private async Task ListenToServerEvents()
{
UrlBuilder.AppendToPath(Endpoints.Json);
while (!CancellationToken.IsCancellationRequested)
{
var urlBuilderCopy = UrlBuilder.Copy();
urlBuilderCopy.AddParam(Params.Auth, await IdTokenFactory());
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, new Uri(urlBuilderCopy.Url));
request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("text/event-stream"));
HttpResponseMessage response = await Client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead);
using (Stream stream = await response.Content.ReadAsStreamAsync())
using (StreamReader reader = new StreamReader(stream))
{
while (!CancellationToken.IsCancellationRequested)
{
var serializedEventType = await reader.ReadLineAsync();
if (String.IsNullOrWhiteSpace(serializedEventType))
{
continue;
}
string serializedData = await reader.ReadLineAsync();
ServerEvent serverEvent = ServerEvent.Parse(serializedEventType, serializedData);
if (serverEvent.Type == ServerEventType.AuthRevoked)
{
break;
}
if (serverEvent.Type == ServerEventType.KeepAlive)
{
continue;
}
if (serverEvent.Type == ServerEventType.Cancel)
{
throw new PremissionDeniedException();
}
if (serverEvent.Type == ServerEventType.Put)
{
HandlePut(serverEvent);
}
else if (serverEvent.Type == ServerEventType.Patch)
{
HandlePatch(serverEvent);
}
}
}
}
// We clear all the events
ValueChanged = ChildAdded = ChildChanged = ChildRemoved = null;
}
/// <summary>
/// Reads data stored at the specified reference.
/// </summary>
/// <typeparam name="T">Type of the data.</typeparam>
/// <returns>The deserialized data.</returns>
public async virtual Task <T> Once <T>()
{
UrlBuilder.AppendToPath(Endpoints.Json).AddParam(Params.Auth, await IdTokenFactory());
var response = await Client.GetAsync(UrlBuilder.Url);
try
{
return(await response.Content.ReadAsAsync <T>());
}
catch (JsonSerializationException) { } // Means the content is null
return(default(T));
}
public ChildQuery Child(string name)
{
return(new ChildQuery(UrlBuilder.AppendToPath(name), name, IdTokenFactory));
}
public async Task Update <T>(T value)
{
UrlBuilder.AppendToPath(Endpoints.Json).AddParam(Params.Auth, await IdTokenFactory());
var response = await Client.PatchAsJsonAsync(UrlBuilder.Url, value);
}
/// <summary>
/// Deletes the data at the specified reference.
/// </summary>
/// <returns></returns>
public async Task Remove()
{
UrlBuilder.AppendToPath(Endpoints.Json).AddParam(Params.Auth, await IdTokenFactory());
var response = await Client.DeleteAsync(UrlBuilder.Url);
}