feat: OpenAIVectorIOMixin for vector_stores common logic (#2427)

Extracts common OpenAI vector-store code into its own mixin so that all
providers can share the same core logic.
This also makes it easy for Llama Stack to support both vector-stores
and Llama Stack APIs in the interim so that both share the same
underlying vector-dbs.

Each provider contains storage specific logic to `create / edit / delete
/ list` vector dbs while the plumbing logic is standardized in the
common code.

Ensured that this works well with both faiss and sqllite-vec. 

### Test Plan 
```
llama stack run starter
pytest -sv --stack-config http://localhost:8321 tests/integration/vector_io/test_openai_vector_stores.py --embedding-model all-MiniLM-L6-v2
```

llama_stack/apis/vector_io/vector_io.py

@@ -165,7 +165,7 @@ class VectorIO(Protocol):
     @webmethod(route="/openai/v1/vector_stores", method="POST")
     async def openai_create_vector_store(
         self,
-        name: str | None = None,
+        name: str,
         file_ids: list[str] | None = None,
         expires_after: dict[str, Any] | None = None,
         chunking_strategy: dict[str, Any] | None = None,

llama_stack/distribution/resolver.py

@@ -394,9 +394,13 @@ def check_protocol_compliance(obj: Any, protocol: Any) -> None:
                     logger.error(f"Method {name} incompatible proto: {proto_params} vs. obj: {obj_params}")
                     missing_methods.append((name, "signature_mismatch"))
                 else:
-                    # Check if the method is actually implemented in the class
-                    method_owner = next((cls for cls in mro if name in cls.__dict__), None)
-                    if method_owner is None or method_owner.__name__ == protocol.__name__:
+                    # Check if the method has a concrete implementation (not just a protocol stub)
+                    # Find all classes in MRO that define this method
+                    method_owners = [cls for cls in mro if name in cls.__dict__]
+
+                    # Allow methods from mixins/parents, only reject if ONLY the protocol defines it
+                    if len(method_owners) == 1 and method_owners[0].__name__ == protocol.__name__:
+                        # Only reject if the method is ONLY defined in the protocol itself (abstract stub)
                         missing_methods.append((name, "not_actually_implemented"))
 
     if missing_methods:

llama_stack/distribution/routers/vector_io.py

@@ -108,7 +108,7 @@ class VectorIORouter(VectorIO):
     # OpenAI Vector Stores API endpoints
     async def openai_create_vector_store(
         self,
-        name: str | None = None,
+        name: str,
         file_ids: list[str] | None = None,
         expires_after: dict[str, Any] | None = None,
         chunking_strategy: dict[str, Any] | None = None,

llama_stack/providers/inline/vector_io/faiss/faiss.py

@@ -9,9 +9,7 @@ import base64
 import io
 import json
 import logging
-import time
-import uuid
-from typing import Any, Literal
+from typing import Any
 
 import faiss
 import numpy as np
@@ -24,14 +22,11 @@ from llama_stack.apis.vector_io import (
     Chunk,
     QueryChunksResponse,
     VectorIO,
-    VectorStoreDeleteResponse,
-    VectorStoreListResponse,
-    VectorStoreObject,
-    VectorStoreSearchResponse,
 )
 from llama_stack.providers.datatypes import VectorDBsProtocolPrivate
 from llama_stack.providers.utils.kvstore import kvstore_impl
 from llama_stack.providers.utils.kvstore.api import KVStore
+from llama_stack.providers.utils.memory.openai_vector_store_mixin import OpenAIVectorStoreMixin
 from llama_stack.providers.utils.memory.vector_store import (
     EmbeddingIndex,
     VectorDBWithIndex,
@@ -47,10 +42,6 @@ FAISS_INDEX_PREFIX = f"faiss_index:{VERSION}::"
 OPENAI_VECTOR_STORES_PREFIX = f"openai_vector_stores:{VERSION}::"
 
 
-# In faiss, since we do
-CHUNK_MULTIPLIER = 5
-
-
 class FaissIndex(EmbeddingIndex):
     def __init__(self, dimension: int, kvstore: KVStore | None = None, bank_id: str | None = None):
         self.index = faiss.IndexFlatL2(dimension)
@@ -140,7 +131,7 @@ class FaissIndex(EmbeddingIndex):
         raise NotImplementedError("Keyword search is not supported in FAISS")
 
 
-class FaissVectorIOAdapter(VectorIO, VectorDBsProtocolPrivate):
+class FaissVectorIOAdapter(OpenAIVectorStoreMixin, VectorIO, VectorDBsProtocolPrivate):
     def __init__(self, config: FaissVectorIOConfig, inference_api: Inference) -> None:
         self.config = config
         self.inference_api = inference_api
@@ -164,14 +155,8 @@ class FaissVectorIOAdapter(VectorIO, VectorDBsProtocolPrivate):
             )
             self.cache[vector_db.identifier] = index
 
-        # Load existing OpenAI vector stores
-        start_key = OPENAI_VECTOR_STORES_PREFIX
-        end_key = f"{OPENAI_VECTOR_STORES_PREFIX}\xff"
-        stored_openai_stores = await self.kvstore.values_in_range(start_key, end_key)
-
-        for store_data in stored_openai_stores:
-            store_info = json.loads(store_data)
-            self.openai_vector_stores[store_info["id"]] = store_info
+        # Load existing OpenAI vector stores using the mixin method
+        self.openai_vector_stores = await self._load_openai_vector_stores()
 
     async def shutdown(self) -> None:
         # Cleanup if needed
@@ -234,285 +219,34 @@ class FaissVectorIOAdapter(VectorIO, VectorDBsProtocolPrivate):
 
         return await index.query_chunks(query, params)
 
-    # OpenAI Vector Stores API endpoints implementation
-    async def openai_create_vector_store(
-        self,
-        name: str | None = None,
-        file_ids: list[str] | None = None,
-        expires_after: dict[str, Any] | None = None,
-        chunking_strategy: dict[str, Any] | None = None,
-        metadata: dict[str, Any] | None = None,
-        embedding_model: str | None = None,
-        embedding_dimension: int | None = 384,
-        provider_id: str | None = None,
-        provider_vector_db_id: str | None = None,
-    ) -> VectorStoreObject:
-        """Creates a vector store."""
+    # OpenAI Vector Store Mixin abstract method implementations
+    async def _save_openai_vector_store(self, store_id: str, store_info: dict[str, Any]) -> None:
+        """Save vector store metadata to kvstore."""
         assert self.kvstore is not None
-        # store and vector_db have the same id
-        store_id = name or str(uuid.uuid4())
-        created_at = int(time.time())
-
-        if provider_id is None:
-            raise ValueError("Provider ID is required")
-
-        if embedding_model is None:
-            raise ValueError("Embedding model is required")
-
-        # Use provided embedding dimension or default to 384
-        if embedding_dimension is None:
-            raise ValueError("Embedding dimension is required")
-
-        provider_vector_db_id = provider_vector_db_id or store_id
-        vector_db = VectorDB(
-            identifier=store_id,
-            embedding_dimension=embedding_dimension,
-            embedding_model=embedding_model,
-            provider_id=provider_id,
-            provider_resource_id=provider_vector_db_id,
-        )
-
-        # Register the vector DB
-        await self.register_vector_db(vector_db)
-
-        # Create OpenAI vector store metadata
-        store_info = {
-            "id": store_id,
-            "object": "vector_store",
-            "created_at": created_at,
-            "name": store_id,
-            "usage_bytes": 0,
-            "file_counts": {},
-            "status": "completed",
-            "expires_after": expires_after,
-            "expires_at": None,
-            "last_active_at": created_at,
-            "file_ids": file_ids or [],
-            "chunking_strategy": chunking_strategy,
-        }
-
-        # Add provider information to metadata if provided
-        metadata = metadata or {}
-        if provider_id:
-            metadata["provider_id"] = provider_id
-        if provider_vector_db_id:
-            metadata["provider_vector_db_id"] = provider_vector_db_id
-        store_info["metadata"] = metadata
-
-        # Store in kvstore
         key = f"{OPENAI_VECTOR_STORES_PREFIX}{store_id}"
         await self.kvstore.set(key=key, value=json.dumps(store_info))
 
-        # Store in memory cache
-        self.openai_vector_stores[store_id] = store_info
-
-        return VectorStoreObject(
-            id=store_id,
-            created_at=created_at,
-            name=store_id,
-            usage_bytes=0,
-            file_counts={},
-            status="completed",
-            expires_after=expires_after,
-            expires_at=None,
-            last_active_at=created_at,
-            metadata=metadata,
-        )
-
-    async def openai_list_vector_stores(
-        self,
-        limit: int = 20,
-        order: str = "desc",
-        after: str | None = None,
-        before: str | None = None,
-    ) -> VectorStoreListResponse:
-        """Returns a list of vector stores."""
-        # Get all vector stores
-        all_stores = list(self.openai_vector_stores.values())
-
-        # Sort by created_at
-        reverse_order = order == "desc"
-        all_stores.sort(key=lambda x: x["created_at"], reverse=reverse_order)
-
-        # Apply cursor-based pagination
-        if after:
-            after_index = next((i for i, store in enumerate(all_stores) if store["id"] == after), -1)
-            if after_index >= 0:
-                all_stores = all_stores[after_index + 1 :]
-
-        if before:
-            before_index = next((i for i, store in enumerate(all_stores) if store["id"] == before), len(all_stores))
-            all_stores = all_stores[:before_index]
-
-        # Apply limit
-        limited_stores = all_stores[:limit]
-        # Convert to VectorStoreObject instances
-        data = [VectorStoreObject(**store) for store in limited_stores]
-
-        # Determine pagination info
-        has_more = len(all_stores) > limit
-        first_id = data[0].id if data else None
-        last_id = data[-1].id if data else None
-
-        return VectorStoreListResponse(
-            data=data,
-            has_more=has_more,
-            first_id=first_id,
-            last_id=last_id,
-        )
-
-    async def openai_retrieve_vector_store(
-        self,
-        vector_store_id: str,
-    ) -> VectorStoreObject:
-        """Retrieves a vector store."""
-        if vector_store_id not in self.openai_vector_stores:
-            raise ValueError(f"Vector store {vector_store_id} not found")
-
-        store_info = self.openai_vector_stores[vector_store_id]
-        return VectorStoreObject(**store_info)
-
-    async def openai_update_vector_store(
-        self,
-        vector_store_id: str,
-        name: str | None = None,
-        expires_after: dict[str, Any] | None = None,
-        metadata: dict[str, Any] | None = None,
-    ) -> VectorStoreObject:
-        """Modifies a vector store."""
+    async def _load_openai_vector_stores(self) -> dict[str, dict[str, Any]]:
+        """Load all vector store metadata from kvstore."""
         assert self.kvstore is not None
-        if vector_store_id not in self.openai_vector_stores:
-            raise ValueError(f"Vector store {vector_store_id} not found")
+        start_key = OPENAI_VECTOR_STORES_PREFIX
+        end_key = f"{OPENAI_VECTOR_STORES_PREFIX}\xff"
+        stored_openai_stores = await self.kvstore.values_in_range(start_key, end_key)
 
-        store_info = self.openai_vector_stores[vector_store_id].copy()
+        stores = {}
+        for store_data in stored_openai_stores:
+            store_info = json.loads(store_data)
+            stores[store_info["id"]] = store_info
+        return stores
 
-        # Update fields if provided
-        if name is not None:
-            store_info["name"] = name
-        if expires_after is not None:
-            store_info["expires_after"] = expires_after
-        if metadata is not None:
-            store_info["metadata"] = metadata
-
-        # Update last_active_at
-        store_info["last_active_at"] = int(time.time())
-
-        # Save to kvstore
-        key = f"{OPENAI_VECTOR_STORES_PREFIX}{vector_store_id}"
+    async def _update_openai_vector_store(self, store_id: str, store_info: dict[str, Any]) -> None:
+        """Update vector store metadata in kvstore."""
+        assert self.kvstore is not None
+        key = f"{OPENAI_VECTOR_STORES_PREFIX}{store_id}"
         await self.kvstore.set(key=key, value=json.dumps(store_info))
 
-        # Update in-memory cache
-        self.openai_vector_stores[vector_store_id] = store_info
-
-        return VectorStoreObject(**store_info)
-
-    async def openai_delete_vector_store(
-        self,
-        vector_store_id: str,
-    ) -> VectorStoreDeleteResponse:
-        """Delete a vector store."""
+    async def _delete_openai_vector_store_from_storage(self, store_id: str) -> None:
+        """Delete vector store metadata from kvstore."""
         assert self.kvstore is not None
-        if vector_store_id not in self.openai_vector_stores:
-            raise ValueError(f"Vector store {vector_store_id} not found")
-
-        # Delete from kvstore
-        key = f"{OPENAI_VECTOR_STORES_PREFIX}{vector_store_id}"
+        key = f"{OPENAI_VECTOR_STORES_PREFIX}{store_id}"
         await self.kvstore.delete(key)
-
-        # Delete from in-memory cache
-        del self.openai_vector_stores[vector_store_id]
-
-        # Also delete the underlying vector DB
-        try:
-            await self.unregister_vector_db(vector_store_id)
-        except Exception as e:
-            logger.warning(f"Failed to delete underlying vector DB {vector_store_id}: {e}")
-
-        return VectorStoreDeleteResponse(
-            id=vector_store_id,
-            deleted=True,
-        )
-
-    async def openai_search_vector_store(
-        self,
-        vector_store_id: str,
-        query: str | list[str],
-        filters: dict[str, Any] | None = None,
-        max_num_results: int = 10,
-        ranking_options: dict[str, Any] | None = None,
-        rewrite_query: bool = False,
-        search_mode: Literal["keyword", "vector", "hybrid"] = "vector",
-    ) -> VectorStoreSearchResponse:
-        """Search for chunks in a vector store."""
-        if vector_store_id not in self.openai_vector_stores:
-            raise ValueError(f"Vector store {vector_store_id} not found")
-
-        if isinstance(query, list):
-            search_query = " ".join(query)
-        else:
-            search_query = query
-
-        try:
-            score_threshold = ranking_options.get("score_threshold", 0.0) if ranking_options else 0.0
-            params = {
-                "max_chunks": max_num_results * CHUNK_MULTIPLIER,
-                "score_threshold": score_threshold,
-                "mode": search_mode,
-            }
-            # TODO: Add support for ranking_options.ranker
-
-            response = await self.query_chunks(
-                vector_db_id=vector_store_id,
-                query=search_query,
-                params=params,
-            )
-
-            # Convert response to OpenAI format
-            data = []
-            for i, (chunk, score) in enumerate(zip(response.chunks, response.scores, strict=False)):
-                # Apply score based filtering
-                if score < score_threshold:
-                    continue
-
-                # Apply filters if provided
-                if filters:
-                    # Simple metadata filtering
-                    if not self._matches_filters(chunk.metadata, filters):
-                        continue
-
-                chunk_data = {
-                    "id": f"chunk_{i}",
-                    "object": "vector_store.search_result",
-                    "score": score,
-                    "content": chunk.content.content if hasattr(chunk.content, "content") else str(chunk.content),
-                    "metadata": chunk.metadata,
-                }
-                data.append(chunk_data)
-                if len(data) >= max_num_results:
-                    break
-
-            return VectorStoreSearchResponse(
-                search_query=search_query,
-                data=data,
-                has_more=False,  # For simplicity, we don't implement pagination here
-                next_page=None,
-            )
-
-        except Exception as e:
-            logger.error(f"Error searching vector store {vector_store_id}: {e}")
-            # Return empty results on error
-            return VectorStoreSearchResponse(
-                search_query=search_query,
-                data=[],
-                has_more=False,
-                next_page=None,
-            )
-
-    def _matches_filters(self, metadata: dict[str, Any], filters: dict[str, Any]) -> bool:
-        """Check if metadata matches the provided filters."""
-        for key, value in filters.items():
-            if key not in metadata:
-                return False
-            if metadata[key] != value:
-                return False
-        return True

llama_stack/providers/inline/vector_io/sqlite_vec/sqlite_vec.py

@@ -10,9 +10,8 @@ import json
 import logging
 import sqlite3
 import struct
-import time
 import uuid
-from typing import Any, Literal
+from typing import Any
 
 import numpy as np
 import sqlite_vec
@@ -24,12 +23,9 @@ from llama_stack.apis.vector_io import (
     Chunk,
     QueryChunksResponse,
     VectorIO,
-    VectorStoreDeleteResponse,
-    VectorStoreListResponse,
-    VectorStoreObject,
-    VectorStoreSearchResponse,
 )
 from llama_stack.providers.datatypes import VectorDBsProtocolPrivate
+from llama_stack.providers.utils.memory.openai_vector_store_mixin import OpenAIVectorStoreMixin
 from llama_stack.providers.utils.memory.vector_store import EmbeddingIndex, VectorDBWithIndex
 
 logger = logging.getLogger(__name__)
@@ -39,11 +35,6 @@ VECTOR_SEARCH = "vector"
 KEYWORD_SEARCH = "keyword"
 SEARCH_MODES = {VECTOR_SEARCH, KEYWORD_SEARCH}
 
-# Constants for OpenAI vector stores (similar to faiss)
-VERSION = "v3"
-OPENAI_VECTOR_STORES_PREFIX = f"openai_vector_stores:{VERSION}::"
-CHUNK_MULTIPLIER = 5
-
 
 def serialize_vector(vector: list[float]) -> bytes:
     """Serialize a list of floats into a compact binary representation."""
@@ -303,7 +294,7 @@ class SQLiteVecIndex(EmbeddingIndex):
         return QueryChunksResponse(chunks=chunks, scores=scores)
 
 
-class SQLiteVecVectorIOAdapter(VectorIO, VectorDBsProtocolPrivate):
+class SQLiteVecVectorIOAdapter(OpenAIVectorStoreMixin, VectorIO, VectorDBsProtocolPrivate):
     """
     A VectorIO implementation using SQLite + sqlite_vec.
     This class handles vector database registration (with metadata stored in a table named `vector_dbs`)
@@ -340,15 +331,12 @@ class SQLiteVecVectorIOAdapter(VectorIO, VectorDBsProtocolPrivate):
                 # Load any existing vector DB registrations.
                 cur.execute("SELECT metadata FROM vector_dbs")
                 vector_db_rows = cur.fetchall()
-                # Load any existing OpenAI vector stores.
-                cur.execute("SELECT metadata FROM openai_vector_stores")
-                openai_store_rows = cur.fetchall()
-                return vector_db_rows, openai_store_rows
+                return vector_db_rows
             finally:
                 cur.close()
                 connection.close()
 
-        vector_db_rows, openai_store_rows = await asyncio.to_thread(_setup_connection)
+        vector_db_rows = await asyncio.to_thread(_setup_connection)
 
         # Load existing vector DBs
         for row in vector_db_rows:
@@ -359,11 +347,8 @@ class SQLiteVecVectorIOAdapter(VectorIO, VectorDBsProtocolPrivate):
             )
             self.cache[vector_db.identifier] = VectorDBWithIndex(vector_db, index, self.inference_api)
 
-        # Load existing OpenAI vector stores
-        for row in openai_store_rows:
-            store_data = row[0]
-            store_info = json.loads(store_data)
-            self.openai_vector_stores[store_info["id"]] = store_info
+        # Load existing OpenAI vector stores using the mixin method
+        self.openai_vector_stores = await self._load_openai_vector_stores()
 
     async def shutdown(self) -> None:
         # nothing to do since we don't maintain a persistent connection
@@ -409,6 +394,87 @@ class SQLiteVecVectorIOAdapter(VectorIO, VectorDBsProtocolPrivate):
 
         await asyncio.to_thread(_delete_vector_db_from_registry)
 
+    # OpenAI Vector Store Mixin abstract method implementations
+    async def _save_openai_vector_store(self, store_id: str, store_info: dict[str, Any]) -> None:
+        """Save vector store metadata to SQLite database."""
+
+        def _store():
+            connection = _create_sqlite_connection(self.config.db_path)
+            cur = connection.cursor()
+            try:
+                cur.execute(
+                    "INSERT OR REPLACE INTO openai_vector_stores (id, metadata) VALUES (?, ?)",
+                    (store_id, json.dumps(store_info)),
+                )
+                connection.commit()
+            except Exception as e:
+                logger.error(f"Error saving openai vector store {store_id}: {e}")
+                raise
+            finally:
+                cur.close()
+                connection.close()
+
+        try:
+            await asyncio.to_thread(_store)
+        except Exception as e:
+            logger.error(f"Error saving openai vector store {store_id}: {e}")
+            raise
+
+    async def _load_openai_vector_stores(self) -> dict[str, dict[str, Any]]:
+        """Load all vector store metadata from SQLite database."""
+
+        def _load():
+            connection = _create_sqlite_connection(self.config.db_path)
+            cur = connection.cursor()
+            try:
+                cur.execute("SELECT metadata FROM openai_vector_stores")
+                rows = cur.fetchall()
+                return rows
+            finally:
+                cur.close()
+                connection.close()
+
+        rows = await asyncio.to_thread(_load)
+        stores = {}
+        for row in rows:
+            store_data = row[0]
+            store_info = json.loads(store_data)
+            stores[store_info["id"]] = store_info
+        return stores
+
+    async def _update_openai_vector_store(self, store_id: str, store_info: dict[str, Any]) -> None:
+        """Update vector store metadata in SQLite database."""
+
+        def _update():
+            connection = _create_sqlite_connection(self.config.db_path)
+            cur = connection.cursor()
+            try:
+                cur.execute(
+                    "UPDATE openai_vector_stores SET metadata = ? WHERE id = ?",
+                    (json.dumps(store_info), store_id),
+                )
+                connection.commit()
+            finally:
+                cur.close()
+                connection.close()
+
+        await asyncio.to_thread(_update)
+
+    async def _delete_openai_vector_store_from_storage(self, store_id: str) -> None:
+        """Delete vector store metadata from SQLite database."""
+
+        def _delete():
+            connection = _create_sqlite_connection(self.config.db_path)
+            cur = connection.cursor()
+            try:
+                cur.execute("DELETE FROM openai_vector_stores WHERE id = ?", (store_id,))
+                connection.commit()
+            finally:
+                cur.close()
+                connection.close()
+
+        await asyncio.to_thread(_delete)
+
     async def insert_chunks(self, vector_db_id: str, chunks: list[Chunk], ttl_seconds: int | None = None) -> None:
         if vector_db_id not in self.cache:
             raise ValueError(f"Vector DB {vector_db_id} not found. Found: {list(self.cache.keys())}")
@@ -423,318 +489,6 @@ class SQLiteVecVectorIOAdapter(VectorIO, VectorDBsProtocolPrivate):
             raise ValueError(f"Vector DB {vector_db_id} not found")
         return await self.cache[vector_db_id].query_chunks(query, params)
 
-    async def openai_create_vector_store(
-        self,
-        name: str | None = None,
-        file_ids: list[str] | None = None,
-        expires_after: dict[str, Any] | None = None,
-        chunking_strategy: dict[str, Any] | None = None,
-        metadata: dict[str, Any] | None = None,
-        embedding_model: str | None = None,
-        embedding_dimension: int | None = 384,
-        provider_id: str | None = None,
-        provider_vector_db_id: str | None = None,
-    ) -> VectorStoreObject:
-        """Creates a vector store."""
-        # store and vector_db have the same id
-        store_id = name or str(uuid.uuid4())
-        created_at = int(time.time())
-
-        if provider_id is None:
-            raise ValueError("Provider ID is required")
-
-        if embedding_model is None:
-            raise ValueError("Embedding model is required")
-
-        # Use provided embedding dimension or default to 384
-        if embedding_dimension is None:
-            raise ValueError("Embedding dimension is required")
-
-        provider_vector_db_id = provider_vector_db_id or store_id
-        vector_db = VectorDB(
-            identifier=store_id,
-            embedding_dimension=embedding_dimension,
-            embedding_model=embedding_model,
-            provider_id=provider_id,
-            provider_resource_id=provider_vector_db_id,
-        )
-
-        # Register the vector DB
-        await self.register_vector_db(vector_db)
-
-        # Create OpenAI vector store metadata
-        store_info = {
-            "id": store_id,
-            "object": "vector_store",
-            "created_at": created_at,
-            "name": store_id,
-            "usage_bytes": 0,
-            "file_counts": {},
-            "status": "completed",
-            "expires_after": expires_after,
-            "expires_at": None,
-            "last_active_at": created_at,
-            "file_ids": file_ids or [],
-            "chunking_strategy": chunking_strategy,
-        }
-
-        # Add provider information to metadata if provided
-        metadata = metadata or {}
-        if provider_id:
-            metadata["provider_id"] = provider_id
-        if provider_vector_db_id:
-            metadata["provider_vector_db_id"] = provider_vector_db_id
-        store_info["metadata"] = metadata
-
-        # Store in SQLite database
-        def _store_openai_vector_store():
-            connection = _create_sqlite_connection(self.config.db_path)
-            cur = connection.cursor()
-            try:
-                cur.execute(
-                    "INSERT OR REPLACE INTO openai_vector_stores (id, metadata) VALUES (?, ?)",
-                    (store_id, json.dumps(store_info)),
-                )
-                connection.commit()
-            finally:
-                cur.close()
-                connection.close()
-
-        await asyncio.to_thread(_store_openai_vector_store)
-
-        # Store in memory cache
-        self.openai_vector_stores[store_id] = store_info
-
-        return VectorStoreObject(
-            id=store_id,
-            created_at=created_at,
-            name=store_id,
-            usage_bytes=0,
-            file_counts={},
-            status="completed",
-            expires_after=expires_after,
-            expires_at=None,
-            last_active_at=created_at,
-            metadata=metadata,
-        )
-
-    async def openai_list_vector_stores(
-        self,
-        limit: int = 20,
-        order: str = "desc",
-        after: str | None = None,
-        before: str | None = None,
-    ) -> VectorStoreListResponse:
-        """Returns a list of vector stores."""
-        # Get all vector stores
-        all_stores = list(self.openai_vector_stores.values())
-
-        # Sort by created_at
-        reverse_order = order == "desc"
-        all_stores.sort(key=lambda x: x["created_at"], reverse=reverse_order)
-
-        # Apply cursor-based pagination
-        if after:
-            after_index = next((i for i, store in enumerate(all_stores) if store["id"] == after), -1)
-            if after_index >= 0:
-                all_stores = all_stores[after_index + 1 :]
-
-        if before:
-            before_index = next((i for i, store in enumerate(all_stores) if store["id"] == before), len(all_stores))
-            all_stores = all_stores[:before_index]
-
-        # Apply limit
-        limited_stores = all_stores[:limit]
-        # Convert to VectorStoreObject instances
-        data = [VectorStoreObject(**store) for store in limited_stores]
-
-        # Determine pagination info
-        has_more = len(all_stores) > limit
-        first_id = data[0].id if data else None
-        last_id = data[-1].id if data else None
-
-        return VectorStoreListResponse(
-            data=data,
-            has_more=has_more,
-            first_id=first_id,
-            last_id=last_id,
-        )
-
-    async def openai_retrieve_vector_store(
-        self,
-        vector_store_id: str,
-    ) -> VectorStoreObject:
-        """Retrieves a vector store."""
-        if vector_store_id not in self.openai_vector_stores:
-            raise ValueError(f"Vector store {vector_store_id} not found")
-
-        store_info = self.openai_vector_stores[vector_store_id]
-        return VectorStoreObject(**store_info)
-
-    async def openai_update_vector_store(
-        self,
-        vector_store_id: str,
-        name: str | None = None,
-        expires_after: dict[str, Any] | None = None,
-        metadata: dict[str, Any] | None = None,
-    ) -> VectorStoreObject:
-        """Modifies a vector store."""
-        if vector_store_id not in self.openai_vector_stores:
-            raise ValueError(f"Vector store {vector_store_id} not found")
-
-        store_info = self.openai_vector_stores[vector_store_id].copy()
-
-        # Update fields if provided
-        if name is not None:
-            store_info["name"] = name
-        if expires_after is not None:
-            store_info["expires_after"] = expires_after
-        if metadata is not None:
-            store_info["metadata"] = metadata
-
-        # Update last_active_at
-        store_info["last_active_at"] = int(time.time())
-
-        # Save to SQLite database
-        def _update_openai_vector_store():
-            connection = _create_sqlite_connection(self.config.db_path)
-            cur = connection.cursor()
-            try:
-                cur.execute(
-                    "UPDATE openai_vector_stores SET metadata = ? WHERE id = ?",
-                    (json.dumps(store_info), vector_store_id),
-                )
-                connection.commit()
-            finally:
-                cur.close()
-                connection.close()
-
-        await asyncio.to_thread(_update_openai_vector_store)
-
-        # Update in-memory cache
-        self.openai_vector_stores[vector_store_id] = store_info
-
-        return VectorStoreObject(**store_info)
-
-    async def openai_delete_vector_store(
-        self,
-        vector_store_id: str,
-    ) -> VectorStoreDeleteResponse:
-        """Delete a vector store."""
-        if vector_store_id not in self.openai_vector_stores:
-            raise ValueError(f"Vector store {vector_store_id} not found")
-
-        # Delete from SQLite database
-        def _delete_openai_vector_store():
-            connection = _create_sqlite_connection(self.config.db_path)
-            cur = connection.cursor()
-            try:
-                cur.execute("DELETE FROM openai_vector_stores WHERE id = ?", (vector_store_id,))
-                connection.commit()
-            finally:
-                cur.close()
-                connection.close()
-
-        await asyncio.to_thread(_delete_openai_vector_store)
-
-        # Delete from in-memory cache
-        del self.openai_vector_stores[vector_store_id]
-
-        # Also delete the underlying vector DB
-        try:
-            await self.unregister_vector_db(vector_store_id)
-        except Exception as e:
-            logger.warning(f"Failed to delete underlying vector DB {vector_store_id}: {e}")
-
-        return VectorStoreDeleteResponse(
-            id=vector_store_id,
-            deleted=True,
-        )
-
-    async def openai_search_vector_store(
-        self,
-        vector_store_id: str,
-        query: str | list[str],
-        filters: dict[str, Any] | None = None,
-        max_num_results: int = 10,
-        ranking_options: dict[str, Any] | None = None,
-        rewrite_query: bool = False,
-        search_mode: Literal["keyword", "vector", "hybrid"] = "vector",
-    ) -> VectorStoreSearchResponse:
-        """Search for chunks in a vector store."""
-        if vector_store_id not in self.openai_vector_stores:
-            raise ValueError(f"Vector store {vector_store_id} not found")
-
-        if isinstance(query, list):
-            search_query = " ".join(query)
-        else:
-            search_query = query
-
-        try:
-            score_threshold = ranking_options.get("score_threshold", 0.0) if ranking_options else 0.0
-            params = {
-                "max_chunks": max_num_results * CHUNK_MULTIPLIER,
-                "score_threshold": score_threshold,
-                "mode": search_mode,
-            }
-            # TODO: Add support for ranking_options.ranker
-
-            response = await self.query_chunks(
-                vector_db_id=vector_store_id,
-                query=search_query,
-                params=params,
-            )
-
-            # Convert response to OpenAI format
-            data = []
-            for i, (chunk, score) in enumerate(zip(response.chunks, response.scores, strict=False)):
-                # Apply score based filtering
-                if score < score_threshold:
-                    continue
-
-                # Apply filters if provided
-                if filters:
-                    # Simple metadata filtering
-                    if not self._matches_filters(chunk.metadata, filters):
-                        continue
-
-                chunk_data = {
-                    "id": f"chunk_{i}",
-                    "object": "vector_store.search_result",
-                    "score": score,
-                    "content": chunk.content.content if hasattr(chunk.content, "content") else str(chunk.content),
-                    "metadata": chunk.metadata,
-                }
-                data.append(chunk_data)
-                if len(data) >= max_num_results:
-                    break
-
-            return VectorStoreSearchResponse(
-                search_query=search_query,
-                data=data,
-                has_more=False,  # For simplicity, we don't implement pagination here
-                next_page=None,
-            )
-
-        except Exception as e:
-            logger.error(f"Error searching vector store {vector_store_id}: {e}")
-            # Return empty results on error
-            return VectorStoreSearchResponse(
-                search_query=search_query,
-                data=[],
-                has_more=False,
-                next_page=None,
-            )
-
-    def _matches_filters(self, metadata: dict[str, Any], filters: dict[str, Any]) -> bool:
-        """Check if metadata matches the provided filters."""
-        for key, value in filters.items():
-            if key not in metadata:
-                return False
-            if metadata[key] != value:
-                return False
-        return True
-
 
 def generate_chunk_id(document_id: str, chunk_text: str) -> str:
     """Generate a unique chunk ID using a hash of document ID and chunk text."""

llama_stack/providers/remote/vector_io/chroma/chroma.py

@@ -189,7 +189,7 @@ class ChromaVectorIOAdapter(VectorIO, VectorDBsProtocolPrivate):
 
     async def openai_create_vector_store(
         self,
-        name: str | None = None,
+        name: str,
         file_ids: list[str] | None = None,
         expires_after: dict[str, Any] | None = None,
         chunking_strategy: dict[str, Any] | None = None,

llama_stack/providers/remote/vector_io/milvus/milvus.py

@@ -187,7 +187,7 @@ class MilvusVectorIOAdapter(VectorIO, VectorDBsProtocolPrivate):
 
     async def openai_create_vector_store(
         self,
-        name: str | None = None,
+        name: str,
         file_ids: list[str] | None = None,
         expires_after: dict[str, Any] | None = None,
         chunking_strategy: dict[str, Any] | None = None,

llama_stack/providers/remote/vector_io/qdrant/qdrant.py

@@ -189,7 +189,7 @@ class QdrantVectorIOAdapter(VectorIO, VectorDBsProtocolPrivate):
 
     async def openai_create_vector_store(
         self,
-        name: str | None = None,
+        name: str,
         file_ids: list[str] | None = None,
         expires_after: dict[str, Any] | None = None,
         chunking_strategy: dict[str, Any] | None = None,

llama_stack/providers/utils/memory/openai_vector_store_mixin.py

@@ -0,0 +1,354 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+import logging
+import time
+import uuid
+from abc import ABC, abstractmethod
+from typing import Any, Literal
+
+from llama_stack.apis.vector_dbs import VectorDB
+from llama_stack.apis.vector_io import (
+    QueryChunksResponse,
+    VectorStoreDeleteResponse,
+    VectorStoreListResponse,
+    VectorStoreObject,
+    VectorStoreSearchResponse,
+)
+
+logger = logging.getLogger(__name__)
+
+# Constants for OpenAI vector stores
+CHUNK_MULTIPLIER = 5
+
+
+class OpenAIVectorStoreMixin(ABC):
+    """
+    Mixin class that provides common OpenAI Vector Store API implementation.
+    Providers need to implement the abstract storage methods and maintain
+    an openai_vector_stores in-memory cache.
+    """
+
+    # These should be provided by the implementing class
+    openai_vector_stores: dict[str, dict[str, Any]]
+
+    @abstractmethod
+    async def _save_openai_vector_store(self, store_id: str, store_info: dict[str, Any]) -> None:
+        """Save vector store metadata to persistent storage."""
+        pass
+
+    @abstractmethod
+    async def _load_openai_vector_stores(self) -> dict[str, dict[str, Any]]:
+        """Load all vector store metadata from persistent storage."""
+        pass
+
+    @abstractmethod
+    async def _update_openai_vector_store(self, store_id: str, store_info: dict[str, Any]) -> None:
+        """Update vector store metadata in persistent storage."""
+        pass
+
+    @abstractmethod
+    async def _delete_openai_vector_store_from_storage(self, store_id: str) -> None:
+        """Delete vector store metadata from persistent storage."""
+        pass
+
+    @abstractmethod
+    async def register_vector_db(self, vector_db: VectorDB) -> None:
+        """Register a vector database (provider-specific implementation)."""
+        pass
+
+    @abstractmethod
+    async def unregister_vector_db(self, vector_db_id: str) -> None:
+        """Unregister a vector database (provider-specific implementation)."""
+        pass
+
+    @abstractmethod
+    async def query_chunks(
+        self, vector_db_id: str, query: Any, params: dict[str, Any] | None = None
+    ) -> QueryChunksResponse:
+        """Query chunks from a vector database (provider-specific implementation)."""
+        pass
+
+    async def openai_create_vector_store(
+        self,
+        name: str,
+        file_ids: list[str] | None = None,
+        expires_after: dict[str, Any] | None = None,
+        chunking_strategy: dict[str, Any] | None = None,
+        metadata: dict[str, Any] | None = None,
+        embedding_model: str | None = None,
+        embedding_dimension: int | None = 384,
+        provider_id: str | None = None,
+        provider_vector_db_id: str | None = None,
+    ) -> VectorStoreObject:
+        """Creates a vector store."""
+        print("IN OPENAI VECTOR STORE MIXIN, openai_create_vector_store")
+        # store and vector_db have the same id
+        store_id = name or str(uuid.uuid4())
+        created_at = int(time.time())
+
+        if provider_id is None:
+            raise ValueError("Provider ID is required")
+
+        if embedding_model is None:
+            raise ValueError("Embedding model is required")
+
+        # Use provided embedding dimension or default to 384
+        if embedding_dimension is None:
+            raise ValueError("Embedding dimension is required")
+
+        provider_vector_db_id = provider_vector_db_id or store_id
+        vector_db = VectorDB(
+            identifier=store_id,
+            embedding_dimension=embedding_dimension,
+            embedding_model=embedding_model,
+            provider_id=provider_id,
+            provider_resource_id=provider_vector_db_id,
+        )
+        from rich.pretty import pprint
+
+        print("VECTOR DB")
+        pprint(vector_db)
+
+        # Register the vector DB
+        await self.register_vector_db(vector_db)
+
+        # Create OpenAI vector store metadata
+        store_info = {
+            "id": store_id,
+            "object": "vector_store",
+            "created_at": created_at,
+            "name": store_id,
+            "usage_bytes": 0,
+            "file_counts": {},
+            "status": "completed",
+            "expires_after": expires_after,
+            "expires_at": None,
+            "last_active_at": created_at,
+            "file_ids": file_ids or [],
+            "chunking_strategy": chunking_strategy,
+        }
+
+        # Add provider information to metadata if provided
+        metadata = metadata or {}
+        if provider_id:
+            metadata["provider_id"] = provider_id
+        if provider_vector_db_id:
+            metadata["provider_vector_db_id"] = provider_vector_db_id
+        store_info["metadata"] = metadata
+
+        # Save to persistent storage (provider-specific)
+        await self._save_openai_vector_store(store_id, store_info)
+
+        # Store in memory cache
+        self.openai_vector_stores[store_id] = store_info
+
+        return VectorStoreObject(
+            id=store_id,
+            created_at=created_at,
+            name=store_id,
+            usage_bytes=0,
+            file_counts={},
+            status="completed",
+            expires_after=expires_after,
+            expires_at=None,
+            last_active_at=created_at,
+            metadata=metadata,
+        )
+
+    async def openai_list_vector_stores(
+        self,
+        limit: int = 20,
+        order: str = "desc",
+        after: str | None = None,
+        before: str | None = None,
+    ) -> VectorStoreListResponse:
+        """Returns a list of vector stores."""
+        # Get all vector stores
+        all_stores = list(self.openai_vector_stores.values())
+
+        # Sort by created_at
+        reverse_order = order == "desc"
+        all_stores.sort(key=lambda x: x["created_at"], reverse=reverse_order)
+
+        # Apply cursor-based pagination
+        if after:
+            after_index = next((i for i, store in enumerate(all_stores) if store["id"] == after), -1)
+            if after_index >= 0:
+                all_stores = all_stores[after_index + 1 :]
+
+        if before:
+            before_index = next((i for i, store in enumerate(all_stores) if store["id"] == before), len(all_stores))
+            all_stores = all_stores[:before_index]
+
+        # Apply limit
+        limited_stores = all_stores[:limit]
+        # Convert to VectorStoreObject instances
+        data = [VectorStoreObject(**store) for store in limited_stores]
+
+        # Determine pagination info
+        has_more = len(all_stores) > limit
+        first_id = data[0].id if data else None
+        last_id = data[-1].id if data else None
+
+        return VectorStoreListResponse(
+            data=data,
+            has_more=has_more,
+            first_id=first_id,
+            last_id=last_id,
+        )
+
+    async def openai_retrieve_vector_store(
+        self,
+        vector_store_id: str,
+    ) -> VectorStoreObject:
+        """Retrieves a vector store."""
+        if vector_store_id not in self.openai_vector_stores:
+            raise ValueError(f"Vector store {vector_store_id} not found")
+
+        store_info = self.openai_vector_stores[vector_store_id]
+        return VectorStoreObject(**store_info)
+
+    async def openai_update_vector_store(
+        self,
+        vector_store_id: str,
+        name: str | None = None,
+        expires_after: dict[str, Any] | None = None,
+        metadata: dict[str, Any] | None = None,
+    ) -> VectorStoreObject:
+        """Modifies a vector store."""
+        if vector_store_id not in self.openai_vector_stores:
+            raise ValueError(f"Vector store {vector_store_id} not found")
+
+        store_info = self.openai_vector_stores[vector_store_id].copy()
+
+        # Update fields if provided
+        if name is not None:
+            store_info["name"] = name
+        if expires_after is not None:
+            store_info["expires_after"] = expires_after
+        if metadata is not None:
+            store_info["metadata"] = metadata
+
+        # Update last_active_at
+        store_info["last_active_at"] = int(time.time())
+
+        # Save to persistent storage (provider-specific)
+        await self._update_openai_vector_store(vector_store_id, store_info)
+
+        # Update in-memory cache
+        self.openai_vector_stores[vector_store_id] = store_info
+
+        return VectorStoreObject(**store_info)
+
+    async def openai_delete_vector_store(
+        self,
+        vector_store_id: str,
+    ) -> VectorStoreDeleteResponse:
+        """Delete a vector store."""
+        if vector_store_id not in self.openai_vector_stores:
+            raise ValueError(f"Vector store {vector_store_id} not found")
+
+        # Delete from persistent storage (provider-specific)
+        await self._delete_openai_vector_store_from_storage(vector_store_id)
+
+        # Delete from in-memory cache
+        del self.openai_vector_stores[vector_store_id]
+
+        # Also delete the underlying vector DB
+        try:
+            await self.unregister_vector_db(vector_store_id)
+        except Exception as e:
+            logger.warning(f"Failed to delete underlying vector DB {vector_store_id}: {e}")
+
+        return VectorStoreDeleteResponse(
+            id=vector_store_id,
+            deleted=True,
+        )
+
+    async def openai_search_vector_store(
+        self,
+        vector_store_id: str,
+        query: str | list[str],
+        filters: dict[str, Any] | None = None,
+        max_num_results: int = 10,
+        ranking_options: dict[str, Any] | None = None,
+        rewrite_query: bool = False,
+        search_mode: Literal["keyword", "vector", "hybrid"] = "vector",
+    ) -> VectorStoreSearchResponse:
+        """Search for chunks in a vector store."""
+        if vector_store_id not in self.openai_vector_stores:
+            raise ValueError(f"Vector store {vector_store_id} not found")
+
+        if isinstance(query, list):
+            search_query = " ".join(query)
+        else:
+            search_query = query
+
+        try:
+            score_threshold = ranking_options.get("score_threshold", 0.0) if ranking_options else 0.0
+            params = {
+                "max_chunks": max_num_results * CHUNK_MULTIPLIER,
+                "score_threshold": score_threshold,
+                "mode": search_mode,
+            }
+            # TODO: Add support for ranking_options.ranker
+
+            response = await self.query_chunks(
+                vector_db_id=vector_store_id,
+                query=search_query,
+                params=params,
+            )
+
+            # Convert response to OpenAI format
+            data = []
+            for i, (chunk, score) in enumerate(zip(response.chunks, response.scores, strict=False)):
+                # Apply score based filtering
+                if score < score_threshold:
+                    continue
+
+                # Apply filters if provided
+                if filters:
+                    # Simple metadata filtering
+                    if not self._matches_filters(chunk.metadata, filters):
+                        continue
+
+                chunk_data = {
+                    "id": f"chunk_{i}",
+                    "object": "vector_store.search_result",
+                    "score": score,
+                    "content": chunk.content.content if hasattr(chunk.content, "content") else str(chunk.content),
+                    "metadata": chunk.metadata,
+                }
+                data.append(chunk_data)
+                if len(data) >= max_num_results:
+                    break
+
+            return VectorStoreSearchResponse(
+                search_query=search_query,
+                data=data,
+                has_more=False,  # For simplicity, we don't implement pagination here
+                next_page=None,
+            )
+
+        except Exception as e:
+            logger.error(f"Error searching vector store {vector_store_id}: {e}")
+            # Return empty results on error
+            return VectorStoreSearchResponse(
+                search_query=search_query,
+                data=[],
+                has_more=False,
+                next_page=None,
+            )
+
+    def _matches_filters(self, metadata: dict[str, Any], filters: dict[str, Any]) -> bool:
+        """Check if metadata matches the provided filters."""
+        for key, value in filters.items():
+            if key not in metadata:
+                return False
+            if metadata[key] != value:
+                return False
+        return True