/// <summary>
/// UPDATE
/// </summary>
///
private void UpdateItem(ItemMetadata item, ItemChange change, SaveChangeContext context)
{
var data = (IFileDataRetriever)context.ChangeData;
var attr = _metadataStore.GetItemInfo(item);
var stream = data.FileData.IsDirectory ? null : data.FileStream;
try
{
SyncedNodeAttributes updatedNode = null;
//if pathes are different then consider renaming with unchanged content
if (attr.Path != data.FileData.RelativePath)
{
updatedNode = _nodeStore.MoveFile(attr.Path, data.FileData.RelativePath, attr.Id);
OnAppliedChange(ChangeType.Rename, data.FileData.RelativePath, attr.Path);
}
else
{
updatedNode = _nodeStore.UpdateFile(attr.Path, data.FileData, stream, attr.Id);
OnAppliedChange(ChangeType.Update, data.FileData.RelativePath);
}
item.ChangeVersion = change.ChangeVersion;
_metadataStore.SaveItemMetadata(item, updatedNode.Id, updatedNode.Path);
}
catch (MegaStoreConstraintException e)
{
ProcessConstraint(change, context, e, item, e.Node);
}
catch (MegaStoreException e)
{
ForgetItem(context, item, e);
}
catch (MegaApiException e)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
OnDemandedResync();
}
catch (DirectoryNotFoundException e)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
OnDemandedResync();
}
catch (COMException e)
{
OnDemandedResync();
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
}
finally
{
CloseStream(stream);
}
}
private void ProcessConstraint(
ItemChange change,
SaveChangeContext context,
MegaStoreConstraintException e,
ItemMetadata item,
MegaNodeHelper conflictingNode)
{
switch (e.ConstraintType)
{
case MegaStoreConstraintType.TargetExists:
ResolveConflict(item, change, context, conflictingNode);
break;
case MegaStoreConstraintType.NoParent:
OnDemandedResync();
context.RecordConstraintConflictForItem(ConstraintConflictReason.NoParent);
break;
// todo add no-free-space handling
case MegaStoreConstraintType.ZeroSize:
context.RecordConstraintConflictForItem(ConstraintConflictReason.Other);
break;
case MegaStoreConstraintType.NotEmpty:
OnDemandedResync();
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
break;
}
}
private void DoNothing(
ItemMetadata item,
ItemChange change,
SaveChangeContext context,
bool deleted = false,
MegaNodeHelper existingNode = null)
{
// creating
if (item == null)
{
if (existingNode == null)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(new Exception()));
}
item = _metadataStore.Metadata.CreateItemMetadata(change.ItemId, change.CreationVersion);
item.ChangeVersion = change.ChangeVersion;
_metadataStore.SaveItemMetadata(item, existingNode.Node.Id, existingNode.Path);
return;
}
if (deleted)
{
item.MarkAsDeleted(change.ChangeVersion);
}
item.ChangeVersion = change.ChangeVersion;
_metadataStore.SaveItemMetadata(item);
}
// the node is suddenly out, remove it from database
// (it was a concurrency delete attempt - we should restore the existing version)
private void ForgetItem(SaveChangeContext context, ItemMetadata item, Exception e)
{
_metadataStore.Metadata.RemoveItemMetadata(new List <SyncId> {
item.GlobalId
});
OnDemandedResync();
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
}
/// <summary>
/// CREATE
/// </summary>
private void CreateItem(ItemChange change, SaveChangeContext context, ItemMetadata itemToSaveChanges = null)
{
var data = (IFileDataRetriever)context.ChangeData;
Stream stream = null;
try
{
stream = data.FileData.IsDirectory ? null : data.FileStream;
var createdNode = _nodeStore.InsertNode(data.FileData, data.FileData.RelativePath, stream);
if (itemToSaveChanges == null)
{
itemToSaveChanges = _metadataStore.CreateItemMetadata(change.ItemId, change.CreationVersion);
}
itemToSaveChanges.ChangeVersion = change.ChangeVersion;
_metadataStore.SaveItemMetadata(itemToSaveChanges, createdNode.Id, createdNode.Path);
OnAppliedChange(ChangeType.Create, data.FileData.RelativePath);
}
catch (MegaStoreConstraintException e)
{
ProcessConstraint(change, context, e, null, e.Node);
}
catch (MegaApiException e)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
}
catch (DirectoryNotFoundException e)
{
OnDemandedResync();
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
}
catch (COMException e)
{
OnDemandedResync();
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
}
finally
{
CloseStream(stream);
}
}
/// <summary>
/// DELETE
/// </summary>
private void DeleteItem(ItemMetadata item, ItemChange change, SaveChangeContext context, bool removeTombstone = false)
{
try
{
var attr = _metadataStore.GetItemInfo(item);
_nodeStore.DeleteFile(attr.Path, attr.Id);
OnAppliedChange(ChangeType.Delete, null, attr.Path);
if (removeTombstone)
{
_metadataStore.Metadata.RemoveItemMetadata(new List <SyncId> {
item.GlobalId
});
}
else
{
item.MarkAsDeleted(change.ChangeVersion);
_metadataStore.SaveItemMetadata(item);
}
}
catch (MegaStoreConstraintException e)
{
ProcessConstraint(change, context, e, item, null);
}
// never mind, the item isn't found anyway
catch (MegaStoreException)
{
if (removeTombstone)
{
_metadataStore.Metadata.RemoveItemMetadata(new List <SyncId> {
item.GlobalId
});
}
else
{
item.MarkAsDeleted(change.ChangeVersion);
_metadataStore.SaveItemMetadata(item);
}
}
catch (MegaApiException e)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
OnDemandedResync();
}
}
public void SaveItemChange(SaveChangeAction saveChangeAction, ItemChange change, SaveChangeContext context)
{
ItemMetadata item = null;
T data = default(T);
try
{
switch (saveChangeAction)
{
case SaveChangeAction.Create:
try
{
//Do duplicate detection here
item = _metaData.FindItemMetadataById(change.ItemId);
if (item != null)
{
throw new SyncProviderException("SaveItemChange must not have Create action for existing items.");
}
item = _metaData.CreateItemMetadata(change.ItemId, change.CreationVersion);
item.ChangeVersion = change.ChangeVersion;
data = ConvertFromTransferData(context.ChangeData);
CreateDataItem(change, item, data);
SaveItemMetadata(item);
}
catch (Exception e)
{
throw new SyncProviderException(e, SaveChangeAction.Create);
}
break;
case SaveChangeAction.UpdateVersionAndData:
case SaveChangeAction.UpdateVersionOnly:
try
{
item = _metaData.FindItemMetadataById(change.ItemId);
if (null == item)
{
throw new SyncProviderException("Item Not Found in Store!?");
}
item.ChangeVersion = change.ChangeVersion;
if (saveChangeAction == SaveChangeAction.UpdateVersionOnly)
{
SaveItemMetadata(item);
}
else //Also update the data.
{
data = ConvertFromTransferData(context.ChangeData);
UpdateDataItem(change, item, data);
SaveItemMetadata(item);
}
}
catch (Exception e)
{
throw new SyncProviderException(e, SaveChangeAction.UpdateVersionAndData);
}
break;
case SaveChangeAction.DeleteAndStoreTombstone:
try
{
item = _metaData.FindItemMetadataById(change.ItemId);
if (null == item)
{
item = _metaData.CreateItemMetadata(change.ItemId, change.CreationVersion);
}
if (change.ChangeKind == ChangeKind.Deleted)
{
item.MarkAsDeleted(change.ChangeVersion);
}
else
{
// This should never happen in Sync Framework V1.0
throw new SyncProviderException("Invalid ChangeType");
}
item.ChangeVersion = change.ChangeVersion;
SaveItemMetadata(item);
DeleteDataItem(change, item, data); //item.GlobalId.GetGuidId());
}
catch (Exception e)
{
throw new SyncProviderException(e, SaveChangeAction.DeleteAndStoreTombstone);
}
break;
//Merge the changes! (Take the data from the local item + the remote item),noting to update the tick count to propagate the resolution!
case SaveChangeAction.UpdateVersionAndMergeData:
try
{
item = _metaData.FindItemMetadataById(change.ItemId);
if (null == item)
{
throw new SyncProviderException("Item Not Found in Store!?");
}
if (item.IsDeleted != true)
{
//Note - you must update the change version to propagate the resolution!
item.ChangeVersion = new SyncVersion(0, _metaData.GetNextTickCount());
//Combine the conflicting data...
T dataItem = GetDataItem(item);
if (dataItem == null)
{
throw new SyncProviderException("data item not found for merge");
}
data = ConvertFromTransferData(context.ChangeData);
data = MergeDataItem(dataItem, data);
UpdateDataItem(change, item, data);
SaveItemMetadata(item);
}
}
catch (Exception e)
{
throw new SyncProviderException(e, SaveChangeAction.UpdateVersionAndMergeData);
}
break;
case SaveChangeAction.DeleteAndRemoveTombstone:
try
{
item = _metaData.FindItemMetadataById(change.ItemId);
if (item != null)
{
_metaData.RemoveItemMetadata(new SyncId[] { item.GlobalId });
}
data = ConvertFromTransferData(context.ChangeData);
DeleteDataItem(change, item, data);
}
catch (Exception e)
{
throw new SyncProviderException(e, SaveChangeAction.DeleteAndRemoveTombstone);
}
break;
}
}
catch (SyncProviderException e)
{
Exception exception = e.InnerException != null ? e.InnerException : e;
string itemDescr = e.SaveChangeAction.ToString();
string errDescr = e.Message + "[" + e.InnerException != null?e.InnerException.ToString()
: string.Empty + "]";
RecoverableErrorData recoverableError = new RecoverableErrorData(exception, itemDescr, errDescr);
context.RecordRecoverableErrorForItem(recoverableError);
}
}
// the node is suddenly out, remove it from database
// (it was a concurrency delete attempt - we should restore the existing version)
private void ForgetItem(SaveChangeContext context, ItemMetadata item, Exception e)
{
_metadataStore.Metadata.RemoveItemMetadata(new List<SyncId> { item.GlobalId });
OnDemandedResync();
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
}
private void ProcessConstraint(
ItemChange change,
SaveChangeContext context,
MegaStoreConstraintException e,
ItemMetadata item,
MegaNodeHelper conflictingNode)
{
switch (e.ConstraintType)
{
case MegaStoreConstraintType.TargetExists:
ResolveConflict(item, change, context, conflictingNode);
break;
case MegaStoreConstraintType.NoParent:
OnDemandedResync();
context.RecordConstraintConflictForItem(ConstraintConflictReason.NoParent);
break;
// todo add no-free-space handling
case MegaStoreConstraintType.ZeroSize:
context.RecordConstraintConflictForItem(ConstraintConflictReason.Other);
break;
case MegaStoreConstraintType.NotEmpty:
OnDemandedResync();
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
break;
}
}
private void DoNothing(
ItemMetadata item,
ItemChange change,
SaveChangeContext context,
bool deleted = false,
MegaNodeHelper existingNode = null)
{
// creating
if (item == null)
{
if (existingNode == null)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(new Exception()));
}
item = _metadataStore.Metadata.CreateItemMetadata(change.ItemId, change.CreationVersion);
item.ChangeVersion = change.ChangeVersion;
_metadataStore.SaveItemMetadata(item, existingNode.Node.Id, existingNode.Path);
return;
}
if (deleted)
{
item.MarkAsDeleted(change.ChangeVersion);
}
item.ChangeVersion = change.ChangeVersion;
_metadataStore.SaveItemMetadata(item);
}
/// <summary>
/// CONFLICT
/// </summary>
private void ResolveConflict(ItemMetadata item, ItemChange change, SaveChangeContext context, MegaNodeHelper conflictingNode)
{
var data = (IFileDataRetriever)context.ChangeData;
// item does not exist in metadata (can happen when create+create)
if (item == null)
{
if (conflictingNode == null)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(new Exception()));
}
if (FilesAreEqual(data, conflictingNode))
{
DoNothing(item, change, context, false, conflictingNode);
}
else
{
BackupFile(item, conflictingNode.Path, change, context);
}
return;
}
var attr = _metadataStore.GetItemInfo(item);
try
{
if (change.ChangeKind == ChangeKind.Deleted)
{
// local delete + remote delete
if (item.IsDeleted)
{
DoNothing(item, change, context, true);
}
// local delete + remote update
else
{
DownloadBack(item, change);
}
}
else
{
// local update + remote delete
if (item.IsDeleted)
{
UploadBack(item, change, context);
}
// update + update
else
{
if (FilesAreEqual(data, _nodeStore.FindNodeById(attr.Id)))
{
DoNothing(item, change, context);
}
else
{
BackupFile(item, attr.Path, change, context);
}
}
}
}
catch (MegaApiException e)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
}
}
/// <summary>
/// DELETE
/// </summary>
private void DeleteItem(ItemMetadata item, ItemChange change, SaveChangeContext context, bool removeTombstone = false)
{
try
{
var attr = _metadataStore.GetItemInfo(item);
_nodeStore.DeleteFile(attr.Path, attr.Id);
OnAppliedChange(ChangeType.Delete, null, attr.Path);
if (removeTombstone)
{
_metadataStore.Metadata.RemoveItemMetadata(new List<SyncId> { item.GlobalId });
}
else
{
item.MarkAsDeleted(change.ChangeVersion);
_metadataStore.SaveItemMetadata(item);
}
}
catch (MegaStoreConstraintException e)
{
ProcessConstraint(change, context, e, item, null);
}
// never mind, the item isn't found anyway
catch (MegaStoreException)
{
if (removeTombstone)
{
_metadataStore.Metadata.RemoveItemMetadata(new List<SyncId> { item.GlobalId });
}
else
{
item.MarkAsDeleted(change.ChangeVersion);
_metadataStore.SaveItemMetadata(item);
}
}
catch (MegaApiException e)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
OnDemandedResync();
}
}
/// <summary>
/// UPDATE
/// </summary>
///
private void UpdateItem(ItemMetadata item, ItemChange change, SaveChangeContext context)
{
var data = (IFileDataRetriever)context.ChangeData;
var attr = _metadataStore.GetItemInfo(item);
var stream = data.FileData.IsDirectory ? null : data.FileStream;
try
{
SyncedNodeAttributes updatedNode = null;
//if pathes are different then consider renaming with unchanged content
if (attr.Path != data.FileData.RelativePath)
{
updatedNode = _nodeStore.MoveFile(attr.Path, data.FileData.RelativePath, attr.Id);
OnAppliedChange(ChangeType.Rename, data.FileData.RelativePath, attr.Path);
}
else
{
updatedNode = _nodeStore.UpdateFile(attr.Path, data.FileData, stream, attr.Id);
OnAppliedChange(ChangeType.Update, data.FileData.RelativePath);
}
item.ChangeVersion = change.ChangeVersion;
_metadataStore.SaveItemMetadata(item, updatedNode.Id, updatedNode.Path);
}
catch (MegaStoreConstraintException e)
{
ProcessConstraint(change, context, e, item, e.Node);
}
catch (MegaStoreException e)
{
ForgetItem(context, item, e);
}
catch (MegaApiException e)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
OnDemandedResync();
}
catch (DirectoryNotFoundException e)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
OnDemandedResync();
}
catch (COMException e)
{
OnDemandedResync();
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
}
finally
{
CloseStream(stream);
}
}
/// <summary>
/// CREATE
/// </summary>
private void CreateItem(ItemChange change, SaveChangeContext context, ItemMetadata itemToSaveChanges = null)
{
var data = (IFileDataRetriever)context.ChangeData;
Stream stream = null;
try
{
stream = data.FileData.IsDirectory ? null : data.FileStream;
var createdNode = _nodeStore.InsertNode(data.FileData, data.FileData.RelativePath, stream);
if (itemToSaveChanges == null)
{
itemToSaveChanges = _metadataStore.CreateItemMetadata(change.ItemId, change.CreationVersion);
}
itemToSaveChanges.ChangeVersion = change.ChangeVersion;
_metadataStore.SaveItemMetadata(itemToSaveChanges, createdNode.Id, createdNode.Path);
OnAppliedChange(ChangeType.Create, data.FileData.RelativePath);
}
catch (MegaStoreConstraintException e)
{
ProcessConstraint(change, context, e, null, e.Node);
}
catch (MegaApiException e)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
}
catch (DirectoryNotFoundException e)
{
OnDemandedResync();
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
}
catch (COMException e)
{
OnDemandedResync();
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
}
finally
{
CloseStream(stream);
}
}
/// <summary>
/// CONFLICT
/// </summary>
private void ResolveConflict(ItemMetadata item, ItemChange change, SaveChangeContext context, MegaNodeHelper conflictingNode)
{
var data = (IFileDataRetriever)context.ChangeData;
// item does not exist in metadata (can happen when create+create)
if (item == null)
{
if (conflictingNode == null)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(new Exception()));
}
if (FilesAreEqual(data, conflictingNode))
{
DoNothing(item, change, context, false, conflictingNode);
}
else
{
BackupFile(item, conflictingNode.Path, change, context);
}
return;
}
var attr = _metadataStore.GetItemInfo(item);
try
{
if (change.ChangeKind == ChangeKind.Deleted)
{
// local delete + remote delete
if (item.IsDeleted)
{
DoNothing(item, change, context, true);
}
// local delete + remote update
else
{
DownloadBack(item, change);
}
}
else
{
// local update + remote delete
if (item.IsDeleted)
{
UploadBack(item, change, context);
}
// update + update
else
{
if (FilesAreEqual(data, _nodeStore.FindNodeById(attr.Id)))
{
DoNothing(item, change, context);
}
else
{
BackupFile(item, attr.Path, change, context);
}
}
}
}
catch (MegaApiException e)
{
context.RecordRecoverableErrorForItem(new RecoverableErrorData(e));
}
}