1 files changed, 38 insertions, 0 deletions
diff --git a/modules/indexer/internal/meilisearch/util.go b/modules/indexer/internal/meilisearch/util.go
new file mode 100644
index 00000000..845bdb6e
--- /dev/null
+++ b/modules/indexer/internal/meilisearch/util.go
@@ -0,0 +1,38 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package meilisearch
+
+import (
+	"fmt"
+
+	"code.gitea.io/gitea/modules/log"
+)
+
+// VersionedIndexName returns the full index name with version
+func (i *Indexer) VersionedIndexName() string {
+	return versionedIndexName(i.indexName, i.version)
+}
+
+func versionedIndexName(indexName string, version int) string {
+	if version == 0 {
+		// Old index name without version
+		return indexName
+	}
+
+	// The format of the index name is <index_name>_v<version>, not <index_name>.v<version> like elasticsearch.
+	// Because meilisearch does not support "." in index name, it should contain only alphanumeric characters, hyphens (-) and underscores (_).
+	// See https://www.meilisearch.com/docs/learn/core_concepts/indexes#index-uid
+
+	return fmt.Sprintf("%s_v%d", indexName, version)
+}
+
+func (i *Indexer) checkOldIndexes() {
+	for v := 0; v < i.version; v++ {
+		indexName := versionedIndexName(i.indexName, v)
+		_, err := i.Client.GetIndex(indexName)
+		if err == nil {
+			log.Warn("Found older meilisearch index named %q, Forgejo will keep the old NOT DELETED. You can delete the old version after the upgrade succeed.", indexName)
+		}
+	}
+}