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monero/contrib/epee/include/console_handler.h
Thomas Winget 9193d6fb5b
Daemonize changes pulled in -- daemon builds 
many RPC functions added by the daemonize changes
(and related changes on the upstream dev branch that were not merged)
were commented out (apart from return).  Other than that, this *should*
work...at any rate, it builds, and that's something.
2015-02-24 00:05:19 -05:00

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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>
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;
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;
}
m_read_status = state_init;
return res;
}
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)
int stdin_fileno = ::fileno(stdin);
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;
}
{
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
};
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 = "")
{
return run(prompt, usage, [&](const std::string& cmd) { return ch_handler(cmd); }, [] { });
}
void stop()
{
m_running = false;
m_stdin_reader.stop();
}
private:
template<typename t_cmd_handler, typename t_exit_handler>
bool run(const std::string& prompt, const std::string& usage, const t_cmd_handler& cmd_handler, const t_exit_handler& exit_handler)
{
TRY_ENTRY();
bool continue_handle = true;
while(continue_handle)
{
if (!m_running)
{
break;
}
if (!prompt.empty())
{
epee::log_space::set_console_color(epee::log_space::console_color_yellow, true);
std::cout << prompt;
if (' ' != prompt.back())
std::cout << ' ';
epee::log_space::reset_console_color();
std::cout.flush();
}
std::string command;
if(!m_stdin_reader.get_line(command))
{
LOG_PRINT("Failed to read line.", LOG_LEVEL_0);
}
string_tools::trim(command);
LOG_PRINT_L2("Read command: " << command);
if(0 == command.compare("exit") || 0 == command.compare("q"))
{
continue_handle = false;
}else if (command.empty())
{
continue;
}
else if(cmd_handler(command))
{
continue;
} else
{
std::cout << "unknown command: " << command << std::endl;
std::cout << usage;
}
}
exit_handler();
return true;
CATCH_ENTRY_L0("console_handler", false);
}
private:
async_stdin_reader m_stdin_reader;
std::atomic<bool> m_running = {true};
};
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 = "")
{
m_console_thread.reset(new boost::thread(boost::bind(&console_handlers_binder::run_handling, this, prompt, usage_string)));
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)
{
return m_console_handler.run(boost::bind(&console_handlers_binder::process_command_str, this, _1), prompt, usage_string);
}
};
///* 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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