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path: root/gearman/controllerWorker/ControllerWorker/Shutdown.java
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package ControllerWorker;

import java.io.IOException;
import java.lang.Thread;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.StringTokenizer;
import java.util.Vector;

import org.gearman.client.GearmanClient;
import org.gearman.client.GearmanClientImpl;
import org.gearman.client.GearmanJob;
import org.gearman.client.GearmanJobImpl;
import org.gearman.client.GearmanJobResult;
import org.gearman.client.GearmanJobStatus;
import org.gearman.common.GearmanJobServerConnection;
import org.gearman.common.GearmanNIOJobServerConnection;
import org.gearman.util.ByteUtils;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;

import org.apache.log4j.Logger;

public class Shutdown extends Thread {
	private static final Logger logger = ControllerWorkerMain.getLogger();

	private String eventName;
	private Boolean force;
	private Vector<Client> clients;
	private final int updateRate;
	private long waitTime;
	private long scsavTime;
	private Vector<String> psWhitelist;
	private Vector<String> psBlacklist;

	private final GearmanJobServerConnection gearmanConnection;
	private GearmanClient gearmanClient;
	private Boolean finished;
	private Boolean error;

	public Shutdown(String eventName, Boolean force, Vector<Client> clients,
			int updateRate, long waitTime, long scsavTime,
			Vector<String> psWhitelist, Vector<String> psBlacklist,
			String gearmanServerAddress, int gearmanServerPort) {
		this.eventName = eventName;
		this.force = force;
		this.clients = clients;
		this.updateRate = updateRate; // updates per second
		this.waitTime = waitTime * 1000;
		this.scsavTime = scsavTime * 1000;
		this.psWhitelist = psWhitelist;
		this.psBlacklist = psBlacklist;
		gearmanConnection = new GearmanNIOJobServerConnection(
				gearmanServerAddress, gearmanServerPort);
		gearmanClient = new GearmanClientImpl();
		gearmanClient.addJobServer(gearmanConnection);
		finished = false;
		error = false;
	}

	public void run() {
		workerLoop();
	}

	private void workerLoop() {
		long beginTime;
		long timeTaken;
		long timeLeft;
		final long updatePeriod = 1000000000L / updateRate; // nanoseconds;
		Boolean run = true;
		while (run) {
			try {
				beginTime = System.nanoTime();
				run = update();
				timeTaken = System.nanoTime() - beginTime;
				timeLeft = (updatePeriod - timeTaken) / 1000000;
				if (timeLeft < 10)
					timeLeft = 10;
				sleep(timeLeft);
			} catch (Exception e) {
				logger.error(e.toString());
			}
		}
		finished = true;
		LinkedHashMap<String, Object> jsonData = new LinkedHashMap<String, Object>();
		jsonData.put("eventName", eventName);
		jsonData.put("type", "finishShutdownState");
		if (error) {
			logger.error("Shutdown of " + eventName + " failed");
			jsonData.put("error", true);
		} else {
			logger.info("Shutdown of " + eventName + " finished");
			jsonData.put("error", false);
		}
		String dataString = JSONValue.toJSONString(jsonData);
		GearmanJob job = GearmanJobImpl.createJob("status", dataString
				.getBytes(), "status" + eventName);
		gearmanClient.submit(job);
	}

	/*
	 * -------------- shutdown logik --------------
	 */

	private Boolean update() throws Exception {
		for (Client client : clients) {
			switch (client.getState()) {

			case CLIENT_UNKNOWN:
				ping(client);

				break;

			case CHECK_PING_PROGRESS:
				checkPingProgress(client);

				break;

			case CLIENT_IS_ALIVE:
				who(client);

				break;

			case CHECK_WHO_PROGRESS:
				checkWhoProgress(client);

				break;

			case SHUTDOWN_CLIENT:
				doShutdown(client);

				break;

			case CHECK_SHUTDOWN_PROGRESS:
				checkShutdownProgress(client);

				break;

			case SHUTDOWN_COMMAND_SENT:
				Date date = new Date();
				Long timestamp = date.getTime();
				client.addPingTime(ClientPingTime.SHUTDOWN, timestamp);
				pingShutdown(client);

				break;

			case PING_SHUTDOWN_AGAIN:
				pingShutdown(client);

				break;

			case CHECK_PING_SHUTDOWN_PROGRESS:
				checkPingShutdwonProgress(client);

				break;

			case USER_IS_LOGGED_IN:
				if (force) {
					logger.info(client.getIp() + " force is enabled");
					// is not working
					client.setState(ClientState.SHUTDOWN_CLIENT, gearmanClient);
				} else {
					ps(client);
				}

				break;

			case CHECK_PS_PROGRESS:
				checkPsProgress(client);

				break;

			case USERPROCESSES_ARE_RUNNING:
				ls(client);

				break;

			case CHECK_LS_PROGRESS:
				checkLsProgress(client);

				break;

			case USER_IS_WORKING:
				logger.error(client.getIp() + " User has been working");
				client.setError("The user has been working.");
				client.setState(ClientState.SHUTDOWN_ERROR, gearmanClient);
				break;

			case SHUTDOWN_ERROR:
				if (!client.isFinished()) {
					logger.error(client.getIp() + " Shutdown failed"); // errorState
					client.finish();
					error = true;
				}

				break;

			case SHUTDOWN_SUCCESS:
				if (!client.isFinished()) {
					logger.info(client.getIp() + " Shutdown finished"); // successState
					client.finish();
				}

				break;

			}
		}

		boolean allFinished = false;
		for (Client client : clients) {
			if (client.isFinished()) {
				allFinished = true;
			} else {
				allFinished = false;
				break;
			}
		}

		if (allFinished) {
			return false;
		} else {
			return true;
		}
	}

	/*
	 * ------------------------- function declarations -------------------------
	 */

	private void ping(Client client) {
		GearmanJob job = GearmanJobImpl.createJob("ping", client.getIp()
				.getBytes(), "ping" + client.getId());
		gearmanClient.submit(job);
		client.setState(ClientState.CHECK_PING_PROGRESS, gearmanClient);
		client.addJob(ClientJob.PINGJOB, job);
		logger.info("ping " + client.getIp());
	}

	private void checkPingProgress(Client client) throws Exception, IOException {
		GearmanJob pingJob = client.getJob(ClientJob.PINGJOB);

		if (pingJob != null) {
			GearmanJobStatus jobStatus = gearmanClient.getJobStatus(pingJob);

			if (!jobStatus.isKnown() && pingJob.isDone()) {
				GearmanJobResult pingJobRes = pingJob.get();
				String result = ByteUtils
						.fromUTF8Bytes(pingJobRes.getResults());

				if (!result.isEmpty()) {
					JSONObject resultObj = (JSONObject) JSONValue.parse(result);
					if (!resultObj.containsKey("err")) {
						String alive = resultObj.get("alive").toString();

						if (alive.equals("true")) {
							logger.info(client.getIp() + " alive");
							client.setState(ClientState.CLIENT_IS_ALIVE,
									gearmanClient);
							// check
							// Users
							client.removeJob(pingJob);
						} else if (alive.equals("false")) {
							logger.info(client.getIp() + " not alive");
							// not alive, go in successState
							client.setState(ClientState.SHUTDOWN_SUCCESS,
									gearmanClient);
							client.removeJob(pingJob);
						}
					} else {
						logger.error(client.getIp()
								+ " Cannot send the ping message.");
						client
								.setError("Sending the ping message has been failed.");
						// sending the ping message has been failed
						client.setState(ClientState.SHUTDOWN_ERROR,
								gearmanClient);
						client.removeJob(pingJob);
					}
				}
			}
		}
	}

	private void who(Client client) {
		GearmanJob job = GearmanJobImpl.createJob("who", client.getIp()
				.getBytes(), "who" + client.getId());
		gearmanClient.submit(job);
		client.setState(ClientState.CHECK_WHO_PROGRESS, gearmanClient);
		client.addJob(ClientJob.WHOJOB, job);
		logger.info("who " + client.getIp());
	}

	private void checkWhoProgress(Client client) throws Exception, IOException {
		GearmanJob whoJob = client.getJob(ClientJob.WHOJOB);

		if (whoJob != null) {
			GearmanJobStatus jobStatus = gearmanClient.getJobStatus(whoJob);

			if (!jobStatus.isKnown() && whoJob.isDone()) {
				GearmanJobResult whoJobRes = whoJob.get();
				String result = ByteUtils.fromUTF8Bytes(whoJobRes.getResults());

				if (!result.isEmpty()) {
					JSONObject resultObj = (JSONObject) JSONValue.parse(result);
					if (!resultObj.containsKey("err")) {
						String rawoutput = resultObj.get("rawoutput")
								.toString();
						StringTokenizer str = new StringTokenizer(rawoutput,
								" ");
						String user = "";
						if (str.hasMoreTokens()) {
							user = str.nextToken();
						}

						if (user.isEmpty()) {
							logger.info(client.getIp()
									+ " no user is logged in -CHECK PS-");
							// no user is logged in
							// -----
							// didn´t work in test-pool, check ps
							client.setState(ClientState.USER_IS_LOGGED_IN,
									gearmanClient);
							client.removeJob(whoJob);
						} else {
							logger
									.info(client.getIp()
											+ " a user is logged in");
							// a user is logged in
							client.setState(ClientState.USER_IS_LOGGED_IN,
									gearmanClient);
							client.removeJob(whoJob);
						}
					} else {
						logger.error(client.getIp()
								+ " Cannot check if a user is logged in.");
						client
								.setError("The check if a user is logged in has been failed.");
						/*
						 * cannot check if a user is logged in, go in errorState
						 */
						client.setState(ClientState.SHUTDOWN_ERROR,
								gearmanClient);
						client.removeJob(whoJob);
					}
				}
			}
		}
	}

	private void doShutdown(Client client) {
		GearmanJob job = GearmanJobImpl.createJob("doShutdown", client.getIp()

		.getBytes(), "doShutdown" + client.getId());
		gearmanClient.submit(job);
		client.setState(ClientState.CHECK_SHUTDOWN_PROGRESS, gearmanClient);
		client.addJob(ClientJob.SHUTDOWNJOB, job);
		logger.info("doShutdown " + client.getIp());
	}

	private void checkShutdownProgress(Client client) throws Exception,
			IOException {
		GearmanJob doShutdownJob = client.getJob(ClientJob.SHUTDOWNJOB);

		if (doShutdownJob != null) {
			GearmanJobStatus jobStatus = gearmanClient
					.getJobStatus(doShutdownJob);

			if (!jobStatus.isKnown() && doShutdownJob.isDone()) {
				GearmanJobResult wolJobRes = doShutdownJob.get();
				String result = ByteUtils.fromUTF8Bytes(wolJobRes.getResults());
				if (!result.isEmpty()) {
					JSONObject resultObj = (JSONObject) JSONValue.parse(result);
					if (!resultObj.containsKey("err")) {
						logger.info(client.getIp() + " Shutdown command sent");
						client.setState(ClientState.SHUTDOWN_COMMAND_SENT,
								gearmanClient);
						client.removeJob(doShutdownJob);
					} else {
						logger.error(client.getIp()
								+ " Cannot send shutdown command");
						client
								.setError("Sending the shutdown command has been failed.");
						// cannot send shutdown command, go in / errorState
						client.setState(ClientState.SHUTDOWN_ERROR,
								gearmanClient);
						client.removeJob(doShutdownJob);
					}
				}
			}
		}
	}

	private void pingShutdown(Client client) {
		GearmanJob job = GearmanJobImpl.createJob("ping", client.getIp()
				.getBytes(), "ping" + client.getId());
		gearmanClient.submit(job);
		client
				.setState(ClientState.CHECK_PING_SHUTDOWN_PROGRESS,
						gearmanClient);
		client.addJob(ClientJob.PINGJOB, job);
		logger.info("ping " + client.getIp());
	}

	private void checkPingShutdwonProgress(Client client) throws Exception,
			IOException {
		GearmanJob pingJobShutdown = client.getJob(ClientJob.PINGJOB);

		if (pingJobShutdown != null) {
			Date currentDate = new Date();
			Long currentTimestamp = currentDate.getTime();
			// wait 2 min until shutdown
			Long expectedTimestamp = client
					.getPingTime(ClientPingTime.SHUTDOWN)
					+ waitTime;
			if (expectedTimestamp >= currentTimestamp) {
				GearmanJobStatus jobStatus = gearmanClient
						.getJobStatus(pingJobShutdown);
				if (!jobStatus.isKnown() && pingJobShutdown.isDone()) {
					GearmanJobResult pingJobRes = pingJobShutdown.get();
					String result = ByteUtils.fromUTF8Bytes(pingJobRes
							.getResults());
					if (!result.isEmpty()) {
						JSONObject resultObj = (JSONObject) JSONValue
								.parse(result);
						if (!resultObj.containsKey("err")) {
							String alive = resultObj.get("alive").toString();
							if (alive.equals("false")) {
								logger.info(client.getIp()
										+ " is not alive anymore");
								client.setState(ClientState.SHUTDOWN_SUCCESS,
										gearmanClient);
								client.removeJob(pingJobShutdown);
							} else if (alive.equals("true")) {
								logger
										.info(client.getIp()
												+ " is still alive after shutdown command");
								client.setState(
										ClientState.PING_SHUTDOWN_AGAIN,
										gearmanClient);
								client.removeJob(pingJobShutdown);
							}
						} else {
							logger
									.error(client.getIp()
											+ " Cannot send the ping after shutdown message.");
							client
									.setError("Sending the ping after shutdown message has been failed.");
							/*
							 * sending the ping after shutdown message has been
							 * failed
							 */
							client.setState(ClientState.SHUTDOWN_ERROR,
									gearmanClient);
							client.removeJob(pingJobShutdown);
						}
					}
				}
			} else {
				logger.error(client.getIp() + " is alive after shutdown");
				client.setError("Client is still alive after shutdown.");
				// still alive, go in errorState
				client.setState(ClientState.SHUTDOWN_ERROR, gearmanClient);
				client.removeJob(pingJobShutdown);
			}
		}
	}

	private void ps(Client client) {
		GearmanJob job = GearmanJobImpl.createJob("ps", client.getIp()
				.getBytes(), "ps" + client.getId());
		gearmanClient.submit(job);
		client.setState(ClientState.CHECK_PS_PROGRESS, gearmanClient);
		client.addJob(ClientJob.PSJOB, job);
		logger.info("ps " + client.getIp());
	}

	private void checkPsProgress(Client client) throws Exception, IOException {
		GearmanJob psJob = client.getJob(ClientJob.PSJOB);

		if (psJob != null) {
			GearmanJobStatus jobStatus = gearmanClient.getJobStatus(psJob);

			if (!jobStatus.isKnown() && psJob.isDone()) {
				GearmanJobResult whoJobRes = psJob.get();
				String result = ByteUtils.fromUTF8Bytes(whoJobRes.getResults());

				if (!result.isEmpty()) {
					JSONObject resultObj = (JSONObject) JSONValue.parse(result);
					if (!resultObj.containsKey("err")) {
						JSONArray ps = (JSONArray) resultObj.get("ps");
						HashMap<String, HashMap<String, Integer>> psMap = new HashMap<String, HashMap<String, Integer>>();

						for (Object obj : ps) {
							HashMap<String, Integer> psEntry = new HashMap<String, Integer>();
							JSONObject psLine = (JSONObject) obj;
							String cmd = psLine.get("cmd").toString();
							int pid = Integer.parseInt(psLine.get("pid")
									.toString());
							int ppid = Integer.parseInt(psLine.get("ppid")
									.toString());
							psEntry.put("pid", pid);
							psEntry.put("ppid", ppid);
							psMap.put(cmd, psEntry);
						}

						boolean whitelistFound = false;
						boolean blacklistFound = false;

						for (String blackEntry : psBlacklist) {
							if (psMap.containsKey(blackEntry)) {
								blacklistFound = true;
								break;
							}
						}

						for (String whiteEntry : psWhitelist) {
							if (psMap.containsKey(whiteEntry)) {
								HashMap<String, Integer> psEntry = psMap
										.get(whiteEntry);
								if (whiteEntry.equals("gnome-screensav")) {
									if (psEntry.get("ppid") != 1) {
										client.setScsavPID(psEntry.get("pid"));
										whitelistFound = true;
										break;
									}
								} else {
									client.setScsavPID(psEntry.get("pid"));
									whitelistFound = true;
									break;
								}
							}
						}

						if (blacklistFound) {
							if (whitelistFound) {
								logger.info(client.getIp()
										+ " processes are running");
								client.setState(
										ClientState.USERPROCESSES_ARE_RUNNING,
										gearmanClient);
							} else {
								logger.info(client.getIp() + " is working");
								// client.setState(ClientState.USERPROCESSES_ARE_RUNNING,
								client.setState(ClientState.USER_IS_WORKING,
										gearmanClient);
							}
							client.removeJob(psJob);
						} else {
							logger.info(client.getIp() + " is not working");
							// is not working
							client.setState(ClientState.SHUTDOWN_CLIENT,
									gearmanClient);
							client.removeJob(psJob);
						}
					} else {
						logger.error(client.getIp()
								+ " Cannot check if user is working.");
						client
								.setError("The check if a user is working has been failed.");
						/*
						 * cannot check if user is working, go in errorState
						 */
						client.setState(ClientState.SHUTDOWN_ERROR,
								gearmanClient);
						client.removeJob(psJob);
					}
				} else {
					logger.error(client.getIp()
							+ " Cannot check if user is working.");
					client
							.setError("The check if a user is working has been failed.");
					/*
					 * cannot check if user is working, go in errorState
					 */
					client.setState(ClientState.BOOT_ERROR, gearmanClient);
					client.removeJob(psJob);
				}
			}
		}
	}

	// screensaver check
	private void ls(Client client) {
		GearmanJob job = GearmanJobImpl.createJob("ls", client.getIp()
				.getBytes(), "ls" + client.getId());
		gearmanClient.submit(job);
		client.setState(ClientState.CHECK_LS_PROGRESS, gearmanClient);
		client.addJob(ClientJob.LSJOB, job);
		logger.info("ls " + client.getIp());
	}

	private void checkLsProgress(Client client) throws Exception, IOException {
		GearmanJob lsJob = client.getJob(ClientJob.LSJOB);

		if (lsJob != null) {
			GearmanJobStatus jobStatus = gearmanClient.getJobStatus(lsJob);

			if (!jobStatus.isKnown() && lsJob.isDone()) {
				GearmanJobResult psJobRes = lsJob.get();
				String result = ByteUtils.fromUTF8Bytes(psJobRes.getResults());

				if (!result.isEmpty()) {
					JSONObject resultObj = (JSONObject) JSONValue.parse(result);
					if (!resultObj.containsKey("err")) {
						JSONArray ls = (JSONArray) resultObj.get("ls");
						HashMap<String, Long> lsMap = new HashMap<String, Long>();

						for (Object obj : ls) {
							JSONObject lsLine = (JSONObject) obj;
							String name = lsLine.get("name").toString();
							SimpleDateFormat df = new SimpleDateFormat(
									"y-M-d H:m");
							Date date = df.parse(lsLine.get("date").toString()
									+ " " + lsLine.get("time").toString());
							long timestamp = date.getTime();
							lsMap.put(name, timestamp);
						}

						String scsavPID = Integer
								.toString(client.getScsavPID());
						long scsavTimestamp = lsMap.get(scsavPID);
						Date date = new Date();
						long currentTimestamp = date.getTime();
						long beetweenTimestamp = currentTimestamp
								- scsavTimestamp;

						if (beetweenTimestamp < scsavTime) {
							logger
									.info(client.getIp()
											+ " screensaver has been running shorter than "
											+ scsavTime / (1000 * 60)
											+ " minutes, user is working.");
							client.setState(ClientState.USER_IS_WORKING,
									gearmanClient);
							client.removeJob(lsJob);
						} else {
							logger
									.info(client.getIp()
											+ " screensaver has been running longer than "
											+ scsavTime / (1000 * 60)
											+ " minutes, user is not working.");
							client.setState(ClientState.RESTART_CLIENT,
									gearmanClient);
							client.removeJob(lsJob);
						}
					} else {
						logger.error(client.getIp()
								+ " Cannot check 'ls -al' of /proc/");
						client
								.setError("The check for screensaver has been failed.");
						// cannot check ls, go in errorState
						client.setState(ClientState.BOOT_ERROR, gearmanClient);
						client.removeJob(lsJob);
					}
				} else {
					logger.error(client.getIp()
							+ " Cannot check 'ls -al' of /proc/");
					client
							.setError("The check for screensaver has been failed.");
					// cannot check ls, go in errorState
					client.setState(ClientState.BOOT_ERROR, gearmanClient);
					client.removeJob(lsJob);
				}
			}
		}
	}

	// ------------------

	public Boolean isFinished() {
		return finished && !error;
	}

	public Boolean isFinishedWithErrors() {
		return finished && error;
	}

	public Vector<Client> getClients() {
		return clients;
	}

	public String getEventName() {
		return eventName;
	}
}