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|
# frozen_string_literal: true
require 'spec_helper'
describe Prometheus::ProxyService do
include ReactiveCachingHelpers
set(:project) { create(:project) }
set(:environment) { create(:environment, project: project) }
describe '#initialize' do
let(:params) { ActionController::Parameters.new(query: '1').permit! }
it 'initializes attributes' do
result = described_class.new(environment, 'GET', 'query', params)
expect(result.proxyable).to eq(environment)
expect(result.method).to eq('GET')
expect(result.path).to eq('query')
expect(result.params).to eq('query' => '1')
end
it 'converts ActionController::Parameters into hash' do
result = described_class.new(environment, 'GET', 'query', params)
expect(result.params).to be_an_instance_of(Hash)
end
context 'with unknown params' do
let(:params) { ActionController::Parameters.new(query: '1', other_param: 'val').permit! }
it 'filters unknown params' do
result = described_class.new(environment, 'GET', 'query', params)
expect(result.params).to eq('query' => '1')
end
end
end
describe '#execute' do
let(:prometheus_adapter) { instance_double(PrometheusService) }
let(:params) { ActionController::Parameters.new(query: '1').permit! }
subject { described_class.new(environment, 'GET', 'query', params) }
context 'when prometheus_adapter is nil' do
before do
allow(environment).to receive(:prometheus_adapter).and_return(nil)
end
it 'returns error' do
expect(subject.execute).to eq(
status: :error,
message: 'No prometheus server found',
http_status: :service_unavailable
)
end
end
context 'when prometheus_adapter cannot query' do
before do
allow(environment).to receive(:prometheus_adapter).and_return(prometheus_adapter)
allow(prometheus_adapter).to receive(:can_query?).and_return(false)
end
it 'returns error' do
expect(subject.execute).to eq(
status: :error,
message: 'No prometheus server found',
http_status: :service_unavailable
)
end
end
context 'cannot proxy' do
subject { described_class.new(environment, 'POST', 'garbage', params) }
it 'returns error' do
expect(subject.execute).to eq(
message: 'Proxy support for this API is not available currently',
status: :error
)
end
end
context 'with caching', :use_clean_rails_memory_store_caching do
let(:return_value) { { 'http_status' => 200, 'body' => 'body' } }
let(:opts) do
[environment.class.name, environment.id, 'GET', 'query', { 'query' => '1' }]
end
before do
allow(environment).to receive(:prometheus_adapter)
.and_return(prometheus_adapter)
allow(prometheus_adapter).to receive(:can_query?).and_return(true)
end
context 'when value present in cache' do
before do
stub_reactive_cache(subject, return_value, opts)
end
it 'returns cached value' do
result = subject.execute
expect(result[:http_status]).to eq(return_value[:http_status])
expect(result[:body]).to eq(return_value[:body])
end
end
context 'when value not present in cache' do
it 'returns nil' do
expect(ReactiveCachingWorker)
.to receive(:perform_async)
.with(subject.class, subject.id, *opts)
result = subject.execute
expect(result).to eq(nil)
end
end
end
context 'call prometheus api' do
let(:prometheus_client) { instance_double(Gitlab::PrometheusClient) }
before do
synchronous_reactive_cache(subject)
allow(environment).to receive(:prometheus_adapter)
.and_return(prometheus_adapter)
allow(prometheus_adapter).to receive(:can_query?).and_return(true)
allow(prometheus_adapter).to receive(:prometheus_client)
.and_return(prometheus_client)
end
context 'connection to prometheus server succeeds' do
let(:rest_client_response) { instance_double(RestClient::Response) }
let(:prometheus_http_status_code) { 400 }
let(:response_body) do
'{"status":"error","errorType":"bad_data","error":"parse error at char 1: no expression found in input"}'
end
before do
allow(prometheus_client).to receive(:proxy).and_return(rest_client_response)
allow(rest_client_response).to receive(:code)
.and_return(prometheus_http_status_code)
allow(rest_client_response).to receive(:body).and_return(response_body)
end
it 'returns the http status code and body from prometheus' do
expect(subject.execute).to eq(
http_status: prometheus_http_status_code,
body: response_body,
status: :success
)
end
end
context 'connection to prometheus server fails' do
context 'prometheus client raises Gitlab::PrometheusClient::Error' do
before do
allow(prometheus_client).to receive(:proxy)
.and_raise(Gitlab::PrometheusClient::Error, 'Network connection error')
end
it 'returns error' do
expect(subject.execute).to eq(
status: :error,
message: 'Network connection error',
http_status: :service_unavailable
)
end
end
end
end
end
describe '.from_cache' do
it 'initializes an instance of ProxyService class' do
result = described_class.from_cache(
environment.class.name, environment.id, 'GET', 'query', { 'query' => '1' }
)
expect(result).to be_an_instance_of(described_class)
expect(result.proxyable).to eq(environment)
expect(result.method).to eq('GET')
expect(result.path).to eq('query')
expect(result.params).to eq('query' => '1')
end
end
end
|
