---
# Chaos Engineering для тестирования отказоустойчивости
# Автор: Сергей Антропов
# Сайт: https://devops.org.ru

- name: Chaos Network (add latency)
  hosts: localhost
  gather_facts: false
  vars:
    chaos_duration: "{{ chaos_duration | default(60) }}"
    chaos_latency: "{{ chaos_latency | default('100ms') }}"
    chaos_loss: "{{ chaos_loss | default('5%') }}"

  tasks:
    - name: Install chaos tools
      package:
        name: [iproute2, iptables, tc]
        state: present

    - name: Add network latency
      command: >
        tc qdisc add dev eth0 root netem delay {{ chaos_latency }}
      ignore_errors: true

    - name: Add packet loss
      command: >
        tc qdisc add dev eth0 root netem loss {{ chaos_loss }}
      ignore_errors: true

    - name: Wait for chaos duration
      pause:
        seconds: "{{ chaos_duration }}"

    - name: Remove network chaos
      command: >
        tc qdisc del dev eth0 root
      ignore_errors: true

- name: Chaos Services (random failures)
  hosts: all
  become: true
  vars:
    chaos_services:
      - postgresql
      - redis
      - nginx
      - docker

  tasks:
    - name: Random service stop
      systemd:
        name: "{{ item }}"
        state: stopped
      loop: "{{ chaos_services }}"
      when: (ansible_play_hosts.index(inventory_hostname) + ansible_date_time.epoch) % 3 == 0

    - name: Wait for chaos
      pause:
        seconds: 30

    - name: Restart services
      systemd:
        name: "{{ item }}"
        state: started
      loop: "{{ chaos_services }}"
      when: (ansible_play_hosts.index(inventory_hostname) + ansible_date_time.epoch) % 3 == 0

- name: Chaos Docker (container failures)
  hosts: "{{ groups['dind'] | default([]) }}"
  gather_facts: false
  vars:
    docker_host: "tcp://{{ inventory_hostname }}:2375"

  tasks:
    - name: Random container stop
      community.docker.docker_container:
        name: "{{ item }}"
        state: stopped
        docker_host: "{{ docker_host }}"
      loop: "{{ ansible_play_hosts }}"
      when: (ansible_play_hosts.index(inventory_hostname) + ansible_date_time.epoch) % 4 == 0

    - name: Wait for chaos
      pause:
        seconds: 20

    - name: Restart containers
      community.docker.docker_container:
        name: "{{ item }}"
        state: started
        docker_host: "{{ docker_host }}"
      loop: "{{ ansible_play_hosts }}"
      when: (ansible_play_hosts.index(inventory_hostname) + ansible_date_time.epoch) % 4 == 0