forked from TrueCloudLab/restic
92 lines
1.6 KiB
Go
92 lines
1.6 KiB
Go
package restic
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import (
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"fmt"
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"io"
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"os"
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"path/filepath"
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"github.com/restic/restic/backend"
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)
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type Cache struct {
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base string
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}
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func NewCache() (*Cache, error) {
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dir, err := GetCacheDir()
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if err != nil {
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return nil, err
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}
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return &Cache{base: dir}, nil
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}
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func (c *Cache) Has(t backend.Type, id backend.ID) (bool, error) {
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// try to open file
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filename, err := c.filename(t, id)
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if err != nil {
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return false, err
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}
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fd, err := os.Open(filename)
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defer fd.Close()
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if err != nil {
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if os.IsNotExist(err) {
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return false, nil
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}
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return false, err
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}
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return true, nil
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}
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func (c *Cache) Store(t backend.Type, id backend.ID, rd io.Reader) error {
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filename, err := c.filename(t, id)
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if err != nil {
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return err
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}
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dirname := filepath.Dir(filename)
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err = os.MkdirAll(dirname, 0700)
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if err != nil {
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return err
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}
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file, err := os.Create(filename)
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defer file.Close()
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if err != nil {
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return err
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}
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_, err = io.Copy(file, rd)
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return err
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}
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func (c *Cache) Load(t backend.Type, id backend.ID) (io.ReadCloser, error) {
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// try to open file
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filename, err := c.filename(t, id)
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if err != nil {
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return nil, err
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}
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return os.Open(filename)
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}
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// Construct file name for given Type.
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func (c *Cache) filename(t backend.Type, id backend.ID) (string, error) {
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cachedir, err := GetCacheDir()
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if err != nil {
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return "", err
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}
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switch t {
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case backend.Snapshot:
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return filepath.Join(cachedir, "snapshots", id.String()), nil
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case backend.Tree:
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return filepath.Join(cachedir, "trees", id.String()), nil
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}
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return "", fmt.Errorf("cache not supported for type %v", t)
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}
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