def cnf(action,configs,path):
    message = "Modify %s\n" %path
    changed = False
    if action == "get":
        with open(path,"r") as f:
            message = f.read()
        return changed,message
    if not os.path.exists(path):
        message += "%s do not exist, create it\n" %path
    cnf = Mycnf(path)
    if action == "update":
        changed,msg = cnf.set_all(configs)
        message += msg
    elif action == "delete":
        changed, msg = cnf.delete_all(configs)
        message += msg
    else:
        message = "Invalid action"
    return changed,message

def main():
    module = AnsibleModule(
        argument_spec=dict(
            type=dict(default="cnf"),
            action=dict(default="update"),
            configs=dict(),
            path=dict(default="/etc/my.cnf"),
        ),
        supports_check_mode=True
    )

    type = module.params["type"]
    action = module.params["action"]
    configs = module.params["configs"]
    path = module.params["path"]

    if type not in TYPE:
        module.fail_json(msg="Invalid type %s,must be in %s" %(type,str(TYPE)))
    if action not in ACTION:
        module.fail_json(msg="Invalid action %s,must be in %s" %(action,str(ACTION)))
    try:
        configs = json.loads(configs)
    except:
        module.fail_json(msg="configs must be a json type")
    if action == "get" and not os.path.exists(path):
        module.fail_json(msg="%s do not exist" %path)
    try:
        cmd = globals()[type]
        changed, msg = cmd(action,configs,path)
        module.exit_json(changed=changed, stdout=msg)
    except Exception as e:
        module.fail_json(msg=e.message)

from ansible.module_utils.basic import *

if __name__ == ‘__main__‘:
    main()

======================================================================
- hosts: localhost
  tasks:
  
  - name: test my module
    config_file: 
      type: cnf
      action: delete
      configs: ‘{"mysqld":{"mhc":"2b"}}‘
      path: /root/test/ansible_test/mhc_test/my.cnf
    register: mhc
  
  - debug: var=mhc

    

Ansible develop module