Update src/vector_store.py

src/vector_store.py

@@ -1,125 +1,55 @@
-"""Vector store and knowledge base implementation using Qdrant and Ollama embeddings.
-
-This module defines a `KnowledgeBase` class that manages a Qdrant collection, provides methods to add documents (with chunking) and perform semantic search.
-"""
-
-from __future__ import annotations
-
-import os
 from pathlib import Path
-from typing import List, Dict, Any
-
+from uuid import uuid4
 from langchain_ollama import OllamaEmbeddings
 from langchain_qdrant import QdrantVectorStore
-from langchain_core.documents import Document
-from langchain_text_splitters import RecursiveCharacterTextSplitter
 from qdrant_client import QdrantClient
 from qdrant_client.http.models import Distance, VectorParams
-
-# Default configuration constants
-DEFAULT_COLLECTION_NAME = "knowledge_base"
-DEFAULT_VECTOR_SIZE = 3072  # size of nomic-embed-text embeddings
-DEFAULT_DISTANCE = Distance.COSINE
-DEFAULT_QDRANT_PATH = Path("./qdrant_data")
+from langchain_text_splitters import RecursiveCharacterTextSplitter
+from langchain_core.documents import Document
 
 class KnowledgeBase:
-    """A thin wrapper around QdrantVectorStore.
-
-    The class ensures that the collection is created only once and provides
-    convenient methods for adding documents and performing semantic search.
-    """
-
-    def __init__(
-        self,
-        collection_name: str = DEFAULT_COLLECTION_NAME,
-        host: str | None = None,
-        port: int | None = None,
-        path: str | None = None,
-        api_key: str | None = None,
-    ) -> None:
-        """Create or connect to a Qdrant collection.
-
-        Parameters
-        ----------
-        collection_name: str
-            Name of the Qdrant collection.
-        host, port: str/int
-            Optional host and port for a remote Qdrant instance.
-        path: str
-            Path for an on‑disk Qdrant instance (used in local mode).
-        api_key: str
-            API key for Qdrant Cloud.
-        """
-
-        # Determine client connection.
-        if host and port:
-            self.client = QdrantClient(url=f"{host}:{port}")
-        elif path:
-            self.client = QdrantClient(path=path)
-        else:
-            # Default to a persistent on‑disk client.
-            self.client = QdrantClient(path=str(DEFAULT_QDRANT_PATH))
-
-        self.collection_name = collection_name
-
-        # Create collection if it does not exist.
-        if collection_name not in self.client.get_collections().collections:
-            self.client.create_collection(
-                collection_name=collection_name,
-                vectors_config=VectorParams(size=DEFAULT_VECTOR_SIZE, distance=DEFAULT_DISTANCE),
-            )
-
-        # Embedding model from Ollama.
-        self.embeddings = OllamaEmbeddings(model="nomic-embed-text")
-
-        # Vector store wrapper.
-        self.store = QdrantVectorStore(
+    """A simple wrapper around Qdrant for storing and searching documents."""
+    def __init__(self, collection_name: str = "rag_kb", persist_path: str = "qdrant_data"):
+        # Initialize Qdrant client (in‑memory or on‑disk)
+        self.client = QdrantClient(path=persist_path)
+        # Create collection with cosine distance and 3072‑dim vectors (nomic‑embed‑text output)
+        self.client.create_collection(
+            collection_name=collection_name,
+            vectors_config=VectorParams(size=3072, distance=Distance.COSINE),
+        )
+        # Create vector store wrapper
+        self.vector_store = QdrantVectorStore(
             client=self.client,
             collection_name=collection_name,
-            embedding=self.embeddings,
+            embedding=OllamaEmbeddings(model="nomic-embed-text"),
         )
+        # Text splitter for chunking documents
+        self.splitter = RecursiveCharacterTextSplitter(chunk_size=1000, chunk_overlap=200)
 
-        # Text splitter for chunking.
-        self.splitter = RecursiveCharacterTextSplitter(
-            chunk_size=500, chunk_overlap=50, length_function=len
-        )
-
-    # ---------------------------------------------------------------------
-    # Public API
-    # ---------------------------------------------------------------------
-
-    def add_document(self, title: str, content: str) -> None:
+    def add_document(self, title: str, content: str):
         """Add a document to the knowledge base.
 
-        The content is split into chunks, embedded, and stored.
+        The content is split into chunks, each chunk is embedded and stored.
         """
-        # Split into Document objects with metadata.
-        docs = self.splitter.create_documents([content])
-        for i, doc in enumerate(docs):
-            # Attach metadata: title and chunk index.
-            doc.metadata.update({"title": title, "chunk_index": i})
-        # Add to store.
-        self.store.add_documents(docs)
+        # Create Document objects with metadata
+        docs = self.splitter.create_documents([content], metadata={"title": title})
+        # Add to vector store
+        self.vector_store.add_documents(docs)
 
-    def search(self, query: str, limit: int = 5) -> List[Dict[str, Any]]:
-        """Perform a semantic search and return results.
+    def search(self, query: str, limit: int = 10):
+        """Search the knowledge base for the most relevant documents.
 
-        Returns a list of dictionaries containing the chunk content and metadata.
+        Returns a list of dictionaries containing page_content, metadata and score.
         """
-        results = self.store.similarity_search(query, k=limit)
-        output = []
-        for doc in results:
-            output.append(
-                {
-                    "content": doc.page_content,
-                    "title": doc.metadata.get("title"),
-                    "chunk_index": doc.metadata.get("chunk_index"),
-                }
-            )
-        return output
+        results = self.vector_store.similarity_search_with_score(query, k=limit)
+        return [
+            {
+                "page_content": doc.page_content,
+                "metadata": doc.metadata,
+                "score": score,
+            }
+            for doc, score in results
+        ]
 
-    def get_all_documents(self) -> List[Document]:
-        """Return all documents stored in the collection."""
-        return self.store.get_all_documents()
-
-# End of src/vector_store.py
+# Global singleton instance used by tools and the agent
+kb = KnowledgeBase()