/
replaceComputedFiles.go
198 lines (186 loc) · 5.59 KB
/
replaceComputedFiles.go
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package util
import (
"bytes"
"crypto/sha512"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"time"
"github.com/Cloud-Foundations/Dominator/lib/filesystem"
"github.com/Cloud-Foundations/Dominator/lib/hash"
"github.com/Cloud-Foundations/Dominator/lib/objectserver"
)
type combinedObjectsGetter struct {
filenameToHash map[string]hash.Hash
hashToData map[hash.Hash][]byte
hashToFile map[hash.Hash]string
hashToSize map[hash.Hash]uint64
objectsGetter objectserver.ObjectsGetter
}
type combinedObjectsReader struct {
hashes []hash.Hash
objectsGetter *combinedObjectsGetter
objectsReader objectserver.ObjectsReader
}
func replaceComputedFiles(fs *filesystem.FileSystem,
computedFilesData *ComputedFilesData,
objectsGetter objectserver.ObjectsGetter) (
objectserver.ObjectsGetter, error) {
newObjectsGetter, err := makeCombinedObjectsGetter(computedFilesData,
objectsGetter)
if err != nil {
return nil, err
}
err = replaceInDirectory(fs, &fs.DirectoryInode, "/", newObjectsGetter)
if err != nil {
return nil, err
}
return newObjectsGetter, nil
}
func replaceInDirectory(fs *filesystem.FileSystem,
directory *filesystem.DirectoryInode, dirname string,
objectsGetter *combinedObjectsGetter) error {
for _, entry := range directory.EntryList {
gInode := entry.Inode()
if inode, ok := gInode.(*filesystem.DirectoryInode); ok {
err := replaceInDirectory(fs, inode, path.Join(dirname, entry.Name),
objectsGetter)
if err != nil {
return err
}
} else if inode, ok := gInode.(*filesystem.ComputedRegularInode); ok {
filename := path.Join(dirname, entry.Name)
hashVal, ok := objectsGetter.filenameToHash[filename]
if !ok {
return fmt.Errorf("missing computed file: %s", filename)
}
fInode := &filesystem.RegularInode{
Mode: inode.Mode,
Uid: inode.Uid,
Gid: inode.Gid,
MtimeSeconds: time.Now().Unix(),
Size: objectsGetter.hashToSize[hashVal],
Hash: hashVal,
}
entry.SetInode(fInode)
fs.InodeTable[entry.InodeNumber] = fInode
}
}
return nil
}
func makeCombinedObjectsGetter(computedFilesData *ComputedFilesData,
objectsGetter objectserver.ObjectsGetter) (*combinedObjectsGetter, error) {
newObjectsGetter := &combinedObjectsGetter{
filenameToHash: make(map[string]hash.Hash),
hashToData: make(map[hash.Hash][]byte),
hashToFile: make(map[hash.Hash]string),
hashToSize: make(map[hash.Hash]uint64),
objectsGetter: objectsGetter,
}
for filename, data := range computedFilesData.FileData {
checksummer := sha512.New()
if _, err := checksummer.Write(data); err != nil {
return nil, err
}
var hashVal hash.Hash
copy(hashVal[:], checksummer.Sum(nil))
newObjectsGetter.filenameToHash[filename] = hashVal
newObjectsGetter.hashToData[hashVal] = data
newObjectsGetter.hashToSize[hashVal] = uint64(len(data))
}
if computedFilesData.RootDirectory != "" {
err := newObjectsGetter.scanDirectory(computedFilesData.RootDirectory,
"/")
if err != nil {
return nil, err
}
}
return newObjectsGetter, nil
}
func (objectsGetter *combinedObjectsGetter) GetObjects(hashes []hash.Hash) (
objectserver.ObjectsReader, error) {
unknownHashes := make([]hash.Hash, 0, len(hashes))
for _, hashVal := range hashes {
if _, ok := objectsGetter.hashToData[hashVal]; ok {
continue
}
if _, ok := objectsGetter.hashToFile[hashVal]; ok {
continue
}
unknownHashes = append(unknownHashes, hashVal)
}
objectsReader, err := objectsGetter.objectsGetter.GetObjects(unknownHashes)
if err != nil {
return nil, err
}
return &combinedObjectsReader{hashes, objectsGetter, objectsReader}, nil
}
func (objectsGetter *combinedObjectsGetter) scanDirectory(realDir string,
mapDir string) error {
file, err := os.Open(realDir)
if err != nil {
return err
}
names, err := file.Readdirnames(-1)
file.Close()
if err != nil {
return err
}
for _, name := range names {
realPath := path.Join(realDir, name)
mapPath := path.Join(mapDir, name)
if err := objectsGetter.scanEntry(realPath, mapPath); err != nil {
return err
}
}
return nil
}
func (objectsGetter *combinedObjectsGetter) scanEntry(realFilename string,
mapFilename string) error {
if fi, err := os.Lstat(realFilename); err != nil {
return err
} else if fi.IsDir() {
return objectsGetter.scanDirectory(realFilename, mapFilename)
} else if fi.Mode()&os.ModeType != 0 {
return errors.New(realFilename + ": is not a directory or regular file")
}
if file, err := os.Open(realFilename); err != nil {
return err
} else {
defer file.Close()
checksummer := sha512.New()
nWritten, err := io.Copy(checksummer, file)
if err != nil {
return err
}
var hashVal hash.Hash
copy(hashVal[:], checksummer.Sum(nil))
objectsGetter.filenameToHash[mapFilename] = hashVal
objectsGetter.hashToFile[hashVal] = realFilename
objectsGetter.hashToSize[hashVal] = uint64(nWritten)
}
return nil
}
func (objectsReader *combinedObjectsReader) Close() error {
return objectsReader.objectsReader.Close()
}
func (objectsReader *combinedObjectsReader) NextObject() (
uint64, io.ReadCloser, error) {
hashVal := objectsReader.hashes[0]
objectsReader.hashes = objectsReader.hashes[1:]
if data, ok := objectsReader.objectsGetter.hashToData[hashVal]; ok {
return objectsReader.objectsGetter.hashToSize[hashVal],
ioutil.NopCloser(bytes.NewReader(data)), nil
}
if filename, ok := objectsReader.objectsGetter.hashToFile[hashVal]; ok {
if file, err := os.Open(filename); err != nil {
return 0, nil, err
} else {
return objectsReader.objectsGetter.hashToSize[hashVal], file, nil
}
}
return objectsReader.objectsReader.NextObject()
}