/// <exception cref="Javax.Servlet.ServletException"/>
/// <exception cref="System.IO.IOException"/>
protected override void DoGet(HttpServletRequest request, HttpServletResponse response
)
{
FileInputStream editFileIn = null;
try
{
ServletContext context = GetServletContext();
Configuration conf = (Configuration)GetServletContext().GetAttribute(JspHelper.CurrentConf
);
string journalId = request.GetParameter(JournalIdParam);
QuorumJournalManager.CheckJournalId(journalId);
JNStorage storage = JournalNodeHttpServer.GetJournalFromContext(context, journalId
).GetStorage();
// Check security
if (!CheckRequestorOrSendError(conf, request, response))
{
return;
}
// Check that the namespace info is correct
if (!CheckStorageInfoOrSendError(storage, request, response))
{
return;
}
long segmentTxId = ServletUtil.ParseLongParam(request, SegmentTxidParam);
FileJournalManager fjm = storage.GetJournalManager();
FilePath editFile;
lock (fjm)
{
// Synchronize on the FJM so that the file doesn't get finalized
// out from underneath us while we're in the process of opening
// it up.
FileJournalManager.EditLogFile elf = fjm.GetLogFile(segmentTxId);
if (elf == null)
{
response.SendError(HttpServletResponse.ScNotFound, "No edit log found starting at txid "
+ segmentTxId);
return;
}
editFile = elf.GetFile();
ImageServlet.SetVerificationHeadersForGet(response, editFile);
ImageServlet.SetFileNameHeaders(response, editFile);
editFileIn = new FileInputStream(editFile);
}
DataTransferThrottler throttler = ImageServlet.GetThrottler(conf);
// send edits
TransferFsImage.CopyFileToStream(response.GetOutputStream(), editFile, editFileIn
, throttler);
}
catch (Exception t)
{
string errMsg = "getedit failed. " + StringUtils.StringifyException(t);
response.SendError(HttpServletResponse.ScInternalServerError, errMsg);
throw new IOException(errMsg);
}
finally
{
IOUtils.CloseStream(editFileIn);
}
}
/// <exception cref="System.IO.IOException"/>
private bool CheckStorageInfoOrSendError(JNStorage storage, HttpServletRequest request
, HttpServletResponse response)
{
int myNsId = storage.GetNamespaceID();
string myClusterId = storage.GetClusterID();
string theirStorageInfoString = StringEscapeUtils.EscapeHtml(request.GetParameter
(StorageinfoParam));
if (theirStorageInfoString != null)
{
int theirNsId = StorageInfo.GetNsIdFromColonSeparatedString(theirStorageInfoString
);
string theirClusterId = StorageInfo.GetClusterIdFromColonSeparatedString(theirStorageInfoString
);
if (myNsId != theirNsId || !myClusterId.Equals(theirClusterId))
{
string msg = "This node has namespaceId '" + myNsId + " and clusterId '" + myClusterId
+ "' but the requesting node expected '" + theirNsId + "' and '" + theirClusterId
+ "'";
response.SendError(HttpServletResponse.ScForbidden, msg);
Log.Warn("Received an invalid request file transfer request from " + request.GetRemoteAddr
() + ": " + msg);
return(false);
}
}
return(true);
}
