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require 'spec_helper'
describe Gitlab::EtagCaching::Middleware do
let(:app) { double(:app) }
let(:middleware) { described_class.new(app) }
let(:app_status_code) { 200 }
let(:if_none_match) { nil }
let(:enabled_path) { '/gitlab-org/gitlab-ce/noteable/issue/1/notes' }
context 'when ETag caching is not enabled for current route' do
let(:path) { '/gitlab-org/gitlab-ce/tree/master/noteable/issue/1/notes' }
before do
mock_app_response
end
it 'does not add ETag header' do
_, headers, _ = middleware.call(build_env(path, if_none_match))
expect(headers['ETag']).to be_nil
end
it 'passes status code from app' do
status, _, _ = middleware.call(build_env(path, if_none_match))
expect(status).to eq app_status_code
end
end
context 'when there is no ETag in store for given resource' do
let(:path) { enabled_path }
before do
mock_app_response
mock_value_in_store(nil)
end
it 'generates ETag' do
expect_any_instance_of(Gitlab::EtagCaching::Store)
.to receive(:touch).and_return('123')
middleware.call(build_env(path, if_none_match))
end
context 'when If-None-Match header was specified' do
let(:if_none_match) { 'W/"abc"' }
it 'tracks "etag_caching_key_not_found" event' do
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_middleware_used)
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_key_not_found)
middleware.call(build_env(path, if_none_match))
end
end
end
context 'when there is ETag in store for given resource' do
let(:path) { enabled_path }
before do
mock_app_response
mock_value_in_store('123')
end
it 'returns this value as header' do
_, headers, _ = middleware.call(build_env(path, if_none_match))
expect(headers['ETag']).to eq 'W/"123"'
end
end
context 'when If-None-Match header matches ETag in store' do
let(:path) { enabled_path }
let(:if_none_match) { 'W/"123"' }
before do
mock_value_in_store('123')
end
it 'does not call app' do
expect(app).not_to receive(:call)
middleware.call(build_env(path, if_none_match))
end
it 'returns status code 304' do
status, _, _ = middleware.call(build_env(path, if_none_match))
expect(status).to eq 304
end
it 'tracks "etag_caching_cache_hit" event' do
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_middleware_used)
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_cache_hit)
middleware.call(build_env(path, if_none_match))
end
end
context 'when If-None-Match header does not match ETag in store' do
let(:path) { enabled_path }
let(:if_none_match) { 'W/"abc"' }
before do
mock_value_in_store('123')
end
it 'calls app' do
expect(app).to receive(:call).and_return([app_status_code, {}, ['body']])
middleware.call(build_env(path, if_none_match))
end
it 'tracks "etag_caching_resource_changed" event' do
mock_app_response
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_middleware_used)
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_resource_changed)
middleware.call(build_env(path, if_none_match))
end
end
context 'when If-None-Match header is not specified' do
let(:path) { enabled_path }
before do
mock_value_in_store('123')
mock_app_response
end
it 'tracks "etag_caching_header_missing" event' do
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_middleware_used)
expect(Gitlab::Metrics).to receive(:add_event)
.with(:etag_caching_header_missing)
middleware.call(build_env(path, if_none_match))
end
end
def mock_app_response
allow(app).to receive(:call).and_return([app_status_code, {}, ['body']])
end
def mock_value_in_store(value)
allow_any_instance_of(Gitlab::EtagCaching::Store)
.to receive(:get).and_return(value)
end
def build_env(path, if_none_match)
{
'PATH_INFO' => path,
'HTTP_IF_NONE_MATCH' => if_none_match
}
end
end
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