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| 1 | +/* |
| 2 | +Copyright 2023 The Kubernetes Authors. |
| 3 | +
|
| 4 | +Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | +you may not use this file except in compliance with the License. |
| 6 | +You may obtain a copy of the License at |
| 7 | +
|
| 8 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | +
|
| 10 | +Unless required by applicable law or agreed to in writing, software |
| 11 | +distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | +See the License for the specific language governing permissions and |
| 14 | +limitations under the License. |
| 15 | +*/ |
| 16 | + |
| 17 | +package kgateway |
| 18 | + |
| 19 | +import ( |
| 20 | + "github.com/kgateway-dev/ingress2gateway/pkg/i2gw/intermediate" |
| 21 | + kgw "github.com/kgateway-dev/kgateway/v2/api/v1alpha1/kgateway" |
| 22 | + |
| 23 | + "k8s.io/apimachinery/pkg/types" |
| 24 | + gwv1 "sigs.k8s.io/gateway-api/apis/v1" |
| 25 | +) |
| 26 | + |
| 27 | +// applyBackendProtocol projects backend protocol metadata on IR Backends into |
| 28 | +// typed Kgateway Backend CRs and rewrites HTTPRoute backendRefs to reference |
| 29 | +// those Backends. |
| 30 | +// |
| 31 | +// Semantics: |
| 32 | +// - For each Policy.Backends entry produced by the ingress-nginx provider, |
| 33 | +// we ensure there is a Static Backend CR with the correct host / port and |
| 34 | +// (if set) appProtocol (currently only gRPC). |
| 35 | +// - HTTPRoute backendRefs that were originally core Services and are covered |
| 36 | +// by this Policy are rewritten to: |
| 37 | +// group: gateway.kgateway.dev |
| 38 | +// kind: Backend |
| 39 | +// name: <svc>-service-upstream |
| 40 | +// - This works regardless of whether service-upstream was also used. |
| 41 | +func applyBackendProtocol( |
| 42 | + pol intermediate.Policy, |
| 43 | + ingressName string, |
| 44 | + httpRouteKey types.NamespacedName, |
| 45 | + httpRouteCtx *intermediate.HTTPRouteContext, |
| 46 | + backends map[types.NamespacedName]*kgw.Backend, |
| 47 | +) { |
| 48 | + if len(pol.Backends) == 0 || len(pol.RuleBackendSources) == 0 { |
| 49 | + return |
| 50 | + } |
| 51 | + |
| 52 | + for _, idx := range pol.RuleBackendSources { |
| 53 | + if idx.Rule >= len(httpRouteCtx.Spec.Rules) { |
| 54 | + continue |
| 55 | + } |
| 56 | + rule := &httpRouteCtx.Spec.Rules[idx.Rule] |
| 57 | + if idx.Backend >= len(rule.BackendRefs) { |
| 58 | + continue |
| 59 | + } |
| 60 | + |
| 61 | + br := &rule.BackendRefs[idx.Backend] |
| 62 | + |
| 63 | + // Only core Service backends. |
| 64 | + if br.BackendRef.Group != nil && *br.BackendRef.Group != "" { |
| 65 | + continue |
| 66 | + } |
| 67 | + if br.BackendRef.Kind != nil && *br.BackendRef.Kind != "Service" { |
| 68 | + continue |
| 69 | + } |
| 70 | + if br.BackendRef.Name == "" { |
| 71 | + continue |
| 72 | + } |
| 73 | + |
| 74 | + svcName := string(br.BackendRef.Name) |
| 75 | + if svcName == "" { |
| 76 | + continue |
| 77 | + } |
| 78 | + |
| 79 | + backendKey := backendKeyForService(httpRouteKey.Namespace, svcName) |
| 80 | + |
| 81 | + be, ok := pol.Backends[backendKey] |
| 82 | + if !ok { |
| 83 | + // Provider did not produce metadata for this Service backend. |
| 84 | + continue |
| 85 | + } |
| 86 | + |
| 87 | + // Ensure / create the typed Backend CR (host, port, protocol). |
| 88 | + kb := ensureStaticBackendForService( |
| 89 | + ingressName, |
| 90 | + httpRouteKey, |
| 91 | + svcName, |
| 92 | + be.Host, |
| 93 | + be.Port, |
| 94 | + be.Protocol, |
| 95 | + backends, |
| 96 | + ) |
| 97 | + |
| 98 | + // Rewrite BackendRef to point to this Backend. |
| 99 | + group := gwv1.Group(BackendGVK.Group) |
| 100 | + kind := gwv1.Kind(BackendGVK.Kind) |
| 101 | + |
| 102 | + br.BackendRef.Group = &group |
| 103 | + br.BackendRef.Kind = &kind |
| 104 | + br.BackendRef.Name = gwv1.ObjectName(kb.Name) |
| 105 | + // Backend controls the port. |
| 106 | + br.BackendRef.Port = nil |
| 107 | + } |
| 108 | +} |
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