Raise TypeError on get(async_factory)

Fixes #21

CHANGELOG.md

@@ -20,6 +20,9 @@ You can find our backwards-compatibility policy [here](https://github.com/hynek/
 - Factory results of None are now treated like every other result and cached.
   [#22](https://github.com/hynek/svcs/pull/22)
 
+- Calling `Container.get()` on a service that has an async factory now raises a `TypeError`.
+  [#21](https://github.com/hynek/svcs/pull/21)
+
 
 ### Added
 

src/svcs/_core.py

@@ -652,6 +652,10 @@ def get(self, *svc_types: type) -> object:
                 continue
 
             rs = self.registry.get_registered_service_for(svc_type)
+            if rs.is_async:
+                msg = "Please use `aget()` for async factories."
+                raise TypeError(msg)
+
             svc = rs.factory(self) if rs.takes_container else rs.factory()
 
             if isinstance(svc, Generator):

tests/test_integration.py

@@ -3,12 +3,13 @@
 # SPDX-License-Identifier: MIT
 
 import asyncio
+import re
 
 import pytest
 
 import svcs
 
-from .fake_factories import nop
+from .fake_factories import async_int_factory, async_str_cleanup_factory, nop
 from .ifaces import AnotherService, Interface, Service, YetAnotherService
 
 
@@ -200,6 +201,22 @@ def factory():
     assert 1 == i
 
 
+@pytest.mark.parametrize(
+    "factory", [async_int_factory, async_str_cleanup_factory]
+)
+def test_get_on_async_factory_raises_type_error(registry, container, factory):
+    """
+    get() on an async factory raises a TypeError.
+    """
+
+    registry.register_factory(Service, factory)
+
+    with pytest.raises(
+        TypeError, match=re.escape("Please use `aget()` for async factories.")
+    ):
+        container.get(Service)
+
+
 @pytest.mark.asyncio()
 class TestAsync:
     async def test_async_factory(self, registry, container):