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8ab43a3 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 | import os
import time
from typing import List, Dict, Optional
from pymongo import MongoClient, errors
from pymongo.collection import Collection
class MongoDBHandler:
"""
Handles interactions with MongoDB for the Gemma-3 RAG system.
Follows PythonMind principles: Simple, Modular, and Robust.
"""
def __init__(self, uri: str = "mongodb://localhost:27017/", db_name: str = "rag_db", collection_name: str = "chunks"):
self.uri = uri
self.db_name = db_name
self.collection_name = collection_name
self.client: Optional[MongoClient] = None
self.db = None
self.collection: Optional[Collection] = None
def connect(self) -> bool:
"""Establishes connection to MongoDB."""
try:
self.client = MongoClient(self.uri, serverSelectionTimeoutMS=5000)
# Trigger a server selection to verify connection
self.client.server_info()
self.db = self.client[self.db_name]
self.collection = self.db[self.collection_name]
print(f"[MONGO] Connected to {self.uri}, Database: {self.db_name}, Collection: {self.collection_name}")
return True
except errors.ServerSelectionTimeoutError as e:
print(f"[MONGO ERROR] Could not connect to MongoDB: {e}")
return False
except Exception as e:
print(f"[MONGO ERROR] An unexpected error occurred: {e}")
return False
def insert_chunk(self, content: str, metadata: Dict) -> bool:
"""Inserts a single chunk into the collection."""
if self.collection is None:
if not self.connect(): return False
try:
document = {
"content": content,
"metadata": metadata,
"timestamp": time.time()
}
self.collection.insert_one(document)
return True
except Exception as e:
print(f"[MONGO ERROR] Insertion failed: {e}")
return False
def find_relevant(self, query_dict: Dict, limit: int = 5) -> List[Dict]:
"""Performs a standard query search."""
if self.collection is None:
if not self.connect(): return []
try:
results = self.collection.find(query_dict).limit(limit)
return list(results)
except Exception as e:
print(f"[MONGO ERROR] Search failed: {e}")
return []
def clear(self) -> bool:
"""Clears the collection."""
if self.collection is None:
if not self.connect(): return False
try:
self.collection.delete_many({})
return True
except Exception as e:
print(f"[MONGO ERROR] Clear failed: {e}")
return False
def get_stats(self) -> Dict:
"""Returns collection statistics."""
if self.collection is None:
if not self.connect(): return {"error": "Not connected"}
try:
count = self.collection.count_documents({})
return {"count": count, "collection": self.collection_name, "db": self.db_name}
except Exception as e:
return {"error": str(e)}
def close(self):
"""Closes the connection."""
if self.client:
self.client.close()
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