feat: no result error (#137)

Co-authored-by: Anton <myprojectorterrypratchett@gmail.com>

Author: Sobes76rus

taskiq/exceptions.py

@@ -32,3 +32,7 @@ class ResultIsReadyError(ResultBackendError):
 
 class SecurityError(TaskiqError):
     """Security related exception."""
+
+
+class NoResultError(TaskiqError):
+    """Error if user does not want to set result."""

taskiq/receiver/receiver.py

@@ -11,6 +11,7 @@
 from taskiq.abc.broker import AsyncBroker
 from taskiq.abc.middleware import TaskiqMiddleware
 from taskiq.context import Context
+from taskiq.exceptions import NoResultError
 from taskiq.message import TaskiqMessage
 from taskiq.receiver.params_parser import parse_params
 from taskiq.result import TaskiqResult
@@ -125,10 +126,11 @@ async def callback(  # noqa: C901, WPS213
             if middleware.__class__.post_execute != TaskiqMiddleware.post_execute:
                 await maybe_awaitable(middleware.post_execute(taskiq_msg, result))
         try:
-            await self.broker.result_backend.set_result(taskiq_msg.task_id, result)
-            for middleware in self.broker.middlewares:
-                if middleware.__class__.post_save != TaskiqMiddleware.post_save:
-                    await maybe_awaitable(middleware.post_save(taskiq_msg, result))
+            if not isinstance(result.error, NoResultError):
+                await self.broker.result_backend.set_result(taskiq_msg.task_id, result)
+                for middleware in self.broker.middlewares:
+                    if middleware.__class__.post_save != TaskiqMiddleware.post_save:
+                        await maybe_awaitable(middleware.post_save(taskiq_msg, result))
         except Exception as exc:
             logger.exception(
                 "Can't set result in result backend. Cause: %s",

tests/cli/worker/test_receiver.py

@@ -8,6 +8,7 @@
 from taskiq.abc.broker import AsyncBroker
 from taskiq.abc.middleware import TaskiqMiddleware
 from taskiq.brokers.inmemory_broker import InMemoryBroker
+from taskiq.exceptions import NoResultError, TaskiqResultTimeoutError
 from taskiq.message import TaskiqMessage
 from taskiq.receiver import Receiver
 from taskiq.result import TaskiqResult
@@ -284,3 +285,52 @@ async def task_sem() -> int:
     assert sem_num == max_async_tasks
     await listen_task
     assert sem_num == max_async_tasks + 2
+
+
+@pytest.mark.anyio
+async def test_no_result_error() -> None:
+    broker = InMemoryBroker()
+    executed = asyncio.Event()
+
+    @broker.task
+    async def task_no_result() -> int:
+        executed.set()
+        raise NoResultError()
+
+    task = await task_no_result.kiq()
+    with pytest.raises(TaskiqResultTimeoutError):
+        await task.wait_result(timeout=1)
+
+    assert executed.is_set()
+    assert not broker._running_tasks
+
+
+@pytest.mark.anyio
+async def test_result() -> None:
+    broker = InMemoryBroker()
+
+    @broker.task
+    async def task_no_result() -> str:
+        return "some value"
+
+    task = await task_no_result.kiq()
+    resp = await task.wait_result(timeout=1)
+
+    assert resp.return_value == "some value"
+    assert not broker._running_tasks
+
+
+@pytest.mark.anyio
+async def test_error_result() -> None:
+    broker = InMemoryBroker()
+
+    @broker.task
+    async def task_no_result() -> str:
+        raise ValueError("some error")
+
+    task = await task_no_result.kiq()
+    resp = await task.wait_result(timeout=1)
+
+    assert resp.return_value is None
+    assert not broker._running_tasks
+    assert isinstance(resp.error, ValueError)