"""Scanner task for vector database synchronization. Periodically scans enabled users' content and queues changed documents for processing. """ import logging import time from dataclasses import dataclass import anyio from anyio.abc import TaskStatus from anyio.streams.memory import MemoryObjectSendStream from qdrant_client.models import FieldCondition, Filter, MatchValue from nextcloud_mcp_server.client import NextcloudClient from nextcloud_mcp_server.config import get_settings from nextcloud_mcp_server.observability.metrics import record_vector_sync_scan from nextcloud_mcp_server.observability.tracing import trace_operation from nextcloud_mcp_server.vector.qdrant_client import get_qdrant_client logger = logging.getLogger(__name__) @dataclass class DocumentTask: """Document task for processing queue.""" user_id: str doc_id: str doc_type: str # "note", "file", "calendar" operation: str # "index" or "delete" modified_at: int # Track documents potentially deleted (grace period before actual deletion) # Format: {(user_id, doc_id): first_missing_timestamp} _potentially_deleted: dict[tuple[str, str], float] = {} async def get_last_indexed_timestamp(user_id: str) -> int | None: """Get the most recent indexed_at timestamp for user's notes in Qdrant. This timestamp can be used as pruneBefore parameter to optimize data transfer when fetching notes - only notes modified after this timestamp will be sent with full data. Args: user_id: User to query Returns: Unix timestamp of most recently indexed note, or None if no notes indexed yet """ try: qdrant_client = await get_qdrant_client() # Query for user's notes, ordered by indexed_at descending, limit 1 scroll_result = await qdrant_client.scroll( collection_name=get_settings().get_collection_name(), scroll_filter=Filter( must=[ FieldCondition(key="user_id", match=MatchValue(value=user_id)), FieldCondition(key="doc_type", match=MatchValue(value="note")), ] ), with_payload=["indexed_at"], with_vectors=False, limit=10000, # Get all to find max ) # Find max indexed_at across all results num_points = len(scroll_result[0]) if scroll_result[0] else 0 logger.info(f"Found {num_points} indexed notes in Qdrant for user {user_id}") if scroll_result[0]: timestamps = [ point.payload.get("indexed_at", 0) for point in scroll_result[0] ] max_timestamp = max(timestamps) logger.info( f"Max indexed_at: {max_timestamp}, timestamps sample: {timestamps[:3]}" ) return int(max_timestamp) if max_timestamp > 0 else None logger.info(f"No indexed notes found for user {user_id}") return None except Exception as e: logger.warning(f"Failed to get last indexed timestamp: {e}", exc_info=True) return None async def scanner_task( send_stream: MemoryObjectSendStream[DocumentTask], shutdown_event: anyio.Event, wake_event: anyio.Event, nc_client: NextcloudClient, user_id: str, *, task_status: TaskStatus = anyio.TASK_STATUS_IGNORED, ): """ Periodic scanner that detects changed documents for enabled user. For BasicAuth mode, scans a single user with credentials available at runtime. Args: send_stream: Stream to send changed documents to processors shutdown_event: Event signaling shutdown wake_event: Event to trigger immediate scan nc_client: Authenticated Nextcloud client user_id: User to scan task_status: Status object for signaling task readiness """ logger.info(f"Scanner task started for user: {user_id}") settings = get_settings() # Signal that the task has started and is ready task_status.started() async with send_stream: while not shutdown_event.is_set(): try: # Scan user documents await scan_user_documents( user_id=user_id, send_stream=send_stream, nc_client=nc_client, ) except Exception as e: logger.error(f"Scanner error: {e}", exc_info=True) # Sleep until next interval or wake event try: with anyio.move_on_after(settings.vector_sync_scan_interval): # Wait for wake event or shutdown (whichever comes first) await wake_event.wait() except anyio.get_cancelled_exc_class(): # Shutdown, exit loop break logger.info("Scanner task stopped - stream closed") async def scan_user_documents( user_id: str, send_stream: MemoryObjectSendStream[DocumentTask], nc_client: NextcloudClient, initial_sync: bool = False, ): """ Scan a single user's documents and send changes to processor stream. Args: user_id: User to scan send_stream: Stream to send changed documents to processors nc_client: Authenticated Nextcloud client initial_sync: If True, send all documents (first-time sync) """ import random scan_id = random.randint(1000, 9999) logger.info( f"[SCAN-{scan_id}] Starting scan for user: {user_id}, initial_sync={initial_sync}" ) with trace_operation( "vector_sync.scan_user_documents", attributes={ "vector_sync.operation": "scan", "vector_sync.user_id": user_id, "vector_sync.initial_sync": initial_sync, "vector_sync.scan_id": scan_id, }, ): # Calculate prune timestamp for optimized data transfer # Only notes modified after this will be sent with full data prune_before = ( None if initial_sync else await get_last_indexed_timestamp(user_id) ) if prune_before: logger.info( f"[SCAN-{scan_id}] Using pruneBefore={prune_before} to optimize data transfer" ) # Get indexed state from Qdrant first (for incremental sync) indexed_docs = {} if not initial_sync: qdrant_client = await get_qdrant_client() scroll_result = await qdrant_client.scroll( collection_name=get_settings().get_collection_name(), scroll_filter=Filter( must=[ FieldCondition(key="user_id", match=MatchValue(value=user_id)), FieldCondition(key="doc_type", match=MatchValue(value="note")), ] ), with_payload=["doc_id", "indexed_at"], with_vectors=False, limit=10000, ) indexed_docs = { point.payload["doc_id"]: point.payload["indexed_at"] for point in scroll_result[0] } logger.debug(f"Found {len(indexed_docs)} indexed documents in Qdrant") # Stream notes from Nextcloud and process immediately note_count = 0 queued = 0 nextcloud_doc_ids = set() async for note in nc_client.notes.get_all_notes(prune_before=prune_before): note_count += 1 doc_id = str(note["id"]) nextcloud_doc_ids.add(doc_id) modified_at = note.get("modified", 0) if initial_sync: # Send everything on first sync await send_stream.send( DocumentTask( user_id=user_id, doc_id=doc_id, doc_type="note", operation="index", modified_at=modified_at, ) ) queued += 1 else: # Incremental sync: compare with indexed state indexed_at = indexed_docs.get(doc_id) # If document reappeared, remove from potentially_deleted doc_key = (user_id, doc_id) if doc_key in _potentially_deleted: logger.debug( f"Document {doc_id} reappeared, removing from deletion grace period" ) del _potentially_deleted[doc_key] # Send if never indexed or modified since last index if indexed_at is None or modified_at > indexed_at: await send_stream.send( DocumentTask( user_id=user_id, doc_id=doc_id, doc_type="note", operation="index", modified_at=modified_at, ) ) queued += 1 # Log and record metrics after streaming logger.info(f"[SCAN-{scan_id}] Found {note_count} notes for {user_id}") record_vector_sync_scan(note_count) if initial_sync: logger.info(f"Sent {queued} documents for initial sync: {user_id}") return # Check for deleted documents (in Qdrant but not in Nextcloud) # Use grace period: only delete after 2 consecutive scans confirm absence settings = get_settings() grace_period = ( settings.vector_sync_scan_interval * 1.5 ) # Allow 1.5 scan intervals current_time = time.time() for doc_id in indexed_docs: if doc_id not in nextcloud_doc_ids: doc_key = (user_id, doc_id) if doc_key in _potentially_deleted: # Already marked as potentially deleted, check if grace period elapsed first_missing_time = _potentially_deleted[doc_key] time_missing = current_time - first_missing_time if time_missing >= grace_period: # Grace period elapsed, send for deletion logger.info( f"Document {doc_id} missing for {time_missing:.1f}s " f"(>{grace_period:.1f}s grace period), sending deletion" ) await send_stream.send( DocumentTask( user_id=user_id, doc_id=doc_id, doc_type="note", operation="delete", modified_at=0, ) ) queued += 1 # Remove from tracking after sending deletion del _potentially_deleted[doc_key] else: logger.debug( f"Document {doc_id} still missing " f"({time_missing:.1f}s/{grace_period:.1f}s grace period)" ) else: # First time missing, add to grace period tracking logger.debug( f"Document {doc_id} missing for first time, starting grace period" ) _potentially_deleted[doc_key] = current_time if queued > 0: logger.info(f"Sent {queued} documents for incremental sync: {user_id}") else: logger.debug(f"No changes detected for {user_id}")