libt2n: (tomj) fix mysterious crashes in test::ReentrantServer: boost serialization...

[libt2n] / test / reentrant.cpp

/***************************************************************************
 *   Copyright (C) 2004 by Intra2net AG                                    *
 *   info@intra2net.com                                                    *
 *                                                                         *
 ***************************************************************************/

#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>

#include <iostream>
#include <string>
#include <sstream>
#include <stdexcept>

#include <cppunit/extensions/TestFactoryRegistry.h>
#include <cppunit/ui/text/TestRunner.h>
#include <cppunit/extensions/HelperMacros.h>

#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>
#include <boost/archive/xml_oarchive.hpp>
#include <boost/archive/xml_iarchive.hpp>
#include <boost/serialization/serialization.hpp>

#include <container.hxx>
#include <socket_client.hxx>
#include <socket_server.hxx>
#include <command_client.hxx>
#include <command_server.hxx>

using namespace std;
using namespace CppUnit;
using namespace libt2n;

namespace reentrant
{

command_server *global_server = NULL;

int fork_count = 3;
int requests_per_child = 100;
int all_requests = (2 << (fork_count-1)) * requests_per_child;

int seen_client_requests = 0;

string testfunc(const string& str)
{
    string ret;
    ret=str+", testfunc() was here";

    // call handle, eventually reentrant
    if (global_server)
        global_server->handle(10000);

    ++seen_client_requests;

    return ret;
}

class testfunc_res : public libt2n::result
{
    private:
        string res;

        friend class boost::serialization::access;
        template<class Archive>
        void serialize(Archive & ar, const unsigned int version)
        {
            ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(libt2n::result);
            ar & BOOST_SERIALIZATION_NVP(res);
        }

    public:
        testfunc_res()
            {
            }

        testfunc_res(const string& str)
        {
            res=str;
        }

        string get_data()
        {
            return res;
        }
};


class testfunc_cmd : public libt2n::command
{
    private:
        string param;

        friend class boost::serialization::access;
        template<class Archive>
        void serialize(Archive & ar, const unsigned int version)
        {
            ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(libt2n::command);
            ar & BOOST_SERIALIZATION_NVP(param);
        }

    public:
        testfunc_cmd()
            {
            }

        testfunc_cmd(const string& str)
        {
            param=str;
        }

        libt2n::result* operator()()
        {
            return new testfunc_res(testfunc(param));
        }
};

}


#include <boost/serialization/export.hpp>

BOOST_CLASS_EXPORT(reentrant::testfunc_cmd)
BOOST_CLASS_EXPORT(reentrant::testfunc_res)

using namespace reentrant;

class test_reentrant : public TestFixture
{
    CPPUNIT_TEST_SUITE(test_reentrant);

    CPPUNIT_TEST(ReentrantServer);

    CPPUNIT_TEST_SUITE_END();

    public:

    void setUp()
    { }

    void tearDown()
    { }

    void ReentrantServer()
    {
        switch(fork())
        {
            case -1:
            {
                CPPUNIT_FAIL("fork error");
                break;
            }
            case 0:
            // child
            {
                // wait till server is up
                sleep(2);

                // hammer the server
                for (int i = 0; i < fork_count; i++)
                    fork();

                try
                {
                    for (int i=0; i < requests_per_child; i++)
                    {
                        socket_client_connection sc("./socket");
                        // sc.set_logging(&cerr,debug);
                        command_client cc(&sc);

                        result_container rc;
                        cc.send_command(new testfunc_cmd("hello"),rc);

                        testfunc_res *res = dynamic_cast<testfunc_res*>(rc.get_result());
                        if (res)
                        {
                            string ret = res->get_data();
                            if (ret != "hello, testfunc() was here")
                                std::cout << "ERROR reentrant server testfunc_res failed, res: \"" << ret << "\"\n";
                        }
                        else
                        {
                            std::cout << "ERROR result from reentrant server empty (" << rc.get_result() << ")\n";
                        }
                    }
                } catch (exception &e)
                {
                    cerr << "caught exception: " << e.what() << endl;
                } catch(...)
                {
                    std::cerr << "exception in child. ignoring\n";
                }

                // don't call atexit and stuff
                _exit(0);
            }

            default:
            // parent
            {
                // don't kill us on broken pipe
                signal(SIGPIPE, SIG_IGN);

                socket_server ss("./socket");
                command_server cs(ss);

                global_server=&cs;

                // Wait until all requests have successed
                int safety_check = 0;
                while (seen_client_requests < all_requests)
                {
                    ++safety_check;
                    if (safety_check > 10) {
                        std::cerr << "reached safety check, aborting.\n";
                        break;
                    }

                    long long maxtime=1000000;
                    while(maxtime > 0)
                        cs.handle(maxtime,&maxtime);
                }

                global_server = NULL;
            }

            // we are still alive, everything is ok
            CPPUNIT_ASSERT_EQUAL(all_requests, seen_client_requests);
        }
    }

};


CPPUNIT_TEST_SUITE_REGISTRATION(test_reentrant);