feat(cloud): harden multi-tenant runtime resources

tests/unit_tests/persistence/test_postgresql_database.py

@@ -13,11 +13,13 @@ from langbot.pkg.persistence.databases import postgresql
 @pytest.mark.asyncio
 async def test_postgresql_manager_parses_explicit_url_without_string_reassembly(monkeypatch) -> None:
     captured = None
+    captured_options = None
     sentinel_engine = object()
 
-    def create_engine(url):
-        nonlocal captured
+    def create_engine(url, **options):
+        nonlocal captured, captured_options
         captured = url
+        captured_options = options
         return sentinel_engine
 
     monkeypatch.setattr(postgresql.sqlalchemy_asyncio, 'create_async_engine', create_engine)
@@ -40,6 +42,13 @@ async def test_postgresql_manager_parses_explicit_url_without_string_reassembly(
     assert captured.password == 'p@ss'
     assert captured.query['ssl'] == 'require'
     assert 'sslmode' not in captured.query
+    assert captured_options == {
+        'pool_size': 10,
+        'max_overflow': 10,
+        'pool_timeout': 30,
+        'pool_recycle': 1800,
+        'pool_pre_ping': True,
+    }
     assert manager.engine is sentinel_engine
 
 
@@ -47,7 +56,7 @@ async def test_postgresql_manager_parses_explicit_url_without_string_reassembly(
 async def test_postgresql_manager_builds_structured_url_with_special_password(monkeypatch) -> None:
     captured = None
 
-    def create_engine(url):
+    def create_engine(url, **_options):
         nonlocal captured
         captured = url
         return object()
@@ -76,6 +85,60 @@ async def test_postgresql_manager_builds_structured_url_with_special_password(mo
     assert captured.database == 'langbot'
 
 
+@pytest.mark.asyncio
+async def test_postgresql_manager_applies_explicit_bounded_pool_options(monkeypatch) -> None:
+    captured_options = None
+
+    def create_engine(_url, **options):
+        nonlocal captured_options
+        captured_options = options
+        return object()
+
+    monkeypatch.setattr(postgresql.sqlalchemy_asyncio, 'create_async_engine', create_engine)
+    ap = SimpleNamespace(
+        instance_config=SimpleNamespace(
+            data={
+                'database': {
+                    'postgresql': {
+                        'pool_size': 24,
+                        'max_overflow': 0,
+                        'pool_timeout_seconds': 7,
+                        'pool_recycle_seconds': 600,
+                    }
+                }
+            }
+        )
+    )
+
+    await postgresql.PostgreSQLDatabaseManager(ap).initialize()
+
+    assert captured_options == {
+        'pool_size': 24,
+        'max_overflow': 0,
+        'pool_timeout': 7,
+        'pool_recycle': 600,
+        'pool_pre_ping': True,
+    }
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    ('name', 'value'),
+    [
+        ('pool_size', 0),
+        ('pool_size', True),
+        ('max_overflow', -1),
+        ('pool_timeout_seconds', 0),
+        ('pool_recycle_seconds', '1800'),
+    ],
+)
+async def test_postgresql_manager_rejects_invalid_pool_options(name, value) -> None:
+    ap = SimpleNamespace(instance_config=SimpleNamespace(data={'database': {'postgresql': {name: value}}}))
+
+    with pytest.raises(ValueError, match=rf'database\.postgresql\.{name}'):
+        await postgresql.PostgreSQLDatabaseManager(ap).initialize()
+
+
 @pytest.mark.asyncio
 async def test_postgresql_manager_rejects_non_postgresql_url_without_echoing_secret() -> None:
     ap = SimpleNamespace(