debian-mirror-gitlab/spec/lib/gitlab/exclusive_lease_spec.rb
2020-08-09 17:41:57 +05:30

169 lines
4.6 KiB
Ruby

# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::ExclusiveLease, :clean_gitlab_redis_shared_state do
let(:unique_key) { SecureRandom.hex(10) }
describe '#try_obtain' do
it 'cannot obtain twice before the lease has expired' do
lease = described_class.new(unique_key, timeout: 3600)
expect(lease.try_obtain).to be_present
expect(lease.try_obtain).to eq(false)
end
it 'can obtain after the lease has expired' do
timeout = 1
lease = described_class.new(unique_key, timeout: timeout)
lease.try_obtain # start the lease
sleep(2 * timeout) # lease should have expired now
expect(lease.try_obtain).to be_present
end
end
describe '.redis_shared_state_key' do
it 'provides a namespaced key' do
expect(described_class.redis_shared_state_key(unique_key))
.to start_with(described_class::PREFIX)
.and include(unique_key)
end
end
describe '.ensure_prefixed_key' do
it 'does not double prefix a key' do
prefixed = described_class.redis_shared_state_key(unique_key)
expect(described_class.ensure_prefixed_key(unique_key))
.to eq(described_class.ensure_prefixed_key(prefixed))
end
it 'raises errors when there is no key' do
expect { described_class.ensure_prefixed_key(nil) }.to raise_error(described_class::NoKey)
end
end
describe '#renew' do
it 'returns true when we have the existing lease' do
lease = described_class.new(unique_key, timeout: 3600)
expect(lease.try_obtain).to be_present
expect(lease.renew).to be_truthy
end
it 'returns false when we dont have a lease' do
lease = described_class.new(unique_key, timeout: 3600)
expect(lease.renew).to be_falsey
end
end
describe '#exists?' do
it 'returns true for an existing lease' do
lease = described_class.new(unique_key, timeout: 3600)
lease.try_obtain
expect(lease.exists?).to eq(true)
end
it 'returns false for a lease that does not exist' do
lease = described_class.new(unique_key, timeout: 3600)
expect(lease.exists?).to eq(false)
end
end
describe '.get_uuid' do
it 'gets the uuid if lease with the key associated exists' do
uuid = described_class.new(unique_key, timeout: 3600).try_obtain
expect(described_class.get_uuid(unique_key)).to eq(uuid)
end
it 'returns false if the lease does not exist' do
expect(described_class.get_uuid(unique_key)).to be false
end
end
describe 'cancellation' do
def new_lease(key)
described_class.new(key, timeout: 3600)
end
shared_examples 'cancelling a lease' do
let(:lease) { new_lease(unique_key) }
it 'releases the held lease' do
uuid = lease.try_obtain
expect(uuid).to be_present
expect(new_lease(unique_key).try_obtain).to eq(false)
cancel_lease(uuid)
expect(new_lease(unique_key).try_obtain).to be_present
end
end
describe '.cancel' do
def cancel_lease(uuid)
described_class.cancel(release_key, uuid)
end
context 'when called with the unprefixed key' do
it_behaves_like 'cancelling a lease' do
let(:release_key) { unique_key }
end
end
context 'when called with the prefixed key' do
it_behaves_like 'cancelling a lease' do
let(:release_key) { described_class.redis_shared_state_key(unique_key) }
end
end
it 'does not raise errors when given a nil key' do
expect { described_class.cancel(nil, nil) }.not_to raise_error
end
end
describe '#cancel' do
def cancel_lease(_uuid)
lease.cancel
end
it_behaves_like 'cancelling a lease'
it 'is safe to call even if the lease was never obtained' do
lease = new_lease(unique_key)
lease.cancel
expect(new_lease(unique_key).try_obtain).to be_present
end
end
end
describe '#ttl' do
it 'returns the TTL of the Redis key' do
lease = described_class.new('kittens', timeout: 100)
lease.try_obtain
expect(lease.ttl <= 100).to eq(true)
end
it 'returns nil when the lease does not exist' do
lease = described_class.new('kittens', timeout: 10)
expect(lease.ttl).to be_nil
end
end
describe '.reset_all!' do
it 'removes all existing lease keys from redis' do
uuid = described_class.new(unique_key, timeout: 3600).try_obtain
expect(described_class.get_uuid(unique_key)).to eq(uuid)
described_class.reset_all!
expect(described_class.get_uuid(unique_key)).to be_falsey
end
end
end