feat: odigos describe remote flag to run the cluster (#1541)

This can be used to run `odigos describe` in machines where `kubectl`
may lacks permissions for some of the resources.

It runs the describe in the ui deployment which can access the relevant
resources, and return it with http to the cli

.dockerignore

@@ -1,4 +1,4 @@
-ui/node_modules
+frontend/node_modules
 .git/
 Dockerfile
 odiglet/Dockerfile

cli/cmd/resources/ui.go

@@ -229,6 +229,11 @@ func NewUIClusterRole() *rbacv1.ClusterRole {
 				Resources: []string{"configmaps"},
 				Verbs:     []string{"get", "list", "watch", "patch", "create", "delete", "update"},
 			},
+			{
+				APIGroups: []string{""},
+				Resources: []string{"pods"},
+				Verbs:     []string{"get", "list"},
+			},
 			{
 				APIGroups: []string{"apps"},
 				Resources: []string{"deployments", "statefulsets", "daemonsets"},

cli/pkg/kube/client.go

@@ -29,6 +29,7 @@ import (
 
 type Client struct {
 	kubernetes.Interface
+	Clientset     *kubernetes.Clientset
 	Dynamic       *dynamic.DynamicClient
 	ApiExtensions apiextensionsclient.Interface
 	OdigosClient  v1alpha1.OdigosV1alpha1Interface
@@ -65,6 +66,7 @@ func CreateClient(cmd *cobra.Command) (*Client, error) {
 
 	return &Client{
 		Interface:     clientset,
+		Clientset:     clientset,
 		Dynamic:       dynamicClient,
 		ApiExtensions: extendClientset,
 		OdigosClient:  odigosClient,

docs/cli/odigos_describe.mdx

@@ -83,6 +83,7 @@ Pods (Total 1, Running 1):
 
 ```
     -n, --namespace          namespace of the source being described (default "default")
+    -r, --remote             use odigos ui service in the cluster to describe the entity
 ```
 
 

frontend/Dockerfile

@@ -23,4 +23,4 @@ FROM gcr.io/distroless/static:nonroot
 WORKDIR /app
 COPY --from=backend /app/frontend/odigos-ui .
 USER 65532:65532
-ENTRYPOINT ["/app/odigos-ui"]
+ENTRYPOINT ["/app/odigos-ui", "--address", "0.0.0.0"]

frontend/endpoints/describe.go

@@ -0,0 +1,26 @@
+package endpoints
+
+import (
+	"github.com/gin-gonic/gin"
+	"github.com/odigos-io/odigos/frontend/kube"
+	"github.com/odigos-io/odigos/k8sutils/pkg/describe"
+)
+
+func DescribeSource(c *gin.Context, ns string, kind string, name string) {
+	ctx := c.Request.Context()
+	switch kind {
+	case "deployment":
+		describeText := describe.DescribeDeployment(ctx, kube.DefaultClient.Interface, kube.DefaultClient.OdigosClient, ns, name)
+		c.Writer.WriteString(describeText)
+	case "daemonset":
+		describeText := describe.DescribeDaemonSet(ctx, kube.DefaultClient.Interface, kube.DefaultClient.OdigosClient, ns, name)
+		c.Writer.WriteString(describeText)
+	case "statefulset":
+		describeText := describe.DescribeStatefulSet(ctx, kube.DefaultClient.Interface, kube.DefaultClient.OdigosClient, ns, name)
+		c.Writer.WriteString(describeText)
+	default:
+		c.JSON(404, gin.H{
+			"message": "kind not supported",
+		})
+	}
+}

frontend/main.go

@@ -127,6 +127,11 @@ func startHTTPServer(flags *Flags, odigosMetrics *collectormetrics.OdigosMetrics
 		apis.DELETE("/instrumentation-rules/:id", func(c *gin.Context) { endpoints.DeleteInstrumentationRule(c, flags.Namespace, c.Param("id")) })
 		apis.PUT("/instrumentation-rules/:id", func(c *gin.Context) { endpoints.UpdateInstrumentationRule(c, flags.Namespace, c.Param("id")) })
 
+		// Describe
+		apis.GET("/describe/source/namespace/:namespace/kind/:kind/name/:name", func(c *gin.Context) {
+			endpoints.DescribeSource(c, c.Param("namespace"), c.Param("kind"), c.Param("name"))
+		})
+
 		apis.GET("/actions", func(c *gin.Context) { actions.GetActions(c, flags.Namespace) })
 
 		// AddClusterInfo

helm/odigos/templates/ui/clusterrole.yaml

@@ -24,6 +24,13 @@ rules:
       - create
       - delete
       - update
+  - apiGroups:
+      - ""
+    resources:
+      - pods
+    verbs:
+      - get
+      - list
   - apiGroups:
       - apps
     resources: