# 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
import select
from swh.core.db import BaseDb
from swh.core.db.db_utils import stored_procedure, jsonize
from swh.core.db.db_utils import execute_values_generator
class Db(BaseDb):
"""Proxy to the SWH DB, with wrappers around stored procedures
"""
def mktemp_dir_entry(self, entry_type, cur=None):
self._cursor(cur).execute('SELECT swh_mktemp_dir_entry(%s)',
(('directory_entry_%s' % entry_type),))
@stored_procedure('swh_mktemp_revision')
def mktemp_revision(self, cur=None): pass
@stored_procedure('swh_mktemp_release')
def mktemp_release(self, cur=None): pass
@stored_procedure('swh_mktemp_snapshot_branch')
def mktemp_snapshot_branch(self, cur=None): pass
def register_listener(self, notify_queue, cur=None):
"""Register a listener for NOTIFY queue `notify_queue`"""
self._cursor(cur).execute("LISTEN %s" % notify_queue)
def listen_notifies(self, timeout):
"""Listen to notifications for `timeout` seconds"""
if select.select([self.conn], [], [], timeout) == ([], [], []):
return
else:
self.conn.poll()
while self.conn.notifies:
yield self.conn.notifies.pop(0)
@stored_procedure('swh_content_add')
def content_add_from_temp(self, cur=None): pass
@stored_procedure('swh_directory_add')
def directory_add_from_temp(self, cur=None): pass
@stored_procedure('swh_skipped_content_add')
def skipped_content_add_from_temp(self, cur=None): pass
@stored_procedure('swh_revision_add')
def revision_add_from_temp(self, cur=None): pass
@stored_procedure('swh_release_add')
def release_add_from_temp(self, cur=None): pass
def content_update_from_temp(self, keys_to_update, cur=None):
cur = self._cursor(cur)
cur.execute("""select swh_content_update(ARRAY[%s] :: text[])""" %
keys_to_update)
content_get_metadata_keys = [
'sha1', 'sha1_git', 'sha256', 'blake2s256', 'length', 'status']
skipped_content_keys = [
'sha1', 'sha1_git', 'sha256', 'blake2s256',
'length', 'reason', 'status', 'origin']
def content_get_metadata_from_sha1s(self, sha1s, cur=None):
cur = self._cursor(cur)
yield from execute_values_generator(
cur, """
select t.sha1, %s from (values %%s) as t (sha1)
left join content using (sha1)
""" % ', '.join(self.content_get_metadata_keys[1:]),
((sha1,) for sha1 in sha1s),
)
def content_get_range(self, start, end, limit=None, cur=None):
"""Retrieve contents within range [start, end].
"""
cur = self._cursor(cur)
query = """select %s from content
where %%s <= sha1 and sha1 <= %%s
order by sha1
limit %%s""" % ', '.join(self.content_get_metadata_keys)
cur.execute(query, (start, end, limit))
yield from cur
content_hash_keys = ['sha1', 'sha1_git', 'sha256', 'blake2s256']
def content_missing_from_list(self, contents, cur=None):
cur = self._cursor(cur)
keys = ', '.join(self.content_hash_keys)
equality = ' AND '.join(
('t.%s = c.%s' % (key, key))
for key in self.content_hash_keys
)
yield from execute_values_generator(
cur, """
SELECT %s
FROM (VALUES %%s) as t(%s)
WHERE NOT EXISTS (
SELECT 1 FROM content c
WHERE %s
)
""" % (keys, keys, equality),
(tuple(c[key] for key in self.content_hash_keys) for c in contents)
)
def content_missing_per_sha1(self, sha1s, cur=None):
cur = self._cursor(cur)
yield from execute_values_generator(cur, """
SELECT t.sha1 FROM (VALUES %s) AS t(sha1)
WHERE NOT EXISTS (
SELECT 1 FROM content c WHERE c.sha1 = t.sha1
)""", ((sha1,) for sha1 in sha1s))
def skipped_content_missing_from_temp(self, cur=None):
cur = self._cursor(cur)
cur.execute("""SELECT sha1, sha1_git, sha256, blake2s256
FROM swh_skipped_content_missing()""")
yield from cur
def snapshot_exists(self, snapshot_id, cur=None):
"""Check whether a snapshot with the given id exists"""
cur = self._cursor(cur)
cur.execute("""SELECT 1 FROM snapshot where id=%s""", (snapshot_id,))
return bool(cur.fetchone())
def snapshot_add(self, origin, visit, snapshot_id, cur=None):
"""Add a snapshot for origin/visit from the temporary table"""
cur = self._cursor(cur)
cur.execute("""SELECT swh_snapshot_add(%s, %s, %s)""",
(origin, visit, snapshot_id))
snapshot_count_cols = ['target_type', 'count']
def snapshot_count_branches(self, snapshot_id, cur=None):
cur = self._cursor(cur)
query = """\
SELECT %s FROM swh_snapshot_count_branches(%%s)
""" % ', '.join(self.snapshot_count_cols)
cur.execute(query, (snapshot_id,))
yield from cur
snapshot_get_cols = ['snapshot_id', 'name', 'target', 'target_type']
def snapshot_get_by_id(self, snapshot_id, branches_from=b'',
branches_count=None, target_types=None,
cur=None):
cur = self._cursor(cur)
query = """\
SELECT %s
FROM swh_snapshot_get_by_id(%%s, %%s, %%s, %%s :: snapshot_target[])
""" % ', '.join(self.snapshot_get_cols)
cur.execute(query, (snapshot_id, branches_from, branches_count,
target_types))
yield from cur
def snapshot_get_by_origin_visit(self, origin_id, visit_id, cur=None):
cur = self._cursor(cur)
query = """\
SELECT swh_snapshot_get_by_origin_visit(%s, %s)
"""
cur.execute(query, (origin_id, visit_id))
ret = cur.fetchone()
if ret:
return ret[0]
content_find_cols = ['sha1', 'sha1_git', 'sha256', 'blake2s256', 'length',
'ctime', 'status']
def content_find(self, sha1=None, sha1_git=None, sha256=None,
blake2s256=None, cur=None):
"""Find the content optionally on a combination of the following
checksums sha1, sha1_git, sha256 or blake2s256.
Args:
sha1: sha1 content
git_sha1: the sha1 computed `a la git` sha1 of the content
sha256: sha256 content
blake2s256: blake2s256 content
Returns:
The tuple (sha1, sha1_git, sha256, blake2s256) if found or None.
"""
cur = self._cursor(cur)
cur.execute("""SELECT %s
FROM swh_content_find(%%s, %%s, %%s, %%s)
LIMIT 1""" % ','.join(self.content_find_cols),
(sha1, sha1_git, sha256, blake2s256))
content = cur.fetchone()
if set(content) == {None}:
return None
else:
return content
def directory_missing_from_list(self, directories, cur=None):
cur = self._cursor(cur)
yield from execute_values_generator(
cur, """
SELECT id FROM (VALUES %s) as t(id)
WHERE NOT EXISTS (
SELECT 1 FROM directory d WHERE d.id = t.id
)
""", ((id,) for id in directories))
directory_ls_cols = ['dir_id', 'type', 'target', 'name', 'perms',
'status', 'sha1', 'sha1_git', 'sha256', 'length']
def directory_walk_one(self, directory, cur=None):
cur = self._cursor(cur)
cols = ', '.join(self.directory_ls_cols)
query = 'SELECT %s FROM swh_directory_walk_one(%%s)' % cols
cur.execute(query, (directory,))
yield from cur
def directory_walk(self, directory, cur=None):
cur = self._cursor(cur)
cols = ', '.join(self.directory_ls_cols)
query = 'SELECT %s FROM swh_directory_walk(%%s)' % cols
cur.execute(query, (directory,))
yield from cur
def directory_entry_get_by_path(self, directory, paths, cur=None):
"""Retrieve a directory entry by path.
"""
cur = self._cursor(cur)
cols = ', '.join(self.directory_ls_cols)
query = (
'SELECT %s FROM swh_find_directory_entry_by_path(%%s, %%s)' % cols)
cur.execute(query, (directory, paths))
data = cur.fetchone()
if set(data) == {None}:
return None
return data
def revision_missing_from_list(self, revisions, cur=None):
cur = self._cursor(cur)
yield from execute_values_generator(
cur, """
SELECT id FROM (VALUES %s) as t(id)
WHERE NOT EXISTS (
SELECT 1 FROM revision r WHERE r.id = t.id
)
""", ((id,) for id in revisions))
revision_add_cols = [
'id', 'date', 'date_offset', 'date_neg_utc_offset', 'committer_date',
'committer_date_offset', 'committer_date_neg_utc_offset', 'type',
'directory', 'message', 'author_fullname', 'author_name',
'author_email', 'committer_fullname', 'committer_name',
'committer_email', 'metadata', 'synthetic',
]
revision_get_cols = revision_add_cols + [
'author_id', 'committer_id', 'parents']
def origin_visit_add(self, origin, ts, cur=None):
"""Add a new origin_visit for origin origin at timestamp ts with
status 'ongoing'.
Args:
origin: origin concerned by the visit
ts: the date of the visit
Returns:
The new visit index step for that origin
"""
cur = self._cursor(cur)
self._cursor(cur).execute('SELECT swh_origin_visit_add(%s, %s)',
(origin, ts))
return cur.fetchone()[0]
def origin_visit_update(self, origin, visit_id, status,
metadata, cur=None):
"""Update origin_visit's status."""
cur = self._cursor(cur)
update = """UPDATE origin_visit
SET status=%s, metadata=%s
WHERE origin=%s AND visit=%s"""
cur.execute(update, (status, jsonize(metadata), origin, visit_id))
origin_visit_get_cols = ['origin', 'visit', 'date', 'status', 'metadata',
'snapshot']
def origin_visit_get_all(self, origin_id,
last_visit=None, limit=None, cur=None):
"""Retrieve all visits for origin with id origin_id.
Args:
origin_id: The occurrence's origin
Yields:
The occurrence's history visits
"""
cur = self._cursor(cur)
if last_visit:
extra_condition = 'and visit > %s'
args = (origin_id, last_visit, limit)
else:
extra_condition = ''
args = (origin_id, limit)
query = """\
SELECT %s,
(select id from snapshot where object_id = snapshot_id) as snapshot
FROM origin_visit
WHERE origin=%%s %s
order by visit asc
limit %%s""" % (
', '.join(self.origin_visit_get_cols[:-1]), extra_condition
)
cur.execute(query, args)
yield from cur
def origin_visit_get(self, origin_id, visit_id, cur=None):
"""Retrieve information on visit visit_id of origin origin_id.
Args:
origin_id: the origin concerned
visit_id: The visit step for that origin
Returns:
The origin_visit information
"""
cur = self._cursor(cur)
query = """\
SELECT %s,
(select id from snapshot where object_id = snapshot_id)
as snapshot
FROM origin_visit
WHERE origin = %%s AND visit = %%s
""" % (', '.join(self.origin_visit_get_cols[:-1]))
cur.execute(query, (origin_id, visit_id))
r = cur.fetchall()
if not r:
return None
return r[0]
def origin_visit_exists(self, origin_id, visit_id, cur=None):
"""Check whether an origin visit with the given ids exists"""
cur = self._cursor(cur)
query = "SELECT 1 FROM origin_visit where origin = %s AND visit = %s"
cur.execute(query, (origin_id, visit_id))
return bool(cur.fetchone())
def origin_visit_get_latest_snapshot(self, origin_id,
allowed_statuses=None,
cur=None):
"""Retrieve the most recent origin_visit which references a snapshot
Args:
origin_id: the origin concerned
allowed_statuses: the visit statuses allowed for the returned visit
Returns:
The origin_visit information, or None if no visit matches.
"""
cur = self._cursor(cur)
extra_clause = ""
if allowed_statuses:
extra_clause = cur.mogrify("AND status IN %s",
(tuple(allowed_statuses),)).decode()
query = """\
SELECT %s,
(select id from snapshot where object_id = snapshot_id)
as snapshot
FROM origin_visit
WHERE
origin = %%s AND snapshot_id is not null %s
ORDER BY date DESC, visit DESC
LIMIT 1
""" % (', '.join(self.origin_visit_get_cols[:-1]), extra_clause)
cur.execute(query, (origin_id,))
r = cur.fetchone()
if not r:
return None
return r
@staticmethod
def mangle_query_key(key, main_table):
if key == 'id':
return 't.id'
if key == 'parents':
return '''
ARRAY(
SELECT rh.parent_id::bytea
FROM revision_history rh
WHERE rh.id = t.id
ORDER BY rh.parent_rank
)'''
if '_' not in key:
return '%s.%s' % (main_table, key)
head, tail = key.split('_', 1)
if (head in ('author', 'committer')
and tail in ('name', 'email', 'id', 'fullname')):
return '%s.%s' % (head, tail)
return '%s.%s' % (main_table, key)
def revision_get_from_list(self, revisions, cur=None):
cur = self._cursor(cur)
query_keys = ', '.join(
self.mangle_query_key(k, 'revision')
for k in self.revision_get_cols
)
yield from execute_values_generator(
cur, """
SELECT %s FROM (VALUES %%s) as t(id)
LEFT JOIN revision ON t.id = revision.id
LEFT JOIN person author ON revision.author = author.id
LEFT JOIN person committer ON revision.committer = committer.id
""" % query_keys,
((id,) for id in revisions))
def revision_log(self, root_revisions, limit=None, cur=None):
cur = self._cursor(cur)
query = """SELECT %s
FROM swh_revision_log(%%s, %%s)
""" % ', '.join(self.revision_get_cols)
cur.execute(query, (root_revisions, limit))
yield from cur
revision_shortlog_cols = ['id', 'parents']
def revision_shortlog(self, root_revisions, limit=None, cur=None):
cur = self._cursor(cur)
query = """SELECT %s
FROM swh_revision_list(%%s, %%s)
""" % ', '.join(self.revision_shortlog_cols)
cur.execute(query, (root_revisions, limit))
yield from cur
def release_missing_from_list(self, releases, cur=None):
cur = self._cursor(cur)
yield from execute_values_generator(
cur, """
SELECT id FROM (VALUES %s) as t(id)
WHERE NOT EXISTS (
SELECT 1 FROM release r WHERE r.id = t.id
)
""", ((id,) for id in releases))
object_find_by_sha1_git_cols = ['sha1_git', 'type', 'id', 'object_id']
def object_find_by_sha1_git(self, ids, cur=None):
cur = self._cursor(cur)
yield from execute_values_generator(
cur, """
WITH t (id) AS (VALUES %s),
known_objects as ((
select
id as sha1_git,
'release'::object_type as type,
id,
object_id
from release r
where exists (select 1 from t where t.id = r.id)
) union all (
select
id as sha1_git,
'revision'::object_type as type,
id,
object_id
from revision r
where exists (select 1 from t where t.id = r.id)
) union all (
select
id as sha1_git,
'directory'::object_type as type,
id,
object_id
from directory d
where exists (select 1 from t where t.id = d.id)
) union all (
select
sha1_git as sha1_git,
'content'::object_type as type,
sha1 as id,
object_id
from content c
where exists (select 1 from t where t.id = c.sha1_git)
))
select t.id as sha1_git, k.type, k.id, k.object_id
from t
left join known_objects k on t.id = k.sha1_git
""",
((id,) for id in ids)
)
def stat_counters(self, cur=None):
cur = self._cursor(cur)
cur.execute('SELECT * FROM swh_stat_counters()')
yield from cur
fetch_history_cols = ['origin', 'date', 'status', 'result', 'stdout',
'stderr', 'duration']
def create_fetch_history(self, fetch_history, cur=None):
"""Create a fetch_history entry with the data in fetch_history"""
cur = self._cursor(cur)
query = '''INSERT INTO fetch_history (%s)
VALUES (%s) RETURNING id''' % (
','.join(self.fetch_history_cols),
','.join(['%s'] * len(self.fetch_history_cols))
)
cur.execute(query, [fetch_history.get(col) for col in
self.fetch_history_cols])
return cur.fetchone()[0]
def get_fetch_history(self, fetch_history_id, cur=None):
"""Get a fetch_history entry with the given id"""
cur = self._cursor(cur)
query = '''SELECT %s FROM fetch_history WHERE id=%%s''' % (
', '.join(self.fetch_history_cols),
)
cur.execute(query, (fetch_history_id,))
data = cur.fetchone()
if not data:
return None
ret = {'id': fetch_history_id}
for i, col in enumerate(self.fetch_history_cols):
ret[col] = data[i]
return ret
def update_fetch_history(self, fetch_history, cur=None):
"""Update the fetch_history entry from the data in fetch_history"""
cur = self._cursor(cur)
query = '''UPDATE fetch_history
SET %s
WHERE id=%%s''' % (
','.join('%s=%%s' % col for col in self.fetch_history_cols)
)
cur.execute(query, [jsonize(fetch_history.get(col)) for col in
self.fetch_history_cols + ['id']])
def origin_add(self, type, url, cur=None):
"""Insert a new origin and return the new identifier."""
insert = """INSERT INTO origin (type, url) values (%s, %s)
RETURNING id"""
cur.execute(insert, (type, url))
return cur.fetchone()[0]
origin_cols = ['id', 'type', 'url']
def origin_get_with(self, origins, cur=None):
"""Retrieve the origin id from its type and url if found."""
cur = self._cursor(cur)
query = """SELECT %s FROM (VALUES %%s) as t(type, url)
LEFT JOIN origin
ON (t.type=origin.type AND t.url=origin.url)
""" % ','.join('origin.' + col for col in self.origin_cols)
yield from execute_values_generator(
cur, query, origins)
def origin_get(self, ids, cur=None):
"""Retrieve the origin per its identifier.
"""
cur = self._cursor(cur)
query = """SELECT %s FROM (VALUES %%s) as t(id)
LEFT JOIN origin ON t.id = origin.id
""" % ','.join('origin.' + col for col in self.origin_cols)
yield from execute_values_generator(
cur, query, ((id,) for id in ids))
def _origin_query(self, url_pattern, count=False, offset=0, limit=50,
regexp=False, with_visit=False, cur=None):
"""
Method factorizing query creation for searching and counting origins.
"""
cur = self._cursor(cur)
if count:
origin_cols = 'COUNT(*)'
else:
origin_cols = ','.join(self.origin_cols)
query = """SELECT %s
FROM origin
WHERE """
if with_visit:
query += """
EXISTS (SELECT 1 from origin_visit WHERE origin=origin.id)
AND """
query += 'url %s %%s '
if not count:
query += 'ORDER BY id OFFSET %%s LIMIT %%s'
if not regexp:
query = query % (origin_cols, 'ILIKE')
query_params = ('%'+url_pattern+'%', offset, limit)
else:
query = query % (origin_cols, '~*')
query_params = (url_pattern, offset, limit)
if count:
query_params = (query_params[0],)
cur.execute(query, query_params)
def origin_search(self, url_pattern, offset=0, limit=50,
regexp=False, with_visit=False, 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 returns origins whose urls match it
with_visit (bool): if True, filter out origins with no visit
"""
self._origin_query(url_pattern, offset=offset, limit=limit,
regexp=regexp, with_visit=with_visit, cur=cur)
yield from cur
def origin_count(self, url_pattern, regexp=False,
with_visit=False, 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 returns origins whose urls match it
with_visit (bool): if True, filter out origins with no visit
"""
self._origin_query(url_pattern, count=True,
regexp=regexp, with_visit=with_visit, cur=cur)
return cur.fetchone()[0]
person_cols = ['fullname', 'name', 'email']
person_get_cols = person_cols + ['id']
def origin_get_range(self, origin_from=1, origin_count=100, 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
"""
cur = self._cursor(cur)
query = """SELECT %s
FROM origin WHERE id >= %%s
ORDER BY id LIMIT %%s
""" % ','.join(self.origin_cols)
cur.execute(query, (origin_from, origin_count))
yield from cur
def person_get(self, ids, cur=None):
"""Retrieve the persons identified by the list of ids.
"""
cur = self._cursor(cur)
query = """SELECT %s
FROM person
WHERE id IN %%s""" % ', '.join(self.person_get_cols)
cur.execute(query, (tuple(ids),))
yield from cur
release_add_cols = [
'id', 'target', 'target_type', 'date', 'date_offset',
'date_neg_utc_offset', 'name', 'comment', 'synthetic',
'author_fullname', 'author_name', 'author_email',
]
release_get_cols = release_add_cols + ['author_id']
def release_get_from_list(self, releases, cur=None):
cur = self._cursor(cur)
query_keys = ', '.join(
self.mangle_query_key(k, 'release')
for k in self.release_get_cols
)
yield from execute_values_generator(
cur, """
SELECT %s FROM (VALUES %%s) as t(id)
LEFT JOIN release ON t.id = release.id
LEFT JOIN person author ON release.author = author.id
""" % query_keys,
((id,) for id in releases))
def origin_metadata_add(self, origin, ts, provider, tool,
metadata, cur=None):
""" Add an origin_metadata for the origin at ts with provider, tool and
metadata.
Args:
origin (int): the origin's id for which the metadata is added
ts (datetime): time when the metadata was found
provider (int): the metadata provider identifier
tool (int): the tool's identifier used to extract metadata
metadata (jsonb): the metadata retrieved at the time and location
Returns:
id (int): the origin_metadata unique id
"""
cur = self._cursor(cur)
insert = """INSERT INTO origin_metadata (origin_id, discovery_date,
provider_id, tool_id, metadata) values (%s, %s, %s, %s, %s)
RETURNING id"""
cur.execute(insert, (origin, ts, provider, tool, jsonize(metadata)))
return cur.fetchone()[0]
origin_metadata_get_cols = ['origin_id', 'discovery_date',
'tool_id', 'metadata', 'provider_id',
'provider_name', 'provider_type',
'provider_url']
def origin_metadata_get_by(self, origin_id, provider_type=None, cur=None):
"""Retrieve all origin_metadata entries for one origin_id
"""
cur = self._cursor(cur)
if not provider_type:
query = '''SELECT %s
FROM swh_origin_metadata_get_by_origin(
%%s)''' % (','.join(
self.origin_metadata_get_cols))
cur.execute(query, (origin_id, ))
else:
query = '''SELECT %s
FROM swh_origin_metadata_get_by_provider_type(
%%s, %%s)''' % (','.join(
self.origin_metadata_get_cols))
cur.execute(query, (origin_id, provider_type))
yield from cur
tool_cols = ['id', 'name', 'version', 'configuration']
@stored_procedure('swh_mktemp_tool')
def mktemp_tool(self, cur=None):
pass
def tool_add_from_temp(self, cur=None):
cur = self._cursor(cur)
cur.execute("SELECT %s from swh_tool_add()" % (
','.join(self.tool_cols), ))
yield from cur
def tool_get(self, name, version, configuration, cur=None):
cur = self._cursor(cur)
cur.execute('''select %s
from tool
where name=%%s and
version=%%s and
configuration=%%s''' % (
','.join(self.tool_cols)),
(name, version, configuration))
return cur.fetchone()
metadata_provider_cols = ['id', 'provider_name', 'provider_type',
'provider_url', 'metadata']
def metadata_provider_add(self, provider_name, provider_type,
provider_url, metadata, cur=None):
"""Insert a new provider and return the new identifier."""
cur = self._cursor(cur)
insert = """INSERT INTO metadata_provider (provider_name, provider_type,
provider_url, metadata) values (%s, %s, %s, %s)
RETURNING id"""
cur.execute(insert, (provider_name, provider_type, provider_url,
jsonize(metadata)))
return cur.fetchone()[0]
def metadata_provider_get(self, provider_id, cur=None):
cur = self._cursor(cur)
cur.execute('''select %s
from metadata_provider
where id=%%s ''' % (
','.join(self.metadata_provider_cols)),
(provider_id, ))
return cur.fetchone()
def metadata_provider_get_by(self, provider_name, provider_url,
cur=None):
cur = self._cursor(cur)
cur.execute('''select %s
from metadata_provider
where provider_name=%%s and
provider_url=%%s''' % (
','.join(self.metadata_provider_cols)),
(provider_name, provider_url))
return cur.fetchone()
