# == Define: elasticsearch::service::init

#

# This class exists to coordinate all service management related actions,

# functionality and logical units in a central place.

#

# <b>Note:</b> "service" is the Puppet term and type for background processes

# in general and is used in a platform-independent way. E.g. "service" means

# "daemon" in relation to Unix-like systems.

#

#

# === Parameters

#

# [*ensure*]

#   String. Controls if the managed resources shall be <tt>present</tt> or

#   <tt>absent</tt>. If set to <tt>absent</tt>:

#   * The managed software packages are being uninstalled.

#   * Any traces of the packages will be purged as good as possible. This may

#     include existing configuration files. The exact behavior is provider

#     dependent. Q.v.:

#     * Puppet type reference: {package, "purgeable"}[http://j.mp/xbxmNP]

#     * {Puppet's package provider source code}[http://j.mp/wtVCaL]

#   * System modifications (if any) will be reverted as good as possible

#     (e.g. removal of created users, services, changed log settings, ...).

#   * This is thus destructive and should be used with care.

#   Defaults to <tt>present</tt>.

#

# [*status*]

#   String to define the status of the service. Possible values:

#   * <tt>enabled</tt>: Service is running and will be started at boot time.

#   * <tt>disabled</tt>: Service is stopped and will not be started at boot

#     time.

#   * <tt>running</tt>: Service is running but will not be started at boot time.

#     You can use this to start a service on the first Puppet run instead of

#     the system startup.

#   * <tt>unmanaged</tt>: Service will not be started at boot time and Puppet

#     does not care whether the service is running or not. For example, this may

#     be useful if a cluster management software is used to decide when to start

#     the service plus assuring it is running on the desired node.

#   Defaults to <tt>enabled</tt>. The singular form ("service") is used for the

#   sake of convenience. Of course, the defined status affects all services if

#   more than one is managed (see <tt>service.pp</tt> to check if this is the

#   case).

#

# [*init_defaults*]

#   Defaults file content in hash representation

#

# [*init_defaults_file*]

#   Defaults file as puppet resource

#

# [*init_template*]

#   Service file as a template

#

# === Authors

#

# * Richard Pijnenburg <mailto:richard.pijnenburg@elasticsearch.com>

#

define elasticsearch::service::init(

  $ensure             = $elasticsearch::ensure,

  $status             = $elasticsearch::status,

  $init_defaults_file = undef,

  $init_defaults      = undef,

  $init_template      = undef,

) {

  #### Service management

  # set params: in operation

  if $ensure == 'present' {

    case $status {

      # make sure service is currently running, start it on boot

      'enabled': {

        $service_ensure = 'running'

        $service_enable = true

      }

      # make sure service is currently stopped, do not start it on boot

      'disabled': {

        $service_ensure = 'stopped'

        $service_enable = false

      }

      # make sure service is currently running, do not start it on boot

      'running': {

        $service_ensure = 'running'

        $service_enable = false

      }

      # do not start service on boot, do not care whether currently running

      # or not

      'unmanaged': {

        $service_ensure = undef

        $service_enable = false

      }

      # unknown status

      # note: don't forget to update the parameter check in init.pp if you

      #       add a new or change an existing status.

      default: {

        fail("\"${status}\" is an unknown service status value")

      }

    }

  # set params: removal

  } else {

    # make sure the service is stopped and disabled (the removal itself will be

    # done by package.pp)

    $service_ensure = 'stopped'

    $service_enable = false

  }

  $notify_service = $elasticsearch::restart_config_change ? {

    true  => Service["elasticsearch-instance-${name}"],

    false => undef,

  }

  if ( $ensure == 'present' ) {

    # defaults file content. Either from a hash or file

    if ($init_defaults_file != undef) {

      file { "${elasticsearch::params::defaults_location}/elasticsearch-${name}":

        ensure => $ensure,

        source => $init_defaults_file,

        owner  => 'root',

        group  => '0',

        mode   => '0644',

        before => Service["elasticsearch-instance-${name}"],

        notify => $notify_service,

      }

    } else {

      if ($init_defaults != undef and is_hash($init_defaults) ) {

        if(has_key($init_defaults, 'ES_USER')) {

          if($init_defaults['ES_USER'] != $elasticsearch::elasticsearch_user) {

            fail('Found ES_USER setting for init_defaults but is not same as elasticsearch_user setting. Please use elasticsearch_user setting.')

          }

        }

      }

      $init_defaults_pre_hash = { 'ES_USER' => $elasticsearch::elasticsearch_user, 'ES_GROUP' => $elasticsearch::elasticsearch_group, 'MAX_OPEN_FILES' => '65535' }

      $new_init_defaults = merge($init_defaults_pre_hash, $init_defaults)

      augeas { "defaults_${name}":

        incl    => "${elasticsearch::params::defaults_location}/elasticsearch-${name}",

        lens    => 'Shellvars.lns',

        changes => template("${module_name}/etc/sysconfig/defaults.erb"),

        before  => Service["elasticsearch-instance-${name}"],

        notify  => $notify_service,

      }

    }

    # init file from template

    if ($init_template != undef) {

      file { "/etc/init.d/elasticsearch-${name}":

        ensure  => $ensure,

        content => template($init_template),

        owner   => 'root',

        group   => '0',

        mode    => '0755',

        before  => Service["elasticsearch-instance-${name}"],

        notify  => $notify_service,

      }

    }

  } else {

    file { "/etc/init.d/elasticsearch-${name}":

      ensure    => 'absent',

      subscribe => Service["elasticsearch-instance-${name}"],

    }

    file { "${elasticsearch::params::defaults_location}/elasticsearch-${name}":

      ensure    => 'absent',

      subscribe => Service["elasticsearch-${$name}"],

    }

  }

  # action

  service { "elasticsearch-instance-${name}":

    ensure     => $service_ensure,

    enable     => $service_enable,

    name       => "elasticsearch-${name}",

    hasstatus  => $elasticsearch::params::service_hasstatus,

    hasrestart => $elasticsearch::params::service_hasrestart,

    pattern    => $elasticsearch::params::service_pattern,

  }

}