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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Metrics::Samplers::PumaSampler do
subject { described_class.new }
let(:null_metric) { double('null_metric', set: nil, observe: nil) }
before do
allow(Gitlab::Metrics::NullMetric).to receive(:instance).and_return(null_metric)
end
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
expect(subject).to receive(:puma_stats).and_return(puma_stats)
end
context 'in cluster mode' do
let(:puma_stats) do
<<~EOS
{
"workers": 2,
"phase": 2,
"booted_workers": 2,
"old_workers": 0,
"worker_status": [{
"pid": 32534,
"index": 0,
"phase": 1,
"booted": true,
"last_checkin": "2019-05-15T07:57:55Z",
"last_status": {
"backlog":0,
"running":1,
"pool_capacity":4,
"max_threads": 4
}
}]
}
EOS
end
it 'samples master statistics' do
labels = { worker: 'master' }
expect(subject.metrics[:puma_workers]).to receive(:set).with(labels, 2)
expect(subject.metrics[:puma_running_workers]).to receive(:set).with(labels, 2)
expect(subject.metrics[:puma_stale_workers]).to receive(:set).with(labels, 0)
subject.sample
end
it 'samples worker statistics' do
labels = { worker: 'worker_0' }
expect_worker_stats(labels)
subject.sample
end
end
context 'with empty worker stats' do
let(:puma_stats) do
<<~EOS
{
"workers": 2,
"phase": 2,
"booted_workers": 2,
"old_workers": 0,
"worker_status": [{
"pid": 32534,
"index": 0,
"phase": 1,
"booted": true,
"last_checkin": "2019-05-15T07:57:55Z",
"last_status": {}
}]
}
EOS
end
it 'does not log worker stats' do
expect(subject).not_to receive(:set_worker_metrics)
subject.sample
end
end
context 'in single mode' do
let(:puma_stats) do
<<~EOS
{
"backlog":0,
"running":1,
"pool_capacity":4,
"max_threads": 4
}
EOS
end
it 'samples worker statistics' do
labels = {}
expect(subject.metrics[:puma_workers]).to receive(:set).with(labels, 1)
expect(subject.metrics[:puma_running_workers]).to receive(:set).with(labels, 1)
expect_worker_stats(labels)
subject.sample
end
end
end
def expect_worker_stats(labels)
expect(subject.metrics[:puma_queued_connections]).to receive(:set).with(labels, 0)
expect(subject.metrics[:puma_active_connections]).to receive(:set).with(labels, 0)
expect(subject.metrics[:puma_running]).to receive(:set).with(labels, 1)
expect(subject.metrics[:puma_pool_capacity]).to receive(:set).with(labels, 4)
expect(subject.metrics[:puma_max_threads]).to receive(:set).with(labels, 4)
expect(subject.metrics[:puma_idle_threads]).to receive(:set).with(labels, 1)
end
end
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