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?

this question did not need the `python` and `python-3.x` tags since this is not a python issue, per se. — Skaperen, Aug 08 '19 at 00:56

score 6 · Accepted Answer · edited Aug 04 '21 at 22:11

6

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

edited Aug 04 '21 at 22:11

Stephen

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answered Aug 08 '19 at 00:57

John Hanley

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Will `get_blob` also download the contents of the file? Or will it only retrieve the metadata? – AlanSTACK Aug 08 '19 at 02:27
To download the object, call `download_to_filename()`, `download_as_string()` or similar type of function. These are documented. https://pypi.org/project/google-cloud-storage/ and https://googleapis.github.io/google-cloud-python/latest/storage/blobs.html – John Hanley Aug 08 '19 at 03:29
1

@JohnHanley your link is dead, sadly. – Robino Sep 29 '20 at 16:34
The link is dead. – london_utku Apr 25 '21 at 21:33

score 5 · Answer 2 · answered Oct 31 '20 at 10:57

5

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

answered Oct 31 '20 at 10:57

orby

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@SuperEye - The code works. I just verified that on my system. Change the projectname, bucketname, and filename. No issues. What problem did you experience? – John Hanley Apr 25 '21 at 22:20
Yes, this is correct, bucket.get_blob('filename').size works fine. – london_utku Apr 26 '21 at 07:13

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

Problem

Question

2 Answers2