151 lines
3.9 KiB
Ruby
151 lines
3.9 KiB
Ruby
require 'spec_helper'
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describe Gitlab::Metrics::Sampler do
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let(:sampler) { described_class.new(5) }
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after do
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Allocations.stop if Gitlab::Metrics.mri?
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end
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describe '#start' do
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it 'gathers a sample at a given interval' do
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expect(sampler).to receive(:sleep).with(a_kind_of(Numeric))
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expect(sampler).to receive(:sample)
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expect(sampler).to receive(:loop).and_yield
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sampler.start.join
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end
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end
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describe '#sample' do
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it 'samples various statistics' do
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expect(sampler).to receive(:sample_memory_usage)
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expect(sampler).to receive(:sample_file_descriptors)
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expect(sampler).to receive(:sample_objects)
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expect(sampler).to receive(:sample_gc)
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expect(sampler).to receive(:flush)
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sampler.sample
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end
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it 'clears any GC profiles' do
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expect(sampler).to receive(:flush)
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expect(GC::Profiler).to receive(:clear)
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sampler.sample
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end
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end
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describe '#flush' do
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it 'schedules the metrics using Sidekiq' do
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expect(Gitlab::Metrics).to receive(:submit_metrics).
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with([an_instance_of(Hash)])
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sampler.sample_memory_usage
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sampler.flush
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end
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end
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describe '#sample_memory_usage' do
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it 'adds a metric containing the memory usage' do
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expect(Gitlab::Metrics::System).to receive(:memory_usage).
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and_return(9000)
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expect(sampler).to receive(:add_metric).
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with(/memory_usage/, value: 9000).
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and_call_original
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sampler.sample_memory_usage
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end
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end
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describe '#sample_file_descriptors' do
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it 'adds a metric containing the amount of open file descriptors' do
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expect(Gitlab::Metrics::System).to receive(:file_descriptor_count).
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and_return(4)
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expect(sampler).to receive(:add_metric).
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with(/file_descriptors/, value: 4).
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and_call_original
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sampler.sample_file_descriptors
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end
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end
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if Gitlab::Metrics.mri?
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describe '#sample_objects' do
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it 'adds a metric containing the amount of allocated objects' do
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expect(sampler).to receive(:add_metric).
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with(/object_counts/, an_instance_of(Hash), an_instance_of(Hash)).
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at_least(:once).
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and_call_original
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sampler.sample_objects
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end
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it 'ignores classes without a name' do
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expect(Allocations).to receive(:to_hash).and_return({ Class.new => 4 })
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expect(sampler).not_to receive(:add_metric).
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with('object_counts', an_instance_of(Hash), type: nil)
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sampler.sample_objects
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end
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end
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end
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describe '#sample_gc' do
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it 'adds a metric containing garbage collection statistics' do
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expect(GC::Profiler).to receive(:total_time).and_return(0.24)
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expect(sampler).to receive(:add_metric).
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with(/gc_statistics/, an_instance_of(Hash)).
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and_call_original
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sampler.sample_gc
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end
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end
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describe '#add_metric' do
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it 'prefixes the series name for a Rails process' do
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expect(sampler).to receive(:sidekiq?).and_return(false)
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expect(Gitlab::Metrics::Metric).to receive(:new).
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with('rails_cats', { value: 10 }, {}).
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and_call_original
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sampler.add_metric('cats', value: 10)
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end
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it 'prefixes the series name for a Sidekiq process' do
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expect(sampler).to receive(:sidekiq?).and_return(true)
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expect(Gitlab::Metrics::Metric).to receive(:new).
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with('sidekiq_cats', { value: 10 }, {}).
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and_call_original
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sampler.add_metric('cats', value: 10)
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end
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end
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describe '#sleep_interval' do
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it 'returns a Numeric' do
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expect(sampler.sleep_interval).to be_a_kind_of(Numeric)
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end
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# Testing random behaviour is very hard, so treat this test as a basic smoke
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# test instead of a very accurate behaviour/unit test.
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it 'does not return the same interval twice in a row' do
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last = nil
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100.times do
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interval = sampler.sleep_interval
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expect(interval).not_to eq(last)
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last = interval
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end
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end
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end
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end
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