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using Microsoft.WindowsAzure.Storage.Blob;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core.IO;
namespace Tango.Transport.Web
{
public class StorageBlobDownloader : IWebFileDownloader
{
private bool _disposed;
private FileStreamWrapper _stream;
private long _fileSize;
private String _fileName;
public CloudBlockBlob Blob { get; private set; }
public String Address { get; private set; }
public event EventHandler<WebFileDownloaderProgressEventArgs> Progress;
public StorageBlobDownloader(CloudBlockBlob blob, String fileName)
{
Blob = blob;
_fileName = fileName;
}
public StorageBlobDownloader(String blobAddress, String fileName) : this(new CloudBlockBlob(new Uri(blobAddress)), fileName)
{
Address = blobAddress;
}
private void OnProgress(long current)
{
Progress?.Invoke(this, new WebFileDownloaderProgressEventArgs()
{
Current = current,
Total = _fileSize,
});
}
public async Task Download()
{
if (_disposed)
{
throw new ObjectDisposedException("The storage blob downloader can only be used once.");
}
await Blob.FetchAttributesAsync();
_fileSize = Blob.Properties.Length;
_stream = new FileStreamWrapper(_fileName, FileMode.Create, OnProgress);
await Blob.DownloadToStreamAsync(_stream);
Dispose();
}
public void Dispose()
{
if (!_disposed)
{
_disposed = true;
if (_stream != null)
{
_stream.Dispose();
}
}
}
public async Task<long> GetFileSize()
{
await Blob.FetchAttributesAsync();
return Blob.Properties.Length;
}
}
}
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