List archived generations

List archived generations for an object in a Cloud Storage bucket.

Explore further

For detailed documentation that includes this code sample, see the following:

• Use versioned objects

Code sample

C++

For more information, see the Cloud Storage C++ API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

namespace gcs = ::google::cloud::storage;
[](gcs::Client client, std::string const& bucket_name) {
  for (auto&& object_metadata :
       client.ListObjects(bucket_name, gcs::Versions{true})) {
    if (!object_metadata) throw std::move(object_metadata).status();

    std::cout << "bucket_name=" << object_metadata->bucket()
              << ", object_name=" << object_metadata->name()
              << ", generation=" << object_metadata->generation() << "\n";
  }
}

C#

For more information, see the Cloud Storage C# API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

using Google.Cloud.Storage.V1;
using System;
using System.Collections.Generic;

public class ListFileArchivedGenerationSample
{
	public IEnumerable<Google.Apis.Storage.v1.Data.Object> ListFileArchivedGeneration(string bucketName = "your-bucket-name")
	{
		var storage = StorageClient.Create();

		var storageObjects = storage.ListObjects(bucketName, options: new ListObjectsOptions
		{
			Versions = true
		});

		foreach (var storageObject in storageObjects)
		{
			Console.WriteLine($"Filename: {storageObject.Name}, Generation: {storageObject.Generation}");
		}

		return storageObjects;
	}
}

Go

For more information, see the Cloud Storage Go API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

import (
	"context"
	"fmt"
	"io"
	"time"

	"cloud.google.com/go/storage"
	"google.golang.org/api/iterator"
)

// listFilesAllVersion lists both live and noncurrent versions of objects within specified bucket.
func listFilesAllVersion(w io.Writer, bucket string) error {
	// bucket := "bucket-name"
	ctx := context.Background()
	client, err := storage.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("storage.NewClient: %w", err)
	}
	defer client.Close()

	ctx, cancel := context.WithTimeout(ctx, time.Second*10)
	defer cancel()

	it := client.Bucket(bucket).Objects(ctx, &storage.Query{
		// Versions true to output all generations of objects
		Versions: true,
	})
	for {
		attrs, err := it.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return fmt.Errorf("Bucket(%q).Objects(): %w", bucket, err)
		}
		fmt.Fprintln(w, attrs.Name, attrs.Generation, attrs.Metageneration)
	}
	return nil
}

Java

For more information, see the Cloud Storage Java API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

import com.google.api.gax.paging.Page;
import com.google.cloud.storage.Blob;
import com.google.cloud.storage.Bucket;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;

public class ListObjectsWithOldVersions {
  public static void listObjectsWithOldVersions(String projectId, String bucketName) {
    // The ID of your GCP project
    // String projectId = "your-project-id";

    // The ID of your GCS bucket
    // String bucketName = "your-unique-bucket-name";
    Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();
    Bucket bucket = storage.get(bucketName);
    Page<Blob> blobs = bucket.list(Storage.BlobListOption.versions(true));

    for (Blob blob : blobs.iterateAll()) {
      System.out.println(blob.getName() + "," + blob.getGeneration());
    }
  }
}

Node.js

For more information, see the Cloud Storage Node.js API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The ID of your GCS bucket
// const bucketName = 'your-unique-bucket-name';

// Imports the Google Cloud client library
const {Storage} = require('@google-cloud/storage');

// Creates a client
const storage = new Storage();

async function listFilesWithOldVersions() {
  const [files] = await storage.bucket(bucketName).getFiles({
    versions: true,
  });

  console.log('Files:');
  files.forEach(file => {
    console.log(file.name, file.generation);
  });
}

listFilesWithOldVersions().catch(console.error);

PHP

For more information, see the Cloud Storage PHP API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

use Google\Cloud\Storage\StorageClient;

/**
 * List objects in a specified bucket with all archived generations.
 *
 * @param string $bucketName The name of your Cloud Storage bucket.
 *        (e.g. 'my-bucket')
 */
function list_file_archived_generations(string $bucketName): void
{
    $storage = new StorageClient();
    $bucket = $storage->bucket($bucketName);

    $objects = $bucket->objects([
        'versions' => true,
    ]);

    foreach ($objects as $object) {
        print($object->name() . ',' . $object->info()['generation'] . PHP_EOL);
    }
}

Python

For more information, see the Cloud Storage Python API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

from google.cloud import storage


def list_file_archived_generations(bucket_name):
    """Lists all the blobs in the bucket with generation."""
    # bucket_name = "your-bucket-name"

    storage_client = storage.Client()

    blobs = storage_client.list_blobs(bucket_name, versions=True)

    for blob in blobs:
        print(f"{blob.name},{blob.generation}")

Ruby

For more information, see the Cloud Storage Ruby API reference documentation.

To authenticate to Cloud Storage, set up Application Default Credentials. For more information, see Set up authentication for client libraries.

def list_file_archived_generations bucket_name:
  # The ID of your GCS bucket
  # bucket_name = "your-unique-bucket-name"

  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new
  bucket = storage.bucket bucket_name

  bucket.files.each do |file|
    puts "#{file.name},#{file.generation}"
  end
end

What's next

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