[cloud] New module ec2_vpc_igw_facts (#19787)

* added ec2_vpc_igw_facts module

* added cr at end of file

* corrected import json in wrong location

* corrected version added

* added snake_case conversion

* updated documentation and fixed for python 3'

* ec2_vpc_igw_facts: simplify logic

Make module arguments more 'Ansiblish'
Remove unnecessary intermediate variables in results generation
Use `ansible_dict_to_boto3_filter_list` rather than duplicating logic
Use `check_mode` rather than pass a `dryrun` argument
Update for flake8 improvements

* updated documentation

lib/ansible/modules/cloud/amazon/ec2_vpc_igw_facts.py

@@ -0,0 +1,164 @@
+#!/usr/bin/python
+#
+# This is a free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This Ansible library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+# import module snippets
+from ansible.module_utils.basic import AnsibleModule
+from ansible.module_utils.ec2 import ec2_argument_spec, get_aws_connection_info
+from ansible.module_utils.ec2 import boto3_conn, camel_dict_to_snake_dict
+from ansible.module_utils.ec2 import ansible_dict_to_boto3_filter_list, HAS_BOTO3
+
+
+DOCUMENTATION = '''
+---
+module: ec2_vpc_igw_facts
+short_description: Gather facts about internet gateways in AWS
+description:
+    - Gather facts about internet gateways in AWS.
+version_added: "2.3"
+author: "Nick Aslanidis (@naslanidis)"
+options:
+  filters:
+    description:
+      - A dict of filters to apply. Each dict item consists of a filter key and a filter value.
+        See U(http://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeRouteTables.html) for possible filters.
+    required: false
+    default: null
+  internet_gateway_ids:
+    description:
+      - Get details of specific Internet Gateway ID. Provide this value as a list.
+    required: false
+    default: None
+extends_documentation_fragment:
+    - aws
+    - ec2
+'''
+
+EXAMPLES = '''
+# # Note: These examples do not set authentication details, see the AWS Guide for details.
+
+- name: Gather facts about all Internet Gateways for an account or profile
+  ec2_vpc_igw_facts:
+    region: ap-southeast-2
+    profile: production
+  register: igw_facts
+
+- name: Gather facts about a filtered list of Internet Gateways
+  ec2_vpc_igw_facts:
+    region: ap-southeast-2
+    profile: production
+    filters:
+        "tag:Name": "igw-123"
+  register: igw_facts
+
+- name: Gather facts about a specific internet gateway by InternetGatewayId
+  ec2_vpc_igw_facts:
+    region: ap-southeast-2
+    profile: production
+    internet_gateway_ids: igw-c1231234
+  register: igw_facts
+'''
+
+RETURN = '''
+internet_gateways:
+    description: The internet gateways for the account.
+    returned: always
+    type: list
+    sample: [
+        {
+            "attachments": [
+                {
+                    "state": "available",
+                    "vpc_id": "vpc-02123b67"
+                }
+            ],
+            "internet_gateway_id": "igw-2123634d",
+            "tags": [
+                {
+                    "key": "Name",
+                    "value": "test-vpc-20-igw"
+                }
+            ]
+        }
+    ]
+
+changed:
+    description: True if listing the internet gateways succeeds.
+    type: bool
+    returned: always
+    sample: "false"
+'''
+
+try:
+    import botocore
+except ImportError:
+    pass  # will be captured by imported HAS_BOTO3
+
+
+def get_internet_gateway_info(internet_gateway):
+    internet_gateway_info = {'InternetGatewayId': internet_gateway['InternetGatewayId'],
+                             'Attachments': internet_gateway['Attachments'],
+                             'Tags': internet_gateway['Tags'] }
+    return internet_gateway_info
+
+
+def list_internet_gateways(client, module):
+    params = dict()
+
+    params['Filters'] = ansible_dict_to_boto3_filter_list(module.params.get('filters'))
+    params['DryRun'] = module.check_mode
+
+    if module.params.get("internet_gateway_ids"):
+        params['InternetGatewayIds'] = module.params.get("internet_gateway_ids")
+
+    try:
+        all_internet_gateways = client.describe_internet_gateways(**params)
+    except botocore.exceptions.ClientError as e:
+        module.fail_json(msg=str(e))
+
+    snaked_internet_gateways = [camel_dict_to_snake_dict(get_internet_gateway_info(igw))
+                                for igw in all_internet_gateways['InternetGateways']]
+
+    module.exit_json(internet_gateways=snaked_internet_gateways)
+
+
+def main():
+    argument_spec = ec2_argument_spec()
+    argument_spec.update(
+        dict(
+            filters = dict(type='dict', default=dict()),
+            internet_gateway_ids = dict(type='list', default=None)
+        )
+    )
+
+    module = AnsibleModule(argument_spec=argument_spec, supports_check_mode=True)
+
+    # Validate Requirements
+    if not HAS_BOTO3:
+        module.fail_json(msg='botocore and boto3 are required.')
+
+    try:
+        region, ec2_url, aws_connect_kwargs = get_aws_connection_info(module, boto3=True)
+        connection = boto3_conn(module, conn_type='client', resource='ec2', region=region, endpoint=ec2_url, **aws_connect_kwargs)
+    except botocore.exceptions.NoCredentialsError as e:
+        module.fail_json(msg="Can't authorize connection - " + str(e))
+
+    # call your function here
+    results = list_internet_gateways(connection, module)
+
+    module.exit_json(result=results)
+
+
+if __name__ == '__main__':
+    main()