache.logging.log4j.core.util.Builder<AccumuloMonitorAppender> { |
| |
| @Override |
| public AccumuloMonitorAppender build() { |
| return new AccumuloMonitorAppender(getName(), getFilter(), isIgnoreExceptions(), |
| getPropertyArray()); |
| } |
| |
| } |
| |
| private final Gson gson = new Gson(); |
| private final HttpClient httpClient = HttpClient.newHttpClient(); |
| private final Supplier<Optional<URI>> monitorLocator; |
| |
| private ServerContext context; |
| private String path; |
| private Pair<Long,Optional<URI>> lastResult = new Pair<>(0L, Optional.empty()); |
| |
| private AccumuloMonitorAppender(final String name, final Filter filter, |
| final boolean ignoreExceptions, final Property[] properties) { |
| super(name, filter, null, ignoreExceptions, properties); |
| final ZcStat stat = new ZcStat(); |
| monitorLocator = () -> { |
| // lazily set up context/path |
| if (context == null) { |
| context = new ServerContext(SiteConfiguration.auto()); |
| path = context.getZooKeeperRoot() + Constants.ZMONITOR_HTTP_ADDR; |
| } |
| // get the current location from the cache |
| byte[] loc = context.getZooCache().get(path, stat); |
| Pair<Long,Optional<URI>> last = lastResult; |
| if (stat.getMzxid() != last.getFirst()) { |
| // only create new objects if there's a change |
| last = new Pair<>(stat.getMzxid(), Optional.ofNullable(loc) |
| .map(bytes -> URI.create(new String(bytes, UTF_8) + "rest/logs/append"))); |
| lastResult = last; |
| } |
| return last.getSecond(); |
| }; |
| } |
| |
| @Override |
| public void append(final LogEvent event) { |
| monitorLocator.get().ifPresent(uri -> { |
| try { |
| var pojo = new SingleLogEvent(); |
| pojo.timestamp = event.getTimeMillis(); |
| pojo.application = System.getProperty("accumulo.application", "unknown"); |
| pojo.logger = event.getLoggerName(); |
| pojo.level = event.getLevel().name(); |
| pojo.message = event.getMessage().getFormattedMessage(); |
| pojo.stacktrace = throwableToStacktrace(event.getThrown()); |
| |
| String jsonEvent = gson.toJson(pojo); |
| |
| var req = HttpRequest.newBuilder(uri).POST(BodyPublishers.ofString(jsonEvent, UTF_8)) |
| .setHeader("Content-Type", "application/json").build(); |
| httpClient.sendAsync(req, BodyHandlers.discarding()); |
| } catch (final Exception e) { |
| error("Unable to send HTTP in appender [" + getName() + "]", event, e); |
| } |
| }); |
| } |
| |
| @SuppressFBWarnings(value = "INFORMATION_EXPOSURE_THROUGH_AN_ERROR_MESSAGE", |
| justification = "throwable is intended to be printed to output stream, to send to monitor") |
| private static String throwableToStacktrace(Throwable t) { |
| if (t == null) |
| return null; |
| StringWriter writer = new StringWriter(); |
| t.printStackTrace(new PrintWriter(writer)); |
| return writer.toString(); |
| } |
| |
| @Override |
| public String toString() { |
| return "AccumuloMonitorAppender{" + "name=" + getName() + ", state=" + getState() + '}'; |
| } |
| |
| } |