109 lines
3.6 KiB
Ruby
109 lines
3.6 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
require 'fast_spec_helper'
|
|
|
|
require_relative '../../metrics_server/metrics_server'
|
|
require_relative '../support/helpers/next_instance_of'
|
|
|
|
RSpec.describe MetricsServer do # rubocop:disable RSpec/FilePath
|
|
include NextInstanceOf
|
|
|
|
before do
|
|
# We do not want this to have knock-on effects on the test process.
|
|
allow(Gitlab::ProcessManagement).to receive(:modify_signals)
|
|
end
|
|
|
|
describe '.spawn' do
|
|
context 'when in parent process' do
|
|
it 'forks into a new process and detaches it' do
|
|
expect(Process).to receive(:fork).and_return(99)
|
|
expect(Process).to receive(:detach).with(99)
|
|
|
|
described_class.spawn('sidekiq', metrics_dir: 'path/to/metrics')
|
|
end
|
|
end
|
|
|
|
context 'when in child process' do
|
|
before do
|
|
# This signals the process that it's "inside" the fork
|
|
expect(Process).to receive(:fork).and_return(nil)
|
|
expect(Process).not_to receive(:detach)
|
|
end
|
|
|
|
it 'starts the metrics server with the given arguments' do
|
|
expect_next_instance_of(MetricsServer) do |server|
|
|
expect(server).to receive(:start)
|
|
end
|
|
|
|
described_class.spawn('sidekiq', metrics_dir: 'path/to/metrics')
|
|
end
|
|
|
|
it 'resets signal handlers from parent process' do
|
|
expect(Gitlab::ProcessManagement).to receive(:modify_signals).with(%i[A B], 'DEFAULT')
|
|
|
|
described_class.spawn('sidekiq', metrics_dir: 'path/to/metrics', trapped_signals: %i[A B])
|
|
end
|
|
end
|
|
end
|
|
|
|
describe '#start' do
|
|
let(:exporter_class) { Class.new(Gitlab::Metrics::Exporter::BaseExporter) }
|
|
let(:exporter_double) { double('fake_exporter', start: true) }
|
|
let(:prometheus_config) { ::Prometheus::Client.configuration }
|
|
let(:metrics_dir) { Dir.mktmpdir }
|
|
let(:settings) { { "fake_exporter" => { "enabled" => true } } }
|
|
let!(:old_metrics_dir) { prometheus_config.multiprocess_files_dir }
|
|
|
|
subject(:metrics_server) { described_class.new('fake', metrics_dir, true)}
|
|
|
|
before do
|
|
stub_const('Gitlab::Metrics::Exporter::FakeExporter', exporter_class)
|
|
expect(exporter_class).to receive(:instance).with(settings['fake_exporter'], synchronous: true).and_return(exporter_double)
|
|
expect(Settings).to receive(:monitoring).and_return(settings)
|
|
end
|
|
|
|
after do
|
|
Gitlab::Metrics.reset_registry!
|
|
FileUtils.rm_rf(metrics_dir, secure: true)
|
|
prometheus_config.multiprocess_files_dir = old_metrics_dir
|
|
end
|
|
|
|
it 'configures ::Prometheus::Client' do
|
|
metrics_server.start
|
|
|
|
expect(prometheus_config.multiprocess_files_dir).to eq metrics_dir
|
|
end
|
|
|
|
it 'ensures that metrics directory exists in correct mode (0700)' do
|
|
expect(FileUtils).to receive(:mkdir_p).with(metrics_dir, mode: 0700)
|
|
|
|
metrics_server.start
|
|
end
|
|
|
|
context 'when wipe_metrics_dir is true' do
|
|
subject(:metrics_server) { described_class.new('fake', metrics_dir, true)}
|
|
|
|
it 'removes any old metrics files' do
|
|
FileUtils.touch("#{metrics_dir}/remove_this.db")
|
|
|
|
expect { metrics_server.start }.to change { Dir.empty?(metrics_dir) }.from(false).to(true)
|
|
end
|
|
end
|
|
|
|
context 'when wipe_metrics_dir is false' do
|
|
subject(:metrics_server) { described_class.new('fake', metrics_dir, false)}
|
|
|
|
it 'does not remove any old metrics files' do
|
|
FileUtils.touch("#{metrics_dir}/remove_this.db")
|
|
|
|
expect { metrics_server.start }.not_to change { Dir.empty?(metrics_dir) }.from(false)
|
|
end
|
|
end
|
|
|
|
it 'starts a metrics server' do
|
|
expect(exporter_double).to receive(:start)
|
|
|
|
metrics_server.start
|
|
end
|
|
end
|
|
end
|