Adds redis_data_info module (#3227)

* Added redis_data_info module

Added:
  - redis_data_info module and suggested 'exists' return flag.
  - module_utils for redis with a base class that handles database connections.
  - inhereited unit tests and added some new ones for the exit flag

* Docfix and sanity

* typo

* Suggested doc changes and ssl option

* TLS and validate_certs fix

* Set support_check_mode for info plugin

* Docfix and import errors

* Redis versioning Fix

* version bump and append fixes

tests/unit/plugins/modules/database/misc/test_redis_data_info.py

@@ -0,0 +1,113 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright: (c) 2021, Andreas Botzner <andreas at botzner dot com>
+# 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
+
+
+import pytest
+import json
+from redis import __version__
+
+from ansible_collections.community.general.plugins.modules.database.misc import (
+    redis_data_info)
+from ansible_collections.community.general.tests.unit.plugins.modules.utils import set_module_args
+
+
+HAS_REDIS_USERNAME_OPTION = True
+if tuple(map(int, __version__.split('.'))) < (3, 4, 0):
+    HAS_REDIS_USERNAME_OPTION = False
+
+
+def test_redis_data_info_without_arguments(capfd):
+    set_module_args({})
+    with pytest.raises(SystemExit):
+        redis_data_info.main()
+    out, err = capfd.readouterr()
+    assert not err
+    assert json.loads(out)['failed']
+
+
+@pytest.mark.skipif(not HAS_REDIS_USERNAME_OPTION, reason="Redis version < 3.4.0")
+def test_redis_data_info_existing_key(capfd, mocker):
+    set_module_args({'login_host': 'localhost',
+                     'login_user': 'root',
+                     'login_password': 'secret',
+                     'key': 'foo',
+                     '_ansible_check_mode': False})
+    mocker.patch('redis.Redis.get', return_value='bar')
+    with pytest.raises(SystemExit):
+        redis_data_info.main()
+    out, err = capfd.readouterr()
+    print(out)
+    assert not err
+    assert json.loads(out)['exists']
+    assert json.loads(out)['value'] == 'bar'
+
+
+@pytest.mark.skipif(not HAS_REDIS_USERNAME_OPTION, reason="Redis version < 3.4.0")
+def test_redis_data_info_absent_key(capfd, mocker):
+    set_module_args({'login_host': 'localhost',
+                     'login_user': 'root',
+                     'login_password': 'secret',
+                     'key': 'foo',
+                     '_ansible_check_mode': False})
+    mocker.patch('redis.Redis.get', return_value=None)
+    with pytest.raises(SystemExit):
+        redis_data_info.main()
+    out, err = capfd.readouterr()
+    print(out)
+    assert not err
+    assert not json.loads(out)['exists']
+    assert 'value' not in json.loads(out)
+
+
+@pytest.mark.skipif(HAS_REDIS_USERNAME_OPTION, reason="Redis version > 3.4.0")
+def test_redis_data_fail_username(capfd, mocker):
+    set_module_args({'login_host': 'localhost',
+                     'login_user': 'root',
+                     'login_password': 'secret',
+                     'key': 'foo',
+                     '_ansible_check_mode': False})
+    with pytest.raises(SystemExit):
+        redis_data_info.main()
+    out, err = capfd.readouterr()
+    print(out)
+    assert not err
+    assert json.loads(out)['failed']
+    assert json.loads(
+        out)['msg'] == 'The option `username` in only supported with redis >= 3.4.0.'
+
+
+@pytest.mark.skipif(HAS_REDIS_USERNAME_OPTION, reason="Redis version > 3.4.0")
+def test_redis_data_info_absent_key_no_username(capfd, mocker):
+    set_module_args({'login_host': 'localhost',
+                     'login_password': 'secret',
+                     'key': 'foo',
+                     '_ansible_check_mode': False})
+    mocker.patch('redis.Redis.get', return_value=None)
+    with pytest.raises(SystemExit):
+        redis_data_info.main()
+    out, err = capfd.readouterr()
+    print(out)
+    assert not err
+    assert not json.loads(out)['exists']
+    assert 'value' not in json.loads(out)
+
+
+@pytest.mark.skipif(HAS_REDIS_USERNAME_OPTION, reason="Redis version > 3.4.0")
+def test_redis_data_info_existing_key_no_username(capfd, mocker):
+    set_module_args({'login_host': 'localhost',
+                     'login_password': 'secret',
+                     'key': 'foo',
+                     '_ansible_check_mode': False})
+    mocker.patch('redis.Redis.get', return_value='bar')
+    with pytest.raises(SystemExit):
+        redis_data_info.main()
+    out, err = capfd.readouterr()
+    print(out)
+    assert not err
+    assert json.loads(out)['exists']
+    assert json.loads(out)['value'] == 'bar'