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package object
import (
"io"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/storer"
"gopkg.in/src-d/go-git.v4/utils/ioutil"
)
// Blob is used to store arbitrary data - it is generally a file.
type Blob struct {
// Hash of the blob.
Hash plumbing.Hash
// Size of the (uncompressed) blob.
Size int64
obj plumbing.EncodedObject
}
// GetBlob gets a blob from an object storer and decodes it.
func GetBlob(s storer.EncodedObjectStorer, h plumbing.Hash) (*Blob, error) {
o, err := s.EncodedObject(plumbing.BlobObject, h)
if err != nil {
return nil, err
}
return DecodeBlob(o)
}
// DecodeObject decodes an encoded object into a *Blob.
func DecodeBlob(o plumbing.EncodedObject) (*Blob, error) {
b := &Blob{}
if err := b.Decode(o); err != nil {
return nil, err
}
return b, nil
}
// ID returns the object ID of the blob. The returned value will always match
// the current value of Blob.Hash.
//
// ID is present to fulfill the Object interface.
func (b *Blob) ID() plumbing.Hash {
return b.Hash
}
// Type returns the type of object. It always returns plumbing.BlobObject.
//
// Type is present to fulfill the Object interface.
func (b *Blob) Type() plumbing.ObjectType {
return plumbing.BlobObject
}
// Decode transforms a plumbing.EncodedObject into a Blob struct.
func (b *Blob) Decode(o plumbing.EncodedObject) error {
if o.Type() != plumbing.BlobObject {
return ErrUnsupportedObject
}
b.Hash = o.Hash()
b.Size = o.Size()
b.obj = o
return nil
}
// Encode transforms a Blob into a plumbing.EncodedObject.
func (b *Blob) Encode(o plumbing.EncodedObject) (err error) {
o.SetType(plumbing.BlobObject)
w, err := o.Writer()
if err != nil {
return err
}
defer ioutil.CheckClose(w, &err)
r, err := b.Reader()
if err != nil {
return err
}
defer ioutil.CheckClose(r, &err)
_, err = io.Copy(w, r)
return err
}
// Reader returns a reader allow the access to the content of the blob
func (b *Blob) Reader() (io.ReadCloser, error) {
return b.obj.Reader()
}
// BlobIter provides an iterator for a set of blobs.
type BlobIter struct {
storer.EncodedObjectIter
s storer.EncodedObjectStorer
}
// NewBlobIter takes a storer.EncodedObjectStorer and a
// storer.EncodedObjectIter and returns a *BlobIter that iterates over all
// blobs contained in the storer.EncodedObjectIter.
//
// Any non-blob object returned by the storer.EncodedObjectIter is skipped.
func NewBlobIter(s storer.EncodedObjectStorer, iter storer.EncodedObjectIter) *BlobIter {
return &BlobIter{iter, s}
}
// Next moves the iterator to the next blob and returns a pointer to it. If
// there are no more blobs, it returns io.EOF.
func (iter *BlobIter) Next() (*Blob, error) {
for {
obj, err := iter.EncodedObjectIter.Next()
if err != nil {
return nil, err
}
if obj.Type() != plumbing.BlobObject {
continue
}
return DecodeBlob(obj)
}
}
// ForEach call the cb function for each blob contained on this iter until
// an error happens or the end of the iter is reached. If ErrStop is sent
// the iteration is stop but no error is returned. The iterator is closed.
func (iter *BlobIter) ForEach(cb func(*Blob) error) error {
return iter.EncodedObjectIter.ForEach(func(obj plumbing.EncodedObject) error {
if obj.Type() != plumbing.BlobObject {
return nil
}
b, err := DecodeBlob(obj)
if err != nil {
return err
}
return cb(b)
})
}
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