/// <inheritdoc />
public override async Task <int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
int?result = null;
await Retry.Do(
CustomHttpClient.RetryTimes,
CustomHttpClient.RetryDelay,
async() =>
{
try
{
if ((position != lastposition) || (responseStream == null))
{
if (position != lastposition)
{
Close();
}
lastposition = position;
var client = await http.GetHttpClient(url);
if (position != 0)
{
client.AddRange(position);
}
client.Method = "GET";
response = (HttpWebResponse)await client.GetResponseAsync();
var lengthStr = response.GetResponseHeader("Content-Length");
long len;
if (long.TryParse(lengthStr, out len))
{
length = position + len;
}
responseStream = response.GetResponseStream();
if (InitialSeek.HasValue)
{
responseStream?.Seek(InitialSeek.Value, SeekOrigin.Current);
}
}
Contract.Assert(responseStream != null, "responseStream!=null");
result = await responseStream.ReadAsync(buffer, offset, count, cancellationToken);
position += result.Value;
lastposition += result.Value;
return(true);
}
catch (Exception)
{
Close();
throw;
}
}, http.GeneralExceptionProcessor).ConfigureAwait(false);
if (result == null)
{
throw new NullReferenceException("Read result was not set");
}
return(result.Value);
}