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[WIP] Make KPNG more like a library and decouple from the GRPC API #389
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| # Interface Print State Example | ||
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| This Example showcases the use of KPNG as a library, which simply prints the | ||
| ENLS(expected node local state) for services and endpoints from a running | ||
| K8s cluster. | ||
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| To run this manually simply point it to a kubeconfig and specify the node name | ||
| you're interested in i.e | ||
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| ```bash | ||
| go run main.go --kubeconfig=/home/USER/.kube/config --nodename=kpng-e2e-ipv4-nft-control-plane | ||
| ``` | ||
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| And you can watch as the state is delivered. | ||
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| For example when a simple hello world service is created with | ||
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| `kubectl expose deployment nginx-deployment --type=ClusterIP` | ||
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| The example shows the expected changes for a given node: | ||
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| ```bash | ||
| go run main.go --kubeconfig=/home/astoycos/.kube/config --nodename=kpng-e2e-ipv4-nft-worker | ||
| ... | ||
| I1021 15:06:50.966214 1033987 main.go:37] Got Service Update: Name -> nginx-deployment, Namespace -> default | ||
| I1021 15:06:50.970474 1033987 main.go:53] Got Endpoint Update: [EPSName: nginx-deployment-qzxrf, Ips: V4:"10.1.1.7", isLocal: true] for Service: nginx-deployment | ||
| I1021 15:06:50.970576 1033987 main.go:53] Got Endpoint Update: [EPSName: nginx-deployment-qzxrf, Ips: V4:"10.1.2.8", isLocal: false] for Service: nginx-deployment | ||
| ``` |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,7 @@ | ||
| module sigs.k8s.io/kpng/examples/interface-print-state | ||
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| go 1.19 | ||
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| require k8s.io/klog/v2 v2.80.1 | ||
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| require github.com/go-logr/logr v1.2.3 // indirect |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| github.com/go-logr/logr v1.2.3 h1:2DntVwHkVopvECVRSlL5PSo9eG+cAkDCuckLubN+rq0= | ||
| k8s.io/klog/v2 v2.80.1 h1:atnLQ121W371wYYFawwYx1aEY2eUfs4l3J72wtgAwV4= |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,90 @@ | ||
| /* | ||
| Copyright 2021 The Kubernetes Authors. | ||
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| 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 | ||
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| http://www.apache.org/licenses/LICENSE-2.0 | ||
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| 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. | ||
| */ | ||
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| package main | ||
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| import ( | ||
| "flag" | ||
| "fmt" | ||
| "os" | ||
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| "k8s.io/klog/v2" | ||
| "sigs.k8s.io/kpng/api/localnetv1" | ||
| "sigs.k8s.io/kpng/server/jobs/kube2store" | ||
| "sigs.k8s.io/kpng/server/jobs/store2localinterface" | ||
| ) | ||
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| type myBackend struct{} | ||
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| var _ store2localinterface.NodeLocalStateConsumer = myBackend{} | ||
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| func (m myBackend) UpdateServices(services <-chan *localnetv1.Service) { | ||
| klog.V(2).Info("In Backend Update Service") | ||
| for service := range services { | ||
| klog.Infof("Got Service Update: Name -> %s, Namespace -> %s\n", service.Name, service.Namespace) | ||
| } | ||
| } | ||
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| func (m myBackend) DeleteServices(services <-chan *localnetv1.Service) { | ||
| klog.V(2).Info("In Backend Delete Service") | ||
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| for service := range services { | ||
| klog.Infof("Got Service Delete: %v\n", service) | ||
| } | ||
| } | ||
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| func (m myBackend) UpdateEndpoints(endpoints <-chan *localnetv1.EndpointInfo) { | ||
| klog.V(2).Info("In Backend Update Endpoint") | ||
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| for endpoint := range endpoints { | ||
| klog.Infof("Got Endpoint Update: [EPSName: %s, Ips: %+v, isLocal: %v] for Service: %s \n", | ||
| endpoint.SourceName, endpoint.Endpoint.IPs, endpoint.Endpoint.Local, endpoint.ServiceName) | ||
| } | ||
| } | ||
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| func (m myBackend) DeleteEndpoints(endpoints <-chan *localnetv1.EndpointInfo) { | ||
| klog.V(2).Info("In Backend Delete Endpoint") | ||
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| for endpoint := range endpoints { | ||
| klog.Infof("Got Endpoint Delete: %v\n", endpoint) | ||
| } | ||
| } | ||
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| var ( | ||
| nodeName = flag.String("nodename", "", "Node Name to get services data") | ||
| kubeconfig = flag.String("kubeconfig", "", "Path to Kube Config") | ||
| ) | ||
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| func main() { | ||
| klog.InitFlags(nil) | ||
| defer klog.Flush() | ||
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| flag.Parse() | ||
| printBackend := myBackend{} | ||
| k2sCfg := &kube2store.Config{} | ||
| // kubeconfig := "~/.kube/config" | ||
| // kubeserver := "" | ||
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| ctx, store, err := store2localinterface.StartKube2store(k2sCfg, *kubeconfig, "") | ||
| if err != nil { | ||
| fmt.Printf("Unable to start kube2store exiting %v", err) | ||
| os.Exit(1) | ||
| } | ||
| // If this returns something broke :-) | ||
| store2localinterface.WatchStore(ctx, store, *nodeName, printBackend) | ||
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| ctx.Done() | ||
| } |
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why prefix an internal type with the project's name, or any part of the package path btw?
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Agreed :)