public async Task <IObservable <string> > ServerPullAsync()
{
int retries = 0;
while (true)
{
WebException webException;
HttpWebResponse httpWebResponse;
try
{
var response = await webRequest.GetResponseAsync();
var stream = response.GetResponseStreamWithHttpDecompression();
var observableLineStream = new ObservableLineStream(stream, () =>
{
webRequest.Abort();
response.Close();
});
observableLineStream.Start();
return((IObservable <string>)observableLineStream);
}
catch (WebException e)
{
if (++retries >= 3 || disabledAuthRetries)
{
throw;
}
httpWebResponse = e.Response as HttpWebResponse;
if (httpWebResponse == null ||
(httpWebResponse.StatusCode != HttpStatusCode.Unauthorized &&
httpWebResponse.StatusCode != HttpStatusCode.Forbidden &&
httpWebResponse.StatusCode != HttpStatusCode.PreconditionFailed))
{
throw;
}
webException = e;
}
if (httpWebResponse.StatusCode == HttpStatusCode.Forbidden)
{
await HandleForbiddenResponseAsync(httpWebResponse);
await new CompletedTask(webException).Task; // Throws, preserving original stack
}
if (await HandleUnauthorizedResponseAsync(httpWebResponse) == false)
{
await new CompletedTask(webException).Task; // Throws, preserving original stack
}
}
}
public Task <IObservable <string> > ServerPullAsync(int retries = 0)
{
return(Task.Factory.FromAsync <WebResponse>(webRequest.BeginGetResponse, webRequest.EndGetResponse, null)
.ContinueWith(task =>
{
var stream = task.Result.GetResponseStreamWithHttpDecompression();
var observableLineStream = new ObservableLineStream(stream, () =>
{
webRequest.Abort();
task.Result.Close();
});
observableLineStream.Start();
return (IObservable <string>)observableLineStream;
})
.ContinueWith(task =>
{
var webException = task.Exception.ExtractSingleInnerException() as WebException;
if (webException == null || retries >= 3)
{
return task; // effectively throw
}
var httpWebResponse = webException.Response as HttpWebResponse;
if (httpWebResponse == null ||
(httpWebResponse.StatusCode != HttpStatusCode.Unauthorized &&
httpWebResponse.StatusCode != HttpStatusCode.Forbidden &&
httpWebResponse.StatusCode != HttpStatusCode.PreconditionFailed))
{
return task; // effectively throw
}
if (httpWebResponse.StatusCode == HttpStatusCode.Forbidden)
{
HandleForbiddenResponseAsync(httpWebResponse);
return task;
}
var authorizeResponse = HandleUnauthorizedResponseAsync(httpWebResponse);
if (authorizeResponse == null)
{
return task; // effectively throw
}
return authorizeResponse
.ContinueWith(_ =>
{
_.Wait(); //throw on error
return ServerPullAsync(retries + 1);
})
.Unwrap();
}).Unwrap());
}
public async Task <IObservable <string> > ServerPullAsync()
{
return(await RunWithAuthRetry(async() =>
{
var httpRequestMessage = new HttpRequestMessage(new HttpMethod(Method), Url);
this.Response = await httpClient.SendAsync(httpRequestMessage, HttpCompletionOption.ResponseHeadersRead);
SetResponseHeaders(Response);
await CheckForErrorsAndReturnCachedResultIfAnyAsync(readErrorString: true).ConfigureAwait(false);
var stream = await Response.Content.ReadAsStreamAsync();
var observableLineStream = new ObservableLineStream(stream, () => Response.Dispose());
observableLineStream.Start();
return (IObservable <string>)observableLineStream;
}).ConfigureAwait(false));
}