87 lines
2.9 KiB
Ruby
87 lines
2.9 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
describe DiscourseAi::Utils::DnsSrv do
|
|
let(:domain) { "example.com" }
|
|
let(:weighted_dns_results) do
|
|
[
|
|
Resolv::DNS::Resource::IN::SRV.new(1, 1, 443, "service1.example.com"),
|
|
Resolv::DNS::Resource::IN::SRV.new(2, 2, 443, "service2.example.com"),
|
|
Resolv::DNS::Resource::IN::SRV.new(2, 2, 443, "service3.example.com"),
|
|
Resolv::DNS::Resource::IN::SRV.new(3, 1, 443, "service4.example.com"),
|
|
Resolv::DNS::Resource::IN::SRV.new(3, 1, 443, "service5.example.com"),
|
|
]
|
|
end
|
|
|
|
context "when there are several servers with the same priority" do
|
|
before do
|
|
Resolv::DNS.any_instance.stubs(:getresources).returns(weighted_dns_results)
|
|
|
|
Discourse.cache.delete("dns_srv_lookup:#{domain}")
|
|
|
|
(1..5).each do |i|
|
|
stub_request(:head, "https://service#{i}.example.com/").to_return(status: 200)
|
|
end
|
|
end
|
|
|
|
it "picks a server" do
|
|
selected_server = DiscourseAi::Utils::DnsSrv.lookup(domain)
|
|
|
|
expect(weighted_dns_results).to include(selected_server)
|
|
expect(selected_server.port).to eq(443)
|
|
end
|
|
|
|
it "doesn't pick a server with lower priority" do
|
|
selected_server = DiscourseAi::Utils::DnsSrv.lookup(domain)
|
|
expect(weighted_dns_results.filter { |r| r.priority == 1 }).to include(selected_server)
|
|
end
|
|
end
|
|
|
|
context "when the first server is not available" do
|
|
before do
|
|
Resolv::DNS.any_instance.stubs(:getresources).returns(weighted_dns_results)
|
|
|
|
Discourse.cache.delete("dns_srv_lookup:#{domain}")
|
|
|
|
stub_request(:head, "https://service1.example.com/").to_raise(Faraday::SSLError)
|
|
|
|
(2..5).each do |i|
|
|
stub_request(:head, "https://service#{i}.example.com/").to_return(status: 200)
|
|
end
|
|
end
|
|
|
|
it "picks another server" do
|
|
selected_server = DiscourseAi::Utils::DnsSrv.lookup(domain)
|
|
|
|
expect(weighted_dns_results).to include(selected_server)
|
|
expect(selected_server.port).to eq(443)
|
|
expect(selected_server.target.to_s).to_not eq("service1.example.com")
|
|
end
|
|
end
|
|
|
|
context "when the multiple servers are not available" do
|
|
before do
|
|
Resolv::DNS.any_instance.stubs(:getresources).returns(weighted_dns_results)
|
|
|
|
Discourse.cache.delete("dns_srv_lookup:#{domain}")
|
|
|
|
(1..3).each do |i|
|
|
stub_request(:head, "https://service#{i}.example.com/").to_raise(Faraday::SSLError)
|
|
end
|
|
|
|
(4..5).each do |i|
|
|
stub_request(:head, "https://service#{i}.example.com/").to_return(status: 200)
|
|
end
|
|
end
|
|
|
|
it "picks another server" do
|
|
selected_server = DiscourseAi::Utils::DnsSrv.lookup(domain)
|
|
|
|
expect(weighted_dns_results).to include(selected_server)
|
|
expect(selected_server.port).to eq(443)
|
|
expect(selected_server.target.to_s).to_not eq("service1.example.com")
|
|
expect(selected_server.target.to_s).to_not eq("service2.example.com")
|
|
expect(selected_server.target.to_s).to_not eq("service3.example.com")
|
|
end
|
|
end
|
|
end
|