Added metadata, IO pipe instead of byte transfer.

metadata/metadata.go

@@ -0,0 +1,66 @@
+package metadata
+
+import (
+	"encoding/json"
+	"fmt"
+	"fs/models"
+
+	"go.etcd.io/bbolt"
+)
+
+const ManifestBucketName = "object_manifests"
+
+type MetadataHandler struct {
+	db *bbolt.DB
+}
+
+func NewMetadataHandler(dbPath string) (*MetadataHandler, error) {
+	db, err := bbolt.Open(dbPath, 0600, nil)
+	if err != nil {
+		return nil, err
+	}
+	return &MetadataHandler{db: db}, nil
+}
+
+func (h *MetadataHandler) PutManifest(manifest *models.ObjectManifest) error {
+	err := h.db.Update(func(tx *bbolt.Tx) error {
+		metadataBucket, err := tx.CreateBucketIfNotExists([]byte(ManifestBucketName))
+		if err != nil {
+			return err
+		}
+		key := fmt.Sprintf("%s/%s", manifest.Bucket, manifest.Key)
+		data, err := json.Marshal(manifest)
+		if err != nil {
+			return err
+		}
+		return metadataBucket.Put([]byte(key), data)
+	})
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (h *MetadataHandler) GetManifest(bucket, key string) (*models.ObjectManifest, error) {
+	var manifest *models.ObjectManifest
+
+	h.db.View(func(tx *bbolt.Tx) error {
+		metadataBucket := tx.Bucket([]byte(ManifestBucketName))
+		if metadataBucket == nil {
+			return fmt.Errorf("bucket %s not found", ManifestBucketName)
+		}
+		key := fmt.Sprintf("%s/%s", bucket, key)
+		data := metadataBucket.Get([]byte(key))
+		if data == nil {
+
+			return fmt.Errorf("manifest not found for bucket %s and key %s", bucket, key)
+		}
+		err := json.Unmarshal(data, &manifest)
+		if err != nil {
+			return err
+		}
+		return nil
+	})
+
+	return manifest, nil
+}