mirror of
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synced 2024-11-27 09:36:19 -05:00
109 lines
3.5 KiB
Ruby
109 lines
3.5 KiB
Ruby
require 'rails_helper'
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describe DiscourseRedis do
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let(:slave_host) { 'testhost' }
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let(:slave_port) { 1234 }
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let(:config) do
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DiscourseRedis.config.dup.merge({
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slave_host: 'testhost', slave_port: 1234, connector: DiscourseRedis::Connector
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})
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end
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let(:fallback_handler) { DiscourseRedis::FallbackHandler.instance }
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context '.slave_host' do
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it 'should return the right config' do
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slave_config = DiscourseRedis.slave_config(config)
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expect(slave_config[:host]).to eq(slave_host)
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expect(slave_config[:port]).to eq(slave_port)
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end
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end
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context 'when redis connection is to a slave redis server' do
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it 'should check the status of the master server' do
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begin
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fallback_handler.master = false
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$redis.without_namespace.expects(:get).raises(Redis::CommandError.new("READONLY"))
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fallback_handler.expects(:verify_master).once
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$redis.get('test')
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ensure
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fallback_handler.master = true
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end
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end
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end
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describe DiscourseRedis::Connector do
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let(:connector) { DiscourseRedis::Connector.new(config) }
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it 'should return the master config when master is up' do
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expect(connector.resolve).to eq(config)
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end
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it 'should return the slave config when master is down' do
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begin
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Redis::Client.any_instance.expects(:call).raises(Redis::CannotConnectError).twice
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expect { connector.resolve }.to raise_error(Redis::CannotConnectError)
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config = connector.resolve
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expect(config[:host]).to eq(slave_host)
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expect(config[:port]).to eq(slave_port)
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ensure
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fallback_handler.master = true
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end
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end
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it "should return the slave config when master's hostname cannot be resolved" do
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begin
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error = RuntimeError.new('Name or service not known')
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Redis::Client.any_instance.expects(:call).raises(error).twice
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expect { connector.resolve }.to raise_error(error)
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config = connector.resolve
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expect(config[:host]).to eq(slave_host)
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expect(config[:port]).to eq(slave_port)
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ensure
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fallback_handler.master = true
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end
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end
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it "should raise the right error" do
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error = RuntimeError.new('test error')
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Redis::Client.any_instance.expects(:call).raises(error).twice
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2.times { expect { connector.resolve }.to raise_error(error) }
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end
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end
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describe DiscourseRedis::FallbackHandler do
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describe '#initiate_fallback_to_master' do
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it 'should fallback to the master server once it is up' do
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begin
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fallback_handler.master = false
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Redis::Client.any_instance.expects(:call).with([:info]).returns(DiscourseRedis::FallbackHandler::MASTER_LINK_STATUS)
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DiscourseRedis::FallbackHandler::CONNECTION_TYPES.each do |connection_type|
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Redis::Client.any_instance.expects(:call).with([:client, [:kill, 'type', connection_type]])
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end
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fallback_handler.initiate_fallback_to_master
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expect(fallback_handler.master).to eq(true)
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expect(Discourse.recently_readonly?).to eq(false)
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ensure
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fallback_handler.master = true
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end
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end
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it "should restrict the number of checks" do
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expect { fallback_handler.verify_master }.to change { Thread.list.count }.by(1)
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expect(fallback_handler.master).to eq(true)
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fallback_handler.master = false
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expect { fallback_handler.verify_master }.to_not change { Thread.list.count }
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end
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end
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end
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end
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