Move module dependency functions outside of module (#342)

Move module dependency functions outside of module

SUMMARY

This moves the has_at_least and requires functions that had been on the
module to top level functions. The functions on the module now call
these with a few added bits of functionality.
Moving these functions to the top level and removing their requirement
on having a module makes them usable in situations where we may not yet
have a module, such as during client creation.

ISSUE TYPE

COMPONENT NAME

ADDITIONAL INFORMATION

Reviewed-by: Alina Buzachis <None>
Reviewed-by: None <None>

plugins/module_utils/k8s/client.py

@@ -3,7 +3,6 @@
 
 import os
 import hashlib
-from distutils.version import LooseVersion
 from typing import Any, Dict, List, Optional
 
 from ansible.module_utils.six import iteritems, string_types
@@ -13,6 +12,7 @@ from ansible_collections.kubernetes.core.plugins.module_utils.args_common import
     AUTH_ARG_SPEC,
     AUTH_PROXY_HEADERS_SPEC,
 )
+from ansible_collections.kubernetes.core.plugins.module_utils.k8s.core import requires
 
 try:
     from ansible_collections.kubernetes.core.plugins.module_utils import (
@@ -40,20 +40,9 @@ except ImportError:
     pass
 
 
-module = None
 _pool = {}
 
 
-def _requires_kubernetes_at_least(version: str):
-    if module:
-        module.requires("kubernetes", version)
-    else:
-        if LooseVersion(kubernetes.__version__) < LooseVersion(version):
-            raise Exception(
-                f"kubernetes >= {version} is required to use in-memory kubeconfig."
-            )
-
-
 def _create_auth_spec(module=None, **kwargs) -> Dict:
     auth: Dict = {}
     # If authorization variables aren't defined, look for them in environment variables
@@ -97,7 +86,6 @@ def _load_config(auth: Dict) -> None:
         if isinstance(kubeconfig, string_types):
             kubernetes.config.load_kube_config(config_file=kubeconfig, **optional_arg)
         elif isinstance(kubeconfig, dict):
-            _requires_kubernetes_at_least("17.17.0")
             kubernetes.config.load_kube_config_from_dict(
                 config_dict=kubeconfig, **optional_arg
             )
@@ -241,6 +229,11 @@ class K8SClient:
 
 def get_api_client(module=None, **kwargs: Optional[Any]) -> K8SClient:
     auth_spec = _create_auth_spec(module, **kwargs)
+    if isinstance(auth_spec.get("kubeconfig"), dict):
+        if module:
+            module.requires("kubernetes", "17.17.0", "to use in-memory config")
+        else:
+            requires("kubernetes", "17.17.0", "to use in-memory config")
     configuration = _create_configuration(auth_spec)
     client = create_api_client(configuration)