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/*
* Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU AGPL v3 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-AGPL3
* Copyright (C) 2021+ WarheadCore <https://github.com/WarheadCore>
*/
#include "StartProcess.h"
#include "Errors.h"
#include "Log.h"
#include "Optional.h"
#include "Util.h"
#include <filesystem>
#include <boost/algorithm/string/join.hpp>
#include <boost/iostreams/copy.hpp>
#include <boost/process/args.hpp>
#include <boost/process/child.hpp>
#include <boost/process/env.hpp>
#include <boost/process/exe.hpp>
#include <boost/process/io.hpp>
#include <boost/process/pipe.hpp>
#include <boost/process/search_path.hpp>
using namespace boost::process;
using namespace boost::iostreams;
namespace Acore
{
template<typename T>
class ACLogSink
{
T callback_;
public:
typedef char char_type;
typedef sink_tag category;
// Requires a callback type which has a void(std::string) signature
ACLogSink(T callback)
: callback_(std::move(callback)) { }
std::streamsize write(char const* str, std::streamsize size)
{
std::string consoleStr(str, size);
std::string utf8;
if (consoleToUtf8(consoleStr, utf8))
callback_(utf8);
return size;
}
};
template<typename T>
auto MakeACLogSink(T&& callback)
-> ACLogSink<typename std::decay<T>::type>
{
return { std::forward<T>(callback) };
}
template<typename T>
static int CreateChildProcess(T waiter, std::string const& executable,
std::vector<std::string> const& argsVector,
std::string const& logger, std::string const& input,
bool secure)
{
ipstream outStream;
ipstream errStream;
if (!secure)
{
LOG_TRACE(logger, "Starting process \"%s\" with arguments: \"%s\".",
executable.c_str(), boost::algorithm::join(argsVector, " ").c_str());
}
// prepare file with only read permission (boost process opens with read_write)
std::shared_ptr<FILE> inputFile(!input.empty() ? fopen(input.c_str(), "rb") : nullptr, [](FILE* ptr)
{
if (ptr != nullptr)
fclose(ptr);
});
// Start the child process
child c = [&]()
{
if (inputFile)
{
// With binding stdin
return child{
exe = std::filesystem::absolute(executable).string(),
args = argsVector,
env = environment(boost::this_process::environment()),
std_in = inputFile.get(),
std_out = outStream,
std_err = errStream
};
}
else
{
// Without binding stdin
return child{
exe = std::filesystem::absolute(executable).string(),
args = argsVector,
env = environment(boost::this_process::environment()),
std_in = boost::process::close,
std_out = outStream,
std_err = errStream
};
}
}();
auto outInfo = MakeACLogSink([&](std::string const& msg)
{
LOG_INFO(logger, "%s", msg.c_str());
});
auto outError = MakeACLogSink([&](std::string const& msg)
{
LOG_ERROR(logger, "%s", msg.c_str());
});
copy(outStream, outInfo);
copy(errStream, outError);
// Call the waiter in the current scope to prevent
// the streams from closing too early on leaving the scope.
int const result = waiter(c);
if (!secure)
{
LOG_TRACE(logger, ">> Process \"%s\" finished with return value %i.",
executable.c_str(), result);
}
return result;
}
int StartProcess(std::string const& executable, std::vector<std::string> const& args,
std::string const& logger, std::string input_file, bool secure)
{
return CreateChildProcess([](child& c) -> int
{
try
{
c.wait();
return c.exit_code();
}
catch (...)
{
return EXIT_FAILURE;
}
}, executable, args, logger, input_file, secure);
}
class AsyncProcessResultImplementation
: public AsyncProcessResult
{
std::string const executable;
std::vector<std::string> const args;
std::string const logger;
std::string const input_file;
bool const is_secure;
std::atomic<bool> was_terminated;
// Workaround for missing move support in boost < 1.57
Optional<std::shared_ptr<std::future<int>>> result;
Optional<std::reference_wrapper<child>> my_child;
public:
explicit AsyncProcessResultImplementation(std::string executable_, std::vector<std::string> args_,
std::string logger_, std::string input_file_,
bool secure)
: executable(std::move(executable_)), args(std::move(args_)),
logger(std::move(logger_)), input_file(input_file_),
is_secure(secure), was_terminated(false) { }
AsyncProcessResultImplementation(AsyncProcessResultImplementation const&) = delete;
AsyncProcessResultImplementation& operator= (AsyncProcessResultImplementation const&) = delete;
AsyncProcessResultImplementation(AsyncProcessResultImplementation&&) = delete;
AsyncProcessResultImplementation& operator= (AsyncProcessResultImplementation&&) = delete;
int StartProcess()
{
ASSERT(!my_child, "Process started already!");
return CreateChildProcess([&](child& c) -> int
{
int result;
my_child = std::reference_wrapper<child>(c);
try
{
c.wait();
result = c.exit_code();
}
catch (...)
{
result = EXIT_FAILURE;
}
my_child.reset();
return was_terminated ? EXIT_FAILURE : result;
}, executable, args, logger, input_file, is_secure);
}
void SetFuture(std::future<int> result_)
{
result = std::make_shared<std::future<int>>(std::move(result_));
}
/// Returns the future which contains the result of the process
/// as soon it is finished.
std::future<int>& GetFutureResult() override
{
ASSERT(*result, "The process wasn't started!");
return **result;
}
/// Tries to terminate the process
void Terminate() override
{
if (my_child)
{
was_terminated = true;
try
{
my_child->get().terminate();
}
catch (...)
{
// Do nothing
}
}
}
};
std::shared_ptr<AsyncProcessResult>
StartAsyncProcess(std::string executable, std::vector<std::string> args,
std::string logger, std::string input_file, bool secure)
{
auto handle = std::make_shared<AsyncProcessResultImplementation>(
std::move(executable), std::move(args), std::move(logger), std::move(input_file), secure);
handle->SetFuture(std::async(std::launch::async, [handle] { return handle->StartProcess(); }));
return handle;
}
std::string SearchExecutableInPath(std::string const& filename)
{
try
{
return search_path(filename).string();
}
catch (...)
{
return "";
}
}
} // namespace Acore
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