JSONSocket - Ruby server class snippet

gistfile1.rb

def initialize
   @server = TCPServer.new 19024
end

def start
   @server_thread = Thread.new do
      @client_thread = Thread.start(@server.accept) do |client|
         puts "server: Accepted client connection!"
         send_request(client, 'greeting', :message => 'Hello client!')
         receive_response(client)
         send_request(client, 'shutdown')
         receive_response(client)
         client.close
      end
   end
end

...

def send_request(client, command, args={})
   data = {'request' => {'command' => command}}
   data['request'].merge!(args)
   request = JSON.generate(data)
   client.print request
   if args[:message]
      puts "server: >> #{args[:message]}"
   end
end

def receive_response(client)
   response = client.recv(1024)
   data = JSON.parse(response)
   if data['response'] && data['response']['message']
      puts "server: << #{data['response']['message']}"
   end
   return data
end

JSONSocket - Qt JSON parsing and validation

QString Client::ProcessCommand(QScriptValue req)
{
    QScriptValue cmd = req.property("command");
    QString response;

    // Basic sanity check
    if (!cmd.isValid())
    {
        response = CommandErrorResponse("invalid", "No command specified");
    }

    // Process greeting
    else if (cmd.toString() == "greeting")
    {
        QScriptValue message = req.property("message");

        if (!message.isValid())
        {
            response = CommandErrorResponse("greeting", "No message specified");
        }
        else
        {
            response = CommandResponse("greeting", "Hello server. Hope things are well!");
        }
    }
...
}

JSONSocket - Qt QTcpSocket creation and wiring up

tcpSocket = new QTcpSocket(this);
...
Q_ASSERT(connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(ProcessRequest())));

JSONSocket - Qt receipt and parsing of JSON request

void Client::ProcessRequest(void)
{
    QByteArray request = tcpSocket->readAll();
    QScriptEngine engine;

    // Validate that the request was parsed and non-empty
    QScriptValue data = engine.evaluate("(" + QString(request) + ")");
...
}