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mover.go
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mover.go
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package standort
import (
"os"
"github.com/friedenberg/zit/src/alfa/errors"
"github.com/friedenberg/zit/src/bravo/files"
"github.com/friedenberg/zit/src/bravo/id"
"github.com/friedenberg/zit/src/bravo/log"
"github.com/friedenberg/zit/src/charlie/sha"
)
type Mover struct {
file *os.File
Writer
basePath string
objektePath string
lockFile bool
errorOnAttemptedOverwrite bool
}
func (s Standort) NewMover(o MoveOptions) (m *Mover, err error) {
m = &Mover{
lockFile: o.LockFile,
errorOnAttemptedOverwrite: o.ErrorOnAttemptedOverwrite,
}
if o.GenerateFinalPathFromSha {
m.basePath = o.FinalPath
} else {
m.objektePath = o.FinalPath
}
if m.file, err = s.FileTempLocal(); err != nil {
err = errors.Wrap(err)
return
}
wo := WriteOptions{
Age: o.Age,
CompressionType: o.CompressionType,
Writer: m.file,
}
if m.Writer, err = NewWriter(wo); err != nil {
err = errors.Wrap(err)
return
}
return
}
func (m *Mover) Close() (err error) {
if m.file == nil {
err = errors.Errorf("nil file")
return
}
if m.Writer == nil {
err = errors.Errorf("nil objekte reader")
return
}
if err = m.Writer.Close(); err != nil {
err = errors.Wrap(err)
return
}
var fi os.FileInfo
if fi, err = m.file.Stat(); err != nil {
err = errors.Wrap(err)
return
}
if err = files.Close(m.file); err != nil {
err = errors.Wrap(err)
return
}
sh := m.Writer.GetShaLike()
log.Log().Printf(
"wrote %d bytes to %s, sha %s",
fi.Size(),
m.file.Name(),
sh,
)
if m.objektePath == "" {
// TODO-P3 move this validation to options
if m.basePath == "" {
err = errors.Errorf("basepath is nil")
return
}
if m.objektePath, err = id.MakeDirIfNecessary(sh, m.basePath); err != nil {
err = errors.Wrap(err)
return
}
}
p := m.file.Name()
if err = os.Rename(p, m.objektePath); err != nil {
if files.Exists(m.objektePath) {
if m.errorOnAttemptedOverwrite {
err = ErrAlreadyExists{
Sha: sha.Make(sh),
Path: m.objektePath,
}
} else {
err = nil
}
return
} else {
err = errors.Wrap(err)
return
}
}
log.Log().Printf("moved %s to %s", p, m.objektePath)
if m.lockFile {
if err = files.SetDisallowUserChanges(m.objektePath); err != nil {
err = errors.Wrap(err)
return
}
}
return
}