存储在 Amazon S3 存储桶上的文件大小

Question

I have following model

class MediaFile(Media):
    s3_file = GenericFileField(tag="s3-tag", null=True, blank=True, max_length=300)

How can I get size of file stored on s3?

I tried this, but it's not work.

    def file_size(self):
        try:
            prefix = get_file_key(self.s3_file)
            s3 = boto3.resource("s3")
            bucket = s3.Bucket()
            return bucket.Object(prefix).content_length
        except:
            pass

Answer 1

To access an existing Bucket using boto3, you need to supply the bucket name, for example:

import boto3
s3 = boto3.resource("s3")
bucket = s3.Bucket('mybucket')
length = bucket.Object('cats/persian.jpg').content_length

Alternatively:

import boto3
s3 = boto3.resource("s3")
length = s3.Object('mybucket', 'cats/persian.jpg').content_length

FYI the value passed to Bucket.Object() is a key (like cats/persian.jpg ), not a prefix (like cats/ ).