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KernelHubConnection.cs
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KernelHubConnection.cs
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// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using System;
using System.Reactive.Disposables;
using System.Threading.Tasks;
using Microsoft.AspNetCore.SignalR;
using Microsoft.DotNet.Interactive.Events;
using Microsoft.DotNet.Interactive.Connection;
namespace Microsoft.DotNet.Interactive.Http;
public class KernelHubConnection : IDisposable
{
private readonly CompositeDisposable _disposables = new();
private readonly SignalRBackchannelKernelClient _backchannelKernelClient;
private bool _registered;
public Kernel Kernel { get; }
public KernelHubConnection(Kernel kernel, SignalRBackchannelKernelClient backchannelKernelClient)
{
Kernel = kernel;
_backchannelKernelClient = backchannelKernelClient;
}
public void RegisterContext(IHubContext<KernelHub> hubContext)
{
if (!_registered)
{
_registered = true;
_disposables.Add(Kernel.KernelEvents.Subscribe(onNext: async kernelEvent =>
await PublishEventToContext(kernelEvent, hubContext)));
_backchannelKernelClient.SetContext(hubContext);
}
}
internal Task HandleKernelEventFromClientAsync(IKernelEventEnvelope envelope) => _backchannelKernelClient.HandleKernelEventFromClientAsync(envelope);
private async Task PublishEventToContext(KernelEvent kernelEvent, IHubContext<KernelHub> hubContext)
{
var eventEnvelope = KernelEventEnvelope.Create(kernelEvent);
await hubContext.Clients.All.SendAsync("kernelEventFromServer", KernelEventEnvelope.Serialize(eventEnvelope));
//fis : remove this later
await hubContext.Clients.All.SendAsync("kernelEvent", KernelEventEnvelope.Serialize(eventEnvelope));
}
public void Dispose()
{
_disposables.Dispose();
_registered = false;
}
}