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Merge pull request #104 from Kuadrant/103-topology-scaffolding-persis…
…ting-in-local-disk-the-existing-topology topology command: persist in local disk
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| package cmd | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "errors" | ||
| "os" | ||
| "os/exec" | ||
| "strings" | ||
|
|
||
| "github.com/goccy/go-graphviz" | ||
| "github.com/spf13/cobra" | ||
| corev1 "k8s.io/api/core/v1" | ||
| "k8s.io/client-go/kubernetes/scheme" | ||
| "sigs.k8s.io/controller-runtime/pkg/client" | ||
| "sigs.k8s.io/controller-runtime/pkg/client/config" | ||
| logf "sigs.k8s.io/controller-runtime/pkg/log" | ||
| ) | ||
|
|
||
| var ( | ||
| topologyNS string | ||
| topologySVGOutputFile string | ||
| topologyDOTOutputFile string | ||
| ) | ||
|
|
||
| func topologyCommand() *cobra.Command { | ||
| cmd := &cobra.Command{ | ||
| Use: "topology", | ||
| Short: "Export and visualize kuadrant topology", | ||
| Long: "Export and visualize kuadrant topology", | ||
| RunE: runTopology, | ||
| } | ||
|
|
||
| cmd.Flags().StringVarP(&topologyNS, "namespace", "n", "kuadrant-system", "Topology's namespace") | ||
| cmd.Flags().StringVarP(&topologySVGOutputFile, "output", "o", "", "SVG image output file") | ||
| cmd.Flags().StringVarP(&topologyDOTOutputFile, "dot", "d", "", "Graphviz DOT output file") | ||
| err := cmd.MarkFlagRequired("output") | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return cmd | ||
| } | ||
|
|
||
| func runTopology(cmd *cobra.Command, args []string) error { | ||
| if !strings.HasSuffix(topologySVGOutputFile, ".svg") { | ||
| return errors.New("output file must have .svg extension") | ||
| } | ||
| ctx := cmd.Context() | ||
| configuration, err := config.GetConfig() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| k8sClient, err := client.New(configuration, client.Options{Scheme: scheme.Scheme}) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| topologyKey := client.ObjectKey{Name: "topology", Namespace: topologyNS} | ||
| topologyConfigMap := &corev1.ConfigMap{} | ||
| err = k8sClient.Get(ctx, topologyKey, topologyConfigMap) | ||
| logf.Log.V(1).Info("reading topology", "object", client.ObjectKeyFromObject(topologyConfigMap), "error", err) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if topologyDOTOutputFile != "" { | ||
| fDot, err := os.Create(topologyDOTOutputFile) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer fDot.Close() | ||
|
|
||
| _, err = fDot.WriteString(topologyConfigMap.Data["topology"]) | ||
| logf.Log.V(1).Info("write topology in DOT format to file", "file", topologyDOTOutputFile, "error", err) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| g, err := graphviz.New(ctx) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| graph, err := graphviz.ParseBytes([]byte(topologyConfigMap.Data["topology"])) | ||
| logf.Log.V(1).Info("parse DOT graph", "graph empty", graph == nil, "error", err) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| nodeNum, err := graph.NodeNum() | ||
| logf.Log.V(1).Info("info graph", "graph nodenum", nodeNum, "error", err) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // 1. write encoded PNG data to buffer | ||
| var buf bytes.Buffer | ||
| err = g.Render(ctx, graph, graphviz.SVG, &buf) | ||
| logf.Log.V(1).Info("render graph to SVG", "buf len", buf.Len(), "error", err) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| // write to file | ||
| fSvg, err := os.Create(topologySVGOutputFile) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer fSvg.Close() | ||
|
|
||
| _, err = fSvg.Write(buf.Bytes()) | ||
| logf.Log.V(1).Info("write topology in SVG format to file", "file", topologySVGOutputFile, "error", err) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| externalCommand := "xdg-open" | ||
| if _, err := exec.LookPath("open"); err == nil { | ||
| externalCommand = "open" | ||
| } | ||
|
|
||
| openCmd := exec.Command(externalCommand, topologySVGOutputFile) | ||
| // pipe the commands output to the applications | ||
| // standard output | ||
| openCmd.Stdout = os.Stdout | ||
|
|
||
| // Run still runs the command and waits for completion | ||
| // but the output is instantly piped to Stdout | ||
| if err := openCmd.Run(); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } |
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