Fixing race condition in ec2 inventory plugin (#59638)

* Fixing race condition in ec2 inventory plugin

Co-Authored-By: Sviatoslav Sydorenko <wk.cvs.github@sydorenko.org.ua>

* Fixing code block according to suggestion

* Adding changelog fragment

changelogs/fragments/59638-aws-ec2-plugin-fix-race.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+  - aws_ec2 inventory plugin - fixed race condition when trying to fetch IAM instance profile (role) credentials (https://github.com/ansible/ansible/pull/59638)

lib/ansible/plugins/inventory/aws_ec2.py

@@ -579,10 +579,14 @@ class InventoryModule(BaseInventoryPlugin, Constructable, Cacheable):
 
         if not self.boto_profile and not (self.aws_access_key_id and self.aws_secret_access_key):
             session = botocore.session.get_session()
-            if session.get_credentials() is not None:
-                self.aws_access_key_id = session.get_credentials().access_key
-                self.aws_secret_access_key = session.get_credentials().secret_key
-                self.aws_security_token = session.get_credentials().token
+            try:
+                credentials = session.get_credentials().get_frozen_credentials()
+            except AttributeError:
+                pass
+            else:
+                self.aws_access_key_id = credentials.access_key
+                self.aws_secret_access_key = credentials.secret_key
+                self.aws_security_token = credentials.token
 
         if not self.boto_profile and not (self.aws_access_key_id and self.aws_secret_access_key):
             raise AnsibleError("Insufficient boto credentials found. Please provide them in your "