How to get file size of objects from google cloud python library?

Question

Problem

Hello everyone. I am attempting to obtain the file size of an object using the google-cloud python library. This is my current code.

from google.cloud import storage

client = storage.Client()
bucket = client.get_bucket("example-bucket-name")
object = bucket.blob("example-object-name.jpg")

print(object.exists())
>>> True

print(object.chunk_size)
>>> None

It appears to me that the google-cloud library is choosing not to load data into the attributes such as chunk_size, content_type, etc.

Question

How can I make the library explicitly load actual data into the metadata attributes of the blob, instead of defaulting everything to None?

Sudiesudnor

this question did not need the python and python-3.x tags since this is not a python issue, per se. – Lycaon

@Lycaon agreed, removed the tag. – Pleven

Answer 1

Call get_blob instead of blob.

Review the source code for the function blob_metadata at this link. It shows how to get a variety of metadata attributes of a blob, including its size.

If the above link dies, try looking around in this directory: Storage Client Samples

Darlleen

Will get_blob also download the contents of the file? Or will it only retrieve the metadata? – Sudiesudnor

To download the object, call download_to_filename(), download_as_string() or similar type of function. These are documented. pypi.org/project/google-cloud-storage and googleapis.github.io/google-cloud-python/latest/storage/… – Darlleen

@JohnHanley your link is dead, sadly. – Gehlenite

The link is dead. – Mckeever

Answer 2

Call size on Blob.

from google.cloud import storage

# create client
client: storage.client.Client = storage.Client('projectname')

# get bucket
bucket: storage.bucket.Bucket = client.get_bucket('bucketname')

size_in_bytes = bucket.get_blob('filename').size

Unplumbed

@SuperEye - The code works. I just verified that on my system. Change the projectname, bucketname, and filename. No issues. What problem did you experience? – Darlleen

Yes, this is correct, bucket.get_blob('filename').size works fine. – Mckeever