/
metadata.go
188 lines (171 loc) · 5 KB
/
metadata.go
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package ddsmetadata
import (
"fmt"
"github.com/892294101/cache-mmap/mmap"
"github.com/892294101/dds-spfile"
"github.com/892294101/dds-utils"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"os"
"path/filepath"
)
const (
_DefaultFilePerm = 0755
_DefaultMetadataSize = 512
)
const (
CREATE = iota // 创建元数据
LOAD // 加载元数据
)
type MdHandle struct {
path string // 元数据文件路径
//handle *os.File // 元数据句柄
handle *mmap.File // 元数据句柄
processName string // 进程名称
dataBaseType string // 数据库类型
processType string // 进程类型
log *logrus.Logger // 日志记录器
}
/*func (m *MdHandle) Unlock() error {
if err := syscall.Flock(int(m.handle.Fd()), syscall.LOCK_UN); err != nil {
m.log.Warnf("checkpoint file handle unlock failed: %v", err)
}
return nil
}*/
// 初始化元数据句柄
func (m *MdHandle) LoadMetaDataFile(processName string, dataBaseType string, processType string, log *logrus.Logger) error {
m.processName = processName
m.dataBaseType = dataBaseType
m.processType = processType
m.log = log
home, err := ddsutils.GetHomeDirectory()
if err != nil {
return err
}
file := filepath.Join(*home, "chk", fmt.Sprintf("%s.ce", m.processName))
m.path = file
/* fd, err := os.OpenFile(file, os.O_RDWR|os.O_SYNC, _DefaultFilePerm)
if err != nil {
return err
}
if err := syscall.Flock(int(fd.Fd()), syscall.LOCK_SH|syscall.LOCK_NB); err != nil {
return errors.Errorf("add checkpoint exclusive lock failed: %v", err)
}*/
fd, err := mmap.NewMmap(file, os.O_RDWR, _DefaultMetadataSize)
if err != nil {
return err
}
m.handle = fd
return nil
}
/*func (m *MdHandle) RemoveMetaDataFile() (err error) {
if utils.IsFileExist(m.path) {
err = os.Remove(m.path)
}
return err
}*/
// 初始化元数据句柄
func (m *MdHandle) CreateMetaDataFile(processName string, dataBaseType string, processType string, log *logrus.Logger) error {
m.processName = processName
m.dataBaseType = dataBaseType
m.processType = processType
m.log = log
home, err := ddsutils.GetHomeDirectory()
if err != nil {
return err
}
file := filepath.Join(*home, "chk", fmt.Sprintf("%s.ce", m.processName))
m.path = file
// 如果O_EXCL和O_CREATE一起使用则表示,文件必须不存在才能创建(如果文件存在则返回错误)
/*fd, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_EXCL, _DefaultFilePerm)
if err != nil {
return err
}
if err := syscall.Flock(int(fd.Fd()), syscall.LOCK_SH|syscall.LOCK_NB); err != nil {
return errors.Errorf("add checkpoint exclusive lock failed: %v", err)
}
if err = fd.Truncate(int64(_DefaultMetadataSize)); err != nil {
return errors.Errorf("error in extending checkpoint file: %v", err)
}
m.Unlock()
*/
fd, err := mmap.NewMmap(file, os.O_RDWR|os.O_CREATE|os.O_EXCL, _DefaultMetadataSize)
if err != nil {
return err
}
m.handle = fd
return nil
}
// 创建加载元数据文件
func InitMetaData(processName string, dataBaseType string, processType string, log *logrus.Logger, opsType int) (MetaData, error) {
var md MetaDatas
switch dataBaseType {
case ddsspfile.GetMySQLName():
switch processType {
case ddsspfile.GetExtractName():
md = &MySQLMetaDataBus{}
// 初始化元数据句柄
mdh := new(MdHandle)
switch opsType {
case CREATE:
err := mdh.CreateMetaDataFile(processName, dataBaseType, processType, log)
if err != nil {
return nil, err
}
case LOAD:
err := mdh.LoadMetaDataFile(processName, dataBaseType, processType, log)
if err != nil {
return nil, err
}
default:
return nil, errors.Errorf("Metadata operation type is not supported")
}
mdBus, err := md.Registry(mdh, log)
if err != nil {
return nil, err
}
if err := mdBus.Init(); err != nil {
return nil, err
}
return mdBus, nil
case ddsspfile.GetReplicationName():
return nil, errors.Errorf("The process type needs to be implemented")
default:
return nil, errors.Errorf("Metadata management does not support this process")
}
case ddsspfile.GetOracleName():
switch processType {
case ddsspfile.GetExtractName():
md = &OracleMetaDataBus{}
// 初始化元数据句柄
mdh := new(MdHandle)
switch opsType {
case CREATE:
err := mdh.CreateMetaDataFile(processName, dataBaseType, processType, log)
if err != nil {
return nil, err
}
case LOAD:
err := mdh.LoadMetaDataFile(processName, dataBaseType, processType, log)
if err != nil {
return nil, err
}
default:
return nil, errors.Errorf("Metadata operation type is not supported")
}
mdBus, err := md.Registry(mdh, log)
if err != nil {
return nil, err
}
if err := mdBus.Init(); err != nil {
return nil, err
}
return mdBus, nil
case ddsspfile.GetReplicationName():
return nil, errors.Errorf("The process type needs to be implemented")
}
default:
return nil, errors.Errorf("Metadata management does not support this database")
}
return nil, nil
}