debian-mirror-gitlab/spec/lib/gitlab/profiler_spec.rb
2021-09-04 01:27:46 +05:30

240 lines
7.7 KiB
Ruby

# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Profiler do
let(:null_logger) { Logger.new('/dev/null') }
let(:private_token) { 'private' }
describe '.profile' do
let(:app) { double(:app) }
before do
allow(ActionDispatch::Integration::Session).to receive(:new).and_return(app)
allow(app).to receive(:get)
end
it 'returns a profile result' do
expect(described_class.profile('/')).to be_an_instance_of(RubyProf::Profile)
end
it 'uses the custom logger given' do
expect(described_class).to receive(:create_custom_logger)
.with(null_logger, private_token: anything)
.and_call_original
described_class.profile('/', logger: null_logger)
end
it 'sends a POST request when data is passed' do
post_data = '{"a":1}'
expect(app).to receive(:post).with(anything, params: post_data, headers: anything)
described_class.profile('/', post_data: post_data)
end
it 'uses the private_token for auth if given' do
expect(app).to receive(:get).with('/', params: nil, headers: { 'Private-Token' => private_token })
expect(app).to receive(:get).with('/api/v4/users')
described_class.profile('/', private_token: private_token)
end
it 'uses the user for auth if given' do
user = double(:user)
expect(described_class).to receive(:with_user).with(user)
described_class.profile('/', user: user)
end
it 'uses the private_token for auth if both it and user are set' do
user = double(:user)
expect(described_class).to receive(:with_user).with(nil).and_call_original
expect(app).to receive(:get).with('/', params: nil, headers: { 'Private-Token' => private_token })
expect(app).to receive(:get).with('/api/v4/users')
described_class.profile('/', user: user, private_token: private_token)
end
end
describe '.create_custom_logger' do
it 'does nothing when nil is passed' do
expect(described_class.create_custom_logger(nil)).to be_nil
end
context 'the new logger' do
let(:custom_logger) do
described_class.create_custom_logger(null_logger, private_token: private_token)
end
it 'does not affect the existing logger' do
expect(null_logger).not_to receive(:debug)
expect(custom_logger).to receive(:debug).and_call_original
custom_logger.debug('Foo')
end
it 'strips out the private token' do
allow(custom_logger).to receive(:add).and_call_original
expect(custom_logger).to receive(:add).with(Logger::DEBUG, anything, 'public [FILTERED]').at_least(1)
custom_logger.debug("public #{private_token}")
end
it 'tracks model load times by model' do
custom_logger.debug('This is not a model load')
custom_logger.debug('User Load (1.2ms)')
custom_logger.debug('User Load (1.3ms)')
custom_logger.debug('Project Load (10.4ms)')
expect(custom_logger.load_times_by_model).to eq('User' => [1.2, 1.3],
'Project' => [10.4])
end
it 'logs the backtrace, ignoring lines as appropriate' do
# Skip Rails's backtrace cleaning.
allow(Rails.backtrace_cleaner).to receive(:clean, &:itself)
expect(custom_logger).to receive(:add)
.with(Logger::DEBUG,
anything,
a_string_matching(File.basename(__FILE__)))
.twice
expect(custom_logger).not_to receive(:add).with(Logger::DEBUG,
anything,
a_string_matching('lib/gitlab/profiler.rb'))
# Force a part of the backtrace to be in the (ignored) profiler source
# file.
described_class.with_custom_logger(nil) { custom_logger.debug('Foo') }
end
end
end
describe '.with_custom_logger' do
context 'when the logger is set' do
it 'uses the replacement logger for the duration of the block' do
expect(null_logger).to receive(:debug).and_call_original
expect { described_class.with_custom_logger(null_logger) { ActiveRecord::Base.logger.debug('foo') } }
.to not_change { ActiveRecord::Base.logger }
.and not_change { ActionController::Base.logger }
.and not_change { ActiveSupport::LogSubscriber.colorize_logging }
end
it 'returns the result of the block' do
expect(described_class.with_custom_logger(null_logger) { 2 }).to eq(2)
end
end
context 'when the logger is nil' do
it 'returns the result of the block' do
expect(described_class.with_custom_logger(nil) { 2 }).to eq(2)
end
it 'does not modify the standard Rails loggers' do
expect { described_class.with_custom_logger(nil) {} }
.to not_change { ActiveRecord::Base.logger }
.and not_change { ActionController::Base.logger }
.and not_change { ActiveSupport::LogSubscriber.colorize_logging }
end
end
end
describe '.with_user' do
context 'when the user is set' do
let(:user) { double(:user) }
it 'overrides auth in ApplicationController to use the given user' do
expect(described_class.with_user(user) { ApplicationController.new.current_user }).to eq(user)
end
it 'cleans up ApplicationController afterwards' do
expect { described_class.with_user(user) {} }
.to not_change { ActionController.instance_methods(false) }
end
end
context 'when the user is nil' do
it 'does not define methods on ApplicationController' do
expect(ApplicationController).not_to receive(:define_method)
described_class.with_user(nil) {}
end
end
end
describe '.log_load_times_by_model' do
it 'logs the model, query count, and time by slowest first' do
expect(null_logger).to receive(:load_times_by_model).and_return(
'User' => [1.2, 1.3],
'Project' => [10.4]
)
expect(null_logger).to receive(:info).with('Project total (1): 10.4ms')
expect(null_logger).to receive(:info).with('User total (2): 2.5ms')
described_class.log_load_times_by_model(null_logger)
end
it 'does nothing when called with a logger that does not have load times' do
expect(null_logger).not_to receive(:info)
expect(described_class.log_load_times_by_model(null_logger)).to be_nil
end
end
describe '.print_by_total_time' do
let(:stdout) { StringIO.new }
let(:regexp) { /^\s+\d+\.\d+\s+(\d+\.\d+)/ }
let(:output) do
stdout.rewind
stdout.read
end
let_it_be(:result) do
Thread.new { sleep 1 }
RubyProf.profile do
sleep 0.1
1.to_s
end
end
around do |example|
original_stdout = $stdout
$stdout = stdout # rubocop: disable RSpec/ExpectOutput
example.run
$stdout = original_stdout # rubocop: disable RSpec/ExpectOutput
end
it 'prints a profile result sorted by total time' do
described_class.print_by_total_time(result)
expect(output).to include('Kernel#sleep')
thread_profiles = output.split('Sort by: total_time').select { |x| x =~ regexp }
thread_profiles.each do |profile|
total_times =
profile
.scan(regexp)
.map { |(total)| total.to_f }
expect(total_times).to eq(total_times.sort.reverse)
end
end
it 'accepts a max_percent option' do
described_class.print_by_total_time(result, max_percent: 50)
expect(output).not_to include('Kernel#sleep')
end
end
end