object/store/mix: Add

1 files changed, 53 insertions, 0 deletions

diff --git a/object/store/mix/reader.go b/object/store/mix/reader.go
new file mode 100644
index 00000000..f9edc1a4
--- /dev/null
+++ b/object/store/mix/reader.go
@@ -0,0 +1,53 @@
+package mix
+
+import (
+	"errors"
+	"fmt"
+	"io"
+
+	"lindenii.org/go/furgit/object/id"
+	"lindenii.org/go/furgit/object/store"
+	"lindenii.org/go/furgit/object/typ"
+)
+
+// ReadReaderFull reads a full serialized object stream
+// from the most-recently-used backend that has it.
+func (mix *Mix) ReadReaderFull(id id.ObjectID) (io.ReadCloser, error) {
+	for _, backend := range mix.order.Keys() {
+		reader, err := backend.ReadReaderFull(id)
+		if err == nil {
+			mix.order.Touch(backend)
+
+			return reader, nil
+		}
+
+		if errors.Is(err, store.ErrObjectNotFound) {
+			continue
+		}
+
+		return nil, fmt.Errorf("object/store/mix: read reader full: %w", err)
+	}
+
+	return nil, store.ErrObjectNotFound
+}
+
+// ReadReaderContent reads an object's type, declared content length,
+// and content stream from the most-recently-used backend that has it.
+func (mix *Mix) ReadReaderContent(id id.ObjectID) (typ.Type, uint64, io.ReadCloser, error) {
+	for _, backend := range mix.order.Keys() {
+		ty, size, reader, err := backend.ReadReaderContent(id)
+		if err == nil {
+			mix.order.Touch(backend)
+
+			return ty, size, reader, nil
+		}
+
+		if errors.Is(err, store.ErrObjectNotFound) {
+			continue
+		}
+
+		return typ.TypeUnknown, 0, nil, fmt.Errorf("object/store/mix: read reader content: %w", err)
+	}
+
+	return typ.TypeUnknown, 0, nil, store.ErrObjectNotFound
+}