main.cpp

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#include "logging/Logger.hpp"
#include "metrics/ProcessMetrics.hpp"
#include "metrics/PrometheusServer.hpp"
#include "telnet/TelnetServer.hpp"
#include "utils/ConfigParser.hpp"
#include "utils/ErrorHelpers.hpp"
#include "utils/InputParser.hpp"
#include "utils/Tracer.hpp"
#include "zeromq/ZeroMQServer.hpp"
 
#include <curl/curl.h>
#include <spdlog/spdlog.h>
 
#include <csignal>
 
// SIGALRM interval in seconds
constexpr uintmax_t alarmInterval = 30;
 
namespace
{
    // Interruption flag
    // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
    volatile sig_atomic_t interruptFlag = 0;
 
    // Default SIGALRM function
    void alarmFunc(int /*unused*/)
    {
        alarm(alarmInterval);
 
        // Clear all flags
        std::for_each(vCheckFlag.begin(), vCheckFlag.end(), [](auto &entry) { entry.second->clear(); });
    }
 
    void interruptFunc(int /*unused*/) { interruptFlag = 1; }
} // namespace
 
int main(int argc, char **argv)
{
    const InputParser input(argc, argv);
    const ConfigParser config(input.cmdOptionExists("--config") ? input.getCmdOption("--config") : "config.json");
    const MainLogger logger(config.get("LOKI_ADDRESS"), config.get("SENTRY_ADDRESS"));
 
    // Initialize curl as soon as possible
    if (curl_global_init(CURL_GLOBAL_DEFAULT) < 0)
    {
        spdlog::critical("Can't init curl");
        return EXIT_FAILURE;
    }
 
    // Adjust log level
    if (input.cmdOptionExists("-v"))
    {
        spdlog::set_level(spdlog::level::info);
    }
    if (input.cmdOptionExists("-vv"))
    {
        spdlog::set_level(spdlog::level::debug);
    }
    if (input.cmdOptionExists("-vvv"))
    {
        spdlog::set_level(spdlog::level::trace);
    }
 
    // Log input arguments
    spdlog::debug("======== Detected input arguments ========");
    for (const auto &entry : input.getCmdOptions())
    {
        spdlog::debug("{} = {}", entry.first, entry.second);
    }
 
    // Log detected configuration to debug
    spdlog::debug("======== Detected configuration ========");
    for (const auto &entry : config.getConfigMap())
    {
        spdlog::debug("{} = {}", entry.first, entry.second);
    }
 
    // Register interrupt signal handler
    if (std::signal(SIGINT, interruptFunc) == SIG_ERR)
    {
        spdlog::critical("Can't set signal handler (SIGINT): {}", getErrnoString(errno));
        return EXIT_FAILURE;
    }
 
    // Register termination signal handler
    if (std::signal(SIGTERM, interruptFunc) == SIG_ERR)
    {
        spdlog::critical("Can't set signal handler (SIGTERM): {}", getErrnoString(errno));
        return EXIT_FAILURE;
    }
 
    // Register alarm signal handler
    if (std::signal(SIGALRM, alarmFunc) == SIG_ERR)
    {
        spdlog::critical("Can't set signal handler (SIGALRM): {}", getErrnoString(errno));
        return EXIT_FAILURE;
    }
    alarm(alarmInterval);
 
    // Initialize Crashpad handler
    std::unique_ptr<Tracer> crashpadController(nullptr);
    vCheckFlag.emplace_back("Crashpad Handler", std::make_shared<std::atomic_flag>(false));
    crashpadController = std::make_unique<Tracer>(
        vCheckFlag[vCheckFlag.size() - 1].second, config.get("CRASHPAD_REMOTE"), config.get("CRASHPAD_PROXY"),
        config.get("CRASHPAD_EXECUTABLE_PATH"), config.get("CRASHPAD_REPORT_DIR"));
 
    // Initialize Prometheus server
    std::unique_ptr<PrometheusServer> mainPrometheusServer(nullptr);
    const std::string prometheusAddr = input.getCmdOption("--enable-prometheus");
    if (!prometheusAddr.empty())
    {
        try
        {
            mainPrometheusServer = std::make_unique<PrometheusServer>(prometheusAddr);
            spdlog::info("Prometheus server start at {}", prometheusAddr);
        }
        catch (const std::exception &e)
        {
            spdlog::error("Can't start Prometheus Server: {}", e.what());
            return EXIT_FAILURE;
        }
    }
 
    // Initialize self monitoring
    std::unique_ptr<ProcessMetrics> selfMonitor(nullptr);
    vCheckFlag.emplace_back("Self Monitor", std::make_shared<std::atomic_flag>(false));
    if (mainPrometheusServer)
    {
        selfMonitor = std::make_unique<ProcessMetrics>(vCheckFlag[vCheckFlag.size() - 1].second,
                                                       mainPrometheusServer->createNewRegistry());
    }
 
    // Initialize ZeroMQ server
    std::unique_ptr<ZeroMQServer> zmqController(nullptr);
    vCheckFlag.emplace_back("ZeroMQ Server", std::make_shared<std::atomic_flag>(false));
    const std::string zeromqServerAddr = input.getCmdOption("--enable-zeromq");
    if (!zeromqServerAddr.empty())
    {
        try
        {
            zmqController = std::make_unique<ZeroMQServer>(
                zeromqServerAddr, vCheckFlag[vCheckFlag.size() - 1].second,
                mainPrometheusServer ? mainPrometheusServer->createNewRegistry() : nullptr);
            zmqController->messageCallback(ZeroMQServerMessageCallback);
            zmqController->initialise();
        }
        catch (const std::exception &e)
        {
            spdlog::error("Can't start ZeroMQ Server: {}", e.what());
            return EXIT_FAILURE;
        }
    }
 
    // Initialize Telnet server
    std::unique_ptr<TelnetServer> telnetController(nullptr);
    vCheckFlag.emplace_back("Telnet Server", std::make_shared<std::atomic_flag>(false));
    const unsigned long telnetPort =
        input.cmdOptionExists("--enable-telnet") ? std::stoul(input.getCmdOption("--enable-telnet")) : 0;
    if (telnetPort > 0 && telnetPort < 65536)
    {
        try
        {
            telnetController = std::make_unique<TelnetServer>();
            telnetController->connectedCallback(TelnetConnectedCallback);
            telnetController->newLineCallback(TelnetMessageCallback);
            telnetController->tabCallback(TelnetTabCallback);
            telnetController->initialise(telnetPort, vCheckFlag[vCheckFlag.size() - 1].second, "> ",
                                         mainPrometheusServer ? mainPrometheusServer->createNewRegistry() : nullptr);
        }
        catch (const std::exception &e)
        {
            spdlog::error("Can't start Telnet Server: {}", e.what());
            return EXIT_FAILURE;
        }
    }
    else if (telnetPort != 0)
    {
        spdlog::error("Invalid Telnet port: {}", telnetPort);
        return EXIT_FAILURE;
    }
 
    /* ################################################################################### */
    /* ############################# MAKE MODIFICATIONS HERE ############################# */
    /* ################################################################################### */
 
    /* ################################################################################### */
    /* ################################ END MODIFICATIONS ################################ */
    /* ################################################################################### */
 
    while (interruptFlag == 0)
    {
        std::this_thread::sleep_for(std::chrono::milliseconds(500));
    }
 
    /* ################################################################################### */
    /* ############################# MAKE MODIFICATIONS HERE ############################# */
    /* ################################################################################### */
 
    /* ################################################################################### */
    /* ################################ END MODIFICATIONS ################################ */
    /* ################################################################################### */
 
    curl_global_cleanup();
 
    return EXIT_SUCCESS;
}