Paiements du demandeur : télécharger un objet

Téléchargez un fichier en utilisant le projet spécifié en tant que demandeur.

En savoir plus

Pour obtenir une documentation détaillée incluant cet exemple de code, consultez la page suivante :

Utiliser les paiements du demandeur

Exemple de code

C++

Pour en savoir plus, consultez la documentation de référence de l'API Cloud Storage en langage C++.

Pour vous authentifier auprès de Cloud Storage, configurez le service Identifiants par défaut de l'application. Pour en savoir plus, consultez Configurer l'authentification pour un environnement de développement local.

namespace gcs = ::google::cloud::storage;
[](gcs::Client client, std::string const& bucket_name,
   std::string const& object_name, std::string const& billed_project) {
  gcs::ObjectReadStream stream = client.ReadObject(
      bucket_name, object_name, gcs::UserProject(billed_project));

  std::string line;
  while (std::getline(stream, line, '\n')) {
    std::cout << line << "\n";
  }
  if (stream.bad()) throw google::cloud::Status(stream.status());
}

C#

Pour en savoir plus, consultez la documentation de référence de l'API Cloud Storage en langage C#.


using Google.Cloud.Storage.V1;
using System;
using System.IO;

public class DownloadFileRequesterPaysSample
{
    public void DownloadFileRequesterPays(
        string projectId = "your-project-id",
        string bucketName = "your-unique-bucket-name",
        string objectName = "my-file-name",
        string localPath = "my-local-path/my-file-name")
    {
        var storage = StorageClient.Create();
        using var outputFile = File.OpenWrite(localPath);
        storage.DownloadObject(bucketName, objectName, outputFile, new DownloadObjectOptions
        {
            UserProject = projectId
        });
        Console.WriteLine($"Downloaded {objectName} to {localPath} paid by {projectId}.");
    }
}

Go

Pour en savoir plus, consultez la documentation de référence de l'API Cloud Storage en langage Go.

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

	"cloud.google.com/go/storage"
)

// downloadUsingRequesterPays downloads an object using billing project.
func downloadUsingRequesterPays(w io.Writer, bucket, object, billingProjectID string) error {
	// bucket := "bucket-name"
	// object := "object-name"
	// billingProjectID := "billing_account_id"
	ctx := context.Background()
	client, err := storage.NewClient(ctx)
	if err != nil {
		return fmt.Errorf("storage.NewClient: %w", err)
	}
	defer client.Close()

	b := client.Bucket(bucket).UserProject(billingProjectID)
	src := b.Object(object)

	// Open local file.
	f, err := os.OpenFile("notes.txt", os.O_RDWR|os.O_CREATE, 0755)
	if err != nil {
		return fmt.Errorf("os.OpenFile: %w", err)
	}

	ctx, cancel := context.WithTimeout(ctx, time.Second*50)
	defer cancel()

	rc, err := src.NewReader(ctx)
	if err != nil {
		return fmt.Errorf("Object(%q).NewReader: %w", object, err)
	}
	if _, err := io.Copy(f, rc); err != nil {
		return fmt.Errorf("io.Copy: %w", err)
	}
	if err := rc.Close(); err != nil {
		return fmt.Errorf("Reader.Close: %w", err)
	}
	fmt.Fprintf(w, "Downloaded using %v as billing project.\n", billingProjectID)
	return nil
}

Java

Pour en savoir plus, consultez la documentation de référence de l'API Cloud Storage en langage Java.


import com.google.cloud.storage.Blob;
import com.google.cloud.storage.BlobId;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;
import java.nio.file.Path;

public class DownloadRequesterPaysObject {
  public static void downloadRequesterPaysObject(
      String projectId, String bucketName, String objectName, Path destFilePath) {
    // The project ID to bill
    // String projectId = "my-billable-project-id";

    // The ID of your GCS bucket
    // String bucketName = "your-unique-bucket-name";

    // The ID of your GCS object
    // String objectName = "your-object-name";

    // The path to which the file should be downloaded
    // Path destFilePath = Paths.get("/local/path/to/file.txt");

    Storage storage = StorageOptions.getDefaultInstance().getService();
    Blob blob =
        storage.get(
            BlobId.of(bucketName, objectName), Storage.BlobGetOption.userProject(projectId));
    blob.downloadTo(destFilePath, Blob.BlobSourceOption.userProject(projectId));

    System.out.println(
        "Object " + objectName + " downloaded to " + destFilePath + " and billed to " + projectId);
  }
}

Node.js

Pour en savoir plus, consultez la documentation de référence de l'API Cloud Storage en langage Node.js.


/**
 * TODO(developer): Uncomment the following lines before running the sample.
 */
// The project ID to bill
// const projectId = 'my-billable-project-id';

// The ID of your GCS bucket
// const bucketName = 'your-unique-bucket-name';

// The ID of your GCS file
// const srcFileName = 'your-file-name';

// The path to which the file should be downloaded
// const destFileName = '/local/path/to/file.txt';

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

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

async function downloadFileUsingRequesterPays() {
  const options = {
    destination: destFileName,
    userProject: projectId,
  };

  // Downloads the file
  await storage.bucket(bucketName).file(srcFileName).download(options);

  console.log(
    `gs://${bucketName}/${srcFileName} downloaded to ${destFileName} using requester-pays requests`
  );
}

downloadFileUsingRequesterPays().catch(console.error);

PHP

Pour en savoir plus, consultez la documentation de référence de l'API Cloud Storage en langage PHP.

use Google\Cloud\Storage\StorageClient;

/**
 * Download file using specified project as requester
 *
 * @param string $projectId The ID of your Google Cloud Platform project.
 *        (e.g. 'my-project-id')
 * @param string $bucketName The name of your Cloud Storage bucket.
 *        (e.g. 'my-bucket')
 * @param string $objectName The name of your Cloud Storage object.
 *        (e.g. 'my-object')
 * @param string $destination The local destination to save the object.
 *        (e.g. '/path/to/your/file')
 */
function download_file_requester_pays(string $projectId, string $bucketName, string $objectName, string $destination): void
{
    $storage = new StorageClient([
        'projectId' => $projectId
    ]);
    $userProject = true;
    $bucket = $storage->bucket($bucketName, $userProject);
    $object = $bucket->object($objectName);
    $object->downloadToFile($destination);
    printf('Downloaded gs://%s/%s to %s using requester-pays requests.' . PHP_EOL,
        $bucketName, $objectName, basename($destination));
}

Python

Pour en savoir plus, consultez la documentation de référence de l'API Cloud Storage en langage Python.

from google.cloud import storage


def download_file_requester_pays(
    bucket_name, project_id, source_blob_name, destination_file_name
):
    """Download file using specified project as the requester"""
    # bucket_name = "your-bucket-name"
    # project_id = "your-project-id"
    # source_blob_name = "source-blob-name"
    # destination_file_name = "local-destination-file-name"

    storage_client = storage.Client()

    bucket = storage_client.bucket(bucket_name, user_project=project_id)
    blob = bucket.blob(source_blob_name)
    blob.download_to_filename(destination_file_name)

    print(
        "Blob {} downloaded to {} using a requester-pays request.".format(
            source_blob_name, destination_file_name
        )
    )

Ruby

Pour en savoir plus, consultez la documentation de référence de l'API Cloud Storage en langage Ruby.

def download_file_requester_pays bucket_name:, file_name:, local_file_path:
  # The ID of a GCS bucket
  # bucket_name = "your-unique-bucket-name"

  # The ID of a GCS object
  # file_name = "your-file-name"

  # The path to which the file should be downloaded
  # local_file_path = "/local/path/to/file.txt"

  require "google/cloud/storage"

  storage = Google::Cloud::Storage.new
  bucket  = storage.bucket bucket_name, skip_lookup: true, user_project: true
  file    = bucket.file file_name

  file.download local_file_path

  puts "Downloaded #{file.name} using billing project #{storage.project}"
end

Étapes suivantes

Pour rechercher et filtrer des exemples de code pour d'autres produits Google Cloud, consultez l'explorateur d'exemples Google Cloud.