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using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core;
using Tango.Core.DI;
using Tango.FileSystem;
using Tango.FileSystem.Network;
using Tango.Integration.ExternalBridge;
using Tango.PPC.Common.ExternalBridge;
using Tango.Transport;
namespace Tango.PPC.Common.FileSystem
{
[TangoCreateWhenRegistered]
public class DefaultFileSystemService : ExtendedObject, IFileSystemService, IExternalBridgeRequestHandler
{
private enum FileSystemOperationMode
{
Upload,
Download
}
private class FileSystemOperation
{
public FileSystemOperationMode Mode { get; set; }
public String Id { get; set; }
public String Path { get; set; }
public FileSystemOperation(FileSystemOperationMode mode, String path)
{
Mode = mode;
Id = Guid.NewGuid().ToString();
Path = path;
}
}
private FileSystemManager _manager;
private Dictionary<String, FileSystemOperation> _operations;
public bool Enabled { get; set; } = true;
public DefaultFileSystemService(IPPCExternalBridgeService externalBridge)
{
_manager = new FileSystemManager();
_operations = new Dictionary<string, FileSystemOperation>();
externalBridge.RegisterRequestHandler(this);
}
[ExternalBridgeRequestHandlerMethod(typeof(GetFileSystemItemRequest))]
public async void OnGetFileSystemItemRequest(GetFileSystemItemRequest request, String token, ExternalBridgeReceiver receiver)
{
try
{
FileSystemItemDTO dto = _manager.GetFolder(request);
await receiver.SendGenericResponse(new GetFileSystemItemResponse() { FileSystemItem = dto }, token);
}
catch (Exception ex)
{
await receiver.SendErrorResponse(ex, token);
}
}
[ExternalBridgeRequestHandlerMethod(typeof(FileUploadRequest))]
public async void OnFileUploadRequest(FileUploadRequest request, String token, ExternalBridgeReceiver receiver)
{
try
{
using (var stream = new FileStream(request.Path, FileMode.Create)) { }
FileSystemOperation operation = new FileSystemOperation(FileSystemOperationMode.Upload, request.Path);
_operations.Add(operation.Id, operation);
await receiver.SendGenericResponse(new FileUploadResponse() { OperationId = operation.Id }, token);
}
catch (Exception ex)
{
await receiver.SendErrorResponse(ex, token);
}
}
[ExternalBridgeRequestHandlerMethod(typeof(FileDownloadRequest))]
public async void OnFileDownloadRequest(FileDownloadRequest request, String token, ExternalBridgeReceiver receiver)
{
try
{
if (!File.Exists(request.Path))
{
await receiver.SendErrorResponse(new FileNotFoundException("Could not find the specified file."), token);
return;
}
FileSystemOperation operation = new FileSystemOperation(FileSystemOperationMode.Download, request.Path);
_operations.Add(operation.Id, operation);
await receiver.SendGenericResponse(new FileDownloadResponse()
{
OperationId = operation.Id,
Length = new FileInfo(request.Path).Length
}, token);
}
catch (Exception ex)
{
await receiver.SendErrorResponse(ex, token);
}
}
[ExternalBridgeRequestHandlerMethod(typeof(ChunkUploadRequest))]
public async void OnChunkUploadRequest(ChunkUploadRequest request, String token, ExternalBridgeReceiver receiver)
{
try
{
FileSystemOperation operation;
_operations.TryGetValue(request.OperationId, out operation);
if (operation == null)
{
await receiver.SendErrorResponse(new ArgumentException("Invalid operation id."), token);
return;
}
using (var stream = new FileStream(operation.Path, FileMode.Append))
{
stream.Write(request.Data, 0, request.Data.Length);
}
await receiver.SendGenericResponse(new ChunkUploadResponse(), token);
}
catch (Exception ex)
{
await receiver.SendErrorResponse(ex, token);
}
}
[ExternalBridgeRequestHandlerMethod(typeof(ChunkDownloadRequest))]
public async void OnChunkDownloadRequest(ChunkDownloadRequest request, String token, ExternalBridgeReceiver receiver)
{
FileSystemOperation operation;
_operations.TryGetValue(request.OperationId, out operation);
if (operation == null)
{
await receiver.SendErrorResponse(new ArgumentException("Invalid operation id."), token);
return;
}
using (FileStream stream = new FileStream(operation.Path, FileMode.Open))
{
stream.Position = request.Position;
byte[] data = new byte[Math.Min(request.MaxChunkSize, stream.Length - stream.Position)];
await stream.ReadAsync(data, 0, data.Length);
await receiver.SendGenericResponse(new ChunkDownloadResponse()
{
Data = data
}, token);
}
}
[ExternalBridgeRequestHandlerMethod(typeof(AbortOperationRequest))]
public async void OnAbortOperationRequest(AbortOperationRequest request, String token, ExternalBridgeReceiver receiver)
{
FileSystemOperation operation;
_operations.TryGetValue(request.OperationId, out operation);
if (operation == null)
{
await receiver.SendErrorResponse(new ArgumentException("Invalid operation id."), token);
return;
}
try
{
if (operation.Mode == FileSystemOperationMode.Upload)
{
if (File.Exists(operation.Path))
{
File.Delete(operation.Path);
}
else if (Directory.Exists(operation.Path))
{
Directory.Delete(operation.Path, true);
}
}
await receiver.SendGenericResponse(new AbortOperationResponse(), token);
}
catch (Exception ex)
{
await receiver.SendErrorResponse(ex, token);
}
}
public void OnReceiverDisconnected(ExternalBridgeReceiver receiver)
{
}
}
}
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