mirror of
https://github.com/restic/restic.git
synced 2024-12-22 15:57:07 +00:00
383 lines
8.4 KiB
Go
383 lines
8.4 KiB
Go
package restic
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"os"
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"sync"
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"github.com/juju/arrar"
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"github.com/restic/restic/backend"
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"github.com/restic/restic/chunker"
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"github.com/restic/restic/debug"
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)
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const (
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maxConcurrentFiles = 16
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maxConcurrentBlobs = 16
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// chunkerBufSize is used in pool.go
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chunkerBufSize = 512 * chunker.KiB
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)
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type Archiver struct {
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s Server
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m *Map
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fileToken chan struct{}
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blobToken chan struct{}
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Error func(dir string, fi os.FileInfo, err error) error
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Filter func(item string, fi os.FileInfo) bool
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p *Progress
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}
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func NewArchiver(s Server, p *Progress) (*Archiver, error) {
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var err error
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arch := &Archiver{
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s: s,
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p: p,
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fileToken: make(chan struct{}, maxConcurrentFiles),
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blobToken: make(chan struct{}, maxConcurrentBlobs),
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}
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// fill file and blob token
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for i := 0; i < maxConcurrentFiles; i++ {
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arch.fileToken <- struct{}{}
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}
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for i := 0; i < maxConcurrentBlobs; i++ {
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arch.blobToken <- struct{}{}
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}
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// create new map to store all blobs in
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arch.m = NewMap()
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// abort on all errors
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arch.Error = func(string, os.FileInfo, error) error { return err }
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// allow all files
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arch.Filter = func(string, os.FileInfo) bool { return true }
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return arch, nil
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}
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func (arch *Archiver) Save(t backend.Type, id backend.ID, length uint, rd io.Reader) (Blob, error) {
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debug.Log("Archiver.Save", "Save(%v, %v)\n", t, id.Str())
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// test if this blob is already known
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blob, err := arch.m.FindID(id)
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if err == nil {
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debug.Log("Archiver.Save", "Save(%v, %v): reusing %v\n", t, id.Str(), blob.Storage.Str())
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id.Free()
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return blob, nil
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}
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// else encrypt and save data
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blob, err = arch.s.SaveFrom(t, id, length, rd)
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// store blob in storage map
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smapblob := arch.m.Insert(blob)
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// if the map has a different storage id for this plaintext blob, use that
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// one and remove the other. This happens if the same plaintext blob was
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// stored concurrently and finished earlier than this blob.
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if blob.Storage.Compare(smapblob.Storage) != 0 {
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debug.Log("Archiver.Save", "using other block, removing %v\n", blob.Storage.Str())
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// remove the blob again
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// TODO: implement a list of blobs in transport, so this doesn't happen so often
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err = arch.s.Remove(t, blob.Storage)
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if err != nil {
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return Blob{}, err
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}
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}
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debug.Log("Archiver.Save", "Save(%v, %v): new blob %v\n", t, id.Str(), blob)
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return smapblob, nil
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}
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func (arch *Archiver) SaveTreeJSON(item interface{}) (Blob, error) {
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// convert to json
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data, err := json.Marshal(item)
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if err != nil {
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return Blob{}, err
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}
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// check if tree has been saved before
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buf := backend.Compress(data)
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id := backend.Hash(buf)
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blob, err := arch.m.FindID(id)
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// return the blob if we found it
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if err == nil {
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return blob, nil
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}
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// otherwise save the data
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blob, err = arch.s.Save(backend.Tree, buf, id)
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if err != nil {
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return Blob{}, err
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}
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// store blob in storage map
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arch.m.Insert(blob)
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return blob, nil
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}
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// SaveFile stores the content of the file on the backend as a Blob by calling
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// Save for each chunk.
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func (arch *Archiver) SaveFile(node *Node) (Blobs, error) {
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file, err := os.Open(node.path)
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defer file.Close()
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if err != nil {
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return nil, err
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}
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// check file again
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fi, err := file.Stat()
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if err != nil {
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return nil, err
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}
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if fi.ModTime() != node.ModTime {
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e2 := arch.Error(node.path, fi, errors.New("file was updated, using new version"))
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if e2 == nil {
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// create new node
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n, err := NodeFromFileInfo(node.path, fi)
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if err != nil {
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return nil, err
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}
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// copy node
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*node = *n
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}
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}
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var blobs Blobs
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// store all chunks
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chnker := GetChunker("archiver.SaveFile")
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chnker.Reset(file)
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chans := [](<-chan Blob){}
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defer FreeChunker("archiver.SaveFile", chnker)
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chunks := 0
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for {
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buf := GetChunkBuf("blob chunker")
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chunk, err := chnker.Next()
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if err == io.EOF {
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FreeChunkBuf("blob chunker", buf)
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break
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}
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if err != nil {
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FreeChunkBuf("blob chunker", buf)
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return nil, arrar.Annotate(err, "SaveFile() chunker.Next()")
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}
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chunks++
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// acquire token, start goroutine to save chunk
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token := <-arch.blobToken
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resCh := make(chan Blob, 1)
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go func(ch chan<- Blob) {
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blob, err := arch.Save(backend.Data, chunk.Digest, chunk.Length, chunk.Reader(file))
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// TODO handle error
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if err != nil {
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panic(err)
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}
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FreeChunkBuf("blob chunker", buf)
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arch.p.Report(Stat{Bytes: blob.Size})
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arch.blobToken <- token
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ch <- blob
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}(resCh)
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chans = append(chans, resCh)
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}
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blobs = []Blob{}
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for _, ch := range chans {
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blobs = append(blobs, <-ch)
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}
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if len(blobs) != chunks {
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return nil, fmt.Errorf("chunker returned %v chunks, but only %v blobs saved", chunks, len(blobs))
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}
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var bytes uint64
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node.Content = make([]backend.ID, len(blobs))
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debug.Log("Archiver.Save", "checking size for file %s", node.path)
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for i, blob := range blobs {
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node.Content[i] = blob.ID
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bytes += blob.Size
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debug.Log("Archiver.Save", " adding blob %s", blob)
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}
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if bytes != node.Size {
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return nil, fmt.Errorf("errors saving node %q: saved %d bytes, wanted %d bytes", node.path, bytes, node.Size)
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}
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debug.Log("Archiver.SaveFile", "SaveFile(%q): %v\n", node.path, blobs)
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return blobs, nil
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}
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func (arch *Archiver) saveTree(t *Tree) (Blob, error) {
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debug.Log("Archiver.saveTree", "saveTree(%v)\n", t)
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var wg sync.WaitGroup
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// add all blobs to global map
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arch.m.Merge(t.Map)
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// TODO: do all this in parallel
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for _, node := range t.Nodes {
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if node.tree != nil {
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b, err := arch.saveTree(node.tree)
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if err != nil {
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return Blob{}, err
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}
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node.Subtree = b.ID
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t.Map.Insert(b)
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arch.p.Report(Stat{Dirs: 1})
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} else if node.Type == "file" {
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if len(node.Content) > 0 {
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removeContent := false
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// check content
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for _, id := range node.Content {
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blob, err := t.Map.FindID(id)
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if err != nil {
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debug.Log("Archiver.saveTree", "unable to find storage id for data blob %v", id.Str())
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arch.Error(node.path, nil, fmt.Errorf("unable to find storage id for data blob %v", id.Str()))
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removeContent = true
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t.Map.DeleteID(id)
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arch.m.DeleteID(id)
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continue
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}
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if ok, err := arch.s.Test(backend.Data, blob.Storage); !ok || err != nil {
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debug.Log("Archiver.saveTree", "blob %v not in repository (error is %v)", blob, err)
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arch.Error(node.path, nil, fmt.Errorf("blob %v not in repository (error is %v)", blob.Storage.Str(), err))
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removeContent = true
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t.Map.DeleteID(id)
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arch.m.DeleteID(id)
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}
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}
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if removeContent {
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debug.Log("Archiver.saveTree", "removing content for %s", node.path)
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node.Content = node.Content[:0]
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}
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}
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if len(node.Content) == 0 {
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// get token
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token := <-arch.fileToken
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// start goroutine
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wg.Add(1)
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go func(n *Node) {
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defer wg.Done()
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defer func() {
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arch.fileToken <- token
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}()
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var blobs Blobs
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blobs, n.err = arch.SaveFile(n)
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for _, b := range blobs {
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t.Map.Insert(b)
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}
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arch.p.Report(Stat{Files: 1})
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}(node)
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}
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}
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}
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wg.Wait()
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usedIDs := backend.NewIDSet()
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// check for invalid file nodes
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for _, node := range t.Nodes {
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if node.Type == "file" && node.Content == nil && node.err == nil {
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return Blob{}, fmt.Errorf("node %v has empty content", node.Name)
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}
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// remember used hashes
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if node.Type == "file" && node.Content != nil {
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for _, id := range node.Content {
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usedIDs.Insert(id)
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}
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}
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if node.Type == "dir" && node.Subtree != nil {
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usedIDs.Insert(node.Subtree)
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}
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if node.err != nil {
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err := arch.Error(node.path, nil, node.err)
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if err != nil {
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return Blob{}, err
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}
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// save error message in node
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node.Error = node.err.Error()
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}
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}
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before := len(t.Map.IDs())
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t.Map.Prune(usedIDs)
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after := len(t.Map.IDs())
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if before != after {
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debug.Log("Archiver.saveTree", "pruned %d ids from map for tree %v\n", before-after, t)
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}
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blob, err := arch.SaveTreeJSON(t)
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if err != nil {
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return Blob{}, err
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}
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return blob, nil
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}
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func (arch *Archiver) Snapshot(dir string, t *Tree, parentSnapshot backend.ID) (*Snapshot, backend.ID, error) {
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debug.Break("Archiver.Snapshot")
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arch.p.Start()
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defer arch.p.Done()
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sn, err := NewSnapshot(dir)
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if err != nil {
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return nil, nil, err
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}
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sn.Parent = parentSnapshot
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blob, err := arch.saveTree(t)
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if err != nil {
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return nil, nil, err
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}
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sn.Tree = blob
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// save snapshot
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blob, err = arch.s.SaveJSON(backend.Snapshot, sn)
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if err != nil {
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return nil, nil, err
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}
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return sn, blob.Storage, nil
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}
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