write_http expected to be own package on CentOS 8

As of CentOS 8 the write_http is in its own subpackage
so must be installed on CentOS 8.

manifests/plugin/disk.pp

@@ -12,7 +12,7 @@
 
   include collectd
 
-  if $facts['os']['family'] == 'RedHat' {
+  if $facts['os']['family'] == 'RedHat' and versioncmp($facts['os']['release']['major'],'8') >= 0 {
     if $manage_package != undef {
       $_manage_package = $manage_package
     } else {

manifests/plugin/write_http.pp

@@ -1,8 +1,14 @@
-# https://collectd.org/wiki/index.php/Plugin:Write_HTTP
+# @summary Enable write_http plugin
+#
+# @see  https://collectd.org/wiki/index.php/Plugin:Write_HTTP
+#
+# @parameter Manage a collectd-write_http package? If undef a suitable value per OS will be chosen.
+#
 class collectd::plugin::write_http (
   Enum['present', 'absent']          $ensure = 'present',
   Hash[String, Hash[String, Scalar]] $nodes = {},
-  Hash[String, Hash[String, Scalar]] $urls  = {}
+  Hash[String, Hash[String, Scalar]] $urls  = {},
+  Optional[Boolean]                  $manage_package = undef,
 ) {
 
   include collectd
@@ -11,6 +17,21 @@
     fail('Only one of nodes or urls is supposed to be defined')
   }
 
+  if $manage_package !~ Undef {
+    $_manage_package = $manage_package
+  } else {
+    if $facts['os']['family'] == 'RedHat' and versioncmp($facts['os']['release']['major'],'8') >= 0 {
+      $_manage_package = true
+    } else {
+      $_manage_package = false
+    }
+  }
+  if $_manage_package {
+    package{'collectd-write_http':
+      ensure => $ensure,
+    }
+  }
+
   $endpoints = merge($nodes, $urls)
   collectd::plugin { 'write_http':
     ensure  => $ensure,

spec/acceptance/class_plugin_disk_spec.rb

@@ -0,0 +1,44 @@
+require 'spec_helper_acceptance'
+
+describe 'collectd::plugin::disk class' do
+  context 'basic parameters' do
+    # Using puppet_apply as a helper
+    it 'works idempotently with no errors' do
+      pp = <<-EOS
+      class{'collectd':
+        utils => true,
+      }
+      class{'collectd::plugin::disk': }
+      # Add one write plugin to keep logs quiet
+      class{'collectd::plugin::csv':}
+      # Create a socket to query
+      class{'collectd::plugin::unixsock':
+        socketfile  => '/var/run/collectd-sock',
+        socketgroup => 'root',
+      }
+
+      EOS
+      # Run 3 times since the collectd_version
+      # fact is impossible until collectd is
+      # installed.
+      apply_manifest(pp, catch_failures: false)
+      apply_manifest(pp, catch_failures: true)
+      apply_manifest(pp, catch_changes: true)
+      # Wait to get some data
+      shell('sleep 10')
+    end
+
+    describe service('collectd') do
+      it { is_expected.to be_running }
+    end
+
+    describe command('collectdctl -s /var/run/collectd-sock listval') do
+      its(:exit_status) { is_expected.to eq 0 }
+      # the reason debian does not report disk metrics on docker images despite the
+      # module being loaded is an exercise for the reader.
+      if fact('osfamily') != 'Debian'
+        its(:stdout) { is_expected.to match %r{disk_time} }
+      end
+    end
+  end
+end

spec/acceptance/class_plugin_write_http_spec.rb

@@ -0,0 +1,30 @@
+require 'spec_helper_acceptance'
+
+describe 'collectd::plugin::write_http class' do
+  context 'basic parameters' do
+    # Using puppet_apply as a helper
+    it 'works idempotently with no errors' do
+      pp = <<-EOS
+      class{'collectd':}
+      class { 'collectd::plugin::write_http':
+        nodes => {
+          'collect1' => { 'url' => 'collect1.example.org', 'format' => 'JSON' },
+          'collect2' => { 'url' => 'collect2.example.org'},
+        }
+      }
+      EOS
+      # Run 3 times since the collectd_version
+      # fact is impossible until collectd is
+      # installed.
+      apply_manifest(pp, catch_failures: false)
+      apply_manifest(pp, catch_failures: true)
+      apply_manifest(pp, catch_changes: true)
+      # Wait to get some data
+      shell('sleep 10')
+    end
+
+    describe service('collectd') do
+      it { is_expected.to be_running }
+    end
+  end
+end

spec/classes/collectd_plugin_disk_spec.rb

@@ -108,8 +108,8 @@
         end
       end
 
-      case facts[:os]['family']
-      when 'RedHat'
+      case [facts[:os]['family'], facts[:os]['release']['major']]
+      when %w[RedHat 8]
         context ':manage_package => undef  with collectd 5.5 and up' do
           let :facts do
             facts.merge(collectd_version: '5.5')

spec/classes/collectd_plugin_write_http_spec.rb

@@ -29,6 +29,12 @@
             content: "#\ Generated by Puppet\n<LoadPlugin write_http>\n  Globals false\n</LoadPlugin>\n\n<Plugin \"write_http\">\n  <URL \"collectd.org.1\">\n\n    Format \"JSON\"\n  </URL>\n\n</Plugin>\n\n"
           )
         end
+        case [facts[:os]['family'], facts[:os]['release']['major']]
+        when %w[RedHat 8]
+          it { is_expected.to contain_package('collectd-write_http') }
+        else
+          it { is_expected.not_to contain_package('collectd-write_http') }
+        end
       end
 
       context ':ensure => present and :nodes => { \'collectd\' => { \'url\' => \'collectd.org.1\', \'format\' => \'JSON\'}}' do