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# Copyright (C) 2019 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU General Public License version 3, or any later version
# See top-level LICENSE file for more information
from typing import Dict, Generator, Sequence, Set
from swh.storage import get_storage
class FilteringProxyStorage:
"""Filtering Storage implementation. This is in charge of transparently
filtering out known objects prior to adding them to storage.
Sample configuration use case for filtering storage:
.. code-block: yaml
storage:
cls: filter
storage:
cls: remote
url: http://storage.internal.staging.swh.network:5002/
"""
def __init__(self, storage):
self.storage = get_storage(**storage)
self.objects_seen = {
'content': set(), # set of content hashes (sha256) seen
'directory': set(),
'revision': set(),
}
def __getattr__(self, key):
return getattr(self.storage, key)
def content_add(self, content: Sequence[Dict]) -> Dict:
contents = list(content)
contents_to_add = self._filter_missing_contents(contents)
return self.storage.content_add(
x for x in contents if x['sha256'] in contents_to_add
)
def directory_add(self, directories: Sequence[Dict]) -> Dict:
directories = list(directories)
missing_ids = self._filter_missing_ids(
'directory',
(d['id'] for d in directories)
)
return self.storage.directory_add(
d for d in directories if d['id'] in missing_ids
)
def revision_add(self, revisions):
revisions = list(revisions)
missing_ids = self._filter_missing_ids(
'revision',
(d['id'] for d in revisions)
)
return self.storage.revision_add(
r for r in revisions if r['id'] in missing_ids
)
def _filter_missing_contents(
self, content_hashes: Sequence[Dict]) -> Set[bytes]:
"""Return only the content keys missing from swh
Args:
content_hashes: List of sha256 to check for existence in swh
storage
"""
objects_seen = self.objects_seen['content']
missing_hashes = []
for hashes in content_hashes:
if hashes['sha256'] in objects_seen:
continue
objects_seen.add(hashes['sha256'])
missing_hashes.append(hashes)
return set(self.storage.content_missing(
missing_hashes,
key_hash='sha256',
))
def _filter_missing_ids(
self,
object_type: str,
ids: Generator[bytes, None, None]) -> Set[bytes]:
"""Filter missing ids from the storage for a given object type.
Args:
object_type: object type to use {revision, directory}
ids: Sequence of object_type ids
Returns:
Missing ids from the storage for object_type
"""
objects_seen = self.objects_seen[object_type]
missing_ids = []
for id in ids:
if id in objects_seen:
continue
objects_seen.add(id)
missing_ids.append(id)
fn_by_object_type = {
'revision': self.storage.revision_missing,
'directory': self.storage.directory_missing,
}
fn = fn_by_object_type[object_type]
return set(fn(missing_ids))

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