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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Metrics::Samplers::ThreadsSampler do
subject { described_class.new }
describe '#interval' do
it 'samples every five seconds by default' do
expect(subject.interval).to eq(5)
end
it 'samples at other intervals if requested' do
expect(described_class.new(11).interval).to eq(11)
end
end
describe '#sample' do
before do
described_class::METRIC_DESCRIPTIONS.each_key do |metric|
allow(subject.metrics[metric]).to receive(:set)
end
end
it 'sets the gauge for the concurrency total' do
expect(Gitlab::Runtime).to receive(:max_threads).and_return(9000)
expect(subject.metrics[:max_expected_threads]).to receive(:set).with({}, 9000)
subject.sample
end
context 'thread counts' do
it 'reports if any of the threads per group uses the db' do
threads = [
fake_thread(described_class::SIDEKIQ_WORKER_THREAD_NAME, true), fake_thread(described_class::SIDEKIQ_WORKER_THREAD_NAME, false),
fake_thread(described_class::SIDEKIQ_WORKER_THREAD_NAME, nil)
]
allow(Thread).to receive(:list).and_return(threads)
expect(subject.metrics[:running_threads]).to receive(:set)
.with({ uses_db_connection: 'yes', thread_name: described_class::SIDEKIQ_WORKER_THREAD_NAME }, 1)
expect(subject.metrics[:running_threads]).to receive(:set)
.with({ uses_db_connection: 'no', thread_name: described_class::SIDEKIQ_WORKER_THREAD_NAME }, 2)
subject.sample
end
context 'thread names', :aggregate_failures do
where(:thread_names, :expected_names) do
[
[[nil], %w(unnamed)],
[['puma threadpool 1', 'puma threadpool 001', 'puma threadpool 002'], ['puma threadpool']],
[%w(sidekiq_worker_thread), %w(sidekiq_worker_thread)],
[%w(some_sampler some_exporter), %w(some_sampler some_exporter)],
[%w(unknown thing), %w(unrecognized)]
]
end
with_them do
it do
allow(Thread).to receive(:list).and_return(thread_names.map { |name| fake_thread(name) })
expected_names.each do |expected_name|
expect(subject.metrics[:running_threads]).to receive(:set)
.with({ uses_db_connection: 'yes', thread_name: expected_name }, instance_of(Integer))
expect(subject.metrics[:running_threads]).to receive(:set)
.with({ uses_db_connection: 'no', thread_name: expected_name }, instance_of(Integer))
end
subject.sample
end
end
end
end
def fake_thread(name = nil, db_connection = nil)
thready = { uses_db_connection: db_connection }
allow(thready).to receive(:name).and_return(name)
thready
end
end
end
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