syslog-ng.conf.erb

<%- if @comment -%>
### <%= @comment %>
<%- end -%>
<%= @type %> <% if @label %><%= @label %><% end %> {
<%- @config.sort.reverse.each do |key,value| -%>
  <%- if value.class == Array -%>
    <%- value.each do |element| -%>
  <%= key %>(<%= element %>);
    <%- end -%>
  <%- else -%>
  <%= key %>(<%= value %>);
  <%- end -%>
<%- end -%>
};

writer.pp

# Definition: syslog_ng::writer
#
# Description:
#   Generic file-writer library for syslog-ng. Used by other
#   classes to write out config files based on structured data.
#
# Parameters
#   $ensure  - Ensure the entry exists or not
#   $type    - Define the type of config block in syslog-ng (e.g.: source, filter, destination, log)
#   $config  - [Hash] Structured data for config. Takes Key/Value pairs, with Arrays and Strings
#              accepted as a value
#   $order   - Ordering used within `concat`
#   $comment - Extra comment added to each config
define syslog_ng::writer(
  $ensure  = present,
  $type    = undef,
  $config  = undef,
  $order   = '30',
  $comment = $name,
) {
  include stdlib

  validate_string($type, $order)
  validate_hash($config)

  $label = $type ? {
    /template/    => "t_${name}",
    /source/      => "s_${name}",
    /filter/      => "f_${name}",
    /destination/ => "d_${name}",
    default       => undef,
  }

  concat::fragment { $name:
    ensure  => $ensure,
    target  => '/etc/syslog-ng/syslog-ng.conf',
    order   => $order,
    content => template('syslog_ng/etc/syslog-ng/syslog-ng.conf.erb'),
  }
}