elasticache_parameter_group: fix documentation and exception handling - fixes #23709 (#23718)

* fix documentation and correct exception handling

* follow AWS exception guidelines

* fix parameter_group_family req; only needed when creating cache parameter group

make pep8 and remove from legacy files

lib/ansible/modules/cloud/amazon/elasticache_parameter_group.py

@@ -32,8 +32,9 @@ options:
   group_family:
     description:
       - The name of the cache parameter group family that the cache parameter group can be used with.
+        Required when creating a cache parameter group.
     choices: ['memcached1.4', 'redis2.6', 'redis2.8', 'redis3.2']
-    required: yes
+    required: no
   name:
     description:
      - A user-specified name for the cache parameter group.
@@ -48,7 +49,7 @@ options:
     required: true
   values:
     description:
-      - A user-specified list of parameters to reset or modify for the cache parameter group.
+      - A user-specified dictionary of parameters to reset or modify for the cache parameter group.
     required: no
     default: None
 """
@@ -70,8 +71,8 @@ EXAMPLES = """
       elasticache_parameter_group:
         name: 'test-param-group'
         values:
-          - ['activerehashing', 'yes']
-          - ['client-output-buffer-limit-normal-hard-limit', 4]
+          activerehashing: yes
+          client-output-buffer-limit-normal-hard-limit: 4
         state: 'present'
     - name: 'Reset all modifiable parameters for the test parameter group'
       elasticache_parameter_group:
@@ -123,25 +124,28 @@ try:
 except ImportError:
     HAS_BOTO3 = False
 
+
 def create(module, conn, name, group_family, description):
     """ Create ElastiCache parameter group. """
     try:
         response = conn.create_cache_parameter_group(CacheParameterGroupName=name, CacheParameterGroupFamily=group_family, Description=description)
         changed = True
-    except boto.exception.BotoServerError as e:
-        module.fail_json(msg="Unable to create cache parameter group.", exception=traceback.format_exc())
+    except botocore.exceptions.ClientError as e:
+        module.fail_json(msg="Unable to create cache parameter group.", exception=traceback.format_exc(), **camel_dict_to_snake_dict(e.response))
     return response, changed
 
+
 def delete(module, conn, name):
     """ Delete ElastiCache parameter group. """
     try:
         conn.delete_cache_parameter_group(CacheParameterGroupName=name)
         response = {}
         changed = True
-    except boto.exception.BotoServerError as e:
-        module.fail_json(msg="Unable to delete cache parameter group.", exception=traceback.format_exc())
+    except botocore.exceptions.ClientError as e:
+        module.fail_json(msg="Unable to delete cache parameter group.", exception=traceback.format_exc(), **camel_dict_to_snake_dict(e.response))
     return response, changed
 
+
 def make_current_modifiable_param_dict(module, conn, name):
     """ Gets the current state of the cache parameter group and creates a dict with the format: {ParameterName: [Allowed_Values, DataType, ParameterValue]}"""
     current_info = get_info(conn, name)
@@ -156,6 +160,7 @@ def make_current_modifiable_param_dict(module, conn, name):
             modifiable_params[param["ParameterName"]] = [param["AllowedValues"], param["DataType"], param["ParameterValue"]]
     return modifiable_params
 
+
 def check_valid_modification(module, values, modifiable_params):
     """ Check if the parameters and values in values are valid.  """
     changed_with_update = False
@@ -184,6 +189,7 @@ def check_valid_modification(module, values, modifiable_params):
 
     return changed_with_update
 
+
 def check_changed_parameter_values(values, old_parameters, new_parameters):
     """ Checking if the new values are different than the old values.  """
     changed_with_update = False
@@ -203,6 +209,7 @@ def check_changed_parameter_values(values, old_parameters, new_parameters):
 
     return changed_with_update
 
+
 def modify(module, conn, name, values):
     """ Modify ElastiCache parameter group to reflect the new information if it differs from the current. """
     # compares current group parameters with the parameters we've specified to to a value to see if this will change the group
@@ -212,10 +219,11 @@ def modify(module, conn, name, values):
         format_parameters.append({'ParameterName': key, 'ParameterValue': value})
     try:
         response = conn.modify_cache_parameter_group(CacheParameterGroupName=name, ParameterNameValues=format_parameters)
-    except boto.exception.BotoServerError as e:
-        module.fail_json(msg="Unable to modify cache parameter group.", exception=traceback.format_exc())
+    except botocore.exceptions.ClientError as e:
+        module.fail_json(msg="Unable to modify cache parameter group.", exception=traceback.format_exc(), **camel_dict_to_snake_dict(e.response))
     return response
 
+
 def reset(module, conn, name, values):
     """ Reset ElastiCache parameter group if the current information is different from the new information. """
     # used to compare with the reset parameters' dict to see if there have been changes
@@ -235,8 +243,8 @@ def reset(module, conn, name, values):
 
     try:
         response = conn.reset_cache_parameter_group(CacheParameterGroupName=name, ParameterNameValues=format_parameters, ResetAllParameters=all_parameters)
-    except boto.exception.BotoServerError as e:
-        module.fail_json(msg="Unable to reset cache parameter group.", exception=traceback.format_exc())
+    except botocore.exceptions.ClientError as e:
+        module.fail_json(msg="Unable to reset cache parameter group.", exception=traceback.format_exc(), **camel_dict_to_snake_dict(e.response))
 
     # determine changed
     new_parameters_dict = make_current_modifiable_param_dict(module, conn, name)
@@ -244,6 +252,7 @@ def reset(module, conn, name, values):
 
     return response, changed
 
+
 def get_info(conn, name):
     """ Gets info about the ElastiCache parameter group. Returns false if it doesn't exist or we don't have access. """
     try:
@@ -287,7 +296,7 @@ def main():
     exists = get_info(connection, parameter_group_name)
 
     # check that the needed requirements are available
-    if state == 'present' and not exists and not (parameter_group_family or group_description):
+    if state == 'present' and not (exists and parameter_group_family and group_description):
         module.fail_json(msg="Creating a group requires a family group and a description.")
     elif state == 'reset' and not exists:
         module.fail_json(msg="No group %s to reset. Please create the group before using the state 'reset'." % parameter_group_name)

test/sanity/pep8/legacy-files.txt

@@ -189,7 +189,6 @@ lib/ansible/modules/cloud/amazon/ecs_taskdefinition.py
 lib/ansible/modules/cloud/amazon/efs.py
 lib/ansible/modules/cloud/amazon/efs_facts.py
 lib/ansible/modules/cloud/amazon/elasticache.py
-lib/ansible/modules/cloud/amazon/elasticache_parameter_group.py
 lib/ansible/modules/cloud/amazon/elasticache_snapshot.py
 lib/ansible/modules/cloud/amazon/elasticache_subnet_group.py
 lib/ansible/modules/cloud/amazon/execute_lambda.py