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96 lines
2.5 KiB
C++
96 lines
2.5 KiB
C++
#pragma once
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <DB/Common/ProfileEvents.h>
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#include <DB/IO/WriteBufferFromFileDescriptor.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 FILE_DOESNT_EXIST;
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extern const int CANNOT_OPEN_FILE;
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extern const int CANNOT_CLOSE_FILE;
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}
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/** Принимает имя файла. Самостоятельно открывает и закрывает файл.
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*/
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class WriteBufferFromFile : public WriteBufferFromFileDescriptor
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{
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private:
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std::string file_name;
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public:
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WriteBufferFromFile(const std::string & file_name_, size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE, int flags = -1, mode_t mode = 0666,
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char * existing_memory = nullptr, size_t alignment = 0)
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: WriteBufferFromFileDescriptor(-1, buf_size, existing_memory, alignment), file_name(file_name_)
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{
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ProfileEvents::increment(ProfileEvents::FileOpen);
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fd = open(file_name.c_str(), flags == -1 ? O_WRONLY | O_TRUNC | O_CREAT : flags, mode);
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if (-1 == fd)
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throwFromErrno("Cannot open file " + file_name, errno == ENOENT ? ErrorCodes::FILE_DOESNT_EXIST : ErrorCodes::CANNOT_OPEN_FILE);
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}
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/// Использовать уже открытый файл.
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WriteBufferFromFile(int fd, size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE, int flags = -1, mode_t mode = 0666,
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char * existing_memory = nullptr, size_t alignment = 0)
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: WriteBufferFromFileDescriptor(fd, buf_size, existing_memory, alignment), file_name("(fd = " + toString(fd) + ")")
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{
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}
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~WriteBufferFromFile()
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{
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if (fd < 0)
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return;
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try
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{
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next();
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}
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catch (...)
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{
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tryLogCurrentException(__PRETTY_FUNCTION__);
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}
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::close(fd);
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}
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/// Закрыть файл раньше вызова деструктора.
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void close()
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{
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next();
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if (0 != ::close(fd))
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throw Exception("Cannot close file", ErrorCodes::CANNOT_CLOSE_FILE);
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fd = -1;
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}
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/** fsync() transfers ("flushes") all modified in-core data of (i.e., modified buffer cache pages for) the file
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* referred to by the file descriptor fd to the disk device (or other permanent storage device)
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* so that all changed information can be retrieved even after the system crashed or was rebooted.
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* This includes writing through or flushing a disk cache if present. The call blocks until the device
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* reports that the transfer has completed. It also flushes metadata information associated with the file (see stat(2)).
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* - man fsync */
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void sync()
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{
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fsync(fd);
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}
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virtual std::string getFileName()
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{
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return file_name;
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}
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};
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}
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