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|
# frozen_string_literal: true
# rubocop:todo all
require 'lite_spec_helper'
describe Mongo::Srv::Monitor do
describe '#scan!' do
let(:hostname) do
'test1.test.build.10gen.cc'
end
let(:hosts) do
[
'localhost.test.build.10gen.cc:27017',
'localhost.test.build.10gen.cc:27018',
]
end
let(:result) do
double('result').tap do |result|
allow(result).to receive(:hostname).and_return(hostname)
allow(result).to receive(:address_strs).and_return(hosts)
allow(result).to receive(:empty?).and_return(false)
allow(result).to receive(:min_ttl).and_return(nil)
end
end
let(:uri_resolver) do
double('uri resolver').tap do |resolver|
expect(resolver).to receive(:get_records).and_return(result)
end
end
context 'when srv_max_hosts is not specified' do
let(:srv_uri) do
Mongo::URI.get("mongodb+srv://this.is.not.used")
end
let(:cluster) do
Mongo::Cluster.new(hosts, Mongo::Monitoring.new, monitoring_io: false)
end
let(:monitor) do
described_class.new(cluster, srv_uri: srv_uri)
end
before do
# monitor instantiation triggers cluster instantiation which
# performs real SRV lookups for the hostname.
# The next lookup (the one performed when cluster is already set up)
# is using our doubles.
RSpec::Mocks.with_temporary_scope do
allow(uri_resolver).to receive(:get_txt_options_string)
expect(Mongo::Srv::Resolver).to receive(:new).ordered.and_return(uri_resolver)
allow(resolver).to receive(:get_txt_options_string)
expect(Mongo::Srv::Resolver).to receive(:new).ordered.and_return(resolver)
monitor.send(:scan!)
end
end
context 'when a new DNS record is added' do
let(:new_hosts) do
hosts + ['localhost.test.build.10gen.cc:27019']
end
let(:new_result) do
double('result').tap do |result|
allow(result).to receive(:hostname).and_return(hostname)
allow(result).to receive(:address_strs).and_return(new_hosts)
allow(result).to receive(:empty?).and_return(false)
allow(result).to receive(:min_ttl).and_return(nil)
end
end
let(:resolver) do
double('monitor resolver').tap do |resolver|
expect(resolver).to receive(:get_records).and_return(new_result)
end
end
it 'adds the new host to the cluster' do
expect(cluster.servers_list.map(&:address).map(&:to_s).sort).to eq(new_hosts.sort)
end
end
context 'when a DNS record is removed' do
let(:new_hosts) do
hosts - ['test1.test.build.10gen.cc:27018']
end
let(:new_result) do
double('result').tap do |result|
allow(result).to receive(:hostname).and_return(hostname)
allow(result).to receive(:address_strs).and_return(new_hosts)
allow(result).to receive(:empty?).and_return(false)
allow(result).to receive(:min_ttl).and_return(nil)
end
end
let(:resolver) do
double('resolver').tap do |resolver|
allow(resolver).to receive(:get_records).and_return(new_result)
end
end
it 'adds the new host to the cluster' do
expect(cluster.addresses.map(&:to_s).sort).to eq(new_hosts.sort)
end
end
context 'when a single DNS record is replaced' do
let(:new_hosts) do
hosts - ['test1.test.build.10gen.cc:27018'] + ['test1.test.build.10gen.cc:27019']
end
let(:new_result) do
double('result').tap do |result|
allow(result).to receive(:hostname).and_return(hostname)
allow(result).to receive(:address_strs).and_return(new_hosts)
allow(result).to receive(:empty?).and_return(false)
allow(result).to receive(:min_ttl).and_return(nil)
end
end
let(:resolver) do
double('resolver').tap do |resolver|
allow(resolver).to receive(:get_records).and_return(new_result)
end
end
it 'adds the new host to the cluster' do
expect(cluster.addresses.map(&:to_s).sort).to eq(new_hosts.sort)
end
end
context 'when all DNS result are replaced with a single record' do
let(:new_hosts) do
['test1.test.build.10gen.cc:27019']
end
let(:new_result) do
double('result').tap do |result|
allow(result).to receive(:hostname).and_return(hostname)
allow(result).to receive(:address_strs).and_return(new_hosts)
allow(result).to receive(:empty?).and_return(false)
allow(result).to receive(:min_ttl).and_return(nil)
end
end
let(:resolver) do
double('resolver').tap do |resolver|
expect(resolver).to receive(:get_records).and_return(new_result)
end
end
it 'adds the new host to the cluster' do
expect(cluster.addresses.map(&:to_s).sort).to eq(new_hosts.sort)
end
end
context 'when all DNS result are replaced with multiple result' do
let(:new_hosts) do
[
'test1.test.build.10gen.cc:27019',
'test1.test.build.10gen.cc:27020',
]
end
let(:new_result) do
double('result').tap do |result|
allow(result).to receive(:hostname).and_return(hostname)
allow(result).to receive(:address_strs).and_return(new_hosts)
allow(result).to receive(:empty?).and_return(false)
allow(result).to receive(:min_ttl).and_return(nil)
end
end
let(:resolver) do
double('resolver').tap do |resolver|
allow(resolver).to receive(:get_records).and_return(new_result)
end
end
it 'adds the new host to the cluster' do
expect(cluster.addresses.map(&:to_s).sort).to eq(new_hosts.sort)
end
end
context 'when the DNS lookup times out' do
let(:resolver) do
double('resolver').tap do |resolver|
expect(resolver).to receive(:get_records).and_raise(Resolv::ResolvTimeout)
end
end
it 'does not add or remove any hosts from the cluster' do
expect(cluster.addresses.map(&:to_s).sort).to eq(hosts.sort)
end
end
context 'when the DNS lookup is unable to resolve the hostname' do
let(:resolver) do
double('resolver').tap do |resolver|
allow(resolver).to receive(:get_records).and_raise(Resolv::ResolvError)
end
end
it 'does not add or remove any hosts from the cluster' do
expect(cluster.addresses.map(&:to_s).sort).to eq(hosts.sort)
end
end
context 'when no DNS result are returned' do
let(:new_result) do
double('result').tap do |result|
allow(result).to receive(:hostname).and_return(hostname)
allow(result).to receive(:address_strs).and_return([])
allow(result).to receive(:empty?).and_return(true)
allow(result).to receive(:min_ttl).and_return(nil)
end
end
let(:resolver) do
double('resolver').tap do |resolver|
allow(resolver).to receive(:get_records).and_return(new_result)
end
end
it 'does not add or remove any hosts from the cluster' do
expect(cluster.addresses.map(&:to_s).sort).to eq(hosts.sort)
end
end
end
context 'when srv_max_hosts is specified' do
let(:cluster) do
Mongo::Cluster.new(hosts, Mongo::Monitoring.new, monitoring_io: false)
end
let(:limited_result) do
double('result').tap do |result|
allow(result).to receive(:hostname).and_return(hostname)
allow(result).to receive(:address_strs).and_return([hosts.first])
allow(result).to receive(:empty?).and_return(false)
allow(result).to receive(:min_ttl).and_return(nil)
end
end
let(:resolver) do
double('resolver').tap do |resolver|
allow(resolver).to receive(:get_txt_options_string)
expect(resolver).to receive(:get_records).at_least(:once).with(
anything,
anything,
1 # Verify srv_max_hosts=1 is passed
).and_return(limited_result)
end
end
context 'when srv_max_hosts=1 in the URI' do
let(:srv_uri_with_max_hosts) do
Mongo::URI.get("mongodb+srv://this.is.not.used/?srvMaxHosts=1")
end
let(:monitor_with_max_hosts) do
described_class.new(cluster, srv_uri: srv_uri_with_max_hosts)
end
before do
# monitor instantiation triggers cluster instantiation which
# performs real SRV lookups for the hostname.
# The next lookup (the one performed when cluster is already set up)
# is using our doubles.
RSpec::Mocks.with_temporary_scope do
allow(uri_resolver).to receive(:get_txt_options_string)
expect(Mongo::Srv::Resolver).to receive(:new).ordered.and_return(uri_resolver)
allow(resolver).to receive(:get_txt_options_string)
expect(Mongo::Srv::Resolver).to receive(:new).ordered.and_return(resolver)
monitor_with_max_hosts.send(:scan!)
end
end
it 'limits the number of hosts in the cluster and passes srv_max_hosts to resolver' do
expect(cluster.servers_list.size).to eq(1)
end
end
context 'when srv_max_hosts is set on client' do
it 'creates client with srv_max_hosts and passes it to resolver on scan' do
client = nil
expect(Mongo::Srv::Resolver).to receive(:new).at_least(:once).and_return(resolver)
client = Mongo::Client.new('mongodb+srv://test.example.com/', srv_max_hosts: 1, monitoring_io: false, connect: :sharded)
# Start SRV monitor but don't run the background thread
client.cluster.send(:start_stop_srv_monitor)
srv_monitor = client.cluster.instance_variable_get(:@srv_monitor)
# Stop the background thread if it's running
srv_monitor.stop! if srv_monitor.running?
srv_monitor.instance_variable_set(:@resolver, resolver)
srv_monitor.send(:scan!)
expect(client.cluster.servers_list.size).to eq(1)
end
end
end
end
end
|
