mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-21 15:12:02 +00:00
100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
#include "StatusFile.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <Poco/File.h>
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#include <common/logger_useful.h>
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#include <Common/ClickHouseRevision.h>
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#include <common/LocalDateTime.h>
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#include <IO/ReadBufferFromFile.h>
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#include <IO/LimitReadBuffer.h>
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#include <IO/WriteBufferFromFileDescriptor.h>
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#include <IO/Operators.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int CANNOT_OPEN_FILE;
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extern const int CANNOT_CLOSE_FILE;
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extern const int CANNOT_TRUNCATE_FILE;
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extern const int CANNOT_SEEK_THROUGH_FILE;
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}
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StatusFile::StatusFile(const std::string & path_)
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: path(path_)
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{
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/// If file already exists. NOTE Minor race condition.
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if (Poco::File(path).exists())
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{
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std::string contents;
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{
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ReadBufferFromFile in(path, 1024);
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LimitReadBuffer limit_in(in, 1024, false);
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readStringUntilEOF(contents, limit_in);
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}
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if (!contents.empty())
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LOG_INFO(&Logger::get("StatusFile"), "Status file " << path << " already exists - unclean restart. Contents:\n" << contents);
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else
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LOG_INFO(&Logger::get("StatusFile"), "Status file " << path << " already exists and is empty - probably unclean hardware restart.");
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}
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fd = ::open(path.c_str(), O_WRONLY | O_CREAT | O_CLOEXEC, 0666);
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if (-1 == fd)
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throwFromErrnoWithPath("Cannot open file " + path, path, ErrorCodes::CANNOT_OPEN_FILE);
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try
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{
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int flock_ret = flock(fd, LOCK_EX | LOCK_NB);
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if (-1 == flock_ret)
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{
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if (errno == EWOULDBLOCK)
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throw Exception("Cannot lock file " + path + ". Another server instance in same directory is already running.", ErrorCodes::CANNOT_OPEN_FILE);
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else
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throwFromErrnoWithPath("Cannot lock file " + path, path, ErrorCodes::CANNOT_OPEN_FILE);
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}
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if (0 != ftruncate(fd, 0))
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throwFromErrnoWithPath("Cannot ftruncate " + path, path, ErrorCodes::CANNOT_TRUNCATE_FILE);
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if (0 != lseek(fd, 0, SEEK_SET))
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throwFromErrnoWithPath("Cannot lseek " + path, path, ErrorCodes::CANNOT_SEEK_THROUGH_FILE);
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/// Write information about current server instance to the file.
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{
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WriteBufferFromFileDescriptor out(fd, 1024);
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out
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<< "PID: " << getpid() << "\n"
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<< "Started at: " << LocalDateTime(time(nullptr)) << "\n"
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<< "Revision: " << ClickHouseRevision::get() << "\n";
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}
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}
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catch (...)
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{
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close(fd);
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throw;
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}
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}
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StatusFile::~StatusFile()
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{
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if (0 != close(fd))
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LOG_ERROR(&Logger::get("StatusFile"), "Cannot close file " << path << ", " << errnoToString(ErrorCodes::CANNOT_CLOSE_FILE));
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if (0 != unlink(path.c_str()))
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LOG_ERROR(&Logger::get("StatusFile"), "Cannot unlink file " << path << ", " << errnoToString(ErrorCodes::CANNOT_CLOSE_FILE));
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}
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}
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