New Docker Stack Task Info Module with Tests (#732)

* Add docker_stack_task_info with tests

* Change link

* Change ln

* Fix Documentation

* Small doc changes

* Remove node for RH

plugins/modules/cloud/docker/docker_stack_task_info.py

@@ -0,0 +1,95 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2020 Jose Angel Munoz (@imjoseangel)
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import (absolute_import, division, print_function)
+
+__metaclass__ = type
+
+DOCUMENTATION = '''
+---
+module: docker_stack_task_info
+author: "Jose Angel Munoz (@imjoseangel)"
+short_description: Return information of the tasks on a docker stack
+description:
+  - Retrieve information on docker stacks tasks using the C(docker stack) command
+    on the target node (see examples).
+options:
+  name:
+    description:
+      - Stack name.
+    type: str
+    required: yes
+version_added: "1.1.0"
+'''
+
+RETURN = '''
+results:
+    description: |
+        List of dictionaries containing the list of tasks associated
+        to a stack name.
+    sample: >
+        [{"CurrentState":"Running","DesiredState":"Running","Error":"","ID":"7wqv6m02ugkw","Image":"busybox","Name":"test_stack.1","Node":"swarm","Ports":""}]
+    returned: always
+    type: list
+    elements: dict
+'''
+
+EXAMPLES = '''
+  - name: Shows stack info
+    community.general.docker_stack_task_info:
+      name: test_stack
+    register: result
+
+  - name: Show results
+    ansible.builtin.debug:
+      var: result.results
+'''
+
+import json
+from ansible.module_utils.basic import AnsibleModule
+
+
+def docker_stack_task(module, stack_name):
+    docker_bin = module.get_bin_path('docker', required=True)
+    rc, out, err = module.run_command(
+        [docker_bin, "stack", "ps", stack_name, "--format={{json .}}"])
+
+    return rc, out.strip(), err.strip()
+
+
+def main():
+    module = AnsibleModule(
+        argument_spec={
+            'name': dict(type='str', required=True)
+        },
+        supports_check_mode=False
+    )
+
+    name = module.params['name']
+
+    rc, out, err = docker_stack_task(module, name)
+
+    if rc != 0:
+        module.fail_json(msg="Error running docker stack. {0}".format(err),
+                         rc=rc, stdout=out, stderr=err)
+    else:
+        if out:
+            ret = list(
+                json.loads(outitem)
+                for outitem in out.splitlines())
+
+        else:
+            ret = []
+
+        module.exit_json(changed=False,
+                         rc=rc,
+                         stdout=out,
+                         stderr=err,
+                         results=ret)
+
+
+if __name__ == "__main__":
+    main()