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