mirror of
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285 lines
12 KiB
C#
285 lines
12 KiB
C#
/* Copyright (c) Cloud Software Group, Inc.
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*
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* Redistribution and use in source and binary forms,
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* with or without modification, are permitted provided
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* that the following conditions are met:
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*
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* * Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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using System;
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using System.ComponentModel;
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using System.IO;
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using System.Threading;
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using CommandLib;
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using XenAdmin.Core;
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using XenAdmin.Network;
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using XenAPI;
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using XenCenterLib.Archive;
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using XenCenterLib;
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namespace XenAdmin.Actions
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{
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public class ExportVmAction : AsyncAction
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{
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private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
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private readonly string _filename;
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private Exception _exception = null;
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private Export export;
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private readonly bool verify;
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/// <summary>
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/// RBAC dependencies needed to import appliance/export an appliance/import disk image.
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/// </summary>
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public static RbacMethodList StaticRBACDependencies
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{
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get
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{
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var list = new RbacMethodList("task.create", "http/get_export");
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list.AddRange(Role.CommonTaskApiList);
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list.AddRange(Role.CommonSessionApiList);
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return list;
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}
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="connection"></param>
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/// <param name="host">Used for filtering purposes. May be null.</param>
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/// <param name="vm"></param>
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/// <param name="filename"></param>
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/// <param name="verify"></param>
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public ExportVmAction(IXenConnection connection, Host host,
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VM vm, string filename, bool verify)
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: base(connection, string.Format(Messages.EXPORT_VM_TITLE, vm.Name(), Helpers.GetName(connection)),
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Messages.ACTION_EXPORT_DESCRIPTION_PREPARING)
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{
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#region RBAC Dependencies
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ApiMethodsToRoleCheck.Add("task.create");
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ApiMethodsToRoleCheck.AddRange(Role.CommonTaskApiList);
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ApiMethodsToRoleCheck.AddRange(Role.CommonSessionApiList);
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ApiMethodsToRoleCheck.Add("http/get_export");
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#endregion
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this.Pool = Helpers.GetPool(vm.Connection);
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this.Host = host;
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this.VM = vm;
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_filename = filename;
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this.verify = verify;
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}
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protected override void Run()
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{
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SafeToExit = false;
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Description = Messages.ACTION_EXPORT_DESCRIPTION_IN_PROGRESS;
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RelatedTask = Task.create(Session, "export", $"Exporting {VM.Name()} to backup file");
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UriBuilder uriBuilder = new UriBuilder(this.Session.Url);
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uriBuilder.Path = "export";
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uriBuilder.Query = string.Format("session_id={0}&uuid={1}&task_id={2}",
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Uri.EscapeDataString(this.Session.opaque_ref),
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Uri.EscapeDataString(this.VM.uuid),
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Uri.EscapeDataString(this.RelatedTask.opaque_ref));
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log.DebugFormat("Exporting {0} to {1}", VM.Name(), _filename);
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// The DownloadFile call will block, so we need a separate thread to poll for task status.
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Thread taskThread = new Thread(ProgressPoll);
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taskThread.Name = "Progress polling thread for ExportVmAction for " + VM.Name().Ellipsise(20);
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taskThread.IsBackground = true;
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taskThread.Start();
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// Create the file with a temporary name till it is fully downloaded
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String tmpFile = _filename + ".tmp";
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try
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{
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HttpGet(tmpFile, uriBuilder.Uri);
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}
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catch (Exception e)
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{
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if (XenAPI.Task.get_status(this.Session, this.RelatedTask.opaque_ref) == XenAPI.task_status_type.pending
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&& XenAPI.Task.get_progress(this.Session, this.RelatedTask.opaque_ref) == 0)
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{
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// If task is pending and has zero progress, it probably hasn't been started,
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// which probably means there was an exception in the GUI code before the
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// action got going. Stop the task so that we don't block forever on
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// taskThread.Join(). Brought to light by CA-11100.
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DestroyTask();
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}
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// Test for null: don't overwrite a previous exception
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if (_exception == null)
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_exception = e;
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}
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taskThread.Join();
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using (FileStream fs = new FileStream(tmpFile, FileMode.Append))
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{
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// Flush written data to disk
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if (!Win32.FlushFileBuffers(fs.SafeFileHandle))
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{
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Win32Exception exn = new Win32Exception(System.Runtime.InteropServices.Marshal.GetLastWin32Error());
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log.Error(string.Format("FlushFileBuffers failed in ExportVmAction with NativeErrorCode={0}",
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exn.NativeErrorCode), exn);
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}
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}
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if (verify && _exception == null)
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{
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long read = 0;
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int i = 0;
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long filesize = new FileInfo(tmpFile).Length / 50; //Div by 50 to save doing the * 50 in the callback
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void Callback(uint size)
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{
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read += size;
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i++;
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//divide number of updates by 10, so as not to spend all out time redrawing the control
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//but try and send an update every second to keep the timer ticking
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if (i > 10)
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{
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PercentComplete = 50 + (int)(read / filesize);
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i = 0;
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}
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}
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try
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{
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using (FileStream fs = new FileStream(tmpFile, FileMode.Open, FileAccess.Read))
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{
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log.DebugFormat("Verifying export of {0} in {1}", VM.Name(), _filename);
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this.Description = Messages.ACTION_EXPORT_VERIFY;
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export = new Export();
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export.verify(fs, null, () => Cancelling, Callback);
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}
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}
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catch (Exception e)
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{
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if (_exception == null)
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_exception = e;
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}
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}
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if (Cancelling || _exception is CancelledException)
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{
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log.InfoFormat("Export of VM {0} cancelled", VM.Name());
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this.Description = Messages.ACTION_EXPORT_DESCRIPTION_CANCELLED;
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log.DebugFormat("Deleting {0}", tmpFile);
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File.Delete(tmpFile);
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throw new CancelledException();
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}
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else if (_exception != null)
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{
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log.Warn(string.Format("Export of VM {0} failed", VM.Name()), _exception);
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if (_exception is HeaderChecksumFailed || _exception is FormatException)
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this.Description = Messages.ACTION_EXPORT_DESCRIPTION_HEADER_CHECKSUM_FAILED;
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else if (_exception is BlockChecksumFailed)
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this.Description = Messages.ACTION_EXPORT_DESCRIPTION_BLOCK_CHECKSUM_FAILED;
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else if (_exception is IOException && Win32.GetHResult(_exception) == Win32.ERROR_DISK_FULL)
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this.Description = Messages.ACTION_EXPORT_DESCRIPTION_DISK_FULL;
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else if (_exception is Failure && ((Failure)_exception).ErrorDescription[0] == Failure.VDI_IN_USE)
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this.Description = Messages.ACTION_EXPORT_DESCRIPTION_VDI_IN_USE;
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else
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this.Description = Messages.ACTION_EXPORT_DESCRIPTION_FAILED;
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var fi = new FileInfo(tmpFile);
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log.DebugFormat("Progress of the action until exception: {0}", PercentComplete);
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log.DebugFormat("Size file exported until exception: {0}", fi.Length);
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try
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{
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using (Stream stream = new FileStream(tmpFile, FileMode.Open, FileAccess.Read))
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using (var iterator = ArchiveFactory.Reader(ArchiveFactory.Type.Tar, stream))
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{
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while (iterator.HasNext())
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log.DebugFormat("Tar entry: {0} {1}", iterator.CurrentFileName(), iterator.CurrentFileSize());
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}
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}
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catch (Exception)
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{
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// ignored
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}
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log.DebugFormat("Deleting {0}", tmpFile);
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File.Delete(tmpFile);
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throw new Exception(Description);
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}
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else
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{
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log.InfoFormat("Export of VM {0} successful", VM.Name());
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this.Description = Messages.ACTION_EXPORT_DESCRIPTION_SUCCESSFUL;
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log.DebugFormat("Renaming {0} to {1}", tmpFile, _filename);
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if (File.Exists(_filename))
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File.Delete(_filename);
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File.Move(tmpFile, _filename);
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}
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}
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private void HttpGet(string filename, Uri uri)
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{
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using (FileStream fs = new FileStream(filename, FileMode.Create, FileAccess.Write))
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{
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using (Stream http = HTTPHelper.GET(uri, Connection, true))
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{
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new Export().verify(http, fs, () => Cancelling);
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}
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}
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}
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private void ProgressPoll()
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{
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try
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{
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PollToCompletion(0, verify ? 50 : 95);
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}
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catch (Failure e)
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{
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// Don't overwrite a previous exception unless we're sure that the one that
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// we have here is going to be more useful than the client one. Sometimes,
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// the server exception will be "failed to write", which is just in
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// response to us closing the stream when we run out of disk space or whatever
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// on the client side. Other times, it's the server that's got the useful
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// error message.
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if (_exception == null || e.ErrorDescription[0] == Failure.VDI_IN_USE)
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_exception = e;
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}
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catch (Exception e)
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{
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// Test for null: don't overwrite a previous exception
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if (_exception == null)
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_exception = e;
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}
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}
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}
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}
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