feat: modify reservation (GoogleCloudPlatform#3844)

Overriding failed test because tests need to be fixed in PR GoogleCloudPlatform#3832

Author: gryczj

compute/reservations/reservationVmsUpdate.js

@@ -0,0 +1,82 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * 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
+ *
+ *     https://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.
+ */
+
+'use strict';
+
+async function main() {
+  // [START compute_reservation_vms_update]
+  // Import the Compute library
+  const computeLib = require('@google-cloud/compute');
+
+  // Instantiate a reservationsClient
+  const reservationsClient = new computeLib.ReservationsClient();
+  // Instantiate a zoneOperationsClient
+  const zoneOperationsClient = new computeLib.ZoneOperationsClient();
+
+  /**
+   * TODO(developer): Update these variables before running the sample.
+   */
+  // The ID of the project where the reservation is located.
+  const projectId = await reservationsClient.getProjectId();
+  // The zone where the reservation is located.
+  const zone = 'us-central1-a';
+  // The name of an existing reservation.
+  const reservationName = 'reservation-01';
+  // The new number of VMs to reserve(increase or decrease the number). Before modifying the number of VMs,
+  // ensure that all required conditions are met. See: https://cloud.google.com/compute/docs/instances/reservations-modify#resizing_a_reservation.
+  const vmsNumber = 1;
+
+  async function callComputeReservationVmsUpdate() {
+    // Modify the number of reserved VMs in specific reservation
+    const [response] = await reservationsClient.resize({
+      project: projectId,
+      reservation: reservationName,
+      zone,
+      reservationsResizeRequestResource: {
+        specificSkuCount: vmsNumber,
+      },
+    });
+
+    let operation = response.latestResponse;
+
+    // Wait for the update reservation operation to complete.
+    while (operation.status !== 'DONE') {
+      [operation] = await zoneOperationsClient.wait({
+        operation: operation.name,
+        project: projectId,
+        zone: operation.zone.split('/').pop(),
+      });
+    }
+
+    const updatedReservation = (
+      await reservationsClient.get({
+        project: projectId,
+        zone,
+        reservation: reservationName,
+      })
+    )[0];
+
+    console.log(JSON.stringify(updatedReservation));
+  }
+
+  await callComputeReservationVmsUpdate();
+  // [END compute_reservation_vms_update]
+}
+
+main().catch(err => {
+  console.error(err);
+  process.exitCode = 1;
+});