Test max_concurrent

Author: dandavison

tests/nexus/test_worker.py

@@ -0,0 +1,79 @@
+from __future__ import annotations
+
+import asyncio
+import uuid
+from datetime import timedelta
+
+import nexusrpc.handler
+import pytest
+
+from temporalio import workflow
+from temporalio.client import Client
+from tests.helpers import new_worker
+from tests.helpers.nexus import create_nexus_endpoint, make_nexus_endpoint_name
+
+
+@workflow.defn
+class NexusCallerWorkflow:
+    """Workflow that calls a Nexus operation."""
+
+    @workflow.run
+    async def run(self, id: int) -> None:
+        nexus_client = workflow.create_nexus_client(
+            endpoint=make_nexus_endpoint_name(workflow.info().task_queue),
+            service="MaxConcurrentTestService",
+        )
+
+        await nexus_client.execute_operation(
+            "op",
+            id,
+            schedule_to_close_timeout=timedelta(seconds=60),
+        )
+
+
+@pytest.mark.parametrize(
+    ["num_nexus_operations", "max_concurrent_nexus_tasks", "expected_num_executed"],
+    [(1, 1, 1), (2, 1, 1), (43, 42, 42), (43, 44, 43)],
+)
+async def test_max_concurrent_nexus_tasks(
+    client: Client,
+    max_concurrent_nexus_tasks: int,
+    num_nexus_operations: int,
+    expected_num_executed: int,
+):
+    ids = []
+    event = asyncio.Event()
+
+    @nexusrpc.handler.service_handler
+    class MaxConcurrentTestService:
+        @nexusrpc.handler.sync_operation
+        async def op(
+            self, _ctx: nexusrpc.handler.StartOperationContext, id: int
+        ) -> None:
+            ids.append(id)
+            await event.wait()
+
+    async with new_worker(
+        client,
+        NexusCallerWorkflow,
+        nexus_service_handlers=[MaxConcurrentTestService()],
+        max_concurrent_nexus_tasks=max_concurrent_nexus_tasks,
+    ) as worker:
+        await create_nexus_endpoint(worker.task_queue, client)
+
+        coros = [
+            client.execute_workflow(
+                NexusCallerWorkflow.run,
+                i,
+                id=str(uuid.uuid4()),
+                task_queue=worker.task_queue,
+            )
+            for i in range(num_nexus_operations)
+        ]
+        try:
+            await asyncio.wait_for(asyncio.gather(*coros), timeout=3)
+        except asyncio.TimeoutError:
+            pass
+        event.set()
+        assert len(set(ids)) == len(ids)
+        assert len(ids) == expected_num_executed