kalumet-modules/agent/src/main/java/org/apache/kalumet/agent/updater/SharedLibraryUpdater.java

/*
 * 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.kalumet.agent.updater;

import org.apache.kalumet.KalumetException;
import org.apache.kalumet.agent.Configuration;
import org.apache.kalumet.agent.utils.EventUtils;
import org.apache.kalumet.controller.core.ControllerException;
import org.apache.kalumet.controller.core.JEEApplicationServerController;
import org.apache.kalumet.controller.core.JEEApplicationServerControllerFactory;
import org.apache.kalumet.model.Environment;
import org.apache.kalumet.model.JEEApplicationServer;
import org.apache.kalumet.model.Kalumet;
import org.apache.kalumet.model.SharedLibrary;
import org.apache.kalumet.model.update.UpdateLog;
import org.apache.kalumet.model.update.UpdateMessage;
import org.apache.kalumet.utils.NotifierUtils;
import org.apache.kalumet.utils.PublisherUtils;
import org.apache.kalumet.utils.VariableUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Shared library updater.
 */
public class SharedLibraryUpdater
{

    private static final transient Logger LOGGER = LoggerFactory.getLogger( SharedLibraryUpdater.class );

    /**
     * Updates a shared library.
     *
     * @param environment   the target <code>Environment</code>.
     * @param server        the target <code>JEEApplicationServer</code>.
     * @param sharedLibrary the target <code>SharedLibrary</code>.
     * @param updateLog     the <code>UpdateLog</code> to use.
     * @throws UpdateException in case of update failure.
     */
    public static void update( Environment environment, JEEApplicationServer server, SharedLibrary sharedLibrary,
                               UpdateLog updateLog )
        throws UpdateException
    {
        LOGGER.info( "Updating shared library {}", sharedLibrary.getName() );

        updateLog.addUpdateMessage( new UpdateMessage( "info", "Updating shared library " + sharedLibrary.getName() ) );
        EventUtils.post( environment, "UPDATE", "Updating shared library " + sharedLibrary.getName() );
        if ( !sharedLibrary.isActive() )
        {
            // the shared library is not active
            LOGGER.info( "Shared library {} is inactive, so not updated", sharedLibrary.getName() );
            updateLog.addUpdateMessage( new UpdateMessage( "info", "Shared library " + sharedLibrary.getName()
                + " is inactive, so not updated" ) );
            EventUtils.post( environment, "UPDATE",
                             "Shared library " + sharedLibrary.getName() + " is inactive, so not updated" );
            return;
        }
        JEEApplicationServerController controller = null;
        try
        {
            // connect JMX controller to JEE application server
            LOGGER.debug( "Connecting to JEE application server {} controller", server.getName() );
            controller = JEEApplicationServerControllerFactory.getController( environment, server );
        }
        catch ( KalumetException e )
        {
            LOGGER.error( "Can't connect to JEE application server {} controller", server.getName(), e );
            throw new UpdateException( "Can't connect to JEE application server " + server.getName() + " controller",
                                       e );
        }
        // replaces variables in shared library class path.
        LOGGER.debug( "Replacing variables into the shared library classpath" );
        String mapClasspath = VariableUtils.replace( sharedLibrary.getClasspath(), environment.getVariables() );
        try
        {
            if ( controller.isSharedLibraryDeployed( sharedLibrary.getName() ) )
            {
                // the shared library is already deployed, check for update
                LOGGER.info( "Shared library {} already deployed, checking for update", sharedLibrary.getName() );
                if ( controller.updateSharedLibrary( sharedLibrary.getName(), mapClasspath ) )
                {
                    // the shared library has been updated
                    updateLog.setStatus( "Update performed" );
                    updateLog.setUpdated( true );
                    updateLog.addUpdateMessage(
                        new UpdateMessage( "info", "Shared library " + sharedLibrary.getName() + " updated" ) );
                    EventUtils.post( environment, "UPDATE", "Shared library " + sharedLibrary.getName() + " updated" );
                    LOGGER.info( "Shared library " + sharedLibrary.getName() + " udpated" );
                }
            }
            else
            {
                // the shared library is not deployed, deploy it
                controller.deploySharedLibrary( sharedLibrary.getName(), mapClasspath );
                updateLog.setStatus( "Update performed" );
                updateLog.setUpdated( true );
                updateLog.addUpdateMessage(
                    new UpdateMessage( "info", "Shared library " + sharedLibrary.getName() + " deployed" ) );
                EventUtils.post( environment, "UPDATE", "Shared library " + sharedLibrary.getName() + " deployed" );
                LOGGER.info( "Shared library " + sharedLibrary.getName() + " deployed" );
            }
        }
        catch ( ControllerException exception )
        {
            LOGGER.error( "Shared library {} update failed", sharedLibrary.getName(), exception );
            throw new UpdateException( "Shared library " + sharedLibrary.getName() + " update failed", exception );
        }
    }

    /**
     * Wrapper method to update shared library via WS.
     *
     * @param environmentName       the target environment name.
     * @param applicationServerName the target JEE application server name.
     * @param sharedLibraryName     the target shared library name.
     * @throws KalumetException in case of update failure.
     */
    public static void update( String environmentName, String applicationServerName, String sharedLibraryName )
        throws KalumetException
    {
        LOGGER.info( "Shared library {} update requested by WS", sharedLibraryName );

        // load configuration.
        LOGGER.debug( "Loading configuration" );
        Kalumet kalumet = Kalumet.digeste( Configuration.CONFIG_LOCATION );

        // looking for component objects.
        LOGGER.debug( "Looking for component objects" );
        Environment environment = kalumet.getEnvironment( environmentName );
        if ( environment == null )
        {
            LOGGER.error( "Environment {} is not found in the configuration", environmentName );
            throw new KalumetException( "Environment " + environmentName + " is not found in the configuration" );
        }
        JEEApplicationServer applicationServer =
            environment.getJEEApplicationServers().getJEEApplicationServer( applicationServerName );
        if ( applicationServer == null )
        {
            LOGGER.error( "JEE application server {} is not found in environment {}", applicationServerName,
                          environment.getName() );
            throw new KalumetException(
                "JEE application server " + applicationServerName + " is not found in environment "
                    + environment.getName() );
        }
        SharedLibrary sharedLibrary = applicationServer.getSharedLibrary( sharedLibraryName );
        if ( sharedLibrary == null )
        {
            LOGGER.error( "Shared library {} is not found in JEE application server {}", sharedLibraryName,
                          applicationServer.getName() );
            throw new KalumetException(
                "Shared library " + sharedLibraryName + " is not found in JEE application server "
                    + applicationServer.getName() );
        }

        // post an event and create update log
        LOGGER.debug( "Posting an event and creating update log" );
        EventUtils.post( environment, "UPDATE",
                         "Shared library " + sharedLibrary.getName() + " update requested by WS" );
        UpdateLog updateLog = new UpdateLog( "Shared library " + sharedLibrary.getName() + " update in progress ...",
                                             environment.getName(), environment );

        // send a notification and waiting for the count down
        LOGGER.info( "Send a notification and waiting for the count down" );
        NotifierUtils.waitAndNotify( environment );

        try
        {
            // call updater
            LOGGER.debug( "Call shared library updater" );
            SharedLibraryUpdater.update( environment, applicationServer, sharedLibrary, updateLog );
        }
        catch ( Exception e )
        {
            LOGGER.error( "Shared library {} update failed", sharedLibrary.getName(), e );
            EventUtils.post( environment, "ERROR",
                             "Shared library " + sharedLibrary.getName() + " update failed: " + e.getMessage() );
            updateLog.setStatus( "Shared library " + sharedLibrary.getName() + " update failed" );
            updateLog.addUpdateMessage( new UpdateMessage( "error", "Shared library " + sharedLibrary.getName()
                + " update failed: " + e.getMessage() ) );
            PublisherUtils.publish( environment );
            throw new UpdateException( "Shared library " + sharedLibrary.getName() + " update failed", e );
        }

        // update completed.
        LOGGER.info( "Shared library {} updated", sharedLibrary.getName() );
        if ( updateLog.isUpdated() )
        {
            updateLog.setStatus( "Shared library " + sharedLibrary.getName() + " updated" );
        }
        else
        {
            updateLog.setStatus( "Shared library " + sharedLibrary.getName() + " already up to date" );
        }
        updateLog.addUpdateMessage(
            new UpdateMessage( "info", "Shared library " + sharedLibrary.getName() + " updated" ) );
        LOGGER.info( "Publishing update report" );
        PublisherUtils.publish( environment );
    }

    /**
     * Check if a shared library is up to date or not via WS.
     *
     * @param environmentName   the target environment name.
     * @param serverName        the target JEE application server name.
     * @param sharedLibraryName the target shared library name.
     * @return true if the shared library is up to date, false else.
     * @throws KalumetException in case of check failure.
     */
    public static boolean check( String environmentName, String serverName, String sharedLibraryName )
        throws KalumetException
    {
        LOGGER.info( "Shared library {} status check requested by WS", sharedLibraryName );

        // load configuration
        LOGGER.debug( "Loading configuration" );
        Kalumet kalumet = Kalumet.digeste( Configuration.CONFIG_LOCATION );

        // looking for component objects
        LOGGER.debug( "Looking for component objects" );
        Environment environment = kalumet.getEnvironment( environmentName );
        if ( environment == null )
        {
            LOGGER.error( "Environment {} is not found in the configuration", environmentName );
            throw new KalumetException( "Environment " + environmentName + " is not found in the configuration" );
        }
        JEEApplicationServer applicationServer =
            environment.getJEEApplicationServers().getJEEApplicationServer( serverName );
        if ( applicationServer == null )
        {
            LOGGER.error( "JEE application server {} is not found in environment {}", serverName,
                          environment.getName() );
            throw new KalumetException(
                "JEE application server " + serverName + " is not found in environment " + environment.getName() );
        }
        SharedLibrary sharedLibrary = applicationServer.getSharedLibrary( sharedLibraryName );
        if ( sharedLibrary == null )
        {
            LOGGER.error( "Shared library {} is not found in JEE application server {}", sharedLibraryName,
                          applicationServer.getName() );
            throw new KalumetException(
                "Shared library " + sharedLibraryName + " is not found in JEE application server "
                    + applicationServer.getName() );
        }

        try
        {
            // get JEE application server controller
            LOGGER.debug( "Getting JEE application server controller" );
            JEEApplicationServerController controller =
                JEEApplicationServerControllerFactory.getController( environment, applicationServer );
            // replaces variables in shared library class path.
            LOGGER.debug( "Replacing variables into the shared library classpath" );
            String classpath = VariableUtils.replace( sharedLibrary.getClasspath(), environment.getVariables() );
            // check shared library using controller.
            LOGGER.debug( "Checking status of the shared library using controller" );
            return controller.isSharedLibraryUpToDate( sharedLibrary.getName(), classpath );
        }
        catch ( Exception e )
        {
            LOGGER.error( "Shared library {} status check failed", sharedLibrary.getName(), e );
            throw new KalumetException( "Shared library " + sharedLibrary.getName() + " status check failed", e );
        }
    }

}