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lib.go
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lib.go
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package objectserver
import (
"fmt"
"io"
"os"
"syscall"
"github.com/Symantec/Dominator/lib/hash"
)
const (
privateFilePerms = syscall.S_IRUSR | syscall.S_IWUSR
)
func copyObject(filename string, objectsGetter ObjectsGetter,
hashVal hash.Hash) error {
size, reader, err := getObject(objectsGetter, hashVal)
if err != nil {
return err
}
defer reader.Close()
iLength := int64(size)
file, err := os.OpenFile(filename, os.O_CREATE|os.O_EXCL|os.O_WRONLY,
privateFilePerms)
if err != nil {
return err
}
defer file.Close()
nCopied, err := io.CopyN(file, reader, iLength)
if err != nil {
os.Remove(filename)
return err
}
if nCopied != iLength {
os.Remove(filename)
return fmt.Errorf("copied: %d, expected: %d", nCopied, iLength)
}
return nil
}
func getObject(objSrv ObjectsGetter, hashVal hash.Hash) (
uint64, io.ReadCloser, error) {
hashes := make([]hash.Hash, 1)
hashes[0] = hashVal
objectsReader, err := objSrv.GetObjects(hashes)
if err != nil {
return 0, nil, err
}
defer objectsReader.Close()
size, reader, err := objectsReader.NextObject()
if err != nil {
return 0, nil, err
}
return size, reader, nil
}
func linkObject(filename string, objectsGetter ObjectsGetter,
hashVal hash.Hash) (bool, error) {
if objectLinker, ok := objectsGetter.(ObjectLinker); ok {
return objectLinker.LinkObject(filename, hashVal)
}
return false, copyObject(filename, objectsGetter, hashVal)
}