com.cws.esolutions.agent.processors.impl.ServiceCheckProcessorImpl.java Source code

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/*
 * Copyright (c) 2009 - 2017 CaspersBox Web Services
 *
 * 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.cws.esolutions.agent.processors.impl;

/*
 * Project: eSolutionsAgent
 * Package: com.cws.esolutions.agent.processors.impl
 * File: ApplicationManagerProcessorImpl.java
 *
 * History
 *
 * Author               Date                            Comments
 * ----------------------------------------------------------------------------
 * cws-khuntly   11/23/2008 22:39:20             Created.
 */
import java.io.File;
import java.net.Socket;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.BufferedWriter;
import java.net.SocketException;
import java.net.ConnectException;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.DefaultExecutor;
import org.apache.commons.exec.ExecuteWatchdog;
import org.apache.commons.exec.PumpStreamHandler;
import org.apache.commons.exec.ExecuteStreamHandler;
import org.apache.commons.io.output.ByteArrayOutputStream;
import org.apache.commons.exec.DefaultExecuteResultHandler;

import com.cws.esolutions.agent.enums.AgentStatus;
import com.cws.esolutions.agent.processors.dto.ServiceCheckRequest;
import com.cws.esolutions.agent.processors.dto.ServiceCheckResponse;
import com.cws.esolutions.agent.processors.exception.ServiceCheckException;
import com.cws.esolutions.agent.processors.interfaces.IServiceCheckProcessor;

/**
 * @see com.cws.esolutions.agent.processors.interfaces.IServiceCheckProcessor
 */
public class ServiceCheckProcessorImpl implements IServiceCheckProcessor {
    public ServiceCheckResponse runSystemCheck(final ServiceCheckRequest request) throws ServiceCheckException {
        final String methodName = IServiceCheckProcessor.CNAME
                + "#runSystemCheck(final ServiceCheckRequest request) throws ServiceCheckException";

        if (DEBUG) {
            DEBUGGER.debug(methodName);
            DEBUGGER.debug("ServiceCheckRequest: {}", request);
        }

        int exitCode = -1;
        Socket socket = null;
        File sourceFile = null;
        CommandLine command = null;
        BufferedWriter writer = null;
        ExecuteStreamHandler streamHandler = null;
        ByteArrayOutputStream outputStream = null;
        ServiceCheckResponse response = new ServiceCheckResponse();

        final DefaultExecutor executor = new DefaultExecutor();
        final ExecuteWatchdog watchdog = new ExecuteWatchdog(CONNECT_TIMEOUT * 1000);
        final DefaultExecuteResultHandler resultHandler = new DefaultExecuteResultHandler();

        try {
            switch (request.getRequestType()) {
            case NETSTAT:
                sourceFile = scriptConfig.getScripts().get("netstat");

                if (DEBUG) {
                    DEBUGGER.debug("sourceFile: {}", sourceFile);
                }

                if (!(sourceFile.canExecute())) {
                    throw new ServiceCheckException(
                            "Script file either does not exist or cannot be executed. Cannot continue.");
                }

                command = CommandLine.parse(sourceFile.getAbsolutePath());

                if (request.getPortNumber() != 0) {
                    command.addArgument(String.valueOf(request.getPortNumber()), true);
                }

                if (DEBUG) {
                    DEBUGGER.debug("CommandLine: {}", command);
                }

                outputStream = new ByteArrayOutputStream();
                streamHandler = new PumpStreamHandler(outputStream);

                executor.setWatchdog(watchdog);
                executor.setStreamHandler(streamHandler);

                if (DEBUG) {
                    DEBUGGER.debug("ExecuteStreamHandler: {}", streamHandler);
                    DEBUGGER.debug("ExecuteWatchdog: {}", watchdog);
                    DEBUGGER.debug("DefaultExecuteResultHandler: {}", resultHandler);
                    DEBUGGER.debug("DefaultExecutor: {}", executor);
                }

                executor.execute(command, resultHandler);

                resultHandler.waitFor();
                exitCode = resultHandler.getExitValue();

                if (DEBUG) {
                    DEBUGGER.debug("exitCode: {}", exitCode);
                }

                writer = new BufferedWriter(new FileWriter(LOGS_DIRECTORY + "/" + sourceFile.getName() + ".log"));
                writer.write(outputStream.toString());
                writer.flush();

                response.setResponseData(outputStream.toString());

                if (executor.isFailure(exitCode)) {
                    response.setRequestStatus(AgentStatus.FAILURE);
                } else {
                    response.setRequestStatus(AgentStatus.SUCCESS);
                }

                break;
            case REMOTEDATE:
                response.setRequestStatus(AgentStatus.SUCCESS);
                response.setResponseData(System.currentTimeMillis());

                break;
            case TELNET:
                response = new ServiceCheckResponse();

                int targetPort = request.getPortNumber();
                String targetServer = request.getTargetHost();

                if (DEBUG) {
                    DEBUGGER.debug("Target port: {}", targetPort);
                    DEBUGGER.debug("Target server: {}", targetServer);
                }

                if (targetPort == 0) {
                    throw new ServiceCheckException("Target port number was not assigned. Cannot action request.");
                }

                final String CRLF = "\r\n";
                final String TERMINATE_TELNET = "^]";

                synchronized (new Object()) {
                    InetSocketAddress socketAddress = new InetSocketAddress(targetServer, targetPort);

                    socket = new Socket();
                    socket.setSoTimeout(IServiceCheckProcessor.CONNECT_TIMEOUT);
                    socket.setSoLinger(false, 0);
                    socket.setKeepAlive(false);

                    try {
                        socket.connect(socketAddress, IServiceCheckProcessor.CONNECT_TIMEOUT);

                        if (!(socket.isConnected())) {
                            throw new ConnectException("Failed to connect to host " + targetServer + " on port "
                                    + request.getPortNumber());
                        }

                        PrintWriter pWriter = new PrintWriter(socket.getOutputStream(), true);
                        pWriter.println(TERMINATE_TELNET + CRLF);
                        pWriter.flush();
                        pWriter.close();

                        response.setRequestStatus(AgentStatus.SUCCESS);
                        response.setResponseData("Telnet connection to " + targetServer + " on port "
                                + request.getPortNumber() + " successful.");
                    } catch (ConnectException cx) {
                        response.setRequestStatus(AgentStatus.FAILURE);
                        response.setResponseData("Telnet connection to " + targetServer + " on port "
                                + request.getPortNumber() + " failed with message: " + cx.getMessage());
                    }
                }

                break;
            case PROCESSLIST:
                sourceFile = scriptConfig.getScripts().get("processList");

                if (DEBUG) {
                    DEBUGGER.debug("sourceFile: {}", sourceFile);
                }

                if (!(sourceFile.canExecute())) {
                    throw new ServiceCheckException(
                            "Script file either does not exist or cannot be executed. Cannot continue.");
                }

                command = CommandLine.parse(sourceFile.getAbsolutePath());

                if (request.getPortNumber() != 0) {
                    command.addArgument(String.valueOf(request.getPortNumber()), true);
                }

                if (DEBUG) {
                    DEBUGGER.debug("CommandLine: {}", command);
                }

                outputStream = new ByteArrayOutputStream();
                streamHandler = new PumpStreamHandler(outputStream);

                executor.setWatchdog(watchdog);
                executor.setStreamHandler(streamHandler);

                if (DEBUG) {
                    DEBUGGER.debug("ExecuteStreamHandler: {}", streamHandler);
                    DEBUGGER.debug("ExecuteWatchdog: {}", watchdog);
                    DEBUGGER.debug("DefaultExecuteResultHandler: {}", resultHandler);
                    DEBUGGER.debug("DefaultExecutor: {}", executor);
                }

                executor.execute(command, resultHandler);

                resultHandler.waitFor();
                exitCode = resultHandler.getExitValue();

                if (DEBUG) {
                    DEBUGGER.debug("exitCode: {}", exitCode);
                }

                writer = new BufferedWriter(new FileWriter(LOGS_DIRECTORY + "/" + sourceFile.getName() + ".log"));
                writer.write(outputStream.toString());
                writer.flush();

                response.setResponseData(outputStream.toString());

                if (executor.isFailure(exitCode)) {
                    response.setRequestStatus(AgentStatus.FAILURE);
                } else {
                    response.setRequestStatus(AgentStatus.SUCCESS);
                }

                break;
            default:
                // unknown operation
                throw new ServiceCheckException("No valid operation was specified");
            }
        } catch (UnknownHostException uhx) {
            ERROR_RECORDER.error(uhx.getMessage(), uhx);

            throw new ServiceCheckException(uhx.getMessage(), uhx);
        } catch (SocketException sx) {
            ERROR_RECORDER.error(sx.getMessage(), sx);

            throw new ServiceCheckException(sx.getMessage(), sx);
        } catch (IOException iox) {
            ERROR_RECORDER.error(iox.getMessage(), iox);

            throw new ServiceCheckException(iox.getMessage(), iox);
        } catch (InterruptedException ix) {
            ERROR_RECORDER.error(ix.getMessage(), ix);

            throw new ServiceCheckException(ix.getMessage(), ix);
        } finally {
            try {
                if (writer != null) {
                    writer.close();
                }

                if ((socket != null) && (!(socket.isClosed()))) {
                    socket.close();
                }
            } catch (IOException iox) {
                ERROR_RECORDER.error(iox.getMessage(), iox);
            }
        }

        return response;
    }
}