# copyright 2003-2015 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/>.
"""Old and deprecated dataimport API that provides tools to import tabular data.
Example of use (run this with `cubicweb-ctl shell instance import-script.py`):
.. sourcecode:: python
from cubicweb.dataimport import *
# define data generators
GENERATORS = []
USERS = [('Prenom', 'firstname', ()),
('Nom', 'surname', ()),
('Identifiant', 'login', ()),
]
def gen_users(ctl):
for row in ctl.iter_and_commit('utilisateurs'):
entity = mk_entity(row, USERS)
entity['upassword'] = 'motdepasse'
ctl.check('login', entity['login'], None)
entity = ctl.store.prepare_insert_entity('CWUser', **entity)
email = ctl.store.prepare_insert_entity('EmailAddress', address=row['email'])
ctl.store.prepare_insert_relation(entity, 'use_email', email)
ctl.store.rql('SET U in_group G WHERE G name "users", U eid %(x)s', {'x': entity})
CHK = [('login', check_doubles, 'Utilisateurs Login',
'Deux utilisateurs ne devraient pas avoir le meme login.'),
]
GENERATORS.append( (gen_users, CHK) )
# create controller
ctl = CWImportController(RQLObjectStore(cnx))
ctl.askerror = 1
ctl.generators = GENERATORS
ctl.data['utilisateurs'] = lazytable(ucsvreader(open('users.csv')))
# run
ctl.run()
.. BUG file with one column are not parsable
.. TODO rollback() invocation is not possible yet
"""
from __future__ import print_function
import sys
import traceback
from io import StringIO
from six import add_metaclass
from logilab.common import attrdict, shellutils
from logilab.common.date import strptime
from logilab.common.deprecation import deprecated, class_deprecated
from cubicweb import QueryError
from cubicweb.dataimport import callfunc_every
@deprecated('[3.21] deprecated')
def lazytable(reader):
"""The first row is taken to be the header of the table and
used to output a dict for each row of data.
>>> data = lazytable(ucsvreader(open(filename)))
"""
header = next(reader)
for row in reader:
yield dict(zip(header, row))
@deprecated('[3.21] deprecated')
def lazydbtable(cu, table, headers, orderby=None):
"""return an iterator on rows of a sql table. On each row, fetch columns
defined in headers and return values as a dictionary.
>>> data = lazydbtable(cu, 'experimentation', ('id', 'nickname', 'gps'))
"""
sql = 'SELECT %s FROM %s' % (','.join(headers), table,)
if orderby:
sql += ' ORDER BY %s' % ','.join(orderby)
cu.execute(sql)
while True:
row = cu.fetchone()
if row is None:
break
yield dict(zip(headers, row))
@deprecated('[3.21] deprecated')
def tell(msg):
print(msg)
@deprecated('[3.21] deprecated')
def confirm(question):
"""A confirm function that asks for yes/no/abort and exits on abort."""
answer = shellutils.ASK.ask(question, ('Y', 'n', 'abort'), 'Y')
if answer == 'abort':
sys.exit(1)
return answer == 'Y'
@add_metaclass(class_deprecated)
class catch_error(object):
"""Helper for @contextmanager decorator."""
__deprecation_warning__ = '[3.21] deprecated'
def __init__(self, ctl, key='unexpected error', msg=None):
self.ctl = ctl
self.key = key
self.msg = msg
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
if type is not None:
if issubclass(type, (KeyboardInterrupt, SystemExit)):
return # re-raise
if self.ctl.catcherrors:
self.ctl.record_error(self.key, None, type, value, traceback)
return True # silent
@deprecated('[3.21] deprecated')
def mk_entity(row, map):
"""Return a dict made from sanitized mapped values.
ValueError can be raised on unexpected values found in checkers
>>> row = {'myname': u'dupont'}
>>> map = [('myname', u'name', (call_transform_method('title'),))]
>>> mk_entity(row, map)
{'name': u'Dupont'}
>>> row = {'myname': u'dupont', 'optname': u''}
>>> map = [('myname', u'name', (call_transform_method('title'),)),
... ('optname', u'MARKER', (optional,))]
>>> mk_entity(row, map)
{'name': u'Dupont', 'optname': None}
"""
res = {}
assert isinstance(row, dict)
assert isinstance(map, list)
for src, dest, funcs in map:
try:
res[dest] = row[src]
except KeyError:
continue
try:
for func in funcs:
res[dest] = func(res[dest])
if res[dest] is None:
break
except ValueError as err:
exc = ValueError('error with %r field: %s' % (src, err))
exc.__traceback__ = sys.exc_info()[-1]
raise exc
return res
# base sanitizing/coercing functions ###########################################
@deprecated('[3.21] deprecated')
def optional(value):
"""checker to filter optional field
If value is undefined (ex: empty string), return None that will
break the checkers validation chain
General use is to add 'optional' check in first condition to avoid
ValueError by further checkers
>>> MAPPER = [(u'value', 'value', (optional, int))]
>>> row = {'value': u'XXX'}
>>> mk_entity(row, MAPPER)
{'value': None}
>>> row = {'value': u'100'}
>>> mk_entity(row, MAPPER)
{'value': 100}
"""
if value:
return value
return None
@deprecated('[3.21] deprecated')
def required(value):
"""raise ValueError if value is empty
This check should be often found in last position in the chain.
"""
if value:
return value
raise ValueError("required")
@deprecated('[3.21] deprecated')
def todatetime(format='%d/%m/%Y'):
"""return a transformation function to turn string input value into a
`datetime.datetime` instance, using given format.
Follow it by `todate` or `totime` functions from `logilab.common.date` if
you want a `date`/`time` instance instead of `datetime`.
"""
def coerce(value):
return strptime(value, format)
return coerce
@deprecated('[3.21] deprecated')
def call_transform_method(methodname, *args, **kwargs):
"""return value returned by calling the given method on input"""
def coerce(value):
return getattr(value, methodname)(*args, **kwargs)
return coerce
@deprecated('[3.21] deprecated')
def call_check_method(methodname, *args, **kwargs):
"""check value returned by calling the given method on input is true,
else raise ValueError
"""
def check(value):
if getattr(value, methodname)(*args, **kwargs):
return value
raise ValueError('%s not verified on %r' % (methodname, value))
return check
# base integrity checking functions ############################################
@deprecated('[3.21] deprecated')
def check_doubles(buckets):
"""Extract the keys that have more than one item in their bucket."""
return [(k, len(v)) for k, v in buckets.items() if len(v) > 1]
@deprecated('[3.21] deprecated')
def check_doubles_not_none(buckets):
"""Extract the keys that have more than one item in their bucket."""
return [(k, len(v)) for k, v in buckets.items()
if k is not None and len(v) > 1]
@add_metaclass(class_deprecated)
[docs]class ObjectStore(object):
"""Store objects in memory for *faster* validation (development mode)
But it will not enforce the constraints of the schema and hence will miss some problems
>>> store = ObjectStore()
>>> user = store.prepare_insert_entity('CWUser', login=u'johndoe')
>>> group = store.prepare_insert_entity('CWUser', name=u'unknown')
>>> store.prepare_insert_relation(user, 'in_group', group)
"""
__deprecation_warning__ = '[3.21] use the new importer API'
def __init__(self):
self.items = []
self.eids = {}
self.types = {}
self.relations = set()
self.indexes = {}
[docs] def prepare_insert_entity(self, etype, **data):
"""Given an entity type, attributes and inlined relations, return an eid for the entity that
would be inserted with a real store.
"""
data = attrdict(data)
data['eid'] = eid = len(self.items)
self.items.append(data)
self.eids[eid] = data
self.types.setdefault(etype, []).append(eid)
return eid
[docs] def prepare_update_entity(self, etype, eid, **kwargs):
"""Given an entity type and eid, updates the corresponding fake entity with specified
attributes and inlined relations.
"""
assert eid in self.types[etype], 'Trying to update with wrong type %s' % etype
data = self.eids[eid]
data.update(kwargs)
[docs] def prepare_insert_relation(self, eid_from, rtype, eid_to, **kwargs):
"""Store into the `relations` attribute that a relation ``rtype`` exists between entities
with eids ``eid_from`` and ``eid_to``.
"""
relation = eid_from, rtype, eid_to
self.relations.add(relation)
return relation
[docs] def flush(self):
"""Nothing to flush for this store."""
pass
[docs] def commit(self):
"""Nothing to commit for this store."""
return
[docs] def finish(self):
"""Nothing to do once import is terminated for this store."""
pass
@property
def nb_inserted_entities(self):
return len(self.eids)
@property
def nb_inserted_types(self):
return len(self.types)
@property
def nb_inserted_relations(self):
return len(self.relations)
@deprecated('[3.21] use prepare_insert_entity instead')
def create_entity(self, etype, **data):
self.prepare_insert_entity(etype, **data)
return attrdict(data)
@deprecated('[3.21] use prepare_insert_relation instead')
def relate(self, eid_from, rtype, eid_to, **kwargs):
self.prepare_insert_relation(eid_from, rtype, eid_to, **kwargs)
@add_metaclass(class_deprecated)
[docs]class CWImportController(object):
"""Controller of the data import process.
>>> ctl = CWImportController(store)
>>> ctl.generators = list_of_data_generators
>>> ctl.data = dict_of_data_tables
>>> ctl.run()
"""
__deprecation_warning__ = '[3.21] use the new importer API'
def __init__(self, store, askerror=0, catcherrors=None, tell=tell,
commitevery=50):
self.store = store
self.generators = None
self.data = {}
self.errors = None
self.askerror = askerror
if catcherrors is None:
catcherrors = askerror
self.catcherrors = catcherrors
self.commitevery = commitevery # set to None to do a single commit
self._tell = tell
def check(self, type, key, value):
self._checks.setdefault(type, {}).setdefault(key, []).append(value)
def check_map(self, entity, key, map, default):
try:
entity[key] = map[entity[key]]
except KeyError:
self.check(key, entity[key], None)
entity[key] = default
def record_error(self, key, msg=None, type=None, value=None, tb=None):
tmp = StringIO()
if type is None:
traceback.print_exc(file=tmp)
else:
traceback.print_exception(type, value, tb, file=tmp)
# use a list to avoid counting a <nb lines> errors instead of one
errorlog = self.errors.setdefault(key, [])
if msg is None:
errorlog.append(tmp.getvalue().splitlines())
else:
errorlog.append( (msg, tmp.getvalue().splitlines()) )
def run(self):
self.errors = {}
if self.commitevery is None:
self.tell('Will commit all or nothing.')
else:
self.tell('Will commit every %s iterations' % self.commitevery)
for func, checks in self.generators:
self._checks = {}
func_name = func.__name__
self.tell("Run import function '%s'..." % func_name)
try:
func(self)
except Exception:
if self.catcherrors:
self.record_error(func_name, 'While calling %s' % func.__name__)
else:
self._print_stats()
raise
for key, func, title, help in checks:
buckets = self._checks.get(key)
if buckets:
err = func(buckets)
if err:
self.errors[title] = (help, err)
try:
txuuid = self.store.commit()
if txuuid is not None:
self.tell('Transaction commited (txuuid: %s)' % txuuid)
except QueryError as ex:
self.tell('Transaction aborted: %s' % ex)
self._print_stats()
if self.errors:
if self.askerror == 2 or (self.askerror and confirm('Display errors ?')):
from pprint import pformat
for errkey, error in self.errors.items():
self.tell("\n%s (%s): %d\n" % (error[0], errkey, len(error[1])))
self.tell(pformat(sorted(error[1])))
def _print_stats(self):
nberrors = sum(len(err) for err in self.errors.values())
self.tell('\nImport statistics: %i entities, %i types, %i relations and %i errors'
% (self.store.nb_inserted_entities,
self.store.nb_inserted_types,
self.store.nb_inserted_relations,
nberrors))
def get_data(self, key):
return self.data.get(key)
[docs] def index(self, name, key, value, unique=False):
"""create a new index
If unique is set to True, only first occurence will be kept not the following ones
"""
if unique:
try:
if value in self.store.indexes[name][key]:
return
except KeyError:
# we're sure that one is the first occurence; so continue...
pass
self.store.indexes.setdefault(name, {}).setdefault(key, []).append(value)
def tell(self, msg):
self._tell(msg)
[docs] def iter_and_commit(self, datakey):
"""iter rows, triggering commit every self.commitevery iterations"""
if self.commitevery is None:
return self.get_data(datakey)
else:
return callfunc_every(self.store.commit,
self.commitevery,
self.get_data(datakey))
