add

order-events/app/events/assign_tenant_cnpj.py

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+from aws_lambda_powertools import Logger
+from aws_lambda_powertools.utilities.data_classes import (
+    EventBridgeEvent,
+    event_source,
+)
+from aws_lambda_powertools.utilities.typing import LambdaContext
+from layercake.dateutils import now
+from layercake.dynamodb import (
+    DynamoDBPersistenceLayer,
+    KeyPair,
+    SortKey,
+)
+
+from boto3clients import dynamodb_client
+from config import ORDER_TABLE, USER_TABLE
+
+logger = Logger(__name__)
+user_layer = DynamoDBPersistenceLayer(USER_TABLE, dynamodb_client)
+order_layer = DynamoDBPersistenceLayer(ORDER_TABLE, dynamodb_client)
+
+
+@event_source(data_class=EventBridgeEvent)
+@logger.inject_lambda_context
+def lambda_handler(event: EventBridgeEvent, context: LambdaContext) -> bool:
+    new_image = event.detail['new_image']
+    now_ = now()
+    ids = user_layer.collection.get_items(
+        KeyPair(
+            pk='cnpj',
+            sk=SortKey(new_image['cnpj'], path_spec='user_id'),
+            rename_key='org_id',
+        )
+        + KeyPair(
+            pk='email',
+            sk=SortKey(new_image['email'], path_spec='user_id'),
+            rename_key='user_id',
+        ),
+        flatten_top=False,
+    )
+
+    # Sometimes the function executes before the user insertion completes,
+    # so an exception is raised to trigger a retry.
+    if len(ids) < 2:
+        raise ValueError('IDs not found.')
+
+    with order_layer.transact_writer() as transact:
+        transact.update(
+            key=KeyPair(new_image['id'], '0'),
+            update_expr='SET metadata__tenant_id = :tenant_id, \
+                             metadata__related_ids = :related_ids, \
+                             update_date = :update_date',
+            expr_attr_values={
+                ':tenant_id': ids['org_id'],
+                ':related_ids': set(ids.values()),
+                ':update_date': now_,
+            },
+        )
+        transact.put(
+            item={
+                'id': new_image['id'],
+                'sk': 'metadata#tenant',
+                'tenant_id': f'ORG#{ids["org_id"]}',
+                'create_date': now_,
+            }
+        )
+
+        for k, v in ids.items():
+            kind = k.removesuffix('_id')
+            transact.put(
+                item={
+                    'id': new_image['id'],
+                    'sk': f'related_ids#{kind}',  # e.g. related_ids#user
+                    'create_date': now_,
+                    k: v,
+                }
+            )
+
+    return True