/// <summary>
/// Opens the websocket connection and sends the CONNECT message.
/// </summary>
/// <returns><System.Boolean> true if successful.</returns>
public async Task <bool> ConnectAsync(Action <string> errorsEventHandler)
{
const string WEBSOCKETPATH = "/w/messages/websocket"; // Based on https://docs.nem.io/en/nem-dev-basics-docker/blockchain-monitoring
await ClientWs.ConnectAsync(new Uri(string.Concat("ws://", Domain, ":", Port, WEBSOCKETPATH)), CancellationToken.None);
if (ClientWs.State != WebSocketState.Open)
{
return(false);
}
// Send CONNECT
StompMessage connect = new StompMessage(StompMessage.ClientCommands.CONNECT);
// Set message headers, might not be needed
//connect["accept-version"] = "1.1,1.0";
//connect["heart-beat"] = "10000, 10000"; // out, in
await SendAsync(connect);
// Read the answer from the server
StompMessage connectedMsg = StompMessage.Deserialize(await ReadSocketAsync());
if (connectedMsg.Command != StompMessage.ServerResponses.CONNECTED)
{
return(false);
}
// Subscribe to errors channel
await SubscribeToErrorsAsync(errorsEventHandler);
// Start the Loop to read answers
Task loop = LoopReadStompMsgsAsync(); // Explicitely not using await, to allow the Loop to run asynchronously without waiting for it to complete!
return(true);
}
/// <summary>
/// Loop to read Stomp messages from the websocket and call appropriate actions.
/// </summary>
private async Task LoopReadStompMsgsAsync()
{
while (ClientWs.State == WebSocketState.Open) // Infinite loop for as long as we are running with an open socket
{
var msg = await ReadSocketAsync();
StompMessage stompMsg = StompMessage.Deserialize(msg);
switch (stompMsg.Command)
{
case StompMessage.ServerResponses.ERROR:
this.OnErrorEventHandler?.Invoke(stompMsg.Body);
break;
case StompMessage.ServerResponses.MESSAGE:
ProcessReceivedMessage(stompMsg.GetDestination(), stompMsg.Body);
break;
default:
// throw exception?
Debug.WriteLine("Received STOMP Message with an unsupported Command: " + stompMsg);
break;
}
}
}