python - Move files between two AWS S3 buckets using boto3

Question

I have to move files between one bucket to another with Python Boto API. (I need it to "Cut" the file from the first Bucket and "Paste" it in the second one). What is the best way to do that?

** Note: Is that matter if I have two different ACCESS KEYS and SECRET KEYS?

Answer 1

If you are using boto3 (the newer boto version) this is quite simple

import boto3
s3 = boto3.resource('s3')
copy_source = {
    'Bucket': 'mybucket',
    'Key': 'mykey'
}
s3.meta.client.copy(copy_source, 'otherbucket', 'otherkey')

(Docs)

Answer 2

I think the boto S3 documentation answers your question.

https://github.com/boto/boto/blob/develop/docs/source/s3_tut.rst

Moving files from one bucket to another via boto is effectively a copy of the keys from source to destination and then removing the key from source.

You can get access to the buckets:

import boto

c = boto.connect_s3()
src = c.get_bucket('my_source_bucket')
dst = c.get_bucket('my_destination_bucket')

and iterate the keys:

for k in src.list():
    # copy stuff to your destination here
    dst.copy_key(k.key.name, src.name, k.key.name)
    # then delete the source key
    k.delete()

See also: Is it possible to copy all files from one S3 bucket to another with s3cmd?

Answer 3

awscli does the job 30 times faster for me than boto coping and deleting each key. Probably due to multithreading in awscli. If you still want to run it from your python script without calling shell commands from it, you may try something like this:

Install awscli python package:

sudo pip install awscli

And then it is as simple as this:

import os
if os.environ.get('LC_CTYPE', '') == 'UTF-8':
    os.environ['LC_CTYPE'] = 'en_US.UTF-8'

from awscli.clidriver import create_clidriver
driver = create_clidriver()
driver.main('s3 mv source_bucket target_bucket --recursive'.split())

Answer 4

If you have 2 different buckets with different access credentials. Store the credentials accordingly in credentials and config files under ~/.aws folder.

you can use the following to copy object from one bucket with different credentials and then save the object in the other bucket with different credentials:

import boto3


session_src = boto3.session.Session(profile_name=<source_profile_name>)
source_s3_r = session_src.resource('s3')

session_dest = boto3.session.Session(profile_name=<dest_profile_name>)
dest_s3_r = session_dest.resource('s3')

# create a reference to source image
old_obj = source_s3_r.Object(<source_s3_bucket_name>, <prefix_path> + <key_name>)

# create a reference for destination image
new_obj = dest_s3_r.Object(<dest_s3_bucket_name>, old_obj.key)

# upload the image to destination S3 object
new_obj.put(Body=old_obj.get()['Body'].read())

Both bucket do not need to have accessibility from each other in the ACL or the bucket policies.

Answer 5

If you want to

Create a copy of an object that is already stored in Amazon S3.

then copy_object is the way to go in boto3.

How I do it:

import boto3

aws_access_key_id = ""
aws_secret_access_key = ""
bucket_from = ""
bucket_to = ""
s3 = boto3.resource(
    's3',
    aws_access_key_id=aws_access_key_id,
    aws_secret_access_key=aws_secret_access_key
)
src = s3.Bucket(bucket_from)

def move_files():
    for archive in src.objects.all():
        # filters on archive.key might be applied here

        s3.meta.client.copy_object(
            ACL='public-read',
            Bucket=bucket_to,
            CopySource={'Bucket': bucket_from, 'Key': archive.key},
            Key=archive.key
        )

move_files()

Answer 6

Bucket name must be string not bucket object. Below change worked for me

for k in src.list():
    dst.copy_key(k.key, src.name, k.key)

Answer 7

This is code I used to move files within sub-directories of a s3 bucket

# =============================================================================
# CODE TO MOVE FILES within subfolders in S3 BUCKET
# =============================================================================

from boto3.session import Session

ACCESS_KEY = 'a_key'
SECRET_KEY = 's_key'
session = Session(aws_access_key_id=ACCESS_KEY,
            aws_secret_access_key=SECRET_KEY)
s3 = session.resource('s3')#creating session of S3 as resource


s3client = session.client('s3')

resp_dw = s3client.list_objects(Bucket='main_bucket', Prefix='sub_folder/', Delimiter="/")

forms2_dw = [x['Key'] for x in resp_dw['Contents'][1:]]#here we got all files list (max limit is 1000 at a time)
reload_no = 0
while len(forms2_dw) != 0 :

    #resp_dw = s3client.list_objects(Bucket='main_bucket', Prefix='sub_folder/', Delimiter="/")
    #with open('dw_bucket.json','w') as f:
    #    resp_dws =str(resp_dw)
       # f.write(json.dumps(resp_dws))
    #forms_dw = [x['Prefix'] for x in resp_dw['CommonPrefixes']] 
    #forms2_dw = [x['Key'] for x in resp_dw['Contents'][1:]]
    #forms2_dw[-1]
    total_files = len(forms2_dw)
    #i=0
    for i in range(total_files):
    #zip_filename='1819.zip'
        foldername = resp_dw['Contents'][1:][i]['LastModified'].strftime('%Y%m%d')#Put your logic here for folder name
        my_bcket   =  'main_bucket'

        my_file_old = resp_dw['Contents'][1:][i]['Key'] #file to be copied path
        zip_filename =my_file_old.split('/')[-1]
        subpath_nw='new_sub_folder/'+foldername+"/"+zip_filename #destination path
        my_file_new = subpath_nw
        # 
        print str(reload_no)+ ':::  copying from====:'+my_file_old+' to :====='+s3_archive_subpath_nw
        #print my_bcket+'/'+my_file_old 

        if zip_filename[-4:] == '.zip':
            s3.Object(my_bcket,my_file_new).copy_from(CopySource=my_bcket+'/'+my_file_old)
            s3.Object(my_bcket,my_file_old).delete()

            print str(i)+' files moved of '+str(total_files)

    resp_dw = s3client.list_objects(Bucket='main_bucket', Prefix='sub-folder/', Delimiter="/")

    forms2_dw = [x['Key'] for x in resp_dw['Contents'][1:]] 
    reload_no +=1