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require 'spec_helper'
describe Mongo::ServerSelector::PrimaryPreferred do
let(:name) { :primary_preferred }
include_context 'server selector'
it_behaves_like 'a server selector mode' do
let(:slave_ok) { true }
end
it_behaves_like 'a server selector accepting tag sets'
it_behaves_like 'a server selector with sensitive data in its options'
describe '#initialize' do
context 'when max_staleness is provided' do
let(:options) do
{ max_staleness: 95 }
end
it 'sets the max_staleness option' do
expect(selector.max_staleness).to eq(options[:max_staleness])
end
end
end
describe '#==' do
context 'when max staleness is the same' do
let(:options) do
{ max_staleness: 95 }
end
let(:other) do
described_class.new(options)
end
it 'returns true' do
expect(selector).to eq(other)
end
end
context 'when max staleness is different' do
let(:other_options) do
{ max_staleness: 100 }
end
let(:other) do
described_class.new(other_options)
end
it 'returns false' do
expect(selector).not_to eq(other)
end
end
end
describe '#to_mongos' do
context 'tag sets not provided' do
it 'returns a read preference formatted for mongos' do
expect(selector.to_mongos).to eq({ :mode => 'primaryPreferred' })
end
end
context 'tag set provided' do
let(:tag_sets) { [tag_set] }
it 'returns a read preference formatted for mongos' do
expect(selector.to_mongos).to eq(
{ :mode => 'primaryPreferred', :tags => tag_sets}
)
end
end
context 'max staleness not provided' do
let(:expected) do
{ :mode => 'primaryPreferred' }
end
it 'returns a read preference formatted for mongos' do
expect(selector.to_mongos).to eq(expected)
end
end
context 'max staleness provided' do
let(:max_staleness) do
100
end
let(:expected) do
{ :mode => 'primaryPreferred', maxStalenessSeconds: 100 }
end
it 'returns a read preference formatted for mongos' do
expect(selector.to_mongos).to eq(expected)
end
end
end
describe '#select' do
context 'no candidates' do
let(:candidates) { [] }
it 'returns an empty array' do
expect(selector.send(:select, candidates)).to be_empty
end
end
context 'single primary candidate' do
let(:candidates) { [primary] }
it 'returns an array with the primary' do
expect(selector.send(:select, candidates)).to eq( [primary] )
end
end
context 'single secondary candidate' do
let(:candidates) { [secondary] }
it 'returns an array with the secondary' do
expect(selector.send(:select, candidates)).to eq( [secondary] )
end
end
context 'primary and secondary candidates' do
let(:candidates) { [secondary, primary] }
let(:expected) { [primary] }
it 'returns an array with the primary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
context 'secondary and primary candidates' do
let(:candidates) { [secondary, primary] }
let(:expected) { [primary] }
it 'returns an array with the primary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
context 'tag sets provided' do
let(:tag_sets) { [tag_set] }
let(:matching_primary) do
make_server(:primary, :tags => server_tags, address: default_address )
end
let(:matching_secondary) do
make_server(:secondary, :tags => server_tags, address: default_address )
end
context 'single candidate' do
context 'primary' do
let(:candidates) { [primary] }
it 'returns array with primary' do
expect(selector.send(:select, candidates)).to eq([primary])
end
end
context 'matching_primary' do
let(:candidates) { [matching_primary] }
it 'returns array with matching primary' do
expect(selector.send(:select, candidates)).to eq([matching_primary])
end
end
context 'matching secondary' do
let(:candidates) { [matching_secondary] }
it 'returns array with matching secondary' do
expect(selector.send(:select, candidates)).to eq([matching_secondary])
end
end
context 'secondary' do
let(:candidates) { [secondary] }
it 'returns an empty array' do
expect(selector.send(:select, candidates)).to be_empty
end
end
end
context 'multiple candidates' do
context 'no matching secondaries' do
let(:candidates) { [primary, secondary, secondary] }
it 'returns an array with the primary' do
expect(selector.send(:select, candidates)).to eq([primary])
end
end
context 'one matching primary' do
let(:candidates) { [matching_primary, secondary, secondary] }
it 'returns an array of the primary' do
expect(selector.send(:select, candidates)).to eq([matching_primary])
end
end
context 'one matching secondary' do
let(:candidates) { [primary, matching_secondary, secondary] }
let(:expected) { [primary] }
it 'returns an array of the primary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
context 'two matching secondaries' do
let(:candidates) { [primary, matching_secondary, matching_secondary] }
let(:expected) { [primary] }
it 'returns an array of the primary ' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
context 'one matching primary, one matching secondary' do
let(:candidates) { [primary, matching_secondary, secondary] }
let(:expected) { [primary] }
it 'returns an array of the primary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
end
end
context 'high latency servers' do
let(:far_primary) { make_server(:primary, :average_round_trip_time => 0.100, address: default_address) }
let(:far_secondary) { make_server(:secondary, :average_round_trip_time => 0.113, address: default_address) }
context 'single candidate' do
context 'far primary' do
let(:candidates) { [far_primary] }
it 'returns array with far primary' do
expect(selector.send(:select, candidates)).to eq([far_primary])
end
end
context 'far secondary' do
let(:candidates) { [far_secondary] }
it 'returns array with far primary' do
expect(selector.send(:select, candidates)).to eq([far_secondary])
end
end
end
context 'multiple candidates' do
context 'primary available' do
context 'local primary, local secondary' do
let(:candidates) { [primary, secondary] }
let(:expected) { [primary] }
it 'returns an array of the primary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
context 'local primary, far secondary' do
let(:candidates) { [primary, far_secondary] }
let(:expected) { [primary] }
it 'returns an array of the primary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
context 'far primary, local secondary' do
let(:candidates) { [far_primary, secondary] }
let(:expected) { [far_primary] }
it 'returns an array of the far primary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
context 'far primary, far secondary' do
let(:candidates) { [far_primary, far_secondary] }
let(:expected) { [far_primary] }
it 'returns an array of the far primary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
context 'two local servers, one far server' do
context 'local primary, local secondary, far secondary' do
let(:candidates) { [primary, secondary, far_secondary] }
let(:expected) { [primary] }
it 'returns an array of the primary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
context 'two local secondaries' do
let(:candidates) { [far_primary, secondary, secondary] }
let(:expected) { [far_primary] }
it 'returns an array with primary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
end
end
context 'primary not available' do
context 'one secondary' do
let(:candidates) { [secondary] }
let(:expected) { [secondary] }
it 'returns an array with the secondary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
context 'one local secondary, one far secondary' do
let(:candidates) { [secondary, far_secondary] }
let(:expected) { [secondary] }
it 'returns an array of the secondary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
context 'two local secondaries, one far secondary' do
let(:candidates) { [secondary, secondary, far_secondary] }
let(:expected) { [secondary, secondary] }
it 'returns an array of the secondary' do
expect(selector.send(:select, candidates)).to eq(expected)
end
end
end
end
end
end
end
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