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s3.py
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s3.py
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import os
import re
import time
import boto3
import utils
s3 = boto3.client('s3')
# Load config
config = utils.read_config()
object_size_limit = config['s3']['size_limit']
storage_class_list = config['s3']['storage_class']
download_gap = utils.msec(config['s3']['download_gap'])
object_limit = config['s3']['object_limit']
object_limit_total = config['s3']['object_limit_total']
object_key_regex: re.Pattern = re.compile(config['s3']['object_key_regex']) if config['s3']['object_key_regex'] else None
object_limit_total_counter = 0
def get_buckets():
response = s3.list_buckets()
if utils.request_success(response):
utils.save_json(response, 's3/buckets.json')
print("Buckets found:", len(response['Buckets']))
bucket_names = [bucket['Name'] for bucket in response['Buckets']]
print("Buckets:", bucket_names)
return bucket_names
print('No permission to list buckets')
return []
def total_object_limit_reached():
return object_limit_total and object_limit_total != 0 and object_limit_total_counter >= object_limit_total
def bucket_details(bucket):
return s3.get_bucket_acl(Bucket=bucket)
def list_all_objects(bucket_name):
# This sends requests until all objects are returned, because only 1000 can be listed at once
response = s3.list_objects_v2(Bucket=bucket_name)
if not utils.request_success(response):
print(f'No permission to list objects in bucket {bucket_name}')
return []
objects = response['Contents']
while response['IsTruncated']:
response = s3.list_objects_v2(
Bucket=bucket_name,
ContinuationToken=response['NextContinuationToken']
)
print(objects)
objects += response['Contents']
return objects
def save_objects(bucket, objects):
object_limit = config['s3']['object_limit']
limit_text = f'(LIMIT {object_limit})' if object_limit and object_limit != 0 else ''
print(f'Saving {len(objects)} objects from bucket {bucket} {limit_text}')
for i, o in enumerate(objects):
# Verify limit
if object_limit and object_limit != 0 and i > object_limit:
print(f'! LOCAL limit of {object_limit} objects reached in bucket {bucket}. Skipping: ({len(objects)-object_limit})')
break
# Verify total limit
if total_object_limit_reached():
print(f'! GLOBAL limit of {object_limit_total} objects reached inside bucket {bucket}. Skipping ({len(objects)-object_limit}) in this bucket and all others')
break
# Verify size
key = o['Key']
if object_size_limit and object_size_limit != 0 and o['Size'] > object_size_limit:
print(f'! "{key}" is too large ({o["Size"]})')
continue
# Verify key regex
if object_key_regex and not object_key_regex.match(key):
print(f'! "{key}" does not match regex')
continue
# Verify storage class
storage_class = o['StorageClass']
if storage_class_list and storage_class not in storage_class_list:
print(f'! "{key}" is the wrong storage class ({storage_class})')
continue
path = utils.datapath(f's3/objects/{bucket}/{key}')
os.makedirs(os.path.dirname(path), exist_ok=True)
print(f'Downloading s3://{bucket}/{key} -> {path}')
s3.download_file(bucket, key, path)
if object_limit_total and object_limit_total != 0:
object_limit_total_counter += 1
if download_gap > 0:
time.sleep(download_gap)
def main():
# Auto discover buckets if enabled in config
buckets = config['s3']['include']
if config['s3']['discover']:
buckets += get_buckets()
for b in config['s3']['exclude']:
buckets.remove(b)
# Get details and list of objects for each bucket
objects = {}
for i, bucket in enumerate(buckets):
if total_object_limit_reached():
print(f'GLOBAL limit of {object_limit_total} objects reached. Skipping remaining buckets ({len(buckets)-i})')
break
response = bucket_details(bucket)
if utils.request_success(response):
utils.save_json(response, f's3/{bucket}.details.json')
else:
print(f'No permission to get details for bucket {bucket}')
objects[bucket] = list_all_objects(bucket)
utils.save_json(objects[bucket], f's3/object_lists/{bucket}.objects.json')
print(f'Found {len(objects[bucket])} objects in bucket {bucket}')
# Save all objects
os.makedirs(utils.datapath('s3/objects'), exist_ok=True)
for b in buckets:
save_objects(b, objects[b])
if __name__ == '__main__':
main()