devtools/dataimport.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
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# -*- coding: utf-8 -*-
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"""This module provides tools to import tabular data.
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:organization: Logilab
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:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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Example of use (run this with `cubicweb-ctl shell instance import-script.py`):
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.. sourcecode:: python
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  from cubicweb.devtools.dataimport import *
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  # define data generators
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  GENERATORS = []
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  USERS = [('Prenom', 'firstname', ()),
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           ('Nom', 'surname', ()),
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           ('Identifiant', 'login', ()),
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           ]
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  def gen_users(ctl):
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      for row in ctl.get_data('utilisateurs'):
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          entity = mk_entity(row, USERS)
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          entity['upassword'] = u'motdepasse'
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          ctl.check('login', entity['login'], None)
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          ctl.store.add('CWUser', entity)
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          email = {'address': row['email']}
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          ctl.store.add('EmailAddress', email)
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          ctl.store.relate(entity['eid'], 'use_email', email['eid'])
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          ctl.store.rql('SET U in_group G WHERE G name "users", U eid %(x)s', {'x':entity['eid']})
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  CHK = [('login', check_doubles, 'Utilisateurs Login',
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          'Deux utilisateurs ne devraient pas avoir le même login.'),
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         ]
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  GENERATORS.append( (gen_users, CHK) )
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  # create controller
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  ctl = CWImportController(RQLObjectStore())
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  ctl.askerror = True
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  ctl.generators = GENERATORS
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  ctl.store._checkpoint = checkpoint
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  ctl.store._rql = rql
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  ctl.data['utilisateurs'] = lazytable(utf8csvreader(open('users.csv')))
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  # run
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  ctl.run()
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  sys.exit(0)
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"""
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__docformat__ = "restructuredtext en"
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import sys
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import csv
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import traceback
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import os.path as osp
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from StringIO import StringIO
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from logilab.common import shellutils
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from logilab.common.deprecation import deprecated
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def ucsvreader_pb(filepath, encoding='utf-8', separator=',', quote='"',
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                  skipfirst=False, withpb=True):
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    """same as ucsvreader but a progress bar is displayed as we iter on rows"""
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    if not osp.exists(filepath):
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        raise Exception("file doesn't exists: %s" % filepath)
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    rowcount = int(shellutils.Execute('wc -l "%s"' % filepath).out.strip().split()[0])
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    if skipfirst:
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        rowcount -= 1
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    if withpb:
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        pb = shellutils.ProgressBar(rowcount, 50)
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    for urow in ucsvreader(file(filepath), encoding, separator, quote, skipfirst):
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        yield urow
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        if withpb:
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            pb.update()
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    print ' %s rows imported' % rowcount
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def ucsvreader(stream, encoding='utf-8', separator=',', quote='"',
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               skipfirst=False):
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    """A csv reader that accepts files with any encoding and outputs unicode
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    strings
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    """
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    it = iter(csv.reader(stream, delimiter=separator, quotechar=quote))
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    if skipfirst:
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        it.next()
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    for row in it:
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        yield [item.decode(encoding) for item in row]
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utf8csvreader = deprecated('use ucsvreader instead')(ucsvreader)
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def commit_every(nbit, store, it):
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    for i, x in enumerate(it):
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        yield x
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        if nbit is not None and i % nbit:
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            store.checkpoint()
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    if nbit is not None:
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        store.checkpoint()
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def lazytable(reader):
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    """The first row is taken to be the header of the table and
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    used to output a dict for each row of data.
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    >>> data = lazytable(utf8csvreader(open(filename)))
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    """
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    header = reader.next()
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    for row in reader:
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        yield dict(zip(header, row))
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def mk_entity(row, map):
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    """Return a dict made from sanitized mapped values.
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    >>> row = {'myname': u'dupont'}
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    >>> map = [('myname', u'name', (capitalize_if_unicase,))]
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    >>> mk_entity(row, map)
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    {'name': u'Dupont'}
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    """
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    res = {}
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    for src, dest, funcs in map:
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        res[dest] = row[src]
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        for func in funcs:
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            res[dest] = func(res[dest])
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    return res
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# user interactions ############################################################
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def tell(msg):
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    print msg
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def confirm(question):
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    """A confirm function that asks for yes/no/abort and exits on abort."""
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    answer = shellutils.ASK.ask(question, ('Y','n','abort'), 'Y')
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    if answer == 'abort':
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        sys.exit(1)
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    return answer == 'Y'
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class catch_error(object):
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    """Helper for @contextmanager decorator."""
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    def __init__(self, ctl, key='unexpected error', msg=None):
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        self.ctl = ctl
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        self.key = key
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        self.msg = msg
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    def __enter__(self):
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        return self
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    def __exit__(self, type, value, traceback):
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        if type is not None:
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            if issubclass(type, (KeyboardInterrupt, SystemExit)):
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                return # re-raise
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            if self.ctl.catcherrors:
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                self.ctl.record_error(self.key, None, type, value, traceback)
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                return True # silent
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# base sanitizing functions ####################################################
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def capitalize_if_unicase(txt):
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    if txt.isupper() or txt.islower():
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        return txt.capitalize()
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    return txt
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def no_space(txt):
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    return txt.replace(' ','')
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def no_uspace(txt):
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    return txt.replace(u'\xa0','')
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def no_dash(txt):
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    return txt.replace('-','')
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def alldigits(txt):
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    if txt.isdigit():
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        return txt
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    else:
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        return u''
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def strip(txt):
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    return txt.strip()
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# base integrity checking functions ############################################
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def check_doubles(buckets):
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    """Extract the keys that have more than one item in their bucket."""
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    return [(key, len(value)) for key,value in buckets.items() if len(value) > 1]
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def check_doubles_not_none(buckets):
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    """Extract the keys that have more than one item in their bucket."""
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    return [(key, len(value)) for key,value in buckets.items() if key is not None and len(value) > 1]
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# object stores #################################################################
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class ObjectStore(object):
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    """Store objects in memory for faster testing. Will not
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    enforce the constraints of the schema and hence will miss
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    some problems.
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    >>> store = ObjectStore()
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    >>> user = {'login': 'johndoe'}
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    >>> store.add('CWUser', user)
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    >>> group = {'name': 'unknown'}
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    >>> store.add('CWUser', group)
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    >>> store.relate(user['eid'], 'in_group', group['eid'])
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    """
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    def __init__(self):
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        self.items = []
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        self.eids = {}
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        self.types = {}
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        self.relations = set()
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        self.indexes = {}
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        self._rql = None
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        self._checkpoint = None
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    def _put(self, type, item):
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        self.items.append(item)
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        return len(self.items) - 1
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    def add(self, type, item):
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        assert isinstance(item, dict), 'item is not a dict but a %s' % type(item)
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        eid = item['eid'] = self._put(type, item)
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        self.eids[eid] = item
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        self.types.setdefault(type, []).append(eid)
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    def relate(self, eid_from, rtype, eid_to):
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        eids_valid = (eid_from < len(self.items) and eid_to <= len(self.items))
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        assert eids_valid, 'eid error %s %s' % (eid_from, eid_to)
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        self.relations.add( (eid_from, rtype, eid_to) )
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    def build_index(self, name, type, func):
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        index = {}
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        for eid in self.types[type]:
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            index.setdefault(func(self.eids[eid]), []).append(eid)
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        self.indexes[name] = index
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    def get_many(self, name, key):
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        return self.indexes[name].get(key, [])
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    def get_one(self, name, key):
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        eids = self.indexes[name].get(key, [])
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        assert len(eids) == 1, 'expected a single one got %i' % len(eids)
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        return eids[0]
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    def find(self, type, key, value):
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        for idx in self.types[type]:
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            item = self.items[idx]
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            if item[key] == value:
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                yield item
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    def checkpoint(self):
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        pass
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class RQLObjectStore(ObjectStore):
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    """ObjectStore that works with an actual RQL repository."""
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    _rql = None # bw compat
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    def __init__(self, session=None, checkpoint=None):
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        ObjectStore.__init__(self)
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        if session is not None:
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            if not hasattr(session, 'set_pool'):
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                # connection
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                cnx = session
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                session = session.request()
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                session.set_pool = lambda : None
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                checkpoint = checkpoint or cnx.commit
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            self.session = session
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            self.checkpoint = checkpoint or session.commit
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        elif checkpoint is not None:
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            self.checkpoint = checkpoint
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    def rql(self, *args):
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        if self._rql is not None:
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            return self._rql(*args)
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        self.session.set_pool()
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        return self.session.execute(*args)
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    def create_entity(self, *args, **kwargs):
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        self.session.set_pool()
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        entity = self.session.create_entity(*args, **kwargs)
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        self.eids[entity.eid] = entity
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        self.types.setdefault(args[0], []).append(entity.eid)
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        return entity
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    def _put(self, type, item):
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        query = ('INSERT %s X: ' % type) + ', '.join(['X %s %%(%s)s' % (key,key) for key in item])
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        return self.rql(query, item)[0][0]
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    def relate(self, eid_from, rtype, eid_to):
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        self.rql('SET X %s Y WHERE X eid %%(x)s, Y eid %%(y)s' % rtype,
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                  {'x': int(eid_from), 'y': int(eid_to)}, ('x', 'y'))
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        self.relations.add( (eid_from, rtype, eid_to) )
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# the import controller ########################################################
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class CWImportController(object):
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    """Controller of the data import process.
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    >>> ctl = CWImportController(store)
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    >>> ctl.generators = list_of_data_generators
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    >>> ctl.data = dict_of_data_tables
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    >>> ctl.run()
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    """
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    def __init__(self, store, askerror=False, catcherrors=None, tell=tell,
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                 commitevery=50):
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        self.store = store
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        self.generators = None
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        self.data = {}
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        self.errors = None
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        self.askerror = askerror
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        if  catcherrors is None:
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            catcherrors = askerror
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        self.catcherrors = catcherrors
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        self.commitevery = commitevery # set to None to do a single commit
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        self._tell = tell
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    def check(self, type, key, value):
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        self._checks.setdefault(type, {}).setdefault(key, []).append(value)
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    def check_map(self, entity, key, map, default):
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        try:
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            entity[key] = map[entity[key]]
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        except KeyError:
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            self.check(key, entity[key], None)
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            entity[key] = default
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    def record_error(self, key, msg=None, type=None, value=None, tb=None):
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        tmp = StringIO()
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        if type is None:
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            traceback.print_exc(file=tmp)
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        else:
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            traceback.print_exception(type, value, tb, file=tmp)
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        print tmp.getvalue()
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        # use a list to avoid counting a <nb lines> errors instead of one
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        errorlog = self.errors.setdefault(key, [])
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        if msg is None:
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            errorlog.append(tmp.getvalue().splitlines())
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   345
        else:
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            errorlog.append( (msg, tmp.getvalue().splitlines()) )
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    def run(self):
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        self.errors = {}
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        for func, checks in self.generators:
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            self._checks = {}
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            func_name = func.__name__[4:]  # XXX
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            self.tell('Importing %s' % func_name)
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            try:
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                func(self)
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   356
            except:
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diff changeset
   357
                if self.catcherrors:
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parents: 4140
diff changeset
   358
                    self.record_error(func_name, 'While calling %s' % func.__name__)
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parents: 4140
diff changeset
   359
                else:
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parents: 4140
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   360
                    raise
2974
3dfe497e5afa F tools to import data
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parents:
diff changeset
   361
            for key, func, title, help in checks:
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parents:
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   362
                buckets = self._checks.get(key)
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parents:
diff changeset
   363
                if buckets:
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parents:
diff changeset
   364
                    err = func(buckets)
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parents:
diff changeset
   365
                    if err:
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parents:
diff changeset
   366
                        self.errors[title] = (help, err)
4152
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parents: 4140
diff changeset
   367
        self.store.checkpoint()
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46ddd27a4ca4 tweaks output
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parents: 4136
diff changeset
   368
        self.tell('\nImport completed: %i entities (%i types), %i relations'
3003
2944ee420dca R [dataimport] rename uid to eid
Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents: 2974
diff changeset
   369
                  % (len(self.store.eids), len(self.store.types),
4136
47060a66c97f dataimport refactoring / improvments, keeping bw compat (for now)
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parents: 3486
diff changeset
   370
                     len(self.store.relations)))
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parents: 3486
diff changeset
   371
        nberrors = sum(len(err[1]) for err in self.errors.values())
47060a66c97f dataimport refactoring / improvments, keeping bw compat (for now)
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parents: 3486
diff changeset
   372
        if nberrors:
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parents: 3486
diff changeset
   373
            print '%s errors' % nberrors
47060a66c97f dataimport refactoring / improvments, keeping bw compat (for now)
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3486
diff changeset
   374
        if self.errors and self.askerror and confirm('Display errors?'):
2974
3dfe497e5afa F tools to import data
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parents:
diff changeset
   375
            import pprint
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parents:
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   376
            pprint.pprint(self.errors)
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parents:
diff changeset
   377
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parents:
diff changeset
   378
    def get_data(self, key):
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parents:
diff changeset
   379
        return self.data.get(key)
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parents:
diff changeset
   380
3dfe497e5afa F tools to import data
Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents:
diff changeset
   381
    def index(self, name, key, value):
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parents:
diff changeset
   382
        self.store.indexes.setdefault(name, {}).setdefault(key, []).append(value)
3dfe497e5afa F tools to import data
Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents:
diff changeset
   383
3dfe497e5afa F tools to import data
Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents:
diff changeset
   384
    def tell(self, msg):
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Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents:
diff changeset
   385
        self._tell(msg)
3dfe497e5afa F tools to import data
Nicolas Chauvat <nicolas.chauvat@logilab.fr>
parents:
diff changeset
   386
4152
30fd1229137d new catch_error context manager, nicer controller __init__ and new iter_and_commit(datakey) method
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4140
diff changeset
   387
    def iter_and_commit(self, datakey):
30fd1229137d new catch_error context manager, nicer controller __init__ and new iter_and_commit(datakey) method
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4140
diff changeset
   388
        """iter rows, triggering commit every self.commitevery iterations"""
30fd1229137d new catch_error context manager, nicer controller __init__ and new iter_and_commit(datakey) method
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4140
diff changeset
   389
        return commit_every(self.commitevery, self.store, self.get_data(datakey))