jellyfin-server/MediaBrowser.Common/Net/BasePeriodicWebSocketListener.cs

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using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Net;
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using System;
using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
using System.Threading;
using System.Threading.Tasks;
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namespace MediaBrowser.Common.Net
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{
/// <summary>
/// Starts sending data over a web socket periodically when a message is received, and then stops when a corresponding stop message is received
/// </summary>
/// <typeparam name="TReturnDataType">The type of the T return data type.</typeparam>
/// <typeparam name="TStateType">The type of the T state type.</typeparam>
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public abstract class BasePeriodicWebSocketListener<TReturnDataType, TStateType> : IWebSocketListener, IDisposable
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where TStateType : WebSocketListenerState, new()
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where TReturnDataType : class
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{
/// <summary>
/// The _active connections
/// </summary>
protected readonly List<Tuple<IWebSocketConnection, CancellationTokenSource, Timer, TStateType, SemaphoreSlim>> ActiveConnections =
new List<Tuple<IWebSocketConnection, CancellationTokenSource, Timer, TStateType, SemaphoreSlim>>();
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/// <summary>
/// Gets the name.
/// </summary>
/// <value>The name.</value>
protected abstract string Name { get; }
/// <summary>
/// Gets the data to send.
/// </summary>
/// <param name="state">The state.</param>
/// <returns>Task{`1}.</returns>
protected abstract Task<TReturnDataType> GetDataToSend(TStateType state);
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/// <summary>
/// The logger
/// </summary>
protected ILogger Logger;
/// <summary>
/// Initializes a new instance of the <see cref="BasePeriodicWebSocketListener{TStateType}" /> class.
/// </summary>
/// <param name="logger">The logger.</param>
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/// <exception cref="System.ArgumentNullException">logger</exception>
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protected BasePeriodicWebSocketListener(ILogger logger)
{
if (logger == null)
{
throw new ArgumentNullException("logger");
}
Logger = logger;
}
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/// <summary>
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/// The null task result
/// </summary>
protected Task NullTaskResult = Task.FromResult(true);
/// <summary>
/// Processes the message.
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/// </summary>
/// <param name="message">The message.</param>
/// <returns>Task.</returns>
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public Task ProcessMessage(WebSocketMessageInfo message)
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{
if (message.MessageType.Equals(Name + "Start", StringComparison.OrdinalIgnoreCase))
{
Start(message);
}
if (message.MessageType.Equals(Name + "Stop", StringComparison.OrdinalIgnoreCase))
{
Stop(message);
}
return NullTaskResult;
}
protected readonly CultureInfo UsCulture = new CultureInfo("en-US");
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protected virtual bool SendOnTimer
{
get
{
return true;
}
}
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/// <summary>
/// Starts sending messages over a web socket
/// </summary>
/// <param name="message">The message.</param>
private void Start(WebSocketMessageInfo message)
{
var vals = message.Data.Split(',');
var dueTimeMs = long.Parse(vals[0], UsCulture);
var periodMs = long.Parse(vals[1], UsCulture);
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var cancellationTokenSource = new CancellationTokenSource();
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Logger.Info("{1} Begin transmitting over websocket to {0}", message.Connection.RemoteEndPoint, GetType().Name);
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var timer = SendOnTimer ?
new Timer(TimerCallback, message.Connection, Timeout.Infinite, Timeout.Infinite) :
null;
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var state = new TStateType
{
IntervalMs = periodMs,
InitialDelayMs = dueTimeMs
};
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var semaphore = new SemaphoreSlim(1, 1);
lock (ActiveConnections)
{
ActiveConnections.Add(new Tuple<IWebSocketConnection, CancellationTokenSource, Timer, TStateType, SemaphoreSlim>(message.Connection, cancellationTokenSource, timer, state, semaphore));
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}
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if (timer != null)
{
timer.Change(TimeSpan.FromMilliseconds(dueTimeMs), TimeSpan.FromMilliseconds(periodMs));
}
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}
/// <summary>
/// Timers the callback.
/// </summary>
/// <param name="state">The state.</param>
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private void TimerCallback(object state)
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{
var connection = (IWebSocketConnection)state;
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Tuple<IWebSocketConnection, CancellationTokenSource, Timer, TStateType, SemaphoreSlim> tuple;
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lock (ActiveConnections)
{
tuple = ActiveConnections.FirstOrDefault(c => c.Item1 == connection);
}
if (tuple == null)
{
return;
}
if (connection.State != WebSocketState.Open || tuple.Item2.IsCancellationRequested)
{
DisposeConnection(tuple);
return;
}
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SendData(tuple);
}
protected void SendData(bool force)
{
List<Tuple<IWebSocketConnection, CancellationTokenSource, Timer, TStateType, SemaphoreSlim>> tuples;
lock (ActiveConnections)
{
tuples = ActiveConnections
.Where(c =>
{
if (c.Item1.State == WebSocketState.Open && !c.Item2.IsCancellationRequested)
{
var state = c.Item4;
if (force || (DateTime.UtcNow - state.DateLastSendUtc).TotalMilliseconds >= state.IntervalMs)
{
return true;
}
}
return false;
})
.ToList();
}
foreach (var tuple in tuples)
{
SendData(tuple);
}
}
private async void SendData(Tuple<IWebSocketConnection, CancellationTokenSource, Timer, TStateType, SemaphoreSlim> tuple)
{
var connection = tuple.Item1;
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try
{
await tuple.Item5.WaitAsync(tuple.Item2.Token).ConfigureAwait(false);
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var state = tuple.Item4;
var data = await GetDataToSend(state).ConfigureAwait(false);
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if (data != null)
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{
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await connection.SendAsync(new WebSocketMessage<TReturnDataType>
{
MessageType = Name,
Data = data
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}, tuple.Item2.Token).ConfigureAwait(false);
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state.DateLastSendUtc = DateTime.UtcNow;
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}
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tuple.Item5.Release();
}
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catch (OperationCanceledException)
{
if (tuple.Item2.IsCancellationRequested)
{
DisposeConnection(tuple);
}
}
catch (Exception ex)
{
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Logger.ErrorException("Error sending web socket message {0}", ex, Name);
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DisposeConnection(tuple);
}
}
/// <summary>
/// Stops sending messages over a web socket
/// </summary>
/// <param name="message">The message.</param>
private void Stop(WebSocketMessageInfo message)
{
lock (ActiveConnections)
{
var connection = ActiveConnections.FirstOrDefault(c => c.Item1 == message.Connection);
if (connection != null)
{
DisposeConnection(connection);
}
}
}
/// <summary>
/// Disposes the connection.
/// </summary>
/// <param name="connection">The connection.</param>
private void DisposeConnection(Tuple<IWebSocketConnection, CancellationTokenSource, Timer, TStateType, SemaphoreSlim> connection)
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{
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Logger.Info("{1} stop transmitting over websocket to {0}", connection.Item1.RemoteEndPoint, GetType().Name);
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var timer = connection.Item3;
if (timer != null)
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{
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try
{
timer.Dispose();
}
catch (ObjectDisposedException)
{
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}
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}
try
{
connection.Item2.Cancel();
connection.Item2.Dispose();
}
catch (ObjectDisposedException)
{
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}
try
{
connection.Item5.Dispose();
}
catch (ObjectDisposedException)
{
}
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ActiveConnections.Remove(connection);
}
/// <summary>
/// Releases unmanaged and - optionally - managed resources.
/// </summary>
/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
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protected virtual void Dispose(bool dispose)
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{
if (dispose)
{
lock (ActiveConnections)
{
foreach (var connection in ActiveConnections.ToList())
{
DisposeConnection(connection);
}
}
}
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}
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/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
Dispose(true);
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}
}
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public class WebSocketListenerState
{
public DateTime DateLastSendUtc { get; set; }
public long InitialDelayMs { get; set; }
public long IntervalMs { get; set; }
}
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}