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Simply backend interface

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Rename CreateBlob() method to Create(), remove old Create* methods
This commit is contained in:
Alexander Neumann 2015-02-15 17:26:08 +01:00
parent 35636a9d92
commit 72c951a6ec
6 changed files with 82 additions and 210 deletions
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94
backend/local.go
View file

@ -10,8 +10,6 @@ import (
"path/filepath"
"strconv"
"strings"
"github.com/juju/arrar"
)
const (
@ -183,96 +181,6 @@ func (b *Local) dirname(t Type, id ID) string {
return filepath.Join(b.p, n)
}
// Create stores new content of type t and data and returns the ID. If the blob
// is already present, returns ErrAlreadyPresent and the blob's ID.
func (b *Local) Create(t Type, data []byte) (ID, error) {
// TODO: make sure that tempfile is removed upon error
// check if blob is already present in backend
id := IDFromData(data)
res, err := b.Test(t, id)
if err != nil {
return nil, arrar.Annotate(err, "test for presence")
}
if res {
return id, ErrAlreadyPresent
}
// create tempfile in backend
file, err := b.tempFile()
if err != nil {
return nil, err
}
// write data to tempfile
_, err = file.Write(data)
if err != nil {
return nil, err
}
err = file.Close()
if err != nil {
return nil, err
}
// return id
err = b.renameFile(file, t, id)
if err != nil {
return nil, err
}
return id, nil
}
// CreateFrom reads content from rd and stores it as type t. Returned is the
// storage ID. If the blob is already present, returns ErrAlreadyPresent and
// the blob's ID.
func (b *Local) CreateFrom(t Type, rd io.Reader) (ID, error) {
// TODO: make sure that tempfile is removed upon error
// check hash while writing
hr := NewHashingReader(rd, newHash())
// create tempfile in backend
file, err := b.tempFile()
if err != nil {
return nil, err
}
// write data to tempfile
_, err = io.Copy(file, hr)
if err != nil {
return nil, err
}
err = file.Close()
if err != nil {
return nil, err
}
// get ID
id := ID(hr.Sum(nil))
// check for duplicate ID
res, err := b.Test(t, id)
if err != nil {
return nil, arrar.Annotate(err, "test for presence")
}
if res {
return id, ErrAlreadyPresent
}
// rename file
err = b.renameFile(file, t, id)
if err != nil {
return nil, err
}
return id, nil
}
type localBlob struct {
f *os.File
h hash.Hash
@ -325,7 +233,7 @@ func (lb *localBlob) ID() (ID, error) {
// Create creates a new blob of type t. Blob implements io.WriteCloser. Once
// Close() has been called, ID() can be used to retrieve the ID. If the blob is
// already present, Close() returns ErrAlreadyPresent.
func (b *Local) CreateBlob(t Type) (Blob, error) {
func (b *Local) Create(t Type) (Blob, error) {
// TODO: make sure that tempfile is removed upon error
// create tempfile in backend