require 'spec_helper' describe Gitlab::Metrics do describe '.settings' do it 'returns a Hash' do expect(described_class.settings).to be_an_instance_of(Hash) end end describe '.enabled?' do it 'returns a boolean' do expect([true, false].include?(described_class.enabled?)).to eq(true) end end describe '.submit_metrics' do it 'prepares and writes the metrics to InfluxDB' do connection = double(:connection) pool = double(:pool) expect(pool).to receive(:with).and_yield(connection) expect(connection).to receive(:write_points).with(an_instance_of(Array)) expect(described_class).to receive(:pool).and_return(pool) described_class.submit_metrics([{ 'series' => 'kittens', 'tags' => {} }]) end end describe '.prepare_metrics' do it 'returns a Hash with the keys as Symbols' do metrics = described_class. prepare_metrics([{ 'values' => {}, 'tags' => {} }]) expect(metrics).to eq([{ values: {}, tags: {} }]) end it 'escapes tag values' do metrics = described_class.prepare_metrics([ { 'values' => {}, 'tags' => { 'foo' => 'bar=' } } ]) expect(metrics).to eq([{ values: {}, tags: { 'foo' => 'bar\\=' } }]) end it 'drops empty tags' do metrics = described_class.prepare_metrics([ { 'values' => {}, 'tags' => { 'cats' => '', 'dogs' => nil } } ]) expect(metrics).to eq([{ values: {}, tags: {} }]) end end describe '.escape_value' do it 'escapes an equals sign' do expect(described_class.escape_value('foo=')).to eq('foo\\=') end it 'casts values to Strings' do expect(described_class.escape_value(10)).to eq('10') end end describe '.measure' do context 'without a transaction' do it 'returns the return value of the block' do val = described_class.measure(:foo) { 10 } expect(val).to eq(10) end end context 'with a transaction' do let(:transaction) { Gitlab::Metrics::Transaction.new } before do allow(described_class).to receive(:current_transaction). and_return(transaction) end it 'adds a metric to the current transaction' do expect(transaction).to receive(:increment). with('foo_real_time', a_kind_of(Numeric)) expect(transaction).to receive(:increment). with('foo_cpu_time', a_kind_of(Numeric)) expect(transaction).to receive(:increment). with('foo_call_count', 1) described_class.measure(:foo) { 10 } end it 'returns the return value of the block' do val = described_class.measure(:foo) { 10 } expect(val).to eq(10) end end end describe '.tag_transaction' do context 'without a transaction' do it 'does nothing' do expect_any_instance_of(Gitlab::Metrics::Transaction). not_to receive(:add_tag) described_class.tag_transaction(:foo, 'bar') end end context 'with a transaction' do let(:transaction) { Gitlab::Metrics::Transaction.new } it 'adds the tag to the transaction' do expect(described_class).to receive(:current_transaction). and_return(transaction) expect(transaction).to receive(:add_tag). with(:foo, 'bar') described_class.tag_transaction(:foo, 'bar') end end end describe '.action=' do context 'without a transaction' do it 'does nothing' do expect_any_instance_of(Gitlab::Metrics::Transaction). not_to receive(:action=) described_class.action = 'foo' end end context 'with a transaction' do it 'sets the action of a transaction' do trans = Gitlab::Metrics::Transaction.new expect(described_class).to receive(:current_transaction). and_return(trans) expect(trans).to receive(:action=).with('foo') described_class.action = 'foo' end end end describe '#series_prefix' do it 'returns a String' do expect(described_class.series_prefix).to be_an_instance_of(String) end end describe '.add_event' do context 'without a transaction' do it 'does nothing' do expect_any_instance_of(Gitlab::Metrics::Transaction). not_to receive(:add_event) described_class.add_event(:meow) end end context 'with a transaction' do it 'adds an event' do transaction = Gitlab::Metrics::Transaction.new expect(transaction).to receive(:add_event).with(:meow) expect(described_class).to receive(:current_transaction). and_return(transaction) described_class.add_event(:meow) end end end end