basic generic api examples

Signed-off-by: Zahar Pecherichny <zfrhv2010@gmail.com>

examples/kubectl/equivalents/apply.js

@@ -0,0 +1,21 @@
+const k8s = require('@kubernetes/client-node');
+
+const kc = new k8s.KubeConfig();
+kc.loadFromDefault();
+
+const client = k8s.KubernetesObjectApi.makeApiClient(kc);
+
+// update deployment "my-deployment" in namespace "my-namespace" to 3 replicas
+const deployment = {
+  apiVersion: 'apps/v1',
+  kind: 'Deployment',
+  metadata: {
+    name: 'my-deployment',
+    namespace: 'my-namespace'
+  },
+  spec: {
+    replicas: 3
+  }
+}
+
+client.patch(deployment)

examples/kubectl/equivalents/create.js

@@ -0,0 +1,14 @@
+const k8s = require('@kubernetes/client-node');
+
+const kc = new k8s.KubeConfig();
+kc.loadFromDefault();
+
+const client = k8s.KubernetesObjectApi.makeApiClient(kc);
+
+const namespace = {
+    metadata: {
+        name: 'test'
+    }
+}
+
+client.create(namespace)

examples/kubectl/equivalents/delete.js

@@ -0,0 +1,14 @@
+const k8s = require('@kubernetes/client-node');
+
+const kc = new k8s.KubeConfig();
+kc.loadFromDefault();
+
+const client = k8s.KubernetesObjectApi.makeApiClient(kc);
+
+const namespace = {
+    metadata: {
+        name: 'test'
+    }
+}
+
+client.delete(namespace)

examples/kubectl/equivalents/get.js

@@ -0,0 +1,15 @@
+const k8s = require('@kubernetes/client-node');
+
+const kc = new k8s.KubeConfig();
+kc.loadFromDefault();
+
+const client = k8s.KubernetesObjectApi.makeApiClient(kc);
+
+const namespace = {
+    metadata: {
+        name: 'test'
+    }
+}
+
+const live_namespace = (await client.read(namespace)).body
+console.log(live_namespace)

examples/typescript/apply/apply-example.ts

@@ -1,49 +1,21 @@
 import * as k8s from '@kubernetes/client-node';
-import * as yaml from 'js-yaml';
-import { promises as fs } from 'fs';
 
-/**
- * Replicate the functionality of `kubectl apply`.  That is, create the resources defined in the `specFile` if they do
- * not exist, patch them if they do exist.
- *
- * @param specPath File system path to a YAML Kubernetes spec.
- * @return Array of resources created
- */
-export async function apply(specPath: string): Promise<k8s.KubernetesObject[]> {
-    const kc = new k8s.KubeConfig();
-    kc.loadFromDefault();
+const kc = new k8s.KubeConfig();
+kc.loadFromDefault();
 
-    const client = k8s.KubernetesObjectApi.makeApiClient(kc);
+const client = k8s.KubernetesObjectApi.makeApiClient(kc);
 
-    const specString = await fs.readFile(specPath, 'utf8');
-    const specs: k8s.KubernetesObject[] = yaml.loadAll(specString);
-    const validSpecs = specs.filter((s) => s && s.kind && s.metadata);
-    const created: k8s.KubernetesObject[] = [];
-    for (const spec of validSpecs) {
-        // this is to convince the old version of TypeScript that metadata exists even though we already filtered specs
-        // without metadata out
-        spec.metadata = spec.metadata || {};
-        spec.metadata.annotations = spec.metadata.annotations || {};
-        delete spec.metadata.annotations['kubectl.kubernetes.io/last-applied-configuration'];
-        spec.metadata.annotations['kubectl.kubernetes.io/last-applied-configuration'] = JSON.stringify(spec);
-        try {
-            // try to get the resource, if it does not exist an error will be thrown and we will end up in the catch
-            // block.
-            await client.read(spec);
-            // we got the resource, so it exists, so patch it
-            //
-            // Note that this could fail if the spec refers to a custom resource. For custom resources you may need
-            // to specify a different patch merge strategy in the content-type header.
-            //
-            // See: https://github.com/kubernetes/kubernetes/issues/97423
-            const response = await client.patch(spec);
-            created.push(response.body);
-        } catch (e) {
-            // we did not get the resource, so it does not exist, so create it
-            const response = await client.create(spec);
-            created.push(response.body);
-        }
-    }
-
-    return created;
+// update deployment "my-deployment" in namespace "my-namespace" to 3 replicas
+const deployment = {
+  apiVersion: 'apps/v1',
+  kind: 'Deployment',
+  metadata: {
+    name: 'my-deployment',
+    namespace: 'my-namespace'
+  },
+  spec: {
+    replicas: 3
+  }
 }
+
+client.patch(deployment)

examples/typescript/apply/apply-from-file-example.ts

@@ -0,0 +1,53 @@
+import * as k8s from '@kubernetes/client-node';
+import * as yaml from 'js-yaml';
+import { promises as fs } from 'fs';
+
+/**
+ * Replicate the functionality of `kubectl apply`.  That is, create the resources defined in the `specFile` if they do
+ * not exist, patch them if they do exist.
+ *
+ * @param specPath File system path to a YAML Kubernetes spec.
+ * @return Array of resources created
+ */
+export async function apply(specPath: string): Promise<k8s.KubernetesObject[]> {
+    const kc = new k8s.KubeConfig();
+    kc.loadFromDefault();
+
+    const client = k8s.KubernetesObjectApi.makeApiClient(kc);
+
+    const specString = await fs.readFile(specPath, 'utf8');
+    const specs: k8s.KubernetesObject[] = yaml.loadAll(specString);
+    const validSpecs = specs.filter((s) => s && s.kind && s.metadata);
+    const created: k8s.KubernetesObject[] = [];
+    for (const spec of validSpecs) {
+        // this is to convince the old version of TypeScript that metadata exists even though we already filtered specs
+        // without metadata out
+        spec.metadata = spec.metadata || {};
+        spec.metadata.annotations = spec.metadata.annotations || {};
+        delete spec.metadata.annotations['kubectl.kubernetes.io/last-applied-configuration'];
+        spec.metadata.annotations['kubectl.kubernetes.io/last-applied-configuration'] = JSON.stringify(spec);
+        try {
+            // try to get the resource, if it does not exist an error will be thrown and we will end up in the catch
+            // block.
+            await client.read(spec);
+            // we got the resource, so it exists, so patch it
+            //
+            // Note that this could fail if the spec refers to a custom resource. For custom resources you may need
+            // to specify a different patch merge strategy in the content-type header.
+            //
+            // See: https://github.com/kubernetes/kubernetes/issues/97423
+            const response = await client.patch(spec);
+            created.push(response.body);
+        } catch (err) {
+            // if the resource doesnt exist then create it
+            if (err instanceof k8s.HttpError && err.statusCode == 404) {
+              const response = await client.create(spec);
+              created.push(response.body);
+            } else {
+              throw err
+            } 
+        }
+    }
+
+    return created;
+}