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Code Issues Releases Wiki Activity

Restructure, adapt for max 16MB chunk size

This commit is contained in:
Alexander Neumann 2014-09-21 16:33:20 +02:00
parent f1f96c4206
commit f0287b2c9a
10 changed files with 42 additions and 271 deletions
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10
cmd/khepri/cmd_fsck.go
View File

@ -1,8 +1,8 @@
package main
import (
"crypto/sha256"
"encoding/json"
"io/ioutil"
"log"
"github.com/fd0/khepri"
@ -16,17 +16,15 @@ func fsck_tree(repo *khepri.Repository, id khepri.ID) (bool, error) {
return false, err
}
hr := khepri.NewHashingReader(rd, sha256.New)
dec := json.NewDecoder(hr)
buf, err := ioutil.ReadAll(rd)
tree := &khepri.Tree{}
err = dec.Decode(tree)
err = json.Unmarshal(buf, tree)
if err != nil {
return false, err
}
if !id.Equal(hr.Hash()) {
if !id.Equal(khepri.IDFromData(buf)) {
return false, nil
}

84
hashing.go
View File

@ -1,84 +0,0 @@
package khepri
import (
"hash"
"io"
)
// HashingReader is the interfaces that wraps a normal reader. When Hash() is called,
// it returns the hash for all data that has been read so far.
type HashingReader interface {
io.Reader
Hash() []byte
}
// HashingWriter is the interfaces that wraps a normal writer. When Hash() is called,
// it returns the hash for all data that has been written so far.
type HashingWriter interface {
io.Writer
Hash() []byte
}
type reader struct {
reader io.Reader
hash hash.Hash
}
// NewHashingReader wraps an io.Reader and in addition feeds all data read through the
// given hash.
func NewHashingReader(r io.Reader, h func() hash.Hash) *reader {
return &reader{
reader: r,
hash: h(),
}
}
func (h *reader) Read(p []byte) (int, error) {
// call original reader
n, err := h.reader.Read(p)
// hash bytes
if n > 0 {
// hash
h.hash.Write(p[0:n])
}
// return result
return n, err
}
func (h *reader) Hash() []byte {
return h.hash.Sum([]byte{})
}
type writer struct {
writer io.Writer
hash hash.Hash
}
// NewHashingWriter wraps an io.Reader and in addition feeds all data written through
// the given hash.
func NewHashingWriter(w io.Writer, h func() hash.Hash) *writer {
return &writer{
writer: w,
hash: h(),
}
}
func (h *writer) Write(p []byte) (int, error) {
// call original writer
n, err := h.writer.Write(p)
// hash bytes
if n > 0 {
// hash
h.hash.Write(p[0:n])
}
// return result
return n, err
}
func (h *writer) Hash() []byte {
return h.hash.Sum([]byte{})
}

33
hashing_example_test.go
View File

@ -1,33 +0,0 @@
package khepri_test
import (
"bytes"
"crypto/md5"
"crypto/sha1"
"fmt"
"strings"
"github.com/fd0/khepri"
)
func ExampleReader() {
str := "foobar"
reader := khepri.NewHashingReader(strings.NewReader(str), md5.New)
buf := make([]byte, len(str))
reader.Read(buf)
fmt.Printf("hash for %q is %02x", str, reader.Hash())
// Output: hash for "foobar" is 3858f62230ac3c915f300c664312c63f
}
func ExampleWriter() {
str := "foobar"
var buf bytes.Buffer
writer := khepri.NewHashingWriter(&buf, sha1.New)
writer.Write([]byte(str))
fmt.Printf("hash for %q is %02x", str, writer.Hash())
// Output: hash for "foobar" is 8843d7f92416211de9ebb963ff4ce28125932878
}

47
hashing_test.go
View File

@ -1,47 +0,0 @@
package khepri_test
import (
"bytes"
"crypto/md5"
"crypto/sha1"
"encoding/hex"
"hash"
"io/ioutil"
"testing"
"github.com/fd0/khepri"
)
var static_tests = []struct {
hash func() hash.Hash
text string
digest string
}{
{md5.New, "foobar\n", "14758f1afd44c09b7992073ccf00b43d"},
// test data from http://www.nsrl.nist.gov/testdata/
{sha1.New, "abc", "a9993e364706816aba3e25717850c26c9cd0d89d"},
{sha1.New, "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", "84983e441c3bd26ebaae4aa1f95129e5e54670f1"},
}
func TestReader(t *testing.T) {
for _, test := range static_tests {
r := khepri.NewHashingReader(bytes.NewBuffer([]byte(test.text)), test.hash)
buf, err := ioutil.ReadAll(r)
ok(t, err)
equals(t, test.text, string(buf))
equals(t, hex.EncodeToString(r.Hash()), test.digest)
}
}
func TestWriter(t *testing.T) {
for _, test := range static_tests {
var buf bytes.Buffer
w := khepri.NewHashingWriter(&buf, test.hash)
_, err := w.Write([]byte(test.text))
ok(t, err)
equals(t, hex.EncodeToString(w.Hash()), test.digest)
}
}

8
id.go
View File

@ -2,6 +2,7 @@ package khepri
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"encoding/json"
)
@ -58,3 +59,10 @@ func (id *ID) UnmarshalJSON(b []byte) error {
return nil
}
func IDFromData(d []byte) ID {
hash := sha256.Sum256(d)
id := make([]byte, 32)
copy(id, hash[:])
return id
}

71
object.go
View File

@ -1,66 +1,27 @@
package khepri
import (
"io"
"os"
)
func (repo *Repository) Create(t Type, data []byte) (ID, error) {
// TODO: make sure that tempfile is removed upon error
type createObject struct {
repo *Repository
tpe Type
hw HashingWriter
file *os.File
ch chan ID
}
func (repo *Repository) Create(t Type) (io.WriteCloser, <-chan ID, error) {
obj := &createObject{
repo: repo,
tpe: t,
ch: make(chan ID, 1),
}
// save contents to tempfile in repository, hash while writing
// create tempfile in repository
var err error
obj.file, err = obj.repo.tempFile()
file, err := repo.tempFile()
if err != nil {
return nil, nil, err
return nil, err
}
// create hashing writer
obj.hw = NewHashingWriter(obj.file, obj.repo.hash)
return obj, obj.ch, nil
}
func (obj *createObject) Write(data []byte) (int, error) {
if obj.hw == nil {
panic("createObject: already closed!")
}
return obj.hw.Write(data)
}
func (obj *createObject) Close() error {
if obj.hw == nil {
panic("createObject: already closed!")
}
obj.file.Close()
id := ID(obj.hw.Hash())
obj.ch <- id
// move file to final name using hash of contents
err := obj.repo.renameFile(obj.file, obj.tpe, id)
// write data to tempfile
_, err = file.Write(data)
if err != nil {
return err
return nil, err
}
obj.hw = nil
obj.file = nil
return nil
// close tempfile, return id
id := IDFromData(data)
err = repo.renameFile(file, t, id)
if err != nil {
return nil, err
}
return id, nil
}

12
object_test.go
View File

@ -16,18 +16,12 @@ func TestObjects(t *testing.T) {
}()
for _, test := range TestStrings {
obj, ch, err := repo.Create(khepri.TYPE_BLOB)
id, err := repo.Create(khepri.TYPE_BLOB, []byte(test.data))
ok(t, err)
_, err = obj.Write([]byte(test.data))
id2, err := khepri.ParseID(test.id)
ok(t, err)
err = obj.Close()
ok(t, err)
id, err := khepri.ParseID(test.id)
ok(t, err)
equals(t, id, <-ch)
equals(t, id2, id)
}
}

9
repository_test.go
View File

@ -75,16 +75,9 @@ func TestRepository(t *testing.T) {
// add files
for _, test := range TestStrings {
// store string in repository
obj, id_ch, err := repo.Create(test.t)
id, err := repo.Create(test.t, []byte(test.data))
ok(t, err)
_, err = obj.Write([]byte(test.data))
ok(t, err)
err = obj.Close()
ok(t, err)
id := <-id_ch
equals(t, test.id, id.String())
// try to get it out again

14
snapshot.go
View File

@ -47,25 +47,17 @@ func (sn *Snapshot) Save(repo *Repository) (ID, error) {
panic("Snapshot.Save() called with nil tree id")
}
obj, id_ch, err := repo.Create(TYPE_REF)
data, err := json.Marshal(sn)
if err != nil {
return nil, err
}
enc := json.NewEncoder(obj)
err = enc.Encode(sn)
id, err := repo.Create(TYPE_REF, data)
if err != nil {
return nil, err
}
err = obj.Close()
if err != nil {
return nil, err
}
sn.id = <-id_ch
return sn.id, nil
return id, nil
}
func LoadSnapshot(repo *Repository, id ID) (*Snapshot, error) {

25
tree.go
View File

@ -5,6 +5,7 @@ import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"os/user"
"path/filepath"
@ -48,18 +49,17 @@ func NewTree() *Tree {
}
func store_chunk(repo *Repository, rd io.Reader) (ID, error) {
wr, idch, err := repo.Create(TYPE_BLOB)
data, err := ioutil.ReadAll(rd)
if err != nil {
return nil, err
}
io.Copy(wr, rd)
err = wr.Close()
id, err := repo.Create(TYPE_BLOB, data)
if err != nil {
return nil, err
}
return <-idch, nil
return id, nil
}
func NewTreeFromPath(repo *Repository, dir string) (*Tree, error) {
@ -152,27 +152,17 @@ func (tree *Tree) Save(repo *Repository) (ID, error) {
}
}
buf, err := json.Marshal(tree)
data, err := json.Marshal(tree)
if err != nil {
return nil, err
}
wr, idch, err := repo.Create(TYPE_BLOB)
id, err := repo.Create(TYPE_BLOB, data)
if err != nil {
return nil, err
}
_, err = wr.Write(buf)
if err != nil {
return nil, err
}
err = wr.Close()
if err != nil {
return nil, err
}
return <-idch, nil
return id, nil
}
func NewTreeFromRepo(repo *Repository, id ID) (*Tree, error) {
@ -208,7 +198,6 @@ func NewTreeFromRepo(repo *Repository, id ID) (*Tree, error) {
func (tree *Tree) CreateAt(path string) error {
for _, node := range tree.Nodes {
nodepath := filepath.Join(path, node.Name)
// fmt.Printf("%s:%s\n", node.Type, nodepath)
if node.Type == "dir" {
err := os.Mkdir(nodepath, 0700)