/
ServerSentEventsTransport.cs
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/
ServerSentEventsTransport.cs
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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.md in the project root for license information.
using System.Diagnostics;
using System.Threading.Tasks;
using Microsoft.AspNet.SignalR.Infrastructure;
namespace Microsoft.AspNet.SignalR.Transports
{
public class ServerSentEventsTransport : ForeverTransport
{
public ServerSentEventsTransport(HostContext context, IDependencyResolver resolver)
: base(context, resolver)
{
}
public override Task KeepAlive()
{
if (!InitializeTcs.Task.IsCompleted)
{
return TaskAsyncHelper.Empty;
}
return EnqueueOperation(() =>
{
OutputWriter.Write("data: {}");
OutputWriter.WriteLine();
OutputWriter.WriteLine();
OutputWriter.Flush();
return Context.Response.FlushAsync();
});
}
public override Task Send(PersistentResponse response)
{
OnSendingResponse(response);
return EnqueueOperation(() =>
{
OutputWriter.Write("data: ");
JsonSerializer.Serialize(response, OutputWriter);
OutputWriter.WriteLine();
OutputWriter.WriteLine();
OutputWriter.Flush();
return Context.Response.FlushAsync();
});
}
protected override Task InitializeResponse(ITransportConnection connection)
{
return base.InitializeResponse(connection)
.Then(() =>
{
Context.Response.ContentType = "text/event-stream";
// "data: initialized\n\n"
OutputWriter.Write("data: initialized");
OutputWriter.WriteLine();
OutputWriter.WriteLine();
OutputWriter.Flush();
return Context.Response.FlushAsync();
});
}
}
}