how do I check to see whether a hash value is defined if a parent of the hash value might not even exist?

[Steve Neuharth]

I've got a big hash of info that looks like this:

  $web_conf = {
    my_client => {
      dev => {
        ws => {
          server_name => 'ws.foo.bar',
          server_aliases => ['ws.dev.bar.foo.com', 'ws.dev.another.foo.com'],
        },
        csr => {
          server_aliases => ['csr.dev.bar.foo.com', 'csr.dev.another.foo.com'],
        },
        mw => {
          server_aliases => ['mw.dev.bar.foo.com', 'mw.dev.another.foo.com'],
        },
      },
    }

I'm trying to do something like this in my manifest:

  # set up our servername
  if $web_conf[$::client][$::env][$name]['server_name'] {
    $server_name = $web_conf[$::client][$::env][$name]['server_name']
  } else {
    $server_name = "${name}.${client_code}.${::env}.${domain}"
  }

The thought was that I'd have servers that follow a certain naming convention and ones that don't. The ones that have 'special' names go in the web_conf hash. If the manifest 'sees' a server name in the hash, it should use that. If not, then it just does the 'else' bit.

The trouble is that it totally fails if even the top or intermediate levels of the hash don't exist. I've tried using "if $web_conf[$::client][$::env][$name]['server_name'] != undef", tried "if undef($web_conf[$::client][$::env][$name]['server_name'])" etc.

what's the correct way to do this?
--steve 

[Steve Neuharth]

this works:

  # set up our servername

  if $web_conf[$::client] {
    if $web_conf[$::client][$::env] {
      if $web_conf[$::client][$::env][$name] {

        if $web_conf[$::client][$::env][$name]['server_name'] {
          $server_name = $web_conf[$::client][$::env][$name]['server_name']
        } else {
          $server_name = "${name}.${client_code}.${::env}.${domain}"
        }
      } else {
        $server_name = "${name}.${client_code}.${::env}.${domain}"
      }
    } else {
      $server_name = "${name}.${client_code}.${::env}.${domain}"
    }
  } else {
    $server_name = "${name}.${client_code}.${::env}.${domain}"
  }

but it's SO UGLY. Any recommendations on making it prettier?

[David Schmitt]

What about using hiera:

data.yaml:
---
client::dev::sw::server_name: ws.foo.bar

pp:
$server_name =
hiera("client::${::client}::${::env}::${name}::server_name", "default
value")

Regards, David

On 2014-03-11 16:34, Steve Neuharth wrote:
> this works:
>
> # set up our servername
> if $web_conf[$::client] {
> if $web_conf[$::client][$::env] {
> if $web_conf[$::client][$::env][$name] {
> if $web_conf[$::client][$::env][$name]['server_name'] {
> $server_name = $web_conf[$::client][$::env][$name]['server_name']
> } else {
> $server_name = "${name}.${client_code}.${::env}.${domain}"
> }
> } else {
> $server_name = "${name}.${client_code}.${::env}.${domain}"
> }
> } else {
> $server_name = "${name}.${client_code}.${::env}.${domain}"
> }
> } else {
> $server_name = "${name}.${client_code}.${::env}.${domain}"
> }
>
> but it's SO UGLY. Any recommendations on making it prettier?
>
> On Monday, March 10, 2014 3:42:36 PM UTC-5, Steve Neuharth wrote:
>
>> I've got a big hash of info that looks like this:
>>
>> $web_conf = {
>> my_client => {
>> dev => {
>> ws => {
>> server_name => 'ws.foo.bar',

>> server_aliases => ['ws.dev.bar.foo.com [1]',
>> 'ws.dev.another.foo.com [2]'],
>> },
>> csr => {
>> server_aliases => ['csr.dev.bar.foo.com [3]',
>> 'csr.dev.another.foo.com [4]'],
>> },
>> mw => {
>> server_aliases => ['mw.dev.bar.foo.com [5]',
>> 'mw.dev.another.foo.com [6]'],

>> },
>> },
>> }
>>
>> I'm trying to do something like this in my manifest:
>>
>> # set up our servername
>> if $web_conf[$::client][$::env][$name]['server_name'] {
>> $server_name = $web_conf[$::client][$::env][$name]['server_name']
>> } else {
>> $server_name = "${name}.${client_code}.${::env}.${domain}"
>> }
>>
>> The thought was that I'd have servers that follow a certain naming
>> convention and ones that don't. The ones that have 'special' names
>> go in the web_conf hash. If the manifest 'sees' a server name in the
>> hash, it should use that. If not, then it just does the 'else' bit.
>>
>> The trouble is that it totally fails if even the top or intermediate
>> levels of the hash don't exist. I've tried using "if
>> $web_conf[$::client][$::env][$name]['server_name'] != undef", tried
>> "if undef($web_conf[$::client][$::env][$name]['server_name'])" etc.
>>
>> what's the correct way to do this?
>> --steve
>

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> [8].
> For more options, visit https://groups.google.com/d/optout [9].
>
>
> Links:
> ------
> [1]
>
> http://www.google.com/url?q75http%3A%2F%2Fws.dev.bar.foo.com46sa75D46sntz�75146usg75AFQjCNFmX6cyyTaccoxrdubRxxpiElZdiA
> [2]
>
> http://www.google.com/url?q75http%3A%2F%2Fws.dev.another.foo.com46sa75D46sntz�75146usg75AFQjCNH3NlITRPS_yRUnnGBU5opR17P7qw
> [3]
>
> http://www.google.com/url?q75http%3A%2F%2Fcsr.dev.bar.foo.com46sa75D46sntz�75146usg75AFQjCNFFDzU4C1eUsUjzElCeOoQ3wAfpDw
> [4]
>
> http://www.google.com/url?q75http%3A%2F%2Fcsr.dev.another.foo.com46sa75D46sntz�75146usg75AFQjCNGdGhCjs7JRYmkLXmT3Z194V2MkBw
> [5]
>
> http://www.google.com/url?q75http%3A%2F%2Fmw.dev.bar.foo.com46sa75D46sntz�75146usg75AFQjCNHrYg2mzHmEkTedOjOqvRgIOOiEdA
> [6]
>
> http://www.google.com/url?q75http%3A%2F%2Fmw.dev.another.foo.com46sa75D46sntz�75146usg75AFQjCNF0vYQdfXCDOt2znwABX_D1peMUvw
> [7] mailto:puppet-users...@googlegroups.com
> [8]
>
> https://groups.google.com/d/msgid/puppet-users/3355ea2c-0aae-436b-9098-d98a7de54dfb%40googlegroups.com?utm_medium=email&utm_source=footer
> [9] https://groups.google.com/d/optout

[Steve Neuharth]

very interesting. Maybe I need to just bite the bullet and use hiera.

> [7] mailto:puppet-users+unsub...@googlegroups.com

[Felix Frank]

Hi,

the puppetlabs-stdlib module introduces a has_key() function to puppet.

HTH,
Felix