ruby / ruby/prettyprint

prettyprint.rb:180:in text': undefined method length' for nil:NilClass (NoMethodError)

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Description

Hello,

I was reporting an issue with the dnsruby library and was referred here. https://github.com/alexdalitz/dnsruby/issues/183

Hello,

I wanted to write a small script with Ruby that does zonewalking. For this I set dnssec to true and set the authoitive nameserver because it allows "ANY" requests. After that I wanted to print the result with pp and got an error.

require "dnsruby"

resolver = Dnsruby::Resolver.new
resolver.nameserver = "ns1.he.net"
resolver.dnssec = true

pp resolver.query("walking.zonewalking.de", "ANY").answer

[#<Dnsruby::RR::IN::A:0x00007f06ddb4c928
  @address=#<Dnsruby::IPv4 5.45.109.122>,
  @klass=IN,
  @name=#<Dnsruby::Name: walking.zonewalking.de.>,
  @rdata=#<Dnsruby::IPv4 5.45.109.122>,
  @ttl=10800,
  @type=A>,
 #<Dnsruby::RR::IN::RRSIG:0x00007f06ddb50870/home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:180:in `text': undefined method `length' for nil:NilClass (NoMethodError)

  def text(obj, width=obj.length)
                         ^^^^^^^
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:324:in `pretty_print'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:197:in `block in pp'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:253:in `block (2 levels) in group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:280:in `nest'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:252:in `block in group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:265:in `group_sub'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:251:in `group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:197:in `pp'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:274:in `block (3 levels) in pp_object'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:253:in `block (2 levels) in group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:280:in `nest'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:252:in `block in group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:265:in `group_sub'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:251:in `group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:272:in `block (2 levels) in pp_object'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:260:in `block in seplist'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:254:in `each'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:254:in `seplist'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:267:in `block in pp_object'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:253:in `block (2 levels) in group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:280:in `nest'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:252:in `block in group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:265:in `group_sub'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:251:in `group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:215:in `object_address_group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:266:in `pp_object'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:328:in `pretty_print'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:197:in `block in pp'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:253:in `block (2 levels) in group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:280:in `nest'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:252:in `block in group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:265:in `group_sub'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:251:in `group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:197:in `pp'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:369:in `block (2 levels) in pretty_print'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:260:in `block in seplist'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:254:in `each'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:254:in `seplist'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:368:in `block in pretty_print'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:253:in `block (2 levels) in group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:280:in `nest'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:252:in `block in group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:265:in `group_sub'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:251:in `group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:367:in `pretty_print'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:197:in `block in pp'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:253:in `block (2 levels) in group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:280:in `nest'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:252:in `block in group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:265:in `group_sub'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/prettyprint.rb:251:in `group'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:197:in `pp'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:93:in `block in pp'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:154:in `guard_inspect_key'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:93:in `pp'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:626:in `block in pp'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:625:in `each'
	from /home/marek/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/pp.rb:625:in `pp'
	from <internal:prelude>:15:in `pp'
	from walk.rb:8:in `<main>'

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Run the reproducer from walk.rb:8 and trace the failure through pp.rb to prettyprint.rb:180. Determine why the DNS response causes pretty printing to call text with nil, then verify that the same script prints the answer without raising NoMethodError.

Written by the indexing model from the issue text.

Assessment

Tech stack
ruby
Domain
tooling
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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