/// <summary>
/// Process a PLC request and return a PLC response.
/// </summary>
/// <param name="request">Request received from network.</param>
/// <returns>Response to be sent back to the client.</returns>
public PLCResponse Handle(PLCRequest request)
{
switch (request.Command)
{
case PLCRequest.CommandPing:
return(new PLCResponse {
});
case PLCRequest.CommandRead:
Dictionary <string, object> values = null;
if (request.Keys != null && request.Keys.Length > 0)
{
values = this.memory.Read(request.Keys);
}
return(new PLCResponse {
Values = values
});
case PLCRequest.CommandWrite:
if (request.Values != null && request.Values.Count > 0)
{
this.memory.Write(request.Values);
}
return(new PLCResponse {
});
default:
throw new PLCInvalidCommandException(String.Format("Command {0} is unknown.", request.Command));
}
}
private void _RecvAndSend(ResponseSocket socket)
{
string received = socket.ReceiveFrameString(System.Text.Encoding.UTF8);
PLCResponse response = null;
try
{
// ask service to handle request
PLCRequest request = JsonConvert.DeserializeObject <PLCRequest>(received, jsonSettings);
response = this.service.Handle(request);
}
catch (PLCService.PLCServiceException e)
{
// reply with an error
response = new PLCResponse
{
Error = new PLCResponse.PLCError {
Type = e.Code, Desc = e.Message
},
};
}
catch (System.Exception e)
{
// reply with an error
response = new PLCResponse
{
Error = new PLCResponse.PLCError {
Type = "unkown", Desc = e.Message
},
};
}
// serialize to json and send
if (response == null)
{
response = new PLCResponse();
}
string serialized = JsonConvert.SerializeObject(response, Formatting.None, jsonSettings);
socket.SendFrame(System.Text.Encoding.UTF8.GetBytes(serialized));
}