add parameter max_open_files to server class

manifests/config.pp

@@ -3,7 +3,7 @@
 
   assert_private()
 
-  $max_open_files = $prometheus::max_open_files
+  $max_open_files = $prometheus::server::max_open_files
 
   $prometheus_v2 = versioncmp($prometheus::server::version, '2.0.0') >= 0
 

manifests/server.pp

@@ -44,6 +44,7 @@
   Boolean $manage_config                                                        = $prometheus::manage_config,
   Optional[Variant[Stdlib::HTTPurl, Stdlib::Unixpath, String[1]]] $external_url = $prometheus::external_url,
   Optional[Array[Hash[String[1], Any]]] $collect_scrape_jobs                    = $prometheus::collect_scrape_jobs,
+  Optional[Integer] $max_open_files                                             = $prometheus::max_open_files,
   Stdlib::Absolutepath $usershell                                               = $prometheus::usershell,
 ) inherits prometheus {
 

spec/classes/server_spec.rb

@@ -0,0 +1,51 @@
+require 'spec_helper'
+
+describe 'prometheus::server' do
+  on_supported_os.each do |os, facts|
+    context "on #{os}" do
+      let(:facts) do
+        facts.merge(os_specific_facts(facts))
+      end
+
+      [{ version: '2.0.0-rc.1', bin_dir: '/usr/local/bin', install_method: 'url' }].each do |parameters|
+        context "with parameters #{parameters}" do
+          let(:params) do
+            parameters
+          end
+
+          if ['centos-7-x86_64', 'centos-8-x86_64', 'debian-8-x86_64', 'debian-9-x86_64', 'redhat-7-x86_64', 'redhat-8-x86_64', 'ubuntu-16.04-x86_64', 'ubuntu-18.04-x86_64'].include?(os)
+            prom_version = parameters[:version] || '1.5.2'
+            prom_major = prom_version[0]
+            it {
+              is_expected.to contain_class('systemd')
+            }
+
+            it {
+              is_expected.to contain_systemd__unit_file('prometheus.service').with(
+                'content' => File.read(fixtures('files', "prometheus#{prom_major}.systemd"))
+              )
+            }
+            describe 'max_open_files' do
+              context 'by default' do
+                it {
+                  content = catalogue.resource('systemd::unit_file', 'prometheus.service').send(:parameters)[:content]
+                  expect(content).not_to include('LimitNOFILE')
+                }
+              end
+              context 'when set to 1000000' do
+                let(:params) do
+                  parameters.merge('max_open_files' => 1_000_000)
+                end
+
+                it {
+                  content = catalogue.resource('systemd::unit_file', 'prometheus.service').send(:parameters)[:content]
+                  expect(content).to include('LimitNOFILE=1000000')
+                }
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+end