TTL mechanism support with expirer service

Aims to support a TTL mechanism for data entering Ceilometer
collector database.
TTL is very useful to configure when getting a lot of meters.

implement blueprint ttl-support
Change-Id: I9d98e8b833ad94fd79722dee7226e7f4f03aaa2e
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>

examples/site.pp

@@ -58,6 +58,9 @@ node default {
   class { 'ceilometer::alarm::evaluator':
   }
 
-
+  # Purge 1 month old meters
+  class { 'ceilometer::expirer':
+    time_to_live => '2592000'
+  }
 
 }

manifests/expirer.pp

@@ -0,0 +1,74 @@
+#
+# Copyright (C) 2013 eNovance SAS <licensing@enovance.com>
+#
+# Author: Emilien Macchi <emilien.macchi@enovance.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# == Class: ceilometer::expirer
+#
+# Setups Ceilometer Expirer service to enable TTL feature.
+#
+# === Parameters
+#
+# [*time_to_live*]
+#   (optional) Number of seconds that samples are kept in the database.
+#   Should be a valid integer
+#   Defaults to '-1' to disable TTL and keep forever the datas.
+#
+#  [*minute*]
+#    (optional) Defaults to '1'.
+#
+#  [*hour*]
+#    (optional) Defaults to '0'.
+#
+#  [*monthday*]
+#    (optional) Defaults to '*'.
+#
+#  [*month*]
+#    (optional) Defaults to '*'.
+#
+#  [*weekday*]
+#    (optional) Defaults to '*'.
+#
+
+class ceilometer::expirer (
+  $time_to_live   = '-1',
+  $minute         = 1,
+  $hour           = 0,
+  $monthday       = '*',
+  $month          = '*',
+  $weekday        = '*',
+) {
+
+  include ceilometer::params
+
+  Package<| title == 'ceilometer-common' |> -> Class['ceilometer::expirer']
+
+  ceilometer_config {
+    'database/time_to_live': value => $time_to_live;
+  }
+
+  cron { 'ceilometer-expirer':
+    command     => $ceilometer::params::expirer_command,
+    environment => 'PATH=/bin:/usr/bin:/usr/sbin',
+    user        => 'ceilometer',
+    minute      => $minute,
+    hour        => $hour,
+    monthday    => $monthday,
+    month       => $month,
+    weekday     => $weekday
+  }
+
+
+}

manifests/params.pp

@@ -2,9 +2,9 @@
 #
 class ceilometer::params {
 
-  $dbsync_command =
-    'ceilometer-dbsync --config-file=/etc/ceilometer/ceilometer.conf'
-  $log_dir        = '/var/log/ceilometer'
+  $dbsync_command  = 'ceilometer-dbsync --config-file=/etc/ceilometer/ceilometer.conf'
+  $log_dir         = '/var/log/ceilometer'
+  $expirer_command = 'ceilometer-expirer'
 
   case $::osfamily {
     'RedHat': {

spec/classes/ceilometer_expirer_spec.rb

@@ -0,0 +1,87 @@
+#
+# Copyright (C) 2013 eNovance SAS <licensing@enovance.com>
+#
+# Author: Emilien Macchi <emilien.macchi@enovance.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# Unit tests for ceilometer::expirer
+#
+
+require 'spec_helper'
+
+describe 'ceilometer::expirer' do
+
+  let :pre_condition do
+    "class { 'ceilometer': metering_secret => 's3cr3t' }"
+  end
+
+  let :params do
+    { :time_to_live => '-1' }
+  end
+
+  shared_examples_for 'ceilometer-expirer' do
+
+    it { should include_class('ceilometer::params') }
+
+    it 'installs ceilometer common package' do
+      should contain_package('ceilometer-common').with(
+        :ensure => 'present',
+        :name   => platform_params[:common_package_name]
+      )
+    end
+
+    it 'configures a cron' do
+      should contain_cron('ceilometer-expirer').with(
+        :command     => 'ceilometer-expirer',
+        :environment => 'PATH=/bin:/usr/bin:/usr/sbin',
+        :user        => 'ceilometer',
+        :minute      => 1,
+        :hour        => 0,
+        :monthday    => '*',
+        :month       => '*',
+        :weekday     => '*'
+      )
+    end
+
+    it 'configures database section in ceilometer.conf' do
+      should contain_ceilometer_config('database/time_to_live').with_value( params[:time_to_live] )
+    end
+
+  end
+
+  context 'on Debian platforms' do
+    let :facts do
+      { :osfamily => 'Debian' }
+    end
+
+    let :platform_params do
+      { :common_package_name => 'ceilometer-common' }
+    end
+
+    it_configures 'ceilometer-expirer'
+  end
+
+  context 'on RedHat platforms' do
+    let :facts do
+      { :osfamily => 'RedHat' }
+    end
+
+    let :platform_params do
+      { :common_package_name => 'openstack-ceilometer-common' }
+    end
+
+    it_configures 'ceilometer-expirer'
+  end
+
+end