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require 'spec_helper'
describe Gitlab::Database::Count do
before do
create_list(:project, 3)
create(:identity)
end
let(:models) { [Project, Identity] }
context '.approximate_counts' do
context 'selecting strategies' do
let(:strategies) { [double('s1', :enabled? => true), double('s2', :enabled? => false)] }
it 'uses only enabled strategies' do
expect(strategies[0]).to receive(:new).and_return(double('strategy1', count: {}))
expect(strategies[1]).not_to receive(:new)
described_class.approximate_counts(models, strategies: strategies)
end
end
context 'fallbacks' do
subject { described_class.approximate_counts(models, strategies: strategies) }
let(:strategies) do
[
double('s1', :enabled? => true, new: first_strategy),
double('s2', :enabled? => true, new: second_strategy)
]
end
let(:first_strategy) { double('first strategy', count: {}) }
let(:second_strategy) { double('second strategy', count: {}) }
it 'gets results from first strategy' do
expect(strategies[0]).to receive(:new).with(models).and_return(first_strategy)
expect(first_strategy).to receive(:count)
subject
end
it 'gets more results from second strategy if some counts are missing' do
expect(first_strategy).to receive(:count).and_return({ Project => 3 })
expect(strategies[1]).to receive(:new).with([Identity]).and_return(second_strategy)
expect(second_strategy).to receive(:count).and_return({ Identity => 1 })
expect(subject).to eq({ Project => 3, Identity => 1 })
end
it 'does not get more results as soon as all counts are present' do
expect(first_strategy).to receive(:count).and_return({ Project => 3, Identity => 1 })
expect(strategies[1]).not_to receive(:new)
subject
end
end
end
describe Gitlab::Database::Count::ExactCountStrategy do
subject { described_class.new(models).count }
describe '#count' do
it 'counts all models' do
models.each { |model| expect(model).to receive(:count).and_call_original }
expect(subject).to eq({ Project => 3, Identity => 1 })
end
end
describe '.enabled?' do
it 'is enabled for PostgreSQL' do
allow(Gitlab::Database).to receive(:postgresql?).and_return(true)
expect(described_class.enabled?).to be_truthy
end
it 'is enabled for MySQL' do
allow(Gitlab::Database).to receive(:postgresql?).and_return(false)
expect(described_class.enabled?).to be_truthy
end
end
end
describe Gitlab::Database::Count::ReltuplesCountStrategy do
subject { described_class.new(models).count }
describe '#count' do
context 'when reltuples is up to date' do
before do
ActiveRecord::Base.connection.execute('ANALYZE projects')
ActiveRecord::Base.connection.execute('ANALYZE identities')
end
it 'uses statistics to do the count' do
models.each { |model| expect(model).not_to receive(:count) }
expect(subject).to eq({ Project => 3, Identity => 1 })
end
end
context 'insufficient permissions' do
it 'returns an empty hash' do
allow(ActiveRecord::Base).to receive(:transaction).and_raise(PG::InsufficientPrivilege)
expect(subject).to eq({})
end
end
end
describe '.enabled?' do
it 'is enabled for PostgreSQL' do
allow(Gitlab::Database).to receive(:postgresql?).and_return(true)
expect(described_class.enabled?).to be_truthy
end
it 'is disabled for MySQL' do
allow(Gitlab::Database).to receive(:postgresql?).and_return(false)
expect(described_class.enabled?).to be_falsey
end
end
end
describe Gitlab::Database::Count::TablesampleCountStrategy do
subject { strategy.count }
let(:strategy) { described_class.new(models) }
describe '#count' do
let(:estimates) { { Project => threshold + 1, Identity => threshold - 1 } }
let(:threshold) { Gitlab::Database::Count::TablesampleCountStrategy::EXACT_COUNT_THRESHOLD }
before do
allow(strategy).to receive(:size_estimates).with(check_statistics: false).and_return(estimates)
end
context 'for tables with an estimated small size' do
it 'performs an exact count' do
expect(Identity).to receive(:count).and_call_original
expect(subject).to include({ Identity => 1 })
end
end
context 'for tables with an estimated large size' do
it 'performs a tablesample count' do
expect(Project).not_to receive(:count)
result = subject
expect(result[Project]).to eq(3)
end
end
context 'insufficient permissions' do
it 'returns an empty hash' do
allow(strategy).to receive(:size_estimates).and_raise(PG::InsufficientPrivilege)
expect(subject).to eq({})
end
end
end
describe '.enabled?' do
it 'is enabled for PostgreSQL' do
allow(Gitlab::Database).to receive(:postgresql?).and_return(true)
expect(described_class.enabled?).to be_truthy
end
it 'is disabled for MySQL' do
allow(Gitlab::Database).to receive(:postgresql?).and_return(false)
expect(described_class.enabled?).to be_falsey
end
end
end
end
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