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monero/contrib/epee/include/console_handler.h

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