feat(redis): add ansible role

roles/redis/README.md

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+# `finallycoffee.databases.redis` ansible role
+
+Redis is the self-proclaimed world's fastest data platform for caching,
+vector search and NoSQL databases. Since version 7.2.4, it is no longer
+considered "Free and open source software" (FOSS), with redis switching
+their license to the "Serverside public license" (SSPL).
+
+Setting the `redis_version` to higher than `7.2.4` means you will deploy
+the SSPL-licensed version to redis.
+
+## Configuration
+
+All container-related options to the `docker_container` ansible module
+are available under the `redis_container_*` namespace, for example use
+`redis_container_ports: [ '127.0.0.1:6379:6370/tcp' ]` to map the
+containers port 6379 to the docker host.
+
+Redis-related config options are either available in the `redis_config_*`
+namespace or can be specified by setting them as a dictionary in
+`redis_config`
+
+### Authentication and authorization
+
+Redis ACL can be specified as an array in the `redis_config_user` variable
+ - see [the redis documentation](https://github.com/redis/redis/blob/unstable/redis.conf#L869)
+for the format. Per default, the `default` user is able to connect without
+any password. To require a password and use a different user, override
+the variable, for example `redis_config_user: [ 'username on +@all -DEBUG ~* >secret' ]`.
+
+## Redis on a unix socket
+
+To make redis available on a unix socket, a directory must be supplied in which the
+socket lives:
+```yaml
+redis_container_socket: /var/run/redis.sock
+redis_container_volumes:
+  - "/path/to/socket/on/host/redis.sock:{{ redis_container_socket }}:z"
+redis_config_unixsocket: "{{ redis_container_socket }}"
+```
+
+## Container specific information
+
+Redis publishes their official container image in both a debian-based and an
+alpine-based variant. Which image should be used can be configured in
+`redis_container_image_flavour`, which defaults to `alpine`, which is smaller
+in size but also includes less related / debugging tools. To use the debian-
+based image, unset the flavour using `redis_container_image_flavour: ~`.

roles/redis/defaults/main/config.yml

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+---
+redis_config_bind:
+  - "127.0.0.1"
+  - "-::1"
+redis_config_protected_mode: true
+redis_config_port: 6379
+redis_config_unixsocket: ~
+redis_config_unixsocketperm: '700'
+redis_config_user:
+  - "default on +@all -DEBUG ~* nopass"
+redis_config_databases: 16
+redis_config_supervised: false
+redis_config_daemonize: false
+redis_config_dbfilename: dump.rdb
+redis_config_dir: "{{ redis_data_path }}"
+redis_config_save: "3600 1 300 100 60 10000"
+redis_config_appendfsync: everysec
+
+redis_base_config:
+  bind: "{{ redis_config_bind | join(' ') }}"
+  "protected-mode": "{{ redis_config_protected_mode | bool | ternary('yes', 'no') }}"
+  port: "{{ redis_config_port }}"
+  user: "{{ redis_config_user }}"
+  databases: "{{ redis_config_databases }}"
+  daemonize: "{{ redis_config_daemonize | bool | ternary('yes', 'no') }}"
+  supervised: "{{ redis_config_supervised | bool | ternary('yes', 'no') }}"
+  save: "{{ redis_config_save }}"
+  dbfilename: "{{ redis_config_dbfilename }}"
+  dir: "{{ redis_config_dir }}"
+  appendfsync: "{{ redis_config_appendfsync }}"
+
+redis_config: ~
+redis_merged_config: >-2
+  {{ redis_base_config
+  | combine(({
+      'unixsocket': redis_config_unixsocket,
+      'unixsocketperm': redis_config_unixsocketperm,
+    })
+    if (redis_config_unixsocket | default(false, true)) else {},
+    recursive=True)
+  | combine(redis_config | default({}, true), recursive=True) }}

roles/redis/defaults/main/container.yml

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+---
+redis_container_image_registry: docker.io
+redis_container_image_namespace: ~
+redis_container_image_name: redis
+redis_container_image_tag: ~
+redis_container_image_flavour: alpine
+redis_container_image_source: pull
+redis_container_image_force_source: >-2
+  {{ redis_container_image_tag | default(false, true) | bool }}
+redis_container_image: >-2
+  {{
+    ([
+      redis_container_image_registry | default([], true),
+      redis_container_image_namespace | default([], true),
+      redis_container_image_name,
+    ] | flatten | join('/'))
+    + ':' +
+    (redis_container_image_tag | default(
+      redis_version + (
+        ((redis_container_image_flavour is string)
+            and (redis_container_image_flavour | length > 0))
+        | ternary('-' + (redis_container_image_flavour | default('')), '')
+      ),
+      true,
+    ))
+  }}
+
+redis_container_name: "redis{{ redis_instance_suffix }}"
+redis_container_env: ~
+redis_container_user: >-2
+  {{ redis_run_user_id }}:{{ redis_run_group_id }}
+redis_container_ports: ~
+redis_container_labels: ~
+redis_container_volumes: ~
+redis_container_merged_volumes: >-2
+  {{ redis_container_base_volumes
+  + redis_container_volumes | default([], true) }}
+redis_container_command:
+  - "redis-server"
+  - "{{ redis_config_file }}"
+redis_container_networks: ~
+redis_container_etc_hosts: ~
+redis_container_dns_servers: ~
+redis_container_restart_policy: "unless-stopped"
+redis_container_state: >-2
+  {{ (redis_state == 'present') | ternary('started', 'absent') }}
+redis_container_base_volumes:
+  - "{{ redis_config_file }}:{{ redis_config_file }}:ro"
+  - "{{ redis_data_path }}:{{ redis_data_path }}:rw"

roles/redis/defaults/main/main.yml

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+---
+redis_version: "7.2.4"
+redis_state: "present"
+redis_instance: ~
+redis_instance_suffix: >-2
+  {{ ((redis_instance is string) and (redis_instance | length > 0))
+    | ternary('-' + (redis_instance | default('', true)), '') }}
+redis_user: >-2
+  redis{{ redis_instance_suffix }}
+
+redis_config_path: "/etc/redis"
+redis_config_file: >-2
+  {{ redis_config_path }}/redis{{ redis_instance_suffix }}.conf
+redis_data_path: "/var/lib/redis{{ redis_instance_suffix }}"
+redis_deployment_method: docker

roles/redis/defaults/main/user.yml

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+---
+redis_run_user_id: >-2
+  {{ redis_user_info.uid | default(redis_user, true) }}
+redis_run_group_id: >-2
+  {{ redis_user_info.group | default(redis_user, true) }}
+redis_user_system: true
+redis_user_create_home: false
+redis_user_groups: ~
+redis_user_append_groups: >-2
+  {{ redis_user_groups | default(true, false) | bool }}

roles/redis/handlers/main.yml

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+---
+- name: Ensure redis container '{{ redis_container_name }}' is restarted
+  community.docker.docker_container:
+    name: "{{ redis_container_name }}"
+    state: "{{ redis_container_state }}"
+    restart: true
+  listen: redis-restart
+  when:
+    - redis_deployment_method == 'docker'
+    - redis_state == 'present'
+  ignore_errors: "{{ ansible_check_mode }}"

roles/redis/meta/main.yml

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+---
+allow_duplicates: true
+dependencies: []
+galaxy_info:
+  role_name: redis
+  description: >-2
+    Deploy and configure redis, a fast caching, vector-search and NoSQL database.
+  galaxy_tags:
+    - redis
+    - docker

roles/redis/tasks/deploy-docker.yml

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+---
+- name: Ensure container image '{{ redis_container_image }}' is {{ redis_state }}
+  community.docker.docker_image:
+    name: "{{ redis_container_image }}"
+    state: "{{ redis_state }}"
+    source: "{{ redis_container_image_source }}"
+    force_source: "{{ redis_container_image_force_source }}"
+  register: redis_container_image_info
+  until: redis_container_image_info is success
+  retries: 5
+  delay: 3
+
+- name: Ensure container '{{ redis_container_name }}' is {{ redis_container_state }}
+  community.docker.docker_container:
+    name: "{{ redis_container_name }}"
+    image: "{{ redis_container_image }}"
+    env: "{{ redis_container_env | default(omit, true) }}"
+    user: "{{ redis_container_user }}"
+    ports: "{{ redis_container_ports | default(omit, true) }}"
+    labels: "{{ redis_container_labels | default(omit, true) }}"
+    command: "{{ redis_container_command }}"
+    volumes: "{{ redis_container_merged_volumes }}"
+    networks: "{{ redis_container_networks | default(omit, true) }}"
+    etc_hosts: "{{ redis_container_etc_hosts | default(omit, true) }}"
+    dns_servers: "{{ redis_container_dns_servers | default(omit, true) }}"
+    state: "{{ redis_container_state }}"

roles/redis/tasks/main.yml

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+---
+- name: Ensure state is valid
+  ansible.builtin.fail:
+    msg: >-2
+      Unsupported state '{{ redis_state }}'.
+      Supported states are {{ redis_states | join(', ') }}
+  when: redis_state not in redis_states
+
+- name: Ensure deployment method is valid
+  ansible.builtin.fail:
+    msg: >-2
+      Unsupported deployment method '{{ redis_deployment_method }}'!
+      Supported methods are {{ redis_deployment_method | join(', ') }}
+  when: redis_deployment_method not in redis_deployment_methods
+
+- name: Ensure redis user '{{ redis_user }}' is {{ redis_state }}
+  ansible.builtin.user:
+    name: "{{ redis_user }}"
+    state: "{{ redis_state }}"
+    system: "{{ redis_user_system }}"
+    create_home: "{{ redis_user_create_home }}"
+    groups: "{{ redis_user_groups | default(omit, true) }}"
+    append: "{{ redis_user_append_groups | default(omit, true) }}"
+  register: redis_user_info
+
+- name: Ensure redis config file '{{ redis_config_file }}' is {{ redis_state }}
+  ansible.builtin.file:
+    path: "{{ redis_config_file }}"
+    state: "{{ redis_state }}"
+  when: redis_state == 'absent'
+
+- name: Ensure redis host directories are {{ redis_state }}
+  ansible.builtin.file:
+    path: "{{ path.name }}"
+    state: >-2
+      {{ (redis_state == 'present') | ternary('directory', 'absent') }}
+    owner: "{{ path.owner | default(redis_run_user_id) }}"
+    group: "{{ path.group | default(redis_run_group_id) }}"
+    mode: "{{ path.mode | default('0755') }}"
+  loop:
+    - name: "{{ redis_config_path }}"
+    - name: "{{ redis_data_path }}"
+  loop_control:
+    loop_var: "path"
+    label: "{{ path.name }}"
+
+- name: Ensure redis config file '{{ redis_config_file }}' is {{ redis_state }}
+  ansible.builtin.copy:
+    content: |+2
+      {% for tuple in (redis_merged_config | dict2items) %}
+      {% if tuple.value is string  or tuple.value is number %}
+      {{ tuple.key }} {{ tuple.value }}
+      {% else %}
+      {% for value in tuple.value %}
+      {{ tuple.key }} {{ value }}
+      {% endfor %}
+      {% endif %}
+      {% endfor %}
+    dest: "{{ redis_config_file }}"
+    owner: "{{ redis_run_user_id }}"
+    group: "{{ redis_run_group_id }}"
+    mode: "0640"
+  when: redis_state == 'present'
+  notify: redis-restart
+
+- name: Deploy redis using {{ redis_deployment_method }}
+  ansible.builtin.include_tasks:
+    file: "deploy-{{ redis_deployment_method }}.yml"

roles/redis/vars/main.yml

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+---
+redis_states:
+  - present
+  - absent
+redis_deployment_methods:
+  - docker