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undefined method `flat_map' for nil:NilClass when conditional on an output

Fixed

Description

Using the following config + the latest code as of 9/19/14, this error is thrown when the output receives an event:

(eval):22:in `block in initialize': undefined method `flat_map' for nil:NilClass (NoMethodError)
from /media/truecrypt1/git/danielredoak/logstash/lib/logstash/pipeline.rb:272:in `call'
from /media/truecrypt1/git/danielredoak/logstash/lib/logstash/pipeline.rb:272:in `output'
from /media/truecrypt1/git/danielredoak/logstash/lib/logstash/pipeline.rb:231:in `outputworker'
from /media/truecrypt1/git/danielredoak/logstash/lib/logstash/pipeline.rb:160:in `block in start_outputs'

Config Ex:

input {
  file {
    path => "somefile"
  }
}

output {
  if [type] == "test" {
    stdout{}
  }
  file {
    path => "someoutput"
  }
}

Related file, code starts at 328:
https://github.com/elasticsearch/logstash/blob/4211522de1cf996891c6b93f93ba1ab4e408d587/lib/logstash/config/config_ast.rb#L328

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Details

Assignee

Colin Surprenant

Reporter

Ryan O'Keeffe

Fix versions

1.5.0 (next major)

Affects versions

1.5.0 (next major)

Created September 19, 2014 at 6:08 PM

Updated September 23, 2014 at 2:38 PM

Resolved September 23, 2014 at 2:38 PM

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Activity

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Colin Surprenant September 23, 2014 at 2:37 PM

merged in master!

Colin Surprenant September 23, 2014 at 12:51 PM

Confirmed. Thanks for the report! See https://github.com/elasticsearch/logstash/pull/1768

Will be merged in master shortly!

Ryan O'Keeffe September 19, 2014 at 6:21 PM
Edited

Looks like its related to the events local var not being set initially for the output_func in the compiled config.

http://pastebin.com/JJRWqi26

Related code starts at line 73: https://github.com/elasticsearch/logstash/blob/master/lib/logstash/config/config_ast.rb#L73

Perhaps the fix is to change this line to include "output" as well (or remove the conditional around it) but I don't have the experience with this code to really know for sure at this point. https://github.com/elasticsearch/logstash/blob/master/lib/logstash/config/config_ast.rb#L77-L79

["filter", "output"].each do |type|
        # defines @filter_func and @output_func

        definitions << "@#{type}_func = lambda do |event, &block|"
        if type == "filter"
          definitions << "  events = [event]"
        end
...

["filter", "output"].each do |type|
        # defines @filter_func and @output_func

        definitions << "@#{type}_func = lambda do |event, &block|"
        definitions << "  events = [event]"
...