private void incomingMessage(DistributedAppMessage msg)
{
try
{
var @object = null as IConcurrentObject;
var @continue = null as Action <DistributedAppMessage>;
var @remote = null as Action <DistributedAppMessage>;
if (_objects.TryGetValue(msg.Id, out @object))
{
var methods = null as Dictionary <string, MethodFunc>;
if (!_methods.TryGetValue(@object.GetType(), out methods))
{
throw new ArgumentException("type");
}
var method = null as MethodFunc;
if (!methods.TryGetValue(msg.Method, out method))
{
throw new ArgumentException("method");
}
var json = JObject.Parse(msg.Data);
if (json == null)
{
throw new ArgumentException("args");
}
ConcurrentApp.Schedule(@object,
() => method(@object, json,
response => sendResponse(msg, response),
ex => sendFailure(msg, ex)),
ex => sendFailure(msg, ex));
}
else if (_remotes.TryGetValue(msg.Id, out @remote))
{
Debug.Assert(msg.RequestId == Guid.Empty);
msg.RequestId = Guid.NewGuid();
_requests[msg.RequestId] = __res => msg.Success(__res.Data); //td: failure
@remote(msg);
}
else if (_requests.TryRemove(msg.RequestId, out @continue))
{
@continue(msg);
}
else if (msg.Id == Guid.Empty && msg.RequestId == Guid.Empty)
{
internalCommand(msg.Method, msg.Data);
}
else
{
throw new ArgumentException("id");
}
}
catch (Exception ex)
{
sendFailure(msg, ex);
}
}
public static void StartServer(IDistributedApp app, string url, int expectedClients = 0, Action <Exception> connected = null)
{
Task.Run(() =>
{
using (var context = NetMQContext.Create())
using (var input = context.CreateDealerSocket())
{
Dictionary <string, DealerSocket> clients = null;
try
{
input.Bind(url);
if (expectedClients > 0)
{
clients = new Dictionary <string, DealerSocket>();
awaitClients(input, expectedClients, clients, context, app);
app.SendToClient = (client, msg) => writeMessage(clients[client], msg);
}
connected(null);
}
catch (Exception ex)
{
connected(ex);
return;
}
//loop
var message = new NetMQMessage(expectedFrameCount: 7);
var appMessage = new DistributedAppMessage();
for (;;)
{
message = input.ReceiveMultipartMessage(expectedFrameCount: 7);
try
{
if (!readMessage(message, appMessage))
{
continue;
}
app.Receive(appMessage);
}
catch
{
//td: log?
}
finally
{
message.Clear();
}
}
}
});
}
private static void writeMessage(DealerSocket output, DistributedAppMessage appMessage)
{
output.SendFrame(appMessage.Id.ToString(), more: true);
output.SendFrameEmpty(more: true);
output.SendFrame(appMessage.Method ?? string.Empty, more: true);
output.SendFrameEmpty(more: true);
output.SendFrame(appMessage.Data, more: true);
output.SendFrameEmpty(more: true);
output.SendFrame(appMessage.RequestId.ToString());
}
private void sendFailure(DistributedAppMessage msg, Exception ex)
{
if (msg.Failure == null && msg.RequestId == Guid.Empty)
{
return; // no one is waiting for this
}
if (msg.Failure != null)
{
msg.Failure(ex);
}
else
{
var jsonMessage = $"{{\"__ex\": \"{ex.Message}\"}}";
outgoingMessage(Guid.Empty, string.Empty, jsonMessage, msg.RequestId);
}
}
private void sendResponse(DistributedAppMessage msg, object response)
{
if (msg.Success == null && msg.RequestId == Guid.Empty)
{
return; // no one is waiting for this
}
var jsonMessage = $"{{\"__res\": {JsonConvert.SerializeObject(response)}}}";
if (msg.Success != null)
{
msg.Success(jsonMessage);
}
else
{
outgoingMessage(Guid.Empty, string.Empty, jsonMessage, msg.RequestId);
}
}
private static bool readMessage(NetMQMessage message, DistributedAppMessage appMessage)
{
try
{
appMessage.Id = Guid.Parse(message.Pop().ConvertToString());
message.Pop();
appMessage.Method = message.Pop().ConvertToString();
message.Pop();
appMessage.Data = message.Pop().ConvertToString();
message.Pop();
appMessage.RequestId = Guid.Parse(message.Pop().ConvertToString());
}
catch
{
//td: what?
return(false);
}
return(true);
}
private void sendFailure(DistributedAppMessage msg, string message)
{
sendFailure(msg, new InvalidOperationException(message));
}