🩹(backend) fix empty indexation batch

As we filter the empty documents from the batch during indexing some batches
can be empty and cause an error. Now they are ignored.
Add --batch-size argument to the index command.

Signed-off-by: Fabre Florian <ffabre@hybird.org>

src/backend/core/management/commands/index.py

@@ -17,6 +17,17 @@ class Command(BaseCommand):
 
     help = __doc__
 
+    def add_arguments(self, parser):
+        """Add argument to require forcing execution when not in debug mode."""
+        parser.add_argument(
+            "--batch-size",
+            action="store",
+            dest="batch_size",
+            type=int,
+            default=50,
+            help="Indexation query batch size",
+        )
+
     def handle(self, *args, **options):
         """Launch and log search index generation."""
         indexer = get_document_indexer()
@@ -26,9 +37,10 @@ class Command(BaseCommand):
 
         logger.info("Starting to regenerate Find index...")
         start = time.perf_counter()
+        batch_size = options["batch_size"]
 
         try:
-            count = indexer.index()
+            count = indexer.index(batch_size=batch_size)
         except Exception as err:
             raise CommandError("Unable to regenerate index") from err
 

src/backend/core/services/search_indexers.py

@@ -102,15 +102,11 @@ class BaseDocumentIndexer(ABC):
     `serialize_document()` and `push()` to define backend-specific behavior.
     """
 
-    def __init__(self, batch_size=None):
+    def __init__(self):
         """
         Initialize the indexer.
-
-        Args:
-            batch_size (int, optional): Number of documents per batch.
-                Defaults to settings.SEARCH_INDEXER_BATCH_SIZE.
         """
-        self.batch_size = batch_size or settings.SEARCH_INDEXER_BATCH_SIZE
+        self.batch_size = settings.SEARCH_INDEXER_BATCH_SIZE
         self.indexer_url = settings.SEARCH_INDEXER_URL
         self.indexer_secret = settings.SEARCH_INDEXER_SECRET
         self.search_url = settings.SEARCH_INDEXER_QUERY_URL
@@ -130,19 +126,26 @@ class BaseDocumentIndexer(ABC):
                 "SEARCH_INDEXER_QUERY_URL must be set in Django settings."
             )
 
-    def index(self, queryset=None):
+    def index(self, queryset=None, batch_size=None):
         """
         Fetch documents in batches, serialize them, and push to the search backend.
+
+        Args:
+            queryset (optional): Document queryset
+                Defaults to all documents without filter.
+            batch_size (int, optional): Number of documents per batch.
+                Defaults to settings.SEARCH_INDEXER_BATCH_SIZE.
         """
         last_id = 0
         count = 0
         queryset = queryset or models.Document.objects.all()
+        batch_size = batch_size or self.batch_size
 
         while True:
             documents_batch = list(
                 queryset.filter(
                     id__gt=last_id,
-                ).order_by("id")[: self.batch_size]
+                ).order_by("id")[:batch_size]
             )
 
             if not documents_batch:
@@ -158,8 +161,9 @@ class BaseDocumentIndexer(ABC):
                 if document.content or document.title
             ]
 
-            self.push(serialized_batch)
-            count += len(serialized_batch)
+            if serialized_batch:
+                self.push(serialized_batch)
+                count += len(serialized_batch)
 
         return count
 

src/backend/core/tests/test_services_search_indexers.py

@@ -299,6 +299,44 @@ def test_services_search_indexers_batches_pass_only_batch_accesses(
     assert seen_doc_ids == {str(d.id) for d in documents}
 
 
+@patch.object(SearchIndexer, "push")
+@pytest.mark.usefixtures("indexer_settings")
+def test_services_search_indexers_batch_size_argument(mock_push):
+    """
+    Documents indexing should be processed in batches,
+    batch_size overrides SEARCH_INDEXER_BATCH_SIZE
+    """
+    documents = factories.DocumentFactory.create_batch(5)
+
+    # Attach a single user access to each document
+    expected_user_subs = {}
+    for document in documents:
+        access = factories.UserDocumentAccessFactory(document=document)
+        expected_user_subs[str(document.id)] = str(access.user.sub)
+
+    assert SearchIndexer().index(batch_size=2) == 5
+
+    # Should be 3 batches: 2 + 2 + 1
+    assert mock_push.call_count == 3
+
+    seen_doc_ids = set()
+
+    for call in mock_push.call_args_list:
+        batch = call.args[0]
+        assert isinstance(batch, list)
+
+        for doc_json in batch:
+            doc_id = doc_json["id"]
+            seen_doc_ids.add(doc_id)
+
+            # Only one user expected per document
+            assert doc_json["users"] == [expected_user_subs[doc_id]]
+            assert doc_json["groups"] == []
+
+    # Make sure all 5 documents were indexed
+    assert seen_doc_ids == {str(d.id) for d in documents}
+
+
 @patch.object(SearchIndexer, "push")
 @pytest.mark.usefixtures("indexer_settings")
 def test_services_search_indexers_ignore_empty_documents(mock_push):
@@ -327,6 +365,25 @@ def test_services_search_indexers_ignore_empty_documents(mock_push):
     }
 
 
+@patch.object(SearchIndexer, "push")
+def test_services_search_indexers_skip_empty_batches(mock_push, indexer_settings):
+    """
+    Documents indexing batch can be empty if all the docs are empty.
+    """
+    indexer_settings.SEARCH_INDEXER_BATCH_SIZE = 2
+
+    document = factories.DocumentFactory()
+
+    # Only empty docs
+    factories.DocumentFactory.create_batch(5, content="", title="")
+
+    assert SearchIndexer().index() == 1
+    assert mock_push.call_count == 1
+
+    results = [doc["id"] for doc in mock_push.call_args[0][0]]
+    assert results == [str(document.id)]
+
+
 @patch.object(SearchIndexer, "push")
 @pytest.mark.usefixtures("indexer_settings")
 def test_services_search_indexers_ancestors_link_reach(mock_push):