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converters.py
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converters.py
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# Copyright (C) 2015 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
import datetime
import numbers
from swh.core.utils import decode_with_escape, encode_with_unescape
DEFAULT_AUTHOR = {
'fullname': None,
'name': None,
'email': None,
}
DEFAULT_DATE = {
'timestamp': None,
'offset': 0,
'neg_utc_offset': None,
}
def author_to_db(author):
"""Convert a swh-model author to its DB representation.
Args: a swh-model compatible author
Returns:
a dict containing three keys: author, fullname and email
"""
if author is None:
return DEFAULT_AUTHOR
return author
def db_to_author(id, fullname, name, email):
"""Convert the DB representation of an author to a swh-model author.
Args:
id (long): the author's identifier
fullname (bytes): the author's fullname
name (bytes): the author's name
email (bytes): the author's email
Returns:
a dict with four keys: id, fullname, name and email, or None if the id
is None
"""
if id is None:
return None
return {
'id': id,
'fullname': fullname,
'name': name,
'email': email,
}
def git_headers_to_db(git_headers):
"""Convert git headers to their database representation.
We convert the bytes to unicode by decoding them into utf-8 and replacing
invalid utf-8 sequences with backslash escapes.
"""
ret = []
for key, values in git_headers:
if isinstance(values, list):
ret.append([key, [decode_with_escape(value) for value in values]])
else:
ret.append([key, decode_with_escape(values)])
return ret
def db_to_git_headers(db_git_headers):
ret = []
for key, values in db_git_headers:
if isinstance(values, list):
ret.append([key, [encode_with_unescape(value)
for value in values]])
else:
ret.append([key, encode_with_unescape(values)])
return ret
def db_to_date(date, offset, neg_utc_offset):
"""Convert the DB representation of a date to a swh-model compatible date.
Args:
date (datetime.datetime): a date pulled out of the database
offset (int): an integer number of minutes representing an UTC offset
neg_utc_offset (boolean): whether an utc offset is negative
Returns:
a dict with three keys:
timestamp: a timestamp from UTC
offset: the number of minutes since UTC
negative_utc: whether a null UTC offset is negative
"""
if date is None:
return None
return {
'timestamp': date.timestamp(),
'offset': offset,
'negative_utc': neg_utc_offset,
}
def date_to_db(date_offset):
"""Convert a swh-model date_offset to its DB representation.
Args: a swh-model compatible date_offset
Returns:
a dict with three keys:
timestamp: a date in ISO format
offset: the UTC offset in minutes
neg_utc_offset: a boolean indicating whether a null offset is
negative or positive.
"""
if date_offset is None:
return DEFAULT_DATE
if isinstance(date_offset, numbers.Real):
date_offset = datetime.datetime.fromtimestamp(date_offset,
tz=datetime.timezone.utc)
if isinstance(date_offset, datetime.datetime):
timestamp = date_offset
utcoffset = date_offset.utcoffset()
offset = int(utcoffset.total_seconds()) // 60
neg_utc_offset = False if offset == 0 else None
else:
if isinstance(date_offset['timestamp'], numbers.Real):
timestamp = datetime.datetime.fromtimestamp(
date_offset['timestamp'], tz=datetime.timezone.utc)
else:
timestamp = date_offset['timestamp']
offset = date_offset['offset']
neg_utc_offset = date_offset.get('negative_utc', None)
return {
'timestamp': timestamp.isoformat(),
'offset': offset,
'neg_utc_offset': neg_utc_offset,
}
def revision_to_db(revision):
"""Convert a swh-model revision to its database representation.
"""
author = author_to_db(revision['author'])
date = date_to_db(revision['date'])
committer = author_to_db(revision['committer'])
committer_date = date_to_db(revision['committer_date'])
metadata = revision['metadata']
if metadata and 'extra_headers' in metadata:
metadata = metadata.copy()
extra_headers = git_headers_to_db(metadata['extra_headers'])
metadata['extra_headers'] = extra_headers
return {
'id': revision['id'],
'author_fullname': author['fullname'],
'author_name': author['name'],
'author_email': author['email'],
'date': date['timestamp'],
'date_offset': date['offset'],
'date_neg_utc_offset': date['neg_utc_offset'],
'committer_fullname': committer['fullname'],
'committer_name': committer['name'],
'committer_email': committer['email'],
'committer_date': committer_date['timestamp'],
'committer_date_offset': committer_date['offset'],
'committer_date_neg_utc_offset': committer_date['neg_utc_offset'],
'type': revision['type'],
'directory': revision['directory'],
'message': revision['message'],
'metadata': metadata,
'synthetic': revision['synthetic'],
'parents': [
{
'id': revision['id'],
'parent_id': parent,
'parent_rank': i,
} for i, parent in enumerate(revision['parents'])
],
}
def db_to_revision(db_revision):
"""Convert a database representation of a revision to its swh-model
representation."""
author = db_to_author(
db_revision['author_id'],
db_revision['author_fullname'],
db_revision['author_name'],
db_revision['author_email'],
)
date = db_to_date(
db_revision['date'],
db_revision['date_offset'],
db_revision['date_neg_utc_offset'],
)
committer = db_to_author(
db_revision['committer_id'],
db_revision['committer_fullname'],
db_revision['committer_name'],
db_revision['committer_email'],
)
committer_date = db_to_date(
db_revision['committer_date'],
db_revision['committer_date_offset'],
db_revision['committer_date_neg_utc_offset']
)
metadata = db_revision['metadata']
if metadata and 'extra_headers' in metadata:
extra_headers = db_to_git_headers(metadata['extra_headers'])
metadata['extra_headers'] = extra_headers
parents = []
if 'parents' in db_revision:
for parent in db_revision['parents']:
if parent:
parents.append(parent)
return {
'id': db_revision['id'],
'author': author,
'date': date,
'committer': committer,
'committer_date': committer_date,
'type': db_revision['type'],
'directory': db_revision['directory'],
'message': db_revision['message'],
'metadata': metadata,
'synthetic': db_revision['synthetic'],
'parents': parents,
}
def release_to_db(release):
"""Convert a swh-model release to its database representation.
"""
author = author_to_db(release['author'])
date = date_to_db(release['date'])
return {
'id': release['id'],
'author_fullname': author['fullname'],
'author_name': author['name'],
'author_email': author['email'],
'date': date['timestamp'],
'date_offset': date['offset'],
'date_neg_utc_offset': date['neg_utc_offset'],
'name': release['name'],
'target': release['target'],
'target_type': release['target_type'],
'comment': release['message'],
'synthetic': release['synthetic'],
}
def db_to_release(db_release):
"""Convert a database representation of a release to its swh-model
representation.
"""
author = db_to_author(
db_release['author_id'],
db_release['author_fullname'],
db_release['author_name'],
db_release['author_email'],
)
date = db_to_date(
db_release['date'],
db_release['date_offset'],
db_release['date_neg_utc_offset']
)
return {
'author': author,
'date': date,
'id': db_release['id'],
'name': db_release['name'],
'message': db_release['comment'],
'synthetic': db_release['synthetic'],
'target': db_release['target'],
'target_type': db_release['target_type'],
}

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