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# frozen_string_literal: true
require_relative 'helper'
class TestServer
attr_reader :name
def initialize(attribs, _client_options = {})
@name = attribs
end
def weight
1
end
end
describe 'Ring' do
describe 'a ring of servers' do
it 'have the continuum sorted by value' do
servers = ['localhost:11211', 'localhost:9500']
ring = Dalli::Ring.new(servers, TestServer, {})
previous_value = 0
ring.continuum.each do |entry|
assert_operator entry.value, :>, previous_value
previous_value = entry.value
end
end
it 'raise when no servers are available/defined' do
ring = Dalli::Ring.new([], TestServer, {})
assert_raises Dalli::RingError, message: 'No server available' do
ring.server_for_key('test')
end
end
describe 'containing only a single server' do
it "raise correctly when it's not alive" do
servers = ['localhost:12345']
ring = Dalli::Ring.new(servers, Dalli::Protocol::Binary, {})
assert_raises Dalli::RingError, message: 'No server available' do
ring.server_for_key('test')
end
end
it "return the server when it's alive" do
servers = ['localhost:19191']
ring = Dalli::Ring.new(servers, Dalli::Protocol::Binary, {})
memcached(:binary, 19_191) do |mc|
ring = mc.send(:ring)
assert_equal ring.servers.first.port, ring.server_for_key('test').port
end
end
end
describe 'containing multiple servers' do
it 'raise correctly when no server is alive' do
servers = ['localhost:12345', 'localhost:12346']
ring = Dalli::Ring.new(servers, Dalli::Protocol::Binary, {})
assert_raises Dalli::RingError, message: 'No server available' do
ring.server_for_key('test')
end
end
it 'return an alive server when at least one is alive' do
servers = ['localhost:12346', 'localhost:19191']
ring = Dalli::Ring.new(servers, Dalli::Protocol::Binary, {})
memcached(:binary, 19_191) do |mc|
ring = mc.send(:ring)
assert_equal ring.servers.first.port, ring.server_for_key('test').port
end
end
end
it 'detect when a dead server is up again' do
memcached(:binary, 19_997) do
down_retry_delay = 0.5
dc = Dalli::Client.new(['localhost:19997', 'localhost:19998'], down_retry_delay: down_retry_delay)
assert_equal 1, dc.stats.values.compact.count
memcached(:binary, 19_998) do
assert_equal 2, dc.stats.values.compact.count
end
end
end
end
end
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