New module mysql_info - Gather information about MySQL servers (#55434)

* New module mysql_info: collect info about MySQL server instance

* mysql_info - CI tests

* mysql_info: fixes

* mysql_info: fixes Decimal

* mysql_info: fixes Decimal converters.py

* mysql_info: fixed err conn message and check_mode

* mysql_info: added decimal.Decimal to lib/ansible/parsing/ajson.py

* mysql_info: convert Decimal to float

* mysql_info: fix

* mysql_info: fix

* mysql_info: returned the args list as it was

* mysql_info: fix typo

* mysql_info: fixes

* mysql_info: removed aliases for login_db

* mysql_info: changed RETURN condition info

* mysql_info: fixed doc

* mysql_info: fixed role's parsing

* mysql_info: fixed role's parsing

* mysql_info: fixes

* mysql_info: fixed integration tests

test/integration/targets/mysql_info/aliases

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+destructive
+shippable/posix/group1
+skip/osx
+skip/freebsd

test/integration/targets/mysql_info/defaults/main.yml

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+---
+# defaults file for test_mysql_info
+db_name: data
+user_name: alice
+user_pass: alice

test/integration/targets/mysql_info/meta/main.yml

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+dependencies:
+  - setup_mysql_db
+  - setup_remote_tmp_dir

test/integration/targets/mysql_info/tasks/main.yml

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+# Test code for mysql_info module
+# Copyright: (c) 2019, Andrew Klychkov (@Andersson007) <aaklychkov@mail.ru>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+###################
+# Prepare for tests
+#
+
+# Create role for tests
+- name: mysql_info -  create mysql user {{ user_name }}
+  mysql_user:
+    name: '{{ user_name }}'
+    password: '{{ user_pass }}'
+    state: present
+    priv: '*.*:ALL'
+    login_unix_socket: '{{ mysql_socket }}'
+
+# Create default MySQL config file with credentials
+- name: mysql_info - create default config file
+  template:
+    src: my.cnf.j2
+    dest: '/root/.my.cnf'
+    mode: 0400
+
+# Create non-default MySQL config file with credentials
+- name: mysql_info - create non-default config file
+  template:
+    src: my.cnf.j2
+    dest: '/root/non-default_my.cnf'
+    mode: 0400
+
+###############
+# Do tests
+
+# Access by default cred file
+- name: mysql_info - collect default cred file
+  mysql_info:
+    login_user: '{{ user_name }}'
+  register: result
+
+- assert:
+    that:
+    - result.changed == false
+    - result.version != {}
+    - result.settings != {}
+    - result.databases != {}
+    - result.engines != {}
+    - result.users != {}
+
+# Access by non-default cred file
+- name: mysql_info - check non-default cred file
+  mysql_info:
+    login_user: '{{ user_name }}'
+    config_file: '/root/non-default_my.cnf'
+  register: result
+
+- assert:
+    that:
+    - result.changed == false
+    - result.version != {}
+
+# Remove cred files
+- name: mysql_info - remove cred files
+  file:
+    path: '{{ item }}'
+    state: absent
+  with_items:
+  - '/root/.my.cnf'
+  - '/root/non-default_my.cnf'
+
+# Access with password
+- name: mysql_info - check access with password
+  mysql_info:
+    login_user: '{{ user_name }}'
+    login_password: '{{ user_pass }}'
+  register: result
+
+- assert:
+    that:
+    - result.changed == false
+    - result.version != {}
+
+# Test excluding
+- name: Collect all info except settings and users
+  mysql_info:
+    login_user: '{{ user_name }}'
+    login_password: '{{ user_pass }}'
+    filter: "!settings,!users"
+  register: result
+
+- assert:
+    that:
+    - result.changed == false
+    - result.version != {}
+    - result.databases != {}
+    - result.engines != {}
+    - result.settings is not defined
+    - result.users is not defined
+
+# Test including
+- name: Collect info only about version and databases
+  mysql_info:
+    login_user: '{{ user_name }}'
+    login_password: '{{ user_pass }}'
+    filter:
+    - version
+    - databases
+  register: result
+
+- assert:
+    that:
+    - result.changed == false
+    - result.version != {}
+    - result.databases != {}
+    - result.engines is not defined
+    - result.settings is not defined
+    - result.users is not defined

test/integration/targets/mysql_info/templates/my.cnf.j2

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+[client]
+user={{ user_name }}
+password={{ user_pass }}