mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-28 20:50:49 +00:00
100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
#include "StatusFile.h"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/file.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
|
|
#include <Poco/File.h>
|
|
#include <common/logger_useful.h>
|
|
#include <Common/ClickHouseRevision.h>
|
|
#include <common/LocalDateTime.h>
|
|
|
|
#include <IO/ReadBufferFromFile.h>
|
|
#include <IO/LimitReadBuffer.h>
|
|
#include <IO/WriteBufferFromFileDescriptor.h>
|
|
#include <IO/Operators.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
namespace ErrorCodes
|
|
{
|
|
extern const int CANNOT_OPEN_FILE;
|
|
extern const int CANNOT_CLOSE_FILE;
|
|
extern const int CANNOT_TRUNCATE_FILE;
|
|
extern const int CANNOT_SEEK_THROUGH_FILE;
|
|
}
|
|
|
|
|
|
StatusFile::StatusFile(const std::string & path_)
|
|
: path(path_)
|
|
{
|
|
/// If file already exists. NOTE Minor race condition.
|
|
if (Poco::File(path).exists())
|
|
{
|
|
std::string contents;
|
|
{
|
|
ReadBufferFromFile in(path, 1024);
|
|
LimitReadBuffer limit_in(in, 1024, false);
|
|
readStringUntilEOF(contents, limit_in);
|
|
}
|
|
|
|
if (!contents.empty())
|
|
LOG_INFO(&Logger::get("StatusFile"), "Status file " << path << " already exists - unclean restart. Contents:\n" << contents);
|
|
else
|
|
LOG_INFO(&Logger::get("StatusFile"), "Status file " << path << " already exists and is empty - probably unclean hardware restart.");
|
|
}
|
|
|
|
fd = ::open(path.c_str(), O_WRONLY | O_CREAT, 0666);
|
|
|
|
if (-1 == fd)
|
|
throwFromErrnoWithPath("Cannot open file " + path, path, ErrorCodes::CANNOT_OPEN_FILE);
|
|
|
|
try
|
|
{
|
|
int flock_ret = flock(fd, LOCK_EX | LOCK_NB);
|
|
if (-1 == flock_ret)
|
|
{
|
|
if (errno == EWOULDBLOCK)
|
|
throw Exception("Cannot lock file " + path + ". Another server instance in same directory is already running.", ErrorCodes::CANNOT_OPEN_FILE);
|
|
else
|
|
throwFromErrnoWithPath("Cannot lock file " + path, path, ErrorCodes::CANNOT_OPEN_FILE);
|
|
}
|
|
|
|
if (0 != ftruncate(fd, 0))
|
|
throwFromErrnoWithPath("Cannot ftruncate " + path, path, ErrorCodes::CANNOT_TRUNCATE_FILE);
|
|
|
|
if (0 != lseek(fd, 0, SEEK_SET))
|
|
throwFromErrnoWithPath("Cannot lseek " + path, path, ErrorCodes::CANNOT_SEEK_THROUGH_FILE);
|
|
|
|
/// Write information about current server instance to the file.
|
|
{
|
|
WriteBufferFromFileDescriptor out(fd, 1024);
|
|
out
|
|
<< "PID: " << getpid() << "\n"
|
|
<< "Started at: " << LocalDateTime(time(nullptr)) << "\n"
|
|
<< "Revision: " << ClickHouseRevision::get() << "\n";
|
|
}
|
|
}
|
|
catch (...)
|
|
{
|
|
close(fd);
|
|
throw;
|
|
}
|
|
}
|
|
|
|
|
|
StatusFile::~StatusFile()
|
|
{
|
|
if (0 != close(fd))
|
|
LOG_ERROR(&Logger::get("StatusFile"), "Cannot close file " << path << ", " << errnoToString(ErrorCodes::CANNOT_CLOSE_FILE));
|
|
|
|
if (0 != unlink(path.c_str()))
|
|
LOG_ERROR(&Logger::get("StatusFile"), "Cannot unlink file " << path << ", " << errnoToString(ErrorCodes::CANNOT_CLOSE_FILE));
|
|
}
|
|
|
|
}
|