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from django.conf import settings
from django.core.management.base import BaseCommand
import logging
import datetime
from fnmatch import fnmatch
from boto.s3.connection import S3Connection
from boto.s3 import deletemarker,key
logging.getLogger().setLevel(logging.INFO)
class Command(BaseCommand):
help = 'Mark files as deleted or delete files for good, which are older \
than X days'
@staticmethod
def add_arguments(parser):
parser.add_argument('--dryrun', action='store_true',
help='Do not perform any actions, just report')
parser.add_argument('--markdays', default=90,
help='Number of days to mark files as deleted')
parser.add_argument('--deletedays', default=180,
help='Number of days to delete files for good')
parser.add_argument('--prefix', default='snapshots/aarch64laptops',
help='Custom prefix path')
parser.add_argument('-V', '--verbose', action='store_true',
help='log detailed information on actions to INFO')
@staticmethod
def x_days_ago(days):
date = datetime.datetime.now() - datetime.timedelta(days=days)
return date.isoformat()
@staticmethod
def print_key(key):
if key.is_latest:
latest = "*"
else:
latest = " "
if isinstance(key, deletemarker.DeleteMarker):
dm = "DEL"
else:
dm = " "
return '%s: %s %s(%s) %s' % (key.name, dm, latest,key.last_modified, key.version_id)
@staticmethod
def delete_objects(bucket, delete_list, excludes_list=[], dryrun=True, verbose=False):
if verbose:
for x in delete_list:
if isinstance(x, key.Key) or isinstance(x, deletemarker.DeleteMarker):
logging.info("deleting: %s %s" % (x.name,x.version_id))
else:
logging.info("deleting: %s" % (x))
if not dryrun:
bucket.delete_keys(delete_list)
else:
logging.info( "DRYRUN: delete_keys for %s keys" % len(delete_list) )
def handle(self, *args, **options):
conn = S3Connection(settings.AWS_ACCESS_KEY_ID,
settings.AWS_SECRET_ACCESS_KEY)
bucket = conn.get_bucket(settings.S3_BUCKET, validate=False)
now_mark = self.x_days_ago(int(options['markdays']))
now_delete = self.x_days_ago(int(options['deletedays']))
bucket_keys = bucket.list_versions(options['prefix'])
objs = {}
delete_list = []
if options['verbose']:
logging.info( "Delete day: %s" % now_delete)
logging.info( "Mark day: %s" % now_mark)
for key in bucket_keys:
if options['verbose']:
logging.info(self.print_key(key))
if key.name not in objs:
objs[key.name] = {'last':None, 'delete':None}
# flatten everything by filtering out everything except the
# latest versions of the key and/or deletemarker
if isinstance(key, deletemarker.DeleteMarker):
if objs[key.name]['delete'] is None:
objs[key.name]['delete'] = key
elif key.last_modified > objs[key.name]['delete'].last_modified:
delete_list.append(objs[key.name]['delete'])
objs[key.name]['delete'] = key
else:
delete_list.append(key)
else:
if objs[key.name]['last'] is None:
objs[key.name]['last'] = key
elif key.last_modified > objs[key.name]['last'].last_modified:
delete_list.append(objs[key.name]['last'])
objs[key.name]['last'] = key
else:
delete_list.append(key)
# if the new 'last' is newer than an existing deletemarker,
# delete the deletemarker
if objs[key.name]['delete'] and \
objs[key.name]['last'].last_modified >= objs[key.name]['delete'].last_modified:
delete_list.append(objs[key.name]['delete'])
objs[key.name]['delete'] = None
# purge as we go
if len(delete_list) > 1000:
while delete_list:
self.delete_objects(bucket, delete_list[0:1000], settings.S3_PURGE_EXCLUDES, options['dryrun'], options['verbose'])
delete_list = delete_list[1000:]
if options['verbose']:
logging.info("done with flatten")
# search through everything w/ a delete marker to delete
for candidate in [ x for x in objs if objs[x]['delete']]:
# if in exclude we ignore it even if it has a delete marker
if any(fnmatch(candidate, p) for p in settings.S3_PURGE_EXCLUDES):
if options['verbose']:
logging.info("excluded: %s" % candidate)
continue
else:
if objs[candidate]['last'] is None:
# no point in keeping around a delete marker that points to nothing
delete_list.append(objs[candidate]['delete'])
else:
# check last_modified on the last real file, not delete marker
if objs[candidate]['last'].last_modified < now_delete:
delete_list.append(objs[candidate]['delete'])
delete_list.append(objs[candidate]['last'])
if options['verbose']:
logging.info("done with now_delete")
# search through everything w/o a delete marker to possibly mark
for candidate in [ x for x in objs if not objs[x]['delete']]:
if any(fnmatch(candidate, p) for p in settings.S3_PURGE_EXCLUDES):
if options['verbose']:
logging.info("excluded: %s" % candidate)
continue
else:
if objs[candidate]['last'].last_modified < now_mark:
if not options['dryrun']:
# by appending only the name rather than the key
# object, S3 should insert a delete marker
delete_list.append(objs[candidate]['last'].name)
else:
logging.info("DRYRUN: setting deletemarker on %s - %s" % (objs[candidate]['last'].name, objs[candidate]['last'].version_id))
if options['verbose']:
logging.info("done with now_mark")
while len(delete_list) > 1000:
self.delete_objects(bucket, delete_list[0:1000], settings.S3_PURGE_EXCLUDES, options['dryrun'], options['verbose'])
delete_list = delete_list[1000:]
self.delete_objects(bucket, delete_list[0:1000], settings.S3_PURGE_EXCLUDES, options['dryrun'], options['verbose'])
if options['verbose']:
logging.info("done with cleanup.")
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