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How do I use validate_re to check integers?

asked 2013-09-25 04:09:09 -0500

robrwo gravatar image

I am passing port parameters to some custom resources, and would like to validate them as integers, using something like:

define foo(
  $port = 1000,
) {
  require stdlib
  validate_re($port, '^\d+$')


This works for the default value of $port, but whenever I specify a different value for the port, e.g.

foo( 'myfoo': port => 1001 }

it fails with a message that says the port parameter doesn't match the regex.

I don't understand why this is failing.

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Same code working fine on my machine. Try printing the $port parameter in the function itself using notify{"${port}":}, it may gives you any clue.

rahul khengare gravatar imagerahul khengare ( 2013-09-25 07:42:11 -0500 )edit

I've tried that. That's why I asked?

robrwo gravatar imagerobrwo ( 2013-09-26 05:34:24 -0500 )edit

And the notify spits out '1001'?

Ancillas gravatar imageAncillas ( 2013-10-19 00:10:01 -0500 )edit

@Ancillas: yes.

robrwo gravatar imagerobrwo ( 2013-10-21 08:32:13 -0500 )edit

I've noticed in the .erb templates that sometimes variables are integers, other times strings. So I'm thinking that may be what's going on with this.

robrwo gravatar imagerobrwo ( 2014-04-11 03:58:43 -0500 )edit

4 Answers

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answered 2013-09-26 01:55:02 -0500

golja gravatar image

updated 2013-10-21 09:17:29 -0500

Or you could use puppetlabs-stdlib is_integer function.

Example of a working code to clarify any doubt:

define foo ($port = 1000) {
  require stdlib
  if is_integer($port) {
    notice("all good integer value")
  else {
    fail("invalid value should be integer")

then if you execute puppet apply -e "foo {'bar': }" you should get:

Notice: Scope(Foo[bar]): all good integer value
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But how do I use is_integer to throw an error?

robrwo gravatar imagerobrwo ( 2013-09-26 05:34:53 -0500 )edit

Hmmm if ! is_integer($port) { fail("invalid ${port} value") }

golja gravatar imagegolja ( 2013-09-27 02:14:36 -0500 )edit

That does not work.

robrwo gravatar imagerobrwo ( 2013-10-10 04:12:27 -0500 )edit

with what error ?

golja gravatar imagegolja ( 2013-10-11 19:08:44 -0500 )edit

It fails with the message in fail.

robrwo gravatar imagerobrwo ( 2013-10-14 03:00:02 -0500 )edit

answered 2013-10-18 03:48:02 -0500

updated 2013-10-18 03:48:30 -0500

Just run into the same question, and ended up with this code:

if type($var) != 'integer' { fail("Not an integer) }

type is a function from stdlib, returning a string with the type of the variable.

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This is the only answer that works fine for me. Needs a closing double-quote though. The others all fail. Very strange.

Martijn Heemels gravatar imageMartijn Heemels ( 2013-11-06 06:50:22 -0500 )edit

answered 2013-10-21 05:35:37 -0500

Stdlib also has the is_numeric function which allows:

unless is_numeric($foo) {
  fail("Not an integer)
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As I've said above, this still fails with an error.

robrwo gravatar imagerobrwo ( 2013-10-21 08:31:26 -0500 )edit

I think I understand the problem: plain, unquoted integers fail, but if I give the integer as a string, it works. Is there a Puppet function for concercing integers into ...(more)

robrwo gravatar imagerobrwo ( 2014-02-26 11:35:25 -0500 )edit

To avoid these issues you should be quoting everything with the proper quotation marks, except boolean values and variables. That way everything is a string by default. The [Puppet Style ...(more)

daff gravatar imagedaff ( 2014-04-01 08:43:57 -0500 )edit

answered 2013-09-26 21:02:58 -0500

GregLarkin gravatar image

Can you pass the port parameter as a string argument to validate_re like so?

define foo(
  $port = 1000,
) {
  require stdlib
  validate_re("${port}", '^\d+$')


I don't know that it will change the behavior, but the validate_re documentation does say (emphasis mine):

Perform simple validation of a string against one or more regular expressions. The first argument of this function should be a string to test, and the second argument should be a stringified regular expression...

I'm not sure why the default value passes through correctly but other values do not. Please post back here with any updates. I'm ... (more)

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That doesn't work. I've also tried using if (!is_integer($port)) { fail "port must be an integer, not '${port}'" } and it still fails.

robrwo gravatar imagerobrwo ( 2013-10-09 11:44:29 -0500 )edit

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Asked: 2013-09-25 04:09:09 -0500

Seen: 5,388 times

Last updated: Oct 21 '13