/// <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);
}
}
}