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import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "cloud.google.com/go/compute/apiv1/computepb"
	"google.golang.org/protobuf/proto"
)

// Creates the reservation from given template in particular zone
func createReservation(w io.Writer, projectID, zone, reservationName, sourceTemplate string) error {
	// projectID := "your_project_id"
	// zone := "us-west3-a"
	// reservationName := "your_reservation_name"
	// template: existing template path. Following formats are allowed:
	//  	- projects/{project_id}/global/instanceTemplates/{template_name}
	//  	- projects/{project_id}/regions/{region}/instanceTemplates/{template_name}
	//  	- https://www.googleapis.com/compute/v1/projects/{project_id}/global/instanceTemplates/instanceTemplate
	//  	- https://www.googleapis.com/compute/v1/projects/{project_id}/regions/{region}/instanceTemplates/instanceTemplate

	ctx := context.Background()
	reservationsClient, err := compute.NewReservationsRESTClient(ctx)
	if err != nil {
		return err
	}
	defer reservationsClient.Close()

	req := &computepb.InsertReservationRequest{
		Project: projectID,
		ReservationResource: &computepb.Reservation{
			Name: proto.String(reservationName),
			Zone: proto.String(zone),
			SpecificReservation: &computepb.AllocationSpecificSKUReservation{
				Count:                  proto.Int64(2),
				SourceInstanceTemplate: proto.String(sourceTemplate),
			},
		},
		Zone: zone,
	}

	op, err := reservationsClient.Insert(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to create reservation: %w", err)
	}

	if err = op.Wait(ctx); err != nil {
		return fmt.Errorf("unable to wait for the operation: %w", err)
	}

	fmt.Fprintf(w, "Reservation created\n")

	return nil
}

import com.google.cloud.compute.v1.AllocationSpecificSKUReservation;
import com.google.cloud.compute.v1.Operation;
import com.google.cloud.compute.v1.Reservation;
import com.google.cloud.compute.v1.ReservationsClient;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class CreateReservationForInstanceTemplate {

  public static void main(String[] args)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.
    // Project ID or project number of the Cloud project you want to use.
    String projectId = "YOUR_PROJECT_ID";
    // Name of the zone in which you want to create the reservation.
    String zone = "us-central1-a";
    // Name of the reservation you want to create.
    String reservationName = "YOUR_RESERVATION_NAME";
    // The number of virtual machines you want to create.
    int numberOfVms = 3;
    // The URI of the instance template with GLOBAL location
    // to be used for creating the reservation.
    String instanceTemplateUri =
        "projects/YOUR_PROJECT_ID/global/instanceTemplates/YOUR_INSTANCE_TEMPLATE_NAME";
    // The URI of the instance template with REGIONAL location
    // to be used for creating the reservation. For us-central1 region in this case.
    // String instanceTemplateUri =
    // "projects/YOUR_PROJECT_ID/regions/us-central1/instanceTemplates/YOUR_INSTANCE_TEMPLATE_NAME"

    createReservationForInstanceTemplate(
        projectId, reservationName, instanceTemplateUri, numberOfVms, zone);
  }

  // Creates a reservation in a project for the instance template.
  public static Reservation createReservationForInstanceTemplate(
      String projectId, String reservationName, String instanceTemplateUri,
      int numberOfVms, String zone)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests.
    try (ReservationsClient reservationsClient = ReservationsClient.create()) {
      Reservation reservation =
          Reservation.newBuilder()
              .setName(reservationName)
              .setZone(zone)
              .setSpecificReservation(
                  AllocationSpecificSKUReservation.newBuilder()
                      // Set the number of instances
                      .setCount(numberOfVms)
                      // Set the instance template to be used for creating the reservation.
                      .setSourceInstanceTemplate(instanceTemplateUri)
                      .build())
              .build();

      Operation response =
          reservationsClient.insertAsync(projectId, zone, reservation).get(3, TimeUnit.MINUTES);

      if (response.hasError()) {
        return null;
      }
      return reservationsClient.get(projectId, zone, reservationName);
    }
  }
}

// Import the Compute library
const computeLib = require('@google-cloud/compute');
const compute = computeLib.protos.google.cloud.compute.v1;

// Instantiate a reservationsClient
const reservationsClient = new computeLib.ReservationsClient();
// Instantiate a zoneOperationsClient
const zoneOperationsClient = new computeLib.ZoneOperationsClient();

/**
 * TODO(developer): Update/uncomment these variables before running the sample.
 */
// The ID of the project where you want to reserve resources and where the instance template exists.
const projectId = await reservationsClient.getProjectId();
// The zone in which to reserve resources.
const zone = 'us-central1-a';
// The name of the reservation to create.
// reservationName = 'reservation-01';
// The number of VMs to reserve.
const vmsNumber = 3;

/**
 * The name of an existing instance template.
 * TODO(developer): Uncomment and update instanceTemplateName before running the sample.
 */
// const instanceTemplateName = 'pernament-region-template-name';

/**
 * // The location of the instance template.
 * TODO(developer): Uncomment the `location` variable depending on which template you want to use.
 */

// The location for a regional instance template: regions/{region}. Replace region with the region where the instance template is located.
// If you specify a regional instance template, then you can only reserve VMs within the same region as the template's region.
// const location = `regions/${zone.slice(0, -2)}`;

// The location for a global instance template.
// const location = 'global';

async function callCreateComputeReservationInstanceTemplate() {
  // Create reservation for 3 VMs in zone us-central1-a by specifying a instance template.
  const specificReservation = new compute.AllocationSpecificSKUReservation({
    count: vmsNumber,
    sourceInstanceTemplate: `projects/${projectId}/${location}/instanceTemplates/${instanceTemplateName}`,
  });

  // Create a reservation.
  const reservation = new compute.Reservation({
    name: reservationName,
    specificReservation,
    // To specify that only VMs that specifically target this reservation can consume it,
    // set specificReservationRequired field to true.
    specificReservationRequired: true,
  });

  const [response] = await reservationsClient.insert({
    project: projectId,
    reservationResource: reservation,
    zone,
  });

  let operation = response.latestResponse;

  // Wait for the create reservation operation to complete.
  while (operation.status !== 'DONE') {
    [operation] = await zoneOperationsClient.wait({
      operation: operation.name,
      project: projectId,
      zone: operation.zone.split('/').pop(),
    });
  }

  console.log(`Reservation: ${reservationName} created.`);
}

await callCreateComputeReservationInstanceTemplate();

from __future__ import annotations

import sys
from typing import Any

from google.api_core.extended_operation import ExtendedOperation
from google.cloud import compute_v1


def wait_for_extended_operation(
    operation: ExtendedOperation, verbose_name: str = "operation", timeout: int = 300
) -> Any:
    """
    Waits for the extended (long-running) operation to complete.

    If the operation is successful, it will return its result.
    If the operation ends with an error, an exception will be raised.
    If there were any warnings during the execution of the operation
    they will be printed to sys.stderr.

    Args:
        operation: a long-running operation you want to wait on.
        verbose_name: (optional) a more verbose name of the operation,
            used only during error and warning reporting.
        timeout: how long (in seconds) to wait for operation to finish.
            If None, wait indefinitely.

    Returns:
        Whatever the operation.result() returns.

    Raises:
        This method will raise the exception received from `operation.exception()`
        or RuntimeError if there is no exception set, but there is an `error_code`
        set for the `operation`.

        In case of an operation taking longer than `timeout` seconds to complete,
        a `concurrent.futures.TimeoutError` will be raised.
    """
    result = operation.result(timeout=timeout)

    if operation.error_code:
        print(
            f"Error during {verbose_name}: [Code: {operation.error_code}]: {operation.error_message}",
            file=sys.stderr,
            flush=True,
        )
        print(f"Operation ID: {operation.name}", file=sys.stderr, flush=True)
        raise operation.exception() or RuntimeError(operation.error_message)

    if operation.warnings:
        print(f"Warnings during {verbose_name}:\n", file=sys.stderr, flush=True)
        for warning in operation.warnings:
            print(f" - {warning.code}: {warning.message}", file=sys.stderr, flush=True)

    return result


def create_reservation_from_template(
    project_id: str, reservation_name: str, template: str
) -> compute_v1.Reservation:
    """
    Create a new reservation based on an existing template.

    Args:
        project_id: project ID or project number of the Cloud project you use.
        reservation_name: the name of new reservation.
        template: existing template path. Following formats are allowed:
            - projects/{project_id}/global/instanceTemplates/{template_name}
            - projects/{project_id}/regions/{region}/instanceTemplates/{template_name}
            - https://www.googleapis.com/compute/v1/projects/{project_id}/global/instanceTemplates/instanceTemplate
            - https://www.googleapis.com/compute/v1/projects/{project_id}/regions/{region}/instanceTemplates/instanceTemplate

    Returns:
        Reservation object that represents the new reservation.
    """

    reservations_client = compute_v1.ReservationsClient()
    request = compute_v1.InsertReservationRequest()
    request.project = project_id
    request.zone = "us-central1-a"

    specific_reservation = compute_v1.AllocationSpecificSKUReservation()
    specific_reservation.count = 1
    specific_reservation.source_instance_template = template

    reservation = compute_v1.Reservation()
    reservation.name = reservation_name
    reservation.specific_reservation = specific_reservation

    request.reservation_resource = reservation
    operation = reservations_client.insert(request)
    wait_for_extended_operation(operation, "Reservation creation")

    return reservations_client.get(
        project=project_id, zone="us-central1-a", reservation=reservation_name
    )

import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	computepb "cloud.google.com/go/compute/apiv1/computepb"
	"google.golang.org/protobuf/proto"
)

// Creates the reservation with accelerated image
func createBaseReservation(w io.Writer, projectID, zone, reservationName string) error {
	// projectID := "your_project_id"
	// zone := "us-west3-a"
	// reservationName := "your_reservation_name"

	ctx := context.Background()
	reservationsClient, err := compute.NewReservationsRESTClient(ctx)
	if err != nil {
		return err
	}
	defer reservationsClient.Close()

	// Creating reservation based on direct properties
	req := &computepb.InsertReservationRequest{
		Project: projectID,
		ReservationResource: &computepb.Reservation{
			Name: proto.String(reservationName),
			Zone: proto.String(zone),
			SpecificReservation: &computepb.AllocationSpecificSKUReservation{
				Count: proto.Int64(2),
				// Properties, which allows customising instances
				InstanceProperties: &computepb.AllocationSpecificSKUAllocationReservedInstanceProperties{
					// Attaching GPUs to the reserved VMs
					// Read more: https://cloud.google.com/compute/docs/gpus#n1-gpus
					GuestAccelerators: []*computepb.AcceleratorConfig{
						{
							AcceleratorCount: proto.Int32(1),
							AcceleratorType:  proto.String("nvidia-tesla-t4"),
						},
					},
					// Including local SSD disks
					LocalSsds: []*computepb.AllocationSpecificSKUAllocationAllocatedInstancePropertiesReservedDisk{
						{
							DiskSizeGb: proto.Int64(375),
							Interface:  proto.String("NVME"),
						},
					},
					MachineType: proto.String("n1-standard-2"),
					// Specifying minimum CPU platform
					// Read more: https://cloud.google.com/compute/docs/instances/specify-min-cpu-platform
					MinCpuPlatform: proto.String("Intel Skylake"),
				},
			},
		},
		Zone: zone,
	}

	op, err := reservationsClient.Insert(ctx, req)
	if err != nil {
		return fmt.Errorf("unable to create reservation: %w", err)
	}

	if err = op.Wait(ctx); err != nil {
		return fmt.Errorf("unable to wait for the operation: %w", err)
	}

	fmt.Fprintf(w, "Reservation created\n")

	return nil
}

import com.google.cloud.compute.v1.AcceleratorConfig;
import com.google.cloud.compute.v1.AllocationSpecificSKUAllocationAllocatedInstancePropertiesReservedDisk;
import com.google.cloud.compute.v1.AllocationSpecificSKUAllocationReservedInstanceProperties;
import com.google.cloud.compute.v1.AllocationSpecificSKUReservation;
import com.google.cloud.compute.v1.Operation;
import com.google.cloud.compute.v1.Reservation;
import com.google.cloud.compute.v1.ReservationsClient;
import java.io.IOException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class CreateReservation {

  public static void main(String[] args)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // TODO(developer): Replace these variables before running the sample.
    // Project ID or project number of the Cloud project you want to use.
    String projectId = "YOUR_PROJECT_ID";
    // Name of the zone in which you want to create the disk.
    String zone = "us-central1-a";
    // Name of the reservation you want to create.
    String reservationName = "YOUR_RESERVATION_NAME";
    // Number of instances in the reservation.
    int numberOfVms = 3;

    createReservation(projectId, reservationName, numberOfVms, zone);
  }

  // Creates reservation with optional flags
  public static Reservation createReservation(
      String projectId, String reservationName, int numberOfVms, String zone)
      throws IOException, ExecutionException, InterruptedException, TimeoutException {
    // Create the reservation with optional properties:
    // Machine type of the instances in the reservation.
    String machineType = "n1-standard-2";
    // Number of accelerators to be attached to the instances in the reservation.
    int numberOfAccelerators = 1;
    // Accelerator type to be attached to the instances in the reservation.
    String acceleratorType = "nvidia-tesla-t4";
    // Minimum CPU platform to be attached to the instances in the reservation.
    String minCpuPlatform = "Intel Skylake";
    // Local SSD size in GB to be attached to the instances in the reservation.
    int localSsdSize = 375;
    // Local SSD interfaces to be attached to the instances in the reservation.
    String localSsdInterface1 = "NVME";
    String localSsdInterface2 = "SCSI";
    boolean specificReservationRequired = true;
    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests.
    try (ReservationsClient reservationsClient = ReservationsClient.create()) {
      Reservation reservation =
          Reservation.newBuilder()
              .setName(reservationName)
              .setZone(zone)
              .setSpecificReservationRequired(specificReservationRequired)
              .setSpecificReservation(
                  AllocationSpecificSKUReservation.newBuilder()
                      // Set the number of instances
                      .setCount(numberOfVms)
                      // Set instance properties
                      .setInstanceProperties(
                          AllocationSpecificSKUAllocationReservedInstanceProperties.newBuilder()
                              .setMachineType(machineType)
                              .setMinCpuPlatform(minCpuPlatform)
                              .addGuestAccelerators(
                                  AcceleratorConfig.newBuilder()
                                      .setAcceleratorCount(numberOfAccelerators)
                                      .setAcceleratorType(acceleratorType)
                                      .build())
                              .addLocalSsds(
                            AllocationSpecificSKUAllocationAllocatedInstancePropertiesReservedDisk
                                      .newBuilder()
                                      .setDiskSizeGb(localSsdSize)
                                      .setInterface(localSsdInterface1)
                                      .build())
                              .addLocalSsds(
                            AllocationSpecificSKUAllocationAllocatedInstancePropertiesReservedDisk
                                      .newBuilder()
                                      .setDiskSizeGb(localSsdSize)
                                      .setInterface(localSsdInterface2)
                                      .build())
                              .build())
                      .build())
              .build();

      Operation response =
          reservationsClient.insertAsync(projectId, zone, reservation).get(7, TimeUnit.MINUTES);

      if (response.hasError()) {
        return null;
      }
      return reservationsClient.get(projectId, zone, reservationName);
    }
  }
}

// Import the Compute library
const computeLib = require('@google-cloud/compute');
const compute = computeLib.protos.google.cloud.compute.v1;

// Instantiate a reservationsClient
const reservationsClient = new computeLib.ReservationsClient();
// Instantiate a zoneOperationsClient
const zoneOperationsClient = new computeLib.ZoneOperationsClient();

/**
 * TODO(developer): Update/uncomment these variables before running the sample.
 */
// The ID of the project where you want to reserve resources.
const projectId = await reservationsClient.getProjectId();
// The zone in which to reserve resources.
const zone = 'us-central1-a';
// The name of the reservation to create.
// reservationName = 'reservation-01';
// The number of VMs to reserve.
const vmsNumber = 3;
// Machine type to use for each VM.
const machineType = 'n1-standard-4';

async function callCreateComputeReservationFromProperties() {
  // Create specific reservation for 3 VMs that each use an N1 predefined machine type with 4 vCPUs.
  const specificReservation = new compute.AllocationSpecificSKUReservation({
    count: vmsNumber,
    instanceProperties: {
      machineType,
      // To have the reserved VMs use a specific minimum CPU platform instead of the zone's default CPU platform.
      minCpuPlatform: 'Intel Skylake',
      // If you want to attach GPUs to your reserved N1 VMs, update and uncomment guestAccelerators if needed.
      // guestAccelerators: [
      //   {
      //     // The number of GPUs to add per reserved VM.
      //     acceleratorCount: 1,
      //     // Supported GPU model for N1 VMs. Ensure that your chosen GPU model is available in the zone,
      //     // where you want to reserve resources.
      //     acceleratorType: 'nvidia-tesla-t4',
      //   },
      // ],
      // If you want to add local SSD disks to each reserved VM, update and uncomment localSsds if needed.
      // You can specify up to 24 Local SSD disks. Each Local SSD disk is 375 GB.
      // localSsds: [
      //   {
      //     diskSizeGb: 375,
      //     // The type of interface you want each Local SSD disk to use. Specify one of the following values: NVME or SCSI.
      //     // Make sure that the machine type you specify for the reserved VMs supports the chosen disk interfaces.
      //     interface: 'NVME',
      //   },
      // ],
    },
  });

  // Create a reservation.
  const reservation = new compute.Reservation({
    name: reservationName,
    zone,
    specificReservation,
    // To specify that only VMs that specifically target this reservation can consume it,
    // set specificReservationRequired field to true.
    specificReservationRequired: true,
  });

  const [response] = await reservationsClient.insert({
    project: projectId,
    reservationResource: reservation,
    zone,
  });

  let operation = response.latestResponse;

  // Wait for the create reservation operation to complete.
  while (operation.status !== 'DONE') {
    [operation] = await zoneOperationsClient.wait({
      operation: operation.name,
      project: projectId,
      zone: operation.zone.split('/').pop(),
    });
  }

  console.log(`Reservation: ${reservationName} created.`);
}

await callCreateComputeReservationFromProperties();

from __future__ import annotations

import sys
from typing import Any

from google.api_core.extended_operation import ExtendedOperation
from google.cloud import compute_v1


def wait_for_extended_operation(
    operation: ExtendedOperation, verbose_name: str = "operation", timeout: int = 300
) -> Any:
    """
    Waits for the extended (long-running) operation to complete.

    If the operation is successful, it will return its result.
    If the operation ends with an error, an exception will be raised.
    If there were any warnings during the execution of the operation
    they will be printed to sys.stderr.

    Args:
        operation: a long-running operation you want to wait on.
        verbose_name: (optional) a more verbose name of the operation,
            used only during error and warning reporting.
        timeout: how long (in seconds) to wait for operation to finish.
            If None, wait indefinitely.

    Returns:
        Whatever the operation.result() returns.

    Raises:
        This method will raise the exception received from `operation.exception()`
        or RuntimeError if there is no exception set, but there is an `error_code`
        set for the `operation`.

        In case of an operation taking longer than `timeout` seconds to complete,
        a `concurrent.futures.TimeoutError` will be raised.
    """
    result = operation.result(timeout=timeout)

    if operation.error_code:
        print(
            f"Error during {verbose_name}: [Code: {operation.error_code}]: {operation.error_message}",
            file=sys.stderr,
            flush=True,
        )
        print(f"Operation ID: {operation.name}", file=sys.stderr, flush=True)
        raise operation.exception() or RuntimeError(operation.error_message)

    if operation.warnings:
        print(f"Warnings during {verbose_name}:\n", file=sys.stderr, flush=True)
        for warning in operation.warnings:
            print(f" - {warning.code}: {warning.message}", file=sys.stderr, flush=True)

    return result


def create_compute_reservation(
    project_id: str,
    zone: str = "us-central1-a",
    reservation_name="your-reservation-name",
) -> compute_v1.Reservation:
    """Creates a compute reservation in GCP.
    Args:
        project_id (str): The ID of the Google Cloud project.
        zone (str): The zone to create the reservation.
        reservation_name (str): The name of the reservation to create.
    Returns:
        Reservation object that represents the new reservation.
    """

    instance_properties = compute_v1.AllocationSpecificSKUAllocationReservedInstanceProperties(
        machine_type="n1-standard-1",
        # Optional. Specifies the minimum CPU platform for the VM instance.
        min_cpu_platform="Intel Ivy Bridge",
        # Optional. Specifies amount of local ssd to reserve with each instance.
        local_ssds=[
            compute_v1.AllocationSpecificSKUAllocationAllocatedInstancePropertiesReservedDisk(
                disk_size_gb=375, interface="NVME"
            ),
            compute_v1.AllocationSpecificSKUAllocationAllocatedInstancePropertiesReservedDisk(
                disk_size_gb=375, interface="SCSI"
            ),
        ],
        # Optional. Specifies the GPUs allocated to each instance.
        # guest_accelerators=[
        #     compute_v1.AcceleratorConfig(
        #         accelerator_count=1, accelerator_type="nvidia-tesla-t4"
        #     )
        # ],
    )

    reservation = compute_v1.Reservation(
        name=reservation_name,
        specific_reservation=compute_v1.AllocationSpecificSKUReservation(
            count=3,  # Number of resources that are allocated.
            # If you use source_instance_template, you must exclude the instance_properties field.
            # It can be a full or partial URL.
            # source_instance_template="projects/[PROJECT_ID]/global/instanceTemplates/my-instance-template",
            instance_properties=instance_properties,
        ),
    )

    # Create a client
    client = compute_v1.ReservationsClient()

    operation = client.insert(
        project=project_id,
        zone=zone,
        reservation_resource=reservation,
    )
    wait_for_extended_operation(operation, "Reservation creation")

    reservation = client.get(
        project=project_id, zone=zone, reservation=reservation_name
    )

    print("Name: ", reservation.name)
    print("STATUS: ", reservation.status)
    print(reservation.specific_reservation)
    # Example response:
    # Name:  your-reservation-name
    # STATUS:  READY
    # count: 3
    # instance_properties {
    #   machine_type: "n1-standard-1"
    #   local_ssds {
    #     disk_size_gb: 375
    #     interface: "NVME"
    #   }
    # ...

    return reservation

resource "google_compute_reservation" "default" {
  name = "gce-reservation-local"
  zone = "us-central1-a"

  /**
   * To specify a single-project reservation, omit the share_settings block
   * (default) or set the share_type field to LOCAL.
   */
  share_settings {
    share_type = "LOCAL"
  }

  specific_reservation {
    count = 1
    instance_properties {
      machine_type = "n2-standard-2"
    }
  }

  /**
   * To let VMs with affinity for any reservation consume this reservation, omit
   * the specific_reservation_required field (default) or set it to false.
   */
  specific_reservation_required = false
}