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# Copyright (C) 2015-2019 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 collections import defaultdict
import copy
from concurrent.futures import ThreadPoolExecutor
from contextlib import contextmanager
import datetime
import itertools
import json
import dateutil.parser
import psycopg2
import psycopg2.pool
from . import converters
from .common import db_transaction_generator, db_transaction
from .db import Db
from .exc import StorageDBError
from .algos import diff
from swh.model.hashutil import ALGORITHMS, hash_to_bytes
from swh.objstorage import get_objstorage
from swh.objstorage.exc import ObjNotFoundError
try:
from swh.journal.writer import get_journal_writer
except ImportError:
get_journal_writer = None # type: ignore
# mypy limitation, see https://github.com/python/mypy/issues/1153
# Max block size of contents to return
BULK_BLOCK_CONTENT_LEN_MAX = 10000
EMPTY_SNAPSHOT_ID = hash_to_bytes('1a8893e6a86f444e8be8e7bda6cb34fb1735a00e')
"""Identifier for the empty snapshot"""
class Storage():
"""SWH storage proxy, encompassing DB and object storage
"""
def __init__(self, db, objstorage, min_pool_conns=1, max_pool_conns=10,
journal_writer=None):
"""
Args:
db_conn: either a libpq connection string, or a psycopg2 connection
obj_root: path to the root of the object storage
"""
try:
if isinstance(db, psycopg2.extensions.connection):
self._pool = None
self._db = Db(db)
else:
self._pool = psycopg2.pool.ThreadedConnectionPool(
min_pool_conns, max_pool_conns, db
)
self._db = None
except psycopg2.OperationalError as e:
raise StorageDBError(e)
self.objstorage = get_objstorage(**objstorage)
if journal_writer:
if get_journal_writer is None:
raise EnvironmentError(
'You need the swh.journal package to use the '
'journal_writer feature')
self.journal_writer = get_journal_writer(**journal_writer)
else:
self.journal_writer = None
def get_db(self):
if self._db:
return self._db
else:
return Db.from_pool(self._pool)
def put_db(self, db):
if db is not self._db:
db.put_conn()
@contextmanager
def db(self):
db = None
try:
db = self.get_db()
yield db
finally:
if db:
self.put_db(db)
@db_transaction()
def check_config(self, *, check_write, db, cur):
"""Check that the storage is configured and ready to go."""
if not self.objstorage.check_config(check_write=check_write):
return False
# Check permissions on one of the tables
if check_write:
check = 'INSERT'
else:
check = 'SELECT'
cur.execute(
"select has_table_privilege(current_user, 'content', %s)",
(check,)
)
return cur.fetchone()[0]
def _content_unique_key(self, hash, db):
"""Given a hash (tuple or dict), return a unique key from the
aggregation of keys.
"""
keys = db.content_hash_keys
if isinstance(hash, tuple):
return hash
return tuple([hash[k] for k in keys])
@staticmethod
def _normalize_content(d):
d = d.copy()
if 'status' not in d:
d['status'] = 'visible'
if 'length' not in d:
d['length'] = -1
return d
@staticmethod
def _validate_content(d):
"""Sanity checks on status / reason / length, that postgresql
doesn't enforce."""
if d['status'] not in ('visible', 'absent', 'hidden'):
raise ValueError('Invalid content status: {}'.format(d['status']))
if d['status'] != 'absent' and d.get('reason') is not None:
raise ValueError(
'Must not provide a reason if content is not absent.')
if d['length'] < -1:
raise ValueError('Content length must be positive or -1.')
def _filter_new_content(self, content, db, cur):
"""Sort contents into buckets 'with data' and 'without data',
and filter out those already in the database."""
content_by_status = defaultdict(list)
for d in content:
content_by_status[d['status']].append(d)
content_with_data = content_by_status['visible'] \
+ content_by_status['hidden']
content_without_data = content_by_status['absent']
missing_content = set(self.content_missing(content_with_data,
db=db, cur=cur))
missing_skipped = set(self._content_unique_key(hashes, db)
for hashes in self.skipped_content_missing(
content_without_data, db=db, cur=cur))
content_with_data = [
cont for cont in content_with_data
if cont['sha1'] in missing_content]
content_without_data = [
cont for cont in content_without_data
if self._content_unique_key(cont, db) in missing_skipped]
summary = {
'content:add': len(missing_content),
'skipped_content:add': len(missing_skipped),
}
return (content_with_data, content_without_data, summary)
def _content_add_metadata(self, db, cur,
content_with_data, content_without_data):
"""Add content to the postgresql database but not the object storage.
"""
if content_with_data:
# create temporary table for metadata injection
db.mktemp('content', cur)
db.copy_to(content_with_data, 'tmp_content',
db.content_add_keys, cur)
# move metadata in place
try:
db.content_add_from_temp(cur)
except psycopg2.IntegrityError as e:
from . import HashCollision
if e.diag.sqlstate == '23505' and \
e.diag.table_name == 'content':
constraint_to_hash_name = {
'content_pkey': 'sha1',
'content_sha1_git_idx': 'sha1_git',
'content_sha256_idx': 'sha256',
}
colliding_hash_name = constraint_to_hash_name \
.get(e.diag.constraint_name)
raise HashCollision(colliding_hash_name) from None
else:
raise
if content_without_data:
content_without_data = \
[cont.copy() for cont in content_without_data]
origins = db.origin_get_by_url(
[cont.get('origin') for cont in content_without_data],
cur=cur)
for (cont, origin) in zip(content_without_data, origins):
origin = dict(zip(db.origin_cols, origin))
if 'origin' in cont:
cont['origin'] = origin['id']
db.mktemp('skipped_content', cur)
db.copy_to(content_without_data, 'tmp_skipped_content',
db.skipped_content_keys, cur)
# move metadata in place
db.skipped_content_add_from_temp(cur)
@db_transaction()
def content_add(self, content, db, cur):
"""Add content blobs to the storage
Note: in case of DB errors, objects might have already been added to
the object storage and will not be removed. Since addition to the
object storage is idempotent, that should not be a problem.
Args:
contents (iterable): iterable of dictionaries representing
individual pieces of content to add. Each dictionary has the
following keys:
- data (bytes): the actual content
- length (int): content length (default: -1)
- one key for each checksum algorithm in
:data:`swh.model.hashutil.ALGORITHMS`, mapped to the
corresponding checksum
- status (str): one of visible, hidden, absent
- reason (str): if status = absent, the reason why
- origin (int): if status = absent, the origin we saw the
content in
Raises:
In case of errors, nothing is stored in the db (in the
objstorage, it could though). The following exceptions can
occur:
- HashCollision in case of collision
- Any other exceptions raise by the db
Returns:
Summary dict with the following key and associated values:
content:add: New contents added
content:add:bytes: Sum of the contents' length data
skipped_content:add: New skipped contents (no data) added
"""
content = [dict(c.items()) for c in content] # semi-shallow copy
now = datetime.datetime.now(tz=datetime.timezone.utc)
for item in content:
item['ctime'] = now
content = [self._normalize_content(c) for c in content]
for c in content:
self._validate_content(c)
(content_with_data, content_without_data, summary) = \
self._filter_new_content(content, db, cur)
if self.journal_writer:
for item in content_with_data:
if 'data' in item:
item = item.copy()
del item['data']
self.journal_writer.write_addition('content', item)
for item in content_without_data:
self.journal_writer.write_addition('content', item)
def add_to_objstorage():
"""Add to objstorage the new missing_content
Returns:
Sum of all the content's data length pushed to the
objstorage. Content present twice is only sent once.
"""
content_bytes_added = 0
data = {}
for cont in content_with_data:
if cont['sha1'] not in data:
data[cont['sha1']] = cont['data']
content_bytes_added += max(0, cont['length'])
# FIXME: Since we do the filtering anyway now, we might as
# well make the objstorage's add_batch call return what we
# want here (real bytes added)... that'd simplify this...
self.objstorage.add_batch(data)
return content_bytes_added
with ThreadPoolExecutor(max_workers=1) as executor:
added_to_objstorage = executor.submit(add_to_objstorage)
self._content_add_metadata(
db, cur, content_with_data, content_without_data)
# Wait for objstorage addition before returning from the
# transaction, bubbling up any exception
content_bytes_added = added_to_objstorage.result()
summary['content:add:bytes'] = content_bytes_added
return summary
@db_transaction()
def content_update(self, content, keys=[], db=None, cur=None):
"""Update content blobs to the storage. Does nothing for unknown
contents or skipped ones.
Args:
content (iterable): iterable of dictionaries representing
individual pieces of content to update. Each dictionary has the
following keys:
- data (bytes): the actual content
- length (int): content length (default: -1)
- one key for each checksum algorithm in
:data:`swh.model.hashutil.ALGORITHMS`, mapped to the
corresponding checksum
- status (str): one of visible, hidden, absent
keys (list): List of keys (str) whose values needs an update, e.g.,
new hash column
"""
# TODO: Add a check on input keys. How to properly implement
# this? We don't know yet the new columns.
if self.journal_writer:
raise NotImplementedError(
'content_update is not yet support with a journal_writer.')
db.mktemp('content', cur)
select_keys = list(set(db.content_get_metadata_keys).union(set(keys)))
db.copy_to(content, 'tmp_content', select_keys, cur)
db.content_update_from_temp(keys_to_update=keys,
cur=cur)
@db_transaction()
def content_add_metadata(self, content, db, cur):
"""Add content metadata to the storage (like `content_add`, but
without inserting to the objstorage).
Args:
content (iterable): iterable of dictionaries representing
individual pieces of content to add. Each dictionary has the
following keys:
- length (int): content length (default: -1)
- one key for each checksum algorithm in
:data:`swh.model.hashutil.ALGORITHMS`, mapped to the
corresponding checksum
- status (str): one of visible, hidden, absent
- reason (str): if status = absent, the reason why
- origin (int): if status = absent, the origin we saw the
content in
- ctime (datetime): time of insertion in the archive
Returns:
Summary dict with the following key and associated values:
content:add: New contents added
skipped_content:add: New skipped contents (no data) added
"""
content = [self._normalize_content(c) for c in content]
for c in content:
self._validate_content(c)
(content_with_data, content_without_data, summary) = \
self._filter_new_content(content, db, cur)
if self.journal_writer:
for item in itertools.chain(content_with_data,
content_without_data):
assert 'data' not in content
self.journal_writer.write_addition('content', item)
self._content_add_metadata(
db, cur, content_with_data, content_without_data)
return summary
def content_get(self, content):
"""Retrieve in bulk contents and their data.
This generator yields exactly as many items than provided sha1
identifiers, but callers should not assume this will always be true.
It may also yield `None` values in case an object was not found.
Args:
content: iterables of sha1
Yields:
Dict[str, bytes]: Generates streams of contents as dict with their
raw data:
- sha1 (bytes): content id
- data (bytes): content's raw data
Raises:
ValueError in case of too much contents are required.
cf. BULK_BLOCK_CONTENT_LEN_MAX
"""
# FIXME: Make this method support slicing the `data`.
if len(content) > BULK_BLOCK_CONTENT_LEN_MAX:
raise ValueError(
"Send at maximum %s contents." % BULK_BLOCK_CONTENT_LEN_MAX)
for obj_id in content:
try:
data = self.objstorage.get(obj_id)
except ObjNotFoundError:
yield None
continue
yield {'sha1': obj_id, 'data': data}
@db_transaction()
def content_get_range(self, start, end, limit=1000, db=None, cur=None):
"""Retrieve contents within range [start, end] bound by limit.
Note that this function may return more than one blob per hash. The
limit is enforced with multiplicity (ie. two blobs with the same hash
will count twice toward the limit).
Args:
**start** (bytes): Starting identifier range (expected smaller
than end)
**end** (bytes): Ending identifier range (expected larger
than start)
**limit** (int): Limit result (default to 1000)
Returns:
a dict with keys:
- contents [dict]: iterable of contents in between the range.
- next (bytes): There remains content in the range
starting from this next sha1
"""
if limit is None:
raise ValueError('Development error: limit should not be None')
contents = []
next_content = None
for counter, content_row in enumerate(
db.content_get_range(start, end, limit+1, cur)):
content = dict(zip(db.content_get_metadata_keys, content_row))
if counter >= limit:
# take the last commit for the next page starting from this
next_content = content['sha1']
break
contents.append(content)
return {
'contents': contents,
'next': next_content,
}
@db_transaction_generator(statement_timeout=500)
def content_get_metadata(self, content, db=None, cur=None):
"""Retrieve content metadata in bulk
Args:
content: iterable of content identifiers (sha1)
Returns:
an iterable with content metadata corresponding to the given ids
"""
for metadata in db.content_get_metadata_from_sha1s(content, cur):
yield dict(zip(db.content_get_metadata_keys, metadata))
@db_transaction_generator()
def content_missing(self, content, key_hash='sha1', db=None, cur=None):
"""List content missing from storage
Args:
content ([dict]): iterable of dictionaries whose keys are
either 'length' or an item of
:data:`swh.model.hashutil.ALGORITHMS`;
mapped to the corresponding checksum
(or length).
key_hash (str): name of the column to use as hash id
result (default: 'sha1')
Returns:
iterable ([bytes]): missing content ids (as per the
key_hash column)
Raises:
TODO: an exception when we get a hash collision.
"""
keys = db.content_hash_keys
if key_hash not in keys:
raise ValueError("key_hash should be one of %s" % keys)
key_hash_idx = keys.index(key_hash)
if not content:
return
for obj in db.content_missing_from_list(content, cur):
yield obj[key_hash_idx]
@db_transaction_generator()
def content_missing_per_sha1(self, contents, db=None, cur=None):
"""List content missing from storage based only on sha1.
Args:
contents: Iterable of sha1 to check for absence.
Returns:
iterable: missing ids
Raises:
TODO: an exception when we get a hash collision.
"""
for obj in db.content_missing_per_sha1(contents, cur):
yield obj[0]
@db_transaction_generator()
def skipped_content_missing(self, contents, db=None, cur=None):
"""List skipped_content missing from storage
Args:
content: iterable of dictionaries containing the data for each
checksum algorithm.
Returns:
iterable: missing signatures
"""
for content in db.skipped_content_missing(contents, cur):
yield dict(zip(db.content_hash_keys, content))
@db_transaction()
def content_find(self, content, db=None, cur=None):
"""Find a content hash in db.
Args:
content: a dictionary representing one content hash, mapping
checksum algorithm names (see swh.model.hashutil.ALGORITHMS) to
checksum values
Returns:
a triplet (sha1, sha1_git, sha256) if the content exist
or None otherwise.
Raises:
ValueError: in case the key of the dictionary is not sha1, sha1_git
nor sha256.
"""
if not set(content).intersection(ALGORITHMS):
raise ValueError('content keys must contain at least one of: '
'sha1, sha1_git, sha256, blake2s256')
contents = db.content_find(sha1=content.get('sha1'),
sha1_git=content.get('sha1_git'),
sha256=content.get('sha256'),
blake2s256=content.get('blake2s256'),
cur=cur)
return [dict(zip(db.content_find_cols, content))
for content in contents]
@db_transaction()
def directory_add(self, directories, db, cur):
"""Add directories to the storage
Args:
directories (iterable): iterable of dictionaries representing the
individual directories to add. Each dict has the following
keys:
- id (sha1_git): the id of the directory to add
- entries (list): list of dicts for each entry in the
directory. Each dict has the following keys:
- name (bytes)
- type (one of 'file', 'dir', 'rev'): type of the
directory entry (file, directory, revision)
- target (sha1_git): id of the object pointed at by the
directory entry
- perms (int): entry permissions
Returns:
Summary dict of keys with associated count as values:
directory:add: Number of directories actually added
"""
summary = {'directory:add': 0}
dirs = set()
dir_entries = {
'file': defaultdict(list),
'dir': defaultdict(list),
'rev': defaultdict(list),
}
for cur_dir in directories:
dir_id = cur_dir['id']
dirs.add(dir_id)
for src_entry in cur_dir['entries']:
entry = src_entry.copy()
entry['dir_id'] = dir_id
if entry['type'] not in ('file', 'dir', 'rev'):
raise ValueError(
'Entry type must be file, dir, or rev; not %s'
% entry['type'])
dir_entries[entry['type']][dir_id].append(entry)
dirs_missing = set(self.directory_missing(dirs, db=db, cur=cur))
if not dirs_missing:
return summary
if self.journal_writer:
self.journal_writer.write_additions(
'directory',
(dir_ for dir_ in directories
if dir_['id'] in dirs_missing))
# Copy directory ids
dirs_missing_dict = ({'id': dir} for dir in dirs_missing)
db.mktemp('directory', cur)
db.copy_to(dirs_missing_dict, 'tmp_directory', ['id'], cur)
# Copy entries
for entry_type, entry_list in dir_entries.items():
entries = itertools.chain.from_iterable(
entries_for_dir
for dir_id, entries_for_dir
in entry_list.items()
if dir_id in dirs_missing)
db.mktemp_dir_entry(entry_type)
db.copy_to(
entries,
'tmp_directory_entry_%s' % entry_type,
['target', 'name', 'perms', 'dir_id'],
cur,
)
# Do the final copy
db.directory_add_from_temp(cur)
summary['directory:add'] = len(dirs_missing)
return summary
@db_transaction_generator()
def directory_missing(self, directories, db=None, cur=None):
"""List directories missing from storage
Args:
directories (iterable): an iterable of directory ids
Yields:
missing directory ids
"""
for obj in db.directory_missing_from_list(directories, cur):
yield obj[0]
@db_transaction_generator(statement_timeout=20000)
def directory_ls(self, directory, recursive=False, db=None, cur=None):
"""Get entries for one directory.
Args:
- directory: the directory to list entries from.
- recursive: if flag on, this list recursively from this directory.
Returns:
List of entries for such directory.
If `recursive=True`, names in the path of a dir/file not at the
root are concatenated with a slash (`/`).
"""
if recursive:
res_gen = db.directory_walk(directory, cur=cur)
else:
res_gen = db.directory_walk_one(directory, cur=cur)
for line in res_gen:
yield dict(zip(db.directory_ls_cols, line))
@db_transaction(statement_timeout=2000)
def directory_entry_get_by_path(self, directory, paths, db=None, cur=None):
"""Get the directory entry (either file or dir) from directory with path.
Args:
- directory: sha1 of the top level directory
- paths: path to lookup from the top level directory. From left
(top) to right (bottom).
Returns:
The corresponding directory entry if found, None otherwise.
"""
res = db.directory_entry_get_by_path(directory, paths, cur)
if res:
return dict(zip(db.directory_ls_cols, res))
@db_transaction()
def revision_add(self, revisions, db, cur):
"""Add revisions to the storage
Args:
revisions (Iterable[dict]): iterable of dictionaries representing
the individual revisions to add. Each dict has the following
keys:
- **id** (:class:`sha1_git`): id of the revision to add
- **date** (:class:`dict`): date the revision was written
- **committer_date** (:class:`dict`): date the revision got
added to the origin
- **type** (one of 'git', 'tar'): type of the
revision added
- **directory** (:class:`sha1_git`): the directory the
revision points at
- **message** (:class:`bytes`): the message associated with
the revision
- **author** (:class:`Dict[str, bytes]`): dictionary with
keys: name, fullname, email
- **committer** (:class:`Dict[str, bytes]`): dictionary with
keys: name, fullname, email
- **metadata** (:class:`jsonb`): extra information as
dictionary
- **synthetic** (:class:`bool`): revision's nature (tarball,
directory creates synthetic revision`)
- **parents** (:class:`list[sha1_git]`): the parents of
this revision
date dictionaries have the form defined in :mod:`swh.model`.
Returns:
Summary dict of keys with associated count as values
revision:add: New objects actually stored in db
"""
summary = {'revision:add': 0}
revisions_missing = set(self.revision_missing(
set(revision['id'] for revision in revisions),
db=db, cur=cur))
if not revisions_missing:
return summary
db.mktemp_revision(cur)
revisions_filtered = [
revision for revision in revisions
if revision['id'] in revisions_missing]
if self.journal_writer:
self.journal_writer.write_additions('revision', revisions_filtered)
revisions_filtered = map(converters.revision_to_db, revisions_filtered)
parents_filtered = []
db.copy_to(
revisions_filtered, 'tmp_revision', db.revision_add_cols,
cur,
lambda rev: parents_filtered.extend(rev['parents']))
db.revision_add_from_temp(cur)
db.copy_to(parents_filtered, 'revision_history',
['id', 'parent_id', 'parent_rank'], cur)
return {'revision:add': len(revisions_missing)}
@db_transaction_generator()
def revision_missing(self, revisions, db=None, cur=None):
"""List revisions missing from storage
Args:
revisions (iterable): revision ids
Yields:
missing revision ids
"""
if not revisions:
return
for obj in db.revision_missing_from_list(revisions, cur):
yield obj[0]
@db_transaction_generator(statement_timeout=1000)
def revision_get(self, revisions, db=None, cur=None):
"""Get all revisions from storage
Args:
revisions: an iterable of revision ids
Returns:
iterable: an iterable of revisions as dictionaries (or None if the
revision doesn't exist)
"""
for line in db.revision_get_from_list(revisions, cur):
data = converters.db_to_revision(
dict(zip(db.revision_get_cols, line))
)
if not data['type']:
yield None
continue
yield data
@db_transaction_generator(statement_timeout=2000)
def revision_log(self, revisions, limit=None, db=None, cur=None):
"""Fetch revision entry from the given root revisions.
Args:
revisions: array of root revision to lookup
limit: limitation on the output result. Default to None.
Yields:
List of revision log from such revisions root.
"""
for line in db.revision_log(revisions, limit, cur):
data = converters.db_to_revision(
dict(zip(db.revision_get_cols, line))
)
if not data['type']:
yield None
continue
yield data
@db_transaction_generator(statement_timeout=2000)
def revision_shortlog(self, revisions, limit=None, db=None, cur=None):
"""Fetch the shortlog for the given revisions
Args:
revisions: list of root revisions to lookup
limit: depth limitation for the output
Yields:
a list of (id, parents) tuples.
"""
yield from db.revision_shortlog(revisions, limit, cur)
@db_transaction()
def release_add(self, releases, db, cur):
"""Add releases to the storage
Args:
releases (Iterable[dict]): iterable of dictionaries representing
the individual releases to add. Each dict has the following
keys:
- **id** (:class:`sha1_git`): id of the release to add
- **revision** (:class:`sha1_git`): id of the revision the
release points to
- **date** (:class:`dict`): the date the release was made
- **name** (:class:`bytes`): the name of the release
- **comment** (:class:`bytes`): the comment associated with
the release
- **author** (:class:`Dict[str, bytes]`): dictionary with
keys: name, fullname, email
the date dictionary has the form defined in :mod:`swh.model`.
Returns:
Summary dict of keys with associated count as values
release:add: New objects contents actually stored in db
"""
summary = {'release:add': 0}
release_ids = set(release['id'] for release in releases)
releases_missing = set(self.release_missing(release_ids,
db=db, cur=cur))
if not releases_missing:
return summary
db.mktemp_release(cur)
releases_missing = list(releases_missing)
releases_filtered = [
release for release in releases
if release['id'] in releases_missing
]
if self.journal_writer:
self.journal_writer.write_additions('release', releases_filtered)
releases_filtered = map(converters.release_to_db, releases_filtered)
db.copy_to(releases_filtered, 'tmp_release', db.release_add_cols,
cur)
db.release_add_from_temp(cur)
return {'release:add': len(releases_missing)}
@db_transaction_generator()
def release_missing(self, releases, db=None, cur=None):
"""List releases missing from storage
Args:
releases: an iterable of release ids
Returns:
a list of missing release ids
"""
if not releases:
return
for obj in db.release_missing_from_list(releases, cur):
yield obj[0]
@db_transaction_generator(statement_timeout=500)
def release_get(self, releases, db=None, cur=None):
"""Given a list of sha1, return the releases's information
Args:
releases: list of sha1s
Yields:
dicts with the same keys as those given to `release_add`
(or ``None`` if a release does not exist)
"""
for release in db.release_get_from_list(releases, cur):
data = converters.db_to_release(
dict(zip(db.release_get_cols, release))
)
yield data if data['target_type'] else None
@db_transaction()
def snapshot_add(self, snapshots, db=None, cur=None):
"""Add snapshots to the storage.
Args:
snapshot ([dict]): the snapshots to add, containing the
following keys:
- **id** (:class:`bytes`): id of the snapshot
- **branches** (:class:`dict`): branches the snapshot contains,
mapping the branch name (:class:`bytes`) to the branch target,
itself a :class:`dict` (or ``None`` if the branch points to an
unknown object)
- **target_type** (:class:`str`): one of ``content``,
``directory``, ``revision``, ``release``,
``snapshot``, ``alias``
- **target** (:class:`bytes`): identifier of the target
(currently a ``sha1_git`` for all object kinds, or the name
of the target branch for aliases)
Raises:
ValueError: if the origin or visit id does not exist.
Returns:
Summary dict of keys with associated count as values
snapshot:add: Count of object actually stored in db
"""
created_temp_table = False
count = 0
for snapshot in snapshots:
if not db.snapshot_exists(snapshot['id'], cur):
if not created_temp_table:
db.mktemp_snapshot_branch(cur)
created_temp_table = True
db.copy_to(
(
{
'name': name,
'target': info['target'] if info else None,
'target_type': (info['target_type']
if info else None),
}
for name, info in snapshot['branches'].items()
),
'tmp_snapshot_branch',
['name', 'target', 'target_type'],
cur,
)
if self.journal_writer:
self.journal_writer.write_addition('snapshot', snapshot)
db.snapshot_add(snapshot['id'], cur)
count += 1
return {'snapshot:add': count}
@db_transaction(statement_timeout=2000)
def snapshot_get(self, snapshot_id, db=None, cur=None):
"""Get the content, possibly partial, of a snapshot with the given id
The branches of the snapshot are iterated in the lexicographical
order of their names.
.. warning:: At most 1000 branches contained in the snapshot will be
returned for performance reasons. In order to browse the whole
set of branches, the method :meth:`snapshot_get_branches`
should be used instead.
Args:
snapshot_id (bytes): identifier of the snapshot
Returns:
dict: a dict with three keys:
* **id**: identifier of the snapshot
* **branches**: a dict of branches contained in the snapshot
whose keys are the branches' names.
* **next_branch**: the name of the first branch not returned
or :const:`None` if the snapshot has less than 1000
branches.
"""
return self.snapshot_get_branches(snapshot_id, db=db, cur=cur)
@db_transaction(statement_timeout=2000)
def snapshot_get_by_origin_visit(self, origin, visit, db=None, cur=None):
"""Get the content, possibly partial, of a snapshot for the given origin visit
The branches of the snapshot are iterated in the lexicographical
order of their names.
.. warning:: At most 1000 branches contained in the snapshot will be
returned for performance reasons. In order to browse the whole
set of branches, the method :meth:`snapshot_get_branches`
should be used instead.
Args:
origin (int): the origin identifier
visit (int): the visit identifier
Returns:
dict: None if the snapshot does not exist;
a dict with three keys otherwise:
* **id**: identifier of the snapshot
* **branches**: a dict of branches contained in the snapshot
whose keys are the branches' names.
* **next_branch**: the name of the first branch not returned
or :const:`None` if the snapshot has less than 1000
branches.
"""
snapshot_id = db.snapshot_get_by_origin_visit(origin, visit, cur)
if snapshot_id:
return self.snapshot_get(snapshot_id, db=db, cur=cur)
return None
@db_transaction(statement_timeout=4000)
def snapshot_get_latest(self, origin, allowed_statuses=None, db=None,
cur=None):
"""Get the content, possibly partial, of the latest snapshot for the
given origin, optionally only from visits that have one of the given
allowed_statuses
The branches of the snapshot are iterated in the lexicographical
order of their names.
.. warning:: At most 1000 branches contained in the snapshot will be
returned for performance reasons. In order to browse the whole
set of branches, the method :meth:`snapshot_get_branches`
should be used instead.
Args:
origin (Union[str,int]): the origin's URL or identifier
allowed_statuses (list of str): list of visit statuses considered
to find the latest snapshot for the visit. For instance,
``allowed_statuses=['full']`` will only consider visits that
have successfully run to completion.
Returns:
dict: a dict with three keys:
* **id**: identifier of the snapshot
* **branches**: a dict of branches contained in the snapshot
whose keys are the branches' names.
* **next_branch**: the name of the first branch not returned
or :const:`None` if the snapshot has less than 1000
branches.
"""
if isinstance(origin, int):
origin = self.origin_get({'id': origin}, db=db, cur=cur)
if not origin:
return
origin = origin['url']
origin_visit = self.origin_visit_get_latest(
origin, allowed_statuses=allowed_statuses, require_snapshot=True,
db=db, cur=cur)
if origin_visit and origin_visit['snapshot']:
snapshot = self.snapshot_get(
origin_visit['snapshot'], db=db, cur=cur)
if not snapshot:
raise ValueError(
'last origin visit references an unknown snapshot')
return snapshot
@db_transaction(statement_timeout=2000)
def snapshot_count_branches(self, snapshot_id, db=None, cur=None):
"""Count the number of branches in the snapshot with the given id
Args:
snapshot_id (bytes): identifier of the snapshot
Returns:
dict: A dict whose keys are the target types of branches and
values their corresponding amount
"""
return dict([bc for bc in
db.snapshot_count_branches(snapshot_id, cur)])
@db_transaction(statement_timeout=2000)
def snapshot_get_branches(self, snapshot_id, branches_from=b'',
branches_count=1000, target_types=None,
db=None, cur=None):
"""Get the content, possibly partial, of a snapshot with the given id
The branches of the snapshot are iterated in the lexicographical
order of their names.
Args:
snapshot_id (bytes): identifier of the snapshot
branches_from (bytes): optional parameter used to skip branches
whose name is lesser than it before returning them
branches_count (int): optional parameter used to restrain
the amount of returned branches
target_types (list): optional parameter used to filter the
target types of branch to return (possible values that can be
contained in that list are `'content', 'directory',
'revision', 'release', 'snapshot', 'alias'`)
Returns:
dict: None if the snapshot does not exist;
a dict with three keys otherwise:
* **id**: identifier of the snapshot
* **branches**: a dict of branches contained in the snapshot
whose keys are the branches' names.
* **next_branch**: the name of the first branch not returned
or :const:`None` if the snapshot has less than
`branches_count` branches after `branches_from` included.
"""
if snapshot_id == EMPTY_SNAPSHOT_ID:
return {
'id': snapshot_id,
'branches': {},
'next_branch': None,
}
branches = {}
next_branch = None
fetched_branches = list(db.snapshot_get_by_id(
snapshot_id, branches_from=branches_from,
branches_count=branches_count+1, target_types=target_types,
cur=cur,
))
for branch in fetched_branches[:branches_count]:
branch = dict(zip(db.snapshot_get_cols, branch))
del branch['snapshot_id']
name = branch.pop('name')
if branch == {'target': None, 'target_type': None}:
branch = None
branches[name] = branch
if len(fetched_branches) > branches_count:
branch = dict(zip(db.snapshot_get_cols, fetched_branches[-1]))
next_branch = branch['name']
if branches:
return {
'id': snapshot_id,
'branches': branches,
'next_branch': next_branch,
}
return None
@db_transaction()
def origin_visit_add(self, origin, date, type,
db=None, cur=None):
"""Add an origin_visit for the origin at ts with status 'ongoing'.
Args:
origin (Union[int,str]): visited origin's identifier or URL
date (Union[str,datetime]): timestamp of such visit
type (str): the type of loader used for the visit (hg, git, ...)
Returns:
dict: dictionary with keys origin and visit where:
- origin: origin identifier
- visit: the visit identifier for the new visit occurrence
"""
if isinstance(origin, str):
origin = self.origin_get({'url': origin}, db=db, cur=cur)
origin_id = origin['id']
else:
origin = self.origin_get({'id': origin}, db=db, cur=cur)
origin_id = origin['id']
if isinstance(date, str):
# FIXME: Converge on iso8601 at some point
date = dateutil.parser.parse(date)
visit_id = db.origin_visit_add(origin_id, date, type, cur)
if self.journal_writer:
# We can write to the journal only after inserting to the
# DB, because we want the id of the visit
del origin['id']
self.journal_writer.write_addition('origin_visit', {
'origin': origin, 'date': date, 'type': type,
'visit': visit_id,
'status': 'ongoing', 'metadata': None, 'snapshot': None})
return {
'origin': origin_id,
'visit': visit_id,
}
@db_transaction()
def origin_visit_update(self, origin, visit_id, status=None,
metadata=None, snapshot=None,
db=None, cur=None):
"""Update an origin_visit's status.
Args:
origin (Union[int,str]): visited origin's identifier or URL
visit_id: Visit's id
status: Visit's new status
metadata: Data associated to the visit
snapshot (sha1_git): identifier of the snapshot to add to
the visit
Returns:
None
"""
if isinstance(origin, str):
origin_id = self.origin_get({'url': origin}, db=db, cur=cur)['id']
else:
origin_id = origin
visit = db.origin_visit_get(origin_id, visit_id, cur=cur)
if not visit:
raise ValueError('Invalid visit_id for this origin.')
visit = dict(zip(db.origin_visit_get_cols, visit))
updates = {}
if status and status != visit['status']:
updates['status'] = status
if metadata and metadata != visit['metadata']:
updates['metadata'] = metadata
if snapshot and snapshot != visit['snapshot']:
updates['snapshot'] = snapshot
if updates:
if self.journal_writer:
origin = self.origin_get(
[{'id': origin_id}], db=db, cur=cur)[0]
del origin['id']
self.journal_writer.write_update('origin_visit', {
**visit, **updates, 'origin': origin})
db.origin_visit_update(origin_id, visit_id, updates, cur)
@db_transaction()
def origin_visit_upsert(self, visits, db=None, cur=None):
"""Add a origin_visits with a specific id and with all its data.
If there is already an origin_visit with the same
`(origin_id, visit_id)`, overwrites it.
Args:
visits: iterable of dicts with keys:
origin: dict with keys either `id` or `url`
visit: origin visit id
date: timestamp of such visit
status: Visit's new status
metadata: Data associated to the visit
snapshot (sha1_git): identifier of the snapshot to add to
the visit
"""
visits = copy.deepcopy(visits)
for visit in visits:
if isinstance(visit['date'], str):
visit['date'] = dateutil.parser.parse(visit['date'])
visit['origin'] = \
self.origin_get([visit['origin']], db=db, cur=cur)[0]
if self.journal_writer:
for visit in visits:
visit = copy.deepcopy(visit)
if visit.get('type') is None:
visit['type'] = visit['origin']['type']
del visit['origin']['id']
self.journal_writer.write_addition('origin_visit', visit)
for visit in visits:
visit['origin'] = visit['origin']['id']
# TODO: upsert them all in a single query
db.origin_visit_upsert(**visit, cur=cur)
@db_transaction_generator(statement_timeout=500)
def origin_visit_get(self, origin, last_visit=None, limit=None, db=None,
cur=None):
"""Retrieve all the origin's visit's information.
Args:
origin (Union[int,str]): The occurrence's origin (identifier/URL).
last_visit: Starting point from which listing the next visits
Default to None
limit (int): Number of results to return from the last visit.
Default to None
Yields:
List of visits.
"""
if isinstance(origin, str):
origin = self.origin_get([{'url': origin}], db=db, cur=cur)[0]
if not origin:
return
origin = origin['id']
for line in db.origin_visit_get_all(
origin, last_visit=last_visit, limit=limit, cur=cur):
data = dict(zip(db.origin_visit_get_cols, line))
yield data
@db_transaction(statement_timeout=500)
def origin_visit_find_by_date(self, origin, visit_date, db=None, cur=None):
"""Retrieves the origin visit whose date is closest to the provided
timestamp.
In case of a tie, the visit with largest id is selected.
Args:
origin (str): The occurrence's origin (URL).
target (datetime): target timestamp
Returns:
A visit.
"""
origin = self.origin_get([{'url': origin}], db=db, cur=cur)[0]
if not origin:
return
origin = origin['id']
line = db.origin_visit_find_by_date(origin, visit_date, cur=cur)
if line:
return dict(zip(db.origin_visit_get_cols, line))
@db_transaction(statement_timeout=500)
def origin_visit_get_by(self, origin, visit, db=None, cur=None):
"""Retrieve origin visit's information.
Args:
origin: The occurrence's origin (identifier).
Returns:
The information on that particular (origin, visit) or None if
it does not exist
"""
if isinstance(origin, str):
origin = self.origin_get({'url': origin}, db=db, cur=cur)
if not origin:
return
origin = origin['id']
ori_visit = db.origin_visit_get(origin, visit, cur)
if not ori_visit:
return None
return dict(zip(db.origin_visit_get_cols, ori_visit))
@db_transaction(statement_timeout=4000)
def origin_visit_get_latest(
self, origin, allowed_statuses=None, require_snapshot=False,
db=None, cur=None):
"""Get the latest origin visit for the given origin, optionally
looking only for those with one of the given allowed_statuses
or for those with a known snapshot.
Args:
origin (str): the origin's URL
allowed_statuses (list of str): list of visit statuses considered
to find the latest visit. For instance,
``allowed_statuses=['full']`` will only consider visits that
have successfully run to completion.
require_snapshot (bool): If True, only a visit with a snapshot
will be returned.
Returns:
dict: a dict with the following keys:
origin: the URL of the origin
visit: origin visit id
type: type of loader used for the visit
date: timestamp of such visit
status: Visit's new status
metadata: Data associated to the visit
snapshot (Optional[sha1_git]): identifier of the snapshot
associated to the visit
"""
origin = self.origin_get({'url': origin}, db=db, cur=cur)
if not origin:
return
origin = origin['id']
origin_visit = db.origin_visit_get_latest(
origin, allowed_statuses=allowed_statuses,
require_snapshot=require_snapshot, cur=cur)
if origin_visit:
return dict(zip(db.origin_visit_get_cols, origin_visit))
@db_transaction(statement_timeout=2000)
def object_find_by_sha1_git(self, ids, db=None, cur=None):
"""Return the objects found with the given ids.
Args:
ids: a generator of sha1_gits
Returns:
dict: a mapping from id to the list of objects found. Each object
found is itself a dict with keys:
- sha1_git: the input id
- type: the type of object found
- id: the id of the object found
- object_id: the numeric id of the object found.
"""
ret = {id: [] for id in ids}
for retval in db.object_find_by_sha1_git(ids, cur=cur):
if retval[1]:
ret[retval[0]].append(dict(zip(db.object_find_by_sha1_git_cols,
retval)))
return ret
origin_keys = ['id', 'url']
@db_transaction(statement_timeout=500)
def origin_get(self, origins, db=None, cur=None):
"""Return origins, either all identified by their ids or all
identified by tuples (type, url).
If the url is given and the type is omitted, one of the origins with
that url is returned.
Args:
origin: a list of dictionaries representing the individual
origins to find.
These dicts have either the key url:
- url (bytes): the url the origin points to
or the id:
- id: the origin id
Returns:
dict: the origin dictionary with the keys:
- id: origin's id
- url: origin's url
Raises:
ValueError: if the url or the id don't exist.
"""
if isinstance(origins, dict):
# Old API
return_single = True
origins = [origins]
elif len(origins) == 0:
return []
else:
return_single = False
origin_ids = [origin.get('id') for origin in origins]
origin_urls = [origin.get('url') for origin in origins]
if any(origin_ids):
# Lookup per ID
if all(origin_ids):
results = db.origin_get_by_id(origin_ids, cur)
else:
raise ValueError(
'Either all origins or none at all should have an "id".')
elif any(origin_urls):
# Lookup per type + URL
if all(origin_urls):
results = db.origin_get_by_url(origin_urls, cur)
else:
raise ValueError(
'Either all origins or none at all should have '
'an "url" key.')
else: # unsupported lookup
raise ValueError('Origin must have either id or url.')
results = [dict(zip(self.origin_keys, result))
for result in results]
if return_single:
assert len(results) == 1
if results[0]['id'] is not None:
return results[0]
else:
return None
else:
return [None if res['id'] is None else res for res in results]
@db_transaction_generator()
def origin_get_range(self, origin_from=1, origin_count=100,
db=None, cur=None):
"""Retrieve ``origin_count`` origins whose ids are greater
or equal than ``origin_from``.
Origins are sorted by id before retrieving them.
Args:
origin_from (int): the minimum id of origins to retrieve
origin_count (int): the maximum number of origins to retrieve
Yields:
dicts containing origin information as returned
by :meth:`swh.storage.storage.Storage.origin_get`.
"""
for origin in db.origin_get_range(origin_from, origin_count, cur):
yield dict(zip(self.origin_keys, origin))
@db_transaction_generator()
def origin_search(self, url_pattern, offset=0, limit=50,
regexp=False, with_visit=False, db=None, cur=None):
"""Search for origins whose urls contain a provided string pattern
or match a provided regular expression.
The search is performed in a case insensitive way.
Args:
url_pattern (str): the string pattern to search for in origin urls
offset (int): number of found origins to skip before returning
results
limit (int): the maximum number of found origins to return
regexp (bool): if True, consider the provided pattern as a regular
expression and return origins whose urls match it
with_visit (bool): if True, filter out origins with no visit
Yields:
dicts containing origin information as returned
by :meth:`swh.storage.storage.Storage.origin_get`.
"""
for origin in db.origin_search(url_pattern, offset, limit,
regexp, with_visit, cur):
yield dict(zip(self.origin_keys, origin))
@db_transaction()
def origin_count(self, url_pattern, regexp=False,
with_visit=False, db=None, cur=None):
"""Count origins whose urls contain a provided string pattern
or match a provided regular expression.
The pattern search in origin urls is performed in a case insensitive
way.
Args:
url_pattern (str): the string pattern to search for in origin urls
regexp (bool): if True, consider the provided pattern as a regular
expression and return origins whose urls match it
with_visit (bool): if True, filter out origins with no visit
Returns:
int: The number of origins matching the search criterion.
"""
return db.origin_count(url_pattern, regexp, with_visit, cur)
@db_transaction()
def origin_add(self, origins, db=None, cur=None):
"""Add origins to the storage
Args:
origins: list of dictionaries representing the individual origins,
with the following keys:
- type: the origin type ('git', 'svn', 'deb', ...)
- url (bytes): the url the origin points to
Returns:
list: given origins as dict updated with their id
"""
origins = copy.deepcopy(origins)
for origin in origins:
origin['id'] = self.origin_add_one(origin, db=db, cur=cur)
return origins
@db_transaction()
def origin_add_one(self, origin, db=None, cur=None):
"""Add origin to the storage
Args:
origin: dictionary representing the individual origin to add. This
dict has the following keys:
- type (FIXME: enum TBD): the origin type ('git', 'wget', ...)
- url (bytes): the url the origin points to
Returns:
the id of the added origin, or of the identical one that already
exists.
"""
origin_id = list(db.origin_get_by_url(
[origin['url']], cur))[0][0]
if origin_id:
return origin_id
if self.journal_writer:
self.journal_writer.write_addition('origin', origin)
return db.origin_add(origin['url'], cur)
@db_transaction(statement_timeout=500)
def stat_counters(self, db=None, cur=None):
"""compute statistics about the number of tuples in various tables
Returns:
dict: a dictionary mapping textual labels (e.g., content) to
integer values (e.g., the number of tuples in table content)
"""
return {k: v for (k, v) in db.stat_counters()}
@db_transaction()
def refresh_stat_counters(self, db=None, cur=None):
"""Recomputes the statistics for `stat_counters`."""
keys = [
'content',
'directory',
'directory_entry_dir',
'directory_entry_file',
'directory_entry_rev',
'origin',
'origin_visit',
'person',
'release',
'revision',
'revision_history',
'skipped_content',
'snapshot']
for key in keys:
cur.execute('select * from swh_update_counter(%s)', (key,))
@db_transaction()
def origin_metadata_add(self, origin_id, ts, provider, tool, metadata,
db=None, cur=None):
""" Add an origin_metadata for the origin at ts with provenance and
metadata.
Args:
origin_id (int): the origin's id for which the metadata is added
ts (datetime): timestamp of the found metadata
provider (int): the provider of metadata (ex:'hal')
tool (int): tool used to extract metadata
metadata (jsonb): the metadata retrieved at the time and location
Returns:
id (int): the origin_metadata unique id
"""
if isinstance(origin_id, str):
origin = self.origin_get({'url': origin_id}, db=db, cur=cur)
if not origin:
return
origin_id = origin['id']
if isinstance(ts, str):
ts = dateutil.parser.parse(ts)
return db.origin_metadata_add(origin_id, ts, provider, tool,
metadata, cur)
@db_transaction_generator(statement_timeout=500)
def origin_metadata_get_by(self, origin_id, provider_type=None, db=None,
cur=None):
"""Retrieve list of all origin_metadata entries for the origin_id
Args:
origin_id (int): the unique origin identifier
provider_type (str): (optional) type of provider
Returns:
list of dicts: the origin_metadata dictionary with the keys:
- origin_id (int): origin's id
- discovery_date (datetime): timestamp of discovery
- tool_id (int): metadata's extracting tool
- metadata (jsonb)
- provider_id (int): metadata's provider
- provider_name (str)
- provider_type (str)
- provider_url (str)
"""
if isinstance(origin_id, str):
origin = self.origin_get({'url': origin_id}, db=db, cur=cur)
if not origin:
return
origin_id = origin['id']
for line in db.origin_metadata_get_by(origin_id, provider_type, cur):
yield dict(zip(db.origin_metadata_get_cols, line))
@db_transaction()
def tool_add(self, tools, db=None, cur=None):
"""Add new tools to the storage.
Args:
tools (iterable of :class:`dict`): Tool information to add to
storage. Each tool is a :class:`dict` with the following keys:
- name (:class:`str`): name of the tool
- version (:class:`str`): version of the tool
- configuration (:class:`dict`): configuration of the tool,
must be json-encodable
Returns:
:class:`dict`: All the tools inserted in storage
(including the internal ``id``). The order of the list is not
guaranteed to match the order of the initial list.
"""
db.mktemp_tool(cur)
db.copy_to(tools, 'tmp_tool',
['name', 'version', 'configuration'],
cur)
tools = db.tool_add_from_temp(cur)
return [dict(zip(db.tool_cols, line)) for line in tools]
@db_transaction(statement_timeout=500)
def tool_get(self, tool, db=None, cur=None):
"""Retrieve tool information.
Args:
tool (dict): Tool information we want to retrieve from storage.
The dicts have the same keys as those used in :func:`tool_add`.
Returns:
dict: The full tool information if it exists (``id`` included),
None otherwise.
"""
tool_conf = tool['configuration']
if isinstance(tool_conf, dict):
tool_conf = json.dumps(tool_conf)
idx = db.tool_get(tool['name'],
tool['version'],
tool_conf)
if not idx:
return None
return dict(zip(db.tool_cols, idx))
@db_transaction()
def metadata_provider_add(self, provider_name, provider_type, provider_url,
metadata, db=None, cur=None):
"""Add a metadata provider.
Args:
provider_name (str): Its name
provider_type (str): Its type (eg. `'deposit-client'`)
provider_url (str): Its URL
metadata: JSON-encodable object
Returns:
int: an identifier of the provider
"""
return db.metadata_provider_add(provider_name, provider_type,
provider_url, metadata, cur)
@db_transaction()
def metadata_provider_get(self, provider_id, db=None, cur=None):
"""Get a metadata provider
Args:
provider_id: Its identifier, as given by `metadata_provider_add`.
Returns:
dict: same as `metadata_provider_add`;
or None if it does not exist.
"""
result = db.metadata_provider_get(provider_id)
if not result:
return None
return dict(zip(db.metadata_provider_cols, result))
@db_transaction()
def metadata_provider_get_by(self, provider, db=None, cur=None):
"""Get a metadata provider
Args:
provider (dict): A dictionary with keys:
* provider_name: Its name
* provider_url: Its URL
Returns:
dict: same as `metadata_provider_add`;
or None if it does not exist.
"""
result = db.metadata_provider_get_by(provider['provider_name'],
provider['provider_url'])
if not result:
return None
return dict(zip(db.metadata_provider_cols, result))
def diff_directories(self, from_dir, to_dir, track_renaming=False):
"""Compute the list of file changes introduced between two arbitrary
directories (insertion / deletion / modification / renaming of files).
Args:
from_dir (bytes): identifier of the directory to compare from
to_dir (bytes): identifier of the directory to compare to
track_renaming (bool): whether or not to track files renaming
Returns:
A list of dict describing the introduced file changes
(see :func:`swh.storage.algos.diff.diff_directories`
for more details).
"""
return diff.diff_directories(self, from_dir, to_dir, track_renaming)
def diff_revisions(self, from_rev, to_rev, track_renaming=False):
"""Compute the list of file changes introduced between two arbitrary
revisions (insertion / deletion / modification / renaming of files).
Args:
from_rev (bytes): identifier of the revision to compare from
to_rev (bytes): identifier of the revision to compare to
track_renaming (bool): whether or not to track files renaming
Returns:
A list of dict describing the introduced file changes
(see :func:`swh.storage.algos.diff.diff_directories`
for more details).
"""
return diff.diff_revisions(self, from_rev, to_rev, track_renaming)
def diff_revision(self, revision, track_renaming=False):
"""Compute the list of file changes introduced by a specific revision
(insertion / deletion / modification / renaming of files) by comparing
it against its first parent.
Args:
revision (bytes): identifier of the revision from which to
compute the list of files changes
track_renaming (bool): whether or not to track files renaming
Returns:
A list of dict describing the introduced file changes
(see :func:`swh.storage.algos.diff.diff_directories`
for more details).
"""
return diff.diff_revision(self, revision, track_renaming)

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