Merge pull request #1 from inuits/master

Working base profile for memcached exporter

Author: roidelapluie

README.md

@@ -20,6 +20,7 @@ All variables which can be overridden are stored in [defaults/main.yml](defaults
 | Name           | Default Value | Description                        |
 | -------------- | ------------- | -----------------------------------|
 | `memcached_exporter_web_listen_address` | "0.0.0.0:9150" | Address on which memcached-exporter will listen |
+| `memcached_address` | "localhost:11211" | Address on which memcached itself is running |
 
 ## Example
 

defaults/main.yml

@@ -1,5 +1,8 @@
 ---
+memcached_exporter_version: 0.7.0
+memcached_exporter_binary_local_dir: ""
 memcached_exporter_web_listen_address: "0.0.0.0:9150"
+memcached_address: "localhost:11211"
 
 # Internal variables
 _memcached_exporter_system_user: "memcached_exporter"

molecule/alternative/playbook.yml

@@ -3,4 +3,5 @@
   any_errors_fatal: true
   roles:
     - ansible-memcached-exporter
-  vars: []
+  vars:
+    memcached_exporter_web_listen_address: "0.0.0.0:9155"

molecule/alternative/tests/test_alternative.py

@@ -1,6 +1,20 @@
-import pytest
 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("memcached_exporter")
+    assert s.is_enabled
+    assert s.is_running
+
+
+def test_socket(host):
+    sockets = [
+        "tcp://127.0.0.1:9155"
+    ]
+    for socket in sockets:
+        s = host.socket(socket)
+        assert s.is_listening

molecule/default/tests/test_default.py

@@ -3,3 +3,18 @@
 
 testinfra_hosts = testinfra.utils.ansible_runner.AnsibleRunner(
     os.environ['MOLECULE_INVENTORY_FILE']).get_hosts('all')
+
+
+def test_service(host):
+    s = host.service("memcached_exporter")
+    assert s.is_enabled
+    assert s.is_running
+
+
+def test_socket(host):
+    sockets = [
+        "tcp://127.0.0.1:9150"
+    ]
+    for socket in sockets:
+        s = host.socket(socket)
+        assert s.is_listening

tasks/install.yml

@@ -14,3 +14,48 @@
     system: true
     createhome: false
     home: /
+
+- block:
+    - name: Download memcached_exporter binary to local folder
+      become: false
+      get_url:
+        url: "https://github.com/prometheus/memcached_exporter/releases/download/v{{ memcached_exporter_version }}/memcached_exporter-{{ memcached_exporter_version }}.linux-{{ go_arch }}.tar.gz"
+        dest: "/tmp/memcached_exporter-{{ memcached_exporter_version }}.linux-{{ go_arch }}.tar.gz"
+        checksum: "sha256:{{ memcached_exporter_checksum }}"
+        mode: '0644'
+      register: _download_binary
+      until: _download_binary is succeeded
+      retries: 5
+      delay: 2
+      delegate_to: localhost
+      check_mode: false
+
+    - name: Unpack memcached_exporter binary
+      become: false
+      unarchive:
+        src: "/tmp/memcached_exporter-{{ memcached_exporter_version }}.linux-{{ go_arch }}.tar.gz"
+        dest: "/tmp"
+        creates: "/tmp/memcached_exporter-{{ memcached_exporter_version }}.linux-{{ go_arch }}/memcached_exporter"
+      delegate_to: localhost
+      check_mode: false
+
+    - name: Propagate memcached_exporter binaries
+      copy:
+        src: "/tmp/memcached_exporter-{{ memcached_exporter_version }}.linux-{{ go_arch }}/memcached_exporter"
+        dest: "{{ _memcached_exporter_binary_install_dir }}/memcached_exporter"
+        mode: 0755
+        owner: root
+        group: root
+      notify: restart memcached_exporter
+      when: not ansible_check_mode
+  when: memcached_exporter_binary_local_dir | length == 0
+
+- name: propagate locally distributed memcached_exporter binary
+  copy:
+    src: "{{ memcached_exporter_binary_local_dir }}/memcached_exporter"
+    dest: "{{ _memcached_exporter_binary_install_dir }}/memcached_exporter"
+    mode: 0755
+    owner: root
+    group: root
+  when: memcached_exporter_binary_local_dir | length > 0
+  notify: restart memcached_exporter

tasks/preflight.yml

@@ -3,3 +3,68 @@
   assert:
     that: ansible_service_mgr == 'systemd'
     msg: "This module only works with systemd"
+
+- name: Naive assertion of proper listen address
+  assert:
+    that:
+      - "':' in memcached_exporter_web_listen_address"
+
+- name: Check if memcached_exporter is installed
+  stat:
+    path: "{{ _memcached_exporter_binary_install_dir }}/memcached_exporter"
+  register: __memcached_exporter_is_installed
+  check_mode: false
+  tags:
+    - memcached_exporter_install
+
+## NO VERSION IN MEMCACHED EXPORTER FOR NOW
+# - name: Gather currently installed memcached_exporter version (if any)
+#   command: "{{ _memcached_exporter_binary_install_dir }}/memcached_exporter --version"
+#   args:
+#     warn: false
+#   changed_when: false
+#   register: __memcached_exporter_current_version_output
+#   check_mode: false
+#   when: __memcached_exporter_is_installed.stat.exists
+#   tags:
+#     - memcached_exporter_install
+#     - skip_ansible_lint
+
+- block:
+    - name: Get latest release
+      uri:
+        url: "https://api.github.com/repos/prometheus/memcached_exporter/releases/latest"
+        method: GET
+        return_content: true
+        status_code: 200
+        body_format: json
+        user: "{{ lookup('env', 'GH_USER') | default(omit) }}"
+        password: "{{ lookup('env', 'GH_TOKEN') | default(omit) }}"
+      no_log: "{{ not lookup('env', 'MOLECULE_DEBUG') | bool }}"
+      register: _latest_release
+      until: _latest_release.status == 200
+      retries: 5
+
+    - name: "Set memcached_exporter version to {{ _latest_release.json.tag_name[1:] }}"
+      set_fact:
+        memcached_exporter_version: "{{ _latest_release.json.tag_name[1:] }}"
+  when:
+    - memcached_exporter_version == "latest"
+    - memcached_exporter_binary_local_dir | length == 0
+  delegate_to: localhost
+  run_once: true
+
+- block:
+    - name: Get checksum list from github
+      set_fact:
+        _checksums: "{{ lookup('url', 'https://github.com/prometheus/memcached_exporter/releases/download/v' + memcached_exporter_version + '/sha256sums.txt', wantlist=True) | list }}"
+      run_once: true
+
+    - name: "Get checksum for {{ go_arch }} architecture"
+      set_fact:
+        memcached_exporter_checksum: "{{ item.split(' ')[0] }}"
+      with_items: "{{ _checksums }}"
+      when:
+        - "('linux-' + go_arch + '.tar.gz') in item"
+  delegate_to: localhost
+  when: memcached_exporter_binary_local_dir | length == 0

templates/memcached_exporter.service.j2

@@ -10,7 +10,7 @@ StartLimitIntervalSec=0
 Type=simple
 User={{ _memcached_exporter_system_user }}
 Group={{ _memcached_exporter_system_group }}
-ExecStart=/usr/local/bin/memcached_exporter
+ExecStart={{ _memcached_exporter_binary_install_dir }}/memcached_exporter --memcached.address={{ memcached_address }} --web.listen-address={{ memcached_exporter_web_listen_address }}
 SyslogIdentifier=memcached_exporter
 Restart=always
 RestartSec=5

vars/main.yml

@@ -7,3 +7,7 @@ go_arch_map:
   armv6l: 'armv6'
 
 go_arch: "{{ go_arch_map[ansible_architecture] | default(ansible_architecture) }}"
+
+_memcached_exporter_binary_install_dir: "/usr/local/bin"
+_memcached_exporter_system_group: "mem-exp"
+_memcached_exporter_system_user: "{{ _memcached_exporter_system_group }}"