Kopieren Sie eine archivierte Generierung eines Objekts in einem Cloud Storage-Bucket kopieren.
Weitere Informationen
Eine ausführliche Dokumentation, die dieses Codebeispiel enthält, finden Sie hier:
Codebeispiel
C++
Weitere Informationen finden Sie in der Referenzdokumentation zur Cloud Storage C++ API.
namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& source_bucket_name,
std::string const& source_object_name,
std::string const& destination_bucket_name,
std::string const& destination_object_name,
std::int64_t source_object_generation) {
StatusOr<gcs::ObjectMetadata> copy =
client.CopyObject(source_bucket_name, source_object_name,
destination_bucket_name, destination_object_name,
gcs::SourceGeneration{source_object_generation});
if (!copy) throw std::move(copy).status();
std::cout << "Successfully copied " << source_object_name << " generation "
<< source_object_generation << " in bucket " << source_bucket_name
<< " to bucket " << copy->bucket() << " with name "
<< copy->name()
<< ".\nThe full metadata after the copy is: " << *copy << "\n";
}C#
Weitere Informationen finden Sie in der Referenzdokumentation zur Cloud Storage C# API.
using Google.Cloud.Storage.V1;
using System;
public class CopyFileArchivedGenerationSample
{
public Google.Apis.Storage.v1.Data.Object CopyFileArchivedGeneration(
string sourceBucketName = "source-bucket-name",
string sourceObjectName = "source-file",
string destBucketName = "destination-bucket-name",
string destObjectName = "destination-file-name",
long? generation = 1579287380533984)
{
var storage = StorageClient.Create();
var copyOptions = new CopyObjectOptions
{
SourceGeneration = generation
};
var copiedFile = storage.CopyObject(sourceBucketName, sourceObjectName,
destBucketName, destObjectName, copyOptions);
Console.WriteLine($"Generation {generation} of the object {sourceBucketName}/{sourceObjectName} " +
$"was copied to to {destBucketName}/{destObjectName}.");
return copiedFile;
}
}Go
Weitere Informationen finden Sie in der Referenzdokumentation zur Cloud Storage Go API.
import (
"context"
"fmt"
"io"
"time"
"cloud.google.com/go/storage"
)
// copyOldVersionOfObject copies a noncurrent version of an object.
func copyOldVersionOfObject(w io.Writer, bucket, srcObject, dstObject string, gen int64) error {
// bucket := "bucket-name"
// srcObject := "source-object-name"
// dstObject := "destination-object-name"
// gen is the generation of srcObject to copy.
// gen := 1587012235914578
ctx := context.Background()
client, err := storage.NewClient(ctx)
if err != nil {
return fmt.Errorf("storage.NewClient: %v", err)
}
defer client.Close()
ctx, cancel := context.WithTimeout(ctx, time.Second*10)
defer cancel()
src := client.Bucket(bucket).Object(srcObject)
dst := client.Bucket(bucket).Object(dstObject)
// Optional: set a generation-match precondition to avoid potential race
// conditions and data corruptions. The request to copy is aborted if the
// object's generation number does not match your precondition.
// For a dst object that does not yet exist, set the DoesNotExist precondition.
dst = dst.If(storage.Conditions{DoesNotExist: true})
// If the destination object already exists in your bucket, set instead a
// generation-match precondition using its generation number.
// attrs, err := dst.Attrs(ctx)
// if err != nil {
// return fmt.Errorf("object.Attrs: %v", err)
// }
// dst = dst.If(storage.Conditions{GenerationMatch: attrs.Generation})
if _, err := dst.CopierFrom(src.Generation(gen)).Run(ctx); err != nil {
return fmt.Errorf("Object(%q).CopierFrom(%q).Generation(%v).Run: %v", dstObject, srcObject, gen, err)
}
fmt.Fprintf(w, "Generation %v of object %v in bucket %v was copied to %v\n", gen, srcObject, bucket, dstObject)
return nil
}
Java
Weitere Informationen finden Sie in der Referenzdokumentation zur Cloud Storage Java API.
import com.google.cloud.storage.BlobId;
import com.google.cloud.storage.Storage;
import com.google.cloud.storage.StorageOptions;
public class CopyOldVersionOfObject {
public static void copyOldVersionOfObject(
String projectId,
String bucketName,
String objectToCopy,
long generationToCopy,
String newObjectName) {
// The ID of your GCP project
// String projectId = "your-project-id";
// The ID of your GCS bucket
// String bucketName = "your-unique-bucket-name";
// The ID of the GCS object to copy an old version of
// String objectToCopy = "your-object-name";
// The generation of objectToCopy to copy
// long generationToCopy = 1579287380533984;
// What to name the new object with the old data from objectToCopy
// String newObjectName = "your-new-object";
Storage storage = StorageOptions.newBuilder().setProjectId(projectId).build().getService();
// Optional: set a generation-match precondition to avoid potential race
// conditions and data corruptions. The request returns a 412 error if the
// preconditions are not met.
Storage.BlobTargetOption precondition;
if (storage.get(bucketName, newObjectName) == null) {
// For a target object that does not yet exist, set the DoesNotExist precondition.
// This will cause the request to fail if the object is created before the request runs.
precondition = Storage.BlobTargetOption.doesNotExist();
} else {
// If the destination already exists in your bucket, instead set a generation-match
// precondition. This will cause the request to fail if the existing object's generation
// changes before the request runs.
precondition =
Storage.BlobTargetOption.generationMatch(
storage.get(bucketName, newObjectName).getGeneration());
}
Storage.CopyRequest copyRequest =
Storage.CopyRequest.newBuilder()
.setSource(BlobId.of(bucketName, objectToCopy, generationToCopy))
.setTarget(BlobId.of(bucketName, newObjectName), precondition)
.build();
storage.copy(copyRequest);
System.out.println(
"Generation "
+ generationToCopy
+ " of object "
+ objectToCopy
+ " in bucket "
+ bucketName
+ " was copied to "
+ newObjectName);
}
}Node.js
Weitere Informationen finden Sie in der Referenzdokumentation zur Cloud Storage Node.js API.
/**
* TODO(developer): Uncomment the following lines before running the sample.
*/
// The ID of your GCS bucket
// const srcBucketName = "your-unique-bucket-name";
// The ID of the GCS file to copy an old version of
// const srcFilename = "your-file-name";
// The generation of fileToCopy to copy
// const generation = 1579287380533984;
// The ID of the bucket to copy the file to
// const destBucketName = 'target-file-bucket';
// What to name the new file with the old data from srcFilename
// const destFileName = "your-new-file";
// Imports the Google Cloud client library
const {Storage} = require('@google-cloud/storage');
// Creates a client
const storage = new Storage();
async function copyOldVersionOfFile() {
// Copies the file to the other bucket
// Optional:
// Set a generation-match precondition to avoid potential race conditions
// and data corruptions. The request to copy is aborted if the object's
// generation number does not match your precondition. For a destination
// object that does not yet exist, set the ifGenerationMatch precondition to 0
// If the destination object already exists in your bucket, set instead a
// generation-match precondition using its generation number.
const copyOptions = {
preconditionOpts: {
ifGenerationMatch: destinationGenerationMatchPrecondition,
},
};
await storage
.bucket(srcBucketName)
.file(srcFilename, {
generation,
})
.copy(storage.bucket(destBucketName).file(destFileName), copyOptions);
console.log(
`Generation ${generation} of file ${srcFilename} in bucket ${srcBucketName} was copied to ${destFileName} in bucket ${destBucketName}`
);
}
copyOldVersionOfFile().catch(console.error);PHP
Weitere Informationen finden Sie in der Referenzdokumentation zur Cloud Storage PHP API.
use Google\Cloud\Storage\StorageClient;
/**
* Copy archived generation of a given object to a new object.
*
* @param string $bucketName The name of your Cloud Storage bucket.
* (e.g. 'my-bucket')
* @param string $objectToCopy The name of the object to copy.
* (e.g. 'my-object')
* @param string $generationToCopy The generation of the object to copy.
* (e.g. 1579287380533984)
* @param string $newObjectName The name of the target object.
* (e.g. 'my-object-1579287380533984')
*/
function copy_file_archived_generation(string $bucketName, string $objectToCopy, string $generationToCopy, string $newObjectName): void
{
$storage = new StorageClient();
$bucket = $storage->bucket($bucketName);
$object = $bucket->object($objectToCopy, [
'generation' => $generationToCopy,
]);
$object->copy($bucket, [
'name' => $newObjectName,
]);
printf(
'Generation %s of object %s in bucket %s was copied to %s',
$generationToCopy,
$objectToCopy,
$bucketName,
$newObjectName
);
}Python
Weitere Informationen finden Sie in der Referenzdokumentation zur Cloud Storage Python API.
from google.cloud import storage
def copy_file_archived_generation(
bucket_name, blob_name, destination_bucket_name, destination_blob_name, generation
):
"""Copies a blob from one bucket to another with a new name with the same generation."""
# bucket_name = "your-bucket-name"
# blob_name = "your-object-name"
# destination_bucket_name = "destination-bucket-name"
# destination_blob_name = "destination-object-name"
# generation = 1579287380533984
storage_client = storage.Client()
source_bucket = storage_client.bucket(bucket_name)
source_blob = source_bucket.blob(blob_name)
destination_bucket = storage_client.bucket(destination_bucket_name)
# Optional: set a generation-match precondition to avoid potential race conditions
# and data corruptions. The request to copy is aborted if the object's
# generation number does not match your precondition. For a destination
# object that does not yet exist, set the if_generation_match precondition to 0.
# If the destination object already exists in your bucket, set instead a
# generation-match precondition using its generation number.
destination_generation_match_precondition = 0
# source_generation selects a specific revision of the source object, as opposed to the latest version.
blob_copy = source_bucket.copy_blob(
source_blob, destination_bucket, destination_blob_name, source_generation=generation, if_generation_match=destination_generation_match_precondition
)
print(
"Generation {} of the blob {} in bucket {} copied to blob {} in bucket {}.".format(
generation,
source_blob.name,
source_bucket.name,
blob_copy.name,
destination_bucket.name,
)
)
Ruby
Weitere Informationen finden Sie in der Referenzdokumentation zur Cloud Storage Ruby API.
def copy_file_archived_generation source_bucket_name:,
source_file_name:,
generation:,
destination_bucket_name:,
destination_file_name:
# The ID of the bucket the original object is in
# source_bucket_name = "source-bucket-name"
# The ID of the GCS object to copy
# source_file_name = "source-file-name"
# The generation of your GCS object to copy
# generation = 1579287380533984
# The ID of the bucket to copy the object to
# destination_bucket_name = "destination-bucket-name"
# The ID of the new GCS object
# destination_file_name = "destination-file-name"
require "google/cloud/storage"
storage = Google::Cloud::Storage.new
source_bucket = storage.bucket source_bucket_name, skip_lookup: true
source_file = source_bucket.file source_file_name
destination_bucket = storage.bucket destination_bucket_name, skip_lookup: true
destination_file = source_file.copy destination_bucket, destination_file_name, generation: generation
puts "Generation #{generation} of the file #{source_file.name} in bucket #{source_bucket.name} copied to file " \
"#{destination_file.name} in bucket #{destination_bucket.name}"
endNächste Schritte
Informationen zum Suchen und Filtern von Codebeispielen für andere Google Cloud-Produkte finden Sie im Google Cloud-Beispielbrowser.