CrowCpp / Crow / 809

Committed 10 Oct 2025 12:30AM UTC coverage: 87.336% (-0.2%) from 87.511%

Build # 809

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push

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Committed by

web-flow

Commit Message

Merge pull request #1101 from autoantwort/feature-websocket-response

websockets: Allow sending a response when rejecting a websocket request (Closes #1097)

Coverage Stats

54 of 100 new or added lines in 4 files covered. (54.0%)

7 existing lines in 2 files now uncovered.

4117 of 4714 relevant lines covered (87.34%)

134.86 hits per line

Source File
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76.16

/include/crow/http_server.h

#pragma once

#ifdef CROW_USE_BOOST
#include <boost/asio.hpp>
#ifdef CROW_ENABLE_SSL
#include <boost/asio/ssl.hpp>
#endif
#else
#ifndef ASIO_STANDALONE
#define ASIO_STANDALONE
#endif
#include <asio.hpp>
#ifdef CROW_ENABLE_SSL
#include <asio/ssl.hpp>
#endif
#endif

#include <atomic>
#include <chrono>
#include <cstdint>
#include <future>
#include <memory>
#include <thread>
#include <vector>

#include "crow/version.h"
#include "crow/http_connection.h"
#include "crow/logging.h"
#include "crow/task_timer.h"
#include "crow/socket_acceptors.h"


namespace crow // NOTE: Already documented in "crow/app.h"
{
#ifdef CROW_USE_BOOST
    namespace asio = boost::asio;
    using error_code = boost::system::error_code;
#else
    using error_code = asio::error_code;
#endif
    using tcp = asio::ip::tcp;
    using stream_protocol = asio::local::stream_protocol;

    template<typename Handler, typename Acceptor = TCPAcceptor, typename Adaptor = SocketAdaptor, typename... Middlewares>
    class Server
    {
    public:
      Server(Handler* handler,
             typename Acceptor::endpoint endpoint, 
             std::string server_name = std::string("Crow/") + VERSION,
             std::tuple<Middlewares...>* middlewares = nullptr,
             unsigned int concurrency = 1,
             uint8_t timeout = 5,
             typename Adaptor::context* adaptor_ctx = nullptr):
          concurrency_(concurrency),
          task_queue_length_pool_(concurrency_ - 1),
          acceptor_(io_context_),
          signals_(io_context_),
          tick_timer_(io_context_),
          handler_(handler),
          timeout_(timeout),
          server_name_(server_name),
          middlewares_(middlewares),
          adaptor_ctx_(adaptor_ctx)
        {
            if (startup_failed_) {
                CROW_LOG_ERROR << "Startup failed; not running server.";
                return;
            }

            error_code ec;

            acceptor_.raw_acceptor().open(endpoint.protocol(), ec);
            if (ec) {
                CROW_LOG_ERROR << "Failed to open acceptor: " << ec.message();
                startup_failed_ = true;
                return;
            }

            acceptor_.raw_acceptor().set_option(Acceptor::reuse_address_option(), ec);
            if (ec) {
                CROW_LOG_ERROR << "Failed to set socket option: " << ec.message();
                startup_failed_ = true;
                return;
            }

            acceptor_.raw_acceptor().bind(endpoint, ec);
            if (ec) {
                CROW_LOG_ERROR << "Failed to bind to " << acceptor_.address()
                            << ":" << acceptor_.port() << " - " << ec.message();
                startup_failed_ = true;
                return;
            }

            acceptor_.raw_acceptor().listen(tcp::acceptor::max_listen_connections, ec);
            if (ec) {
                CROW_LOG_ERROR << "Failed to listen on port: " << ec.message();
                startup_failed_ = true;
                return;
            }


        }

        void set_tick_function(std::chrono::milliseconds d, std::function<void()> f)
        {
            tick_interval_ = d;
            tick_function_ = f;
        }

        void on_tick()
        {
            tick_function_();
            tick_timer_.expires_after(std::chrono::milliseconds(tick_interval_.count()));
            tick_timer_.async_wait([this](const error_code& ec) {
                if (ec)
                    return;
                on_tick();
            });
        }

        void run()
        {

            if (startup_failed_) {
                CROW_LOG_ERROR << "Server startup failed. Aborting run().";
                return;
            }

            uint16_t worker_thread_count = concurrency_ - 1;
            for (int i = 0; i < worker_thread_count; i++)
                io_context_pool_.emplace_back(new asio::io_context());
            get_cached_date_str_pool_.resize(worker_thread_count);
            task_timer_pool_.resize(worker_thread_count);

            std::vector<std::future<void>> v;
            std::atomic<int> init_count(0);
            for (uint16_t i = 0; i < worker_thread_count; i++)
                v.push_back(
                  std::async(
                    std::launch::async, [this, i, &init_count] {
                        // thread local date string get function
                        auto last = std::chrono::steady_clock::now();

                        std::string date_str;
                        auto update_date_str = [&] {
                            auto last_time_t = time(0);
                            tm my_tm;

#if defined(_MSC_VER) || defined(__MINGW32__)
                            gmtime_s(&my_tm, &last_time_t);
#else
                            gmtime_r(&last_time_t, &my_tm);
#endif
                            date_str.resize(100);
                            size_t date_str_sz = strftime(&date_str[0], 99, "%a, %d %b %Y %H:%M:%S GMT", &my_tm);
                            date_str.resize(date_str_sz);
                        };
                        update_date_str();
                        get_cached_date_str_pool_[i] = [&]() -> std::string {
                            if (std::chrono::steady_clock::now() - last >= std::chrono::seconds(1))
                            {
                                last = std::chrono::steady_clock::now();
                                update_date_str();
                            }
                            return date_str;
                        };

                        // initializing task timers
                        detail::task_timer task_timer(*io_context_pool_[i]);
                        task_timer.set_default_timeout(timeout_);
                        task_timer_pool_[i] = &task_timer;
                        task_queue_length_pool_[i] = 0;

                        init_count++;
                        while (1)
                        {
                            try
                            {
                                if (io_context_pool_[i]->run() == 0)
                                {
                                    // when io_service.run returns 0, there are no more works to do.
                                    break;
                                }
                            }
                            catch (std::exception& e)
                            {
                                CROW_LOG_ERROR << "Worker Crash: An uncaught exception occurred: " << e.what();
                            }
                        }
                    }));

            if (tick_function_ && tick_interval_.count() > 0)
            {
                tick_timer_.expires_after(std::chrono::milliseconds(tick_interval_.count()));
                tick_timer_.async_wait(
                  [this](const error_code& ec) {
                      if (ec)
                          return;
                      on_tick();
                  });
            }
            handler_->port(acceptor_.port());
            handler_->address_is_bound();
            CROW_LOG_INFO << server_name_ 
                          << " server is running at " << acceptor_.url_display(handler_->ssl_used()) 
                          << " using " << concurrency_ << " threads";
            CROW_LOG_INFO << "Call `app.loglevel(crow::LogLevel::Warning)` to hide Info level logs.";

            signals_.async_wait(
              [&](const error_code& /*error*/, int /*signal_number*/) {
                  stop();
              });

            while (worker_thread_count != init_count)
                std::this_thread::yield();

            do_accept();

            std::thread(
              [this] {
                  notify_start();
                  io_context_.run();
                  CROW_LOG_INFO << "Exiting.";
              })
              .join();
        }

        void stop()
        {
            shutting_down_ = true; // Prevent the acceptor from taking new connections

            // Explicitly close the acceptor
            // else asio will throw an exception (linux only), when trying to start server again:
            // what():  bind: Address already in use
            if (acceptor_.raw_acceptor().is_open())
            {
                CROW_LOG_INFO << "Closing acceptor. " << &acceptor_;
                error_code ec;
                acceptor_.raw_acceptor().close(ec);
                if (ec)
                {
                    CROW_LOG_WARNING << "Failed to close acceptor: " << ec.message();
                }
            }

            for (auto& io_context : io_context_pool_)
            {
                if (io_context != nullptr)
                {
                    CROW_LOG_INFO << "Closing IO service " << &io_context;
                    io_context->stop(); // Close all io_services (and HTTP connections)
                }
            }

            CROW_LOG_INFO << "Closing main IO service (" << &io_context_ << ')';
            io_context_.stop(); // Close main io_service
        }

        
        uint16_t port() const {
            return acceptor_.local_endpoint().port();
        }

        /// Wait until the server has properly started or until timeout
        std::cv_status wait_for_start(std::chrono::steady_clock::time_point wait_until)
        {
            std::unique_lock<std::mutex> lock(start_mutex_);

            std::cv_status status = std::cv_status::no_timeout;
            while (!server_started_ && !startup_failed_ && status == std::cv_status::no_timeout)
                status = cv_started_.wait_until(lock, wait_until);
            return status;
        }


        void signal_clear()
        {
            signals_.clear();
        }

        void signal_add(int signal_number)
        {
            signals_.add(signal_number);
        }

    private:
        size_t pick_io_context_idx()
        {
            size_t min_queue_idx = 0;

            // TODO improve load balancing
            // size_t is used here to avoid the security issue https://codeql.github.com/codeql-query-help/cpp/cpp-comparison-with-wider-type/
            // even though the max value of this can be only uint16_t as concurrency is uint16_t.
            for (size_t i = 1; i < task_queue_length_pool_.size() && task_queue_length_pool_[min_queue_idx] > 0; i++)
            // No need to check other io_services if the current one has no tasks
            {
                if (task_queue_length_pool_[i] < task_queue_length_pool_[min_queue_idx])
                    min_queue_idx = i;
            }
            return min_queue_idx;
        }

        void do_accept()
        {
            if (!shutting_down_)
            {
                size_t context_idx = pick_io_context_idx();
                asio::io_context& ic = *io_context_pool_[context_idx];
                auto p = std::make_shared<Connection<Adaptor, Handler, Middlewares...>>(
                    ic, handler_, server_name_, middlewares_,
                    get_cached_date_str_pool_[context_idx], *task_timer_pool_[context_idx], adaptor_ctx_, task_queue_length_pool_[context_idx]);
                    
                CROW_LOG_DEBUG << &ic << " {" << context_idx << "} queue length: " << task_queue_length_pool_[context_idx];

                acceptor_.raw_acceptor().async_accept(
                  p->socket(),
                  [this, p, &ic](error_code ec) {
                      if (!ec)
                      {
                          asio::post(ic,
                            [p] {
                                p->start();
                            });
                      }
                      do_accept();
                  });
            }
        }

        /// Notify anything using `wait_for_start()` to proceed
        void notify_start()
        {
            std::unique_lock<std::mutex> lock(start_mutex_);
            server_started_ = true;
            cv_started_.notify_all();
        }

    private:
        unsigned int concurrency_{2};
        std::vector<std::atomic<unsigned int>> task_queue_length_pool_;
        std::vector<std::unique_ptr<asio::io_context>> io_context_pool_;
        asio::io_context io_context_;
        std::vector<detail::task_timer*> task_timer_pool_;
        std::vector<std::function<std::string()>> get_cached_date_str_pool_;
        Acceptor acceptor_;
        bool shutting_down_ = false;
        bool server_started_{false};
        bool startup_failed_ = false;
        std::condition_variable cv_started_;
        std::mutex start_mutex_;
        asio::signal_set signals_;

        asio::basic_waitable_timer<std::chrono::high_resolution_clock> tick_timer_;

        Handler* handler_;
        std::uint8_t timeout_;
        std::string server_name_;
        bool use_unix_;

        std::chrono::milliseconds tick_interval_;
        std::function<void()> tick_function_;

        std::tuple<Middlewares...>* middlewares_;

        typename Adaptor::context* adaptor_ctx_;
    };
} // namespace crow

1	#pragma once
2
3	#ifdef CROW_USE_BOOST
4	#include <boost/asio.hpp>
5	#ifdef CROW_ENABLE_SSL
6	#include <boost/asio/ssl.hpp>
7	#endif
8	#else
9	#ifndef ASIO_STANDALONE
10	#define ASIO_STANDALONE
11	#endif
12	#include <asio.hpp>
13	#ifdef CROW_ENABLE_SSL
14	#include <asio/ssl.hpp>
15	#endif
16	#endif
17
18	#include <atomic>
19	#include <chrono>
20	#include <cstdint>
21	#include <future>
22	#include <memory>
23	#include <thread>
24	#include <vector>
25
26	#include "crow/version.h"
27	#include "crow/http_connection.h"
28	#include "crow/logging.h"
29	#include "crow/task_timer.h"
30	#include "crow/socket_acceptors.h"
31
32
33	namespace crow // NOTE: Already documented in "crow/app.h"
34	{
35	#ifdef CROW_USE_BOOST
36	namespace asio = boost::asio;
37	using error_code = boost::system::error_code;
38	#else
39	using error_code = asio::error_code;
40	#endif
41	using tcp = asio::ip::tcp;
42	using stream_protocol = asio::local::stream_protocol;
43
44	template<typename Handler, typename Acceptor = TCPAcceptor, typename Adaptor = SocketAdaptor, typename... Middlewares>
45	class Server
46	{
47	public:
48	Server(Handler* handler,	35✔
49	typename Acceptor::endpoint endpoint,
50	std::string server_name = std::string("Crow/") + VERSION,
51	std::tuple<Middlewares...>* middlewares = nullptr,
52	unsigned int concurrency = 1,
53	uint8_t timeout = 5,
54	typename Adaptor::context* adaptor_ctx = nullptr):
55	concurrency_(concurrency),	35✔
56	task_queue_length_pool_(concurrency_ - 1),	70✔
57	acceptor_(io_context_),	35✔
58	signals_(io_context_),	35✔
59	tick_timer_(io_context_),	35✔
60	handler_(handler),	34✔
61	timeout_(timeout),	34✔
62	server_name_(server_name),	34✔
63	middlewares_(middlewares),	35✔
64	adaptor_ctx_(adaptor_ctx)	104✔
65	{
66	if (startup_failed_) {	35✔
67	CROW_LOG_ERROR << "Startup failed; not running server.";	×
68	return;	×
69	}
70
71	error_code ec;	35✔
72
73	acceptor_.raw_acceptor().open(endpoint.protocol(), ec);	35✔
74	if (ec) {	35✔
75	CROW_LOG_ERROR << "Failed to open acceptor: " << ec.message();	×
76	startup_failed_ = true;	×
77	return;	×
78	}
79
80	acceptor_.raw_acceptor().set_option(Acceptor::reuse_address_option(), ec);	35✔
81	if (ec) {	35✔
82	CROW_LOG_ERROR << "Failed to set socket option: " << ec.message();	×
83	startup_failed_ = true;	×
84	return;	×
85	}
86
87	acceptor_.raw_acceptor().bind(endpoint, ec);	35✔
88	if (ec) {	35✔
89	CROW_LOG_ERROR << "Failed to bind to " << acceptor_.address()	×
90	<< ":" << acceptor_.port() << " - " << ec.message();	×
91	startup_failed_ = true;	×
92	return;	×
93	}
94
95	acceptor_.raw_acceptor().listen(tcp::acceptor::max_listen_connections, ec);	35✔
96	if (ec) {	35✔
97	CROW_LOG_ERROR << "Failed to listen on port: " << ec.message();	×
98	startup_failed_ = true;	×
99	return;	×
100	}
101
102
103	}	×
104
105	void set_tick_function(std::chrono::milliseconds d, std::function<void()> f)	33✔
106	{
107	tick_interval_ = d;	33✔
108	tick_function_ = f;	33✔
109	}	34✔
110
111	void on_tick()	×
112	{
113	tick_function_();	×
114	tick_timer_.expires_after(std::chrono::milliseconds(tick_interval_.count()));	×
115	tick_timer_.async_wait([this](const error_code& ec) {	×
116	if (ec)	×
117	return;	×
118	on_tick();	×
119	});
120	}
121
122	void run()	34✔
123	{
124
125	if (startup_failed_) {	34✔
126	CROW_LOG_ERROR << "Server startup failed. Aborting run().";	×
127	return;	×
128	}
129
130	uint16_t worker_thread_count = concurrency_ - 1;	34✔
131	for (int i = 0; i < worker_thread_count; i++)	68✔
132	io_context_pool_.emplace_back(new asio::io_context());	34✔
133	get_cached_date_str_pool_.resize(worker_thread_count);	34✔
134	task_timer_pool_.resize(worker_thread_count);	34✔
135
136	std::vector<std::future<void>> v;	34✔
137	std::atomic<int> init_count(0);	34✔
138	for (uint16_t i = 0; i < worker_thread_count; i++)	68✔
139	v.push_back(	34✔
140	std::async(
141	std::launch::async, [this, i, &init_count] {	102✔
142	// thread local date string get function
143	auto last = std::chrono::steady_clock::now();	34✔
144
145	std::string date_str;	34✔
146	auto update_date_str = [&] {	68✔
147	auto last_time_t = time(0);	34✔
148	tm my_tm;
149
150	#if defined(_MSC_VER) \|\| defined(__MINGW32__)
151	gmtime_s(&my_tm, &last_time_t);
152	#else
153	gmtime_r(&last_time_t, &my_tm);	34✔
154	#endif
155	date_str.resize(100);	34✔
156	size_t date_str_sz = strftime(&date_str[0], 99, "%a, %d %b %Y %H:%M:%S GMT", &my_tm);	34✔
157	date_str.resize(date_str_sz);	34✔
158	};
159	update_date_str();	34✔
160	get_cached_date_str_pool_[i] = [&]() -> std::string {	34✔
UNCOV 161	if (std::chrono::steady_clock::now() - last >= std::chrono::seconds(1))	×
162	{
UNCOV 163	last = std::chrono::steady_clock::now();	×
UNCOV 164	update_date_str();	×
165	}
UNCOV 166	return date_str;	×
167	};
168
169	// initializing task timers
170	detail::task_timer task_timer(*io_context_pool_[i]);	34✔
171	task_timer.set_default_timeout(timeout_);	34✔
172	task_timer_pool_[i] = &task_timer;	34✔
173	task_queue_length_pool_[i] = 0;	34✔
174
175	init_count++;	34✔
176	while (1)	33✔
177	{
178	try
179	{
180	if (io_context_pool_[i]->run() == 0)	67✔
181	{
182	// when io_service.run returns 0, there are no more works to do.
183	break;	34✔
184	}
185	}
186	catch (std::exception& e)	×
187	{
188	CROW_LOG_ERROR << "Worker Crash: An uncaught exception occurred: " << e.what();	×
189	}
190	}
191	}));	34✔
192
193	if (tick_function_ && tick_interval_.count() > 0)	34✔
194	{
195	tick_timer_.expires_after(std::chrono::milliseconds(tick_interval_.count()));	×
196	tick_timer_.async_wait(	×
197	[this](const error_code& ec) {	×
198	if (ec)	×
199	return;	×
200	on_tick();	×
201	});
202	}
203	handler_->port(acceptor_.port());	34✔
204	handler_->address_is_bound();	34✔
205	CROW_LOG_INFO << server_name_	68✔
206	<< " server is running at " << acceptor_.url_display(handler_->ssl_used())	68✔
207	<< " using " << concurrency_ << " threads";	34✔
208	CROW_LOG_INFO << "Call `app.loglevel(crow::LogLevel::Warning)` to hide Info level logs.";	34✔
209
210	signals_.async_wait(	34✔
211	[&](const error_code& /error/, int /signal_number/) {	34✔
212	stop();	×
213	});
214
215	while (worker_thread_count != init_count)	543✔
216	std::this_thread::yield();	509✔
217
218	do_accept();	34✔
219
220	std::thread(	34✔
221	[this] {	68✔
222	notify_start();	34✔
223	io_context_.run();	34✔
224	CROW_LOG_INFO << "Exiting.";	34✔
225	})
226	.join();	34✔
227	}	34✔
228
229	void stop()	34✔
230	{
231	shutting_down_ = true; // Prevent the acceptor from taking new connections	34✔
232
233	// Explicitly close the acceptor
234	// else asio will throw an exception (linux only), when trying to start server again:
235	// what(): bind: Address already in use
236	if (acceptor_.raw_acceptor().is_open())	34✔
237	{
238	CROW_LOG_INFO << "Closing acceptor. " << &acceptor_;	34✔
239	error_code ec;	34✔
240	acceptor_.raw_acceptor().close(ec);	34✔
241	if (ec)	34✔
242	{
243	CROW_LOG_WARNING << "Failed to close acceptor: " << ec.message();	×
244	}
245	}
246
247	for (auto& io_context : io_context_pool_)	68✔
248	{
249	if (io_context != nullptr)	34✔
250	{
251	CROW_LOG_INFO << "Closing IO service " << &io_context;	34✔
252	io_context->stop(); // Close all io_services (and HTTP connections)	34✔
253	}
254	}
255
256	CROW_LOG_INFO << "Closing main IO service (" << &io_context_ << ')';	34✔
257	io_context_.stop(); // Close main io_service	34✔
258	}	34✔
259
260
261	uint16_t port() const {	4✔
262	return acceptor_.local_endpoint().port();	4✔
263	}
264
265	/// Wait until the server has properly started or until timeout
266	std::cv_status wait_for_start(std::chrono::steady_clock::time_point wait_until)	34✔
267	{
268	std::unique_lock<std::mutex> lock(start_mutex_);	34✔
269
270	std::cv_status status = std::cv_status::no_timeout;	34✔
271	while (!server_started_ && !startup_failed_ && status == std::cv_status::no_timeout)	67✔
272	status = cv_started_.wait_until(lock, wait_until);	33✔
273	return status;	34✔
274	}	34✔
275
276
277	void signal_clear()	1✔
278	{
279	signals_.clear();	1✔
280	}	1✔
281
282	void signal_add(int signal_number)	67✔
283	{
284	signals_.add(signal_number);	67✔
285	}	68✔
286
287	private:
288	size_t pick_io_context_idx()	101✔
289	{
290	size_t min_queue_idx = 0;	101✔
291
292	// TODO improve load balancing
293	// size_t is used here to avoid the security issue https://codeql.github.com/codeql-query-help/cpp/cpp-comparison-with-wider-type/
294	// even though the max value of this can be only uint16_t as concurrency is uint16_t.
295	for (size_t i = 1; i < task_queue_length_pool_.size() && task_queue_length_pool_[min_queue_idx] > 0; i++)	101✔
296	// No need to check other io_services if the current one has no tasks
297	{
298	if (task_queue_length_pool_[i] < task_queue_length_pool_[min_queue_idx])	×
299	min_queue_idx = i;	×
300	}
301	return min_queue_idx;	101✔
302	}
303
304	void do_accept()	134✔
305	{
306	if (!shutting_down_)	134✔
307	{
308	size_t context_idx = pick_io_context_idx();	101✔
309	asio::io_context& ic = *io_context_pool_[context_idx];	101✔
310	auto p = std::make_shared<Connection<Adaptor, Handler, Middlewares...>>(	202✔
311	ic, handler_, server_name_, middlewares_,	101✔
312	get_cached_date_str_pool_[context_idx], *task_timer_pool_[context_idx], adaptor_ctx_, task_queue_length_pool_[context_idx]);	101✔
313
314	CROW_LOG_DEBUG << &ic << " {" << context_idx << "} queue length: " << task_queue_length_pool_[context_idx];	101✔
315
316	acceptor_.raw_acceptor().async_accept(	200✔
317	p->socket(),	101✔
318	[this, p, &ic](error_code ec) {	302✔
319	if (!ec)	100✔
320	{
321	asio::post(ic,	68✔
322	[p] {	272✔
323	p->start();	68✔
324	});
325	}
326	do_accept();	100✔
327	});
328	}	101✔
329	}	134✔
330
331	/// Notify anything using `wait_for_start()` to proceed
332	void notify_start()	34✔
333	{
334	std::unique_lock<std::mutex> lock(start_mutex_);	34✔
335	server_started_ = true;	34✔
336	cv_started_.notify_all();	34✔
337	}	34✔
338
339	private:
340	unsigned int concurrency_{2};
341	std::vector<std::atomic<unsigned int>> task_queue_length_pool_;
342	std::vector<std::unique_ptr<asio::io_context>> io_context_pool_;
343	asio::io_context io_context_;
344	std::vector<detail::task_timer*> task_timer_pool_;
345	std::vector<std::function<std::string()>> get_cached_date_str_pool_;
346	Acceptor acceptor_;
347	bool shutting_down_ = false;
348	bool server_started_{false};
349	bool startup_failed_ = false;
350	std::condition_variable cv_started_;
351	std::mutex start_mutex_;
352	asio::signal_set signals_;
353
354	asio::basic_waitable_timer<std::chrono::high_resolution_clock> tick_timer_;
355
356	Handler* handler_;
357	std::uint8_t timeout_;
358	std::string server_name_;
359	bool use_unix_;
360
361	std::chrono::milliseconds tick_interval_;
362	std::function<void()> tick_function_;
363
364	std::tuple<Middlewares...>* middlewares_;
365
366	typename Adaptor::context* adaptor_ctx_;
367	};
368	} // namespace crow

CrowCpp / Crow / 809

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