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services/raggr/blueprints/rag/logic.py

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+import datetime
+import os
+
+from langchain_chroma import Chroma
+from langchain_core.documents import Document
+from langchain_openai import OpenAIEmbeddings
+from langchain_text_splitters import RecursiveCharacterTextSplitter
+
+from .fetchers import PaperlessNGXService
+
+embeddings = OpenAIEmbeddings(model="text-embedding-3-large")
+
+vector_store = Chroma(
+    collection_name="simba_docs",
+    embedding_function=embeddings,
+    persist_directory=os.getenv("CHROMADB_PATH", ""),
+)
+
+text_splitter = RecursiveCharacterTextSplitter(
+    chunk_size=1000,  # chunk size (characters)
+    chunk_overlap=200,  # chunk overlap (characters)
+    add_start_index=True,  # track index in original document
+)
+
+
+def date_to_epoch(date_str: str) -> float:
+    split_date = date_str.split("-")
+    date = datetime.datetime(
+        int(split_date[0]),
+        int(split_date[1]),
+        int(split_date[2]),
+        0,
+        0,
+        0,
+    )
+
+    return date.timestamp()
+
+
+async def fetch_documents_from_paperless_ngx() -> list[Document]:
+    ppngx = PaperlessNGXService()
+    data = ppngx.get_data()
+    doctypes = ppngx.get_doctypes()
+    documents = []
+    for doc in data:
+        metadata = {
+            "created_date": date_to_epoch(doc["created_date"]),
+            "filename": doc["original_file_name"],
+            "document_type": doctypes.get(doc["document_type"], ""),
+        }
+        documents.append(Document(page_content=doc["content"], metadata=metadata))
+
+    return documents
+
+
+async def index_documents():
+    documents = await fetch_documents_from_paperless_ngx()
+
+    splits = text_splitter.split_documents(documents)
+    await vector_store.aadd_documents(documents=splits)
+
+
+async def query_vector_store(query: str):
+    retrieved_docs = vector_store.similarity_search(query, k=2)
+    serialized = "\n\n".join(
+        (f"Source: {doc.metadata}\nContent: {doc.page_content}")
+        for doc in retrieved_docs
+    )
+    return serialized, retrieved_docs
+
+
+def get_vector_store_stats():
+    """Get statistics about the vector store."""
+    collection = vector_store._collection
+    count = collection.count()
+    return {
+        "total_documents": count,
+        "collection_name": collection.name,
+    }
+
+
+def list_all_documents(limit: int = 10):
+    """List documents in the vector store with their metadata."""
+    collection = vector_store._collection
+    results = collection.get(limit=limit, include=["metadatas", "documents"])
+
+    documents = []
+    for i, doc_id in enumerate(results["ids"]):
+        documents.append(
+            {
+                "id": doc_id,
+                "metadata": results["metadatas"][i]
+                if results.get("metadatas")
+                else None,
+                "content_preview": results["documents"][i][:200]
+                if results.get("documents")
+                else None,
+            }
+        )
+
+    return documents