object/store: Rename back from storer; rename Store to ReadingStore v0.1.118

1 files changed, 28 insertions, 0 deletions

diff --git a/object/store/chain/header.go b/object/store/chain/header.go
new file mode 100644
index 00000000..f6c92459
--- /dev/null
+++ b/object/store/chain/header.go
@@ -0,0 +1,28 @@
+package chain
+
+import (
+	"errors"
+	"fmt"
+
+	objectid "codeberg.org/lindenii/furgit/object/id"
+	objectstore "codeberg.org/lindenii/furgit/object/store"
+	objecttype "codeberg.org/lindenii/furgit/object/type"
+)
+
+// ReadHeader reads object header data from the first backend that has it.
+func (chain *Chain) ReadHeader(id objectid.ObjectID) (objecttype.Type, int64, error) {
+	for i, backend := range chain.backends {
+		ty, size, err := backend.ReadHeader(id)
+		if err == nil {
+			return ty, size, nil
+		}
+
+		if errors.Is(err, objectstore.ErrObjectNotFound) {
+			continue
+		}
+
+		return objecttype.TypeInvalid, 0, fmt.Errorf("objectstore: backend %d read header: %w", i, err)
+	}
+
+	return objecttype.TypeInvalid, 0, objectstore.ErrObjectNotFound
+}