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//-----------------------------------------------------------------------------
/** @file twogtp/GtpConnection.cpp
@author Markus Enzenberger
@copyright GNU General Public License version 3 or later */
//-----------------------------------------------------------------------------
#include "GtpConnection.h"
#include <cstring>
#include <vector>
#include <unistd.h>
#include "FdStream.h"
#include "libboardgame_base/Log.h"
//-----------------------------------------------------------------------------
namespace {
[[noreturn]] void terminate_child(const string& message)
{
LIBBOARDGAME_LOG(message);
exit(1);
}
vector<string> split_args(const string& s)
{
vector<string> result;
bool escape = false;
bool is_in_string = false;
ostringstream token;
for (auto c : s)
{
if (c == '"' && ! escape)
{
if (is_in_string)
{
result.push_back(token.str());
token.str("");
}
is_in_string = ! is_in_string;
}
else if ((isspace(c) != 0) && ! is_in_string)
{
if (! token.str().empty())
{
result.push_back(token.str());
token.str("");
}
}
else
token << c;
escape = (c == '\\' && ! escape);
}
if (! token.str().empty())
result.push_back(token.str());
return result;
}
} // namespace
//-----------------------------------------------------------------------------
GtpConnection::GtpConnection(const string& command)
{
auto args = split_args(command);
if (args.empty())
throw runtime_error("GtpConnection: empty command line");
int fd1[2];
if (pipe(fd1) < 0)
throw runtime_error("GtpConnection: pipe creation failed");
int fd2[2];
if (pipe(fd2) < 0)
{
close(fd1[0]);
close(fd1[1]);
throw runtime_error("GtpConnection: pipe creation failed");
}
pid_t pid;
if ((pid = fork()) < 0)
throw runtime_error("GtpConnection: fork failed");
if (pid > 0) // Parent
{
close(fd1[0]);
close(fd2[1]);
m_in = make_unique<FdInStream>(fd2[0]);
m_out = make_unique<FdOutStream>(fd1[1]);
return;
}
// Child
close(fd1[1]);
close(fd2[0]);
if (fd1[0] != STDIN_FILENO)
if (dup2(fd1[0], STDIN_FILENO) != STDIN_FILENO)
{
close(fd1[0]);
terminate_child("GtpConnection: dup2 to stdin failed");
}
if (fd2[1] != STDOUT_FILENO)
if (dup2(fd2[1], STDOUT_FILENO) != STDOUT_FILENO)
{
close(fd2[1]);
terminate_child("GtpConnection: dup2 to stdout failed");
}
vector<char*> argv;
argv.reserve(args.size() + 1);
for (auto& a : args)
argv.push_back(const_cast<char*>(a.c_str()));
argv.push_back(nullptr);
execvp(args[0].c_str(), &(*argv.begin()));
terminate_child("Could not execute '" + command + "': " + strerror(errno));
}
GtpConnection::~GtpConnection() = default; // Non-inline to avoid GCC -Winline warning
void GtpConnection::enable_log(const string& prefix)
{
m_quiet = false;
m_prefix = prefix;
}
string GtpConnection::send(const string& command)
{
if (! m_quiet)
LIBBOARDGAME_LOG(m_prefix, ">> ", command);
*m_out << command << '\n';
m_out->flush();
if (! *m_out)
throw Failure("GtpConnection: write failure");
ostringstream response;
bool done = false;
bool is_first = true;
bool success = true;
while (! done)
{
string line;
getline(*m_in, line);
if (! *m_in)
throw Failure("GtpConnection: read failure");
if (! m_quiet && ! line.empty())
LIBBOARDGAME_LOG(m_prefix, "<< ", line);
if (is_first)
{
if (line.size() < 2 || (line[0] != '=' && line[0] != '?')
|| line[1] != ' ')
throw Failure("GtpConnection: malformed response: '" + line
+ "'");
if (line[0] == '?')
success = false;
line = line.substr(2);
response << line;
is_first = false;
}
else
{
if (line.empty())
done = true;
else
response << '\n' << line;
}
}
if (! success)
throw Failure(response.str());
return response.str();
}
//-----------------------------------------------------------------------------
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