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require 'spec_helper'
describe Gitlab::Metrics::Instrumentation do
let(:transaction) { Gitlab::Metrics::Transaction.new }
before do
@dummy = Class.new do
def self.foo(text = 'foo')
text
end
def bar(text = 'bar')
text
end
end
allow(@dummy).to receive(:name).and_return('Dummy')
end
describe '.configure' do
it 'yields self' do
described_class.configure do |c|
expect(c).to eq(described_class)
end
end
end
describe '.instrument_method' do
describe 'with metrics enabled' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(true)
described_class.instrument_method(@dummy, :foo)
end
it 'renames the original method' do
expect(@dummy).to respond_to(:_original_foo)
end
it 'calls the instrumented method with the correct arguments' do
expect(@dummy.foo).to eq('foo')
end
it 'tracks the call duration upon calling the method' do
allow(Gitlab::Metrics).to receive(:method_call_threshold).
and_return(0)
allow(described_class).to receive(:transaction).
and_return(transaction)
expect(transaction).to receive(:add_metric).
with(described_class::SERIES, an_instance_of(Hash),
method: 'Dummy.foo')
@dummy.foo
end
it 'does not track method calls below a given duration threshold' do
allow(Gitlab::Metrics).to receive(:method_call_threshold).
and_return(100)
expect(transaction).to_not receive(:add_metric)
@dummy.foo
end
end
describe 'with metrics disabled' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(false)
end
it 'does not instrument the method' do
described_class.instrument_method(@dummy, :foo)
expect(@dummy).to_not respond_to(:_original_foo)
end
end
end
describe '.instrument_instance_method' do
describe 'with metrics enabled' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(true)
described_class.
instrument_instance_method(@dummy, :bar)
end
it 'renames the original method' do
expect(@dummy.method_defined?(:_original_bar)).to eq(true)
end
it 'calls the instrumented method with the correct arguments' do
expect(@dummy.new.bar).to eq('bar')
end
it 'tracks the call duration upon calling the method' do
allow(Gitlab::Metrics).to receive(:method_call_threshold).
and_return(0)
allow(described_class).to receive(:transaction).
and_return(transaction)
expect(transaction).to receive(:add_metric).
with(described_class::SERIES, an_instance_of(Hash),
method: 'Dummy#bar')
@dummy.new.bar
end
it 'does not track method calls below a given duration threshold' do
allow(Gitlab::Metrics).to receive(:method_call_threshold).
and_return(100)
expect(transaction).to_not receive(:add_metric)
@dummy.new.bar
end
end
describe 'with metrics disabled' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(false)
end
it 'does not instrument the method' do
described_class.
instrument_instance_method(@dummy, :bar)
expect(@dummy.method_defined?(:_original_bar)).to eq(false)
end
end
end
describe '.instrument_class_hierarchy' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(true)
@child1 = Class.new(@dummy) do
def self.child1_foo; end
def child1_bar; end
end
@child2 = Class.new(@child1) do
def self.child2_foo; end
def child2_bar; end
end
end
it 'recursively instruments a class hierarchy' do
described_class.instrument_class_hierarchy(@dummy)
expect(@child1).to respond_to(:_original_child1_foo)
expect(@child2).to respond_to(:_original_child2_foo)
expect(@child1.method_defined?(:_original_child1_bar)).to eq(true)
expect(@child2.method_defined?(:_original_child2_bar)).to eq(true)
end
it 'does not instrument the root module' do
described_class.instrument_class_hierarchy(@dummy)
expect(@dummy).to_not respond_to(:_original_foo)
expect(@dummy.method_defined?(:_original_bar)).to eq(false)
end
end
describe '.instrument_methods' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(true)
end
it 'instruments all public class methods' do
described_class.instrument_methods(@dummy)
expect(@dummy).to respond_to(:_original_foo)
end
it 'only instruments methods directly defined in the module' do
mod = Module.new do
def kittens
end
end
@dummy.extend(mod)
described_class.instrument_methods(@dummy)
expect(@dummy).to_not respond_to(:_original_kittens)
end
it 'can take a block to determine if a method should be instrumented' do
described_class.instrument_methods(@dummy) do
false
end
expect(@dummy).to_not respond_to(:_original_foo)
end
end
describe '.instrument_instance_methods' do
before do
allow(Gitlab::Metrics).to receive(:enabled?).and_return(true)
end
it 'instruments all public instance methods' do
described_class.instrument_instance_methods(@dummy)
expect(@dummy.method_defined?(:_original_bar)).to eq(true)
end
it 'only instruments methods directly defined in the module' do
mod = Module.new do
def kittens
end
end
@dummy.include(mod)
described_class.instrument_instance_methods(@dummy)
expect(@dummy.method_defined?(:_original_kittens)).to eq(false)
end
it 'can take a block to determine if a method should be instrumented' do
described_class.instrument_instance_methods(@dummy) do
false
end
expect(@dummy.method_defined?(:_original_bar)).to eq(false)
end
end
end
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