Created
October 3, 2016 18:48
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Basic implementation of TcpPublisher with Rx
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public enum PublisherStatus | |
{ | |
NotRunning, | |
Listenning, | |
Publishing, | |
Stopped, | |
Failed | |
} |
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using System; | |
using System.Collections.Immutable; | |
using System.IO; | |
using System.Net; | |
using System.Net.Sockets; | |
using System.Reactive.Disposables; | |
using System.Reactive.Linq; | |
using System.Reactive.Subjects; | |
using System.Text; | |
using System.Threading.Tasks; | |
using Newtonsoft.Json; | |
public class TcpPublisher<T> : IDisposable | |
{ | |
private readonly TcpListener _listener; | |
private ImmutableList<TcpClient> _clients = ImmutableList<TcpClient>.Empty; | |
private readonly IObservable<T> _source; | |
private CompositeDisposable _dispose = null; | |
private BehaviorSubject<PublisherStatus> _statuses = new BehaviorSubject<PublisherStatus>(PublisherStatus.NotRunning); | |
public TcpPublisher(IObservable<T> source, string address = null, int port = 7000) | |
{ | |
if (source == null) | |
{ | |
throw new ArgumentNullException(nameof(source)); | |
} | |
_source = source; | |
var ip = address == null ? IPAddress.Loopback : IPAddress.Parse(address); | |
_listener = new TcpListener(ip, port); | |
} | |
public void Start() | |
{ | |
if (_dispose == null) | |
{ | |
_listener.Start(); | |
_statuses.OnNext(PublisherStatus.Listenning); | |
var connections = Observable.FromAsync(_listener.AcceptTcpClientAsync) | |
.Repeat() | |
.Subscribe(client => _clients = _clients.Add(client)); | |
var subscription = _source.Subscribe(FanOut); | |
_dispose = new CompositeDisposable( | |
subscription, | |
connections, | |
Disposable.Create(() => _listener.Stop()), | |
Disposable.Create(() => _clients.ForEach(CloseClientConnection)) | |
); | |
} | |
} | |
public void Stop() | |
{ | |
if (_dispose != null) | |
{ | |
_dispose.Dispose(); | |
_dispose = null; | |
_statuses.OnNext(PublisherStatus.Stopped); | |
} | |
} | |
public void Dispose() | |
{ | |
Stop(); | |
} | |
public IObservable<PublisherStatus> GetStatusStream() | |
{ | |
return _statuses.DistinctUntilChanged(); | |
} | |
private void FanOut(T message) | |
{ | |
string payload = JsonConvert.SerializeObject(message); | |
_clients.ForEach(async client => await SendMessageAsync(client, payload)); | |
} | |
private async Task SendMessageAsync(TcpClient client, string payload) | |
{ | |
try | |
{ | |
_statuses.OnNext(PublisherStatus.Publishing); | |
using (var writer = new StreamWriter(client.GetStream(), Encoding.UTF8, 1024, true)) | |
{ | |
await writer.WriteLineAsync(payload); | |
} | |
} | |
catch | |
{ | |
Console.WriteLine($"Error occured while sending message to client."); | |
_clients = _clients.Remove(client); | |
if (_clients.Count == 0) | |
{ | |
_statuses.OnNext(PublisherStatus.Listenning); | |
} | |
} | |
} | |
private void CloseClientConnection(TcpClient client) | |
{ | |
try | |
{ | |
_clients = _clients.Remove(client); | |
client.Dispose(); | |
} | |
catch | |
{ | |
Console.WriteLine($"Error occured while closing connection with client."); | |
} | |
} | |
} |
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