org.apache.accumulo.monitor.rest.logs.LogResource.java Source code

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Here is the source code for org.apache.accumulo.monitor.rest.logs.LogResource.java

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/*
 * 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.rest.logs;

import java.util.ArrayList;
import java.util.List;

import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

import org.apache.accumulo.server.monitor.DedupedLogEvent;
import org.apache.accumulo.server.monitor.LogService;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.spi.LoggingEvent;

/**
 * Responsible for generating a new log JSON object
 *
 * @since 2.0.0
 */
@Path("/logs")
@Produces({ MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML })
public class LogResource {

    /**
     * Generates log event list as a JSON object
     *
     * @return log event array
     */
    @GET
    public List<LogEvent> getRecentLogs() {
        List<DedupedLogEvent> dedupedLogEvents = LogService.getInstance().getEvents();
        ArrayList<LogEvent> logEvents = new ArrayList<>(dedupedLogEvents.size());

        for (DedupedLogEvent dev : dedupedLogEvents) {
            LoggingEvent ev = dev.getEvent();
            Object application = ev.getMDC("application");
            if (application == null)
                application = "";
            String msg = ev.getMessage().toString();
            // truncate if full hadoop errors get logged as a message
            msg = StringUtils.abbreviate(sanitize(msg), 300);

            String[] stacktrace = ev.getThrowableStrRep();
            if (stacktrace != null)
                for (int i = 0; i < stacktrace.length; i++)
                    stacktrace[i] = sanitize(stacktrace[i]);

            // Add a new log event to the list
            logEvents.add(new LogEvent(ev.getTimeStamp(), application, dev.getCount(), ev.getLevel().toString(),
                    msg.trim(), stacktrace));
        }
        return logEvents;
    }

    private String sanitize(String s) {
        StringBuilder text = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            int type = Character.getType(c);
            boolean notPrintable = type == Character.UNASSIGNED || type == Character.LINE_SEPARATOR
                    || type == Character.NON_SPACING_MARK || type == Character.PRIVATE_USE;
            text.append(notPrintable ? '?' : c);
        }
        return text.toString().replaceAll("&", "&amp;").replaceAll("<", "&lt;").replaceAll(">", "&gt;");
    }

    /**
     * REST call to clear the logs
     */
    @POST
    public void clearLogs() {
        LogService.getInstance().clear();
    }
}