返回在过去24小时内修改过的Amazon S3存储桶中的所有密钥

Question

Here is the situation: I work remotely and most days people are adding datasets to the our Amazon S3 instance. Each of these datasets require some very similar processing tasks, which I am able to automate with some pretty simple python. However, I cannot seem to isolate the datasets that have been added to the S3 in the past 24 hours using the modified date. Here is what I have so far:

import boto3 
from boto3.session import Session
ACCESS_KEY = xxxx
SECRET_KEY = xxxx
session = Session(aws_access_key_id=ACCESS_KEY, 
aws_secret_access_key=SECRET_KEY)
s3 = session.resource('s3')
s3_client = boto3.client('s3')
def get_all_s3_keys(bucket):
    keys = []
    kwargs = {'Bucket': bucket}
    while True:
        resp = s3_client.list_objects_v2(**kwargs)
        for obj in resp['Contents']:
            keys.append(obj['Key'])
        try:
            kwargs['ContinuationToken'] = resp['NextContinuationToken']
        except KeyError:
            break
    return keys

bucket_keys = get_all_s3_keys('mybucket')
recnt_keys = [key for key in bucket_keys if 'Temp' in key]

This will return all keys in 'mybucket' containing the word "Temp", but this obviously doesn't help me with the modified date. Once I get the list of recently modified keys, I want to be able to iterate through and download them to a predetermined local path.

Any thoughts?

Thanks

Answer 1

Try this snippet (just get all items and then filter):

import boto3
import datetime

s3 = boto3.resource('s3')
s3_bucket = s3.Bucket('mybucket')
items = [item for item in s3_bucket.objects.filter()] # get them all
now = datetime.datetime.now(datetime.timezone.utc)
td = datetime.timedelta(hours=24)
last_24_hours_keys = [item.key for item in items if now - item.last_modified < td] # filter

HTH.

Answer 2

Wow! Thanks for the advice @Matt Messersmith. I am using Python 2 (dang Esri python installation - but I need arcpy). I will add the slight adjustments for python 2 below. Had to use pytz instead of datetime.timezone.utc.

s3 = boto3.resource('s3')  s3_bucket = s3.Bucket('bucket') 
items = [item for item in s3_bucket.objects.filter()]  
now = datetime.datetime.now(pytz.utc)  
td = datetime.timedelta(hours=24)  
last_24_hours_keys = [item.key for item in items if now - item.last_modified < td]  
print last_24_hours_keys