feat: install and test mCaptcha/cache

ansible/artifacts/cache/cache.service

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+[Unit]
+Description=Redis instance with mCaptcha cache module
+After=network.target
+Documentation=https://github.com/mCaptcha/cache
+
+[Service]
+Type=notify
+ExecStart=/usr/bin/redis-server /etc/redis/redis.conf --supervised systemd --daemonize no
+PIDFile=/run/redis/redis-server.pid
+TimeoutStopSec=0
+Restart=always
+User=redis
+Group=redis
+RuntimeDirectory=redis
+RuntimeDirectoryMode=2755
+
+UMask=007
+PrivateTmp=true

ansible/artifacts/cache/redis.conf

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+loadmodule /usr/lib/redis/modules/libcache.so
+bind 0.0.0.0

ansible/cache.yml

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+# SPDX-FileCopyrightText: 2023 Aravinth Manivannan <realaravinth@batsense.net>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+---
+- name: Base configuration
+  ansible.builtin.import_playbook: base.yml
+
+- name: Install redis cache
+  hosts: mcaptcha_demo_server
+  remote_user: atm
+  pre_tasks:
+    - name: Ensure all VMs are reachable
+      ansible.builtin.ping:
+
+  tasks:
+    - name: Install redis-server
+      become: true
+      ansible.builtin.apt:
+        update_cache: true
+        pkg:
+          - redis-server
+
+    - name: Create Redis plugins dir
+      become: true
+      ansible.builtin.file:
+        path: /usr/lib/redis/modules
+        owner: redis
+        group: redis
+        state: directory
+        mode: "0755"
+
+    - name: Copy custom Redis configuration
+      become: true
+      ansible.builtin.copy:
+        src: ./artifacts/cache/redis.conf
+        dest: /etc/redis/
+        owner: redis
+        group: redis
+        force: true
+        mode: "0640"
+
+    - name: Create download dir
+      ansible.builtin.file:
+        path: /tmp/cache-lib
+        state: directory
+        mode: "0755"
+
+    - name: Download plugin
+      ansible.builtin.get_url:
+        url: https://dl.mcaptcha.org/mcaptcha/cache/master/cache-master-linux-amd64.tar.gz
+        dest: /tmp/cache-lib/
+        checksum: sha256:https://dl.mcaptcha.org/mcaptcha/cache/master/cache-master-linux-amd64.tar.gz.sha256
+
+    - name: Extract cache-master-linux-amd64.tar.gz into /var/lib/foo
+      ansible.builtin.unarchive:
+        src: /tmp/cache-lib/cache-master-linux-amd64.tar.gz
+        remote_src: true
+        dest: /tmp/cache-lib/
+
+    - name: Copy custom Redis configuration
+      become: true
+      notify: restart redis
+      ansible.builtin.copy:
+        src: /tmp/cache-lib/cache-master-linux-amd64/libcache.so
+        remote_src: true
+        dest: /usr/lib/redis/modules/
+        owner: redis
+        group: redis
+        force: true
+        mode: "0755"
+
+    #    - name: Delete download dir
+    #      ansible.builtin.file:
+    #        path: /tmp/cache-lib
+    #        state: absent
+
+    - name: Allow port 6379 for redis
+      become: true
+      community.general.ufw:
+        state: enabled
+        rule: allow
+        proto: tcp
+        port: "6379"
+
+  handlers:
+    - name: Restart redis
+      listen: restart redis
+      ansible.builtin.service:
+        name: redis
+        enabled: true
+        state: restarted

tests/cache/base.py

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+# SPDX-FileCopyrightText: 2023 Aravinth Manivannan <realaravinth@batsense.net>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+import os
+
+
+def test_redis_is_listening(host):
+    socket = host.socket(f"tcp://0.0.0.0:6379")
+    assert socket.is_listening
+
+
+def test_redis_config_exists(host):
+    config = host.file("/etc/redis/redis.conf")
+    assert config.exists
+    assert config.is_file
+
+
+def test_redis_service_running_and_enabled(host):
+    service = host.service("redis")
+    assert service.is_running
+    assert service.is_enabled