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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::ExclusiveLeaseHelpers::SleepingLock, :clean_gitlab_redis_shared_state do
include ::ExclusiveLeaseHelpers
let(:timeout) { 1.second }
let(:delay) { 0.1.seconds }
let(:key) { SecureRandom.hex(10) }
subject { described_class.new(key, timeout: timeout, delay: delay) }
describe '#retried?' do
before do
stub_exclusive_lease(key, 'uuid')
end
context 'we have not made any attempts' do
it { is_expected.not_to be_retried }
end
context 'we just made a single (initial) attempt' do
it 'is not considered a retry' do
subject.send(:try_obtain)
is_expected.not_to be_retried
end
end
context 'made multiple attempts' do
it 'is considered a retry' do
2.times { subject.send(:try_obtain) }
is_expected.to be_retried
end
end
end
describe '#obtain' do
context 'when the lease is not held' do
before do
stub_exclusive_lease(key, 'uuid')
end
it 'obtains the lease on the first attempt, without sleeping' do
expect(subject).not_to receive(:sleep)
subject.obtain(10)
expect(subject).not_to be_retried
end
end
context 'when the lease is held elsewhere' do
let!(:lease) { stub_exclusive_lease_taken(key) }
let(:max_attempts) { 7 }
it 'retries to obtain a lease and raises an error' do
expect(subject).to receive(:sleep).with(delay).exactly(max_attempts - 1).times
expect(lease).to receive(:try_obtain).exactly(max_attempts).times
expect { subject.obtain(max_attempts) }.to raise_error('Failed to obtain a lock')
end
context 'when the delay is computed from the attempt number' do
let(:delay) { ->(n) { 3 * n } }
it 'uses the computation to determine the sleep length' do
expect(subject).to receive(:sleep).with(3).once
expect(subject).to receive(:sleep).with(6).once
expect(subject).to receive(:sleep).with(9).once
expect(lease).to receive(:try_obtain).exactly(4).times
expect { subject.obtain(4) }.to raise_error('Failed to obtain a lock')
end
end
context 'when lease is granted after retry' do
it 'knows that it retried' do
expect(subject).to receive(:sleep).with(delay).exactly(3).times
expect(lease).to receive(:try_obtain).exactly(3).times { nil }
expect(lease).to receive(:try_obtain).once { 'obtained' }
subject.obtain(max_attempts)
expect(subject).to be_retried
end
end
end
describe 'cancel' do
let!(:lease) { stub_exclusive_lease(key, 'uuid') }
it 'cancels the lease' do
expect(lease).to receive(:cancel)
subject.cancel
end
end
end
end
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