457 lines
13 KiB
C++
457 lines
13 KiB
C++
// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the Andrey N. Sabelnikov nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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#pragma once
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#include <atomic>
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#include <condition_variable>
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#include <functional>
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#include <mutex>
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#include <thread>
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namespace epee
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{
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class async_stdin_reader
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{
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public:
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async_stdin_reader()
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: m_run(true)
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, m_has_read_request(false)
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, m_read_status(state_init)
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{
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m_reader_thread = std::thread(std::bind(&async_stdin_reader::reader_thread_func, this));
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}
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~async_stdin_reader()
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{
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stop();
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}
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// Not thread safe. Only one thread can call this method at once.
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bool get_line(std::string& line)
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{
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if (!start_read())
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return false;
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std::unique_lock<std::mutex> lock(m_response_mutex);
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while (state_init == m_read_status)
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{
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m_response_cv.wait(lock);
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}
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bool res = false;
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if (state_success == m_read_status)
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{
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line = m_line;
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res = true;
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}
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m_read_status = state_init;
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return res;
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}
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void stop()
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{
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if (m_run)
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{
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m_run.store(false, std::memory_order_relaxed);
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#if defined(WIN32)
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::CloseHandle(::GetStdHandle(STD_INPUT_HANDLE));
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#endif
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m_request_cv.notify_one();
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m_reader_thread.join();
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}
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}
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private:
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bool start_read()
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{
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std::unique_lock<std::mutex> lock(m_request_mutex);
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if (!m_run.load(std::memory_order_relaxed) || m_has_read_request)
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return false;
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m_has_read_request = true;
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m_request_cv.notify_one();
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return true;
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}
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bool wait_read()
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{
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std::unique_lock<std::mutex> lock(m_request_mutex);
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while (m_run.load(std::memory_order_relaxed) && !m_has_read_request)
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{
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m_request_cv.wait(lock);
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}
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if (m_has_read_request)
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{
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m_has_read_request = false;
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return true;
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}
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return false;
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}
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bool wait_stdin_data()
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{
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#if !defined(WIN32)
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int stdin_fileno = ::fileno(stdin);
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while (m_run.load(std::memory_order_relaxed))
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{
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fd_set read_set;
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FD_ZERO(&read_set);
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FD_SET(stdin_fileno, &read_set);
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struct timeval tv;
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tv.tv_sec = 0;
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tv.tv_usec = 100 * 1000;
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int retval = ::select(stdin_fileno + 1, &read_set, NULL, NULL, &tv);
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if (retval < 0)
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return false;
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else if (0 < retval)
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return true;
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}
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#endif
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return true;
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}
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void reader_thread_func()
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{
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while (true)
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{
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if (!wait_read())
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break;
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std::string line;
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bool read_ok = true;
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if (wait_stdin_data())
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{
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if (m_run.load(std::memory_order_relaxed))
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{
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std::getline(std::cin, line);
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read_ok = !std::cin.eof() && !std::cin.fail();
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}
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}
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else
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{
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read_ok = false;
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}
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{
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std::unique_lock<std::mutex> lock(m_response_mutex);
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if (m_run.load(std::memory_order_relaxed))
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{
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m_line = std::move(line);
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m_read_status = read_ok ? state_success : state_error;
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}
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else
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{
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m_read_status = state_cancelled;
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}
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m_response_cv.notify_one();
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}
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}
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}
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enum t_state
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{
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state_init,
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state_success,
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state_error,
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state_cancelled
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};
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private:
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std::thread m_reader_thread;
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std::atomic<bool> m_run;
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std::string m_line;
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bool m_has_read_request;
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t_state m_read_status;
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std::mutex m_request_mutex;
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std::mutex m_response_mutex;
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std::condition_variable m_request_cv;
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std::condition_variable m_response_cv;
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};
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template<class t_server>
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bool empty_commands_handler(t_server* psrv, const std::string& command)
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{
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return true;
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}
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class async_console_handler
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{
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public:
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async_console_handler()
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{
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}
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template<class t_server, class chain_handler>
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bool run(t_server* psrv, chain_handler ch_handler, const std::string& prompt = "#", const std::string& usage = "")
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{
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return run(prompt, usage, [&](const std::string& cmd) { return ch_handler(psrv, cmd); }, [&] { psrv->send_stop_signal(); });
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}
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template<class chain_handler>
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bool run(chain_handler ch_handler, const std::string& prompt = "#", const std::string& usage = "")
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{
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return run(prompt, usage, [&](const std::string& cmd) { return ch_handler(cmd); }, [] { });
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}
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void stop()
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{
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m_stdin_reader.stop();
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}
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private:
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template<typename t_cmd_handler, typename t_exit_handler>
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bool run(const std::string& prompt, const std::string& usage, const t_cmd_handler& cmd_handler, const t_exit_handler& exit_handler)
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{
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TRY_ENTRY();
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bool continue_handle = true;
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while(continue_handle)
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{
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if (!prompt.empty())
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{
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epee::log_space::set_console_color(epee::log_space::console_color_yellow, true);
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std::cout << prompt;
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if (' ' != prompt.back())
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std::cout << ' ';
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epee::log_space::reset_console_color();
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std::cout.flush();
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}
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std::string command;
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if(!m_stdin_reader.get_line(command))
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{
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LOG_PRINT("Failed to read line. Ignoring and continuing to run, exiting daemon may require a SIGTERM kill.", LOG_LEVEL_0);
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}
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string_tools::trim(command);
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LOG_PRINT_L2("Read command: " << command);
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if(0 == command.compare("exit") || 0 == command.compare("q"))
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{
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continue_handle = false;
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}else if (command.empty())
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{
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continue;
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}
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else if(cmd_handler(command))
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{
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continue;
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} else
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{
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std::cout << "unknown command: " << command << std::endl;
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std::cout << usage;
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}
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}
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exit_handler();
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return true;
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CATCH_ENTRY_L0("console_handler", false);
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}
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private:
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async_stdin_reader m_stdin_reader;
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};
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template<class t_server, class t_handler>
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bool start_default_console(t_server* ptsrv, t_handler handlr, const std::string& prompt, const std::string& usage = "")
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{
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std::shared_ptr<async_console_handler> console_handler = std::make_shared<async_console_handler>();
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boost::thread([=](){console_handler->run<t_server, t_handler>(ptsrv, handlr, prompt, usage);}).detach();
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return true;
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}
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template<class t_server>
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bool start_default_console(t_server* ptsrv, const std::string& prompt, const std::string& usage = "")
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{
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return start_default_console(ptsrv, empty_commands_handler<t_server>, prompt, usage);
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}
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template<class t_server, class t_handler>
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bool no_srv_param_adapter(t_server* ptsrv, const std::string& cmd, t_handler handlr)
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{
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return handlr(cmd);
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}
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template<class t_server, class t_handler>
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bool run_default_console_handler_no_srv_param(t_server* ptsrv, t_handler handlr, const std::string& prompt, const std::string& usage = "")
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{
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async_console_handler console_handler;
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return console_handler.run(ptsrv, boost::bind<bool>(no_srv_param_adapter<t_server, t_handler>, _1, _2, handlr), prompt, usage);
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}
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template<class t_server, class t_handler>
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bool start_default_console_handler_no_srv_param(t_server* ptsrv, t_handler handlr, const std::string& prompt, const std::string& usage = "")
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{
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boost::thread( boost::bind(run_default_console_handler_no_srv_param<t_server, t_handler>, ptsrv, handlr, prompt, usage) );
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return true;
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}
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/*template<class a>
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bool f(int i, a l)
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{
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return true;
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}*/
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/*
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template<class chain_handler>
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bool default_console_handler2(chain_handler ch_handler, const std::string usage)
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*/
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/*template<class t_handler>
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bool start_default_console2(t_handler handlr, const std::string& usage = "")
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{
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//std::string usage_local = usage;
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boost::thread( boost::bind(default_console_handler2<t_handler>, handlr, usage) );
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//boost::function<bool ()> p__ = boost::bind(f<t_handler>, 1, handlr);
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//boost::function<bool ()> p__ = boost::bind(default_console_handler2<t_handler>, handlr, usage);
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//boost::thread tr(p__);
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return true;
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}*/
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/************************************************************************/
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/* */
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/************************************************************************/
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class console_handlers_binder
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{
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typedef boost::function<bool (const std::vector<std::string> &)> console_command_handler;
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typedef std::map<std::string, std::pair<console_command_handler, std::string> > command_handlers_map;
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std::unique_ptr<boost::thread> m_console_thread;
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command_handlers_map m_command_handlers;
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async_console_handler m_console_handler;
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public:
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std::string get_usage()
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{
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std::stringstream ss;
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size_t max_command_len = 0;
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for(auto& x:m_command_handlers)
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if(x.first.size() > max_command_len)
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max_command_len = x.first.size();
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for(auto& x:m_command_handlers)
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{
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ss.width(max_command_len + 3);
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ss << std::left << x.first << x.second.second << ENDL;
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}
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return ss.str();
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}
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void set_handler(const std::string& cmd, const console_command_handler& hndlr, const std::string& usage = "")
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{
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command_handlers_map::mapped_type & vt = m_command_handlers[cmd];
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vt.first = hndlr;
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vt.second = usage;
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}
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bool process_command_vec(const std::vector<std::string>& cmd)
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{
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if(!cmd.size())
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return false;
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auto it = m_command_handlers.find(cmd.front());
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if(it == m_command_handlers.end())
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return false;
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std::vector<std::string> cmd_local(cmd.begin()+1, cmd.end());
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return it->second.first(cmd_local);
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}
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bool process_command_str(const std::string& cmd)
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{
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std::vector<std::string> cmd_v;
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boost::split(cmd_v,cmd,boost::is_any_of(" "), boost::token_compress_on);
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return process_command_vec(cmd_v);
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}
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/*template<class t_srv>
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bool start_handling(t_srv& srv, const std::string& usage_string = "")
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{
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start_default_console_handler_no_srv_param(&srv, boost::bind(&console_handlers_binder::process_command_str, this, _1));
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return true;
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}*/
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bool start_handling(const std::string& prompt, const std::string& usage_string = "")
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{
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m_console_thread.reset(new boost::thread(boost::bind(&console_handlers_binder::run_handling, this, prompt, usage_string)));
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m_console_thread->detach();
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return true;
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}
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void stop_handling()
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{
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m_console_handler.stop();
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}
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bool run_handling(const std::string& prompt, const std::string& usage_string)
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{
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return m_console_handler.run(boost::bind(&console_handlers_binder::process_command_str, this, _1), prompt, usage_string);
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}
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/*template<class t_srv>
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bool run_handling(t_srv& srv, const std::string& usage_string)
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{
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return run_default_console_handler_no_srv_param(&srv, boost::bind<bool>(&console_handlers_binder::process_command_str, this, _1), usage_string);
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}*/
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};
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/* work around because of broken boost bind */
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template<class t_server>
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class srv_console_handlers_binder: public console_handlers_binder
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{
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bool process_command_str(t_server* /*psrv*/, const std::string& cmd)
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{
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return console_handlers_binder::process_command_str(cmd);
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}
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public:
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bool start_handling(t_server* psrv, const std::string& prompt, const std::string& usage_string = "")
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{
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boost::thread(boost::bind(&srv_console_handlers_binder<t_server>::run_handling, this, psrv, prompt, usage_string)).detach();
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return true;
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}
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bool run_handling(t_server* psrv, const std::string& prompt, const std::string& usage_string)
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{
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return m_console_handler.run(psrv, boost::bind(&srv_console_handlers_binder<t_server>::process_command_str, this, _1, _2), prompt, usage_string);
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}
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void stop_handling()
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{
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m_console_handler.stop();
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}
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private:
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async_console_handler m_console_handler;
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};
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}
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