clio/websocket_server_async.cpp

//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//

//------------------------------------------------------------------------------
//
// Example: WebSocket server, asynchronous
//
//------------------------------------------------------------------------------

#include <boost/asio/dispatch.hpp>
#include <boost/asio/strand.hpp>
#include <boost/beast/core.hpp>
#include <boost/beast/websocket.hpp>
#include <boost/json.hpp>

#include <boost/log/core.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/trivial.hpp>
#include <algorithm>
#include <cstdlib>
#include <fstream>
#include <functional>
#include <iostream>
#include <memory>
#include <reporting/ReportingETL.h>
#include <reporting/server/session.h>
#include <reporting/server/listener.h>
#include <sstream>
#include <string>
#include <thread>
#include <vector>

std::optional<boost::json::object>
parse_config(const char* filename)
{
    try
    {
        std::ifstream in(filename, std::ios::in | std::ios::binary);
        if (in)
        {
            std::stringstream contents;
            contents << in.rdbuf();
            in.close();
            std::cout << contents.str() << std::endl;
            boost::json::value value = boost::json::parse(contents.str());
            return value.as_object();
        }
    }
    catch (std::exception const& e)
    {
        std::cout << e.what() << std::endl;
    }
    return {};
}
//------------------------------------------------------------------------------
//
void
initLogLevel(int level)
{
    switch (level)
    {
        case 0:
            boost::log::core::get()->set_filter(
                boost::log::trivial::severity >= boost::log::trivial::trace);
            break;
        case 1:
            boost::log::core::get()->set_filter(
                boost::log::trivial::severity >= boost::log::trivial::debug);
            break;
        case 2:
            boost::log::core::get()->set_filter(
                boost::log::trivial::severity >= boost::log::trivial::info);
            break;
        case 3:
            boost::log::core::get()->set_filter(
                boost::log::trivial::severity >= boost::log::trivial::warning);
            break;
        case 4:
            boost::log::core::get()->set_filter(
                boost::log::trivial::severity >= boost::log::trivial::error);
            break;
        case 5:
            boost::log::core::get()->set_filter(
                boost::log::trivial::severity >= boost::log::trivial::fatal);
            break;
        default:
            boost::log::core::get()->set_filter(
                boost::log::trivial::severity >= boost::log::trivial::info);
    }
}

int
main(int argc, char* argv[])
{
    // Check command line arguments.
    if (argc != 5 and argc != 6)
    {
        std::cerr
            << "Usage: websocket-server-async <address> <port> <threads> "
               "<config_file> <log level> \n"
            << "Example:\n"
            << "    websocket-server-async 0.0.0.0 8080 1 config.json 2\n";
        return EXIT_FAILURE;
    }
    auto const address = boost::asio::ip::make_address(argv[1]);
    auto const port = static_cast<unsigned short>(std::atoi(argv[2]));
    auto const threads = std::max<int>(1, std::atoi(argv[3]));
    auto const config = parse_config(argv[4]);
    if (argc > 5)
    {
        initLogLevel(std::atoi(argv[5]));
    }
    else
    {
        initLogLevel(2);
    }
    if (!config)
    {
        std::cerr << "couldnt parse config. Exiting..." << std::endl;
        return EXIT_FAILURE;
    }

    // The io_context is required for all I/O
    boost::asio::io_context ioc{threads};
    ReportingETL etl{config.value(), ioc};

    // Create and launch a listening port
    std::make_shared<listener>(
        ioc,
        boost::asio::ip::tcp::endpoint{address, port},
        etl.getSubscriptionManager(),
        etl.getFlatMapBackend())
        ->run();

    // Run the I/O service on the requested number of threads
    std::vector<std::thread> v;
    v.reserve(threads - 1);
    for (auto i = threads - 1; i > 0; --i)
        v.emplace_back([&ioc] { ioc.run(); });
    std::cout << "created ETL" << std::endl;
    etl.run();
    std::cout << "running ETL" << std::endl;
    ioc.run();

    return EXIT_SUCCESS;
}