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package transactional
import (
"io"
"gopkg.in/src-d/go-git.v4/plumbing/storer"
"gopkg.in/src-d/go-git.v4/storage"
)
// Storage is a transactional implementation of git.Storer, it demux the write
// and read operation of two separate storers, allowing to merge content calling
// Storage.Commit.
//
// The API and functionality of this package are considered EXPERIMENTAL and is
// not considered stable nor production ready.
type Storage interface {
storage.Storer
Commit() error
}
// basic implements the Storage interface.
type basic struct {
s, temporal storage.Storer
*ObjectStorage
*ReferenceStorage
*IndexStorage
*ShallowStorage
*ConfigStorage
}
// packageWriter implements storer.PackfileWriter interface over
// a Storage with a temporal storer that supports it.
type packageWriter struct {
*basic
pw storer.PackfileWriter
}
// NewStorage returns a new Storage based on two repositories, base is the base
// repository where the read operations are read and temporal is were all
// the write operations are stored.
func NewStorage(base, temporal storage.Storer) Storage {
st := &basic{
s: base,
temporal: temporal,
ObjectStorage: NewObjectStorage(base, temporal),
ReferenceStorage: NewReferenceStorage(base, temporal),
IndexStorage: NewIndexStorage(base, temporal),
ShallowStorage: NewShallowStorage(base, temporal),
ConfigStorage: NewConfigStorage(base, temporal),
}
pw, ok := temporal.(storer.PackfileWriter)
if ok {
return &packageWriter{
basic: st,
pw: pw,
}
}
return st
}
// Module it honors the storage.ModuleStorer interface.
func (s *basic) Module(name string) (storage.Storer, error) {
base, err := s.s.Module(name)
if err != nil {
return nil, err
}
temporal, err := s.temporal.Module(name)
if err != nil {
return nil, err
}
return NewStorage(base, temporal), nil
}
// Commit it copies the content of the temporal storage into the base storage.
func (s *basic) Commit() error {
for _, c := range []interface{ Commit() error }{
s.ObjectStorage,
s.ReferenceStorage,
s.IndexStorage,
s.ShallowStorage,
s.ConfigStorage,
} {
if err := c.Commit(); err != nil {
return err
}
}
return nil
}
// PackfileWriter honors storage.PackfileWriter.
func (s *packageWriter) PackfileWriter() (io.WriteCloser, error) {
return s.pw.PackfileWriter()
}
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