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Move MergeIR into intermediate package.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| /* | ||
| Copyright 2024 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package intermediate | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "maps" | ||
|
|
||
| "k8s.io/apimachinery/pkg/types" | ||
| "k8s.io/apimachinery/pkg/util/validation/field" | ||
| gatewayv1 "sigs.k8s.io/gateway-api/apis/v1" | ||
| gatewayv1alpha2 "sigs.k8s.io/gateway-api/apis/v1alpha2" | ||
| gatewayv1beta1 "sigs.k8s.io/gateway-api/apis/v1beta1" | ||
| ) | ||
|
|
||
| // MergeIRs accepts multiple IRs and creates a unique IR struct built | ||
| // as follows: | ||
| // - GatewayClasses, Routes, and ReferenceGrants are grouped into the same maps | ||
| // - Gateways may have the same NamespaceName even if they come from different | ||
| // ingresses, as they have a their GatewayClass' name as name. For this reason, | ||
| // if there are mutiple gateways named the same, their listeners are merged into | ||
| // a unique Gateway. | ||
| // | ||
| // This behavior is likely to change after https://github.com/kubernetes-sigs/gateway-api/pull/1863 takes place. | ||
| func MergeIRs(irs ...IR) (IR, field.ErrorList) { | ||
| mergedIRs := IR{ | ||
| Gateways: make(map[types.NamespacedName]GatewayContext), | ||
| GatewayClasses: make(map[types.NamespacedName]gatewayv1.GatewayClass), | ||
| HTTPRoutes: make(map[types.NamespacedName]HTTPRouteContext), | ||
| Services: make(map[types.NamespacedName]ProviderSpecificServiceIR), | ||
| TLSRoutes: make(map[types.NamespacedName]gatewayv1alpha2.TLSRoute), | ||
| TCPRoutes: make(map[types.NamespacedName]gatewayv1alpha2.TCPRoute), | ||
| UDPRoutes: make(map[types.NamespacedName]gatewayv1alpha2.UDPRoute), | ||
| ReferenceGrants: make(map[types.NamespacedName]gatewayv1beta1.ReferenceGrant), | ||
| } | ||
| var errs field.ErrorList | ||
| mergedIRs.Gateways, errs = mergeGatewayContexts(irs) | ||
| if len(errs) > 0 { | ||
| return IR{}, errs | ||
| } | ||
| // TODO(issue #189): Perform merge on HTTPRoute and Service like Gateway. | ||
| for _, gr := range irs { | ||
| maps.Copy(mergedIRs.GatewayClasses, gr.GatewayClasses) | ||
| maps.Copy(mergedIRs.HTTPRoutes, gr.HTTPRoutes) | ||
| maps.Copy(mergedIRs.Services, gr.Services) | ||
| maps.Copy(mergedIRs.TLSRoutes, gr.TLSRoutes) | ||
| maps.Copy(mergedIRs.TCPRoutes, gr.TCPRoutes) | ||
| maps.Copy(mergedIRs.UDPRoutes, gr.UDPRoutes) | ||
| maps.Copy(mergedIRs.ReferenceGrants, gr.ReferenceGrants) | ||
| } | ||
| return mergedIRs, errs | ||
| } | ||
|
|
||
| func mergeGatewayContexts(irs []IR) (map[types.NamespacedName]GatewayContext, field.ErrorList) { | ||
| newGatewayContexts := make(map[types.NamespacedName]GatewayContext) | ||
| errs := field.ErrorList{} | ||
|
|
||
| for _, currentIR := range irs { | ||
| for _, g := range currentIR.Gateways { | ||
| nn := types.NamespacedName{Namespace: g.Gateway.Namespace, Name: g.Gateway.Name} | ||
| if existingGatewayContext, ok := newGatewayContexts[nn]; ok { | ||
| g.Gateway.Spec.Listeners = append(g.Gateway.Spec.Listeners, existingGatewayContext.Gateway.Spec.Listeners...) | ||
| g.Gateway.Spec.Addresses = append(g.Gateway.Spec.Addresses, existingGatewayContext.Gateway.Spec.Addresses...) | ||
| g.ProviderSpecificIR = mergedGatewayIR(g.ProviderSpecificIR, existingGatewayContext.ProviderSpecificIR) | ||
| } | ||
| newGatewayContexts[nn] = GatewayContext{Gateway: g.Gateway} | ||
| // 64 is the maximum number of listeners a Gateway can have | ||
| if len(g.Spec.Listeners) > 64 { | ||
| fieldPath := field.NewPath(fmt.Sprintf("%s/%s", nn.Namespace, nn.Name)).Child("spec").Child("listeners") | ||
| errs = append(errs, field.Invalid(fieldPath, g, "error while merging gateway listeners: a gateway cannot have more than 64 listeners")) | ||
| } | ||
| // 16 is the maximum number of addresses a Gateway can have | ||
| if len(g.Spec.Addresses) > 16 { | ||
| fieldPath := field.NewPath(fmt.Sprintf("%s/%s", nn.Namespace, nn.Name)).Child("spec").Child("addresses") | ||
| errs = append(errs, field.Invalid(fieldPath, g, "error while merging gateway listeners: a gateway cannot have more than 16 addresses")) | ||
| } | ||
| } | ||
| } | ||
| return newGatewayContexts, errs | ||
| } | ||
|
|
||
| func mergedGatewayIR(current, existing ProviderSpecificGatewayIR) ProviderSpecificGatewayIR { | ||
| var mergedGatewayIR ProviderSpecificGatewayIR | ||
| // TODO(issue #190): Find a different way to merge GatewayIR, instead of | ||
| // delegating them to each provider. | ||
| mergedGatewayIR.Gce = mergeGceGatewayIR(current.Gce, existing.Gce) | ||
| return mergedGatewayIR | ||
| } |