Merge branch 'concurrent-backup'

This commit is contained in:
Alexander Neumann 2014-11-22 22:19:58 +01:00
commit d6a202a853
20 changed files with 678 additions and 219 deletions

View File

@ -1,7 +1,6 @@
.PHONY: clean all test
test:
go test -race ./...
for dir in cmd/* ; do \
(cd "$$dir"; go build -race) \
done

View File

@ -1,32 +1,75 @@
package khepri
import (
"io"
"io/ioutil"
"os"
"path/filepath"
"sync"
"github.com/fd0/khepri/backend"
"github.com/fd0/khepri/chunker"
)
const (
maxConcurrentFiles = 32
maxConcurrentBlobs = 32
)
type Archiver struct {
be backend.Server
key *Key
ch *ContentHandler
smap *StorageMap // blobs used for the current snapshot
be backend.Server
key *Key
ch *ContentHandler
bl *BlobList // blobs used for the current snapshot
fileToken chan struct{}
blobToken chan struct{}
Stats Stats
Error func(dir string, fi os.FileInfo, err error) error
Filter func(item string, fi os.FileInfo) bool
ScannerUpdate func(stats Stats)
SaveUpdate func(stats Stats)
sum sync.Mutex // for SaveUpdate
}
type Stats struct {
Files int
Directories int
Other int
Bytes uint64
}
func NewArchiver(be backend.Server, key *Key) (*Archiver, error) {
var err error
arch := &Archiver{be: be, key: key}
arch := &Archiver{
be: be,
key: key,
fileToken: make(chan struct{}, maxConcurrentFiles),
blobToken: make(chan struct{}, maxConcurrentBlobs),
}
// fill file and blob token
for i := 0; i < maxConcurrentFiles; i++ {
arch.fileToken <- struct{}{}
}
for i := 0; i < maxConcurrentBlobs; i++ {
arch.blobToken <- struct{}{}
}
// 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 }
// do nothing
arch.ScannerUpdate = func(Stats) {}
arch.smap = NewStorageMap()
arch.bl = NewBlobList()
arch.ch, err = NewContentHandler(be, key)
if err != nil {
return nil, err
@ -41,59 +84,124 @@ func NewArchiver(be backend.Server, key *Key) (*Archiver, error) {
return arch, nil
}
func (arch *Archiver) Save(t backend.Type, data []byte) (*Blob, error) {
func (arch *Archiver) saveUpdate(stats Stats) {
if arch.SaveUpdate != nil {
arch.sum.Lock()
defer arch.sum.Unlock()
arch.SaveUpdate(stats)
}
}
func (arch *Archiver) Save(t backend.Type, data []byte) (Blob, error) {
blob, err := arch.ch.Save(t, data)
if err != nil {
return nil, err
return Blob{}, err
}
// store blob in storage map for current snapshot
arch.smap.Insert(blob)
arch.bl.Insert(blob)
return blob, nil
}
func (arch *Archiver) SaveJSON(t backend.Type, item interface{}) (*Blob, error) {
func (arch *Archiver) SaveJSON(t backend.Type, item interface{}) (Blob, error) {
blob, err := arch.ch.SaveJSON(t, item)
if err != nil {
return nil, err
return Blob{}, err
}
// store blob in storage map for current snapshot
arch.smap.Insert(blob)
arch.bl.Insert(blob)
return blob, nil
}
func (arch *Archiver) SaveFile(node *Node) (Blobs, error) {
blobs, err := arch.ch.SaveFile(node.path, uint(node.Size))
// SaveFile stores the content of the file on the backend as a Blob by calling
// Save for each chunk.
func (arch *Archiver) SaveFile(node *Node) error {
file, err := os.Open(node.path)
defer file.Close()
if err != nil {
return nil, arch.Error(node.path, nil, err)
return err
}
var blobs Blobs
// if the file is small enough, store it directly
if node.Size < chunker.MinSize {
buf, err := ioutil.ReadAll(file)
if err != nil {
return err
}
blob, err := arch.ch.Save(backend.Data, buf)
if err != nil {
return err
}
arch.saveUpdate(Stats{Bytes: blob.Size})
blobs = Blobs{blob}
} else {
// else store all chunks
chnker := chunker.New(file)
chans := [](<-chan Blob){}
for {
chunk, err := chnker.Next()
if err == io.EOF {
break
}
if err != nil {
return err
}
// acquire token, start goroutine to save chunk
token := <-arch.blobToken
resCh := make(chan Blob, 1)
go func(ch chan<- Blob) {
blob, err := arch.ch.Save(backend.Data, chunk.Data)
// TODO handle error
if err != nil {
panic(err)
}
arch.saveUpdate(Stats{Bytes: blob.Size})
arch.blobToken <- token
ch <- blob
}(resCh)
chans = append(chans, resCh)
}
blobs = []Blob{}
for _, ch := range chans {
blobs = append(blobs, <-ch)
}
}
node.Content = make([]backend.ID, len(blobs))
for i, blob := range blobs {
node.Content[i] = blob.ID
arch.smap.Insert(blob)
arch.bl.Insert(blob)
}
return blobs, err
return err
}
func (arch *Archiver) ImportDir(dir string) (Tree, error) {
func (arch *Archiver) loadTree(dir string) (*Tree, error) {
// open and list path
fd, err := os.Open(dir)
defer fd.Close()
if err != nil {
return nil, arch.Error(dir, nil, err)
return nil, err
}
entries, err := fd.Readdir(-1)
if err != nil {
return nil, arch.Error(dir, nil, err)
}
if len(entries) == 0 {
return nil, nil
return nil, err
}
tree := Tree{}
@ -107,71 +215,110 @@ func (arch *Archiver) ImportDir(dir string) (Tree, error) {
node, err := NodeFromFileInfo(path, entry)
if err != nil {
return nil, arch.Error(dir, entry, err)
// TODO: error processing
return nil, err
}
tree = append(tree, node)
if entry.IsDir() {
subtree, err := arch.ImportDir(path)
node.Tree, err = arch.loadTree(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)
}
switch node.Type {
case "file":
arch.Stats.Files++
arch.Stats.Bytes += node.Size
case "dir":
arch.Stats.Directories++
default:
arch.Stats.Other++
}
}
return tree, nil
arch.ScannerUpdate(arch.Stats)
return &tree, nil
}
func (arch *Archiver) Import(dir string) (*Snapshot, *Blob, error) {
func (arch *Archiver) LoadTree(path string) (*Tree, error) {
fi, err := os.Lstat(path)
if err != nil {
return nil, err
}
node, err := NodeFromFileInfo(path, fi)
if err != nil {
return nil, err
}
if node.Type != "dir" {
arch.Stats.Files = 1
arch.Stats.Bytes = node.Size
arch.ScannerUpdate(arch.Stats)
return &Tree{node}, nil
}
arch.Stats.Directories = 1
node.Tree, err = arch.loadTree(path)
if err != nil {
return nil, err
}
arch.ScannerUpdate(arch.Stats)
return &Tree{node}, nil
}
func (arch *Archiver) saveTree(t *Tree) (Blob, error) {
var wg sync.WaitGroup
for _, node := range *t {
if node.Tree != nil && node.Subtree == nil {
b, err := arch.saveTree(node.Tree)
if err != nil {
return Blob{}, err
}
node.Subtree = b.ID
arch.saveUpdate(Stats{Directories: 1})
} else if node.Type == "file" && len(node.Content) == 0 {
// start goroutine
wg.Add(1)
go func(n *Node) {
defer wg.Done()
// get token
token := <-arch.fileToken
defer func() {
arch.fileToken <- token
}()
// TODO: handle error
arch.SaveFile(n)
arch.saveUpdate(Stats{Files: 1})
}(node)
} else {
arch.saveUpdate(Stats{Other: 1})
}
}
wg.Wait()
blob, err := arch.SaveJSON(backend.Tree, t)
if err != nil {
return Blob{}, err
}
return blob, nil
}
func (arch *Archiver) Snapshot(dir string, t *Tree) (*Snapshot, backend.ID, 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})
blob, err := arch.saveTree(t)
if err != nil {
return nil, nil, err
}
@ -179,11 +326,11 @@ func (arch *Archiver) Import(dir string) (*Snapshot, *Blob, error) {
sn.Content = blob.ID
// save snapshot
sn.StorageMap = arch.smap
sn.BlobList = arch.bl
blob, err = arch.SaveJSON(backend.Snapshot, sn)
if err != nil {
return nil, nil, err
}
return sn, blob, nil
return sn, blob.Storage, nil
}

53
archiver_test.go Normal file
View File

@ -0,0 +1,53 @@
package khepri_test
import (
"bytes"
"io"
"math/rand"
"testing"
"github.com/fd0/khepri/chunker"
)
func get_random(seed, count int) []byte {
buf := make([]byte, count)
rnd := rand.New(rand.NewSource(23))
for i := 0; i < count; i += 4 {
r := rnd.Uint32()
buf[i] = byte(r)
buf[i+1] = byte(r >> 8)
buf[i+2] = byte(r >> 16)
buf[i+3] = byte(r >> 24)
}
return buf
}
func BenchmarkChunkEncrypt(b *testing.B) {
data := get_random(23, 10<<20) // 10MiB
be := setupBackend(b)
defer teardownBackend(b, be)
key := setupKey(b, be, "geheim")
b.ResetTimer()
b.SetBytes(int64(len(data)))
for i := 0; i < b.N; i++ {
ch := chunker.New(bytes.NewReader(data))
for {
chunk_data, err := ch.Next()
if err == io.EOF {
break
}
ok(b, err)
_, err = key.Encrypt(chunk_data.Data)
ok(b, err)
}
}
}

View File

@ -47,6 +47,11 @@ func (id ID) EqualString(other string) (bool, error) {
return id.Equal(ID(s)), nil
}
// Compare compares this ID to another one, returning -1, 0, or 1.
func (id ID) Compare(other ID) int {
return bytes.Compare(other, id)
}
func (id ID) MarshalJSON() ([]byte, error) {
return json.Marshal(id.String())
}

99
bloblist.go Normal file
View File

@ -0,0 +1,99 @@
package khepri
import (
"bytes"
"encoding/json"
"errors"
"sort"
"sync"
)
type BlobList struct {
list []Blob
m sync.Mutex
}
var ErrBlobNotFound = errors.New("Blob not found")
func NewBlobList() *BlobList {
return &BlobList{
list: []Blob{},
}
}
func (bl *BlobList) find(blob Blob) (int, Blob, error) {
pos := sort.Search(len(bl.list), func(i int) bool {
return blob.ID.Compare(bl.list[i].ID) >= 0
})
if pos < len(bl.list) && blob.ID.Compare(bl.list[pos].ID) == 0 {
return pos, bl.list[pos], nil
}
return pos, Blob{}, ErrBlobNotFound
}
func (bl *BlobList) Find(blob Blob) (Blob, error) {
bl.m.Lock()
defer bl.m.Unlock()
_, blob, err := bl.find(blob)
return blob, err
}
func (bl *BlobList) Merge(other *BlobList) {
bl.m.Lock()
defer bl.m.Unlock()
other.m.Lock()
defer other.m.Unlock()
for _, blob := range other.list {
bl.insert(blob)
}
}
func (bl *BlobList) insert(blob Blob) {
pos, _, err := bl.find(blob)
if err == nil {
// already present
return
}
// insert blob
// https://code.google.com/p/go-wiki/wiki/bliceTricks
bl.list = append(bl.list, Blob{})
copy(bl.list[pos+1:], bl.list[pos:])
bl.list[pos] = blob
}
func (bl *BlobList) Insert(blob Blob) {
bl.m.Lock()
defer bl.m.Unlock()
bl.insert(blob)
}
func (bl BlobList) MarshalJSON() ([]byte, error) {
return json.Marshal(bl.list)
}
func (bl *BlobList) UnmarshalJSON(data []byte) error {
return json.Unmarshal(data, &bl.list)
}
// Compare compares two blobs by comparing the ID and the size. It returns -1,
// 0, or 1.
func (blob Blob) Compare(other Blob) int {
if res := bytes.Compare(other.ID, blob.ID); res != 0 {
return res
}
if blob.Size < other.Size {
return -1
}
if blob.Size > other.Size {
return 1
}
return 0
}

137
bloblist_test.go Normal file
View File

@ -0,0 +1,137 @@
package khepri_test
import (
"crypto/rand"
"encoding/json"
"flag"
"io"
mrand "math/rand"
"sync"
"testing"
"time"
"github.com/fd0/khepri"
)
const backendIDSize = 8
var maxWorkers = flag.Uint("workers", 100, "number of workers to test BlobList concurrent access against")
func randomID() []byte {
buf := make([]byte, backendIDSize)
_, err := io.ReadFull(rand.Reader, buf)
if err != nil {
panic(err)
}
return buf
}
func newBlob() khepri.Blob {
return khepri.Blob{ID: randomID(), Size: uint64(mrand.Uint32())}
}
// Test basic functionality
func TestBlobList(t *testing.T) {
bl := khepri.NewBlobList()
b := newBlob()
bl.Insert(b)
for i := 0; i < 1000; i++ {
bl.Insert(newBlob())
}
b2, err := bl.Find(khepri.Blob{ID: b.ID})
ok(t, err)
assert(t, b2.Compare(b) == 0, "items are not equal: want %v, got %v", b, b2)
bl2 := khepri.NewBlobList()
for i := 0; i < 1000; i++ {
bl.Insert(newBlob())
}
b2, err = bl2.Find(b)
assert(t, err != nil, "found ID in khepri that was never inserted: %v", b2)
bl2.Merge(bl)
b2, err = bl2.Find(b)
if err != nil {
t.Fatal(err)
}
if b.Compare(b2) != 0 {
t.Fatalf("items are not equal: want %v, got %v", b, b2)
}
}
// Test JSON encode/decode
func TestBlobListJSON(t *testing.T) {
bl := khepri.NewBlobList()
b := khepri.Blob{ID: []byte{1, 2, 3, 4}}
bl.Insert(b)
b2, err := bl.Find(b)
ok(t, err)
assert(t, b2.Compare(b) == 0, "items are not equal: want %v, got %v", b, b2)
buf, err := json.Marshal(bl)
ok(t, err)
bl2 := khepri.BlobList{}
json.Unmarshal(buf, &bl2)
b2, err = bl2.Find(b)
ok(t, err)
assert(t, b2.Compare(b) == 0, "items are not equal: want %v, got %v", b, b2)
buf, err = json.Marshal(bl2)
ok(t, err)
}
// random insert/find access by several goroutines
func TestBlobListRandom(t *testing.T) {
var wg sync.WaitGroup
worker := func(bl *khepri.BlobList) {
defer wg.Done()
b := newBlob()
bl.Insert(b)
for i := 0; i < 200; i++ {
bl.Insert(newBlob())
}
d := time.Duration(mrand.Intn(10)*100) * time.Millisecond
time.Sleep(d)
for i := 0; i < 100; i++ {
b2, err := bl.Find(b)
if err != nil {
t.Fatal(err)
}
if b.Compare(b2) != 0 {
t.Fatalf("items are not equal: want %v, got %v", b, b2)
}
}
bl2 := khepri.NewBlobList()
for i := 0; i < 200; i++ {
bl2.Insert(newBlob())
}
bl2.Merge(bl)
}
bl := khepri.NewBlobList()
for i := 0; uint(i) < *maxWorkers; i++ {
wg.Add(1)
go worker(bl)
}
wg.Wait()
}

View File

@ -218,8 +218,6 @@ func (c *chunker) Next() (*Chunk, error) {
c.pos += steps
c.bpos = c.bmax
}
return nil, nil
}
func (c *chunker) append(b byte) {

1
cmd/khepri/.gitignore vendored Normal file
View File

@ -0,0 +1 @@
config.mk

View File

@ -6,12 +6,15 @@ TAGS =
.PHONY: all clean debug
# include config file if it exists
-include $(CURDIR)/config.mk
all: khepri
khepri: *.go
khepri: *.go $(wildcard ../../*.go) $(wildcard ../../*/*.go)
go build $(TAGS) -ldflags "$(LDFLAGS)"
debug: TAGS=-tags debug
debug: TAGS=-tags debug_cmd
debug: khepri
clean:

View File

@ -4,11 +4,42 @@ import (
"errors"
"fmt"
"os"
"strings"
"time"
"github.com/fd0/khepri"
"github.com/fd0/khepri/backend"
"golang.org/x/crypto/ssh/terminal"
)
func format_bytes(c uint64) string {
b := float64(c)
switch {
case c > 1<<40:
return fmt.Sprintf("%.3f TiB", b/(1<<40))
case c > 1<<30:
return fmt.Sprintf("%.3f GiB", b/(1<<30))
case c > 1<<20:
return fmt.Sprintf("%.3f MiB", b/(1<<20))
case c > 1<<10:
return fmt.Sprintf("%.3f KiB", b/(1<<10))
default:
return fmt.Sprintf("%d B", c)
}
}
func print_tree2(indent int, t *khepri.Tree) {
for _, node := range *t {
if node.Tree != nil {
fmt.Printf("%s%s/\n", strings.Repeat(" ", indent), node.Name)
print_tree2(indent+1, node.Tree)
} else {
fmt.Printf("%s%s\n", strings.Repeat(" ", indent), node.Name)
}
}
}
func commandBackup(be backend.Server, key *khepri.Key, args []string) error {
if len(args) != 1 {
return errors.New("usage: backup [dir|file]")
@ -25,12 +56,52 @@ func commandBackup(be backend.Server, key *khepri.Key, args []string) error {
return err
}
_, blob, err := arch.Import(target)
fmt.Printf("scanning %s\n", target)
if terminal.IsTerminal(int(os.Stdout.Fd())) {
arch.ScannerUpdate = func(stats khepri.Stats) {
fmt.Printf("\r%6d directories, %6d files, %14s", stats.Directories, stats.Files, format_bytes(stats.Bytes))
}
}
// TODO: add filter
// arch.Filter = func(dir string, fi os.FileInfo) bool {
// return true
// }
t, err := arch.LoadTree(target)
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
return err
}
fmt.Printf("snapshot %s saved\n", blob.Storage)
fmt.Printf("\r%6d directories, %6d files, %14s\n", arch.Stats.Directories, arch.Stats.Files, format_bytes(arch.Stats.Bytes))
stats := khepri.Stats{}
if terminal.IsTerminal(int(os.Stdout.Fd())) {
arch.SaveUpdate = func(s khepri.Stats) {
stats.Files += s.Files
stats.Directories += s.Directories
stats.Other += s.Other
stats.Bytes += s.Bytes
fmt.Printf("\r%3.2f%% %d/%d directories, %d/%d files, %s/%s",
float64(stats.Bytes)/float64(arch.Stats.Bytes)*100,
stats.Directories, arch.Stats.Directories,
stats.Files, arch.Stats.Files,
format_bytes(stats.Bytes), format_bytes(arch.Stats.Bytes))
}
}
start := time.Now()
sn, id, err := arch.Snapshot(target, t)
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
}
fmt.Printf("\nsnapshot %s saved: %v\n", id, sn)
duration := time.Now().Sub(start)
fmt.Printf("duration: %s, %.2fMiB/s\n", duration, float64(arch.Stats.Bytes)/float64(duration/time.Second)/(1<<20))
return nil
}

View File

@ -1,4 +1,4 @@
// +build debug
// +build debug_cmd
package main
@ -17,8 +17,8 @@ func initDebugLogger() *log.Logger {
// create new log file
filename := fmt.Sprintf("khepri-debug-%d-%s",
os.Getpid(), time.Now().Format("20060201-150405"))
f, err := os.OpenFile(filepath.Join(os.TempDir(), filename),
os.O_WRONLY|os.O_CREATE, 0600)
path := filepath.Join(os.TempDir(), filename)
f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE, 0600)
if err != nil {
fmt.Fprintf(os.Stderr, "unable to create debug log file: %v", err)
os.Exit(2)
@ -26,7 +26,7 @@ func initDebugLogger() *log.Logger {
// open logger
l := log.New(io.MultiWriter(os.Stderr, f), "DEBUG: ", log.LstdFlags)
fmt.Fprintf(os.Stderr, "logging activated, writing log file %s", filename)
fmt.Fprintf(os.Stderr, "debug log for khepri command activated, writing log file %s\n", path)
l.Printf("khepri %s", version)
return l

View File

@ -1,4 +1,4 @@
// +build !debug
// +build !debug_cmd
package main

View File

@ -5,6 +5,7 @@ import (
"log"
"net/url"
"os"
"runtime"
"sort"
"strings"
@ -128,6 +129,9 @@ func init() {
commands["snapshots"] = commandSnapshots
commands["cat"] = commandCat
commands["ls"] = commandLs
// set GOMAXPROCS to number of CPUs
runtime.GOMAXPROCS(runtime.NumCPU())
}
func main() {

View File

@ -3,27 +3,24 @@ package khepri
import (
"encoding/json"
"errors"
"io"
"io/ioutil"
"os"
"fmt"
"github.com/fd0/khepri/backend"
"github.com/fd0/khepri/chunker"
)
type ContentHandler struct {
be backend.Server
key *Key
content *StorageMap
bl *BlobList
}
// NewContentHandler creates a new content handler.
func NewContentHandler(be backend.Server, key *Key) (*ContentHandler, error) {
ch := &ContentHandler{
be: be,
key: key,
content: NewStorageMap(),
be: be,
key: key,
bl: NewBlobList(),
}
return ch, nil
@ -36,7 +33,8 @@ func (ch *ContentHandler) LoadSnapshot(id backend.ID) (*Snapshot, error) {
return nil, err
}
ch.content.Merge(sn.StorageMap)
ch.bl.Merge(sn.BlobList)
return sn, nil
}
@ -49,7 +47,8 @@ func (ch *ContentHandler) LoadAllSnapshots() error {
if err != nil {
return
}
ch.content.Merge(sn.StorageMap)
ch.bl.Merge(sn.BlobList)
})
if err != nil {
return err
@ -60,18 +59,18 @@ func (ch *ContentHandler) LoadAllSnapshots() error {
// Save encrypts data and stores it to the backend as type t. If the data was
// already saved before, the blob is returned.
func (ch *ContentHandler) Save(t backend.Type, data []byte) (*Blob, error) {
func (ch *ContentHandler) Save(t backend.Type, data []byte) (Blob, error) {
// compute plaintext hash
id := backend.Hash(data)
// test if the hash is already in the backend
blob := ch.content.Find(id)
if blob != nil {
blob, err := ch.bl.Find(Blob{ID: id})
if err == nil {
return blob, nil
}
// else create a new blob
blob = &Blob{
blob = Blob{
ID: id,
Size: uint64(len(data)),
}
@ -79,85 +78,36 @@ func (ch *ContentHandler) Save(t backend.Type, data []byte) (*Blob, error) {
// encrypt blob
ciphertext, err := ch.key.Encrypt(data)
if err != nil {
return nil, err
return Blob{}, err
}
// save blob
sid, err := ch.be.Create(t, ciphertext)
if err != nil {
return nil, err
return Blob{}, err
}
blob.Storage = sid
blob.StorageSize = uint64(len(ciphertext))
// insert blob into the storage map
ch.content.Insert(blob)
ch.bl.Insert(blob)
return blob, nil
}
// SaveJSON serialises item as JSON and uses Save() to store it to the backend as type t.
func (ch *ContentHandler) SaveJSON(t backend.Type, item interface{}) (*Blob, error) {
func (ch *ContentHandler) SaveJSON(t backend.Type, item interface{}) (Blob, error) {
// convert to json
data, err := json.Marshal(item)
if err != nil {
return nil, err
return Blob{}, err
}
// compress and save data
return ch.Save(t, backend.Compress(data))
}
// SaveFile stores the content of the file on the backend as a Blob by calling
// Save for each chunk.
func (ch *ContentHandler) SaveFile(filename string, size uint) (Blobs, error) {
file, err := os.Open(filename)
defer file.Close()
if err != nil {
return nil, err
}
// if the file is small enough, store it directly
if size < chunker.MinSize {
buf, err := ioutil.ReadAll(file)
if err != nil {
return nil, err
}
blob, err := ch.Save(backend.Data, buf)
if err != nil {
return nil, err
}
return Blobs{blob}, nil
}
// else store all chunks
blobs := Blobs{}
chunker := chunker.New(file)
for {
chunk, err := chunker.Next()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
blob, err := ch.Save(backend.Data, chunk.Data)
if err != nil {
return nil, err
}
blobs = append(blobs, blob)
}
return blobs, nil
}
// Load tries to load and decrypt content identified by t and id from the backend.
func (ch *ContentHandler) Load(t backend.Type, id backend.ID) ([]byte, error) {
if t == backend.Snapshot {
@ -177,9 +127,9 @@ func (ch *ContentHandler) Load(t backend.Type, id backend.ID) ([]byte, error) {
}
// lookup storage hash
blob := ch.content.Find(id)
if blob == nil {
return nil, errors.New("Storage ID not found")
blob, err := ch.bl.Find(Blob{ID: id})
if err != nil {
return nil, fmt.Errorf("Storage ID %s not found", id)
}
// load data

36
debug.go Normal file
View File

@ -0,0 +1,36 @@
// +build debug
package khepri
import (
"fmt"
"io"
"log"
"os"
"path/filepath"
"time"
)
var debugLogger = initDebugLogger()
func initDebugLogger() *log.Logger {
// create new log file
filename := fmt.Sprintf("khepri-lib-debug-%d-%s",
os.Getpid(), time.Now().Format("20060201-150405"))
path := filepath.Join(os.TempDir(), filename)
f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE, 0600)
if err != nil {
fmt.Fprintf(os.Stderr, "unable to create debug log file: %v", err)
os.Exit(2)
}
// open logger
l := log.New(io.MultiWriter(os.Stderr, f), "DEBUG: ", log.LstdFlags)
fmt.Fprintf(os.Stderr, "debug log for khepri library activated, writing log file %s\n", path)
return l
}
func debug(fmt string, args ...interface{}) {
debugLogger.Printf(fmt, args...)
}

5
debug_release.go Normal file
View File

@ -0,0 +1,5 @@
// +build !debug
package khepri
func debug(fmt string, args ...interface{}) {}

View File

@ -30,12 +30,12 @@ func NewRestorer(be backend.Server, key *Key, snid backend.ID) (*Restorer, error
var err error
r.ch, err = NewContentHandler(be, key)
if err != nil {
return nil, err
return nil, arrar.Annotate(err, "create contenthandler for restorer")
}
r.sn, err = r.ch.LoadSnapshot(snid)
if err != nil {
return nil, err
return nil, arrar.Annotate(err, "load snapshot for restorer")
}
// abort on all errors

View File

@ -11,14 +11,14 @@ import (
)
type Snapshot struct {
Time time.Time `json:"time"`
Content backend.ID `json:"content"`
StorageMap *StorageMap `json:"map"`
Dir string `json:"dir"`
Hostname string `json:"hostname,omitempty"`
Username string `json:"username,omitempty"`
UID string `json:"uid,omitempty"`
GID string `json:"gid,omitempty"`
Time time.Time `json:"time"`
Content backend.ID `json:"content"`
BlobList *BlobList `json:"blobs"`
Dir string `json:"dir"`
Hostname string `json:"hostname,omitempty"`
Username string `json:"username,omitempty"`
UID string `json:"uid,omitempty"`
GID string `json:"gid,omitempty"`
id backend.ID // plaintext ID, used during restore
}

View File

@ -1,51 +0,0 @@
package khepri
import (
"bytes"
"sort"
"github.com/fd0/khepri/backend"
)
type StorageMap Blobs
func NewStorageMap() *StorageMap {
return &StorageMap{}
}
func (m StorageMap) find(id backend.ID) (int, *Blob) {
i := sort.Search(len(m), func(i int) bool {
return bytes.Compare(m[i].ID, id) >= 0
})
if i < len(m) && bytes.Equal(m[i].ID, id) {
return i, m[i]
}
return i, nil
}
func (m StorageMap) Find(id backend.ID) *Blob {
_, blob := m.find(id)
return blob
}
func (m *StorageMap) Insert(blob *Blob) {
pos, b := m.find(blob.ID)
if b != nil {
// already present
return
}
// insert blob
// https://code.google.com/p/go-wiki/wiki/SliceTricks
*m = append(*m, nil)
copy((*m)[pos+1:], (*m)[pos:])
(*m)[pos] = blob
}
func (m *StorageMap) Merge(sm *StorageMap) {
for _, blob := range *sm {
m.Insert(blob)
}
}

View File

@ -34,6 +34,8 @@ type Node struct {
Content []backend.ID `json:"content,omitempty"`
Subtree backend.ID `json:"subtree,omitempty"`
Tree *Tree `json:"-"`
path string
}
@ -44,7 +46,7 @@ type Blob struct {
StorageSize uint64 `json:"ssize,omitempty"` // encrypted Size
}
type Blobs []*Blob
type Blobs []Blob
func (n Node) String() string {
switch n.Type {