Compute Engine client libraries

<dependency>
  <groupId>com.google.cloud</groupId>
  <artifactId>google-cloud-compute</artifactId>
  <version>1.13.0</version>
</dependency>

implementation 'com.google.cloud:google-cloud-compute:1.15.0'

libraryDependencies += "com.google.cloud" % "google-cloud-compute" % "1.15.0"

using Google.Cloud.Compute.V1;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

public class ListZoneInstancesAsyncSample
{
    public async Task<IList<Instance>> ListZoneInstancesAsync(
        // TODO(developer): Set your own default values for these parameters or pass different values when calling this method.
        string projectId = "your-project-id", 
        string zone = "us-central1-a")
    {
        // Initialize client that will be used to send requests. This client only needs to be created
        // once, and can be reused for multiple requests.
        InstancesClient client = await InstancesClient.CreateAsync();
        IList<Instance> allInstances = new List<Instance>();

        // Make the request to list all VM instances in the given zone in the specified project.
        await foreach(var instance in client.ListAsync(projectId, zone))
        {
            // The result is an Instance collection.
            Console.WriteLine($"Instance: {instance.Name}");
            allInstances.Add(instance);
        }

        return allInstances;
    }
}

import (
	"context"
	"fmt"
	"io"

	compute "cloud.google.com/go/compute/apiv1"
	"google.golang.org/api/iterator"
	computepb "google.golang.org/genproto/googleapis/cloud/compute/v1"
)

// listInstances prints a list of instances created in given project in given zone.
func listInstances(w io.Writer, projectID, zone string) error {
	// projectID := "your_project_id"
	// zone := "europe-central2-b"
	ctx := context.Background()
	instancesClient, err := compute.NewInstancesRESTClient(ctx)
	if err != nil {
		return fmt.Errorf("NewInstancesRESTClient: %v", err)
	}
	defer instancesClient.Close()

	req := &computepb.ListInstancesRequest{
		Project: projectID,
		Zone:    zone,
	}

	it := instancesClient.List(ctx, req)
	fmt.Fprintf(w, "Instances found in zone %s:\n", zone)
	for {
		instance, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return err
		}
		fmt.Fprintf(w, "- %s %s\n", instance.GetName(), instance.GetMachineType())
	}
	return nil
}

import com.google.cloud.compute.v1.Instance;
import com.google.cloud.compute.v1.InstancesClient;
import java.io.IOException;

public class ListInstance {

  public static void main(String[] args) throws IOException {
    // TODO(developer): Replace these variables before running the sample
    String project = "your-project-id";
    String zone = "zone-name";
    listInstances(project, zone);
  }

  // List all instances in the given zone in the specified project ID.
  public static void listInstances(String project, String zone) throws IOException {
    // Initialize client that will be used to send requests. This client only needs to be created
    // once, and can be reused for multiple requests. After completing all of your requests, call
    // the `instancesClient.close()` method on the client to 
    // safely clean up any remaining background resources.
    try (InstancesClient instancesClient = InstancesClient.create()) {
      // Set the project and zone to retrieve instances present in the zone.
      System.out.printf("Listing instances from %s in %s:", project, zone);
      for (Instance zoneInstance : instancesClient.list(project, zone).iterateAll()) {
        System.out.println(zoneInstance.getName());
      }
      System.out.println("####### Listing instances complete #######");
    }
  }
}

/**
 * TODO(developer): Uncomment and replace these variables before running the sample.
 */
// const projectId = 'YOUR_PROJECT_ID';
// const zone = 'europe-central2-b'

const compute = require('@google-cloud/compute');

// List all instances in the given zone in the specified project.
async function listInstances() {
  const instancesClient = new compute.InstancesClient();

  const [instanceList] = await instancesClient.list({
    project: projectId,
    zone,
  });

  console.log(`Instances found in zone ${zone}:`);

  for (const instance of instanceList) {
    console.log(` - ${instance.name} (${instance.machineType})`);
  }
}

listInstances();

use Google\Cloud\Compute\V1\InstancesClient;

/**
 * List all instances for a particular Cloud project and zone.
 *
 * @param string $projectId Your Google Cloud project ID.
 * @param string $zone Zone to list instances for (like "us-central1-a").
 *
 * @throws \Google\ApiCore\ApiException if the remote call fails.
 */
function list_instances(string $projectId, string $zone)
{
    // List Compute Engine instances using InstancesClient.
    $instancesClient = new InstancesClient();
    $instancesList = $instancesClient->list($projectId, $zone);

    printf('Instances for %s (%s)' . PHP_EOL, $projectId, $zone);
    foreach ($instancesList as $instance) {
        printf(' - %s' . PHP_EOL, $instance->getName());
    }
}

from typing import Iterable

from google.cloud import compute_v1


def list_instances(project_id: str, zone: str) -> Iterable[compute_v1.Instance]:
    """
    List all instances in the given zone in the specified project.

    Args:
        project_id: project ID or project number of the Cloud project you want to use.
        zone: name of the zone you want to use. For example: “us-west3-b”
    Returns:
        An iterable collection of Instance objects.
    """
    instance_client = compute_v1.InstancesClient()
    instance_list = instance_client.list(project=project_id, zone=zone)

    print(f"Instances found in zone {zone}:")
    for instance in instance_list:
        print(f" - {instance.name} ({instance.machine_type})")

    return instance_list

require "google/cloud/compute/v1"

# Lists all instances in the given zone in the specified project.
#
# @param [String] project project ID or project number of the Cloud project you want to use.
# @param [String] zone name of the zone you want to use. For example: "us-west3-b"
# @return [Array<::Google::Cloud::Compute::V1::Instance>] Array of instances.
def list_instances project:, zone:
  # Initialize client that will be used to send requests. This client only needs to be created
  # once, and can be reused for multiple requests.
  client = ::Google::Cloud::Compute::V1::Instances::Rest::Client.new

  # Send the request to list all VM instances in the given zone in the specified project.
  instance_list = client.list project: project, zone: zone

  puts "Instances found in zone #{zone}:"
  instances = []
  instance_list.each do |instance|
    puts " - #{instance.name} (#{instance.machine_type})"
    instances << instance
  end
  instances
end