1 files changed, 55 insertions, 0 deletions
diff --git a/modules/indexer/internal/bleve/metadata.go b/modules/indexer/internal/bleve/metadata.go
new file mode 100644
index 0000000..3c570ab
--- /dev/null
+++ b/modules/indexer/internal/bleve/metadata.go
@@ -0,0 +1,55 @@
+// Copyright 2024 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+// Copied and modified from https://github.com/ethantkoenig/rupture (MIT License)
+
+package bleve
+
+import (
+	"os"
+	"path/filepath"
+
+	"code.gitea.io/gitea/modules/json"
+)
+
+const metaFilename = "rupture_meta.json"
+
+func indexMetadataPath(dir string) string {
+	return filepath.Join(dir, metaFilename)
+}
+
+// IndexMetadata contains metadata about a bleve index.
+type IndexMetadata struct {
+	// The version of the data in the index. This can be useful for tracking
+	// schema changes or data migrations.
+	Version int `json:"version"`
+}
+
+// readIndexMetadata returns the metadata for the index at the specified path.
+// If no such index metadata exists, an empty metadata and a nil error are
+// returned.
+func readIndexMetadata(path string) (*IndexMetadata, error) {
+	meta := &IndexMetadata{}
+	metaPath := indexMetadataPath(path)
+	if _, err := os.Stat(metaPath); os.IsNotExist(err) {
+		return meta, nil
+	} else if err != nil {
+		return nil, err
+	}
+
+	metaBytes, err := os.ReadFile(metaPath)
+	if err != nil {
+		return nil, err
+	}
+	return meta, json.Unmarshal(metaBytes, &meta)
+}
+
+// writeIndexMetadata writes metadata for the index at the specified path.
+func writeIndexMetadata(path string, meta *IndexMetadata) error {
+	metaBytes, err := json.Marshal(meta)
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(indexMetadataPath(path), metaBytes, 0o644)
+}