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

plugins/modules/database/misc/redis_data_info.py

@@ -0,0 +1,111 @@
+#!/usr/bin/python
+# -*- 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
+
+DOCUMENTATION = '''
+---
+module: redis_data_info
+short_description: Get value of key in Redis database
+version_added: 3.7.0
+description:
+  - Get value of keys in Redis database.
+author: "Andreas Botzner (@paginabianca)"
+options:
+  key:
+    description:
+      - Database key.
+    type: str
+    required: true
+
+extends_documentation_fragment:
+  - community.general.redis
+
+seealso:
+  - module: community.general.redis_info
+  - module: community.general.redis
+'''
+
+EXAMPLES = '''
+- name: Get key foo=bar from loalhost with no username
+  community.general.redis_data_info:
+    login_host: localhost
+    login_password: supersecret
+    key: foo
+
+- name: Get key foo=bar on redishost with custom ca-cert file
+  community.general.redis_data_info:
+    login_host: redishost
+    login_password: supersecret
+    login_user: somuser
+    validate_certs: true
+    ssl_ca_certs: /path/to/ca/certs
+    key: foo
+'''
+
+RETURN = '''
+exists:
+  description: If they key exists in the database.
+  returned: on success
+  type: bool
+value:
+  description: Value key was set to.
+  returned: if existing
+  type: str
+  sample: 'value_of_some_key'
+msg:
+  description: A short message.
+  returned: always
+  type: str
+  sample: 'Got key: foo with value: bar'
+'''
+
+from ansible.module_utils.basic import AnsibleModule
+from ansible_collections.community.general.plugins.module_utils.redis import (
+    fail_imports, redis_auth_argument_spec, RedisAnsible)
+
+
+def main():
+    redis_auth_args = redis_auth_argument_spec()
+    module_args = dict(
+        key=dict(type='str', required=True, no_log=False),
+    )
+    module_args.update(redis_auth_args)
+
+    module = AnsibleModule(
+        argument_spec=module_args,
+        supports_check_mode=True,
+    )
+    fail_imports(module)
+
+    redis = RedisAnsible(module)
+
+    key = module.params['key']
+    result = {'changed': False}
+
+    value = None
+    try:
+        value = redis.connection.get(key)
+    except Exception as e:
+        msg = 'Failed to get value of key "{0}" with exception: {1}'.format(
+            key, str(e))
+        result['msg'] = msg
+        module.fail_json(**result)
+
+    if value is None:
+        msg = 'Key "{0}" does not exist in database'.format(key)
+        result['exists'] = False
+    else:
+        msg = 'Got key "{0}"'.format(key)
+        result['value'] = value
+        result['exists'] = True
+    result['msg'] = msg
+    module.exit_json(**result)
+
+
+if __name__ == '__main__':
+    main()