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package ftp;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import javax.swing.JOptionPane;
import javax.swing.SwingWorker;
import models.Image;
import models.SessionData;
import org.apache.commons.io.FileUtils;
import org.apache.log4j.Logger;
import org.apache.thrift.TException;
import config.Config;
import util.ResourceLoader;
/**
* Execute file download in a background thread and update the progress.
*
* @author www.codejava.net
*
*/
public class DownloadTask extends SwingWorker<Void, Void> {
/**
* Logger instance for this class.
*/
private final static Logger LOGGER = Logger.getLogger(DownloadTask.class);
private static final int BUFFER_SIZE = 8 * 1024 * 1024;
private static final double UPDATE_INTERVAL_SECONDS = 0.6;
private static final double UPDATE_INTERVAL_MS = UPDATE_INTERVAL_SECONDS * 1000;
private static final double BYTES_PER_MIB = 1024 * 1024;
private String host;
private int port;
private String username;
private String password;
private String downloadPath;
private String saveDir;
private int percentCompleted;
public DownloadTask(String host, int port, String username,
String password, String downloadPath, String saveDir) {
this.host = host;
this.port = port;
this.username = username;
this.password = password;
this.downloadPath = downloadPath;
this.saveDir = saveDir;
}
/**
* Executed in background thread
*/
@Override
protected Void doInBackground() throws Exception {
FTPUtility util = new FTPUtility(host, port, username, password);
try {
util.connect();
// show filesize in the GUI
long fileSize = util.getFileSize(downloadPath);
firePropertyChange("filesize", 0, fileSize);
util.downloadFile(downloadPath);
// prepare the input/output streams
String fileName = new File(downloadPath).getName();
File downloadFile = new File(saveDir + File.separator + fileName);
FileOutputStream outputStream = new FileOutputStream(downloadFile);
InputStream inputStream = util.getInputStream();
// initialize the counters needed for speed calculations
percentCompleted = 0;
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead = -1;
long totalBytesRead = 0;
long lastUpdate = 0;
long lastBytes = 0;
long currentBytes = 0;
while ((bytesRead = inputStream.read(buffer)) != -1 && !isCancelled()) {
outputStream.write(buffer, 0, bytesRead);
currentBytes += bytesRead;
totalBytesRead += bytesRead;
long now = System.currentTimeMillis();
if (lastUpdate + UPDATE_INTERVAL_MS < now) {
percentCompleted = (int) ((totalBytesRead * 100) / fileSize);
setProgress(percentCompleted);
lastBytes = (lastBytes * 2 + currentBytes) / 3;
final double speed = lastBytes / UPDATE_INTERVAL_SECONDS;
firePropertyChange("speed", 0, speed / BYTES_PER_MIB);
firePropertyChange("bytesread", 0, totalBytesRead);
lastUpdate = now;
currentBytes = 0;
}
}
// finalize the download by updating the progress bar one last time
// (in case we didn't get to do it because of the time interval)
percentCompleted = (int) ((totalBytesRead * 100) / fileSize);
setProgress(percentCompleted);
firePropertyChange("bytesread", 0, totalBytesRead);
outputStream.close();
util.finish();
} catch (FTPException ex) {
JOptionPane.showMessageDialog(null,
"Error downloading file: " + ex.getMessage(), "Error",
JOptionPane.ERROR_MESSAGE);
ex.printStackTrace();
setProgress(0);
cancel(true);
} finally {
util.disconnect();
}
return null;
}
/**
* Executed in Swing's event dispatching thread
*/
@Override
protected void done() {
if (!isCancelled() && percentCompleted==100) {
LOGGER.info("Datei erfolgreich heruntergeladen.");
String vmxResult = "";
vmxResult = generateVmx() ? "Passende VMX generiert." : "Keine passende VMX generiert!";
JOptionPane.showMessageDialog(null,
"Datei erfolgreich heruntergeladen. " + vmxResult, "Message",
JOptionPane.INFORMATION_MESSAGE);
} else if(!isCancelled() && percentCompleted != 100){
LOGGER.error("Datei wurde unvollständig heruntergeladen.");
JOptionPane.showMessageDialog(null,
"Datei wurde unvollständig heruntergeladen. Bitte wiederholen.", "Message",
JOptionPane.INFORMATION_MESSAGE);
}
}
/**
* Helper to generate the vmx for the downloaded image
* @return true|false indicating the success of the file creation
*/
private boolean generateVmx() {
String vmxTemplate = ResourceLoader.getTextFile("/txt/vmx_template");
// TODO: sanity checks on vmxTemplate would be good here... just to be safe
// now we replace the placeholder variables with the real data
// for this, we first need to get the image information from the server
LOGGER.debug("Image's ID: " + Image.image.getImageId());
Map<String, String> imageData = null;
try {
imageData = models.Client.clientcon.getClient().getImageData(Image.image.getImageId(), Image.image.getVersion(), SessionData.session.getAuthToken());
} catch (TException e) {
LOGGER.error("Thrift exception during transfer, see trace: ", e);
return false;
}
// sanity check, shouldn't happen.
if (imageData == null) {
LOGGER.error("Could not query the image information from the server!");
LOGGER.error("Image's ID: " + Image.image.getImageId());
LOGGER.error("Image's version: " + Image.image.getVersion());
return false;
}
// TODO: sanity checks on the content of imageData would be good here...
// use the information we received about the image
vmxTemplate = vmxTemplate.replace("%VM_DISPLAY_NAME%", imageData.get("name"));
vmxTemplate = vmxTemplate.replace("%VM_GUEST_OS%", imageData.get("os"));
vmxTemplate = vmxTemplate.replace("%VM_CPU_COUNT%", imageData.get("cpu"));
vmxTemplate = vmxTemplate.replace("%VM_RAM_SIZE%", String.valueOf(Integer.valueOf(imageData.get("ram")) * 1024));
vmxTemplate = vmxTemplate.replace("%VM_DISK_PATH%", imageData.get("path").replaceFirst("^prod/", ""));
// build filename for the vmx, basicly the same as the path of the vmdk
// just without the leading "prod/" and "vmx" instead of "vmdk" at the end.
String targetFilename = saveDir + File.separator +
imageData.get("path").replaceFirst("^prod/", "").replaceFirst("\\.vmdk$", "") + ".vmx";
try {
// try to write it to file
FileUtils.writeStringToFile(new File(targetFilename), vmxTemplate, StandardCharsets.UTF_8);
} catch (IOException e) {
LOGGER.error("Could not write vmx-template to '" + targetFilename + "'. See trace: ", e);
return false;
}
return true;
}
}
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