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package safe
import (
"fmt"
"os"
"path/filepath"
)
type file interface {
Sync() error
Close() error
}
// Syncer implements helper methods for fsyncing files and directories.
type Syncer struct {
// open is used by the Sync* functions to open files for syncing. By default, Syncer opens
// files via the `os` package as usual. This is parametrized only so we can test the correct
// calls were made as we don't have good way to test the fsyncing otherwise.
open func(string) (file, error)
}
// NewSyncer returns a new Syncer.
func NewSyncer() Syncer {
return Syncer{
open: func(path string) (file, error) {
return os.Open(path)
},
}
}
// Sync opens the file/directory at the given path and syncs it. Syncing a directory syncs just
// the directory itself, not the children. If the children need to be synced as well, use SyncRecursive.
func (s Syncer) Sync(path string) error {
f, err := s.open(path)
if err != nil {
return fmt.Errorf("open: %w", err)
}
defer func() { _ = f.Close() }()
if err := f.Sync(); err != nil {
return fmt.Errorf("sync: %w", err)
}
if err := f.Close(); err != nil {
return fmt.Errorf("close: %w", err)
}
return nil
}
// SyncParent syncs the parent directory of the given path. The path is cleaned prior to determining
// the parent
func (s Syncer) SyncParent(path string) error {
return s.Sync(filepath.Dir(filepath.Clean(path)))
}
// SyncRecursive walks the file tree rooted at path and fsyncing the root and the children.
func (s Syncer) SyncRecursive(path string) error {
return filepath.WalkDir(path, func(path string, _ os.DirEntry, err error) error {
if err != nil {
return err
}
return s.Sync(path)
})
}
// SyncHierarchy walks the hierarchy from <rootPath>/<relativePath> up to the
// rootPath and syncs everything on the way. If the path points to a directory,
// it only syncs from the directory and upwards, not the contents of the directory.
func (s Syncer) SyncHierarchy(rootPath, relativePath string) error {
// Traverse the directory hierarchy all the way up to root and fsync them.
currentPath := filepath.Join(rootPath, relativePath)
for {
if err := s.Sync(currentPath); err != nil {
return fmt.Errorf("sync: %w", err)
}
if currentPath == rootPath {
break
}
currentPath = filepath.Dir(currentPath)
}
return nil
}
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