Remove the use of deprecated pkg_resources in the importutil and tested compatibility with HSDK v4.0 CUDA 12 (#579)

* Fixed import_util and tested the SDK with HSDK v4.0 Cuda 12

Signed-off-by: M Q <mingmelvinq@nvidia.com>

* Addressed commnent on PEP 503 compliance

Signed-off-by: M Q <mingmelvinq@nvidia.com>

* Address comment on name collision

Signed-off-by: M Q <mingmelvinq@nvidia.com>

* Update the license date range

Signed-off-by: M Q <mingmelvinq@nvidia.com>

* Address nits

Signed-off-by: M Q <mingmelvinq@nvidia.com>

* Address coderabbit review comments

Signed-off-by: M Q <mingmelvinq@nvidia.com>

* Address more nits

Signed-off-by: M Q <mingmelvinq@nvidia.com>

* Even more minor nits

Signed-off-by: M Q <mingmelvinq@nvidia.com>

---------

Signed-off-by: M Q <mingmelvinq@nvidia.com>

Author: MMelQin

monai/deploy/utils/importutil.py

@@ -1,4 +1,4 @@
-# Copyright 2021-2022 MONAI Consortium
+# Copyright 2021-2026 MONAI Consortium
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
@@ -10,14 +10,67 @@
 # limitations under the License.
 
 import inspect
+import re
 import runpy
 import sys
 import warnings
+from functools import lru_cache
 from importlib import import_module
+from importlib.metadata import distributions
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Callable, Dict, List, Optional, Tuple, Type, Union
 
-import pkg_resources
+
+def _normalize_project_name(name: str) -> str:
+    """Normalize project name for lookup (PEP 503).
+
+    PEP 503 normalizes by lowercasing and replacing any run of [-_.]
+    with a single hyphen, so distribution key matching works for names
+    containing dots or mixed separators.
+    """
+    return re.sub(r"[-_.]+", "-", name.lower())
+
+
+@lru_cache(maxsize=1)
+def _get_working_set() -> Dict[str, Any]:
+    """Build a dict of distribution name -> dist-like object using importlib.metadata.
+
+    Cached so we do not rescan on every call. First-discovered distribution
+    is kept for each normalized name when multiple distributions match.
+    """
+    result: Dict[str, Any] = {}
+    for d in distributions():
+        key = _normalize_project_name(d.name)
+        if key not in result:
+            result[key] = _DistributionAdapter(d)
+    return result
+
+
+class _DistributionAdapter:
+    """Adapter so importlib.metadata Distribution can be used like pkg_resources Distribution."""
+
+    def __init__(self, dist: Any) -> None:
+        self._dist = dist
+        path = getattr(dist, "path", getattr(dist, "_path", None))
+        self._path = Path(path).resolve() if path else None
+
+    @property
+    def key(self) -> str:
+        return _normalize_project_name(self._dist.name)
+
+    @property
+    def egg_info(self) -> Optional[Path]:
+        return self._path
+
+    @property
+    def module_path(self) -> str:
+        if self._path:
+            return str(self._path.parent)
+        return ""
+
+    def requires(self) -> List[str]:
+        return list(self._dist.requires or [])
+
 
 if TYPE_CHECKING:
     from monai.deploy.core import Application
@@ -295,9 +348,9 @@ def __init__(self, *_args, **kwargs):
 
 
 def is_dist_editable(project_name: str) -> bool:
-    distributions: Dict = {v.key: v for v in pkg_resources.working_set}
-    dist: Any = distributions.get(project_name)
-    if not hasattr(dist, "egg_info"):
+    working_set = _get_working_set()
+    dist: Any = working_set.get(_normalize_project_name(project_name))
+    if not hasattr(dist, "egg_info") or dist.egg_info is None:
         return False
     egg_info = Path(dist.egg_info)
     if egg_info.is_dir():
@@ -314,15 +367,15 @@ def is_dist_editable(project_name: str) -> bool:
                     try:
                         if data["dir_info"]["editable"]:
                             return True
-                    except KeyError:
+                    except (KeyError, TypeError):
                         pass
     return False
 
 
 def dist_module_path(project_name: str) -> str:
-    distributions: Dict = {v.key: v for v in pkg_resources.working_set}
-    dist: Any = distributions.get(project_name)
-    if hasattr(dist, "egg_info"):
+    working_set = _get_working_set()
+    dist: Any = working_set.get(_normalize_project_name(project_name))
+    if hasattr(dist, "egg_info") and dist.egg_info is not None:
         egg_info = Path(dist.egg_info)
         if egg_info.is_dir() and egg_info.suffix == ".dist-info":
             if (egg_info / "direct_url.json").exists():
@@ -336,7 +389,7 @@ def dist_module_path(project_name: str) -> str:
                         file_url = data["url"]
                         if file_url.startswith("file://"):
                             return str(file_url[7:])
-                    except KeyError:
+                    except (KeyError, TypeError, AttributeError):
                         pass
 
     if hasattr(dist, "module_path"):
@@ -345,17 +398,14 @@ def dist_module_path(project_name: str) -> str:
 
 
 def is_module_installed(project_name: str) -> bool:
-    distributions: Dict = {v.key: v for v in pkg_resources.working_set}
-    dist: Any = distributions.get(project_name)
-    if dist:
-        return True
-    else:
-        return False
+    working_set = _get_working_set()
+    dist: Any = working_set.get(_normalize_project_name(project_name))
+    return dist is not None
 
 
 def dist_requires(project_name: str) -> List[str]:
-    distributions: Dict = {v.key: v for v in pkg_resources.working_set}
-    dist: Any = distributions.get(project_name)
+    working_set = _get_working_set()
+    dist: Any = working_set.get(_normalize_project_name(project_name))
     if hasattr(dist, "requires"):
         return [str(req) for req in dist.requires()]
     return []