debian-mirror-gitlab/spec/lib/gitlab/exclusive_lease_spec.rb

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# frozen_string_literal: true
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require 'spec_helper'
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RSpec.describe Gitlab::ExclusiveLease, :clean_gitlab_redis_shared_state do
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let(:unique_key) { SecureRandom.hex(10) }
describe '#try_obtain' do
it 'cannot obtain twice before the lease has expired' do
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lease = described_class.new(unique_key, timeout: 3600)
expect(lease.try_obtain).to be_present
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expect(lease.try_obtain).to eq(false)
end
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it 'can obtain after the lease has expired' do
timeout = 1
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lease = described_class.new(unique_key, timeout: timeout)
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lease.try_obtain # start the lease
sleep(2 * timeout) # lease should have expired now
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expect(lease.try_obtain).to be_present
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end
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end
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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
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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
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describe '#exists?' do
it 'returns true for an existing lease' do
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lease = described_class.new(unique_key, timeout: 3600)
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lease.try_obtain
expect(lease.exists?).to eq(true)
end
it 'returns false for a lease that does not exist' do
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lease = described_class.new(unique_key, timeout: 3600)
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expect(lease.exists?).to eq(false)
end
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end
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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
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describe 'cancellation' do
def new_lease(key)
described_class.new(key, timeout: 3600)
end
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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
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end
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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
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end
end
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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
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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
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describe '.throttle' do
it 'prevents repeated execution of the block' do
number = 0
action = -> { described_class.throttle(1) { number += 1 } }
action.call
action.call
expect(number).to eq 1
end
it 'is distinct by block' do
number = 0
described_class.throttle(1) { number += 1 }
described_class.throttle(1) { number += 1 }
expect(number).to eq 2
end
it 'is distinct by key' do
number = 0
action = ->(k) { described_class.throttle(k) { number += 1 } }
action.call(:a)
action.call(:b)
action.call(:a)
expect(number).to eq 2
end
it 'allows a group to be passed' do
number = 0
described_class.throttle(1, group: :a) { number += 1 }
described_class.throttle(1, group: :b) { number += 1 }
described_class.throttle(1, group: :a) { number += 1 }
described_class.throttle(1, group: :b) { number += 1 }
expect(number).to eq 2
end
it 'defaults to a 60min timeout' do
expect(described_class).to receive(:new).with(anything, hash_including(timeout: 1.hour.to_i)).and_call_original
described_class.throttle(1) {}
end
it 'allows count to be specified' do
expect(described_class)
.to receive(:new)
.with(anything, hash_including(timeout: 15.minutes.to_i))
.and_call_original
described_class.throttle(1, count: 4) {}
end
it 'allows period to be specified' do
expect(described_class)
.to receive(:new)
.with(anything, hash_including(timeout: 1.day.to_i))
.and_call_original
described_class.throttle(1, period: 1.day) {}
end
it 'allows period and count to be specified' do
expect(described_class)
.to receive(:new)
.with(anything, hash_including(timeout: 30.minutes.to_i))
.and_call_original
described_class.throttle(1, count: 48, period: 1.day) {}
end
end
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end