flake8 and all
* update some copyright
* drop most __docformat__ declaration
* fix some flake8 warnings / errors
# copyright 2003-2016 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""SQL utilities functions and classes."""
from __future__ import print_function
import sys
import re
import subprocess
from os.path import abspath
from logging import getLogger
from datetime import time, datetime, timedelta
from six import string_types, text_type
from six.moves import filter
from pytz import utc
from logilab import database as db, common as lgc
from logilab.common.shellutils import ProgressBar, DummyProgressBar
from logilab.common.deprecation import deprecated
from logilab.common.logging_ext import set_log_methods
from logilab.common.date import utctime, utcdatetime, strptime
from logilab.database.sqlgen import SQLGenerator
from cubicweb import Binary, ConfigurationError
from cubicweb.uilib import remove_html_tags
from cubicweb.schema import PURE_VIRTUAL_RTYPES
from cubicweb.server import SQL_CONNECT_HOOKS
from cubicweb.server.utils import crypt_password
lgc.USE_MX_DATETIME = False
SQL_PREFIX = 'cw_'
def _run_command(cmd):
if isinstance(cmd, string_types):
print(cmd)
return subprocess.call(cmd, shell=True)
else:
print(' '.join(cmd))
return subprocess.call(cmd)
def sqlexec(sqlstmts, cursor_or_execute, withpb=True,
pbtitle='', delimiter=';', cnx=None):
"""execute sql statements ignoring DROP/ CREATE GROUP or USER statements
error.
:sqlstmts_as_string: a string or a list of sql statements.
:cursor_or_execute: sql cursor or a callback used to execute statements
:cnx: if given, commit/rollback at each statement.
:withpb: if True, display a progresse bar
:pbtitle: a string displayed as the progress bar title (if `withpb=True`)
:delimiter: a string used to split sqlstmts (if it is a string)
Return the failed statements (same type as sqlstmts)
"""
if hasattr(cursor_or_execute, 'execute'):
execute = cursor_or_execute.execute
else:
execute = cursor_or_execute
sqlstmts_as_string = False
if isinstance(sqlstmts, string_types):
sqlstmts_as_string = True
sqlstmts = sqlstmts.split(delimiter)
if withpb:
if sys.stdout.isatty():
pb = ProgressBar(len(sqlstmts), title=pbtitle)
else:
pb = DummyProgressBar()
failed = []
for sql in sqlstmts:
sql = sql.strip()
if withpb:
pb.update()
if not sql:
continue
try:
# some dbapi modules doesn't accept unicode for sql string
execute(str(sql))
except Exception as ex:
print(ex, file=sys.stderr)
if cnx:
cnx.rollback()
failed.append(sql)
else:
if cnx:
cnx.commit()
if withpb:
print()
if sqlstmts_as_string:
failed = delimiter.join(failed)
return failed
def sqlgrants(schema, driver, user,
text_index=True, set_owner=True,
skip_relations=(), skip_entities=()):
"""Return a list of SQL statements to give all access privileges to the given user on the
database.
"""
from cubicweb.server.schema2sql import grant_schema
from cubicweb.server.sources import native
stmts = list(native.grant_schema(user, set_owner))
if text_index:
dbhelper = db.get_db_helper(driver)
# XXX should return a list of sql statements rather than ';' joined statements
stmts += dbhelper.sql_grant_user_on_fti(user).split(';')
stmts += grant_schema(schema, user, set_owner, skip_entities=skip_entities, prefix=SQL_PREFIX)
return stmts
def sqlschema(schema, driver, text_index=True,
user=None, set_owner=False,
skip_relations=PURE_VIRTUAL_RTYPES, skip_entities=()):
"""Return the database SQL schema as a list of SQL statements, according to the given parameters.
"""
from cubicweb.server.schema2sql import schema2sql
from cubicweb.server.sources import native
if set_owner:
assert user, 'user is argument required when set_owner is true'
stmts = list(native.sql_schema(driver))
dbhelper = db.get_db_helper(driver)
if text_index:
stmts += dbhelper.sql_init_fti().split(';') # XXX
stmts += schema2sql(dbhelper, schema, prefix=SQL_PREFIX,
skip_entities=skip_entities,
skip_relations=skip_relations)
if dbhelper.users_support and user:
stmts += sqlgrants(schema, driver, user, text_index, set_owner,
skip_relations, skip_entities)
return stmts
_SQL_DROP_ALL_USER_TABLES_FILTER_FUNCTION = re.compile('^(?!(sql|pg)_)').match
def sql_drop_all_user_tables(driver_or_helper, sqlcursor):
"""Return ths sql to drop all tables found in the database system."""
if not getattr(driver_or_helper, 'list_tables', None):
dbhelper = db.get_db_helper(driver_or_helper)
else:
dbhelper = driver_or_helper
stmts = [dbhelper.sql_drop_sequence('entities_id_seq')]
# for mssql, we need to drop views before tables
if hasattr(dbhelper, 'list_views'):
stmts += ['DROP VIEW %s;' % name
for name in filter(_SQL_DROP_ALL_USER_TABLES_FILTER_FUNCTION,
dbhelper.list_views(sqlcursor))]
stmts += ['DROP TABLE %s;' % name
for name in filter(_SQL_DROP_ALL_USER_TABLES_FILTER_FUNCTION,
dbhelper.list_tables(sqlcursor))]
return stmts
class ConnectionWrapper(object):
"""handle connection to the system source, at some point associated to a
:class:`Session`
"""
# since 3.19, we only have to manage the system source connection
def __init__(self, system_source):
# dictionary of (source, connection), indexed by sources'uri
self._source = system_source
self.cnx = system_source.get_connection()
self.cu = self.cnx.cursor()
def commit(self):
"""commit the current transaction for this user"""
# let exception propagates
self.cnx.commit()
def rollback(self):
"""rollback the current transaction for this user"""
# catch exceptions, rollback other sources anyway
try:
self.cnx.rollback()
except Exception:
self._source.critical('rollback error', exc_info=sys.exc_info())
# error on rollback, the connection is much probably in a really
# bad state. Replace it by a new one.
self.reconnect()
def close(self, i_know_what_i_do=False):
"""close all connections in the set"""
if i_know_what_i_do is not True: # unexpected closing safety belt
raise RuntimeError('connections set shouldn\'t be closed')
try:
self.cu.close()
self.cu = None
except Exception:
pass
try:
self.cnx.close()
self.cnx = None
except Exception:
pass
# internals ###############################################################
def cnxset_freed(self):
"""connections set is being freed from a session"""
pass # no nothing by default
def reconnect(self):
"""reopen a connection for this source or all sources if none specified
"""
try:
# properly close existing connection if any
self.cnx.close()
except Exception:
pass
self._source.info('trying to reconnect')
self.cnx = self._source.get_connection()
self.cu = self.cnx.cursor()
@deprecated('[3.19] use .cu instead')
def __getitem__(self, uri):
assert uri == 'system'
return self.cu
@deprecated('[3.19] use repo.system_source instead')
def source(self, uid):
assert uid == 'system'
return self._source
@deprecated('[3.19] use .cnx instead')
def connection(self, uid):
assert uid == 'system'
return self.cnx
class SqliteConnectionWrapper(ConnectionWrapper):
"""Sqlite specific connection wrapper: close the connection each time it's
freed (and reopen it later when needed)
"""
def __init__(self, system_source):
# don't call parent's __init__, we don't want to initiate the connection
self._source = system_source
_cnx = None
def cnxset_freed(self):
self.cu.close()
self.cnx.close()
self.cnx = self.cu = None
@property
def cnx(self):
if self._cnx is None:
self._cnx = self._source.get_connection()
self._cu = self._cnx.cursor()
return self._cnx
@cnx.setter
def cnx(self, value):
self._cnx = value
@property
def cu(self):
if self._cnx is None:
self._cnx = self._source.get_connection()
self._cu = self._cnx.cursor()
return self._cu
@cu.setter
def cu(self, value):
self._cu = value
class SQLAdapterMixIn(object):
"""Mixin for SQL data sources, getting a connection from a configuration
dictionary and handling connection locking
"""
cnx_wrap = ConnectionWrapper
def __init__(self, source_config, repairing=False):
try:
self.dbdriver = source_config['db-driver'].lower()
dbname = source_config['db-name']
except KeyError:
raise ConfigurationError('missing some expected entries in sources file')
dbhost = source_config.get('db-host')
port = source_config.get('db-port')
dbport = port and int(port) or None
dbuser = source_config.get('db-user')
dbpassword = source_config.get('db-password')
dbencoding = source_config.get('db-encoding', 'UTF-8')
dbextraargs = source_config.get('db-extra-arguments')
dbnamespace = source_config.get('db-namespace')
self.dbhelper = db.get_db_helper(self.dbdriver)
self.dbhelper.record_connection_info(dbname, dbhost, dbport, dbuser,
dbpassword, dbextraargs,
dbencoding, dbnamespace)
self.sqlgen = SQLGenerator()
# copy back some commonly accessed attributes
dbapi_module = self.dbhelper.dbapi_module
self.OperationalError = dbapi_module.OperationalError
self.InterfaceError = dbapi_module.InterfaceError
self.DbapiError = dbapi_module.Error
self._binary = self.dbhelper.binary_value
self._process_value = dbapi_module.process_value
self._dbencoding = dbencoding
if self.dbdriver == 'sqlite':
self.cnx_wrap = SqliteConnectionWrapper
self.dbhelper.dbname = abspath(self.dbhelper.dbname)
if not repairing:
statement_timeout = int(source_config.get('db-statement-timeout', 0))
if statement_timeout > 0:
def set_postgres_timeout(cnx):
cnx.cursor().execute('SET statement_timeout to %d' % statement_timeout)
cnx.commit()
postgres_hooks = SQL_CONNECT_HOOKS['postgres']
postgres_hooks.append(set_postgres_timeout)
def wrapped_connection(self):
"""open and return a connection to the database, wrapped into a class
handling reconnection and all
"""
return self.cnx_wrap(self)
def get_connection(self):
"""open and return a connection to the database"""
return self.dbhelper.get_connection()
def backup_to_file(self, backupfile, confirm):
for cmd in self.dbhelper.backup_commands(backupfile,
keepownership=False):
if _run_command(cmd):
if not confirm(' [Failed] Continue anyway?', default='n'):
raise Exception('Failed command: %s' % cmd)
def restore_from_file(self, backupfile, confirm, drop=True):
for cmd in self.dbhelper.restore_commands(backupfile,
keepownership=False,
drop=drop):
if _run_command(cmd):
if not confirm(' [Failed] Continue anyway?', default='n'):
raise Exception('Failed command: %s' % cmd)
def merge_args(self, args, query_args):
if args is not None:
newargs = {}
for key, val in args.items():
# convert cubicweb binary into db binary
if isinstance(val, Binary):
val = self._binary(val.getvalue())
# convert timestamp to utc.
# expect SET TiME ZONE to UTC at connection opening time.
# This shouldn't change anything for datetime without TZ.
elif isinstance(val, datetime) and val.tzinfo is not None:
val = utcdatetime(val)
elif isinstance(val, time) and val.tzinfo is not None:
val = utctime(val)
newargs[key] = val
# should not collide
assert not (frozenset(newargs) & frozenset(query_args)), \
'unexpected collision: %s' % (frozenset(newargs) & frozenset(query_args))
newargs.update(query_args)
return newargs
return query_args
def process_result(self, cursor, cnx=None, column_callbacks=None):
"""return a list of CubicWeb compliant values from data in the given cursor
"""
return list(self.iter_process_result(cursor, cnx, column_callbacks))
def iter_process_result(self, cursor, cnx, column_callbacks=None):
"""return a iterator on tuples of CubicWeb compliant values from data
in the given cursor
"""
# use two different implementations to avoid paying the price of
# callback lookup for each *cell* in results when there is nothing to
# lookup
if not column_callbacks:
return self.dbhelper.dbapi_module.process_cursor(cursor, self._dbencoding,
Binary)
assert cnx
return self._cb_process_result(cursor, column_callbacks, cnx)
def _cb_process_result(self, cursor, column_callbacks, cnx):
# begin bind to locals for optimization
descr = cursor.description
encoding = self._dbencoding
process_value = self._process_value
binary = Binary
# /end
cursor.arraysize = 100
while True:
results = cursor.fetchmany()
if not results:
break
for line in results:
result = []
for col, value in enumerate(line):
if value is None:
result.append(value)
continue
cbstack = column_callbacks.get(col, None)
if cbstack is None:
value = process_value(value, descr[col], encoding, binary)
else:
for cb in cbstack:
value = cb(self, cnx, value)
result.append(value)
yield result
def preprocess_entity(self, entity):
"""return a dictionary to use as extra argument to cursor.execute
to insert/update an entity into a SQL database
"""
attrs = {}
eschema = entity.e_schema
converters = getattr(self.dbhelper, 'TYPE_CONVERTERS', {})
for attr, value in entity.cw_edited.items():
if value is not None and eschema.subjrels[attr].final:
atype = str(entity.e_schema.destination(attr))
if atype in converters:
# It is easier to modify preprocess_entity rather
# than add_entity (native) as this behavior
# may also be used for update.
value = converters[atype](value)
elif atype == 'Password': # XXX could be done using a TYPE_CONVERTERS callback
# if value is a Binary instance, this mean we got it
# from a query result and so it is already encrypted
if isinstance(value, Binary):
value = value.getvalue()
else:
value = crypt_password(value)
value = self._binary(value)
elif isinstance(value, Binary):
value = self._binary(value.getvalue())
attrs[SQL_PREFIX + str(attr)] = value
attrs[SQL_PREFIX + 'eid'] = entity.eid
return attrs
# these are overridden by set_log_methods below
# only defining here to prevent pylint from complaining
info = warning = error = critical = exception = debug = lambda msg, *a, **kw: None
set_log_methods(SQLAdapterMixIn, getLogger('cubicweb.sqladapter'))
# connection initialization functions ##########################################
def _install_sqlite_querier_patch():
"""This monkey-patch hotfixes a bug sqlite causing some dates to be returned as strings rather than
date objects (http://www.sqlite.org/cvstrac/tktview?tn=1327,33)
"""
from cubicweb.server.querier import QuerierHelper
if hasattr(QuerierHelper, '_sqlite_patched'):
return # already monkey patched
def wrap_execute(base_execute):
def new_execute(*args, **kwargs):
rset = base_execute(*args, **kwargs)
if rset.description:
found_date = False
for row, rowdesc in zip(rset, rset.description):
for cellindex, (value, vtype) in enumerate(zip(row, rowdesc)):
if vtype in ('TZDatetime', 'Date', 'Datetime') \
and isinstance(value, text_type):
found_date = True
value = value.rsplit('.', 1)[0]
try:
row[cellindex] = strptime(value, '%Y-%m-%d %H:%M:%S')
except Exception:
row[cellindex] = strptime(value, '%Y-%m-%d')
if vtype == 'TZDatetime':
row[cellindex] = row[cellindex].replace(tzinfo=utc)
if vtype == 'Time' and isinstance(value, text_type):
found_date = True
try:
row[cellindex] = strptime(value, '%H:%M:%S')
except Exception:
# DateTime used as Time?
row[cellindex] = strptime(value, '%Y-%m-%d %H:%M:%S')
if vtype == 'Interval' and isinstance(value, int):
found_date = True
# XXX value is in number of seconds?
row[cellindex] = timedelta(0, value, 0)
if not found_date:
break
return rset
return new_execute
QuerierHelper.execute = wrap_execute(QuerierHelper.execute)
QuerierHelper._sqlite_patched = True
def _init_sqlite_connection(cnx):
"""Internal function that will be called to init a sqlite connection"""
_install_sqlite_querier_patch()
class group_concat(object):
def __init__(self):
self.values = set()
def step(self, value):
if value is not None:
self.values.add(value)
def finalize(self):
return ', '.join(text_type(v) for v in self.values)
cnx.create_aggregate("GROUP_CONCAT", 1, group_concat)
def _limit_size(text, maxsize, format='text/plain'):
if len(text) < maxsize:
return text
if format in ('text/html', 'text/xhtml', 'text/xml'):
text = remove_html_tags(text)
if len(text) > maxsize:
text = text[:maxsize] + '...'
return text
def limit_size3(text, format, maxsize):
return _limit_size(text, maxsize, format)
cnx.create_function("LIMIT_SIZE", 3, limit_size3)
def limit_size2(text, maxsize):
return _limit_size(text, maxsize)
cnx.create_function("TEXT_LIMIT_SIZE", 2, limit_size2)
from logilab.common.date import strptime
def weekday(ustr):
try:
dt = strptime(ustr, '%Y-%m-%d %H:%M:%S')
except:
dt = strptime(ustr, '%Y-%m-%d')
# expect sunday to be 1, saturday 7 while weekday method return 0 for
# monday
return (dt.weekday() + 1) % 7
cnx.create_function("WEEKDAY", 1, weekday)
cnx.cursor().execute("pragma foreign_keys = on")
import yams.constraints
yams.constraints.patch_sqlite_decimal()
sqlite_hooks = SQL_CONNECT_HOOKS.setdefault('sqlite', [])
sqlite_hooks.append(_init_sqlite_connection)
def _init_postgres_connection(cnx):
"""Internal function that will be called to init a postgresql connection"""
cnx.cursor().execute('SET TIME ZONE UTC')
# commit is needed, else setting are lost if the connection is first
# rolled back
cnx.commit()
postgres_hooks = SQL_CONNECT_HOOKS.setdefault('postgres', [])
postgres_hooks.append(_init_postgres_connection)