/// <summary>
/// Discovers topic and hub URLs based on publisher's content URL and performs subscription request.
/// </summary>
/// <param name="parameters">The parameters.</param>
/// <param name="cancellationToken">The cancellation token to cancel operation.</param>
/// <returns>The task object representing the asynchronous operation.</returns>
public async Task <WebSubSubscribedUrls> SubscribeAsync(WebSubSubscribeParameters parameters, CancellationToken cancellationToken)
{
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
WebSubDiscoveredUrls discovery = await _webSubDiscoverer.DiscoverAsync(parameters.ContentUrl, cancellationToken);
await CallOnDiscovered(parameters, discovery, cancellationToken);
string subscriptionHubUrl = null;
Dictionary <string, HttpResponseMessage> hubsResponses = new Dictionary <string, HttpResponseMessage>();
FormUrlEncodedContent subscribeRequestContent = PrepareSubscribeRequestContent(discovery.Topic, parameters);
foreach (string hubUrl in discovery.Hubs)
{
HttpResponseMessage hubResponse = await _httpClient.PostAsync(hubUrl, subscribeRequestContent, cancellationToken);
if (hubResponse.StatusCode == HttpStatusCode.Accepted)
{
subscriptionHubUrl = hubUrl;
break;
}
hubsResponses.Add(hubUrl, hubResponse);
}
if (String.IsNullOrWhiteSpace(subscriptionHubUrl))
{
throw new WebSubSubscriptionException("None of discovered hubs have accepted the request.", hubsResponses);
}
return(new WebSubSubscribedUrls(discovery.Topic, subscriptionHubUrl));
}
public async Task Discover_HttpHeaderDiscoveryUrl_DiscoversCorrectTopic()
{
WebSubDiscoverer webSubRocksWebSubDiscoverer = PrepareWebSubRocksWebSubDiscoverer();
WebSubDiscoveredUrls webSubRocksWebSubDiscovery = await webSubRocksWebSubDiscoverer.DiscoverAsync(WebSubRocksConstants.HTTP_HEADER_DISCOVERY_URL, CancellationToken.None);
Assert.Equal(WebSubRocksConstants.HTTP_HEADER_DISCOVERY_TOPIC_URL, webSubRocksWebSubDiscovery.Topic);
}
public async Task Discover_HttpHeaderDiscoveryUrl_DiscoversCorrectHub()
{
WebSubDiscoverer webSubRocksWebSubDiscoverer = PrepareWebSubRocksWebSubDiscoverer();
WebSubDiscoveredUrls webSubRocksWebSubDiscovery = await webSubRocksWebSubDiscoverer.DiscoverAsync(WebSubRocksConstants.HTTP_HEADER_DISCOVERY_URL, CancellationToken.None);
Assert.Contains(WebSubRocksConstants.HTTP_HEADER_DISCOVERY_HUB_URL, webSubRocksWebSubDiscovery.Hubs);
}
public async void Discover_HttpHeaderDiscoveryUrl_DiscoversSingleHub()
{
WebSubDiscoverer webSubRocksWebSubDiscoverer = PrepareWebSubRocksWebSubDiscoverer();
WebSubDiscoveredUrls webSubRocksWebSubDiscovery = await webSubRocksWebSubDiscoverer.DiscoverAsync(WebSubRocksConstants.HTTP_HEADER_DISCOVERY_URL, CancellationToken.None);
Assert.Single(webSubRocksWebSubDiscovery.Hubs);
}
private static Task <WebSubDiscoveredUrls> GetHttpHeaderWebSubDiscovery()
{
WebSubDiscoveredUrls webSubDiscovery = new WebSubDiscoveredUrls
{
Topic = WebSubRocksConstants.HTTP_HEADER_DISCOVERY_TOPIC_URL
};
webSubDiscovery.AddHub(WebSubRocksConstants.HTTP_HEADER_DISCOVERY_HUB_URL);
return(Task.FromResult(webSubDiscovery));
}
private static async Task CallOnDiscovered(WebSubSubscribeParameters parameters, WebSubDiscoveredUrls discovery, CancellationToken cancellationToken)
{
parameters.OnDiscovered?.Invoke(discovery);
if (parameters.OnDiscoveredAsync != null)
{
await parameters.OnDiscoveredAsync(discovery, cancellationToken);
}
}
