Fix reactive cache handling in NetworkPoliciesController#summary

Reactive cache flow goes through the background worker which causes
arguments to the PacketFlowQuery to be stringified. This causes
reactive cache worker to use a different cache key from the one used
by the web process, as a result background worker will not re-calc
cache. This patch converts PacketFlowQuery to use arguments that will
work consistently for both flows. This patch also updates controller
to send :accepted on initial caching request to improve frontend
polling logic.

ee/app/controllers/projects/security/network_policies_controller.rb

@@ -16,15 +16,19 @@ module Projects
 
         result = adapter.query(
           :packet_flow, environment.deployment_namespace,
-          interval: params[:interval] || "minute",
-          from:     (Time.parse(params[:from]) rescue 1.hour.ago),
-          to:       (Time.parse(params[:to]) rescue Time.now)
-        ) || {}
+          params[:interval] || "minute",
+          (Time.parse(params[:from]) rescue 1.hour.ago).to_s,
+          (Time.parse(params[:to]) rescue Time.now).to_s
+        )
 
         respond_to do |format|
           format.json do
+            if result
               status = result[:success] ? :ok : :bad_request
               render status: status, json: result[:data]
+            else
+              render status: :accepted, json: {}
+            end
           end
         end
       end

ee/lib/gitlab/prometheus/queries/packet_flow_query.rb

@@ -7,7 +7,9 @@ module Gitlab
         FORWARDED = "FORWARDED".freeze
         DROPPED   = "DROPPED".freeze
 
-        def query(namespace, interval: "hour", from: 1.day.ago, to: Time.now)
+        def query(namespace, interval = "hour", from = 1.day.ago.to_s, to = Time.now.to_s)
+          from = Time.parse(from)
+          to = Time.parse(to)
           rate_interval = to_prometheus_interval(interval)
           increase_interval = (to - from).to_i
 

ee/spec/controllers/projects/security/network_policies_controller_spec.rb

@@ -40,7 +40,7 @@ describe Projects::Security::NetworkPoliciesController do
           Timecop.freeze do
             expect(adapter).to(
               receive(:query)
-                .with(:packet_flow, kubernetes_namespace, interval: "minute", from: 1.hour.ago, to: Time.now)
+                .with(:packet_flow, kubernetes_namespace, "minute", 1.hour.ago.to_s, Time.now.to_s)
                 .and_return({ success: true, data: { ops_rate: [[Time.at(0).to_i, 10]], ops_total: 10 } })
             )
             subject
@@ -62,7 +62,7 @@ describe Projects::Security::NetworkPoliciesController do
           it 'queries with requested arguments' do
             expect(adapter).to(
               receive(:query)
-                .with(:packet_flow, kubernetes_namespace, interval: "day", from: Time.at(0), to: Time.at(100))
+                .with(:packet_flow, kubernetes_namespace, "day", Time.at(0).to_s, Time.at(100).to_s)
                 .and_return({ success: true, data: {} })
             )
             subject
@@ -81,7 +81,7 @@ describe Projects::Security::NetworkPoliciesController do
             Timecop.freeze do
               expect(adapter).to(
                 receive(:query)
-                  .with(:packet_flow, kubernetes_namespace, interval: "minute", from: 1.hour.ago, to: Time.now)
+                  .with(:packet_flow, kubernetes_namespace, "minute", 1.hour.ago.to_s, Time.now.to_s)
                   .and_return({ success: true, data: {} })
               )
               subject
@@ -90,11 +90,11 @@ describe Projects::Security::NetworkPoliciesController do
         end
 
         context 'with nil results' do
-          it 'returns network policies summary' do
+          it 'responds with accepted' do
             allow(adapter).to receive(:query).and_return(nil)
             subject
 
-            expect(response).to have_gitlab_http_status(:bad_request)
+            expect(response).to have_gitlab_http_status(:accepted)
           end
         end
       end

ee/spec/lib/gitlab/prometheus/queries/packet_flow_query_spec.rb

@@ -70,7 +70,7 @@ describe Gitlab::Prometheus::Queries::PacketFlowQuery do
                   ' or on(source,destination,verdict) ' \
                   "rate(hubble_flows_processed_total{source=\"query-12345678-production\"}[#{value}]))"
           expect(client).to receive(:query_range).with(query, any_args)
-          subject.query(namespace, interval: interval)
+          subject.query(namespace, interval)
         end
       end
     end
@@ -83,7 +83,7 @@ describe Gitlab::Prometheus::Queries::PacketFlowQuery do
     context 'ops_rate query' do
       it 'sets query time range' do
         expect(client).to receive(:query_range).with(anything, start_time: from, end_time: to)
-        subject.query(namespace, from: from, to: to)
+        subject.query(namespace, 'hour', from.to_s, to.to_s)
       end
     end
 
@@ -94,7 +94,7 @@ describe Gitlab::Prometheus::Queries::PacketFlowQuery do
                 ' or on(source,destination,verdict) ' \
                 'increase(hubble_flows_processed_total{source="query-12345678-production"}[100s]))'
         expect(client).to receive(:query).with(query, time: to)
-        subject.query(namespace, from: from, to: to)
+        subject.query(namespace, 'hour', from.to_s, to.to_s)
       end
     end
   end