/// <summary>
/// Downloads a resource from specified url to a destination file
/// </summary>
/// <param name="url">Url to download</param>
/// <param name="fileName">Destination file path</param>
/// <param name="attempts">Number of times to attempt the download</param>
/// <param name="cancellationToken">Cancellation token</param>
private async Task DownloadToFileAsync(string url, string fileName, int attempts, CancellationToken cancellationToken)
{
if (attempts < 1)
{
throw new ArgumentException("Must attempt at least one time", nameof(attempts));
}
for (int i = 0; i < attempts; i++)
{
try
{
using (Stream libraryStream = await _requestHandler.GetStreamAsync(url, cancellationToken).ConfigureAwait(false))
{
await FileHelpers.SafeWriteToFileAsync(fileName, libraryStream, cancellationToken).ConfigureAwait(false);
break;
}
}
catch (ResourceDownloadException)
{
// rethrow last exception
if (i == attempts - 1)
{
throw;
}
}
await Task.Delay(200).ConfigureAwait(false);
}
}
/// <summary>
/// Downloads a resource from specified url to a destination file
/// </summary>
/// <param name="url"></param>
/// <param name="fileName"></param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
private async Task DownloadToFileAsync(string url, string fileName, CancellationToken cancellationToken)
{
using (Stream libraryStream = await _requestHandler.GetStreamAsync(url, cancellationToken))
{
await FileHelpers.SafeWriteToFileAsync(fileName, libraryStream, cancellationToken);
}
}
/// <summary>
/// Gets JSON via a get request to the provided URL and converts it to a JObject
/// </summary>
/// <param name="webRequestHandler"></param>
/// <param name="url"></param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
public static async Task <JObject> GetJsonObjectViaGetAsync(this IWebRequestHandler webRequestHandler, string url, CancellationToken cancellationToken)
{
JObject result = null;
using (Stream stream = await webRequestHandler.GetStreamAsync(url, cancellationToken))
{
using (StreamReader reader = new StreamReader(stream))
{
string jsonText = await reader.ReadToEndAsync();
result = await Task.Factory.StartNew(() => ((JObject)JsonConvert.DeserializeObject(jsonText)),
cancellationToken,
TaskCreationOptions.None,
TaskScheduler.Default);
}
}
return(result);
}
