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# frozen_string_literal: true
require_relative '../helper'
describe 'CAS behavior' do
MemcachedManager.supported_protocols.each do |p|
describe "using the #{p} protocol" do
describe 'get_cas' do
describe 'when no block is given' do
it 'returns the value and a CAS' do
memcached_persistent(p) do |dc|
dc.flush
dc.set('key1', 'abcd')
value, cas = dc.get_cas('key1')
assert_equal 'abcd', value
assert valid_cas?(cas)
end
end
# This is historical, as the 'Not found' value was
# treated as a special case at one time
it 'allows "Not found" as value' do
memcached_persistent(p) do |dc|
dc.flush
dc.set('key1', 'Not found')
value, cas = dc.get_cas('key1')
assert_equal 'Not found', value
assert valid_cas?(cas)
end
end
it 'returns [nil, 0] on a miss' do
memcached_persistent(p) do |dc|
dc.flush
value, cas = dc.get_cas('key1')
assert_nil value
assert_equal 0, cas
end
end
end
describe 'when a block is given' do
it 'yields the value and a CAS to the block' do
memcached_persistent(p) do |dc|
dc.flush
expected = { 'blah' => 'blerg!' }
set_cas = dc.set('gets_key', expected)
get_block_called = false
block_value = SecureRandom.hex(4)
stored_value = stored_cas = nil
# Validate call-with-block on hit
res = dc.get_cas('gets_key') do |v, cas|
get_block_called = true
stored_value = v
stored_cas = cas
block_value
end
assert get_block_called
assert_equal expected, stored_value
assert valid_cas?(stored_cas)
assert_equal set_cas, stored_cas
assert_equal block_value, res
end
end
# This is historical, as the 'Not found' value was
# treated as a special case at one time
it 'allows "Not found" as value' do
memcached_persistent(p) do |dc|
dc.flush
expected = 'Not found'
set_cas = dc.set('gets_key', expected)
get_block_called = false
block_value = SecureRandom.hex(4)
stored_value = stored_cas = nil
# Validate call-with-block on hit
res = dc.get_cas('gets_key') do |v, cas|
get_block_called = true
stored_value = v
stored_cas = cas
block_value
end
assert get_block_called
assert_equal expected, stored_value
assert valid_cas?(stored_cas)
assert_equal set_cas, stored_cas
assert_equal block_value, res
end
end
it 'yields [nil, 0] to the block on a miss' do
memcached_persistent(p) do |dc|
dc.flush
get_block_called = false
block_value = SecureRandom.hex(4)
stored_value = stored_cas = nil
# Validate call-with-block on miss
res = dc.get_cas('gets_key') do |v, cas|
get_block_called = true
stored_value = v
stored_cas = cas
block_value
end
assert get_block_called
assert_nil stored_value
assert_equal 0, stored_cas
assert_equal block_value, res
end
end
end
end
it 'supports multi-get with CAS' do
memcached_persistent(p) do |dc|
dc.close
dc.flush
expected_hash = { 'a' => 'foo', 'b' => 123 }
expected_hash.each_pair do |k, v|
dc.set(k, v)
end
# Invocation without block
resp = dc.get_multi_cas(%w[a b c d e f])
resp.each_pair do |k, data|
value = data.first
cas = data[1]
assert_equal expected_hash[k], value
assert(cas && cas != 0)
end
# Invocation with block
dc.get_multi_cas(%w[a b c d e f]) do |k, data|
value = data.first
cas = data[1]
assert_equal expected_hash[k], value
assert(cas && cas != 0)
end
end
end
it 'supports replace-with-CAS operation' do
memcached_persistent(p) do |dc|
dc.flush
cas = dc.set('key', 'value')
# Accepts CAS, replaces, and returns new CAS
cas = dc.replace_cas('key', 'value2', cas)
assert_kind_of Integer, cas
assert_equal 'value2', dc.get('key')
end
end
# There's a bug in some versions of memcached where
# the meta delete doesn't honor the CAS argument
# Ensure our tests run correctly when used with
# either set of versions
if MemcachedManager.supports_delete_cas?(p)
it 'supports delete with CAS' do
memcached_persistent(p) do |dc|
cas = dc.set('some_key', 'some_value')
# It returns falsey and doesn't delete
# when the CAS is wrong
refute dc.delete_cas('some_key', 123)
assert_equal 'some_value', dc.get('some_key')
dc.delete_cas('some_key', cas)
assert_nil dc.get('some_key')
refute dc.delete_cas('nonexist', 123)
end
end
it 'handles CAS round-trip operations' do
memcached_persistent(p) do |dc|
dc.flush
expected = { 'blah' => 'blerg!' }
dc.set('some_key', expected)
value, cas = dc.get_cas('some_key')
assert_equal value, expected
assert(!cas.nil? && cas != 0)
# Set operation, first with wrong then with correct CAS
expected = { 'blah' => 'set succeeded' }
refute(dc.set_cas('some_key', expected, cas + 1))
assert op_addset_succeeds(cas = dc.set_cas('some_key', expected, cas))
# Replace operation, first with wrong then with correct CAS
expected = { 'blah' => 'replace succeeded' }
refute(dc.replace_cas('some_key', expected, cas + 1))
assert op_addset_succeeds(cas = dc.replace_cas('some_key', expected, cas))
# Delete operation, first with wrong then with correct CAS
refute(dc.delete_cas('some_key', cas + 1))
assert dc.delete_cas('some_key', cas)
end
end
end
describe 'cas' do
it 'does not call the block when the key has no existing value' do
memcached_persistent(p) do |dc|
dc.flush
resp = dc.cas('cas_key') do |_value|
raise('Value it not exist')
end
assert_nil resp
assert_nil dc.cas('cas_key')
end
end
it 'calls the block and sets a new value when the key has an existing value' do
memcached_persistent(p) do |dc|
dc.flush
expected = { 'blah' => 'blerg!' }
dc.set('cas_key', expected)
mutated = { 'blah' => 'foo!' }
resp = dc.cas('cas_key') do |value|
assert_equal expected, value
mutated
end
assert op_cas_succeeds(resp)
resp = dc.get('cas_key')
assert_equal mutated, resp
end
end
it "calls the block and sets a new value when the key has the value 'Not found'" do
memcached_persistent(p) do |dc|
dc.flush
expected = 'Not found'
dc.set('cas_key', expected)
mutated = { 'blah' => 'foo!' }
resp = dc.cas('cas_key') do |value|
assert_equal expected, value
mutated
end
assert op_cas_succeeds(resp)
resp = dc.get('cas_key')
assert_equal mutated, resp
end
end
end
describe 'cas!' do
it 'calls the block and sets a new value when the key has no existing value' do
memcached_persistent(p) do |dc|
dc.flush
mutated = { 'blah' => 'foo!' }
resp = dc.cas!('cas_key') do |value|
assert_nil value
mutated
end
assert op_cas_succeeds(resp)
resp = dc.get('cas_key')
assert_equal mutated, resp
end
end
it 'calls the block and sets a new value when the key has an existing value' do
memcached_persistent(p) do |dc|
dc.flush
expected = { 'blah' => 'blerg!' }
dc.set('cas_key', expected)
mutated = { 'blah' => 'foo!' }
resp = dc.cas!('cas_key') do |value|
assert_equal expected, value
mutated
end
assert op_cas_succeeds(resp)
resp = dc.get('cas_key')
assert_equal mutated, resp
end
end
it "calls the block and sets a new value when the key has the value 'Not found'" do
memcached_persistent(p) do |dc|
dc.flush
expected = 'Not found'
dc.set('cas_key', expected)
mutated = { 'blah' => 'foo!' }
resp = dc.cas!('cas_key') do |value|
assert_equal expected, value
mutated
end
assert op_cas_succeeds(resp)
resp = dc.get('cas_key')
assert_equal mutated, resp
end
end
end
end
end
end
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