unix.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:
 
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   this list of conditions and the following disclaimer in the documentation
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   this software without specific prior written permission.
 
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#include <net/unix.h>
#include <gtest/gtest.h>
#include <iostream>
#include <system_error>
#include <cerrno>
#include <thread>
#include <future>
#include <sstream>
#include <util/event.h>
#include <util/poller.h>
#include <net/inet.h>
#include <util/iostream.h>
#include <util/fs.h>
#include <util/logger.h>
 
using std::cout;
using std::endl;
using std::string;
using std::async;
using std::stringstream;
using scc::util::IoStream;
using scc::util::Logger;
using scc::util::Event;
using scc::util::Poller;
using scc::net::UnixAddr;
using scc::net::UnixTcpSock;
using scc::net::UnixUdpSock;
 
std::string server_addrname("/tmp/server.sock");
std::string client_addrname("/tmp/client.sock");
 
struct unix_networking : public testing::Test
{
    std::string snd, got, testgot;
    scc::util::Logger log;
    UnixAddr server_addr, client_addr;
    scc::util::Event startev, quitev;
 
    unix_networking() : snd("this is a test line\nthis is the second\nanother\n\nlast one")
    {
        Logger log;
        log.add_cout();
        log.id("test");
 
        std::system_error err;
        scc::util::Filesystem::remove(server_addrname, &err);
        server_addr.host(server_addrname);
        scc::util::Filesystem::remove(client_addrname, &err);
        client_addr.host(client_addrname);
    }
    virtual ~unix_networking()
    {
        std::system_error err;
        scc::util::Filesystem::remove(server_addrname, &err);
        scc::util::Filesystem::remove(client_addrname, &err);
    }
 
    void tcp_stream_test(UnixTcpSock& sock)
    {
        Logger log;
        log.add_cout();
        log.id("unix tcp stream client");
 
        IoStream stream(sock, sock);
        stringstream testst(snd);
 
        // first send and recieve using getline
 
        log << "sending " << snd.size() << endl;
        ASSERT_TRUE(stream << snd << endl);
        stream.flush();
 
        while (std::getline(testst, testgot))
        {
            ASSERT_TRUE(std::getline(stream, got));
            log << "got reply " << got.size() << endl;
            ASSERT_EQ(got, testgot);
        }
 
        // now send and receive using stream operators
 
        ASSERT_TRUE(stream << snd << endl);
        stream.flush();
 
        stringstream testst2(snd);
        while (testst2 >> testgot)
        {
            ASSERT_TRUE(stream >> got);
            log << "got reply " << got.size() << endl;
            ASSERT_EQ(got, testgot);
        }
 
        log << "tcp_stream_test: end" << endl;
    }
 
    void tcp_writeread_test(UnixTcpSock& sock)
    {
        Logger log;
        log.add_cout();
        log.id("unix tcp readwrite client");
 
        log << "sending " << snd.size() << endl;
        ASSERT_EQ(sock.send(snd.data(), snd.size()), snd.size());
 
        char buf[snd.size()];
        size_t sz = 0, got;
        do
        {
            got = sock.recv(buf+sz, snd.size()-sz);
            log << "got reply " << got << endl;
            ASSERT_GT(got, 0);
            sz += got;
        }
        while (sz < snd.size());
        ASSERT_EQ(sz, snd.size());
        ASSERT_EQ(memcmp(buf, snd.data(), sz), 0);
 
        log << "end" << endl;
    }
 
    void udp_writeread_test(UnixUdpSock& sock, UnixAddr& addr)
    {
        Logger log;
        log.add_cout();
        log.id("unix udp client");
 
        log << "sending " << snd.size() << " to " << addr.str() << endl;
        ASSERT_EQ(sock.send(snd.data(), snd.size(), addr), snd.size());
 
        char buf[snd.size()];
        size_t got;
        UnixAddr from;
        got = sock.recv(buf, snd.size(), from);
        log << "got reply " << got << " from " << from.host() << endl;
        ASSERT_EQ(got, snd.size());
        ASSERT_EQ(memcmp(buf, snd.data(), snd.size()), 0);
 
        log << "end" << endl;
    }
 
    static int udp_readwrite_server(Event& startev, UnixUdpSock& sock, UnixAddr& addr, UnixAddr& from, Event& quitev)
    {
        Logger log;
        log.add_cout();
        log.id("unix udp server");
 
        try
        {
            log << "reuse_addr" << endl;
            sock.reuse_addr(true);
            log << "bind to " << addr.host() << endl;
            sock.bind(addr);
 
            startev.write(1);       // signal the other thread it can start
 
            // now poll to see when we have new data (or are signalled to quit)
            Poller pin;
            pin.set(sock.fd(), Poller::input);
            pin.set(quitev.fd(), Poller::input);
 
            while (1)
            {
                pin.wait();
                if (pin.event(quitev.fd()))
                {
                    startev.write(1);   // no blocking allowed
                    return 0;
                }
                else if (pin.event(sock.fd()))
                {
                    auto sz = sock.recv_next();  // how many bytes are waiting?
                    char buf[sz];
                    sock.recv(buf, sz, from);
                    log << "got " << sz << " from " << from.host() << endl;
                    sock.send(buf, sz, from);
                }
            }
        }
        catch (const std::exception& e)
        {
            log << "exception: " << e.what() << endl;
            startev.write(1);   // no blocking allowed
            return errno;
        }
        startev.write(1);   // no blocking allowed
        return 0;
    }
 
    static int tcp_iostream_server(Event& startev, UnixTcpSock& sock, UnixAddr& addr, UnixAddr& from)
    {
        Logger log;
        log.add_cout();
        log.id("unix tcp stream server");
 
        try
        {
            log << "reuse_addr" << endl;
            sock.reuse_addr(true);
            log << "bind to " << addr.host() << endl;
            sock.bind(addr);
            log << "listen" << endl;
            sock.listen();
 
            startev.write(1);       // signal the other thread it can start
 
            auto conn = sock.accept(from);
            log << "connect from " << from << endl;
 
            IoStream stream(conn, conn);
 
            for (string got; std::getline(stream, got);)     // loop until eof (socket closed)
            {
                log << "got " << got.size() << endl;
                stream << got << endl;
            }
 
        }
        catch (const std::exception& e)
        {
            log << "exception: " << e.what() << endl;
            startev.write(1);   // no blocking allowed
            return errno;
        }
        startev.write(1);   // no blocking allowed
        return 0;
    }
 
    static int tcp_readwrite_server(Event& startev, UnixTcpSock& sock, UnixAddr& addr, UnixAddr& from)
    {
        Logger log;
        log.add_cout();
        log.id("unix tcp readwrite server");
 
        try
        {
            log << "reuse_addr" << endl;
            sock.reuse_addr(true);
            log << "bind to " << addr.host() << endl;
            sock.bind(addr);
            log << "listen" << endl;
            sock.listen();
 
            startev.write(1);       // signal the other thread it can start
 
            auto conn = sock.accept(from);
            log << "connect from " << from << endl;
 
            char buf[16];
            int sz;
            while ((sz = conn.recv(buf, 16)) > 0)       // loop until we get 0 (socket closed)
            {
                log << "got " << sz << endl;
                conn.send(buf, sz);
            }
        }
        catch (const std::exception& e)
        {
            log << "exception: " << e.what() << endl;
            startev.write(1);                           // make sure we don't block
            return errno;
        }
        startev.write(1);
        return 0;
    }
};
 
TEST_F(unix_networking, addrnames)
{
    ASSERT_EQ(server_addr.host(), server_addrname);
    ASSERT_EQ(client_addr.host(), client_addrname);
}
 
TEST_F(unix_networking, udp_readwrite)
{
    UnixUdpSock servsock;
    UnixAddr from;
    
    auto fut = async(udp_readwrite_server, std::ref(startev), std::ref(servsock), std::ref(server_addr), std::ref(from), std::ref(quitev));
 
    startev.read();   // wait for the server to listen
 
    UnixUdpSock sock;
 
    // bind to receive replies
    log << "binding to " << client_addr << endl;
    sock.bind(client_addr); 
 
    udp_writeread_test(sock, server_addr);
 
    quitev.write(1);        // signal server to quit (we don't have a connection)
    
    int res = fut.get();
    log << "return code: " << res << endl;
    
    ASSERT_EQ(res, 0);
    ASSERT_EQ(from.host(), client_addr.host());
}
 
TEST_F(unix_networking, tcp_iostream)
{
    UnixTcpSock servsock;
 
    UnixAddr from;
    auto fut = async(tcp_iostream_server, std::ref(startev), std::ref(servsock), std::ref(server_addr), std::ref(from));
 
    startev.read();
 
    UnixTcpSock sock;
 
    // binding will allow the server to see our "address"; it is optional for connected protocol
    log << "binding to " << client_addr << endl;
    sock.bind(client_addr);
 
    log << "connect" << endl;
    sock.connect(server_addr);
 
    log << "connected to addr name=" << server_addr.host() << endl;
 
    tcp_stream_test(sock);
 
    sock.close();       // close the socket to shut down the remote server connection
    
    int res = fut.get();
    log << "return code: " << res << endl;
    
    ASSERT_EQ(res, 0);
    ASSERT_EQ(from.host(), client_addr.host());
}
 
TEST_F(unix_networking, tcp_readwrite)
{
    UnixTcpSock servsock;
    UnixAddr from;
 
    auto fut = async(tcp_readwrite_server, std::ref(startev), std::ref(servsock), std::ref(server_addr), std::ref(from));
 
    startev.read();
 
    UnixTcpSock sock;
 
    log << "binding to " << client_addr << endl;
    sock.bind(client_addr);
 
    log << "connect" << endl;
    sock.connect(server_addr);
 
    log << "connected to addr name=" << server_addr.host() << endl;
 
    tcp_writeread_test(sock);
 
    sock.close();
    int res = fut.get();
    log << "return code: " << res << endl;
    ASSERT_EQ(res, 0);
    ASSERT_EQ(from.host(), client_addr.host());
}