fix(chroma): replace deprecated Client(settings=) with HttpClient for chromadb >=1.0 (#12900)

* fix(chroma): replace deprecated Client(settings=) with HttpClient for chromadb >=1.0

On chromadb 1.0+, `chromadb.Client(settings=Settings(chroma_server_host=...))`
silently creates a local in-memory ephemeral database instead of connecting to
the configured remote server. This caused the Chroma DB component to always
return empty results (`dataframe: []`) when pointing at a remote ChromaDB server.

Replace the deprecated `Client(settings=...)` call with `chromadb.HttpClient()`
which is the correct API for connecting to a remote ChromaDB HTTP server.

Also update component_index.json with the fixed component code and recomputed sha256.

Fixes #12665

Co-Authored-By: Octopus <liyuan851277048@icloud.com>

* Update component_index.json

* Update test_chroma_vector_store_component.py

* [autofix.ci] apply automated fixes

---------

Co-authored-by: octo-patch <octo-patch@github.com>
Co-authored-by: Octopus <liyuan851277048@icloud.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

src/backend/tests/unit/components/vectorstores/test_chroma_vector_store_component.py

@@ -1,5 +1,6 @@
 from pathlib import Path
 from typing import Any
+from unittest.mock import MagicMock, patch
 
 import pytest
 from lfx.components.chroma import ChromaVectorStoreComponent
@@ -8,6 +9,37 @@ from lfx.schema.data import Data
 from tests.base import ComponentTestBaseWithoutClient, VersionComponentMapping
 
 
+def test_remote_chroma_server_uses_http_client() -> None:
+    mock_client = MagicMock()
+    mock_chroma = MagicMock()
+    mock_chroma.get.return_value = {"ids": [], "documents": [], "metadatas": []}
+
+    with (
+        patch("chromadb.HttpClient", return_value=mock_client) as mock_http_client,
+        patch("langchain_chroma.Chroma", return_value=mock_chroma) as mock_chroma_class,
+    ):
+        component = ChromaVectorStoreComponent().set(
+            collection_name="remote_collection",
+            persist_directory=None,
+            embedding=None,
+            chroma_server_host="chroma.example.com",
+            chroma_server_http_port=8100,
+            chroma_server_ssl_enabled=True,
+            ingest_data=[],
+            limit=None,
+        )
+
+        assert component.build_vector_store() is mock_chroma
+
+    mock_http_client.assert_called_once_with(host="chroma.example.com", port=8100, ssl=True)
+    mock_chroma_class.assert_called_once_with(
+        persist_directory=None,
+        client=mock_client,
+        embedding_function=None,
+        collection_name="remote_collection",
+    )
+
+
 @pytest.mark.api_key_required
 class TestChromaVectorStoreComponent(ComponentTestBaseWithoutClient):
     @pytest.fixture

src/lfx/src/lfx/components/chroma/chroma.py

@@ -1,7 +1,6 @@
 from copy import deepcopy
 from typing import TYPE_CHECKING
 
-from chromadb.config import Settings
 from langchain_chroma import Chroma
 from typing_extensions import override
 
@@ -92,23 +91,22 @@ class ChromaVectorStoreComponent(LCVectorStoreComponent):
     def build_vector_store(self) -> Chroma:
         """Builds the Chroma object."""
         try:
-            from chromadb import Client
             from langchain_chroma import Chroma
         except ImportError as e:
             msg = "Could not import Chroma integration package. Please install it with `pip install langchain-chroma`."
             raise ImportError(msg) from e
-        # Chroma settings
-        chroma_settings = None
         client = None
         if self.chroma_server_host:
-            chroma_settings = Settings(
-                chroma_server_cors_allow_origins=self.chroma_server_cors_allow_origins or [],
-                chroma_server_host=self.chroma_server_host,
-                chroma_server_http_port=self.chroma_server_http_port or None,
-                chroma_server_grpc_port=self.chroma_server_grpc_port or None,
-                chroma_server_ssl_enabled=self.chroma_server_ssl_enabled,
+            try:
+                from chromadb import HttpClient
+            except ImportError as e:
+                msg = "Could not import chromadb. Please install it with `pip install chromadb`."
+                raise ImportError(msg) from e
+            client = HttpClient(
+                host=self.chroma_server_host,
+                port=self.chroma_server_http_port or 8000,
+                ssl=bool(self.chroma_server_ssl_enabled),
             )
-            client = Client(settings=chroma_settings)
 
         # Check persist_directory and expand it if it is a relative path
         persist_directory = self.resolve_path(self.persist_directory) if self.persist_directory is not None else None