protected virtual async Task <byte[]> DownloadAsync(string url, CancellationToken token, HttpClient client, Action <DownloadProgress> progressAction, TaskParameter parameters)
{
using (var cancelHeadersToken = new CancellationTokenSource())
{
cancelHeadersToken.CancelAfter(TimeSpan.FromSeconds(Configuration.HttpHeadersTimeout));
using (var linkedHeadersToken = CancellationTokenSource.CreateLinkedTokenSource(token, cancelHeadersToken.Token))
{
try
{
using (var response = await client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead, linkedHeadersToken.Token).ConfigureAwait(false))
{
if (!response.IsSuccessStatusCode)
{
throw new HttpRequestException(response.StatusCode.ToString());
}
if (response.Content == null)
{
throw new HttpRequestException("No Content");
}
var mediaType = response.Content.Headers?.ContentType?.MediaType;
if (!string.IsNullOrWhiteSpace(mediaType) && !mediaType.StartsWith("image/", StringComparison.OrdinalIgnoreCase))
{
if (InvalidContentTypes.Any(v => mediaType.StartsWith(v, StringComparison.OrdinalIgnoreCase)))
{
throw new HttpRequestException($"Invalid response content type ({mediaType})");
}
}
ModifyParametersAfterResponse(response, parameters);
using (var cancelReadTimeoutToken = new CancellationTokenSource())
{
var readTimeoutToken = cancelReadTimeoutToken.Token;
cancelReadTimeoutToken.CancelAfter(TimeSpan.FromSeconds(Configuration.HttpReadTimeout));
int total = (int)(response.Content.Headers.ContentLength ?? -1);
var canReportProgress = progressAction != null;
try
{
using (var outputStream = new MemoryStream())
using (var sourceStream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
{
int totalRead = 0;
var buffer = new byte[Configuration.HttpReadBufferSize];
int read = 0;
while ((read = await sourceStream.ReadAsync(buffer, 0, buffer.Length)) > 0)
{
token.ThrowIfCancellationRequested();
readTimeoutToken.ThrowIfCancellationRequested();
outputStream.Write(buffer, 0, read);
totalRead += read;
if (canReportProgress)
{
progressAction(new DownloadProgress()
{
Total = total, Current = totalRead
});
}
}
return(outputStream.ToArray());
}
}
catch (OperationCanceledException)
{
if (cancelReadTimeoutToken.IsCancellationRequested)
{
throw new Exception("HttpReadTimeout");
}
else
{
throw;
}
}
}
}
}
catch (OperationCanceledException)
{
if (cancelHeadersToken.IsCancellationRequested)
{
throw new Exception("HttpHeadersTimeout");
}
else
{
throw;
}
}
}
}
}
protected virtual async Task <byte[]> DownloadAsync(string url, CancellationToken token, HttpClient client, TaskParameter parameters, DownloadInformation downloadInformation)
{
if (!parameters.Preload)
{
await Task.Delay(25).ConfigureAwait(false);
token.ThrowIfCancellationRequested();
}
var progressAction = parameters.OnDownloadProgress;
using (var httpHeadersTimeoutTokenSource = new CancellationTokenSource())
using (var headersTimeoutTokenSource = CancellationTokenSource.CreateLinkedTokenSource(token, httpHeadersTimeoutTokenSource.Token))
{
httpHeadersTimeoutTokenSource.CancelAfter(TimeSpan.FromSeconds(Configuration.HttpHeadersTimeout));
try
{
var headerTimeoutToken = headersTimeoutTokenSource.Token;
using (var response = await client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead, headerTimeoutToken).ConfigureAwait(false))
{
headerTimeoutToken.ThrowIfCancellationRequested();
if (!response.IsSuccessStatusCode)
{
if (response.Content == null)
{
throw new DownloadHttpStatusCodeException(response.StatusCode);
}
using (response.Content)
{
var content = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
throw new DownloadHttpStatusCodeException(response.StatusCode, content);
}
}
if (response.Content == null)
{
throw new DownloadException("No content");
}
var mediaType = response.Content.Headers?.ContentType?.MediaType;
if (!string.IsNullOrWhiteSpace(mediaType) && !mediaType.StartsWith("image/", StringComparison.OrdinalIgnoreCase))
{
if (InvalidContentTypes.Any(v => mediaType.StartsWith(v, StringComparison.OrdinalIgnoreCase)))
{
throw new DownloadException($"Invalid response content type ({mediaType})");
}
}
if (!parameters.CacheDuration.HasValue && Configuration.TryToReadDiskCacheDurationFromHttpHeaders &&
response.Headers?.CacheControl?.MaxAge != null && response.Headers.CacheControl.MaxAge > TimeSpan.Zero)
{
downloadInformation.CacheValidity = response.Headers.CacheControl.MaxAge.Value;
}
ModifyParametersAfterResponse(response, parameters);
using (var httpReadTimeoutTokenSource = new CancellationTokenSource())
using (var readTimeoutTokenSource = CancellationTokenSource.CreateLinkedTokenSource(token, httpReadTimeoutTokenSource.Token))
{
var readTimeoutToken = readTimeoutTokenSource.Token;
var httpReadTimeoutToken = httpReadTimeoutTokenSource.Token;
var total = (int)(response.Content.Headers.ContentLength ?? -1);
var canReportProgress = progressAction != null;
httpReadTimeoutTokenSource.CancelAfter(TimeSpan.FromSeconds(Configuration.HttpReadTimeout));
readTimeoutToken.ThrowIfCancellationRequested();
try
{
using (var outputStream = new MemoryStream())
using (var sourceStream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
{
httpReadTimeoutToken.Register(() => sourceStream.TryDispose());
var totalRead = 0;
var buffer = new byte[Configuration.HttpReadBufferSize];
var read = 0;
while ((read = await sourceStream.ReadAsync(buffer, 0, buffer.Length).ConfigureAwait(false)) > 0)
{
readTimeoutToken.ThrowIfCancellationRequested();
outputStream.Write(buffer, 0, read);
totalRead += read;
if (canReportProgress)
{
progressAction(new DownloadProgress(totalRead, total));
}
}
if (outputStream.Length == 0)
{
throw new DownloadException("Zero length stream");
}
if (outputStream.Length < 32)
{
throw new DownloadException("Invalid stream");
}
return(outputStream.ToArray());
}
}
catch (Exception ex) when(ex is OperationCanceledException || ex is ObjectDisposedException)
{
if (httpReadTimeoutTokenSource.IsCancellationRequested)
{
throw new DownloadReadTimeoutException();
}
throw;
}
}
}
}
catch (OperationCanceledException)
{
if (httpHeadersTimeoutTokenSource.IsCancellationRequested)
{
throw new DownloadHeadersTimeoutException();
}
else
{
throw;
}
}
}
}
