# == Define Resource Type: haproxy::listen
#
# This type will setup a listening service configuration block inside
#  the haproxy.cfg file on an haproxy load balancer. Each listening service
#  configuration needs one or more load balancer member server (that can be
#  declared with the haproxy::balancermember defined resource type). Using
#  storeconfigs, you can export the haproxy::balancermember resources on all
#  load balancer member servers, and then collect them on a single haproxy
#  load balancer server.
#
# === Requirement/Dependencies:
#
# Currently requires the ripienaar/concat module on the Puppet Forge and
#  uses storeconfigs on the Puppet Master to export/collect resources
#  from all balancer members.
#
# === Parameters
#
# [*name*]
#    The namevar of the defined resource type is the listening service's name.
#     This name goes right after the 'listen' statement in haproxy.cfg
#
# [*ports*]
#    Ports on which the proxy will listen for connections on the ip address
#    specified in the virtual_ip parameter. Accepts either a single
#    comma-separated string or an array of strings which may be ports or
#    hyphenated port ranges.
#
# [*ipaddress*]
#    The ip address the proxy binds to. Empty addresses, '*', and '0.0.0.0'
#     mean that the proxy listens to all valid addresses on the system.
#
# [*mode*]
#    The mode of operation for the listening service. Valid values are 'tcp',
#     HTTP', and 'health'.
#
# [*options*]
#    A hash of options that are inserted into the listening service
#     configuration block.
#
# [*collect_exported*]
#    Boolean, default 'true'. True means 'collect exported @@balancermember resources'
#    (for the case when every balancermember node exports itself), false means
#    'rely on the existing declared balancermember resources' (for the case when you 
#    know the full set of balancermembers in advance and use haproxy::balancermember 
#    with array arguments, which allows you to deploy everything in 1 run)
#
#
# === Examples
#
#  Exporting the resource for a balancer member:
#
#  haproxy::listen { 'puppet00':
#    ipaddress => $::ipaddress,
#    ports     => '18140',
#    mode      => 'tcp',
#    options   => {
#      'option'  => [
#        'tcplog',
#        'ssl-hello-chk'
#      ],
#      'balance' => 'roundrobin'
#    },
#  }
#
# === Authors
#
# Gary Larizza <gary@puppetlabs.com>
#
define haproxy::listen (
  $ports,
  $ipaddress        = [$::ipaddress],
  $mode             = 'tcp',
  $collect_exported = true,
  $options          = {
    'option'  => [
      'tcplog',
      'ssl-hello-chk'
    ],
    'balance' => 'roundrobin'
  }
) {
  # Template uses: $name, $ipaddress, $ports, $options
  concat::fragment { "${name}_listen_block":
    order   => "20-${name}-00",
    target  => '/etc/haproxy/haproxy.cfg',
    content => template('haproxy/haproxy_listen_block.erb'),
  }

  if $collect_exported {
    Haproxy::Balancermember <<| listening_service == $name |>>
  }
  # else: the resources have been created and they introduced their
  # concat fragments. We don't have to do anything about them.
}