Using Block in Handler - Ansible

I am writing a handler for an Ansible role to stop and start docker. The stop is written as follows in handlers/main.yml

- name: stop docker
  block:

    - name: stop docker (Debian based)
      block:

        - name: stop service docker on debian, if running
          systemd: name=docker state=stopped

        - name: stop service docker.socket on debian, if running
          systemd: name=docker.socket state=stopped

      when: ansible_pkg_mgr == "apt"
  
    - name: stop docker (CentOS based)
      block:

        - name: stop service docker on CentOS, if running
          service:
            name: docker
            state: stopped

        - name: stop service docker.socket on CentOS, if running
          service:
            name: docker
            state: stopped

      when: ansible_pkg_mgr == "yum"

Then in my tasks/main file, I'm calling stop docker

---
- name: test
  command: echo "Stopping docker" 

  notify:
    - stop docker

The error I'm receiving is ERROR! Unexpected Exception, this is probably a bug: 'Block' object has no attribute 'notified_hosts'

If I run this as a task in a playbook it works.

Is there a way to use block in an Ansible handler?

Solution

According your error message it seems that Ansible do not provide block functionality for handlers.

Instead you could use an other approach

handlers:
  - name: Stop Docker
    include_tasks: tasks/stop_docker.yaml

and put the logic into a separate task file.

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