/// <summary>
/// create TCP unix domain socket client and connect to server
/// </summary>
/// <param name="domainSocketPath">path to unix domain socket</param>
/// <exception cref="SocketException">unix domain socket not supported or server does not listen</exception>
/// <returns>TCP socket client.</returns>
public static SocketTcpClient ConnectUds(string domainSocketPath)
{
var client = new SocketTcpClient(AddressFamily.Unix, ProtocolType.IP);
client.socket.Connect(new UnixDomainSocketEndPoint(domainSocketPath));
return(client);
}
public TcpWorker(IServiceProvider provider, MessagePipeInterprocessTcpOptions options, IAsyncPublisher <IInterprocessKey, IInterprocessValue> publisher)
{
this.provider = provider;
this.cancellationTokenSource = new CancellationTokenSource();
this.options = options;
this.publisher = publisher;
this.server = new Lazy <SocketTcpServer>(() =>
{
return(SocketTcpServer.Listen(options.Host, options.Port));
});
this.client = new Lazy <SocketTcpClient>(() =>
{
return(SocketTcpClient.Connect(options.Host, options.Port));
});
#if !UNITY_2018_3_OR_NEWER
this.channel = Channel.CreateUnbounded <byte[]>(new UnboundedChannelOptions()
{
SingleReader = true,
SingleWriter = false,
AllowSynchronousContinuations = true
});
#else
this.channel = Channel.CreateSingleConsumerUnbounded <byte[]>();
#endif
if (options.HostAsServer != null && options.HostAsServer.Value)
{
StartReceiver();
}
}
public static SocketTcpClient Connect(string host, int port)
{
var ip = new IPEndPoint(IPAddress.Parse(host), port);
var client = new SocketTcpClient(ip.AddressFamily, ProtocolType.Tcp);
client.socket.Connect(ip);
return(client);
}
static async ValueTask ReadFullyAsync(byte[] buffer, SocketTcpClient client, int index, int remain, CancellationToken token)
{
while (remain > 0)
{
var len = await client.ReceiveAsync(buffer, index, remain, token).ConfigureAwait(false);
index += len;
remain -= len;
}
}
// Receive from tcp socket and push value to subscribers.
async void RunReceiveLoop(SocketTcpClient client)
{
var token = cancellationTokenSource.Token;
var buffer = new byte[65536];
ReadOnlyMemory <byte> readBuffer = Array.Empty <byte>();
while (!token.IsCancellationRequested)
{
ReadOnlyMemory <byte> value = Array.Empty <byte>();
try
{
if (readBuffer.Length == 0)
{
var readLen = await client.ReceiveAsync(buffer, 0, buffer.Length, token).ConfigureAwait(false);
if (readLen == 0)
{
return; // end of stream(disconnect)
}
readBuffer = buffer.AsMemory(0, readLen);
}
else if (readBuffer.Length < 4) // rare case
{
var readLen = await client.ReceiveAsync(buffer, 0, buffer.Length, token).ConfigureAwait(false);
if (readLen == 0)
{
return;
}
var newBuffer = new byte[readBuffer.Length + readLen];
readBuffer.CopyTo(newBuffer);
buffer.AsSpan(readLen).CopyTo(newBuffer.AsSpan(readBuffer.Length));
readBuffer = newBuffer;
}
var messageLen = MessageBuilder.FetchMessageLength(readBuffer.Span);
if (readBuffer.Length == (messageLen + 4)) // just size
{
value = readBuffer.Slice(4, messageLen); // skip length header
readBuffer = Array.Empty <byte>();
goto PARSE_MESSAGE;
}
else if (readBuffer.Length > (messageLen + 4)) // over size
{
value = readBuffer.Slice(4, messageLen);
readBuffer = readBuffer.Slice(messageLen + 4);
goto PARSE_MESSAGE;
}
else // needs to read more
{
var readLen = readBuffer.Length;
if (readLen < (messageLen + 4))
{
if (readBuffer.Length != buffer.Length)
{
var newBuffer = new byte[buffer.Length];
readBuffer.CopyTo(newBuffer);
buffer = newBuffer;
}
if (buffer.Length < messageLen + 4)
{
Array.Resize(ref buffer, messageLen + 4);
}
}
var remain = messageLen - (readLen - 4);
await ReadFullyAsync(buffer, client, readLen, remain, token).ConfigureAwait(false);
value = buffer.AsMemory(4, messageLen);
readBuffer = Array.Empty <byte>();
goto PARSE_MESSAGE;
}
}
catch (Exception ex)
{
if (ex is OperationCanceledException)
{
return;
}
if (token.IsCancellationRequested)
{
return;
}
// network error, terminate.
options.UnhandledErrorHandler("network error, receive loop will terminate." + Environment.NewLine, ex);
return;
}
PARSE_MESSAGE:
try
{
var message = MessageBuilder.ReadPubSubMessage(value.ToArray()); // can avoid copy?
switch (message.MessageType)
{
case MessageType.PubSub:
publisher.Publish(message, message, CancellationToken.None);
break;
case MessageType.RemoteRequest:
{
// NOTE: should use without reflection(Expression.Compile)
var header = Deserialize <RequestHeader>(message.KeyMemory, options.MessagePackSerializerOptions);
var(mid, reqTypeName, resTypeName) = (header.MessageId, header.RequestType, header.ResponseType);
byte[] resultBytes;
try
{
var t = AsyncRequestHandlerRegistory.Get(reqTypeName, resTypeName);
var interfaceType = t.GetInterfaces().First(x => x.IsGenericType && x.Name.StartsWith("IAsyncRequestHandler"));
var coreInterfaceType = t.GetInterfaces().First(x => x.IsGenericType && x.Name.StartsWith("IAsyncRequestHandlerCore"));
var service = provider.GetRequiredService(interfaceType); // IAsyncRequestHandler<TRequest,TResponse>
var genericArgs = interfaceType.GetGenericArguments(); // [TRequest, TResponse]
// Unity IL2CPP does not work(can not invoke nongenerics MessagePackSerializer)
var request = MessagePackSerializer.Deserialize(genericArgs[0], message.ValueMemory, options.MessagePackSerializerOptions);
var responseTask = coreInterfaceType.GetMethod("InvokeAsync") !.Invoke(service, new[] { request, CancellationToken.None });
#if !UNITY_2018_3_OR_NEWER
var task = typeof(ValueTask <>).MakeGenericType(genericArgs[1]).GetMethod("AsTask") !.Invoke(responseTask, null);
#else
var asTask = typeof(UniTaskExtensions).GetMethods().First(x => x.IsGenericMethod && x.Name == "AsTask")
.MakeGenericMethod(genericArgs[1]);
var task = asTask.Invoke(null, new[] { responseTask });
#endif
await((System.Threading.Tasks.Task)task !); // Task<T> -> Task
var result = task.GetType().GetProperty("Result") !.GetValue(task);
resultBytes = MessageBuilder.BuildRemoteResponseMessage(mid, genericArgs[1], result !, options.MessagePackSerializerOptions);
}
catch (Exception ex)
{
// NOTE: ok to send stacktrace?
resultBytes = MessageBuilder.BuildRemoteResponseError(mid, ex.ToString(), options.MessagePackSerializerOptions);
}
await client.SendAsync(resultBytes).ConfigureAwait(false);
}
break;
case MessageType.RemoteResponse:
case MessageType.RemoteError:
{
var mid = Deserialize <int>(message.KeyMemory, options.MessagePackSerializerOptions);
if (responseCompletions.TryRemove(mid, out var tcs))
{
if (message.MessageType == MessageType.RemoteResponse)
{
tcs.TrySetResult(message); // synchronous completion, use memory buffer immediately.
}
else
{
var errorMsg = MessagePackSerializer.Deserialize <string>(message.ValueMemory, options.MessagePackSerializerOptions);
tcs.TrySetException(new RemoteRequestException(errorMsg));
}
}
}
break;
default:
break;
}
}
catch (Exception ex)
{
if (ex is OperationCanceledException)
{
continue;
}
options.UnhandledErrorHandler("", ex);
}
}
}