/// <summary>
/// Returns a handler for incoming Web stream requests.
/// </summary>
/// <param name="route">
/// The handler.
/// </param>
/// <param name="controller">
/// The controller.
/// </param>
/// <param name="args">
/// The request parameters.
/// </param>
/// <param name="environment">
/// The environment.
/// </param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>
/// A handler for incoming Web stream requests.
/// </returns>
public static async Task HttpRequestHandler(
this ControllerRoute route,
object controller,
IDictionary<string, string> args,
IOwinContext environment,
CancellationToken cancellationToken)
{
var response = environment.Response;
var pump = new MutuallyExclusiveTaskExecutor();
var outgoing =
GetObservableFromHandler(() => route.Invoke(controller, args, _ => Observable.Empty<string>()));
var headersWritten = new[] { false };
response.Headers.Set("Transfer-Encoding", "Chunked");
response.ContentType = "application/json";
// Hook up the outgoing message pump to the response body.
var subscription = outgoing.Subscribe(
msg => pump.Schedule(
async () =>
{
try
{
if (!headersWritten[0])
{
headersWritten[0] = true;
// Set the response headers.
response.StatusCode = 200;
}
await response.WriteAsync(msg, cancellationToken);
await response.Body.FlushAsync(cancellationToken);
}
catch
{
pump.Complete();
throw;
}
}),
e => pump.Schedule(
async () =>
{
try
{
if (!headersWritten[0])
{
// Set the response headers.
response.StatusCode = 500;
headersWritten[0] = true;
}
await response.WriteAsync(e.ToString(), cancellationToken);
await response.Body.FlushAsync(cancellationToken);
}
finally
{
pump.Complete();
}
}),
() => pump.Schedule(
() =>
{
if (!headersWritten[0])
{
// No content.
response.StatusCode = 204;
response.Body.Close();
response.Body = Stream.Null;
headersWritten[0] = true;
}
pump.Complete();
return Task.FromResult(0);
}));
// When the cancellation token is cancelled, unsubscribe.
cancellationToken.Register(subscription.Dispose);
try
{
await pump.Run(cancellationToken);
}
finally
{
subscription.Dispose();
}
}
/// <summary>
/// Returns a handler for incoming Web stream requests.
/// </summary>
/// <param name="route">
/// The handler.
/// </param>
/// <param name="controller">
/// The controller.
/// </param>
/// <param name="args">
/// The request parameters.
/// </param>
/// <param name="environment">
/// The environment.
/// </param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>
/// A handler for incoming Web stream requests.
/// </returns>
public static async Task HttpRequestHandler(
this ControllerRoute route,
object controller,
IDictionary <string, string> args,
IOwinContext environment,
CancellationToken cancellationToken)
{
var response = environment.Response;
var pump = new MutuallyExclusiveTaskExecutor();
var outgoing =
GetObservableFromHandler(() => route.Invoke(controller, args, _ => Observable.Empty <string>()));
var headersWritten = new[] { false };
response.Headers.Set("Transfer-Encoding", "Chunked");
response.ContentType = "application/json";
// Hook up the outgoing message pump to the response body.
var subscription = outgoing.Subscribe(
msg => pump.Schedule(
async() =>
{
try
{
if (!headersWritten[0])
{
headersWritten[0] = true;
// Set the response headers.
response.StatusCode = 200;
}
await response.WriteAsync(msg, cancellationToken);
await response.Body.FlushAsync(cancellationToken);
}
catch
{
pump.Complete();
throw;
}
}),
e => pump.Schedule(
async() =>
{
try
{
if (!headersWritten[0])
{
// Set the response headers.
response.StatusCode = 500;
headersWritten[0] = true;
}
await response.WriteAsync(e.ToString(), cancellationToken);
await response.Body.FlushAsync(cancellationToken);
}
finally
{
pump.Complete();
}
}),
() => pump.Schedule(
() =>
{
if (!headersWritten[0])
{
// No content.
response.StatusCode = 204;
response.Body.Close();
response.Body = Stream.Null;
headersWritten[0] = true;
}
pump.Complete();
return(Task.FromResult(0));
}));
// When the cancellation token is cancelled, unsubscribe.
cancellationToken.Register(subscription.Dispose);
try
{
await pump.Run(cancellationToken);
}
finally
{
subscription.Dispose();
}
}