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pipeline-info: increase safety of transforming stats (#13345) (#13850)

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When a pipeline isn't fully initialized, we run the risk of attempting to
format pipeline info that isn't yet fully-shaped. By using safe-fallback
methods like `Hash#dig` and conditional-chaining, we can avoid the spurious
`NoMethodError` caused by sending `[]` to nil.

(cherry picked from commit e9455ca81e)
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Ry Biesemeyer 2022-03-07 11:02:18 -08:00 • committed by GitHub
parent f0fa13d188
commit 5d0ad6ea38
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logstash-core/lib/logstash/config/pipelines_info.rb
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@ -21,9 +21,9 @@ module LogStash; module Config;
# It is important that we iterate via the agent's pipelines vs. the
# metrics pipelines. This prevents race conditions as pipeline stats may be
# populated before the agent has it in its own pipelines state
stats = metric_store.get_with_path("/stats/pipelines")[:stats][:pipelines]
stats = metric_store.get_with_path("/stats/pipelines").dig(:stats, :pipelines) || {}
agent.running_pipelines.map do |pipeline_id, pipeline|
p_stats = stats[pipeline_id]
p_stats = stats.fetch(pipeline_id) { Hash.new }
# Don't record stats for system pipelines
next nil if pipeline.system?
# Don't emit stats for pipelines that have not yet registered any metrics