Update vector_store.py

vector_store.py

@@ -1,93 +1,72 @@
-"""Module for interacting with Qdrant vector store using Ollama embeddings.
+"""Vector store implementation using Qdrant and Ollama embeddings.
 
-This module provides a simple wrapper around LangChain's QdrantVectorStore.
-It handles initialization, adding documents (with chunking), and semantic search.
+This module provides a simple wrapper around QdrantVectorStore that handles
+- Initialization of the Qdrant client and collection.
+- Chunking of documents using RecursiveCharacterTextSplitter.
+- Adding documents with embeddings from Ollama.
+- Semantic search.
 """
 
 from pathlib import Path
-from typing import List
+from typing import List, Dict, Any
 
 from langchain_ollama import OllamaEmbeddings
 from langchain_qdrant import QdrantVectorStore
 from langchain_text_splitters import RecursiveCharacterTextSplitter
+from langchain.schema import Document
 
+# Global configuration
+QDRANT_HOST = "localhost"
+QDRANT_PORT = 6333
+COLLECTION_NAME = "knowledge_base"
+EMBEDDING_MODEL = "nomic-embed-text"
 
-class QdrantStore:
-    """A wrapper around QdrantVectorStore.
+# Initialize embeddings and splitter
+embeddings = OllamaEmbeddings(model=EMBEDDING_MODEL)
+text_splitter = RecursiveCharacterTextSplitter(chunk_size=500, chunk_overlap=50)
 
-    Parameters
-    ----------
-    collection_name: str
-        Name of the collection in Qdrant. Defaults to "knowledge_base".
-    url: str
-        URL of the Qdrant instance. Defaults to "http://localhost:6333".
-    """
-
-    def __init__(self, collection_name: str = "knowledge_base", url: str = "http://localhost:6333"):
-        self.collection_name = collection_name
-        self.url = url
-        # Use Ollama embeddings model
-        self.embeddings = OllamaEmbeddings(model="nomic-embed-text")
-        # Initialize an empty vector store (will create collection if not exists)
-        self.vector_store = QdrantVectorStore.from_texts(
-            [], self.embeddings, url=self.url, collection_name=self.collection_name
+# Create or connect to Qdrant collection
+vector_store = QdrantVectorStore(
+    client_kwargs={"host": QDRANT_HOST, "port": QDRANT_PORT},
+    collection_name=COLLECTION_NAME,
+    embeddings=embeddings,
 )
 
-    def _split_text(self, text: str) -> List[str]:
-        """Split a long text into manageable chunks.
+# Ensure collection exists
+if not vector_store.client.has_collection(COLLECTION_NAME):
+    vector_store.client.create_collection(COLLECTION_NAME)
 
-        Uses RecursiveCharacterTextSplitter with a chunk size of 1000 characters and
-        an overlap of 200 characters to preserve context.
+def add_documents(docs: List[Dict[str, str]]) -> None:
+    """Add a list of documents to the vector store.
+
+    Each document dict must contain ``title`` and ``content`` keys.
+    The content is split into chunks before being stored.
     """
-        splitter = RecursiveCharacterTextSplitter(chunk_size=1000, chunk_overlap=200)
-        return splitter.split_text(text)
+    documents: List[Document] = []
+    for doc in docs:
+        title = doc.get("title", "")
+        content = doc.get("content", "")
+        # Split content into chunks
+        chunks = text_splitter.split_text(content)
+        for i, chunk in enumerate(chunks):
+            meta = {"title": title, "chunk_index": i}
+            documents.append(Document(page_content=chunk, metadata=meta))
+    vector_store.add_documents(documents)
 
-    def add_document(self, content: str, title: str) -> None:
-        """Add a document to the vector store.
+def search(query: str, k: int = 5) -> List[Document]:
+    """Semantic search in the vector store.
 
-        Parameters
-        ----------
-        content: str
-            Full text of the document.
-        title: str
-            Title or identifier for the document.
+    Returns a list of Documents ordered by relevance.
     """
-        chunks = self._split_text(content)
-        # Prepare metadata for each chunk
-        metadatas = [{"title": title, "chunk_index": i} for i in range(len(chunks))]
-        self.vector_store.add_texts(chunks, metadatas)
+    return vector_store.similarity_search(query, k=k)
 
-    def search(self, query: str, max_results: int = 5):
-        """Perform a semantic search.
+# Convenience: add a single document
 
-        Parameters
-        ----------
-        query: str
-            The search query.
-        max_results: int
-            Number of top results to return.
+def add_document(title: str, content: str) -> None:
+    add_documents([{"title": title, "content": content}])
 
-        Returns
-        -------
-        List[Document]
-            List of LangChain Document objects.
-        """
-        return self.vector_store.similarity_search(query, k=max_results)
+# Convenience: search and return plain strings
 
-    def load_documents_from_dir(self, directory: str) -> None:
-        """Load all .txt files from a directory into the vector store.
-
-        Parameters
-        ----------
-        directory: str
-            Path to the directory containing text files.
-        """
-        path = Path(directory)
-        for file_path in path.rglob("*.txt"):
-            with file_path.open("r", encoding="utf-8") as f:
-                content = f.read()
-            title = file_path.stem
-            self.add_document(content, title)
-
-# Singleton instance used by tools
-store = QdrantStore()
+def search_text(query: str, k: int = 5) -> List[str]:
+    docs = search(query, k)
+    return [f"{doc.metadata.get('title', 'Untitled')} (chunk {doc.metadata.get('chunk_index', 0)}): {doc.page_content[:200]}..." for doc in docs]