Add postgresql module

manifests/module/postgresql.pp

@@ -0,0 +1,33 @@
+# filebeat::module::postgresql
+#
+# @summary
+#   This class manages the Filebeat module for PostgreSQL.
+#
+# @example
+#   class { 'filebeat::module::postgresql':
+#     log_enabled => true,
+#     log_paths   => [
+#       '/var/log/postgresql/*.log',
+#     ],
+#   }
+#
+# @param log_enabled
+#   Whether to enable the PostgreSQL module.
+# @param log_paths
+#   An array of absolute paths to the PostgreSQL log files.
+#
+class filebeat::module::postgresql (
+  Boolean $log_enabled = false,
+  Optional[Array[Stdlib::Absolutepath]] $log_paths = undef,
+) {
+  filebeat::module { 'postgresql':
+    config => {
+      'log' => delete_undef_values(
+        {
+          'enabled'   => $log_enabled,
+          'var.paths' => $log_paths,
+        }
+      ),
+    },
+  }
+}

spec/classes/module/postgresql_spec.rb

@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'filebeat::module::postgresql' do
+  let :pre_condition do
+    'include ::filebeat'
+  end
+
+  let(:facts) { 
+    {
+      :kernel => 'Linux',
+      :os => {
+        :family => 'Debian',
+        :name => 'Ubuntu',
+      }
+    } 
+  }
+
+  context 'on default values' do
+    it { is_expected.to compile.with_all_deps }
+
+    it {
+      is_expected.to contain_file('filebeat-module-postgresql').with_content(
+      %r{- module: postgresql\n\s{2}log:\n\s{4}enabled: false\n\n},
+    )}
+  end
+
+  context 'on log enabled with paths' do
+    let(:params) do
+      {
+        'log_enabled' => true,
+        'log_paths' => ['/var/log/postgresql.log'],
+      }
+    end
+
+    it { is_expected.to compile.with_all_deps }
+
+    it {
+      is_expected.to contain_file('filebeat-module-postgresql').with_content(
+        <<-EOS
+### Filebeat configuration managed by Puppet ###
+---
+- module: postgresql
+  log:
+    enabled: true
+    var.paths:
+    - "/var/log/postgresql.log"
+
+EOS
+    )
+    }
+  end
+end