mirror of
https://github.com/CrowCpp/Crow.git
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266 lines
9.7 KiB
C++
266 lines
9.7 KiB
C++
#pragma once
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#include <chrono>
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#include <boost/date_time/posix_time/posix_time.hpp>
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#include <boost/asio.hpp>
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#ifdef CROW_ENABLE_SSL
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#include <boost/asio/ssl.hpp>
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#endif
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#include <cstdint>
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#include <atomic>
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#include <future>
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#include <vector>
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#include <memory>
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#include "crow/version.h"
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#include "crow/http_connection.h"
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#include "crow/logging.h"
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#include "crow/dumb_timer_queue.h"
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namespace crow
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{
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using namespace boost;
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using tcp = asio::ip::tcp;
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template <typename Handler, typename Adaptor = SocketAdaptor, typename ... Middlewares>
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class Server
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{
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public:
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Server(Handler* handler, std::string bindaddr, uint16_t port, std::string server_name = std::string("Crow/") + VERSION, std::tuple<Middlewares...>* middlewares = nullptr, uint16_t concurrency = 1, typename Adaptor::context* adaptor_ctx = nullptr)
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: acceptor_(io_service_, tcp::endpoint(boost::asio::ip::address::from_string(bindaddr), port)),
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signals_(io_service_),
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tick_timer_(io_service_),
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handler_(handler),
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concurrency_(concurrency == 0 ? 1 : concurrency),
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server_name_(server_name),
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port_(port),
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bindaddr_(bindaddr),
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middlewares_(middlewares),
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adaptor_ctx_(adaptor_ctx)
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{
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}
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void set_tick_function(std::chrono::milliseconds d, std::function<void()> f)
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{
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tick_interval_ = d;
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tick_function_ = f;
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}
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void on_tick()
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{
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tick_function_();
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tick_timer_.expires_from_now(boost::posix_time::milliseconds(tick_interval_.count()));
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tick_timer_.async_wait([this](const boost::system::error_code& ec)
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{
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if (ec)
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return;
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on_tick();
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});
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}
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void run()
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{
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for(int i = 0; i < concurrency_; i++)
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io_service_pool_.emplace_back(new boost::asio::io_service());
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get_cached_date_str_pool_.resize(concurrency_);
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timer_queue_pool_.resize(concurrency_);
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std::vector<std::future<void>> v;
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std::atomic<int> init_count(0);
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for(uint16_t i = 0; i < concurrency_; i ++)
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v.push_back(
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std::async(std::launch::async, [this, i, &init_count]{
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// thread local date string get function
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auto last = std::chrono::steady_clock::now();
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std::string date_str;
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auto update_date_str = [&]
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{
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auto last_time_t = time(0);
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tm my_tm;
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#if defined(_MSC_VER) || defined(__MINGW32__)
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gmtime_s(&my_tm, &last_time_t);
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#else
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gmtime_r(&last_time_t, &my_tm);
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#endif
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date_str.resize(100);
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size_t date_str_sz = strftime(&date_str[0], 99, "%a, %d %b %Y %H:%M:%S GMT", &my_tm);
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date_str.resize(date_str_sz);
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};
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update_date_str();
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get_cached_date_str_pool_[i] = [&]()->std::string
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{
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if (std::chrono::steady_clock::now() - last >= std::chrono::seconds(1))
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{
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last = std::chrono::steady_clock::now();
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update_date_str();
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}
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return date_str;
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};
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// initializing timer queue
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detail::dumb_timer_queue timer_queue;
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timer_queue_pool_[i] = &timer_queue;
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timer_queue.set_io_service(*io_service_pool_[i]);
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boost::asio::deadline_timer timer(*io_service_pool_[i]);
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timer.expires_from_now(boost::posix_time::seconds(1));
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std::function<void(const boost::system::error_code& ec)> handler;
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handler = [&](const boost::system::error_code& ec){
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if (ec)
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return;
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timer_queue.process();
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timer.expires_from_now(boost::posix_time::seconds(1));
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timer.async_wait(handler);
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};
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timer.async_wait(handler);
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init_count ++;
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while(1)
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{
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try
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{
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if (io_service_pool_[i]->run() == 0)
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{
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// when io_service.run returns 0, there are no more works to do.
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break;
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}
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} catch(std::exception& e)
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{
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CROW_LOG_ERROR << "Worker Crash: An uncaught exception occurred: " << e.what();
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}
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}
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}));
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if (tick_function_ && tick_interval_.count() > 0)
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{
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tick_timer_.expires_from_now(boost::posix_time::milliseconds(tick_interval_.count()));
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tick_timer_.async_wait([this](const boost::system::error_code& ec)
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{
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if (ec)
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return;
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on_tick();
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});
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}
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CROW_LOG_INFO << server_name_ << " server is running at " << bindaddr_ <<":" << acceptor_.local_endpoint().port()
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<< " using " << concurrency_ << " threads";
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CROW_LOG_INFO << "Call `app.loglevel(crow::LogLevel::Warning)` to hide Info level logs.";
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signals_.async_wait(
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[&](const boost::system::error_code& /*error*/, int /*signal_number*/){
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stop();
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});
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while(concurrency_ != init_count)
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std::this_thread::yield();
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do_accept();
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std::thread([this]{
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io_service_.run();
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CROW_LOG_INFO << "Exiting.";
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}).join();
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}
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void stop()
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{
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should_close_ = false; //Prevent the acceptor from taking new connections
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while (handler_->websocket_count.load(std::memory_order_release) != 0) //Wait for the websockets to close properly
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{
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}
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for(auto& io_service:io_service_pool_)
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{
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if (io_service != nullptr)
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{
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CROW_LOG_INFO << "Closing IO service " << &io_service;
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io_service->stop(); //Close all io_services (and HTTP connections)
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}
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}
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CROW_LOG_INFO << "Closing main IO service (" << &io_service_ << ')';
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io_service_.stop(); //Close main io_service
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}
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void signal_clear()
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{
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signals_.clear();
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}
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void signal_add(int signal_number)
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{
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signals_.add(signal_number);
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}
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private:
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asio::io_service& pick_io_service()
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{
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// TODO load balancing
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roundrobin_index_++;
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if (roundrobin_index_ >= io_service_pool_.size())
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roundrobin_index_ = 0;
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return *io_service_pool_[roundrobin_index_];
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}
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void do_accept()
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{
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asio::io_service& is = pick_io_service();
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auto p = new Connection<Adaptor, Handler, Middlewares...>(
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is, handler_, server_name_, middlewares_,
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get_cached_date_str_pool_[roundrobin_index_], *timer_queue_pool_[roundrobin_index_],
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adaptor_ctx_);
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if (!should_close_)
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{
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acceptor_.async_accept(p->socket(),
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[this, p, &is](boost::system::error_code ec)
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{
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if (!ec)
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{
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is.post([p]
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{
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p->start();
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});
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}
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else
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{
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delete p;
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}
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do_accept();
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});
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}
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}
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private:
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asio::io_service io_service_;
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std::vector<std::unique_ptr<asio::io_service>> io_service_pool_;
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std::vector<detail::dumb_timer_queue*> timer_queue_pool_;
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std::vector<std::function<std::string()>> get_cached_date_str_pool_;
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tcp::acceptor acceptor_;
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bool should_close_ = false;
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boost::asio::signal_set signals_;
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boost::asio::deadline_timer tick_timer_;
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Handler* handler_;
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uint16_t concurrency_{1};
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std::string server_name_;
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uint16_t port_;
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std::string bindaddr_;
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unsigned int roundrobin_index_{};
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std::chrono::milliseconds tick_interval_;
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std::function<void()> tick_function_;
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std::tuple<Middlewares...>* middlewares_;
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#ifdef CROW_ENABLE_SSL
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bool use_ssl_{false};
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boost::asio::ssl::context ssl_context_{boost::asio::ssl::context::sslv23};
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#endif
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typename Adaptor::context* adaptor_ctx_;
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};
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}
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