/**
* Populates attribute fields with data from the MasterInfo associated with this servlet. Errors
* will be displayed in an error field. Debugging can be enabled to display additional data. Will
* eventually redirect the request to a jsp.
*
* @param request The HttpServletRequest object
* @param response The HttpServletResponse object
* @throws ServletException
* @throws IOException
* @throws UnknownHostException
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException, UnknownHostException {
request.setAttribute("debug", Constants.DEBUG);
request.setAttribute("masterNodeAddress", mMasterInfo.getMasterAddress().toString());
request.setAttribute("invalidPathError", "");
List<ClientFileInfo> filesInfo = null;
String currentPath = request.getParameter("path");
if (currentPath.isEmpty()) {
currentPath = "/";
}
request.setAttribute("currentPath", currentPath);
try {
UiFileInfo currentFileInfo = new UiFileInfo(mMasterInfo.getFileInfo(currentPath));
request.setAttribute("currentDirectory", currentFileInfo);
if (!currentFileInfo.getIsDirectory()) {
displayFile(currentFileInfo.getAbsolutePath(), request);
getServletContext().getRequestDispatcher("/viewFile.jsp").forward(request, response);
return;
}
CommonUtils.validatePath(currentPath);
setPathDirectories(currentPath, request);
filesInfo = mMasterInfo.getFilesInfo(currentPath);
} catch (FileDoesNotExistException fdne) {
request.setAttribute("invalidPathError", "Error: Invalid Path " + fdne.getMessage());
getServletContext().getRequestDispatcher("/browse.jsp").forward(request, response);
return;
} catch (InvalidPathException ipe) {
request.setAttribute("invalidPathError", "Error: Invalid Path " + ipe.getLocalizedMessage());
getServletContext().getRequestDispatcher("/browse.jsp").forward(request, response);
return;
}
List<UiFileInfo> fileInfos = new ArrayList<UiFileInfo>(filesInfo.size());
for (ClientFileInfo fileInfo : filesInfo) {
UiFileInfo toAdd = new UiFileInfo(fileInfo);
try {
if (!toAdd.getIsDirectory()) {
toAdd.setFileLocations(mMasterInfo.getFileLocations(toAdd.getId()));
}
} catch (FileDoesNotExistException fdne) {
request.setAttribute("invalidPathError", "Error: Invalid Path " + fdne.getMessage());
getServletContext().getRequestDispatcher("/browse.jsp").forward(request, response);
return;
}
fileInfos.add(toAdd);
}
Collections.sort(fileInfos);
request.setAttribute("fileInfos", fileInfos);
getServletContext().getRequestDispatcher("/browse.jsp").forward(request, response);
}
/**
* This function displays the first 5KB of a file if it is in ASCII format.
*
* @param path The path of the file to display
* @param request The HttpServletRequest object
* @throws FileDoesNotExistException
* @throws IOException
* @throws InvalidPathException
* @throws TException
*/
private void displayFile(String path, HttpServletRequest request)
throws FileDoesNotExistException, InvalidPathException, IOException {
TachyonClient tachyonClient = TachyonClient.getClient(mMasterInfo.getMasterAddress());
TachyonFile tFile = tachyonClient.getFile(path);
if (tFile == null) {
throw new FileDoesNotExistException(path);
}
InStream is = tFile.getInStream(OpType.READ_NO_CACHE);
int len = Math.min(5 * Constants.KB, (int) tFile.getSize());
byte[] data = new byte[len];
is.read(data, 0, len);
String fileData = CommonUtils.convertByteArrayToString(data);
if (fileData == null) {
fileData = "The requested file is not completely encoded in ascii";
}
is.close();
try {
tachyonClient.close();
} catch (TException e) {
LOG.error(e.getMessage());
}
request.setAttribute("fileData", fileData);
return;
}
/**
* This function sets the fileinfos for folders that are in the path to the current directory.
*
* @param path The path of the current directory.
* @param request The HttpServletRequest object
* @throws FileDoesNotExistException
* @throws InvalidPathException
*/
private void setPathDirectories(String path, HttpServletRequest request)
throws FileDoesNotExistException, InvalidPathException {
if (path.equals(Constants.PATH_SEPARATOR)) {
request.setAttribute("pathInfos", new UiFileInfo[0]);
return;
}
String[] splitPath = path.split(Constants.PATH_SEPARATOR);
UiFileInfo[] pathInfos = new UiFileInfo[splitPath.length - 1];
String currentPath = Constants.PATH_SEPARATOR;
pathInfos[0] = new UiFileInfo(mMasterInfo.getFileInfo(currentPath));
for (int i = 1; i < splitPath.length - 1; i++) {
currentPath = currentPath + splitPath[i];
pathInfos[i] = new UiFileInfo(mMasterInfo.getFileInfo(currentPath));
currentPath = currentPath + Constants.PATH_SEPARATOR;
}
request.setAttribute("pathInfos", pathInfos);
return;
}