gatewayapi: add support for b/g mirroring

docs/gitbook/tutorials/gatewayapi-progressive-delivery.md

@@ -622,5 +622,90 @@ Events:
   Normal   Synced  5s    flagger  Promotion completed! Scaling down podinfo.test
 ```
 
+## Traffic mirroring
+
+![Flagger Canary Traffic Shadowing](https://raw.githubusercontent.com/fluxcd/flagger/main/docs/diagrams/flagger-canary-traffic-mirroring.png)
+
+For applications that perform read operations, Flagger can be configured to do B/G tests with traffic mirroring.
+Gateway API traffic mirroring will copy each incoming request, sending one request to the primary and one to the canary service.
+The response from the primary is sent back to the user and the response from the canary is discarded.
+Metrics are collected on both requests so that the deployment will only proceed if the canary metrics are within the threshold values.
+
+Note that mirroring should be used for requests that are **idempotent** or capable of being processed twice \(once by the primary and once by the canary\).
+
+You can enable mirroring by replacing `stepWeight` with `iterations` and by setting `analysis.mirror` to `true`:
+
+```yaml
+apiVersion: flagger.app/v1beta1
+kind: Canary
+metadata:
+  name: podinfo
+  namespace: test
+spec:
+  # deployment reference
+  targetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: podinfo
+  service:
+    # service port number
+    port: 9898
+    # container port number or name (optional)
+    targetPort: 9898
+    # Gateway API HTTPRoute host names
+    hosts:
+     - localproject.contour.io
+    # Reference to the Gateway that the generated HTTPRoute would attach to.
+    gatewayRefs:
+      - name: contour
+        namespace: projectcontour
+  analysis:
+    # schedule interval
+    interval: 1m
+    # max number of failed metric checks before rollback
+    threshold: 5
+    # total number of iterations
+    iterations: 10
+    # enable traffic shadowing
+    mirror: true
+    # Gateway API HTTPRoute host names
+    metrics:
+      - name: request-success-rate
+        thresholdRange:
+          min: 99
+        interval: 1m
+      - name: request-duration
+        thresholdRange:
+          max: 500
+        interval: 1m
+    webhooks:
+      - name: load-test
+        url: http://flagger-loadtester.test/
+        timeout: 5s
+        metadata:
+          cmd: "hey -z 2m -q 10 -c 2 -host localproject.contour.io http://envoy.projectcontour/"
+```
+
+With the above configuration, Flagger will run a canary release with the following steps:
+
+* detect new revision \(deployment spec, secrets or configmaps changes\)
+* scale from zero the canary deployment
+* wait for the HPA to set the canary minimum replicas
+* check canary pods health
+* run the acceptance tests
+* abort the canary release if tests fail
+* start the load tests
+* mirror 100% of the traffic from primary to canary
+* check request success rate and request duration every minute
+* abort the canary release if the metrics check failure threshold is reached
+* stop traffic mirroring after the number of iterations is reached
+* route live traffic to the canary pods
+* promote the canary \(update the primary secrets, configmaps and deployment spec\)
+* wait for the primary deployment rollout to finish
+* wait for the HPA to set the primary minimum replicas
+* check primary pods health
+* switch live traffic back to primary
+* scale to zero the canary
+* send notification with the canary analysis result
 
 The above procedures can be extended with [custom metrics](../usage/metrics.md) checks, [webhooks](../usage/webhooks.md), [manual promotion](../usage/webhooks.md#manual-gating) approval and [Slack or MS Teams](../usage/alerting.md) notifications.

docs/gitbook/usage/deployment-strategies.md

@@ -9,7 +9,7 @@ Flagger can run automated application analysis, promotion and rollback for the f
 * **Blue/Green** \(traffic switching\)
   * Kubernetes CNI, Istio, Linkerd, App Mesh, NGINX, Contour, Gloo Edge, Open Service Mesh, Gateway API
 * **Blue/Green Mirroring** \(traffic shadowing\)
-  * Istio
+  * Istio, Gateway API
 * **Canary Release with Session Affinity** \(progressive traffic shifting combined with cookie based routing\)
   * Istio, Gateway API
 
@@ -353,8 +353,6 @@ you should consider what will happen if a write is duplicated and handled by the
 
 To use mirroring, set `spec.analysis.mirror` to `true`.
 
-Istio example:
-
 ```yaml
   analysis:
     # schedule interval (default 60s)
@@ -363,9 +361,10 @@ Istio example:
     iterations: 10
     # max number of failed iterations before rollback
     threshold: 2
-    # Traffic shadowing (compatible with Istio only)
+    # Traffic shadowing
     mirror: true
     # Weight of the traffic mirrored to your canary (defaults to 100%)
+    # Only applicable for Istio.
     mirrorWeight: 100
 ```
 

pkg/router/gateway_api_v1beta1.go

@@ -187,6 +187,16 @@ func (gwr *GatewayAPIV1Beta1Router) Reconcile(canary *flaggerv1.Canary) error {
 		ignoreCmpOptions = append(ignoreCmpOptions, cmpopts.IgnoreFields(v1beta1.HTTPBackendRef{}, "Filters"))
 	}
 
+	if canary.GetAnalysis().Mirror {
+		// If a Canary run is in progress, the HTTPRoute rule will have an extra filter of type RequestMirror
+		// which needs to be ignored so that the requests are mirrored to the canary deployment.
+		inProgress := canary.Status.Phase == flaggerv1.CanaryPhaseWaiting || canary.Status.Phase == flaggerv1.CanaryPhaseProgressing ||
+			canary.Status.Phase == flaggerv1.CanaryPhaseWaitingPromotion
+		if inProgress {
+			ignoreCmpOptions = append(ignoreCmpOptions, cmpopts.IgnoreFields(v1beta1.HTTPRouteRule{}, "Filters"))
+		}
+	}
+
 	if httpRoute != nil {
 		specDiff := cmp.Diff(
 			httpRoute.Spec, httpRouteSpec,
@@ -249,6 +259,12 @@ func (gwr *GatewayAPIV1Beta1Router) GetRoutes(canary *flaggerv1.Canary) (
 				}
 			}
 		}
+		for _, filter := range rule.Filters {
+			if filter.Type == v1beta1.HTTPRouteFilterRequestMirror && filter.RequestMirror != nil &&
+				string(filter.RequestMirror.BackendRef.Name) == canarySvcName {
+				mirrored = true
+			}
+		}
 	}
 
 	if weightedRule != nil {
@@ -307,6 +323,23 @@ func (gwr *GatewayAPIV1Beta1Router) SetRoutes(
 			},
 		},
 	}
+
+	// If B/G mirroring is enabled, then add a route filter which mirrors the traffic
+	// to the canary service.
+	if mirrored && canary.GetAnalysis().Iterations > 0 {
+		weightedRouteRule.Filters = append(weightedRouteRule.Filters, v1beta1.HTTPRouteFilter{
+			Type: v1beta1.HTTPRouteFilterRequestMirror,
+			RequestMirror: &v1beta1.HTTPRequestMirrorFilter{
+				BackendRef: v1beta1.BackendObjectReference{
+					Group: (*v1beta1.Group)(&backendRefGroup),
+					Kind:  (*v1beta1.Kind)(&backendRefKind),
+					Name:  v1beta1.ObjectName(canarySvcName),
+					Port:  (*v1beta1.PortNumber)(&canary.Spec.Service.Port),
+				},
+			},
+		})
+	}
+
 	httpRouteSpec := v1beta1.HTTPRouteSpec{
 		CommonRouteSpec: v1beta1.CommonRouteSpec{
 			ParentRefs: canary.Spec.Service.GatewayRefs,

pkg/router/gateway_api_v1beta1_test.go

@@ -233,6 +233,44 @@ func TestGatewayAPIV1Beta1Router_Routes(t *testing.T) {
 		}
 		assert.True(t, found)
 	})
+
+	t.Run("b/g mirror", func(t *testing.T) {
+		canary := mocks.canary.DeepCopy()
+		canary.Spec.Analysis.Mirror = true
+		canary.Spec.Analysis.Iterations = 5
+		_, _, cSvcName := canary.GetServiceNames()
+
+		err = router.SetRoutes(canary, 100, 0, true)
+		hr, err := mocks.meshClient.GatewayapiV1beta1().HTTPRoutes("default").Get(context.TODO(), "podinfo", metav1.GetOptions{})
+		require.NoError(t, err)
+		assert.Len(t, hr.Spec.Rules, 1)
+
+		rule := hr.Spec.Rules[0]
+		var found bool
+		for _, filter := range rule.Filters {
+			if filter.Type == v1beta1.HTTPRouteFilterRequestMirror && filter.RequestMirror != nil &&
+				string(filter.RequestMirror.BackendRef.Name) == cSvcName {
+				found = true
+			}
+		}
+		assert.True(t, found, "could not find request mirror filter in HTTPRoute")
+
+		// Mark the status as progressing to assert that request mirror filter is ignored.
+		canary.Status.Phase = flaggerv1.CanaryPhaseProgressing
+		err = router.Reconcile(canary)
+		require.NoError(t, err)
+
+		hr, err = mocks.meshClient.GatewayapiV1beta1().HTTPRoutes("default").Get(context.TODO(), "podinfo", metav1.GetOptions{})
+		require.NoError(t, err)
+		assert.Len(t, hr.Spec.Rules, 1)
+		assert.Empty(t, cmp.Diff(hr.Spec.Rules[0], rule))
+
+		err = router.SetRoutes(canary, 100, 0, false)
+		hr, err = mocks.meshClient.GatewayapiV1beta1().HTTPRoutes("default").Get(context.TODO(), "podinfo", metav1.GetOptions{})
+		require.NoError(t, err)
+		assert.Len(t, hr.Spec.Rules, 1)
+		assert.Len(t, hr.Spec.Rules[0].Filters, 0)
+	})
 }
 
 func TestGatewayAPIV1Beta1Router_getSessionAffinityRouteRules(t *testing.T) {