From 872179cbcda6739340a0de44946cc8a2ddf390db Mon Sep 17 00:00:00 2001
From: phil <phil@systemausfall.org>
Date: Wed, 15 Nov 2023 12:32:00 +0100
Subject: [PATCH] Add Promehteus Exporter

---
 README.md                                    | 12 +++--------
 defaults/main.yml                            |  4 ++++
 handlers/main.yml                            |  7 +++++++
 tasks/main.yml                               |  5 +++++
 tasks/prometheus.yml                         | 21 ++++++++++++++++++++
 templates/systemd/phpfpm_exporter.service.j2 | 13 ++++++++++++
 6 files changed, 53 insertions(+), 9 deletions(-)
 create mode 100644 tasks/prometheus.yml
 create mode 100644 templates/systemd/phpfpm_exporter.service.j2

diff --git a/README.md b/README.md
index 0f445fa..42339e5 100644
--- a/README.md
+++ b/README.md
@@ -10,15 +10,6 @@ lassen sich daraus Services für verschiedene Anwendungen erstellen.
 Für die PHP-Konfiguration sind verschiedene defaults gesetzt. Über die jeweilige `host_vars` lassen sich im Dictionary `php`
 die defaults überschreiben.
 
-| Varible | Wert |
-|--|--|
-| date_timezone | string |
-| default_charset | string |
-| max_execution_time | int |
-| memory_limit | string |
-| post_max_size | string |
-| upload_max_filesize | string |
-
 Beispiel:
 ```YAML
 php:
@@ -26,6 +17,9 @@ php:
   post_max_size: 30M
 ```
 
+Durch setzen der Variable `phpfpm_exporter: true` wird ein [Prometheus Exporter](https://github.com/Lusitaniae/phpfpm_exporter)
+installiert. Das zugehörife [Grafana Dashboard](https://grafana.com/grafana/dashboards/5714-php-fpm-multi-pool/) trägt die ID `5714`.
+
 ## Nutzerkonto und PHP-FPM-Service anlegen
 
 Per Ansible Tag kann ein Systemkonto und ein PHP-FPM-Socket und Service angelegt werden. Am Beispiel des playbooks `php.yml`:
diff --git a/defaults/main.yml b/defaults/main.yml
index 57d4d2f..e354767 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -18,3 +18,7 @@ php_fpm_config:
   assert.active: "Off"
   mail.add_x_header: "Off"
   session.use_strict_mode: 1
+
+phpfpm_exporter_github_api_url: https://api.github.com/repos/Lusitaniae/phpfpm_exporter/releases/latest
+phpfpm_exporter_socket_directories: /run/php/
+phpfpm_exporter_listen_address: ":9253"
diff --git a/handlers/main.yml b/handlers/main.yml
index f0d9b28..8c209d4 100644
--- a/handlers/main.yml
+++ b/handlers/main.yml
@@ -21,3 +21,10 @@
 - name: Reload systemd
   ansible.builtin.systemd:
     daemon_reload: true
+
+- name: Start phpfpm_exporter
+  ansible.builtin.systemd:
+    name: phpfpm_exporter
+    daemon_reload: true
+    state: started
+    enabled: true
diff --git a/tasks/main.yml b/tasks/main.yml
index a1bcca7..fc3d345 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -18,3 +18,8 @@
 - name: User tasks
   ansible.builtin.import_tasks: user.yml
   tags: never, user
+
+- name: Prometheus exporter
+  ansible.builtin.import_tasks: prometheus.yml
+  tags: exporter
+  when: phpfpm_exporter is defined and phpfpm_exporter
diff --git a/tasks/prometheus.yml b/tasks/prometheus.yml
new file mode 100644
index 0000000..c8f2150
--- /dev/null
+++ b/tasks/prometheus.yml
@@ -0,0 +1,21 @@
+---
+- name: "Prometheus | Get Download URL"
+  ansible.builtin.shell:
+    cmd: curl -sL "{{ phpfpm_exporter_github_api_url }}" | jq -r '.assets[].browser_download_url' | grep -E linux-amd64.tar.gz
+  register: exporter_download_url
+
+- name: "Prometheus | Download binary"
+  ansible.builtin.unarchive:
+    src: "{{ exporter_download_url.stdout }}"
+    dest: /usr/local/bin
+    remote_src: true
+    exclude:
+      - LICENSE
+    mode: "0755"
+
+- name: "Prometheus | Copy systemd service file"
+  ansible.builtin.template:
+    src: systemd/phpfpm_exporter.service.j2
+    dest: /etc/systemd/system/phpfpm_exporter.service
+    mode: "0644"
+  notify: Start phpfpm_exporter
diff --git a/templates/systemd/phpfpm_exporter.service.j2 b/templates/systemd/phpfpm_exporter.service.j2
new file mode 100644
index 0000000..099ee4b
--- /dev/null
+++ b/templates/systemd/phpfpm_exporter.service.j2
@@ -0,0 +1,13 @@
+# Ansible managed
+
+[Unit]
+Description = PHP-FPM Prometheus Exporter
+
+[Service]
+SyslogIdentifier = phpfpm_exporter
+
+ExecStart =/usr/local/bin/phpfpm_exporter --phpfpm.socket-directories={{ phpfpm_exporter_socket_directories }}  --web.listen-address="{{ phpfpm_exporter_listen_address }}"
+
+
+[Install]
+WantedBy = multi-user.target