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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
namespace Tango.Transport.Web
{
public class StandardFileDownloader : IWebFileDownloader
{
private WebClient _client;
private TaskCompletionSource<object> _completionSource;
public String Address { get; private set; }
public String FileName { get; private set; }
public event EventHandler<WebFileDownloaderProgressEventArgs> Progress;
public StandardFileDownloader(String address, String fileName)
{
Address = address;
FileName = fileName;
_client = new WebClient();
_client.Proxy = null;
_client.DownloadProgressChanged += _client_DownloadProgressChanged;
_client.DownloadFileCompleted += _client_DownloadFileCompleted;
_completionSource = new TaskCompletionSource<object>();
}
private void _client_DownloadFileCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
{
if (e.Error != null)
{
_completionSource.SetException(e.Error);
}
else
{
_completionSource.SetResult(true);
}
}
public Task Download()
{
_client.DownloadFileAsync(new Uri(Address), FileName);
return _completionSource.Task;
}
private void _client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
Progress?.Invoke(this, new WebFileDownloaderProgressEventArgs()
{
Current = e.BytesReceived,
Total = e.TotalBytesToReceive,
});
}
public Task<long> GetFileSize()
{
return Task.Factory.StartNew<long>(() =>
{
using (var client = new WebClient())
{
client.OpenRead(Address);
Int64 bytes_total = Convert.ToInt64(client.ResponseHeaders["Content-Length"]);
return bytes_total;
}
});
}
public void Dispose()
{
_client.Dispose();
}
}
}
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