/// <summary>
/// Gets list of files and folders in this folder in the remote storage.
/// </summary>
/// <param name="pattern">Search pattern.</param>
/// <returns>
/// List of files and folders located in this folder in the remote
/// storage that correstonds with the provided search pattern.
/// </returns>
public async Task <IEnumerable <FileSystemItemBasicInfo> > EnumerateChildrenAsync(string pattern)
{
// This method has a 60 sec timeout.
// To process longer requests modify the IFolder.GetChildrenAsync() implementation.
IHierarchyItemAsync[] remoteStorageChildren = null;
// Retry the request in case the log-in dialog is shown.
try
{
remoteStorageChildren = await Program.DavClient.GetChildrenAsync(new Uri(RemoteStorageUri), false);
}
catch (ITHit.WebDAV.Client.Exceptions.Redirect302Exception)
{
remoteStorageChildren = await Program.DavClient.GetChildrenAsync(new Uri(RemoteStorageUri), false);
}
List <FileSystemItemBasicInfo> userFileSystemChildren = new List <FileSystemItemBasicInfo>();
foreach (IHierarchyItemAsync remoteStorageItem in remoteStorageChildren)
{
FileSystemItemBasicInfo itemInfo = Mapping.GetUserFileSystemItemBasicInfo(remoteStorageItem);
userFileSystemChildren.Add(itemInfo);
}
return(userFileSystemChildren);
}
/// <summary>
/// Called when a file or folder is created in the remote storage.
/// </summary>
/// <remarks>In this method we create a new file/folder in user file system.</remarks>
private async void CreatedAsync(object sender, FileSystemEventArgs e)
{
LogMessage(e.ChangeType.ToString(), e.FullPath);
string remoteStoragePath = e.FullPath;
try
{
// We do not want to sync MS Office temp files from remote storage.
if (!FsPath.AvoidSync(remoteStoragePath))
{
string userFileSystemPath = Mapping.ReverseMapPath(remoteStoragePath);
string userFileSystemParentPath = Path.GetDirectoryName(userFileSystemPath);
// Because of the on-demand population the file or folder placeholder may not exist in the user file system
// or the folder may be offline.
if (Directory.Exists(userFileSystemParentPath) &&
!new DirectoryInfo(userFileSystemParentPath).Attributes.HasFlag(System.IO.FileAttributes.Offline))
{
FileSystemInfo remoteStorageItem = FsPath.GetFileSystemItem(remoteStoragePath);
FileSystemItemBasicInfo newItemInfo = Mapping.GetUserFileSysteItemBasicInfo(remoteStorageItem);
await UserFileSystemRawItem.CreateAsync(userFileSystemParentPath, new[] { newItemInfo });
LogMessage($"Created succesefully", userFileSystemPath);
}
}
}
catch (Exception ex)
{
LogError($"{e.ChangeType} failed", remoteStoragePath, null, ex);
}
}
//$>
//$<PlaceholderItem.SetItemInfo
/// <summary>
/// Updates information about the file or folder placeholder in the user file system.
/// This method automatically hydrates and dehydrate files.
/// </summary>
/// <remarks>This method failes if the file or folder in user file system is modified (not in-sync with the remote storage).</remarks>
/// <param name="itemInfo">New file or folder info.</param>
/// <returns>True if the file was updated. False - otherwise.</returns>
public async Task <bool> UpdateAsync(FileSystemItemBasicInfo itemInfo)
{
try
{
// Because of the on-demand population the file or folder placeholder may not exist in the user file system.
if (FsPath.Exists(userFileSystemPath))
{
PlaceholderItem placeholderItem = PlaceholderItem.GetItem(userFileSystemPath);
// To be able to update the item we need to remove the read-only attribute.
if ((FsPath.GetFileSystemItem(userFileSystemPath).Attributes | System.IO.FileAttributes.ReadOnly) != 0)
{
FsPath.GetFileSystemItem(userFileSystemPath).Attributes &= ~System.IO.FileAttributes.ReadOnly;
}
// Dehydrate/hydrate the file, update file size, custom data, creation date, modification date, attributes.
placeholderItem.SetItemInfo(itemInfo);
// Set ETag.
await ETag.SetETagAsync(userFileSystemPath, itemInfo.ETag);
// Clear icon.
//await ClearStateAsync();
// Set the "locked by another user" icon and all custom columns data.
await SetLockedByAnotherUserAsync(itemInfo.LockedByAnotherUser);
await SetCustomColumnsDataAsync(itemInfo.CustomProperties);
return(true);
}
}
catch (Exception ex)
{
await SetDownloadErrorStateAsync(ex);
// Rethrow the exception preserving stack trace of the original exception.
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Capture(ex).Throw();
}
return(false);
}
/// <summary>
/// Updates information about the file or folder placeholder in the user file system.
/// This method automatically hydrates and dehydrate files.
/// </summary>
/// <remarks>This method failes if the file or folder in user file system is modified (not in-sync with the remote storage).</remarks>
/// <param name="remoteStorageItem">Remote storage item info. The placeholder info will be updated with info provided in this item.</param>
internal async Task UpdateAsync(FileSystemInfo remoteStorageItem)
{
/*
* // Process conflicts. File <-> Folder. Folder <-> File.
* if (File.Exists(userFileSystemPath) && (remoteStorageItem is DirectoryInfo))
* {
* }
* else if (Directory.Exists(userFileSystemPath) && (remoteStorageItem is FileInfo))
* {
* }
*/
FileSystemItemBasicInfo userFileSystemItemInfo = Mapping.GetUserFileSysteItemInfo(remoteStorageItem);
try
{
// Dehydrate/hydrate the file, update file size and info.
PlaceholderItem.GetItem(userFileSystemPath).SetItemInfo(userFileSystemItemInfo);
// Clear download pending icon
await SetDownloadPendingIconAsync(false);
}
catch (System.ComponentModel.Win32Exception ex)
{
if (ex.NativeErrorCode == 802)
{
// The file is blocked by the client application or pinned.
// "The operation did not complete successfully because it would cause an oplock to be broken.
// The caller has requested that existing oplocks not be broken."
// Show download pending icon.
await SetDownloadPendingIconAsync(true);
}
// Rethrow the exception preserving stack trace of the original exception.
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Capture(ex).Throw();
}
}
/// <summary>
/// Called when a file content changed or file/folder attributes changed in the remote storage.
/// </summary>
/// <remarks>
/// In this method we update corresponding file/folder information in user file system.
/// We also dehydrate the file if it is not blocked.
/// </remarks>
private async void ChangedAsync(object sender, FileSystemEventArgs e)
{
LogMessage(e.ChangeType.ToString(), e.FullPath);
string remoteStoragePath = e.FullPath;
try
{
// We do not want to sync MS Office temp files, etc. from remote storage.
if (!FsPath.AvoidSync(remoteStoragePath))
{
string userFileSystemPath = Mapping.ReverseMapPath(remoteStoragePath);
// Because of the on-demand population the file or folder placeholder may not exist in the user file system.
if (FsPath.Exists(userFileSystemPath))
{
FileSystemInfo remoteStorageItem = FsPath.GetFileSystemItem(remoteStoragePath);
// This check is only required because we can not prevent circular calls because of the simplicity of this example.
// In your real-life application you will not sent updates from server back to client that issued the update.
FileSystemItemBasicInfo itemInfo = Mapping.GetUserFileSysteItemBasicInfo(remoteStorageItem);
if (!await ETag.ETagEqualsAsync(userFileSystemPath, itemInfo))
{
await new UserFileSystemRawItem(userFileSystemPath).UpdateAsync(itemInfo);
LogMessage("Updated succesefully", userFileSystemPath);
}
// Update "locked by another user" icon.
await new UserFileSystemRawItem(userFileSystemPath).SetLockedByAnotherUserAsync(itemInfo.LockedByAnotherUser);
}
}
}
catch (Exception ex)
{
LogError($"{e.ChangeType} failed", remoteStoragePath, null, ex);
}
}
/// <summary>
/// Recursively synchronizes all files and folders from server to client.
/// Synchronizes only folders already loaded into the user file system.
/// </summary>
/// <param name="userFileSystemFolderPath">Folder path in user file system.</param>
internal async Task SyncronizeFolderAsync(string userFileSystemFolderPath)
{
// In case of on-demand loading the user file system contains only a subset of the server files and folders.
// Here we sync folder only if its content already loaded into user file system (folder is not offline).
// The folder content is loaded inside IFolder.GetChildrenAsync() method.
if (new DirectoryInfo(userFileSystemFolderPath).Attributes.HasFlag(System.IO.FileAttributes.Offline))
{
// LogMessage("Folder offline, skipping:", userFileSystemFolderPath);
return;
}
IEnumerable <string> userFileSystemChildren = Directory.EnumerateFileSystemEntries(userFileSystemFolderPath, "*");
//LogMessage("Synchronizing:", userFileSystemFolderPath);
IEnumerable <FileSystemItemBasicInfo> remoteStorageChildrenItems = await new UserFolder(userFileSystemFolderPath).EnumerateChildrenAsync("*");
// Create new files/folders in the user file system.
string remoteStorageFolderPath = Mapping.MapPath(userFileSystemFolderPath);
foreach (FileSystemItemBasicInfo remoteStorageItem in remoteStorageChildrenItems)
{
string userFileSystemPath = Path.Combine(userFileSystemFolderPath, remoteStorageItem.Name);
try
{
// We do not want to sync MS Office temp files, etc. from remote storage.
// We also do not want to create MS Office files during transactional save in user file system.
string remoteStorageItemFullPath = Path.Combine(remoteStorageFolderPath, remoteStorageItem.Name);
if (!FsPath.AvoidSync(remoteStorageItemFullPath) && !FsPath.AvoidSync(userFileSystemPath))
{
if (!FsPath.Exists(userFileSystemPath))
{
LogMessage($"Creating", userFileSystemPath);
await UserFileSystemRawItem.CreateAsync(userFileSystemFolderPath, new[] { remoteStorageItem });
LogMessage($"Created succesefully", userFileSystemPath);
}
}
}
catch (Exception ex)
{
LogError("Creation failed", userFileSystemPath, null, ex);
}
}
// Update files/folders in user file system and sync subfolders.
userFileSystemChildren = Directory.EnumerateFileSystemEntries(userFileSystemFolderPath, "*");
foreach (string userFileSystemPath in userFileSystemChildren)
{
try
{
string itemName = Path.GetFileName(userFileSystemPath);
string remoteStoragePath = Mapping.MapPath(userFileSystemPath);
FileSystemItemBasicInfo remoteStorageItem = remoteStorageChildrenItems.FirstOrDefault(x => x.Name.Equals(itemName, StringComparison.InvariantCultureIgnoreCase));
if (!FsPath.AvoidSync(userFileSystemPath) && !FsPath.AvoidSync(remoteStoragePath))
{
if (remoteStorageItem == null)
{
if (PlaceholderItem.GetItem(userFileSystemPath).GetInSync())
{
// Delete the file/folder in user file system.
LogMessage("Deleting item", userFileSystemPath);
await new UserFileSystemRawItem(userFileSystemPath).DeleteAsync();
LogMessage("Deleted succesefully", userFileSystemPath);
}
}
else
{
if (PlaceholderItem.GetItem(userFileSystemPath).GetInSync() &&
!await ETag.ETagEqualsAsync(userFileSystemPath, remoteStorageItem))
{
// User file system <- remote storage update.
LogMessage("Item modified", remoteStoragePath);
await new UserFileSystemRawItem(userFileSystemPath).UpdateAsync(remoteStorageItem);
LogMessage("Updated succesefully", userFileSystemPath);
}
// Update "locked by another user" icon.
if (PlaceholderItem.GetItem(userFileSystemPath).GetInSync())
{
await new UserFileSystemRawItem(userFileSystemPath).SetLockedByAnotherUserAsync(remoteStorageItem.LockedByAnotherUser);
}
// Hydrate / dehydrate the file.
if (new UserFileSystemRawItem(userFileSystemPath).HydrationRequired())
{
LogMessage("Hydrating", userFileSystemPath);
new PlaceholderFile(userFileSystemPath).Hydrate(0, -1);
LogMessage("Hydrated succesefully", userFileSystemPath);
}
else if (new UserFileSystemRawItem(userFileSystemPath).DehydrationRequired())
{
LogMessage("Dehydrating", userFileSystemPath);
new PlaceholderFile(userFileSystemPath).Dehydrate(0, -1);
LogMessage("Dehydrated succesefully", userFileSystemPath);
}
}
}
}
catch (Exception ex)
{
LogError("Update failed", userFileSystemPath, null, ex);
}
// Synchronize subfolders.
try
{
if (Directory.Exists(userFileSystemPath))
{
await SyncronizeFolderAsync(userFileSystemPath);
}
}
catch (Exception ex)
{
LogError("Folder sync failed:", userFileSystemPath, null, ex);
}
}
}