feat: Add fail2ban_exporter role (#294)

* feat: Add fail2ban_exporter role

---------

Signed-off-by: anviar <oleg.kluchkin+github@gmail.com>

Author: anviar

roles/fail2ban_exporter/README.md

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+<p><img src="https://www.circonus.com/wp-content/uploads/2015/03/sol-icon-itOps.png" alt="graph logo" title="graph" align="right" height="60" /></p>
+
+# Ansible Role: fail2ban_exporter
+
+## Description
+
+Deploy prometheus [fail2ban_exporter](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter) using ansible.
+
+## Requirements
+
+- Ansible >= 2.9 (It might work on previous versions, but we cannot guarantee it)
+- gnu-tar on Mac deployer host (`brew install gnu-tar`)
+- Passlib is required when using the basic authentication feature (`pip install passlib[bcrypt]`)
+
+## Role Variables
+
+All variables which can be overridden are stored in [defaults/main.yml](defaults/main.yml) file as well as in [meta/argument_specs.yml](meta/argument_specs.yml).
+Please refer to the [collection docs](https://prometheus-community.github.io/ansible/branch/main/fail2ban_exporter_role.html) for description and default values of the variables.
+
+## Example
+
+### Demo site
+
+We provide demo site for full monitoring solution based on prometheus and grafana. Repository with code and links to running instances is [available on github](https://github.com/prometheus/demo-site) and site is hosted on [DigitalOcean](https://digitalocean.com).
+
+## Local Testing
+
+The preferred way of locally testing the role is to use Docker and [molecule](https://github.com/ansible-community/molecule) (v3.x). You will have to install Docker on your system. See "Get started" for a Docker package suitable to for your system. Running your tests is as simple as executing `molecule test`.
+
+## Continuous Intergation
+
+Combining molecule and circle CI allows us to test how new PRs will behave when used with multiple ansible versions and multiple operating systems. This also allows use to create test scenarios for different role configurations. As a result we have a quite large test matrix which can take more time than local testing, so please be patient.
+
+## Contributing
+
+See [contributor guideline](CONTRIBUTING.md).
+
+## Troubleshooting
+
+See [troubleshooting](TROUBLESHOOTING.md).
+
+## License
+
+This project is licensed under MIT License. See [LICENSE](/LICENSE) for more details.

roles/fail2ban_exporter/defaults/main.yml

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+---
+fail2ban_exporter_version: 0.10.1
+fail2ban_exporter_binary_local_dir: ""
+fail2ban_exporter_binary_url: "https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/releases/v{{ fail2ban_exporter_version }}/downloads/\
+                               fail2ban_exporter_{{ fail2ban_exporter_version }}_linux_{{ go_arch }}.tar.gz"
+fail2ban_exporter_checksums_url: "https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/releases/v{{ fail2ban_exporter_version }}/downloads/\
+                               fail2ban_exporter_{{ fail2ban_exporter_version }}_checksums.txt"
+fail2ban_exporter_skip_install: false
+
+fail2ban_exporter_web_listen_address: "0.0.0.0:9191"
+fail2ban_exporter_socket: "/var/run/fail2ban/fail2ban.sock"
+fail2ban_exporter_binary_install_dir: "/usr/local/bin"
+
+fail2ban_exporter_username: ""
+fail2ban_exporter_password: ""

roles/fail2ban_exporter/handlers/main.yml

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+---
+- name: Restart fail2ban_exporter
+  listen: "restart fail2ban_exporter"
+  become: true
+  ansible.builtin.systemd:
+    daemon_reload: true
+    name: fail2ban_exporter
+    state: restarted
+  when:
+    - not ansible_check_mode

roles/fail2ban_exporter/meta/argument_specs.yml

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+---
+# yamllint disable rule:line-length
+argument_specs:
+  main:
+    short_description: "Prometheus fail2ban_exporter"
+    description:
+      - "Deploy prometheus L(fail2ban exporter,https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter) using ansible"
+    author:
+      - "Prometheus Community"
+    options:
+      fail2ban_exporter_version:
+        description: "fail2ban_exporter package version. Also accepts latest as parameter."
+        default: "0.10.1"
+      fail2ban_exporter_skip_install:
+        description: "fail2ban_exporter installation tasks gets skipped when set to true."
+        type: bool
+        default: false
+      fail2ban_exporter_binary_local_dir:
+        description:
+          - "Enables the use of local packages instead of those distributed on gitlab."
+          - "The parameter may be set to a directory where the C(fail2ban_exporter) binary is stored on the host where ansible is run."
+          - "This overrides the I(fail2ban_exporter_version) parameter"
+      fail2ban_exporter_binary_url:
+        description: "URL of the fail2ban_exporter binaries .tar.gz file"
+        default: "https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/releases/v{{ fail2ban_exporter_version }}/downloads/fail2ban_exporter_{{ fail2ban_exporter_version }}_linux_{{ go_arch }}.tar.gz"
+      fail2ban_exporter_checksums_url:
+        description: "URL of the fail2ban_exporter checksums file"
+        default: "https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/releases/v{{ fail2ban_exporter_version }}/downloads/fail2ban_exporter_{{ fail2ban_exporter_version }}_checksums.txt"
+      fail2ban_exporter_web_listen_address:
+        description: "Address on which fail2ban exporter will listen"
+        default: "0.0.0.0:9191"
+      fail2ban_exporter_binary_install_dir:
+        description:
+          - "I(Advanced)"
+          - "Directory to install fail2ban_exporter binary"
+        default: "/usr/local/bin"
+      fail2ban_exporter_socket:
+        description:
+          - "Path to the fail2ban server socket"
+        default: "/var/run/fail2ban/fail2ban.sock"
+      fail2ban_exporter_username:
+        description:
+          - "I(Advanced)"
+          - "Username to use to protect endpoints with basic auth"
+      fail2ban_exporter_password:
+        description:
+          - "I(Advanced)"
+          - "Password to use to protect endpoints with basic auth"

roles/fail2ban_exporter/meta/main.yml

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+---
+galaxy_info:
+  author: "Prometheus Community"
+  description: "Prometheus fail2ban_exporter"
+  license: "Apache"
+  min_ansible_version: "2.9"
+  platforms:
+    - name: "Ubuntu"
+      versions:
+        - "focal"
+        - "jammy"
+    - name: "Debian"
+      versions:
+        - "bullseye"
+        - "buster"
+    - name: "EL"
+      versions:
+        - "7"
+        - "8"
+        - "9"
+    - name: "Fedora"
+      versions:
+        - "37"
+        - '38'
+  galaxy_tags:
+    - "monitoring"
+    - "prometheus"
+    - "exporter"
+    - "metrics"
+    - "system"
+    - "fail2ban"

roles/fail2ban_exporter/molecule/alternative/molecule.yml

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+---
+provisioner:
+  inventory:
+    group_vars:
+      all:
+        fail2ban_exporter_binary_local_dir: "/tmp/fail2ban_exporter-linux-amd64_local"
+        fail2ban_exporter_web_listen_address: "127.0.1.1:9191"
+        go_arch: amd64
+        fail2ban_exporter_version: 0.10.1

roles/fail2ban_exporter/molecule/alternative/prepare.yml

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+---
+- name: Run local preparation
+  hosts: localhost
+  gather_facts: false
+  tasks:
+    - name: Download fail2ban_exporter binary to local folder
+      become: false
+      ansible.builtin.get_url:
+        url: "https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/releases/v{{ fail2ban_exporter_version }}/downloads/\
+              fail2ban_exporter_{{ fail2ban_exporter_version }}_linux_{{ go_arch }}.tar.gz"
+        dest: "/tmp/fail2ban_exporter_{{ fail2ban_exporter_version }}_linux_{{ go_arch }}.tar.gz"
+        mode: 0644
+      register: _download_binary
+      until: _download_binary is succeeded
+      retries: 5
+      delay: 2
+      check_mode: false
+
+    - name: Create local directory for binary
+      ansible.builtin.file:
+        path: "{{ fail2ban_exporter_binary_local_dir }}"
+        state: directory
+        mode: '0755'
+
+    - name: Unpack fail2ban_exporter binary
+      become: false
+      ansible.builtin.unarchive:
+        src: "/tmp/fail2ban_exporter_{{ fail2ban_exporter_version }}_linux_{{ go_arch }}.tar.gz"
+        dest: "{{ fail2ban_exporter_binary_local_dir }}"
+        creates: "{{ fail2ban_exporter_binary_local_dir }}/fail2ban_exporter"
+      check_mode: false

roles/fail2ban_exporter/molecule/alternative/tests/test_alternative.py

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+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import testinfra.utils.ansible_runner
+
+testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
+    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
+
+
+def test_service(host):
+    s = host.service("fail2ban_exporter")
+    try:
+        assert s.is_running
+    except AssertionError:
+        # Capture service logs
+        journal_output = host.run('journalctl -u fail2ban_exporter --since "1 hour ago"')
+        print("\n==== journalctl -u fail2ban_exporter Output ====\n")
+        print(journal_output)
+        print("\n============================================\n")
+        raise  # Re-raise the original assertion error
+
+
+def test_protecthome_property(host):
+    s = host.service("fail2ban_exporter")
+    p = s.systemd_properties
+    assert p.get("ProtectHome") == "yes"
+
+
+def test_socket(host):
+    sockets = [
+        "tcp://127.0.1.1:9191"
+    ]
+    for socket in sockets:
+        s = host.socket(socket)
+        assert s.is_listening

roles/fail2ban_exporter/molecule/default/molecule.yml

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+---
+provisioner:
+  inventory:
+    group_vars:
+      all:
+        fail2ban_exporter_web_listen_address: "127.0.0.1:9191"

roles/fail2ban_exporter/molecule/default/tests/test_default.py

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+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import os
+import testinfra.utils.ansible_runner
+
+testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
+    os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
+
+
+def test_files(host):
+    files = [
+        "/etc/systemd/system/fail2ban_exporter.service",
+        "/usr/local/bin/fail2ban_exporter"
+    ]
+    for file in files:
+        f = host.file(file)
+        assert f.exists
+        assert f.is_file
+
+
+def test_service(host):
+    s = host.service("fail2ban_exporter")
+    try:
+        assert s.is_running
+    except AssertionError:
+        # Capture service logs
+        journal_output = host.run('journalctl -u fail2ban_exporter --since "1 hour ago"')
+        print("\n==== journalctl -u fail2ban_exporter Output ====\n")
+        print(journal_output)
+        print("\n============================================\n")
+        raise  # Re-raise the original assertion error
+
+
+def test_protecthome_property(host):
+    s = host.service("fail2ban_exporter")
+    p = s.systemd_properties
+    assert p.get("ProtectHome") == "yes"
+
+
+def test_socket(host):
+    sockets = [
+        "tcp://127.0.0.1:9191"
+    ]
+    for socket in sockets:
+        s = host.socket(socket)
+        assert s.is_listening