tcp client disconnection

[sancelot]

Hi,
Using a tcp rpc client connection there seems being a disconnection after a while, if we don't send commands.

the call() replies with not connected

Is there an automatic disconnect ? That was the first problem.

I have tried using jcon client with many python json tcp servers. unfortunately most of them are not able to reliably communicate with jcon !!!!!

Finally I found this working API : https://github.com/joshmarshall/jsonrpctcp

It works , BUT... It is not possible to send 2 calls without disconnecting the client from the server and initiating a new connection.

The code for client side is :

int main(int argc, char* argv[])
{
    QCoreApplication app(argc, argv);

    {
        auto rpc_client = startClient(&app, SocketType::tcp);
	auto result = rpc_client->call("AppendProd","Production",1,32);
        if (result->isSuccess()) {
           qDebug() << "result of synchronous RPC call:" << result->result();
       } else {
         qDebug() << "RPC error:" << result->toString();
      }  
       result = rpc_client->call("AppendProd","Prduction",1,325);
      if (result->isSuccess()) {
        qDebug() << "result of synchronous RPC call:" << result->result();
       } else {
        qDebug() << "RPC error:" << result->toString();
      }

    }
}

the python code for server side is :

from jsonrpctcp.server import Server
from jsonrpctcp import config
from jsonrpctcp import logger
import thread,threading

def AppendProd(type_,m,n):
    print "type",type_,m,n
    return ("Hello",10,11,12,True)

server=Server(('localhost',6002))

import logging
config.verbose = True
logger.addHandler(logging.StreamHandler())
logger.setLevel(logging.DEBUG)
       

server.add_handler(AppendProd)
server_thread = threading.Thread(target=server.serve)
server_thread.daemon = True
server_thread.start()

import time
while True:
    time.sleep(0.5)

What is the way to log on the jconcpp side ? There is a jcon_client_log.txt file generated, but is empty !

[joncol]

Can you create a minimal example where you demonstrate the problems with connections automatically going down? It could be a result of the server automatically closing the socket. There should be no such mechanism in the client code.

There's a JsonRpcFileLogger class which logs to file. I'm not sure what your question is regarding the logging.

[sancelot]

I tried the same thing using the jconcpp server usi ng 2 distincts program, I have not found the problem with needing to disconnect before sending new call request.

I checked server side in the jsonrpctcp api , and it closes the socket with each request !
(https://github.com/joshmarshall/jsonrpctcp/blob/master/jsonrpctcp/server.py#L195) so, connecting again is mandatory . But on jconcpp client in this case , I don't seem to have the notification of socket closed