Started working on this module

manifests/init.pp

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+# @summary
+# A puppet module to manage a system's Haproxy installation.
+#
+# @example
+#   class { 'haproxy':
+#     
+#   }
+class haproxy (
+  String[1] $package_ensure                                    = 'present',
+  String $package_name                                         = $haproxy::params::package_name,
+) inherits haproxy::params {
+  contain haproxy::install
+}

manifests/install.pp

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+# @summary Manages the state of the Haproxy package.
+#
+# This class will install the haproxy package is desired.
+#
+# @example
+#   include haproxy::install
+class haproxy::install {
+  package { $haproxy::package_name:
+    ensure => $haproxy::package_ensure,
+  }
+}

manifests/params.pp

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+# @summary Handles default parameters for Haproxy.
+#
+# This class is not intended to be called directly.
+#
+# @example
+#   include haproxy::params
+class haproxy::params {
+
+  case $::osfamily {
+    'Archlinux', 'Debian', 'Redhat', 'Gentoo', 'Suse', 'Linux' : {
+      $package_name      = 'haproxy'
+    }
+    'FreeBSD': {
+      $package_name      = 'haproxy'
+    }
+    default: { fail("The ${::osfamily} operating system is not supported with the haproxy module") }
+  }
+
+}