81 lines
2.5 KiB
Ruby
81 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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require 'fast_spec_helper'
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require_relative '../../metrics_server/metrics_server'
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require_relative '../support/helpers/next_instance_of'
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RSpec.describe MetricsServer do # rubocop:disable RSpec/FilePath
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include NextInstanceOf
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describe '.spawn' do
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let(:env) do
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{
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'METRICS_SERVER_TARGET' => 'sidekiq',
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'GITLAB_CONFIG' => nil
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}
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end
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it 'spawns a process with the correct environment variables and detaches it' do
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expect(Process).to receive(:spawn).with(env, anything, err: $stderr, out: $stdout).and_return(99)
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expect(Process).to receive(:detach).with(99)
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described_class.spawn('sidekiq')
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end
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end
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describe '#start' do
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let(:exporter_class) { Class.new(Gitlab::Metrics::Exporter::BaseExporter) }
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let(:exporter_double) { double('fake_exporter', start: true) }
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let(:prometheus_client_double) { double(::Prometheus::Client) }
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let(:prometheus_config) { ::Prometheus::Client::Configuration.new }
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let(:metrics_dir) { Dir.mktmpdir }
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let(:settings_double) { double(:settings, sidekiq_exporter: {}) }
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subject(:metrics_server) { described_class.new('fake', metrics_dir)}
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before do
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stub_env('prometheus_multiproc_dir', metrics_dir)
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stub_const('Gitlab::Metrics::Exporter::FakeExporter', exporter_class)
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allow(exporter_class).to receive(:instance).with({}, synchronous: true).and_return(exporter_double)
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allow(Settings).to receive(:monitoring).and_return(settings_double)
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end
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after do
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Dir.rmdir(metrics_dir)
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end
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it 'configures ::Prometheus::Client' do
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allow(prometheus_client_double).to receive(:configuration).and_return(prometheus_config)
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metrics_server.start
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expect(prometheus_config.multiprocess_files_dir).to eq metrics_dir
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end
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it 'ensures that metrics directory exists in correct mode (0700)' do
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expect(FileUtils).to receive(:mkdir_p).with(metrics_dir, mode: 0700)
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metrics_server.start
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end
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it 'removes any old metrics files' do
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FileUtils.touch("#{metrics_dir}/remove_this.db")
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expect { metrics_server.start }.to change { Dir.empty?(metrics_dir) }.from(false).to(true)
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end
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it 'starts a metrics server' do
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expect(exporter_double).to receive(:start)
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metrics_server.start
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end
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it 'sends the correct Settings to the exporter instance' do
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expect(Settings).to receive(:monitoring).and_return(settings_double)
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expect(settings_double).to receive(:sidekiq_exporter)
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metrics_server.start
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end
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end
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end
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