httpcontext pointer is getting null whcih is causing crash.

[varma08420]

I have compiled all your examples from uSockets and ran all types of routes, which works perfectly fine.i have implemented almost same simple form of http server using App. i observed that for cases in which http body is received , in those cases while responding after processing the data, my application getting crashed at

#0 0x00000000004e9ed3 in us_socket_context_loop (ssl=1, context=0x0) at src/context.c:134
#1 0x000000000047cbdc in uWS::AsyncSocket::getLoopData (this=0x7f13037ef770)
at /data1/myhome/mahendrae/sib/SIB/genesys/GENESYS/genesysPF//third_party/uWS/include/AsyncSocket.h:86
#2 0x000000000047c26e in uWS::AsyncSocket::isCorked (this=0x7f13037ef770)
at /data1/myhome/mahendrae/sib/SIB/genesys/GENESYS/genesysPF//third_party/uWS/include/AsyncSocket.h:151
#3 0x000000000047ac6a in uWS::HttpResponse::cork(ofats::any_invocable<void ()>&&) (this=0x7f13037ef770, handler=...)
at /data1/myhome/mahendrae/sib/SIB/genesys/GENESYS/genesysPF//third_party/uWS/include/HttpResponse.h:498
#4 0x000000000047358c in RtLIX1Handler::rtSendRespToLim (this=0x2e83590, a_li_resp_data=..., ap_resp=0x7f13037ef770, ap_db_op_data=0x7f12e0090a30,
a_target_vector=std::vector of length 0, capacity 0)
at /data1/myhome/mahendrae/sib/SIB/APP/app_logic/code/LI/RtLIX1Handler/src/RtLIX1Handler.cpp:2488
#5 0x000000000047761f in RtLIX1Handler::rtHandleFileDumpResponse (this=0x2e83590, ap_resp_data=0x7f13037df710)
at /data1/myhome/mahendrae/sib/SIB/APP/app_logic/code/LI/RtLIX1Handler/src/RtLIX1Handler.cpp:3588
#6 0x000000000046d5ed in RtLIX1Handler::rtHandleTransactionRequest (this=0x2e83590, ap_http_req_data=0x7f13037ed320)
at /data1/myhome/mahendrae/sib/SIB/APP/app_logic/code/LI/RtLIX1Handler/src/RtLIX1Handler.cpp:1288
#7 0x0000000000480490 in RtLIHttpHandler::rtSendDataToWrkr (this=0x2e96330, ap_res=0x7f13037ef770,
ap_rest_req_data=0x7eefc0 RtLIHttpHandler::m_rest_req_data, a_data_size=355)
at /data1/myhome/mahendrae/sib/SIB/APP/app_logic/code/LI/RtLIHttpHandler/src/RtLIHttpHandler.cpp:627

i have been using single thread to receiving and responding back. i tried to run above case with ASAN to pin point the reason but it runs perfectly fine with asan compiled lib/bin. which made me clue less. from code i observed that when write function gets called context is retrived which returned as null. I have also used res->cork and in lamda i tried to write response back to client. i can also provide any futhure info if you require. i have used latest version 20.46. And also i observed that when i dont send body in cases where onData handler implemented then res pointer gets null by the time i respond back is this behavior expected??!!

Thanks

[uNetworkingAB]

You need to use onAborted and make sure you don't touch the HttpResponse after aborted

[varma08420]

I have also implemented onAborted call back but above crash occurs almost immediately..
onAborted gets invoked after 10 seconds in case of no response sent.so i dont think it is due to that reason.

  uWS::SSLApp({
 .key_file_name = "misc/key.pem",
 .cert_file_name = "misc/cert.pem",
 .passphrase = "1234"

}).get("/LI_REQUEST", &rtProcessHttpGETRequest).post("/LI_REQUEST",&rtProcessHttpPOSTRequest).del("/LI_REQUEST",&rtProcessHttpPOSTRequest).listen(
m_li_port, [&](auto *listen_socket) {
if (listen_socket) {
std::cout << "Listening on port " << m_li_port << std::endl;
}
}).run();

 void  RtLIHttpHandler::rtProcessHttpPOSTRequest(uWS::HttpResponse<true> *res, uWS::HttpRequest *req)

{
res->onData([&](std::string_view data, bool last) mutable
{

requestData.append(data.data(), data.length());

 if (last)
 {
     /* Use the data */
     std::cout << "We got all data, length: " << requestData.length() << std::endl;
     std::cout << "Recieved data="<<requestData<<std::endl;
     bzero(&m_static_buffer,RT_MAX_JSON_DATA);
     m_data_size = requestData.length();

     if((requestData.length() >0 ))
             snprintf(m_static_buffer,requestData.length(),"%s",requestData.c_str());
       //
	   //Processing of Data received in BODY

      res->cork([res,m_static_buffer](){
       std::cout <<" In Cork Lambda function"<<std::endl;
       res->write(m_static_buffer);
       res->end();

          });
     

    
          });

   res->onAborted([&]
   {
    cout<<"RtLIHttpHandler() :: rtProcessHttpPOSTRequest()::onAborted got invoked"<<endl;
    
   });

}

uWS_Crash.txt

[varma08420]

@uNetworkingAB any suggestions?