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package packfile
import (
"io"
billy "github.com/go-git/go-billy/v5"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/cache"
"github.com/go-git/go-git/v5/plumbing/format/idxfile"
"github.com/go-git/go-git/v5/utils/ioutil"
)
// FSObject is an object from the packfile on the filesystem.
type FSObject struct {
hash plumbing.Hash
h *ObjectHeader
offset int64
size int64
typ plumbing.ObjectType
index idxfile.Index
fs billy.Filesystem
path string
cache cache.Object
}
// NewFSObject creates a new filesystem object.
func NewFSObject(
hash plumbing.Hash,
finalType plumbing.ObjectType,
offset int64,
contentSize int64,
index idxfile.Index,
fs billy.Filesystem,
path string,
cache cache.Object,
) *FSObject {
return &FSObject{
hash: hash,
offset: offset,
size: contentSize,
typ: finalType,
index: index,
fs: fs,
path: path,
cache: cache,
}
}
// Reader implements the plumbing.EncodedObject interface.
func (o *FSObject) Reader() (io.ReadCloser, error) {
obj, ok := o.cache.Get(o.hash)
if ok && obj != o {
reader, err := obj.Reader()
if err != nil {
return nil, err
}
return reader, nil
}
f, err := o.fs.Open(o.path)
if err != nil {
return nil, err
}
p := NewPackfileWithCache(o.index, nil, f, o.cache)
if o.size > LargeObjectThreshold {
// We have a big object
h, err := p.objectHeaderAtOffset(o.offset)
if err != nil {
return nil, err
}
r, err := p.getReaderDirect(h)
if err != nil {
_ = f.Close()
return nil, err
}
return ioutil.NewReadCloserWithCloser(r, f.Close), nil
}
r, err := p.getObjectContent(o.offset)
if err != nil {
_ = f.Close()
return nil, err
}
if err := f.Close(); err != nil {
return nil, err
}
return r, nil
}
// SetSize implements the plumbing.EncodedObject interface. This method
// is a noop.
func (o *FSObject) SetSize(int64) {}
// SetType implements the plumbing.EncodedObject interface. This method is
// a noop.
func (o *FSObject) SetType(plumbing.ObjectType) {}
// Hash implements the plumbing.EncodedObject interface.
func (o *FSObject) Hash() plumbing.Hash { return o.hash }
// Size implements the plumbing.EncodedObject interface.
func (o *FSObject) Size() int64 { return o.size }
// Type implements the plumbing.EncodedObject interface.
func (o *FSObject) Type() plumbing.ObjectType {
return o.typ
}
// Writer implements the plumbing.EncodedObject interface. This method always
// returns a nil writer.
func (o *FSObject) Writer() (io.WriteCloser, error) {
return nil, nil
}
type objectReader struct {
io.ReadCloser
f billy.File
}
func (r *objectReader) Close() error {
if err := r.ReadCloser.Close(); err != nil {
_ = r.f.Close()
return err
}
return r.f.Close()
}
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