feat: support GEP-1731

internal/gatewayapi/route.go

@@ -271,6 +271,11 @@ func (t *Translator) processHTTPRouteRules(httpRoute *HTTPRouteContext, parentRe
 	return routeRoutes, nil
 }
 
+func processRouteTrafficFeatures(irRoute *ir.HTTPRoute, rule gwapiv1.HTTPRouteRule) {
+	processRouteTimeout(irRoute, rule)
+	processRouteRetry(irRoute, rule)
+}
+
 func processRouteTimeout(irRoute *ir.HTTPRoute, rule gwapiv1.HTTPRouteRule) {
 	if rule.Timeouts != nil {
 		if rule.Timeouts.Request != nil {
@@ -293,6 +298,45 @@ func processRouteTimeout(irRoute *ir.HTTPRoute, rule gwapiv1.HTTPRouteRule) {
 	}
 }
 
+func processRouteRetry(irRoute *ir.HTTPRoute, rule gwapiv1.HTTPRouteRule) {
+	if rule.Retry == nil {
+		return
+	}
+
+	retry := rule.Retry
+	res := &ir.Retry{}
+	if retry.Attempts != nil {
+		res.NumRetries = ptr.To(uint32(*retry.Attempts))
+	}
+	if retry.Backoff != nil {
+		backoff, err := time.ParseDuration(string(*retry.Backoff))
+		if err == nil {
+			res.PerRetry = &ir.PerRetryPolicy{
+				BackOff: &ir.BackOffPolicy{
+					BaseInterval: ptr.To(metav1.Duration{Duration: backoff}),
+				},
+			}
+			// xref: https://gateway-api.sigs.k8s.io/geps/gep-1742/#timeout-values
+			if rule.Timeouts != nil && rule.Timeouts.BackendRequest != nil {
+				backendRequestTimeout, err := time.ParseDuration(string(*rule.Timeouts.BackendRequest))
+				if err == nil {
+					res.PerRetry.Timeout = &metav1.Duration{Duration: backendRequestTimeout}
+				}
+			}
+		}
+	}
+	if len(retry.Codes) > 0 {
+		codes := make([]ir.HTTPStatus, 0, len(retry.Codes))
+		for _, code := range retry.Codes {
+			codes = append(codes, ir.HTTPStatus(code))
+		}
+		res.RetryOn = &ir.RetryOn{
+			HTTPStatusCodes: codes,
+		}
+	}
+	irRoute.Retry = res
+}
+
 func (t *Translator) processHTTPRouteRule(httpRoute *HTTPRouteContext, ruleIdx int, httpFiltersContext *HTTPFiltersContext, rule gwapiv1.HTTPRouteRule) ([]*ir.HTTPRoute, error) {
 	var ruleRoutes []*ir.HTTPRoute
 
@@ -302,7 +346,7 @@ func (t *Translator) processHTTPRouteRule(httpRoute *HTTPRouteContext, ruleIdx i
 			Name: irRouteName(httpRoute, ruleIdx, -1),
 		}
 		irRoute.Metadata = buildRouteMetadata(httpRoute, rule.Name)
-		processRouteTimeout(irRoute, rule)
+		processRouteTrafficFeatures(irRoute, rule)
 		applyHTTPFiltersContextToIRRoute(httpFiltersContext, irRoute)
 		ruleRoutes = append(ruleRoutes, irRoute)
 	}
@@ -363,7 +407,7 @@ func (t *Translator) processHTTPRouteRule(httpRoute *HTTPRouteContext, ruleIdx i
 			SessionPersistence: sessionPersistence,
 		}
 		irRoute.Metadata = buildRouteMetadata(httpRoute, rule.Name)
-		processRouteTimeout(irRoute, rule)
+		processRouteTrafficFeatures(irRoute, rule)
 
 		if match.Path != nil {
 			switch PathMatchTypeDerefOr(match.Path.Type, gwapiv1.PathMatchPathPrefix) {
@@ -751,11 +795,7 @@ func (t *Translator) processHTTPRouteParentRefListener(route RouteContext, route
 					IsHTTP2:               routeRoute.IsHTTP2,
 					SessionPersistence:    routeRoute.SessionPersistence,
 					Timeout:               routeRoute.Timeout,
-				}
-				if routeRoute.Traffic != nil {
-					hostRoute.Traffic = &ir.TrafficFeatures{
-						Retry: routeRoute.Traffic.Retry,
-					}
+					Retry:                 routeRoute.Retry,
 				}
 				perHostRoutes = append(perHostRoutes, hostRoute)
 			}

internal/gatewayapi/testdata/httproute-retry.in.yaml

@@ -0,0 +1,100 @@
+gateways:
+- apiVersion: gateway.networking.k8s.io/v1
+  kind: Gateway
+  metadata:
+    namespace: envoy-gateway
+    name: gateway-1
+  spec:
+    gatewayClassName: envoy-gateway-class
+    listeners:
+    - name: http
+      protocol: HTTP
+      port: 80
+      allowedRoutes:
+        namespaces:
+          from: All
+- apiVersion: gateway.networking.k8s.io/v1
+  kind: Gateway
+  metadata:
+    namespace: envoy-gateway
+    name: gateway-2
+  spec:
+    gatewayClassName: envoy-gateway-class
+    listeners:
+    - name: http
+      protocol: HTTP
+      port: 80
+      allowedRoutes:
+        namespaces:
+          from: All
+httpRoutes:
+- apiVersion: gateway.networking.k8s.io/v1
+  kind: HTTPRoute
+  metadata:
+    namespace: default
+    name: httproute-1
+  spec:
+    hostnames:
+    - gateway.envoyproxy.io
+    parentRefs:
+    - namespace: envoy-gateway
+      name: gateway-2
+      sectionName: http
+    rules:
+    - matches:
+      - path:
+          value: "/"
+      retry:
+        codes:
+        - 500
+        attempts: 3
+        backoff: 200ms
+      timeouts:
+        backendRequest: 3s
+      backendRefs:
+      - name: service-1
+        port: 8080
+backendTrafficPolicies:
+- apiVersion: gateway.envoyproxy.io/v1alpha1
+  kind: BackendTrafficPolicy
+  metadata:
+    namespace: envoy-gateway
+    name: policy-for-gateway
+  spec:
+    targetRef:
+      group: gateway.networking.k8s.io
+      kind: Gateway
+      name: gateway-1
+    retry:
+      retryOn:
+        triggers:
+        - cancelled
+      perRetry:
+        timeout: 250ms
+        backoff:
+          baseInterval: 100ms
+          maxInterval: 10s
+- apiVersion: gateway.envoyproxy.io/v1alpha1
+  kind: BackendTrafficPolicy
+  metadata:
+    namespace: default
+    name: policy-for-route
+  spec:
+    targetRef:
+      group: gateway.networking.k8s.io
+      kind: HTTPRoute
+      name: httproute-1
+    retry:
+      numRetries: 5
+      retryOn:
+        httpStatusCodes:
+        - 429
+        - 503
+        triggers:
+        - connect-failure
+        - retriable-status-codes
+      perRetry:
+        timeout: 250ms
+        backoff:
+          baseInterval: 100ms
+          maxInterval: 10s