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

1 files changed, 30 insertions, 0 deletions

diff --git a/object/store/mix/header.go b/object/store/mix/header.go
new file mode 100644
index 00000000..d57375ec
--- /dev/null
+++ b/object/store/mix/header.go
@@ -0,0 +1,30 @@
+package mix
+
+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 one backend that has it.
+func (mix *Mix) ReadHeader(id objectid.ObjectID) (objecttype.Type, int64, error) {
+	for i, backend := 0, mix.firstBackend(); backend != nil; i, backend = i+1, mix.nextBackend(backend) {
+		ty, size, err := backend.ReadHeader(id)
+		if err == nil {
+			mix.touchBackend(backend)
+
+			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
+}