inet_stream.cc

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/*
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Copyright (c) 2022, Stable Cloud Computing, Inc.
 
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
 
1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
 
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
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   this software without specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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*/
#include <gtest/gtest.h>
#include <system_error>
#include <future>
#include <sstream>
#include <chrono>
#include <thread>
 
#include <util/event.h>
#include <util/poller.h>
#include <net/inet.h>
#include <util/iostream.h>
#include <util/logger.h>
 
using std::cout;
using std::endl;
using std::string;
using std::stringstream;
using std::ios;
using scc::util::IoStream;
using scc::util::Logger;
using scc::util::Event;
using scc::util::Poller;
using scc::net::InetAddr;
using scc::net::InetTcpSock;
 
struct InetServerStreamTest : public testing::Test
{
    Event startev, quitev;
    InetTcpSock ssock, csock;
    InetAddr caddr, saddr;
    Logger log;
 
    InetServerStreamTest()
    {
        log.add_cout();
        log.max_line(2048);
        saddr.host("::");
        saddr.port(9876);
        ssock.reuse_addr(true);
        ssock.bind(saddr);
        caddr.host("::1");
        caddr.port(9876);
    }
    virtual ~InetServerStreamTest()
    {
    }
 
    static void set_all_polls(Poller& p, int fd)
    {
        p.set(fd, Poller::PollFlag::input|Poller::PollFlag::output|Poller::PollFlag::read_hup|Poller::PollFlag::priority);
    }
    static std::string str_polls(int ev)
    {
        stringstream s;
        if (ev & Poller::PollFlag::input)       s << " input";
        if (ev & Poller::PollFlag::output)      s << " output";
        if (ev & Poller::PollFlag::read_hup)    s << " read_hup";
        if (ev & Poller::PollFlag::priority)    s << " priority";
        if (ev & Poller::PollFlag::hup)         s << " hup";
        if (ev & Poller::PollFlag::error)       s << " error";
        return s.str();
    }
 
    static std::string server(InetTcpSock& sock, Event& start, Event& quit)
    {
        using scc::util::Poller;
        Logger log;
        log.add_cout();
        log.id("*serv*");
 
        stringstream s;
 
        try
        {
            sock.listen();
            log << "signal start" << endl;
            start.write(1);
 
            Poller p;
            p.set(quit, Poller::PollFlag::input);
            set_all_polls(p, sock);
 
            //sock.non_blocking(true);
            //error_code ec;
 
            log << "poll before accept" << endl;
            s << "*accept_poll:";
            while (1)
            {
                p.wait();
                if (p.event(quit))
                {
                    log << "quit event" << endl;
                    s << " quit";
                    return s.str();
                }
                
                int ev = p.event(sock);
                
                if (ev & ~Poller::PollFlag::output)
                {
                    cout << "sock events: " << str_polls(ev) << endl;
                    s << str_polls(ev);
                }
                
                if (ev & Poller::PollFlag::input)       break;
            }
 
            log << "calling accept" << endl;
            InetAddr from;
            auto conn = sock.accept(from);
            log << "connect from " << from << endl;
 
            IoStream st(conn, conn);
            st.exceptions(ios::failbit);        // throw on eof or bad
            try
            {
                set_all_polls(p, conn);
                while (1)
                {
                    s << " *conn_read_poll:";
                    while (1)
                    {
                        p.wait();
                        if (p.event(quit))
                        {
                            log << "quit event" << endl;
                            s << " quit";
                            return s.str();
                        }
 
                        int ev = p.event(conn);
                        if (ev & ~Poller::PollFlag::output)
                        {
                            cout << "conn events: " << str_polls(ev) << endl;
                            s << " *conn_ev:" << str_polls(ev);
                        }
 
                        if (ev & Poller::PollFlag::read_hup)
                        {
                            log << "connection sock peer hung up" << endl;
                            s << " *conn_peer_hup";
                            return s.str();
                        }
 
                        if (ev & Poller::PollFlag::input)       break;
                    }
 
                    log << "getline waiting" << endl;
                    string got;
                    if (!std::getline(st, got))
                    {
                        log << "getline returned failed" << endl;
                        s << " *getline_failed";
                        return s.str();
                    }
                    log << "got=" << got << endl;
 
                    s << " *conn_write_poll:";
                    while (1)
                    {
                        p.wait();
                        if (p.event(quit))
                        {
                            log << "quit event" << endl;
                            s << " quit";
                            return s.str();
                        }
 
                        int ev = p.event(conn);
                        if (ev & ~Poller::PollFlag::input)
                        {
                            cout << "conn events: " << str_polls(ev) << endl;
                            s << " *conn_ev:" << str_polls(ev);
                        }
 
                        if (ev & Poller::PollFlag::read_hup)
                        {
                            log << "connection sock peer hung up" << endl;
                            s << " *conn_peer_hup";
                            return s.str();
                        }
 
                        if (ev & Poller::PollFlag::output)      break;
                    }
 
                    st << got << endl;
                    if (got == "quit")
                    {
                        log << "getline stream got quit" << endl;
                        s << " *getline_quit";
                        return s.str();
                    }
                }
                log << "returned from stream loop" << endl;
                s << " *stream_loop_returned";
            }
            catch (const std::exception& e)
            {
                log << "stream exception: " << e.what() << endl;
 
                if (st.eof())
                {
                    log << "stream eof" << endl;
                    s << " *stream_eof";
                }
                if (st.bad())
                {
                    log << "stream eof" << endl;
                    s << " *stream_bad";
                }
                if (st.send_fail().size())
                {
                    log << "stream send failmsg=" << st.send_fail() << endl;
                    s << " *stream_send_fail=" << st.send_fail();
                }
                if (st.recv_fail().size())
                {
                    log << "stream recv failmsg=" << st.recv_fail() << endl;
                    s << " *stream_recv_fail=" << st.recv_fail();
                }
                return s.str();
            }
        }
        catch (const std::exception& e)
        {
            log << "pre-accept ex: " << e.what() << endl;
            start.write(1);
            return s.str()+" ex="+e.what();
        }
        start.write(1);
        return s.str();
    }
 
    void clientstart()
    {
        log << "wait for start" << endl;
        startev.read();
 
        //this_thread::sleep_for(chrono::milliseconds(100));
 
        log << "connect to " << endl;
        csock.connect(caddr);
    }
};
 
TEST_F(InetServerStreamTest, send_quit)
{
    log.id("send quit and recv");
 
    auto fut = async(server, std::ref(ssock), std::ref(startev), std::ref(quitev));
 
    clientstart();
 
    IoStream st(csock, csock);
 
    st << "quit" << endl;
    string got;
    getline(st, got);
    log << "got=" << got << endl;
 
    auto ret = fut.get();
    log << "server response: " << ret << endl;
}
 
TEST_F(InetServerStreamTest, reset)
{
    log.id("send recv and reset");
 
    auto fut = async(server, std::ref(ssock), std::ref(startev), std::ref(quitev));
 
    clientstart();
 
    csock.reset();
 
    auto ret = fut.get();
    log << "server response: " << ret << endl;
}
 
TEST_F(InetServerStreamTest, send_and_reset_clientsock)
{
    log.id("send recv and reset client socket");
 
    auto fut = async(server, std::ref(ssock), std::ref(startev), std::ref(quitev));
 
    clientstart();
 
    IoStream st(csock, csock);
 
    st << "don't quit" << endl;
    string got;
    getline(st, got);
    log << "got=" << got << endl;
 
    csock.reset();
 
    auto ret = fut.get();
    log << "server response: " << ret << endl;
}
 
TEST_F(InetServerStreamTest, quit)
{
    log.id("send recv and reset");
 
    auto fut = async(server, std::ref(ssock), std::ref(startev), std::ref(quitev));
 
    log << "wait for start" << endl;
    startev.read();
 
    quitev.write(1);
 
    auto ret = fut.get();
    log << "server response: " << ret << endl;
}