Implementing backup methods

2 files changed, 78 insertions, 0 deletions

diff --git a/storage/memory_storage.go b/storage/memory_storage.go
new file mode 100644
index 0000000..0c90981
--- /dev/null
+++ b/storage/memory_storage.go
@@ -0,0 +1,41 @@
+package storage
+
+import (
+	"code.laria.me/petrific/objects"
+)
+
+type MemoryStorage struct {
+	objects map[string][]byte
+	bytype  map[objects.ObjectType][]objects.ObjectId
+}
+
+func NewMemoryStorage() Storage {
+	return MemoryStorage{
+		objects: make(map[string][]byte),
+		bytype:  make(map[objects.ObjectType][]objects.ObjectId),
+	}
+}
+
+func (ms MemoryStorage) Get(id objects.ObjectId) ([]byte, error) {
+	b, ok := ms.objects[id.String()]
+	if !ok {
+		return nil, ObjectNotFound
+	}
+	return b, nil
+}
+
+func (ms MemoryStorage) Has(id objects.ObjectId) (bool, error) {
+	_, ok := ms.objects[id.String()]
+	return ok, nil
+}
+
+func (ms MemoryStorage) Set(id objects.ObjectId, typ objects.ObjectType, raw []byte) error {
+	ms.objects[id.String()] = raw
+	ms.bytype[typ] = append(ms.bytype[typ], id)
+
+	return nil
+}
+
+func (ms MemoryStorage) List(typ objects.ObjectType) ([]objects.ObjectId, error) {
+	return ms.bytype[typ], nil
+}
diff --git a/storage/storage.go b/storage/storage.go
new file mode 100644
index 0000000..424661c
--- /dev/null
+++ b/storage/storage.go
@@ -0,0 +1,37 @@
+package storage
+
+import (
+	"bytes"
+	"code.laria.me/petrific/objects"
+	"errors"
+)
+
+var (
+	ObjectNotFound = errors.New("Object not found")
+)
+
+type Storage interface {
+	Get(id objects.ObjectId) ([]byte, error)
+	Has(id objects.ObjectId) (bool, error)
+	Set(id objects.ObjectId, typ objects.ObjectType, raw []byte) error
+	List(typ objects.ObjectType) ([]objects.ObjectId, error)
+}
+
+func SetObject(s Storage, o objects.RawObject) (id objects.ObjectId, err error) {
+	buf := new(bytes.Buffer)
+
+	id, err = o.SerializeAndId(buf, objects.OIdAlgoDefault)
+	if err != nil {
+		return
+	}
+
+	ok, err := s.Has(id)
+	if err != nil {
+		return
+	}
+
+	if !ok {
+		err = s.Set(id, o.Type, buf.Bytes())
+	}
+	return
+}