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Merge pull request #2217 from restic/improve-memory-usage

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WIP: improve memory usage
This commit is contained in:
Alexander Neumann 2019-04-13 15:07:07 +02:00
commit 6b700d02f5
17 changed files with 417 additions and 526 deletions
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6
cmd/restic/cmd_cat.go
View file

@ -74,7 +74,7 @@ func runCat(gopts GlobalOptions, args []string) error {
fmt.Println(string(buf))
return nil
case "index":
buf, err := repo.LoadAndDecrypt(gopts.ctx, restic.IndexFile, id)
buf, err := repo.LoadAndDecrypt(gopts.ctx, nil, restic.IndexFile, id)
if err != nil {
return err
}
@ -99,7 +99,7 @@ func runCat(gopts GlobalOptions, args []string) error {
return nil
case "key":
h := restic.Handle{Type: restic.KeyFile, Name: id.String()}
buf, err := backend.LoadAll(gopts.ctx, repo.Backend(), h)
buf, err := backend.LoadAll(gopts.ctx, nil, repo.Backend(), h)
if err != nil {
return err
}
@ -150,7 +150,7 @@ func runCat(gopts GlobalOptions, args []string) error {
switch tpe {
case "pack":
h := restic.Handle{Type: restic.DataFile, Name: id.String()}
buf, err := backend.LoadAll(gopts.ctx, repo.Backend(), h)
buf, err := backend.LoadAll(gopts.ctx, nil, repo.Backend(), h)
if err != nil {
return err
}

10
internal/backend/test/tests.go
View file

@ -79,7 +79,7 @@ func (s *Suite) TestConfig(t *testing.T) {
var testString = "Config"
// create config and read it back
_, err := backend.LoadAll(context.TODO(), b, restic.Handle{Type: restic.ConfigFile})
_, err := backend.LoadAll(context.TODO(), nil, b, restic.Handle{Type: restic.ConfigFile})
if err == nil {
t.Fatalf("did not get expected error for non-existing config")
}
@ -93,7 +93,7 @@ func (s *Suite) TestConfig(t *testing.T) {
// same config
for _, name := range []string{"", "foo", "bar", "0000000000000000000000000000000000000000000000000000000000000000"} {
h := restic.Handle{Type: restic.ConfigFile, Name: name}
buf, err := backend.LoadAll(context.TODO(), b, h)
buf, err := backend.LoadAll(context.TODO(), nil, b, h)
if err != nil {
t.Fatalf("unable to read config with name %q: %+v", name, err)
}
@ -491,7 +491,7 @@ func (s *Suite) TestSave(t *testing.T) {
err := b.Save(context.TODO(), h, restic.NewByteReader(data))
test.OK(t, err)
buf, err := backend.LoadAll(context.TODO(), b, h)
buf, err := backend.LoadAll(context.TODO(), nil, b, h)
test.OK(t, err)
if len(buf) != len(data) {
t.Fatalf("number of bytes does not match, want %v, got %v", len(data), len(buf))
@ -584,7 +584,7 @@ func (s *Suite) TestSaveFilenames(t *testing.T) {
continue
}
buf, err := backend.LoadAll(context.TODO(), b, h)
buf, err := backend.LoadAll(context.TODO(), nil, b, h)
if err != nil {
t.Errorf("test %d failed: Load() returned %+v", i, err)
continue
@ -734,7 +734,7 @@ func (s *Suite) TestBackend(t *testing.T) {
// test Load()
h := restic.Handle{Type: tpe, Name: ts.id}
buf, err := backend.LoadAll(context.TODO(), b, h)
buf, err := backend.LoadAll(context.TODO(), nil, b, h)
test.OK(t, err)
test.Equals(t, ts.data, string(buf))

27
internal/backend/utils.go
View file

@ -1,20 +1,33 @@
package backend
import (
"bytes"
"context"
"io"
"io/ioutil"
"github.com/restic/restic/internal/restic"
)
// LoadAll reads all data stored in the backend for the handle.
func LoadAll(ctx context.Context, be restic.Backend, h restic.Handle) (buf []byte, err error) {
err = be.Load(ctx, h, 0, 0, func(rd io.Reader) (ierr error) {
buf, ierr = ioutil.ReadAll(rd)
return ierr
// LoadAll reads all data stored in the backend for the handle into the given
// buffer, which is truncated. If the buffer is not large enough or nil, a new
// one is allocated.
func LoadAll(ctx context.Context, buf []byte, be restic.Backend, h restic.Handle) ([]byte, error) {
err := be.Load(ctx, h, 0, 0, func(rd io.Reader) error {
// make sure this is idempotent, in case an error occurs this function may be called multiple times!
wr := bytes.NewBuffer(buf[:0])
_, cerr := io.Copy(wr, rd)
if cerr != nil {
return cerr
}
buf = wr.Bytes()
return nil
})
return buf, err
if err != nil {
return nil, err
}
return buf, nil
}
// LimitedReadCloser wraps io.LimitedReader and exposes the Close() method.

96
internal/backend/utils_test.go
View file

@ -19,6 +19,7 @@ const MiB = 1 << 20
func TestLoadAll(t *testing.T) {
b := mem.New()
var buf []byte
for i := 0; i < 20; i++ {
data := rtest.Random(23+i, rand.Intn(MiB)+500*KiB)
@ -28,7 +29,7 @@ func TestLoadAll(t *testing.T) {
err := b.Save(context.TODO(), h, restic.NewByteReader(data))
rtest.OK(t, err)
buf, err := backend.LoadAll(context.TODO(), b, restic.Handle{Type: restic.DataFile, Name: id.String()})
buf, err := backend.LoadAll(context.TODO(), buf, b, restic.Handle{Type: restic.DataFile, Name: id.String()})
rtest.OK(t, err)
if len(buf) != len(data) {
@ -43,55 +44,66 @@ func TestLoadAll(t *testing.T) {
}
}
func TestLoadSmallBuffer(t *testing.T) {
b := mem.New()
for i := 0; i < 20; i++ {
data := rtest.Random(23+i, rand.Intn(MiB)+500*KiB)
id := restic.Hash(data)
h := restic.Handle{Name: id.String(), Type: restic.DataFile}
err := b.Save(context.TODO(), h, restic.NewByteReader(data))
rtest.OK(t, err)
buf, err := backend.LoadAll(context.TODO(), b, restic.Handle{Type: restic.DataFile, Name: id.String()})
rtest.OK(t, err)
if len(buf) != len(data) {
t.Errorf("length of returned buffer does not match, want %d, got %d", len(data), len(buf))
continue
}
if !bytes.Equal(buf, data) {
t.Errorf("wrong data returned")
continue
}
func save(t testing.TB, be restic.Backend, buf []byte) restic.Handle {
id := restic.Hash(buf)
h := restic.Handle{Name: id.String(), Type: restic.DataFile}
err := be.Save(context.TODO(), h, restic.NewByteReader(buf))
if err != nil {
t.Fatal(err)
}
return h
}
func TestLoadLargeBuffer(t *testing.T) {
func TestLoadAllAppend(t *testing.T) {
b := mem.New()
for i := 0; i < 20; i++ {
data := rtest.Random(23+i, rand.Intn(MiB)+500*KiB)
h1 := save(t, b, []byte("foobar test string"))
randomData := rtest.Random(23, rand.Intn(MiB)+500*KiB)
h2 := save(t, b, randomData)
id := restic.Hash(data)
h := restic.Handle{Name: id.String(), Type: restic.DataFile}
err := b.Save(context.TODO(), h, restic.NewByteReader(data))
rtest.OK(t, err)
var tests = []struct {
handle restic.Handle
buf []byte
want []byte
}{
{
handle: h1,
buf: nil,
want: []byte("foobar test string"),
},
{
handle: h1,
buf: []byte("xxx"),
want: []byte("foobar test string"),
},
{
handle: h2,
buf: nil,
want: randomData,
},
{
handle: h2,
buf: make([]byte, 0, 200),
want: randomData,
},
{
handle: h2,
buf: []byte("foobarbaz"),
want: randomData,
},
}
buf, err := backend.LoadAll(context.TODO(), b, restic.Handle{Type: restic.DataFile, Name: id.String()})
rtest.OK(t, err)
for _, test := range tests {
t.Run("", func(t *testing.T) {
buf, err := backend.LoadAll(context.TODO(), test.buf, b, test.handle)
if err != nil {
t.Fatal(err)
}
if len(buf) != len(data) {
t.Errorf("length of returned buffer does not match, want %d, got %d", len(data), len(buf))
continue
}
if !bytes.Equal(buf, data) {
t.Errorf("wrong data returned")
continue
}
if !bytes.Equal(buf, test.want) {
t.Errorf("wrong data returned, want %q, got %q", test.want, buf)
}
})
}
}

4
internal/cache/backend_test.go vendored
View file

@ -17,7 +17,7 @@ import (
)
func loadAndCompare(t testing.TB, be restic.Backend, h restic.Handle, data []byte) {
buf, err := backend.LoadAll(context.TODO(), be, h)
buf, err := backend.LoadAll(context.TODO(), nil, be, h)
if err != nil {
t.Fatal(err)
}
@ -147,7 +147,7 @@ func TestErrorBackend(t *testing.T) {
loadTest := func(wg *sync.WaitGroup, be restic.Backend) {
defer wg.Done()
buf, err := backend.LoadAll(context.TODO(), be, h)
buf, err := backend.LoadAll(context.TODO(), nil, be, h)
if err == testErr {
return
}

213
internal/checker/checker.go
View file

@ -49,7 +49,7 @@ func New(repo restic.Repository) *Checker {
return c
}
const defaultParallelism = 40
const defaultParallelism = 5
// ErrDuplicatePacks is returned when a pack is found in more than one index.
type ErrDuplicatePacks struct {
@ -74,82 +74,110 @@ func (err ErrOldIndexFormat) Error() string {
// LoadIndex loads all index files.
func (c *Checker) LoadIndex(ctx context.Context) (hints []error, errs []error) {
debug.Log("Start")
type indexRes struct {
Index *repository.Index
err error
ID string
// track spawned goroutines using wg, create a new context which is
// cancelled as soon as an error occurs.
wg, ctx := errgroup.WithContext(ctx)
type FileInfo struct {
restic.ID
Size int64
}
indexCh := make(chan indexRes)
type Result struct {
*repository.Index
restic.ID
Err error
}
worker := func(ctx context.Context, id restic.ID) error {
debug.Log("worker got index %v", id)
idx, err := repository.LoadIndexWithDecoder(ctx, c.repo, id, repository.DecodeIndex)
if errors.Cause(err) == repository.ErrOldIndexFormat {
debug.Log("index %v has old format", id)
hints = append(hints, ErrOldIndexFormat{id})
ch := make(chan FileInfo)
resultCh := make(chan Result)
idx, err = repository.LoadIndexWithDecoder(ctx, c.repo, id, repository.DecodeOldIndex)
// send list of index files through ch, which is closed afterwards
wg.Go(func() error {
defer close(ch)
return c.repo.List(ctx, restic.IndexFile, func(id restic.ID, size int64) error {
select {
case <-ctx.Done():
return nil
case ch <- FileInfo{id, size}:
}
return nil
})
})
// a worker receives an index ID from ch, loads the index, and sends it to indexCh
worker := func() error {
var buf []byte
for fi := range ch {
debug.Log("worker got file %v", fi.ID.Str())
var err error
var idx *repository.Index
idx, buf, err = repository.LoadIndexWithDecoder(ctx, c.repo, buf[:0], fi.ID, repository.DecodeIndex)
if errors.Cause(err) == repository.ErrOldIndexFormat {
debug.Log("index %v has old format", fi.ID.Str())
hints = append(hints, ErrOldIndexFormat{fi.ID})
idx, buf, err = repository.LoadIndexWithDecoder(ctx, c.repo, buf[:0], fi.ID, repository.DecodeOldIndex)
}
err = errors.Wrapf(err, "error loading index %v", fi.ID.Str())
select {
case resultCh <- Result{idx, fi.ID, err}:
case <-ctx.Done():
}
}
err = errors.Wrapf(err, "error loading index %v", id.Str())
select {
case indexCh <- indexRes{Index: idx, ID: id.String(), err: err}:
case <-ctx.Done():
}
return nil
}
go func() {
defer close(indexCh)
debug.Log("start loading indexes in parallel")
err := repository.FilesInParallel(ctx, c.repo.Backend(), restic.IndexFile, defaultParallelism,
repository.ParallelWorkFuncParseID(worker))
debug.Log("loading indexes finished, error: %v", err)
if err != nil {
panic(err)
}
}()
// final closes indexCh after all workers have terminated
final := func() error {
close(resultCh)
return nil
}
done := make(chan struct{})
defer close(done)
// run workers on ch
wg.Go(func() error {
return repository.RunWorkers(ctx, defaultParallelism, worker, final)
})
// receive decoded indexes
packToIndex := make(map[restic.ID]restic.IDSet)
wg.Go(func() error {
for res := range resultCh {
debug.Log("process index %v, err %v", res.ID, res.Err)
for res := range indexCh {
debug.Log("process index %v, err %v", res.ID, res.err)
if res.err != nil {
errs = append(errs, res.err)
continue
}
idxID, err := restic.ParseID(res.ID)
if err != nil {
errs = append(errs, errors.Errorf("unable to parse as index ID: %v", res.ID))
continue
}
c.indexes[idxID] = res.Index
c.masterIndex.Insert(res.Index)
debug.Log("process blobs")
cnt := 0
for blob := range res.Index.Each(ctx) {
c.packs.Insert(blob.PackID)
c.blobs.Insert(blob.ID)
c.blobRefs.M[blob.ID] = 0
cnt++
if _, ok := packToIndex[blob.PackID]; !ok {
packToIndex[blob.PackID] = restic.NewIDSet()
if res.Err != nil {
errs = append(errs, res.Err)
continue
}
packToIndex[blob.PackID].Insert(idxID)
}
debug.Log("%d blobs processed", cnt)
c.indexes[res.ID] = res.Index
c.masterIndex.Insert(res.Index)
debug.Log("process blobs")
cnt := 0
for blob := range res.Index.Each(ctx) {
c.packs.Insert(blob.PackID)
c.blobs.Insert(blob.ID)
c.blobRefs.M[blob.ID] = 0
cnt++
if _, ok := packToIndex[blob.PackID]; !ok {
packToIndex[blob.PackID] = restic.NewIDSet()
}
packToIndex[blob.PackID].Insert(res.ID)
}
debug.Log("%d blobs processed", cnt)
}
return nil
})
err := wg.Wait()
if err != nil {
errs = append(errs, err)
}
debug.Log("checking for duplicate packs")
@ -163,7 +191,7 @@ func (c *Checker) LoadIndex(ctx context.Context) (hints []error, errs []error) {
}
}
err := c.repo.SetIndex(c.masterIndex)
err = c.repo.SetIndex(c.masterIndex)
if err != nil {
debug.Log("SetIndex returned error: %v", err)
errs = append(errs, err)
@ -281,31 +309,52 @@ func loadSnapshotTreeIDs(ctx context.Context, repo restic.Repository) (restic.ID
sync.Mutex
}
snapshotWorker := func(ctx context.Context, strID string) error {
id, err := restic.ParseID(strID)
if err != nil {
return err
}
// track spawned goroutines using wg, create a new context which is
// cancelled as soon as an error occurs.
wg, ctx := errgroup.WithContext(ctx)
debug.Log("load snapshot %v", id)
ch := make(chan restic.ID)
treeID, err := loadTreeFromSnapshot(ctx, repo, id)
if err != nil {
errs.Lock()
errs.errs = append(errs.errs, err)
errs.Unlock()
// send list of index files through ch, which is closed afterwards
wg.Go(func() error {
defer close(ch)
return repo.List(ctx, restic.SnapshotFile, func(id restic.ID, size int64) error {
select {
case <-ctx.Done():
return nil
case ch <- id:
}
return nil
})
})
// a worker receives an index ID from ch, loads the snapshot and the tree,
// and adds the result to errs and trees.
worker := func() error {
for id := range ch {
debug.Log("load snapshot %v", id)
treeID, err := loadTreeFromSnapshot(ctx, repo, id)
if err != nil {
errs.Lock()
errs.errs = append(errs.errs, err)
errs.Unlock()
continue
}
debug.Log("snapshot %v has tree %v", id, treeID)
trees.Lock()
trees.IDs = append(trees.IDs, treeID)
trees.Unlock()
}
debug.Log("snapshot %v has tree %v", id, treeID)
trees.Lock()
trees.IDs = append(trees.IDs, treeID)
trees.Unlock()
return nil
}
err := repository.FilesInParallel(ctx, repo.Backend(), restic.SnapshotFile, defaultParallelism, snapshotWorker)
for i := 0; i < defaultParallelism; i++ {
wg.Go(worker)
}
err := wg.Wait()
if err != nil {
errs.errs = append(errs.errs, err)
}

141
internal/mock/repository.go
View file

@ -1,141 +0,0 @@
package mock
import (
"github.com/restic/restic/internal/crypto"
"github.com/restic/restic/internal/restic"
)
// Repository implements a mock Repository.
type Repository struct {
BackendFn func() restic.Backend
KeyFn func() *crypto.Key
SetIndexFn func(restic.Index) error
IndexFn func() restic.Index
SaveFullIndexFn func() error
SaveIndexFn func() error
LoadIndexFn func() error
ConfigFn func() restic.Config
LookupBlobSizeFn func(restic.ID, restic.BlobType) (uint, error)
ListFn func(restic.FileType, <-chan struct{}) <-chan restic.ID
ListPackFn func(restic.ID) ([]restic.Blob, int64, error)
FlushFn func() error
SaveUnpackedFn func(restic.FileType, []byte) (restic.ID, error)
SaveJSONUnpackedFn func(restic.FileType, interface{}) (restic.ID, error)
LoadJSONUnpackedFn func(restic.FileType, restic.ID, interface{}) error
LoadAndDecryptFn func(restic.FileType, restic.ID) ([]byte, error)
LoadBlobFn func(restic.BlobType, restic.ID, []byte) (int, error)
SaveBlobFn func(restic.BlobType, []byte, restic.ID) (restic.ID, error)
LoadTreeFn func(restic.ID) (*restic.Tree, error)
SaveTreeFn func(t *restic.Tree) (restic.ID, error)
}
// Backend is a stub method.
func (repo Repository) Backend() restic.Backend {
return repo.BackendFn()
}
// Key is a stub method.
func (repo Repository) Key() *crypto.Key {
return repo.KeyFn()
}
// SetIndex is a stub method.
func (repo Repository) SetIndex(idx restic.Index) error {
return repo.SetIndexFn(idx)
}
// Index is a stub method.
func (repo Repository) Index() restic.Index {
return repo.IndexFn()
}
// SaveFullIndex is a stub method.
func (repo Repository) SaveFullIndex() error {
return repo.SaveFullIndexFn()
}
// SaveIndex is a stub method.
func (repo Repository) SaveIndex() error {
return repo.SaveIndexFn()
}
// LoadIndex is a stub method.
func (repo Repository) LoadIndex() error {
return repo.LoadIndexFn()
}
// Config is a stub method.
func (repo Repository) Config() restic.Config {
return repo.ConfigFn()
}
// LookupBlobSize is a stub method.
func (repo Repository) LookupBlobSize(id restic.ID, t restic.BlobType) (uint, error) {
return repo.LookupBlobSizeFn(id, t)
}
// List is a stub method.
func (repo Repository) List(t restic.FileType, done <-chan struct{}) <-chan restic.ID {
return repo.ListFn(t, done)
}
// ListPack is a stub method.
func (repo Repository) ListPack(id restic.ID) ([]restic.Blob, int64, error) {
return repo.ListPackFn(id)
}
// Flush is a stub method.
func (repo Repository) Flush() error {
return repo.FlushFn()
}
// SaveUnpacked is a stub method.
func (repo Repository) SaveUnpacked(t restic.FileType, buf []byte) (restic.ID, error) {
return repo.SaveUnpackedFn(t, buf)
}
// SaveJSONUnpacked is a stub method.
func (repo Repository) SaveJSONUnpacked(t restic.FileType, item interface{}) (restic.ID, error) {
return repo.SaveJSONUnpackedFn(t, item)
}
// LoadJSONUnpacked is a stub method.
func (repo Repository) LoadJSONUnpacked(t restic.FileType, id restic.ID, item interface{}) error {
return repo.LoadJSONUnpackedFn(t, id, item)
}
// LoadAndDecrypt is a stub method.
func (repo Repository) LoadAndDecrypt(t restic.FileType, id restic.ID) ([]byte, error) {
return repo.LoadAndDecryptFn(t, id)
}
// LoadBlob is a stub method.
func (repo Repository) LoadBlob(t restic.BlobType, id restic.ID, buf []byte) (int, error) {
return repo.LoadBlobFn(t, id, buf)
}
// SaveBlob is a stub method.
func (repo Repository) SaveBlob(t restic.BlobType, buf []byte, id restic.ID) (restic.ID, error) {
return repo.SaveBlobFn(t, buf, id)
}
// LoadTree is a stub method.
func (repo Repository) LoadTree(id restic.ID) (*restic.Tree, error) {
return repo.LoadTreeFn(id)
}
// SaveTree is a stub method.
func (repo Repository) SaveTree(t *restic.Tree) (restic.ID, error) {
return repo.SaveTreeFn(t)
}

12
internal/repository/index.go
View file

@ -549,21 +549,21 @@ func DecodeOldIndex(buf []byte) (idx *Index, err error) {
}
// LoadIndexWithDecoder loads the index and decodes it with fn.
func LoadIndexWithDecoder(ctx context.Context, repo restic.Repository, id restic.ID, fn func([]byte) (*Index, error)) (idx *Index, err error) {
func LoadIndexWithDecoder(ctx context.Context, repo restic.Repository, buf []byte, id restic.ID, fn func([]byte) (*Index, error)) (*Index, []byte, error) {
debug.Log("Loading index %v", id)
buf, err := repo.LoadAndDecrypt(ctx, restic.IndexFile, id)
buf, err := repo.LoadAndDecrypt(ctx, buf[:0], restic.IndexFile, id)
if err != nil {
return nil, err
return nil, buf[:0], err
}
idx, err = fn(buf)
idx, err := fn(buf)
if err != nil {
debug.Log("error while decoding index %v: %v", id, err)
return nil, err
return nil, buf[:0], err
}
idx.id = id
return idx, nil
return idx, buf, nil
}

2
internal/repository/key.go
View file

@ -184,7 +184,7 @@ func SearchKey(ctx context.Context, s *Repository, password string, maxKeys int,
// LoadKey loads a key from the backend.
func LoadKey(ctx context.Context, s *Repository, name string) (k *Key, err error) {
h := restic.Handle{Type: restic.KeyFile, Name: name}
data, err := backend.LoadAll(ctx, s.be, h)
data, err := backend.LoadAll(ctx, nil, s.be, h)
if err != nil {
return nil, err
}

65
internal/repository/parallel.go
View file

@ -1,65 +0,0 @@
package repository
import (
"context"
"github.com/restic/restic/internal/debug"
"github.com/restic/restic/internal/restic"
"golang.org/x/sync/errgroup"
)
// ParallelWorkFunc gets one file ID to work on. If an error is returned,
// processing stops. When the contect is cancelled the function should return.
type ParallelWorkFunc func(ctx context.Context, id string) error
// ParallelIDWorkFunc gets one restic.ID to work on. If an error is returned,
// processing stops. When the context is cancelled the function should return.
type ParallelIDWorkFunc func(ctx context.Context, id restic.ID) error
// FilesInParallel runs n workers of f in parallel, on the IDs that
// repo.List(t) yields. If f returns an error, the process is aborted and the
// first error is returned.
func FilesInParallel(ctx context.Context, repo restic.Lister, t restic.FileType, n int, f ParallelWorkFunc) error {
g, ctx := errgroup.WithContext(ctx)
ch := make(chan string, n)
g.Go(func() error {
defer close(ch)
return repo.List(ctx, t, func(fi restic.FileInfo) error {
select {
case <-ctx.Done():
case ch <- fi.Name:
}
return nil
})
})
for i := 0; i < n; i++ {
g.Go(func() error {
for name := range ch {
err := f(ctx, name)
if err != nil {
return err
}
}
return nil
})
}
return g.Wait()
}
// ParallelWorkFuncParseID converts a function that takes a restic.ID to a
// function that takes a string. Filenames that do not parse as a restic.ID
// are ignored.
func ParallelWorkFuncParseID(f ParallelIDWorkFunc) ParallelWorkFunc {
return func(ctx context.Context, s string) error {
id, err := restic.ParseID(s)
if err != nil {
debug.Log("invalid ID %q: %v", id, err)
return nil
}
return f(ctx, id)
}
}

129
internal/repository/parallel_test.go
View file

@ -1,129 +0,0 @@
package repository_test
import (
"context"
"math/rand"
"testing"
"time"
"github.com/restic/restic/internal/errors"
"github.com/restic/restic/internal/restic"
"github.com/restic/restic/internal/repository"
rtest "github.com/restic/restic/internal/test"
)
type testIDs []string
var lister = testIDs{
"40bb581cd36de952985c97a3ff6b21df41ee897d4db2040354caa36a17ff5268",
"2e15811a4d14ffac66d36a9ff456019d8de4c10c949d45b643f8477d17e92ff3",
"70c11b3ed521ad6b76d905c002ca98b361fca06aca060a063432c7311155a4da",
"8056a33e75dccdda701b6c989c7ed0cb71bbb6da13c6427fe5986f0896cc91c0",
"79d8776200596aa0237b10d470f7b850b86f8a1a80988ef5c8bee2874ce992e2",
"f9f1f29791c6b79b90b35efd083f17a3b163bbbafb1a2fdf43d46d56cffda289",
"3834178d05d0f6dd07f872ee0262ff1ace0f0f375768227d3c902b0b66591369",
"66d5cc68c9186414806f366ae5493ce7f229212993750a4992be4030f6af28c5",
"ebca5af4f397944f68cd215e3dfa2b197a7ba0f7c17d65d9f7390d0a15cde296",
"d4511ce6ff732d106275a57e40745c599e987c0da44c42cddbef592aac102437",
"f366202f0bfeefaedd7b49e2f21a90d3cbddb97d257a74d788dd34e19a684dae",
"a5c17728ab2433cd50636dd5c6c7068c7a44f2999d09c46e8f528466da8a059d",
"bae0f9492b9b208233029b87692a1a55cbd7fbe1cf3f6d7bc693ac266a6d6f0e",
"9d500187913c7510d71d1902703d312c7aaa56f1e98351385b9535fdabae595e",
"ffbddd8a4c1e54d258bb3e16d3929b546b61af63cb560b3e3061a8bef5b24552",
"201bb3abf655e7ef71e79ed4fb1079b0502b5acb4d9fad5e72a0de690c50a386",
"08eb57bbd559758ea96e99f9b7688c30e7b3bcf0c4562ff4535e2d8edeffaeed",
"e50b7223b04985ff38d9e11d1cba333896ef4264f82bd5d0653a028bce70e542",
"65a9421cd59cc7b7a71dcd9076136621af607fb4701d2e5c2af23b6396cf2f37",
"995a655b3521c19b4d0c266222266d89c8fc62889597d61f45f336091e646d57",
"51ec6f0bce77ed97df2dd7ae849338c3a8155a057da927eedd66e3d61be769ad",
"7b3923a0c0666431efecdbf6cb171295ec1710b6595eebcba3b576b49d13e214",
"2cedcc3d14698bea7e4b0546f7d5d48951dd90add59e6f2d44b693fd8913717d",
"fd6770cbd54858fdbd3d7b4239b985e5599180064d93ca873f27e86e8407d011",
"9edc51d8e6e04d05c9757848c1bfbfdc8e86b6330982294632488922e59fdb1b",
"1a6c4fbb24ad724c968b2020417c3d057e6c89e49bdfb11d91006def65eab6a0",
"cb3b29808cd0adfa2dca1f3a04f98114fbccf4eb487cdd4022f49bd70eeb049b",
"f55edcb40c619e29a20e432f8aaddc83a649be2c2d1941ccdc474cd2af03d490",
"e8ccc1763a92de23566b95c3ad1414a098016ece69a885fc8a72782a7517d17c",
"0fe2e3db8c5a12ad7101a63a0fffee901be54319cfe146bead7aec851722f82d",
"36be45a6ae7c95ad97cee1b33023be324bce7a7b4b7036e24125679dd9ff5b44",
"1685ed1a57c37859fbef1f7efb7509f20b84ec17a765605de43104d2fa37884b",
"9d83629a6a004c505b100a0b5d0b246833b63aa067aa9b59e3abd6b74bc4d3a8",
"be49a66b60175c5e2ee273b42165f86ef11bb6518c1c79950bcd3f4c196c98bd",
"0fd89885d821761b4a890782908e75793028747d15ace3c6cbf0ad56582b4fa5",
"94a767519a4e352a88796604943841fea21429f3358b4d5d55596dbda7d15dce",
"8dd07994afe6e572ddc9698fb0d13a0d4c26a38b7992818a71a99d1e0ac2b034",
"f7380a6f795ed31fbeb2945c72c5fd1d45044e5ab152311e75e007fa530f5847",
"5ca1ce01458e484393d7e9c8af42b0ff37a73a2fee0f18e14cff0fb180e33014",
"8f44178be3fe0a2bd41f922576fb7a9b19d589754504be746f56c759df328fda",
"12d33847c2be711c989f37360dd7aa8537fd14972262a4530634a08fdf32a767",
"31e077f5080f78846a00093caff2b6b839519cc47516142eeba9c41d4072a605",
"14f01db8a0054e70222b76d2555d70114b4bf8a0f02084324af2df226f14a795",
"7f5dbbaf31b4551828e8e76cef408375db9fbcdcdb6b5949f2d1b0c4b8632132",
"42a5d9b9bb7e4a16f23ba916bcf87f38c1aa1f2de2ab79736f725850a8ff6a1b",
"e06f8f901ea708beba8712a11b6e2d0be7c4b018d0254204ef269bcdf5e8c6cc",
"d9ba75785bf45b0c4fd3b2365c968099242483f2f0d0c7c20306dac11fae96e9",
"428debbb280873907cef2ec099efe1566e42a59775d6ec74ded0c4048d5a6515",
"3b51049d4dae701098e55a69536fa31ad2be1adc17b631a695a40e8a294fe9c0",
"168f88aa4b105e9811f5f79439cc1a689be4eec77f3361d42f22fe8f7ddc74a9",
"0baa0ab2249b33d64449a899cb7bd8eae5231f0d4ff70f09830dc1faa2e4abee",
"0c3896d346b580306a49de29f3a78913a41e14b8461b124628c33a64636241f2",
"b18313f1651c15e100e7179aa3eb8ffa62c3581159eaf7f83156468d19781e42",
"996361f7d988e48267ccc7e930fed4637be35fe7562b8601dceb7a32313a14c8",
"dfb4e6268437d53048d22b811048cd045df15693fc6789affd002a0fc80a6e60",
"34dd044c228727f2226a0c9c06a3e5ceb5e30e31cb7854f8fa1cde846b395a58",
}
func (tests testIDs) List(ctx context.Context, t restic.FileType, fn func(restic.FileInfo) error) error {
for i := 0; i < 500; i++ {
for _, id := range tests {
if ctx.Err() != nil {
return ctx.Err()
}
fi := restic.FileInfo{
Name: id,
}
err := fn(fi)
if err != nil {
return err
}
}
}
return nil
}
func TestFilesInParallel(t *testing.T) {
f := func(ctx context.Context, id string) error {
time.Sleep(1 * time.Millisecond)
return nil
}
for n := 1; n < 5; n++ {
err := repository.FilesInParallel(context.TODO(), lister, restic.DataFile, n*100, f)
rtest.OK(t, err)
}
}
var errTest = errors.New("test error")
func TestFilesInParallelWithError(t *testing.T) {
f := func(ctx context.Context, id string) error {
time.Sleep(1 * time.Millisecond)
if rand.Float32() < 0.01 {
return errTest
}
return nil
}
for n := 1; n < 5; n++ {
err := repository.FilesInParallel(context.TODO(), lister, restic.DataFile, n*100, f)
if err != errTest {
t.Fatalf("wrong error returned, want %q, got %v", errTest, err)
}
}
}

124
internal/repository/repository.go
View file

@ -9,7 +9,6 @@ import (
"io"
"os"
"github.com/restic/restic/internal/backend"
"github.com/restic/restic/internal/cache"
"github.com/restic/restic/internal/crypto"
"github.com/restic/restic/internal/debug"
@ -18,6 +17,7 @@ import (
"github.com/restic/restic/internal/hashing"
"github.com/restic/restic/internal/pack"
"github.com/restic/restic/internal/restic"
"golang.org/x/sync/errgroup"
)
// Repository is used to access a repository in a backend.
@ -66,15 +66,29 @@ func (r *Repository) PrefixLength(t restic.FileType) (int, error) {
return restic.PrefixLength(r.be, t)
}
// LoadAndDecrypt loads and decrypts data identified by t and id from the
// backend.
func (r *Repository) LoadAndDecrypt(ctx context.Context, t restic.FileType, id restic.ID) (buf []byte, err error) {
// LoadAndDecrypt loads and decrypts the file with the given type and ID, using
// the supplied buffer (which must be empty). If the buffer is nil, a new
// buffer will be allocated and returned.
func (r *Repository) LoadAndDecrypt(ctx context.Context, buf []byte, t restic.FileType, id restic.ID) ([]byte, error) {
if len(buf) != 0 {
panic("buf is not empty")
}
debug.Log("load %v with id %v", t, id)
h := restic.Handle{Type: t, Name: id.String()}
buf, err = backend.LoadAll(ctx, r.be, h)
err := r.be.Load(ctx, h, 0, 0, func(rd io.Reader) error {
// make sure this call is idempotent, in case an error occurs
wr := bytes.NewBuffer(buf[:0])
_, cerr := io.Copy(wr, rd)
if cerr != nil {
return cerr
}
buf = wr.Bytes()
return nil
})
if err != nil {
debug.Log("error loading %v: %v", h, err)
return nil, err
}
@ -187,7 +201,7 @@ func (r *Repository) loadBlob(ctx context.Context, id restic.ID, t restic.BlobTy
// LoadJSONUnpacked decrypts the data and afterwards calls json.Unmarshal on
// the item.
func (r *Repository) LoadJSONUnpacked(ctx context.Context, t restic.FileType, id restic.ID, item interface{}) (err error) {
buf, err := r.LoadAndDecrypt(ctx, t, id)
buf, err := r.LoadAndDecrypt(ctx, nil, t, id)
if err != nil {
return err
}
@ -391,45 +405,86 @@ const loadIndexParallelism = 4
func (r *Repository) LoadIndex(ctx context.Context) error {
debug.Log("Loading index")
errCh := make(chan error, 1)
indexes := make(chan *Index)
// track spawned goroutines using wg, create a new context which is
// cancelled as soon as an error occurs.
wg, ctx := errgroup.WithContext(ctx)
worker := func(ctx context.Context, id restic.ID) error {
idx, err := LoadIndex(ctx, r, id)
if err != nil {
fmt.Fprintf(os.Stderr, "%v, ignoring\n", err)
type FileInfo struct {
restic.ID
Size int64
}
ch := make(chan FileInfo)
indexCh := make(chan *Index)
// send list of index files through ch, which is closed afterwards
wg.Go(func() error {
defer close(ch)
return r.List(ctx, restic.IndexFile, func(id restic.ID, size int64) error {
select {
case <-ctx.Done():
return nil
case ch <- FileInfo{id, size}:
}
return nil
}
})
})
select {
case indexes <- idx:
case <-ctx.Done():
// a worker receives an index ID from ch, loads the index, and sends it to indexCh
worker := func() error {
var buf []byte
for fi := range ch {
var err error
var idx *Index
idx, buf, err = LoadIndexWithDecoder(ctx, r, buf[:0], fi.ID, DecodeIndex)
if err != nil && errors.Cause(err) == ErrOldIndexFormat {
idx, buf, err = LoadIndexWithDecoder(ctx, r, buf[:0], fi.ID, DecodeOldIndex)
}
select {
case indexCh <- idx:
case <-ctx.Done():
}
}
return nil
}
go func() {
defer close(indexes)
errCh <- FilesInParallel(ctx, r.be, restic.IndexFile, loadIndexParallelism,
ParallelWorkFuncParseID(worker))
}()
validIndex := restic.NewIDSet()
for idx := range indexes {
id, err := idx.ID()
if err == nil {
validIndex.Insert(id)
}
r.idx.Insert(idx)
// final closes indexCh after all workers have terminated
final := func() error {
close(indexCh)
return nil
}
err := r.PrepareCache(validIndex)
// run workers on ch
wg.Go(func() error {
return RunWorkers(ctx, loadIndexParallelism, worker, final)
})
// receive decoded indexes
validIndex := restic.NewIDSet()
wg.Go(func() error {
for idx := range indexCh {
id, err := idx.ID()
if err == nil {
validIndex.Insert(id)
}
r.idx.Insert(idx)
}
return nil
})
err := wg.Wait()
if err != nil {
return err
}
return <-errCh
// remove index files from the cache which have been removed in the repo
err = r.PrepareCache(validIndex)
if err != nil {
return err
}
return nil
}
// PrepareCache initializes the local cache. indexIDs is the list of IDs of
@ -495,14 +550,15 @@ func (r *Repository) PrepareCache(indexIDs restic.IDSet) error {
// LoadIndex loads the index id from backend and returns it.
func LoadIndex(ctx context.Context, repo restic.Repository, id restic.ID) (*Index, error) {
idx, err := LoadIndexWithDecoder(ctx, repo, id, DecodeIndex)
idx, _, err := LoadIndexWithDecoder(ctx, repo, nil, id, DecodeIndex)
if err == nil {
return idx, nil
}
if errors.Cause(err) == ErrOldIndexFormat {
fmt.Fprintf(os.Stderr, "index %v has old format\n", id.Str())
return LoadIndexWithDecoder(ctx, repo, id, DecodeOldIndex)
idx, _, err := LoadIndexWithDecoder(ctx, repo, nil, id, DecodeOldIndex)
return idx, err
}
return nil, err

2
internal/repository/repository_test.go
View file

@ -244,7 +244,7 @@ func BenchmarkLoadAndDecrypt(b *testing.B) {
b.SetBytes(int64(length))
for i := 0; i < b.N; i++ {
data, err := repo.LoadAndDecrypt(context.TODO(), restic.DataFile, storageID)
data, err := repo.LoadAndDecrypt(context.TODO(), nil, restic.DataFile, storageID)
rtest.OK(b, err)
if len(data) != length {
b.Errorf("wanted %d bytes, got %d", length, len(data))

35
internal/repository/worker_group.go Normal file
View file

@ -0,0 +1,35 @@
package repository
import (
"context"
"golang.org/x/sync/errgroup"
)
// RunWorkers runs count instances of workerFunc using an errgroup.Group.
// After all workers have terminated, finalFunc is run. If an error occurs in
// one of the workers, it is returned. FinalFunc is always run, regardless of
// any other previous errors.
func RunWorkers(ctx context.Context, count int, workerFunc, finalFunc func() error) error {
wg, ctx := errgroup.WithContext(ctx)
// run workers
for i := 0; i < count; i++ {
wg.Go(workerFunc)
}
// wait for termination
err := wg.Wait()
// make sure finalFunc is run
finalErr := finalFunc()
// if the workers returned an error, return it to the caller (disregarding
// any error from finalFunc)
if err != nil {
return err
}
// if not, return the value finalFunc returned
return finalErr
}

31
internal/restic/id.go
View file

@ -5,6 +5,7 @@ import (
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"io"
"github.com/restic/restic/internal/errors"
@ -101,13 +102,33 @@ func (id ID) MarshalJSON() ([]byte, error) {
// UnmarshalJSON parses the JSON-encoded data and stores the result in id.
func (id *ID) UnmarshalJSON(b []byte) error {
var s string
err := json.Unmarshal(b, &s)
if err != nil {
return errors.Wrap(err, "Unmarshal")
// check string length
if len(b) < 2 {
return fmt.Errorf("invalid ID: %q", b)
}
_, err = hex.Decode(id[:], []byte(s))
if len(b)%2 != 0 {
return fmt.Errorf("invalid ID length: %q", b)
}
// check string delimiters
if b[0] != '"' && b[0] != '\'' {
return fmt.Errorf("invalid start of string: %q", b[0])
}
last := len(b) - 1
if b[0] != b[last] {
return fmt.Errorf("starting string delimiter (%q) does not match end (%q)", b[0], b[last])
}
// strip JSON string delimiters
b = b[1:last]
if len(b) != 2*len(id) {
return fmt.Errorf("invalid length for ID")
}
_, err := hex.Decode(id[:], b)
if err != nil {
return errors.Wrap(err, "hex.Decode")
}

39
internal/restic/id_test.go
View file

@ -51,10 +51,47 @@ func TestID(t *testing.T) {
var id3 ID
err = id3.UnmarshalJSON(buf)
if err != nil {
t.Fatal(err)
t.Fatalf("error for %q: %v", buf, err)
}
if !reflect.DeepEqual(id, id3) {
t.Error("ids are not equal")
}
}
}
func TestIDUnmarshal(t *testing.T) {
var tests = []struct {
s string
valid bool
}{
{`"`, false},
{`""`, false},
{`'`, false},
{`"`, false},
{`"c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4"`, false},
{`"c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4f"`, false},
{`"c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4f2"`, true},
}
wantID, err := ParseID("c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4f2")
if err != nil {
t.Fatal(err)
}
for _, test := range tests {
t.Run("", func(t *testing.T) {
id := &ID{}
err := id.UnmarshalJSON([]byte(test.s))
if test.valid && err != nil {
t.Fatal(err)
}
if !test.valid && err == nil {
t.Fatalf("want error for invalid value, got nil")
}
if test.valid && !id.Equal(wantID) {
t.Fatalf("wrong ID returned, want %s, got %s", wantID, id)
}
})
}
}

7
internal/restic/repository.go
View file

@ -39,8 +39,11 @@ type Repository interface {
SaveUnpacked(context.Context, FileType, []byte) (ID, error)
SaveJSONUnpacked(context.Context, FileType, interface{}) (ID, error)
LoadJSONUnpacked(context.Context, FileType, ID, interface{}) error
LoadAndDecrypt(context.Context, FileType, ID) ([]byte, error)
LoadJSONUnpacked(ctx context.Context, t FileType, id ID, dest interface{}) error
// LoadAndDecrypt loads and decrypts the file with the given type and ID,
// using the supplied buffer (which must be empty). If the buffer is nil, a
// new buffer will be allocated and returned.
LoadAndDecrypt(ctx context.Context, buf []byte, t FileType, id ID) (data []byte, err error)
LoadBlob(context.Context, BlobType, ID, []byte) (int, error)
SaveBlob(context.Context, BlobType, []byte, ID) (ID, error)