net.grinder.AgentUpdateHandler.java Source code

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Here is the source code for net.grinder.AgentUpdateHandler.java

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/* 
 * 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 net.grinder;

import net.grinder.communication.CommunicationException;
import net.grinder.engine.communication.AgentUpdateGrinderMessage;
import net.grinder.util.VersionNumber;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.ngrinder.common.constants.AgentConstants;
import org.ngrinder.common.util.CompressionUtils;
import org.ngrinder.infra.AgentConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;

import static org.ngrinder.common.constants.InternalConstants.PROP_INTERNAL_NGRINDER_VERSION;
import static org.ngrinder.common.util.Preconditions.checkTrue;

/**
 * Agent Update Message Handler.
 *
 * @author JunHo Yoon
 * @since 3.1
 */
@SuppressWarnings("ResultOfMethodCallIgnored")
public class AgentUpdateHandler implements Closeable {
    private static final Logger LOGGER = LoggerFactory.getLogger(AgentUpdateHandler.class);

    private final AgentConfig agentConfig;
    private File download;
    @SuppressWarnings("FieldCanBeLocal")
    private int offset = 0;
    private FileOutputStream agentOutputStream;

    /**
     * Agent Update handler.
     *
     * @param agentConfig agentConfig
     * @param message     AgentUpdateGrinderMessage
     */
    public AgentUpdateHandler(AgentConfig agentConfig, AgentUpdateGrinderMessage message)
            throws FileNotFoundException {
        if (!agentConfig.getAgentProperties().getPropertyBoolean(AgentConstants.PROP_AGENT_UPDATE_ALWAYS)) {
            checkTrue(
                    isNewer(message.getVersion(),
                            agentConfig.getInternalProperties().getProperty(PROP_INTERNAL_NGRINDER_VERSION)),
                    "Update request was sent. But it's the older version " + message.getVersion());
        }
        this.agentConfig = agentConfig;
        this.download = new File(agentConfig.getHome().getTempDirectory(), "ngrinder-agent.tar");
        this.agentOutputStream = new FileOutputStream(download);
        LOGGER.info("AgentUpdateHandler is initialized!");
    }

    boolean isNewer(String newVersion, String installedVersion) {
        if (newVersion.contains("-SNAPSHOT")) {
            return true;
        }
        installedVersion = installedVersion.replaceAll("\\(.*\\)", "").trim();
        newVersion = newVersion.replaceAll("\\(.*\\)", "").trim();
        return new VersionNumber(newVersion).compareTo(new VersionNumber(installedVersion)) > 0;
    }

    public void close() {
        IOUtils.closeQuietly(agentOutputStream);
        FileUtils.deleteQuietly(download);
    }

    /**
     * Update agent based on the current message.
     *
     * @param message message to be sent
     */
    public void update(AgentUpdateGrinderMessage message) throws CommunicationException {
        if (message.getOffset() != offset) {
            throw new CommunicationException("Expected " + offset + " offset," + " but " + message.getOffset()
                    + " was sent. " + ToStringBuilder.reflectionToString(message));
        }
        try {
            IOUtils.write(message.getBinary(), agentOutputStream);
            offset = message.getNext();
        } catch (IOException e) {
            throw new CommunicationException("Error while writing binary", e);
        }
        if (message.getNext() == 0) {
            IOUtils.closeQuietly(agentOutputStream);
            decompressDownloadPackage();
            // Then just exist to run the agent update process.
            System.exit(0);
        }
    }

    void decompressDownloadPackage() {
        File interDir = new File(agentConfig.getHome().getTempDirectory(), "update_package_unpacked");
        File toDir = new File(agentConfig.getCurrentDirectory(), "update_package");
        interDir.mkdirs();
        toDir.mkdirs();

        if (FilenameUtils.isExtension(download.getName(), "tar")) {
            File outFile = new File(toDir, "ngrinder-agent.tar");
            CompressionUtils.untar(download, interDir);
            FileUtils.deleteQuietly(outFile);
        } else {
            LOGGER.error("{} is not allowed to be unpacked.", download.getName());
        }

        try {
            FileUtils.deleteQuietly(toDir);
            FileUtils.moveDirectory(new File(interDir, "ngrinder-agent"), toDir);
        } catch (IOException e) {
            LOGGER.error("Error while moving a file ", e);
        }
        FileUtils.deleteQuietly(download);
        FileUtils.deleteQuietly(interDir);
    }
}