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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System.Collections.Concurrent;
using System.Diagnostics.CodeAnalysis;
using System.Net.WebSockets;
using System.Text;
using System.Threading;
using Microsoft.ClearScript.Util;
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 AutoResetEvent queueEvent = new AutoResetEvent(false);
private RegisteredWaitHandle queueWaitHandle;
private InterlockedDisposedFlag disposedFlag = new InterlockedDisposedFlag();
#endregion
#region initialization
public V8DebugClient(V8DebugAgent agent, WebSocket webSocket)
{
this.agent = agent;
this.webSocket = webSocket;
}
public void Start()
{
RegisterWaitForQueueEvent();
StartReceiveMessage();
}
#endregion
#region inbound message processing
private void StartReceiveMessage()
{
if (!MiscHelpers.Try(() => webSocket.ReceiveMessageAsync(WebSocketMessageType.Text, OnMessageReceived)))
{
OnFailed(WebSocketCloseStatus.ProtocolError, "Could not receive data from web socket");
}
}
private void OnMessageReceived(byte[] bytes, WebSocketCloseStatus status, string errorMessage)
{
if (!disposedFlag.IsSet)
{
if (bytes == null)
{
OnFailed(status, errorMessage);
}
else
{
agent.SendCommand(this, Encoding.UTF8.GetString(bytes));
StartReceiveMessage();
}
}
}
#endregion
#region outbound message queue
public void SendMessage(string message)
{
if (!disposedFlag.IsSet)
{
queue.Enqueue(message);
MiscHelpers.Try(() => queueEvent.Set());
}
}
private void RegisterWaitForQueueEvent()
{
RegisteredWaitHandle newQueueWaitHandle;
if (MiscHelpers.Try(out newQueueWaitHandle, () => ThreadPool.RegisterWaitForSingleObject(queueEvent, OnQueueEvent, null, Timeout.Infinite, true)))
{
var oldQueueWaitHandle = Interlocked.Exchange(ref queueWaitHandle, newQueueWaitHandle);
if (oldQueueWaitHandle != null)
{
oldQueueWaitHandle.Unregister(null);
}
}
}
private void OnQueueEvent(object state, bool timedOut)
{
if (!disposedFlag.IsSet)
{
string message;
if (queue.TryDequeue(out message))
{
if (!MiscHelpers.Try(() => webSocket.SendMessageAsync(WebSocketMessageType.Text, Encoding.UTF8.GetBytes(message), OnMessageSent)))
{
OnFailed(WebSocketCloseStatus.ProtocolError, "Could not send data to web socket");
}
}
else
{
RegisterWaitForQueueEvent();
}
}
}
private void OnMessageSent(bool succeeded, WebSocketCloseStatus status, string errorMessage)
{
if (!disposedFlag.IsSet)
{
if (succeeded)
{
OnQueueEvent(null, false);
}
else
{
OnFailed(status, errorMessage);
}
}
}
#endregion
#region shutdown
private void OnFailed(WebSocketCloseStatus status, string errorMessage)
{
Dispose(status, errorMessage);
agent.OnClientFailed(this);
}
public void Dispose(WebSocketCloseStatus status, string errorMessage)
{
if (disposedFlag.Set())
{
switch (webSocket.State)
{
case WebSocketState.Connecting:
case WebSocketState.Open:
case WebSocketState.CloseReceived:
MiscHelpers.Try(() => webSocket.CloseOutputAsync(status, errorMessage, CancellationToken.None));
break;
}
var tempQueueWaitHandle = queueWaitHandle;
if (tempQueueWaitHandle != null)
{
tempQueueWaitHandle.Unregister(null);
}
queueEvent.Close();
}
}
#endregion
}
}