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service.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 Affero General Public License version 3, or any later version
# See top-level LICENSE file for more information
from collections import defaultdict
from swh.core import hashutil
from swh.web.ui import converters, query, upload, backend
from swh.web.ui.exc import NotFoundExc
def hash_and_search(filepath):
"""Hash the filepath's content as sha1, then search in storage if
it exists.
Args:
Filepath of the file to hash and search.
Returns:
Tuple (hex sha1, found as True or false).
The found boolean, according to whether the sha1 of the file
is present or not.
"""
h = hashutil.hashfile(filepath)
c = backend.content_find('sha1', h['sha1'])
if c:
r = converters.from_content(c)
r['found'] = True
return r
else:
return {'sha1': hashutil.hash_to_hex(h['sha1']),
'found': False}
def upload_and_search(file):
"""Upload a file and compute its hash.
"""
tmpdir, filename, filepath = upload.save_in_upload_folder(file)
res = {'filename': filename}
try:
content = hash_and_search(filepath)
res.update(content)
return res
finally:
# clean up
if tmpdir:
upload.cleanup(tmpdir)
def lookup_hash(q):
"""Checks if the storage contains a given content checksum
Args: query string of the form <hash_algo:hash>
Returns: Dict with key found to True or False, according to
whether the checksum is present or not
"""
algo, hash = query.parse_hash(q)
found = backend.content_find(algo, hash)
return {'found': found,
'algo': algo}
def lookup_hash_origin(q):
"""Return information about the checksum contained in the query q.
Args: query string of the form <hash_algo:hash>
Returns:
origin as dictionary if found for the given content.
"""
algo, hash = query.parse_hash(q)
origin = backend.content_find_occurrence(algo, hash)
return converters.from_origin(origin)
def lookup_origin(origin_id):
"""Return information about the origin with id origin_id.
Args:
origin_id as string
Returns:
origin information as dict.
"""
return backend.origin_get(origin_id)
def lookup_person(person_id):
"""Return information about the person with id person_id.
Args:
person_id as string
Returns:
person information as dict.
"""
person = backend.person_get(person_id)
return converters.from_person(person)
def lookup_directory(sha1_git):
"""Return information about the directory with id sha1_git.
Args:
sha1_git as string
Returns:
directory information as dict.
"""
_, sha1_git_bin = query.parse_hash_with_algorithms_or_throws(
sha1_git,
['sha1'], # HACK: sha1_git really
'Only sha1_git is supported.')
dir = backend.directory_get(sha1_git_bin)
if not dir:
return None
directory_entries = backend.directory_ls(sha1_git_bin)
return map(converters.from_directory_entry, directory_entries)
def lookup_release(release_sha1_git):
"""Return information about the release with sha1 release_sha1_git.
Args:
release_sha1_git: The release's sha1 as hexadecimal
Returns:
Release information as dict.
Raises:
ValueError if the identifier provided is not of sha1 nature.
"""
_, sha1_git_bin = query.parse_hash_with_algorithms_or_throws(
release_sha1_git,
['sha1'],
'Only sha1_git is supported.')
res = backend.release_get(sha1_git_bin)
return converters.from_release(res)
def lookup_revision(rev_sha1_git):
"""Return information about the revision with sha1 revision_sha1_git.
Args:
revision_sha1_git: The revision's sha1 as hexadecimal
Returns:
Revision information as dict.
Raises:
ValueError if the identifier provided is not of sha1 nature.
"""
_, sha1_git_bin = query.parse_hash_with_algorithms_or_throws(
rev_sha1_git,
['sha1'],
'Only sha1_git is supported.')
res = backend.revision_get(sha1_git_bin)
return converters.from_revision(res)
def lookup_revision_by(origin_id,
branch_name="refs/heads/master",
timestamp=None):
"""Lookup revisions by origin_id, branch_name and timestamp.
If:
- branch_name is not provided, lookup using 'refs/heads/master' as default.
- ts is not provided, use the most recent
Args:
- origin_id: origin of the revision.
- branch_name: revision's branch.
- timestamp: revision's time frame.
Yields:
The revisions matching the criterions.
"""
res = backend.revision_get_by(origin_id, branch_name, timestamp)
return converters.from_revision(res)
def lookup_revision_log(rev_sha1_git, limit=100):
"""Return information about the revision with sha1 revision_sha1_git.
Args:
revision_sha1_git: The revision's sha1 as hexadecimal
limit: the maximum number of revisions returned
Returns:
Revision information as dict.
Raises:
ValueError if the identifier provided is not of sha1 nature.
"""
_, sha1_git_bin = query.parse_hash_with_algorithms_or_throws(
rev_sha1_git,
['sha1'],
'Only sha1_git is supported.')
revision_entries = backend.revision_log(sha1_git_bin, limit)
return map(converters.from_revision, revision_entries)
def lookup_revision_with_context_by(origin_id, branch_name, ts, sha1_git,
limit=100):
"""Return information about revision sha1_git, limited to the
sub-graph of all transitive parents of sha1_git_root.
sha1_git_root being resolved through the lookup of a revision by origin_id,
branch_name and ts.
In other words, sha1_git is an ancestor of sha1_git_root.
Args:
- origin_id: origin of the revision.
- branch_name: revision's branch.
- timestamp: revision's time frame.
- sha1_git: one of sha1_git_root's ancestors.
- limit: limit the lookup to 100 revisions back.
Returns:
Pair of (root_revision, revision).
Information on sha1_git if it is an ancestor of sha1_git_root
including children leading to sha1_git_root
Raises:
- BadInputExc in case of unknown algo_hash or bad hash.
- NotFoundExc if either revision is not found or if sha1_git is not an
ancestor of sha1_git_root.
"""
rev_root = backend.revision_get_by(origin_id, branch_name, ts)
if not rev_root:
raise NotFoundExc('Revision with (origin_id: %s, branch_name: %s'
', ts: %s) not found.' % (origin_id,
branch_name,
ts))
return (converters.from_revision(rev_root),
lookup_revision_with_context(rev_root, sha1_git, limit))
def lookup_revision_with_context(sha1_git_root, sha1_git, limit=100):
"""Return information about revision sha1_git, limited to the
sub-graph of all transitive parents of sha1_git_root.
In other words, sha1_git is an ancestor of sha1_git_root.
Args:
sha1_git_root: latest revision. The type is either a sha1 (as an hex
string) or a non converted dict.
sha1_git: one of sha1_git_root's ancestors
limit: limit the lookup to 100 revisions back
Returns:
Information on sha1_git if it is an ancestor of sha1_git_root
including children leading to sha1_git_root
Raises:
BadInputExc in case of unknown algo_hash or bad hash
NotFoundExc if either revision is not found or if sha1_git is not an
ancestor of sha1_git_root
"""
_, sha1_git_bin = query.parse_hash_with_algorithms_or_throws(
sha1_git,
['sha1'],
'Only sha1_git is supported.')
revision = backend.revision_get(sha1_git_bin)
if not revision:
raise NotFoundExc('Revision %s not found' % sha1_git)
if isinstance(sha1_git_root, str):
_, sha1_git_root_bin = query.parse_hash_with_algorithms_or_throws(
sha1_git_root,
['sha1'],
'Only sha1_git is supported.')
revision_root = backend.revision_get(sha1_git_root_bin)
if not revision_root:
raise NotFoundExc('Revision root %s not found' % sha1_git_root)
else:
sha1_git_root_bin = sha1_git_root['id']
revision_log = backend.revision_log(sha1_git_root_bin, limit)
parents = {}
children = defaultdict(list)
for rev in revision_log:
rev_id = rev['id']
parents[rev_id] = []
for parent_id in rev['parents']:
parents[rev_id].append(parent_id)
children[parent_id].append(rev_id)
if revision['id'] not in parents:
raise NotFoundExc('Revision %s is not an ancestor of %s' %
(sha1_git, sha1_git_root))
revision['children'] = children[revision['id']]
return converters.from_revision(revision)
def lookup_directory_with_revision(sha1_git, dir_path=None):
"""Return information on directory pointed by revision with sha1_git.
If dir_path is not provided, display top level directory.
Otherwise, display the directory pointed by dir_path (if it exists).
Args:
sha1_git: revision's hash.
dir_path: optional directory pointed to by that revision.
Returns:
Information on the directory pointed to by that revision.
Raises:
BadInputExc in case of unknown algo_hash or bad hash.
NotFoundExc either if the revision is not found or the path referenced
does not exist.
NotImplementedError in case of dir_path exists but do not reference a
type 'dir' or 'file'.
"""
_, sha1_git_bin = query.parse_hash_with_algorithms_or_throws(
sha1_git,
['sha1'],
'Only sha1_git is supported.')
revision = backend.revision_get(sha1_git_bin)
if not revision:
raise NotFoundExc('Revision %s not found' % sha1_git)
dir_sha1_git_bin = revision['directory']
if dir_path:
entity = backend.directory_entry_get_by_path(dir_sha1_git_bin,
dir_path)
if not entity:
raise NotFoundExc(
"Directory or File '%s' pointed to by revision %s not found"
% (dir_path, sha1_git))
else:
entity = {'type': 'dir', 'target': dir_sha1_git_bin}
if entity['type'] == 'dir':
directory_entries = backend.directory_ls(entity['target'])
return {'type': 'dir',
'content': map(converters.from_directory_entry,
directory_entries)}
elif entity['type'] == 'file': # content
content = backend.content_find('sha1_git', entity['target'])
return {'type': 'file',
'content': converters.from_content(content)}
else:
raise NotImplementedError('Entity of type %s not implemented.'
% entity['type'])
def lookup_revision_through(revision, limit=100):
"""Retrieve a revision from the criterion stored in revision dictionary.
Args:
revision: Dictionary of criterion to lookup the revision with.
Here are the supported combination of possible values:
- origin_id, branch_name, ts, sha1_git
- origin_id, branch_name, ts
- sha1_git_root, sha1_git
- sha1_git
Returns:
None if the revision is not found or the actual revision.
"""
rev = None
if 'origin_id' in revision and \
'branch_name' in revision and \
'ts' in revision and \
'sha1_git' in revision:
rev = lookup_revision_with_context_by(revision['origin_id'],
revision['branch_name'],
revision['ts'],
revision['sha1_git'],
limit)
elif 'origin_id' in revision and \
'branch_name' in revision and \
'ts' in revision:
rev = lookup_revision_by(revision['origin_id'],
revision['branch_name'],
revision['ts'])
elif 'sha1_git_root' in revision and \
'sha1_git' in revision:
rev = lookup_revision_with_context(revision['sha1_git_root'],
revision['sha1_git'],
limit)
elif 'sha1_git' in revision:
rev = lookup_revision(revision['sha1_git'])
else:
# this should not happen
raise NotImplementedError('Should not happen!')
return rev
def lookup_directory_through_revision(revision, path=None, limit=100):
"""Retrieve the directory information from the revision.
"""
rev = lookup_revision_through(revision, limit)
if rev:
return rev['id'], lookup_directory_with_revision(rev['id'], path)
else:
return None, None
def lookup_content(q):
"""Lookup the content designed by q.
Args:
q: The release's sha1 as hexadecimal
"""
algo, hash = query.parse_hash(q)
c = backend.content_find(algo, hash)
return converters.from_content(c)
def lookup_content_raw(q):
"""Lookup the content designed by q.
Args:
q: query string of the form <hash_algo:hash>
Returns:
dict with 'sha1' and 'data' keys.
data representing its raw data decoded.
"""
algo, hash = query.parse_hash(q)
c = backend.content_find(algo, hash)
if not c:
return None
content = backend.content_get(c['sha1'])
return converters.from_content(content)
def stat_counters():
"""Return the stat counters for Software Heritage
Returns:
A dict mapping textual labels to integer values.
"""
return backend.stat_counters()
def lookup_entity_by_uuid(uuid):
"""Return the entity's hierarchy from its uuid.
Args:
uuid: entity's identifier.
Returns:
List of hierarchy entities from the entity with uuid.
"""
uuid = query.parse_uuid4(uuid)
return backend.entity_get(uuid)

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