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require 'spec_helper'
describe Mongo::ServerSelector do
include_context 'server selector'
describe '.get' do
let(:selector) do
described_class.get(:mode => name, :tag_sets => tag_sets)
end
context 'when a server selector object is passed' do
let(:name) do
:primary
end
it 'returns the object' do
expect(described_class.get(selector)).to be(selector)
end
end
context 'when the mode is primary' do
let(:name) do
:primary
end
it 'returns a read preference of class Primary' do
expect(selector).to be_a(Mongo::ServerSelector::Primary)
end
end
context 'when the mode is primary_preferred' do
let(:name) do
:primary_preferred
end
it 'returns a read preference of class PrimaryPreferred' do
expect(selector).to be_a(Mongo::ServerSelector::PrimaryPreferred)
end
end
context 'when the mode is secondary' do
let(:name) do
:secondary
end
it 'returns a read preference of class Secondary' do
expect(selector).to be_a(Mongo::ServerSelector::Secondary)
end
end
context 'when the mode is secondary_preferred' do
let(:name) do
:secondary_preferred
end
it 'returns a read preference of class SecondaryPreferred' do
expect(selector).to be_a(Mongo::ServerSelector::SecondaryPreferred)
end
end
context 'when the mode is nearest' do
let(:name) do
:nearest
end
it 'returns a read preference of class Nearest' do
expect(selector).to be_a(Mongo::ServerSelector::Nearest)
end
end
context 'when a mode is not provided' do
let(:selector) { described_class.get }
it 'returns a read preference of class Primary' do
expect(selector).to be_a(Mongo::ServerSelector::Primary)
end
end
context 'when tag sets are provided' do
let(:selector) do
described_class.get(:mode => :secondary, :tag_sets => tag_sets)
end
let(:tag_sets) do
[{ 'test' => 'tag' }]
end
it 'sets tag sets on the read preference object' do
expect(selector.tag_sets).to eq(tag_sets)
end
end
context 'when server_selection_timeout is specified' do
let(:selector) do
described_class.get(:mode => :secondary, :server_selection_timeout => 1)
end
it 'sets server selection timeout on the read preference object' do
expect(selector.server_selection_timeout).to eq(1)
end
end
context 'when server_selection_timeout is not specified' do
let(:selector) do
described_class.get(:mode => :secondary)
end
it 'sets server selection timeout to the default' do
expect(selector.server_selection_timeout).to eq(Mongo::ServerSelector::SERVER_SELECTION_TIMEOUT)
end
end
context 'when local_threshold is specified' do
let(:selector) do
described_class.get(:mode => :secondary, :local_threshold => 0.010)
end
it 'sets local_threshold on the read preference object' do
expect(selector.local_threshold).to eq(0.010)
end
end
context 'when local_threshold is not specified' do
let(:selector) do
described_class.get(:mode => :secondary)
end
it 'sets local threshold to the default' do
expect(selector.local_threshold).to eq(Mongo::ServerSelector::LOCAL_THRESHOLD)
end
end
end
describe "#select_server" do
context 'when #select returns a list of nils' do
let(:servers) do
[ make_server(:primary) ]
end
let(:cluster) do
double('cluster').tap do |c|
allow(c).to receive(:topology).and_return(topology)
allow(c).to receive(:servers).and_return(servers)
allow(c).to receive(:single?).and_return(false)
allow(c).to receive(:sharded?).and_return(false)
allow(c).to receive(:unknown?).and_return(false)
allow(c).to receive(:scan!).and_return(true)
allow(c).to receive(:options).and_return(server_selection_timeout: 0.1)
end
end
let(:read_pref) do
described_class.get(mode: :primary).tap do |pref|
allow(pref).to receive(:select).and_return([ nil, nil ])
end
end
it 'raises a NoServerAvailable error' do
expect do
read_pref.select_server(cluster)
end.to raise_exception(Mongo::Error::NoServerAvailable)
end
end
context 'when the cluster has a server_selection_timeout set' do
let(:servers) do
[ make_server(:secondary), make_server(:primary) ]
end
let(:cluster) do
double('cluster').tap do |c|
allow(c).to receive(:topology).and_return(topology)
allow(c).to receive(:servers).and_return(servers)
allow(c).to receive(:single?).and_return(false)
allow(c).to receive(:sharded?).and_return(false)
allow(c).to receive(:unknown?).and_return(false)
allow(c).to receive(:scan!).and_return(true)
allow(c).to receive(:options).and_return(server_selection_timeout: 0)
end
end
let(:read_pref) do
described_class.get(mode: :nearest)
end
it 'uses the server_selection_timeout of the cluster' do
expect{
read_pref.select_server(cluster)
}.to raise_exception(Mongo::Error::NoServerAvailable)
end
end
context 'when the cluster has a local_threshold set' do
let(:near_server) do
make_server(:secondary).tap do |s|
allow(s).to receive(:connectable?).and_return(true)
allow(s).to receive(:average_round_trip_time).and_return(100)
allow(s).to receive(:check_driver_support!).and_return(true)
end
end
let(:far_server) do
make_server(:secondary).tap do |s|
allow(s).to receive(:connectable?).and_return(true)
allow(s).to receive(:average_round_trip_time).and_return(200)
allow(s).to receive(:check_driver_support!).and_return(true)
end
end
let(:servers) do
[ near_server, far_server ]
end
let(:cluster) do
double('cluster').tap do |c|
allow(c).to receive(:topology).and_return(topology)
allow(c).to receive(:servers).and_return(servers)
allow(c).to receive(:single?).and_return(false)
allow(c).to receive(:sharded?).and_return(false)
allow(c).to receive(:unknown?).and_return(false)
allow(c).to receive(:scan!).and_return(true)
allow(c).to receive(:options).and_return(local_threshold: 0.050)
end
end
let(:read_pref) do
described_class.get(mode: :nearest)
end
it 'uses the local_threshold of the cluster' do
expect(read_pref.select_server(cluster)).to eq(near_server)
end
end
end
shared_context 'a ServerSelector' do
context 'when cluster#servers is empty' do
let(:servers) do
[]
end
let(:cluster) do
double('cluster').tap do |c|
allow(c).to receive(:topology).and_return(topology)
allow(c).to receive(:servers).and_return(servers)
allow(c).to receive(:single?).and_return(single)
allow(c).to receive(:sharded?).and_return(sharded)
allow(c).to receive(:unknown?).and_return(false)
allow(c).to receive(:scan!).and_return(true)
allow(c).to receive(:options).and_return(server_selection_timeout: 0.1)
end
end
let(:read_pref) do
described_class.get(mode: :primary)
end
it 'raises a NoServerAvailable error' do
expect do
read_pref.select_server(cluster)
end.to raise_exception(Mongo::Error::NoServerAvailable)
end
end
end
context 'when the cluster has a Single topology' do
let(:single) { true }
let(:sharded) { false }
it_behaves_like 'a ServerSelector'
end
context 'when the cluster has a ReplicaSet topology' do
let(:single) { false }
let(:sharded) { false }
it_behaves_like 'a ServerSelector'
end
context 'when the cluster has a Sharded topology' do
let(:single) { false }
let(:sharded) { true }
it_behaves_like 'a ServerSelector'
end
describe '#inspect' do
let(:options) do
{}
end
let(:read_pref) do
described_class.get({ mode: mode }.merge(options))
end
context 'when the mode is primary' do
let(:mode) do
:primary
end
it 'includes the mode in the inspect string' do
expect(read_pref.inspect).to match(/#{mode.to_s}/i)
end
end
context 'when there are tag sets' do
let(:mode) do
:secondary
end
let(:options) do
{ tag_sets: [{ 'data_center' => 'nyc' }] }
end
it 'includes the tag sets in the inspect string' do
expect(read_pref.inspect).to include(options[:tag_sets].inspect)
end
end
context 'when there is a max staleness set' do
let(:mode) do
:secondary
end
let(:options) do
{ max_staleness: 123 }
end
it 'includes the tag sets in the inspect string' do
expect(read_pref.inspect).to match(/max_staleness/i)
expect(read_pref.inspect).to match(/123/)
end
end
end
end
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