Make the recursion limit workaround dependent on the aiida-core version (#72)

With aiida-core v2.8.0 we switched from nest-asyncio to greenlet and therefore
do not need to dynamically increase the recursion limit anymore.

Author: agoscinski

src/aiida_pythonjob/decorator.py

@@ -7,16 +7,24 @@
 import typing as t
 from typing import List
 
-from aiida.engine.processes.functions import FunctionType, get_stack_size
+import aiida
+from aiida.engine.processes.functions import FunctionType
 from aiida.manage import get_manager
 from aiida.orm import ProcessNode
 from node_graph.socket_spec import SocketSpec
+from packaging.version import parse as parse_version
 
 from aiida_pythonjob.calculations.pyfunction import PyFunction
 from aiida_pythonjob.launch import create_inputs, prepare_pyfunction_inputs
 
 LOGGER = logging.getLogger(__name__)
 
+_AIIDA_VERSION = parse_version(aiida.__version__)
+_NEEDS_RECURSION_LIMIT_WORKAROUND = _AIIDA_VERSION < parse_version("2.8.0")
+
+if _NEEDS_RECURSION_LIMIT_WORKAROUND:
+    from aiida.engine.processes.functions import get_stack_size
+
 
 # The following code is modified from the aiida-core.engine.processes.functions module
 def pyfunction(
@@ -42,25 +50,26 @@ def run_get_node(*args, **kwargs) -> tuple[dict[str, t.Any] | None, "ProcessNode
             :param kwargs: input keyword arguments to construct the FunctionProcess
             :return: tuple of the outputs of the process and the process node
             """
-            frame_delta = 1000
-            frame_count = get_stack_size()
-            stack_limit = sys.getrecursionlimit()
-            LOGGER.info("Executing process function, current stack status: %d frames of %d", frame_count, stack_limit)
-
-            # If the current frame count is more than 80% of the stack limit, or comes within 200 frames, increase the
-            # stack limit by ``frame_delta``.
-            if frame_count > min(0.8 * stack_limit, stack_limit - 200):
-                LOGGER.warning(
-                    "Current stack contains %d frames which is close to the limit of %d. Increasing the limit by %d",
-                    frame_count,
-                    stack_limit,
-                    frame_delta,
+            if _NEEDS_RECURSION_LIMIT_WORKAROUND:
+                frame_delta = 1000
+                frame_count = get_stack_size()
+                stack_limit = sys.getrecursionlimit()
+                LOGGER.info(
+                    "Executing process function, current stack status: %d frames of %d", frame_count, stack_limit
                 )
-                sys.setrecursionlimit(stack_limit + frame_delta)
+
+                if frame_count > min(0.8 * stack_limit, stack_limit - 200):
+                    LOGGER.warning(
+                        "Current stack contains %d frames which is close to the limit of %d. Increasing the limit by %d",
+                        frame_count,
+                        stack_limit,
+                        frame_delta,
+                    )
+                    sys.setrecursionlimit(stack_limit + frame_delta)
 
             manager = get_manager()
             runner = manager.get_runner()
-            # # Remove all the known inputs from the kwargs
+            # Remove all the known inputs from the kwargs
             outputs_spec = kwargs.pop("outputs_spec", None) or outputs
             inputs_spec = kwargs.pop("inputs_spec", None) or inputs
             metadata = kwargs.pop("metadata", None)