Add apache exporter support

data/defaults.yaml

@@ -303,3 +303,12 @@ prometheus::collectd_exporter::manage_group: true
 prometheus::collectd_exporter::manage_service: true
 prometheus::collectd_exporter::manage_user: true
 prometheus::collectd_exporter::options: ''
+prometheus::apache_exporter::scrape_uri: 'http://localhost/server-status?auto'
+prometheus::apache_exporter::download_extension: 'tar.gz'
+prometheus::apache_exporter::download_url_base: 'https://github.com/Lusitaniae/apache_exporter/releases'
+prometheus::apache_exporter::extra_groups: []
+prometheus::apache_exporter::group: 'apache-exporter'
+prometheus::apache_exporter::package_ensure: 'latest'
+prometheus::apache_exporter::package_name: 'apache_exporter'
+prometheus::apache_exporter::user: 'apache-exporter'
+prometheus::apache_exporter::version: '0.5.0'

manifests/apache_exporter.pp

@@ -0,0 +1,137 @@
+# Class: prometheus::apache_exporter
+#
+# This module manages prometheus apache_exporter
+#
+# Parameters:
+#  [*arch*]
+#  Architecture (amd64 or i386)
+#
+#  [*bin_dir*]
+#  Directory where binaries are located
+#
+#  [*config_mode*]
+#  The permissions of the configuration files
+#
+#  [*download_extension*]
+#  Extension for the release binary archive
+#
+#  [*download_url*]
+#  Complete URL corresponding to the where the release binary archive can be downloaded
+#
+#  [*download_url_base*]
+#  Base URL for the binary archive
+#
+#  [*extra_groups*]
+#  Extra groups to add the binary user to
+#
+#  [*extra_options*]
+#  Extra options added to the startup command
+#
+#  [*group*]
+#  Group under which the binary is running
+#
+#  [*init_style*]
+#  Service startup scripts style (e.g. rc, upstart or systemd)
+#
+#  [*install_method*]
+#  Installation method: url or package (only url is supported currently)
+#
+#  [*manage_group*]
+#  Whether to create a group for or rely on external code for that
+#
+#  [*manage_service*]
+#  Should puppet manage the service? (default true)
+#
+#  [*manage_user*]
+#  Whether to create user or rely on external code for that
+#
+#  [*os*]
+#  Operating system (linux is the only one supported)
+#
+#  [*package_ensure*]
+#  If package, then use this for package ensure default 'latest'
+#
+#  [*package_name*]
+#  The binary package name - not available yet
+#
+#  [*purge_config_dir*]
+#  Purge config files no longer generated by Puppet
+#
+#  [*restart_on_change*]
+#  Should puppet restart the service on configuration change? (default true)
+#
+#  [*scrape_uri*]
+#  The URI for the Apache status page
+#
+#  [*service_enable*]
+#  Whether to enable the service from puppet (default true)
+#
+#  [*service_ensure*]
+#  State ensured for the service (default 'running')
+#
+#  [*user*]
+#  User which runs the service
+#
+#  [*version*]
+#  The binary release version
+
+class prometheus::apache_exporter (
+  String[1] $scrape_uri,
+  String[1] $download_extension,
+  Variant[Stdlib::HTTPSUrl, Stdlib::HTTPUrl] $download_url_base,
+  Array[String[1]] $extra_groups,
+  String[1] $group,
+  String[1] $package_ensure,
+  String[1] $package_name,
+  String[1] $user,
+  String[1] $version,
+  Boolean $purge_config_dir                                          = true,
+  Boolean $restart_on_change                                         = true,
+  Boolean $service_enable                                            = true,
+  String[1] $service_ensure                                          = 'running',
+  String[1] $init_style                                              = $prometheus::init_style,
+  String[1] $install_method                                          = $prometheus::install_method,
+  Boolean $manage_group                                              = true,
+  Boolean $manage_service                                            = true,
+  Boolean $manage_user                                               = true,
+  String[1] $os                                                      = $prometheus::os,
+  String $extra_options                                              = '',
+  Optional[Variant[Stdlib::HTTPSUrl, Stdlib::HTTPUrl]] $download_url = undef,
+  String[1] $config_mode                                             = $prometheus::config_mode,
+  String[1] $arch                                                    = $prometheus::real_arch,
+  Stdlib::Absolutepath $bin_dir                                      = $prometheus::bin_dir,
+) inherits prometheus {
+
+  #Please provide the download_url for versions < 0.9.0
+  $real_download_url    = pick($download_url,"${download_url_base}/download/v${version}/${package_name}-${version}.${os}-${arch}.${download_extension}")
+  $notify_service = $restart_on_change ? {
+    true    => Service['apache_exporter'],
+    default => undef,
+  }
+
+  $options = "-scrape_uri \"${scrape_uri}\" ${extra_options}"
+
+  prometheus::daemon { 'apache_exporter':
+    install_method     => $install_method,
+    version            => $version,
+    download_extension => $download_extension,
+    os                 => $os,
+    arch               => $arch,
+    real_download_url  => $real_download_url,
+    bin_dir            => $bin_dir,
+    notify_service     => $notify_service,
+    package_name       => $package_name,
+    package_ensure     => $package_ensure,
+    manage_user        => $manage_user,
+    user               => $user,
+    extra_groups       => $extra_groups,
+    group              => $group,
+    manage_group       => $manage_group,
+    purge              => $purge_config_dir,
+    options            => $options,
+    init_style         => $init_style,
+    service_ensure     => $service_ensure,
+    service_enable     => $service_enable,
+    manage_service     => $manage_service,
+  }
+}

spec/acceptance/apache_exporter_spec.rb

@@ -0,0 +1,69 @@
+require 'spec_helper_acceptance'
+
+describe 'prometheus apache exporter' do
+  it 'apache_exporter works idempotently with no errors' do
+    if default[:platform] =~ %r{ubuntu-18.04-amd64}
+      pp = "package{'iproute2': ensure => present}"
+      apply_manifest(pp, catch_failures: true)
+    end
+    pp = 'include prometheus::apache_exporter'
+    # Run it twice and test for idempotency
+    apply_manifest(pp, catch_failures: true)
+    apply_manifest(pp, catch_changes: true)
+  end
+
+  describe 'default install' do
+    describe service('apache_exporter') do
+      it { is_expected.to be_running }
+      it { is_expected.to be_enabled }
+    end
+    # the class installs an the apache_exporter that listens on port 9104
+    describe port(9117) do
+      it { is_expected.to be_listening.with('tcp6') }
+    end
+    describe process('apache_exporter') do
+      its(:args) { is_expected.to match %r{\ -scrape_uri http://localhost/server-status\?auto} }
+    end
+  end
+
+  describe 'apache_exporter update from 0.4.0 to 0.5.0' do
+    it 'is idempotent' do
+      pp = "class{'prometheus::apache_exporter': version => '0.4.0'}"
+      # Run it twice and test for idempotency
+      apply_manifest(pp, catch_failures: true)
+      apply_manifest(pp, catch_changes: true)
+    end
+
+    describe service('apache_exporter') do
+      it { is_expected.to be_running }
+      it { is_expected.to be_enabled }
+    end
+
+    describe process('apache_exporter') do
+      its(:args) { is_expected.to match %r{\ -scrape_uri http://localhost/server-status\?auto} }
+    end
+
+    describe port(9117) do
+      it { is_expected.to be_listening.with('tcp6') }
+    end
+    it 'is idempotent' do
+      pp = "class{'prometheus::apache_exporter': version => '0.5.0'}"
+      # Run it twice and test for idempotency
+      apply_manifest(pp, catch_failures: true)
+      apply_manifest(pp, catch_changes: true)
+    end
+
+    describe service('apache_exporter') do
+      it { is_expected.to be_running }
+      it { is_expected.to be_enabled }
+    end
+
+    describe process('apache_exporter') do
+      its(:args) { is_expected.to match %r{\ -scrape_uri http://localhost/server-status\?auto} }
+    end
+
+    describe port(9117) do
+      it { is_expected.to be_listening.with('tcp6') }
+    end
+  end
+end

spec/classes/apache_exporter_spec.rb

@@ -0,0 +1,63 @@
+require 'spec_helper'
+
+describe 'prometheus::apache_exporter' do
+  on_supported_os.each do |os, facts|
+    context "on #{os}" do
+      let(:facts) do
+        facts.merge(os_specific_facts(facts))
+      end
+
+      context 'with all defaults' do
+        let(:params) do
+          {
+            version: '0.5.0',
+            arch: 'amd64',
+            os: 'linux',
+            bin_dir: '/usr/local/bin',
+            install_method: 'url'
+          }
+        end
+
+        describe 'with specific params' do
+          it { is_expected.to compile.with_all_deps }
+          it { is_expected.to contain_archive('/tmp/apache_exporter-0.5.0.tar.gz') }
+          it { is_expected.to contain_class('prometheus') }
+          it { is_expected.to contain_group('apache-exporter') }
+          it { is_expected.to contain_user('apache-exporter') }
+          it { is_expected.to contain_prometheus__daemon('apache_exporter').with('options' => '-scrape_uri "http://localhost/server-status?auto" ') }
+          it { is_expected.to contain_service('apache_exporter') }
+        end
+        describe 'install correct binary' do
+          it { is_expected.to contain_file('/usr/local/bin/apache_exporter').with('target' => '/opt/apache_exporter-0.5.0.linux-amd64/apache_exporter') }
+        end
+      end
+
+      context 'with version, scrape_uri and extra options specified' do
+        let(:params) do
+          {
+            scrape_uri: 'http://127.0.0.1/server-status?auto',
+            extra_options: '-test',
+            version: '0.4.0',
+            arch: 'amd64',
+            os: 'linux',
+            bin_dir: '/usr/local/bin',
+            install_method: 'url'
+          }
+        end
+
+        describe 'with specific params' do
+          it { is_expected.to compile.with_all_deps }
+          it { is_expected.to contain_archive('/tmp/apache_exporter-0.4.0.tar.gz') }
+          it { is_expected.to contain_class('prometheus') }
+          it { is_expected.to contain_group('apache-exporter') }
+          it { is_expected.to contain_user('apache-exporter') }
+          it { is_expected.to contain_prometheus__daemon('apache_exporter').with('options' => '-scrape_uri "http://127.0.0.1/server-status?auto" -test') }
+          it { is_expected.to contain_service('apache_exporter') }
+        end
+        describe 'install correct binary' do
+          it { is_expected.to contain_file('/usr/local/bin/apache_exporter').with('target' => '/opt/apache_exporter-0.4.0.linux-amd64/apache_exporter') }
+        end
+      end
+    end
+  end
+end