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V8DebugClient.cs
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163 lines (138 loc) · 4.81 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System;
using System.Collections.Concurrent;
using System.Diagnostics.CodeAnalysis;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.ClearScript.Util;
using Microsoft.ClearScript.Util.Web;
namespace Microsoft.ClearScript.V8
{
[SuppressMessage("Microsoft.Design", "CA1001:TypesThatOwnDisposableFieldsShouldBeDisposable", Justification = "This class uses a custom method for deterministic teardown.")]
internal sealed class V8DebugClient
{
#region data
private readonly V8DebugAgent agent;
private readonly WebSocket webSocket;
private readonly ConcurrentQueue<string> queue = new ConcurrentQueue<string>();
private readonly SemaphoreSlim sendSemaphore = new SemaphoreSlim(1);
private readonly InterlockedOneWayFlag disposedFlag = new InterlockedOneWayFlag();
#endregion
#region initialization
public V8DebugClient(V8DebugAgent agent, WebSocket webSocket)
{
this.agent = agent;
this.webSocket = webSocket;
}
public void Start()
{
StartReceiveMessage();
}
#endregion
#region inbound message reception
private void StartReceiveMessage()
{
webSocket.ReceiveMessageAsync().ContinueWith(OnMessageReceived);
}
private void OnMessageReceived(Task<WebSocket.Message> task)
{
try
{
var message = task.Result;
if (!disposedFlag.IsSet)
{
if (message.IsBinary)
{
OnFailed(WebSocket.ErrorCode.InvalidMessageType, "Received unexpected binary message from WebSocket");
}
else
{
agent.SendCommand(this, Encoding.UTF8.GetString(message.Payload));
StartReceiveMessage();
}
}
}
catch (AggregateException aggregateException)
{
aggregateException.Handle(exception =>
{
if (!disposedFlag.IsSet)
{
if (exception is WebSocket.Exception webSocketException)
{
OnFailed(webSocketException.ErrorCode, webSocketException.Message);
}
else
{
OnFailed(WebSocket.ErrorCode.ProtocolError, "Could not receive message from WebSocket");
}
}
return true;
});
}
}
#endregion
#region outbound message delivery
public void SendMessage(string message)
{
if (!disposedFlag.IsSet)
{
queue.Enqueue(message);
SendMessagesAsync().ContinueWith(OnMessagesSent);
}
}
private async Task SendMessagesAsync()
{
using (await sendSemaphore.CreateLockScopeAsync().ConfigureAwait(false))
{
while (queue.TryDequeue(out var message))
{
await webSocket.SendMessageAsync(Encoding.UTF8.GetBytes(message)).ConfigureAwait(false);
}
}
}
private void OnMessagesSent(Task task)
{
try
{
task.Wait();
}
catch (AggregateException aggregateException)
{
aggregateException.Handle(exception =>
{
if (!disposedFlag.IsSet)
{
if (exception is WebSocket.Exception webSocketException)
{
OnFailed(webSocketException.ErrorCode, webSocketException.Message);
}
else
{
OnFailed(WebSocket.ErrorCode.ProtocolError, "Could not send message to WebSocket");
}
}
return true;
});
}
}
#endregion
#region teardown
private void OnFailed(WebSocket.ErrorCode errorCode, string message)
{
Dispose(errorCode, message);
agent.OnClientFailed(this);
}
public void Dispose(WebSocket.ErrorCode errorCode, string message)
{
if (disposedFlag.Set())
{
webSocket.Close(errorCode, message);
sendSemaphore.Dispose();
}
}
#endregion
}
}