restic/archiver.go

190 lines
3.5 KiB
Go

package khepri
import (
"os"
"path/filepath"
"github.com/fd0/khepri/backend"
)
type Archiver struct {
be backend.Server
key *Key
ch *ContentHandler
smap *StorageMap // blobs used for the current snapshot
Error func(dir string, fi os.FileInfo, err error) error
Filter func(item string, fi os.FileInfo) bool
}
func NewArchiver(be backend.Server, key *Key) (*Archiver, error) {
var err error
arch := &Archiver{be: be, key: key}
// abort on all errors
arch.Error = func(string, os.FileInfo, error) error { return err }
// allow all files
arch.Filter = func(string, os.FileInfo) bool { return true }
arch.smap = NewStorageMap()
arch.ch, err = NewContentHandler(be, key)
if err != nil {
return nil, err
}
// load all blobs from all snapshots
err = arch.ch.LoadAllSnapshots()
if err != nil {
return nil, err
}
return arch, nil
}
func (arch *Archiver) Save(t backend.Type, data []byte) (*Blob, error) {
blob, err := arch.ch.Save(t, data)
if err != nil {
return nil, err
}
// store blob in storage map for current snapshot
arch.smap.Insert(blob)
return blob, nil
}
func (arch *Archiver) SaveJSON(t backend.Type, item interface{}) (*Blob, error) {
blob, err := arch.ch.SaveJSON(t, item)
if err != nil {
return nil, err
}
// store blob in storage map for current snapshot
arch.smap.Insert(blob)
return blob, nil
}
func (arch *Archiver) SaveFile(node *Node) (Blobs, error) {
blobs, err := arch.ch.SaveFile(node.path, uint(node.Size))
if err != nil {
return nil, arch.Error(node.path, nil, err)
}
node.Content = make([]backend.ID, len(blobs))
for i, blob := range blobs {
node.Content[i] = blob.ID
arch.smap.Insert(blob)
}
return blobs, err
}
func (arch *Archiver) ImportDir(dir string) (Tree, error) {
fd, err := os.Open(dir)
defer fd.Close()
if err != nil {
return nil, arch.Error(dir, nil, err)
}
entries, err := fd.Readdir(-1)
if err != nil {
return nil, arch.Error(dir, nil, err)
}
if len(entries) == 0 {
return nil, nil
}
tree := Tree{}
for _, entry := range entries {
path := filepath.Join(dir, entry.Name())
if !arch.Filter(path, entry) {
continue
}
node, err := NodeFromFileInfo(path, entry)
if err != nil {
return nil, arch.Error(dir, entry, err)
}
tree = append(tree, node)
if entry.IsDir() {
subtree, err := arch.ImportDir(path)
if err != nil {
return nil, err
}
blob, err := arch.SaveJSON(backend.Tree, subtree)
if err != nil {
return nil, err
}
node.Subtree = blob.ID
continue
}
if node.Type == "file" {
_, err := arch.SaveFile(node)
if err != nil {
return nil, arch.Error(path, entry, err)
}
}
}
return tree, nil
}
func (arch *Archiver) Import(dir string) (*Snapshot, *Blob, error) {
sn := NewSnapshot(dir)
fi, err := os.Lstat(dir)
if err != nil {
return nil, nil, err
}
node, err := NodeFromFileInfo(dir, fi)
if err != nil {
return nil, nil, err
}
if node.Type == "dir" {
tree, err := arch.ImportDir(dir)
if err != nil {
return nil, nil, err
}
blob, err := arch.SaveJSON(backend.Tree, tree)
if err != nil {
return nil, nil, err
}
node.Subtree = blob.ID
} else if node.Type == "file" {
_, err := arch.SaveFile(node)
if err != nil {
return nil, nil, err
}
}
blob, err := arch.SaveJSON(backend.Tree, &Tree{node})
if err != nil {
return nil, nil, err
}
sn.Content = blob.ID
// save snapshot
sn.StorageMap = arch.smap
blob, err = arch.SaveJSON(backend.Snapshot, sn)
if err != nil {
return nil, nil, err
}
return sn, blob, nil
}