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metastore_test.rb
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metastore_test.rb
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require "#{File.dirname(__FILE__)}/spec_setup"
require 'rack/cache/metastore'
require 'rack/cache/entitystore'
shared 'A Rack::Cache::MetaStore Implementation' do
###
# Helpers
def mock_request(uri, opts)
env = Rack::MockRequest.env_for(uri, opts || {})
Rack::Cache::Request.new(env)
end
def mock_response(status, headers, body)
headers ||= {}
body = Array(body).compact
Rack::Cache::Response.new(status, headers, body)
end
def slurp(body)
buf = ''
body.each { |part| buf << part }
buf
end
# Stores an entry for the given request args, returns a url encoded cache key
# for the request.
def store_simple_entry(*request_args)
path, headers = request_args
@request = mock_request(path || '/test', headers || {})
@response = mock_response(200, {'Cache-Control' => 'max-age=420'}, ['test'])
body = @response.body
cache_key = @store.store(@request, @response, @entity_store)
@response.body.should.not.be.same_as body
cache_key
end
before do
@request = mock_request('/', {})
@response = mock_response(200, {}, ['hello world'])
end
after do
@store = nil
@entity_store = nil
end
# Low-level implementation methods ===========================================
it 'writes a list of negotation tuples with #write' do
lambda { @store.write('/test', [[{}, {}]]) }.should.not.raise
end
it 'reads a list of negotation tuples with #read' do
@store.write('/test', [[{},{}],[{},{}]])
tuples = @store.read('/test')
tuples.should.equal [ [{},{}], [{},{}] ]
end
it 'reads an empty list with #read when nothing cached at key' do
@store.read('/nothing').should.be.empty
end
it 'removes entries for key with #purge' do
@store.write('/test', [[{},{}]])
@store.read('/test').should.not.be.empty
@store.purge('/test')
@store.read('/test').should.be.empty
end
it 'succeeds when purging non-existing entries' do
@store.read('/test').should.be.empty
@store.purge('/test')
end
it 'returns nil from #purge' do
@store.write('/test', [[{},{}]])
@store.purge('/test').should.be.nil
@store.read('/test').should.equal []
end
%w[/test http://example.com:8080/ /test?x=y /test?x=y&p=q].each do |key|
it "can read and write key: '#{key}'" do
lambda { @store.write(key, [[{},{}]]) }.should.not.raise
@store.read(key).should.equal [[{},{}]]
end
end
it "can read and write fairly large keys" do
key = "b" * 4096
lambda { @store.write(key, [[{},{}]]) }.should.not.raise
@store.read(key).should.equal [[{},{}]]
end
it "allows custom cache keys from block" do
request = mock_request('/test', {})
request.env['rack-cache.cache_key'] =
lambda { |request| request.path_info.reverse }
@store.cache_key(request).should == 'tset/'
end
it "allows custom cache keys from class" do
request = mock_request('/test', {})
request.env['rack-cache.cache_key'] = Class.new do
def self.call(request); request.path_info.reverse end
end
@store.cache_key(request).should == 'tset/'
end
it 'does not blow up when given a non-marhsalable object with an ALL_CAPS key' do
store_simple_entry('/bad', { 'SOME_THING' => Proc.new {} })
end
# Abstract methods ===========================================================
it 'stores a cache entry' do
cache_key = store_simple_entry
@store.read(cache_key).should.not.be.empty
end
it 'sets the X-Content-Digest response header before storing' do
cache_key = store_simple_entry
req, res = @store.read(cache_key).first
res['X-Content-Digest'].should.equal 'a94a8fe5ccb19ba61c4c0873d391e987982fbbd3'
end
it 'finds a stored entry with #lookup' do
store_simple_entry
response = @store.lookup(@request, @entity_store)
response.should.not.be.nil
response.should.be.kind_of Rack::Cache::Response
end
it 'does not find an entry with #lookup when none exists' do
req = mock_request('/test', {'HTTP_FOO' => 'Foo', 'HTTP_BAR' => 'Bar'})
@store.lookup(req, @entity_store).should.be.nil
end
it "canonizes urls for cache keys" do
store_simple_entry(path='/test?x=y&p=q')
hits_req = mock_request(path, {})
miss_req = mock_request('/test?p=x', {})
@store.lookup(hits_req, @entity_store).should.not.be.nil
@store.lookup(miss_req, @entity_store).should.be.nil
end
it 'does not find an entry with #lookup when the body does not exist' do
store_simple_entry
@response.headers['X-Content-Digest'].should.not.be.nil
@entity_store.purge(@response.headers['X-Content-Digest'])
@store.lookup(@request, @entity_store).should.be.nil
end
it 'restores response headers properly with #lookup' do
store_simple_entry
response = @store.lookup(@request, @entity_store)
response.headers.
should.equal @response.headers.merge('Content-Length' => '4')
end
it 'restores response body from entity store with #lookup' do
store_simple_entry
response = @store.lookup(@request, @entity_store)
body = '' ; response.body.each {|p| body << p}
body.should.equal 'test'
end
it 'invalidates meta and entity store entries with #invalidate' do
store_simple_entry
@store.invalidate(@request, @entity_store)
response = @store.lookup(@request, @entity_store)
response.should.be.kind_of Rack::Cache::Response
response.should.not.be.fresh
end
it 'succeeds quietly when #invalidate called with no matching entries' do
req = mock_request('/test', {})
@store.invalidate(req, @entity_store)
@store.lookup(@request, @entity_store).should.be.nil
end
# Vary =======================================================================
it 'does not return entries that Vary with #lookup' do
req1 = mock_request('/test', {'HTTP_FOO' => 'Foo', 'HTTP_BAR' => 'Bar'})
req2 = mock_request('/test', {'HTTP_FOO' => 'Bling', 'HTTP_BAR' => 'Bam'})
res = mock_response(200, {'Vary' => 'Foo Bar'}, ['test'])
@store.store(req1, res, @entity_store)
@store.lookup(req2, @entity_store).should.be.nil
end
it 'stores multiple responses for each Vary combination' do
req1 = mock_request('/test', {'HTTP_FOO' => 'Foo', 'HTTP_BAR' => 'Bar'})
res1 = mock_response(200, {'Vary' => 'Foo Bar'}, ['test 1'])
key = @store.store(req1, res1, @entity_store)
req2 = mock_request('/test', {'HTTP_FOO' => 'Bling', 'HTTP_BAR' => 'Bam'})
res2 = mock_response(200, {'Vary' => 'Foo Bar'}, ['test 2'])
@store.store(req2, res2, @entity_store)
req3 = mock_request('/test', {'HTTP_FOO' => 'Baz', 'HTTP_BAR' => 'Boom'})
res3 = mock_response(200, {'Vary' => 'Foo Bar'}, ['test 3'])
@store.store(req3, res3, @entity_store)
slurp(@store.lookup(req3, @entity_store).body).should.equal 'test 3'
slurp(@store.lookup(req1, @entity_store).body).should.equal 'test 1'
slurp(@store.lookup(req2, @entity_store).body).should.equal 'test 2'
@store.read(key).length.should.equal 3
end
it 'overwrites non-varying responses with #store' do
req1 = mock_request('/test', {'HTTP_FOO' => 'Foo', 'HTTP_BAR' => 'Bar'})
res1 = mock_response(200, {'Vary' => 'Foo Bar'}, ['test 1'])
key = @store.store(req1, res1, @entity_store)
slurp(@store.lookup(req1, @entity_store).body).should.equal 'test 1'
req2 = mock_request('/test', {'HTTP_FOO' => 'Bling', 'HTTP_BAR' => 'Bam'})
res2 = mock_response(200, {'Vary' => 'Foo Bar'}, ['test 2'])
@store.store(req2, res2, @entity_store)
slurp(@store.lookup(req2, @entity_store).body).should.equal 'test 2'
req3 = mock_request('/test', {'HTTP_FOO' => 'Foo', 'HTTP_BAR' => 'Bar'})
res3 = mock_response(200, {'Vary' => 'Foo Bar'}, ['test 3'])
@store.store(req3, res3, @entity_store)
slurp(@store.lookup(req1, @entity_store).body).should.equal 'test 3'
@store.read(key).length.should.equal 2
end
end
describe 'Rack::Cache::MetaStore' do
describe 'Heap' do
before do
@store = Rack::Cache::MetaStore::Heap.new
@entity_store = Rack::Cache::EntityStore::Heap.new
end
behaves_like 'A Rack::Cache::MetaStore Implementation'
end
describe 'Disk' do
before do
@temp_dir = create_temp_directory
@store = Rack::Cache::MetaStore::Disk.new("#{@temp_dir}/meta")
@entity_store = Rack::Cache::EntityStore::Disk.new("#{@temp_dir}/entity")
end
after do
remove_entry_secure @temp_dir
end
behaves_like 'A Rack::Cache::MetaStore Implementation'
end
need_memcached 'metastore tests' do
describe 'MemCached' do
before do
@temp_dir = create_temp_directory
$memcached.flush
@store = Rack::Cache::MetaStore::MemCached.new($memcached)
@entity_store = Rack::Cache::EntityStore::Heap.new
end
behaves_like 'A Rack::Cache::MetaStore Implementation'
end
it 'passes options from uri' do
memcached = Rack::Cache::EntityStore::Dalli.resolve URI.parse("memcached://#{ENV['MEMCACHED']}?show_backtraces=true")
memcached.cache.instance_variable_get(:@options)[:show_backtraces].should.equal true
end
end
need_dalli 'metastore tests' do
describe 'Dalli' do
before do
@temp_dir = create_temp_directory
$dalli.flush_all
@store = Rack::Cache::MetaStore::Dalli.new($dalli)
@entity_store = Rack::Cache::EntityStore::Heap.new
end
behaves_like 'A Rack::Cache::MetaStore Implementation'
end
it 'passes options from uri' do
dalli = Rack::Cache::EntityStore::Dalli.resolve URI.parse("memcached://#{ENV['MEMCACHED']}?compression=true")
dalli.cache.instance_variable_get(:@options)[:compression].should.equal true
end
end
need_java 'entity store testing' do
module Rack::Cache::AppEngine
module MC
class << (Service = {})
def contains(key); include?(key); end
def get(key); self[key]; end;
def put(key, value, ttl = nil)
self[key] = value
end
end
end
end
describe 'GAEStore' do
before :each do
Rack::Cache::AppEngine::MC::Service.clear
@store = Rack::Cache::MetaStore::GAEStore.new
@entity_store = Rack::Cache::EntityStore::Heap.new
end
behaves_like 'A Rack::Cache::MetaStore Implementation'
end
end
end