feat: support aget_docs_by_ids

lightrag/lightrag.py

@@ -1517,6 +1517,70 @@ class LightRAG:
         """
         return await self.doc_status.get_docs_by_status(status)
 
+    async def aget_docs_by_ids(
+        self, ids: str | list[str]
+    ) -> dict[str, DocProcessingStatus]:
+        """Retrieves the processing status for one or more documents by their IDs.
+
+        Args:
+            ids: A single document ID (string) or a list of document IDs (list of strings).
+
+        Returns:
+            A dictionary where keys are the document IDs for which a status was found,
+            and values are the corresponding DocProcessingStatus objects. IDs that
+            are not found in the storage will be omitted from the result dictionary.
+        """
+        if isinstance(ids, str):
+            # Ensure input is always a list of IDs for uniform processing
+            id_list = [ids]
+        elif (
+            ids is None
+        ):  # Handle potential None input gracefully, although type hint suggests str/list
+            logger.warning(
+                "aget_docs_by_ids called with None input, returning empty dict."
+            )
+            return {}
+        else:
+            # Assume input is already a list if not a string
+            id_list = ids
+
+        # Return early if the final list of IDs is empty
+        if not id_list:
+            logger.debug("aget_docs_by_ids called with an empty list of IDs.")
+            return {}
+
+        # Create tasks to fetch document statuses concurrently using the doc_status storage
+        tasks = [self.doc_status.get_by_id(doc_id) for doc_id in id_list]
+        # Execute tasks concurrently and gather the results. Results maintain order.
+        # Type hint indicates results can be DocProcessingStatus or None if not found.
+        results_list: list[Optional[DocProcessingStatus]] = await asyncio.gather(*tasks)
+
+        # Build the result dictionary, mapping found IDs to their statuses
+        found_statuses: dict[str, DocProcessingStatus] = {}
+        # Keep track of IDs for which no status was found (for logging purposes)
+        not_found_ids: list[str] = []
+
+        # Iterate through the results, correlating them back to the original IDs
+        for i, status_obj in enumerate(results_list):
+            doc_id = id_list[
+                i
+            ]  # Get the original ID corresponding to this result index
+            if status_obj:
+                # If a status object was returned (not None), add it to the result dict
+                found_statuses[doc_id] = status_obj
+            else:
+                # If status_obj is None, the document ID was not found in storage
+                not_found_ids.append(doc_id)
+
+        # Log a warning if any of the requested document IDs were not found
+        if not_found_ids:
+            logger.warning(
+                f"Document statuses not found for the following IDs: {not_found_ids}"
+            )
+
+        # Return the dictionary containing statuses only for the found document IDs
+        return found_statuses
+
     # TODO: Deprecated (Deleting documents can cause hallucinations in RAG.)
     # Document delete is not working properly for most of the storage implementations.
     async def adelete_by_doc_id(self, doc_id: str) -> None: