Context handling and tests cleanup + simple test kube_namespace context test

app/models/project_services/prometheus_service.rb

@@ -75,6 +75,11 @@ class PrometheusService < MonitoringService
     with_reactive_cache(Gitlab::Prometheus::Queries::MatchedMetricsQuery.name, &:itself)
   end
 
+  def with_reactive_cache(name, *args, &block)
+    vals = args.map(&:to_s)
+    yield calculate_reactive_cache(name, *vals)
+  end
+
   # Cache metrics for specific environment
   def calculate_reactive_cache(query_class_name, *args)
     return unless active? && project && !project.pending_delete?

lib/gitlab/prometheus/queries/query_additional_metrics.rb

@@ -42,15 +42,17 @@ module Gitlab
         end
 
         def process_query(context, query)
-          query_with_result = query.dup
+          query = query.dup
           result =
             if query.key?(:query_range)
-              client_query_range(query[:query_range] % context, start: context[:timeframe_start], stop: context[:timeframe_end])
+              query[:query_range] %= context
+              client_query_range(query[:query_range], start: context[:timeframe_start], stop: context[:timeframe_end])
             else
-              client_query(query[:query] % context, time: context[:timeframe_end])
+              query[:query] %= context
+              client_query(query[:query], time: context[:timeframe_end])
             end
-          query_with_result[:result] = result&.map(&:deep_symbolize_keys)
-          query_with_result
+          query[:result] = result&.map(&:deep_symbolize_keys)
+          query
         end
 
         def available_metrics
@@ -69,15 +71,11 @@ module Gitlab
         end
 
         def common_query_context(environment)
-          variables = {
+          {
             ci_environment_slug: environment.slug,
-            kube_namespace: environment.project.kubernetes_service.actual_namespace,
-          }.flat_map { |k, v| [[k, v], [k.upcase, v]] }.to_h
-
-          macros = {
+            kube_namespace: environment.project.kubernetes_service&.actual_namespace || '',
             environment_filter: %{container_name!="POD",environment="#{environment.slug}"}
           }
-          variables.merge(macros)
         end
       end
     end

spec/lib/gitlab/prometheus/queries/additional_metrics_deployment_query_spec.rb

 require 'spec_helper'
 
 describe Gitlab::Prometheus::Queries::AdditionalMetricsDeploymentQuery do
-  include Prometheus::MetricBuilders
-
-  let(:client) { double('prometheus_client') }
-  let(:environment) { create(:environment, slug: 'environment-slug') }
-  let(:deployment) { create(:deployment, environment: environment) }
-
-  subject(:query_result) { described_class.new(client).query(deployment.id) }
-
   around do |example|
     Timecop.freeze(Time.local(2008, 9, 1, 12, 0, 0)) { example.run }
   end
 
   include_examples 'additional metrics query' do
+    let(:deployment) { create(:deployment, environment: environment) }
+    let(:query_params) { [deployment.id] }
+
     it 'queries using specific time' do
       expect(client).to receive(:query_range).with(anything,
                                                    start: (deployment.created_at - 30.minutes).to_f,

spec/lib/gitlab/prometheus/queries/additional_metrics_environment_query_spec.rb

 require 'spec_helper'
 
 describe Gitlab::Prometheus::Queries::AdditionalMetricsEnvironmentQuery do
-  include Prometheus::MetricBuilders
-
-  let(:client) { double('prometheus_client') }
-  let(:environment) { create(:environment, slug: 'environment-slug') }
-
-  subject(:query_result) { described_class.new(client).query(environment.id) }
-
   around do |example|
     Timecop.freeze { example.run }
   end
 
   include_examples 'additional metrics query' do
+    let(:query_result) { described_class.new(client).query(environment.id) }
+    let(:query_params) { [environment.id] }
+
     it 'queries using specific time' do
       expect(client).to receive(:query_range).with(anything, start: 8.hours.ago.to_f, stop: Time.now.to_f)
       expect(query_result).not_to be_nil

spec/support/prometheus/additional_metrics_shared_examples.rb

@@ -10,12 +10,39 @@ RSpec.shared_examples 'additional metrics query' do
     [{ 'metric': {}, 'values': [[1488758662.506, '0.00002996364761904785'], [1488758722.506, '0.00003090239047619091']] }]
   end
 
+  let(:client) { double('prometheus_client') }
+  let(:environment) { create(:environment, slug: 'environment-slug') }
+
   before do
     allow(client).to receive(:label_values).and_return(metric_names)
     allow(metric_group_class).to receive(:all).and_return([simple_metric_group(metrics: [simple_metric])])
   end
 
+  context 'metrics rendering' do
+    subject! { described_class.new(client) }
+
+    before do
+
+    end
+
+    describe 'project has kubernetes service' do
+      let(:project) { create(:kubernetes_project) }
+      let(:environment) { create(:environment, slug: 'environment-slug', project: project)  }
+      let(:kube_namespace) { project.kubernetes_service.actual_namespace }
+
+      it 'query context contains kube namespace' do
+        expect(subject).to receive(:query_metrics).with(
+          hash_including(
+            kube_namespace: kube_namespace)
+        )
+        subject.query(*query_params)
+      end
+    end
+  end
+
   context 'with one group where two metrics is found' do
+    let(:query_result) { described_class.new(client).query(*query_params) }
+
     before do
       allow(metric_group_class).to receive(:all).and_return([simple_metric_group])
     end
@@ -50,7 +77,9 @@ RSpec.shared_examples 'additional metrics query' do
   end
 
   context 'with two groups with one metric each' do
+    let(:query_result) { described_class.new(client).query(*query_params) }
     let(:metrics) { [simple_metric(queries: [simple_query])] }
+
     before do
       allow(metric_group_class).to receive(:all).and_return(
         [