How to move files in Google Cloud Storage from one bucket to another bucket by Python

Question

Are there any API function that allow us to move files in Google Cloud Storage from one bucket in another bucket?

The scenario is we want Python to move read files in A bucket to B bucket. I knew that gsutil could do that but not sure Python can support that or not.

Thanks.

Answer 1

Here's a function I use when moving blobs between directories within the same bucket or to a different bucket.

from google.cloud import storage
import os
    
    os.environ["GOOGLE_APPLICATION_CREDENTIALS"]="path_to_your_creds.json"

def mv_blob(bucket_name, blob_name, new_bucket_name, new_blob_name):
    """
    Function for moving files between directories or buckets. it will use GCP's copy 
    function then delete the blob from the old location.
    
    inputs
    -----
    bucket_name: name of bucket
    blob_name: str, name of file 
        ex. 'data/some_location/file_name'
    new_bucket_name: name of bucket (can be same as original if we're just moving around directories)
    new_blob_name: str, name of file in new directory in target bucket 
        ex. 'data/destination/file_name'
    """
    storage_client = storage.Client()
    source_bucket = storage_client.get_bucket(bucket_name)
    source_blob = source_bucket.blob(blob_name)
    destination_bucket = storage_client.get_bucket(new_bucket_name)

    # copy to new destination
    new_blob = source_bucket.copy_blob(
        source_blob, destination_bucket, new_blob_name)
    # delete in old destination
    source_blob.delete()
    
    print(f'File moved from {source_blob} to {new_blob_name}')

Answer 2

Using the google-api-python-client, there is an example on the storage.objects.copy page. After you copy, you can delete the source with storage.objects.delete.

destination_object_resource = {}
req = client.objects().copy(
        sourceBucket=bucket1,
        sourceObject=old_object,
        destinationBucket=bucket2,
        destinationObject=new_object,
        body=destination_object_resource)
resp = req.execute()
print json.dumps(resp, indent=2)

client.objects().delete(
        bucket=bucket1,
        object=old_object).execute()

Answer 3

you can use GCS Client Library Functions documented at [1] to read to one bucket and write to the other and then delete source file.

You can even use the GCS REST API documented at [2].

Link:
[1] - https://developers.google.com/appengine/docs/python/googlecloudstorageclient/functions
[2] - https://developers.google.com/storage/docs/concepts-techniques#overview