sobjects/parsers.py
author nico
Mon, 14 Feb 2011 09:38:03 +0100
changeset 6988 2f4a7d1e15b3
parent 6975 75a232b2e477
child 6994 4b2c7e401065
permissions -rw-r--r--
[hooks] do not break if no entity created or updated during feed update
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# copyright 2010-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""datafeed parser for xml generated by cubicweb"""
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import urllib2
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import StringIO
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import os.path as osp
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from cookielib import CookieJar
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from datetime import datetime, timedelta
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from lxml import etree
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from logilab.common.date import todate, totime
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from logilab.common.textutils import splitstrip, text_to_dict
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from yams.constraints import BASE_CONVERTERS
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from yams.schema import role_name as rn
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from cubicweb import ValidationError, typed_eid
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from cubicweb.server.sources import datafeed
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def ensure_str_keys(dict):
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    for key in dict:
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        dict[str(key)] = dict.pop(key)
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# see cubicweb.web.views.xmlrss.SERIALIZERS
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DEFAULT_CONVERTERS = BASE_CONVERTERS.copy()
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DEFAULT_CONVERTERS['String'] = unicode
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DEFAULT_CONVERTERS['Password'] = lambda x: x.encode('utf8')
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def convert_date(ustr):
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    return todate(datetime.strptime(ustr, '%Y-%m-%d'))
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DEFAULT_CONVERTERS['Date'] = convert_date
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def convert_datetime(ustr):
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    return datetime.strptime(ustr, '%Y-%m-%d %H:%M:%S')
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DEFAULT_CONVERTERS['Datetime'] = convert_datetime
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def convert_time(ustr):
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    return totime(datetime.strptime(ustr, '%H:%M:%S'))
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DEFAULT_CONVERTERS['Time'] = convert_time
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def convert_interval(ustr):
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    return time(seconds=int(ustr))
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DEFAULT_CONVERTERS['Interval'] = convert_interval
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# use a cookie enabled opener to use session cookie if any
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_OPENER = urllib2.build_opener(urllib2.HTTPCookieProcessor(CookieJar()))
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def extract_typed_attrs(eschema, stringdict, converters=DEFAULT_CONVERTERS):
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    typeddict = {}
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    for rschema in eschema.subject_relations():
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        if rschema.final and rschema in stringdict:
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            if rschema == 'eid':
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                continue
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            attrtype = eschema.destination(rschema)
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            typeddict[rschema.type] = converters[attrtype](stringdict[rschema])
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    return typeddict
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def _entity_etree(parent):
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    for node in list(parent):
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        item = {'cwtype': unicode(node.tag),
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                'cwuri': node.attrib['cwuri'],
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                'eid': typed_eid(node.attrib['eid']),
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                }
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        rels = {}
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        for child in node:
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            role = child.get('role')
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            if child.get('role'):
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                # relation
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                related = rels.setdefault(role, {}).setdefault(child.tag, [])
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                related += [ritem for ritem, _ in _entity_etree(child)]
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            else:
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                # attribute
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                item[child.tag] = unicode(child.text)
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        yield item, rels
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def build_search_rql(etype, attrs):
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    restrictions = []
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    for attr in attrs:
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        restrictions.append('X %(attr)s %%(%(attr)s)s' % {'attr': attr})
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    return 'Any X WHERE X is %s, %s' % (etype, ','.join(restrictions))
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def rtype_role_rql(rtype, role):
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    if role == 'object':
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        return 'Y %s X WHERE X eid %%(x)s' % rtype
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    else:
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        return 'X %s Y WHERE X eid %%(x)s' % rtype
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def _check_no_option(action, options, eid, _):
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    if options:
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        msg = _("'%s' action doesn't take any options") % action
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        raise ValidationError(eid, {rn('options', 'subject'): msg})
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def _check_linkattr_option(action, options, eid, _):
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    if not 'linkattr' in options:
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        msg = _("'%s' action require 'linkattr' option") % action
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        raise ValidationError(eid, {rn('options', 'subject'): msg})
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class CWEntityXMLParser(datafeed.DataFeedParser):
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    """datafeed parser for the 'xml' entity view"""
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    __regid__ = 'cw.entityxml'
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   117
    action_options = {
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   118
        'copy': _check_no_option,
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parents:
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   119
        'link-or-create': _check_linkattr_option,
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parents:
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   120
        'link': _check_linkattr_option,
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parents:
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   121
        }
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parents:
diff changeset
   122
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   123
    def __init__(self, *args, **kwargs):
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parents:
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   124
        super(CWEntityXMLParser, self).__init__(*args, **kwargs)
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   125
        self.action_methods = {
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   126
            'copy': self.related_copy,
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   127
            'link-or-create': self.related_link_or_create,
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   128
            'link': self.related_link,
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parents:
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   129
            }
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   130
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   131
    # mapping handling #########################################################
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   132
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   133
    def add_schema_config(self, schemacfg, checkonly=False):
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   134
        """added CWSourceSchemaConfig, modify mapping accordingly"""
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   135
        _ = self._cw._
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   136
        try:
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   137
            rtype = schemacfg.schema.rtype.name
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   138
        except AttributeError:
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   139
            msg = _("entity and relation types can't be mapped, only attributes "
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   140
                    "or relations")
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   141
            raise ValidationError(schemacfg.eid, {rn('cw_for_schema', 'subject'): msg})
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   142
        if schemacfg.options:
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   143
            options = text_to_dict(schemacfg.options)
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   144
        else:
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   145
            options = {}
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   146
        try:
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   147
            role = options.pop('role')
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   148
            if role not in ('subject', 'object'):
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   149
                raise KeyError
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   150
        except KeyError:
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parents:
diff changeset
   151
            msg = _('"role=subject" or "role=object" must be specified in options')
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   152
            raise ValidationError(schemacfg.eid, {rn('options', 'subject'): msg})
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parents:
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   153
        try:
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   154
            action = options.pop('action')
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parents:
diff changeset
   155
            self.action_options[action](action, options, schemacfg.eid, _)
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parents:
diff changeset
   156
        except KeyError:
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parents:
diff changeset
   157
            msg = _('"action" must be specified in options; allowed values are '
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parents:
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   158
                    '%s') % ', '.join(self.action_methods)
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parents:
diff changeset
   159
            raise ValidationError(schemacfg.eid, {rn('options', 'subject'): msg})
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parents:
diff changeset
   160
        if not checkonly:
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parents:
diff changeset
   161
            if role == 'subject':
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parents:
diff changeset
   162
                etype = schemacfg.schema.stype.name
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parents:
diff changeset
   163
                ttype = schemacfg.schema.otype.name
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parents:
diff changeset
   164
            else:
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parents:
diff changeset
   165
                etype = schemacfg.schema.otype.name
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parents:
diff changeset
   166
                ttype = schemacfg.schema.stype.name
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parents:
diff changeset
   167
            etyperules = self.source.mapping.setdefault(etype, {})
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parents:
diff changeset
   168
            etyperules.setdefault((rtype, role, action), []).append(
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parents:
diff changeset
   169
                (ttype, options) )
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parents:
diff changeset
   170
            self.source.mapping_idx[schemacfg.eid] = (
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parents:
diff changeset
   171
                etype, rtype, role, action, ttype)
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parents:
diff changeset
   172
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diff changeset
   173
    def del_schema_config(self, schemacfg, checkonly=False):
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parents:
diff changeset
   174
        """deleted CWSourceSchemaConfig, modify mapping accordingly"""
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parents:
diff changeset
   175
        etype, rtype, role, action, ttype = self.source.mapping_idx[schemacfg.eid]
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parents:
diff changeset
   176
        rules = self.source.mapping[etype][(rtype, role, action)]
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parents:
diff changeset
   177
        rules = [x for x in rules if not x[0] == ttype]
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parents:
diff changeset
   178
        if not rules:
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parents:
diff changeset
   179
            del self.source.mapping[etype][(rtype, role, action)]
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parents:
diff changeset
   180
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diff changeset
   181
    # import handling ##########################################################
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parents:
diff changeset
   182
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parents:
diff changeset
   183
    def process(self, url, partialcommit=True):
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parents:
diff changeset
   184
        """IDataFeedParser main entry point"""
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parents:
diff changeset
   185
        # XXX suppression support according to source configuration. If set, get
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   186
        # all cwuri of entities from this source, and compare with newly
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parents:
diff changeset
   187
        # imported ones
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parents:
diff changeset
   188
        for item, rels in self.parse(url):
822f2530570d [datafeed] add parser to import cubicweb xml
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parents:
diff changeset
   189
            self.process_item(item, rels)
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parents:
diff changeset
   190
            if partialcommit:
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   191
                # commit+set_pool instead of commit(reset_pool=False) to let
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   192
                # other a chance to get our pool
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parents:
diff changeset
   193
                self._cw.commit()
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parents:
diff changeset
   194
                self._cw.set_pool()
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parents:
diff changeset
   195
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parents:
diff changeset
   196
    def parse(self, url):
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parents:
diff changeset
   197
        if not url.startswith('http'):
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   198
            stream = StringIO.StringIO(url)
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parents:
diff changeset
   199
        else:
6963
5774d4ba4306 [datafeed] introduce a host mapping so dev instance may transparently redirect request to another host than the actual's one
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6960
diff changeset
   200
            for mappedurl in HOST_MAPPING:
5774d4ba4306 [datafeed] introduce a host mapping so dev instance may transparently redirect request to another host than the actual's one
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6960
diff changeset
   201
                if url.startswith(mappedurl):
5774d4ba4306 [datafeed] introduce a host mapping so dev instance may transparently redirect request to another host than the actual's one
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 6960
diff changeset
   202
                    url = url.replace(mappedurl, HOST_MAPPING[mappedurl], 1)
5774d4ba4306 [datafeed] introduce a host mapping so dev instance may transparently redirect request to another host than the actual's one
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parents: 6960
diff changeset
   203
                    break
6960
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parents:
diff changeset
   204
            self.source.info('GET %s', url)
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   205
            stream = _OPENER.open(url)
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   206
        return _entity_etree(etree.parse(stream).getroot())
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   207
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parents:
diff changeset
   208
    def process_one(self, url):
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   209
        # XXX assert len(root.children) == 1
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   210
        for item, rels in self.parse(url):
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   211
            return self.process_item(item, rels)
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   212
822f2530570d [datafeed] add parser to import cubicweb xml
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parents:
diff changeset
   213
    def process_item(self, item, rels):
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   214
        entity = self.extid2entity(str(item.pop('cwuri')),
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   215
                                   item.pop('cwtype'),
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parents:
diff changeset
   216
                                   item=item)
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   217
        if not (self.created_during_pull(entity)
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   218
                or self.updated_during_pull(entity)):
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   219
            self.notify_updated(entity)
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parents:
diff changeset
   220
            item.pop('eid')
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   221
            # XXX check modification date
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   222
            attrs = extract_typed_attrs(entity.e_schema, item)
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   223
            entity.set_attributes(**attrs)
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   224
        for (rtype, role, action), rules in self.source.mapping.get(entity.__regid__, {}).iteritems():
822f2530570d [datafeed] add parser to import cubicweb xml
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parents:
diff changeset
   225
            try:
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   226
                rel = rels[role][rtype]
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   227
            except KeyError:
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   228
                self.source.error('relation %s-%s doesn\'t seem exported in %s xml',
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   229
                                  rtype, role, entity.__regid__)
822f2530570d [datafeed] add parser to import cubicweb xml
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parents:
diff changeset
   230
                continue
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   231
            try:
822f2530570d [datafeed] add parser to import cubicweb xml
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   232
                actionmethod = self.action_methods[action]
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            except KeyError:
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                raise Exception('Unknown action %s' % action)
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            actionmethod(entity, rtype, role, rel, rules)
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        return entity
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    def before_entity_copy(self, entity, sourceparams):
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        """IDataFeedParser callback"""
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        attrs = extract_typed_attrs(entity.e_schema, sourceparams['item'])
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        entity.cw_edited.update(attrs)
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    def related_copy(self, entity, rtype, role, value, rules):
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        """implementation of 'copy' action
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        Takes no option.
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        """
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        assert not any(x[1] for x in rules), "'copy' action takes no option"
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        ttypes = set([x[0] for x in rules])
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        value = [item for item in value if item['cwtype'] in ttypes]
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        eids = [] # local eids
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        if not value:
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            self._clear_relation(entity, rtype, role, ttypes)
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            return
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        for item in value:
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            eids.append(self.process_one(self._complete_url(item)).eid)
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        self._set_relation(entity, rtype, role, eids)
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    def related_link(self, entity, rtype, role, value, rules):
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        """implementation of 'link' action
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        requires an options to control search of the linked entity.
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        """
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        for ttype, options in rules:
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            assert 'linkattr' in options, (
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                "'link-or-create' action require a list of attributes used to "
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                "search if the entity already exists")
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            self._related_link(entity, rtype, role, ttype, value, [options['linkattr']],
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                               self._log_not_found)
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    def related_link_or_create(self, entity, rtype, role, value, rules):
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        """implementation of 'link-or-create' action
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        requires an options to control search of the linked entity.
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        """
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        for ttype, options in rules:
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            assert 'linkattr' in options, (
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   278
                "'link-or-create' action require a list of attributes used to "
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   279
                "search if the entity already exists")
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   280
            self._related_link(entity, rtype, role, ttype, value, [options['linkattr']],
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                               self._create_not_found)
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   282
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   283
    def _log_not_found(self, entity, rtype, role, ritem, searchvalues):
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   284
        self.source.error('can find %s entity with attributes %s',
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                          ritem['cwtype'], searchvalues)
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   286
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    def _create_not_found(self, entity, rtype, role, ritem, searchvalues):
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   288
        ensure_str_keys(searchvalues) # XXX necessary with python < 2.6
6960
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   289
        return self._cw.create_entity(ritem['cwtype'], **searchvalues).eid
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   290
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   291
    def _related_link(self, entity, rtype, role, ttype, value, searchattrs,
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   292
                      notfound_callback):
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   293
        eids = [] # local eids
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   294
        for item in value:
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   295
            if item['cwtype'] != ttype:
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   296
                continue
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diff changeset
   297
            if not all(attr in item for attr in searchattrs):
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   298
                # need to fetch related entity's xml
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   299
                ritems = list(self.parse(self._complete_url(item, False)))
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diff changeset
   300
                assert len(ritems) == 1, 'unexpected xml'
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diff changeset
   301
                ritem = ritems[0][0] # list of 2-uples
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diff changeset
   302
                assert all(attr in ritem for attr in searchattrs), \
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diff changeset
   303
                       'missing attribute, got %s expected keys %s' % (item, searchattrs)
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diff changeset
   304
            else:
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parents:
diff changeset
   305
                ritem = item
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diff changeset
   306
            kwargs = dict((attr, ritem[attr]) for attr in searchattrs)
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diff changeset
   307
            rql = build_search_rql(item['cwtype'], kwargs)
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parents:
diff changeset
   308
            rset = self._cw.execute(rql, kwargs)
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diff changeset
   309
            if rset:
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diff changeset
   310
                assert len(rset) == 1
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diff changeset
   311
                eids.append(rset[0][0])
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diff changeset
   312
            else:
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diff changeset
   313
                eid = notfound_callback(entity, rtype, role, ritem, kwargs)
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diff changeset
   314
                if eid is not None:
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diff changeset
   315
                    eids.append(eid)
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parents:
diff changeset
   316
        if not eids:
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parents:
diff changeset
   317
            self._clear_relation(entity, rtype, role, (ttype,))
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parents:
diff changeset
   318
        else:
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parents:
diff changeset
   319
            self._set_relation(entity, rtype, role, eids)
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parents:
diff changeset
   320
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parents:
diff changeset
   321
    def _complete_url(self, item, add_relations=True):
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parents:
diff changeset
   322
        itemurl = item['cwuri'] + '?vid=xml'
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parents:
diff changeset
   323
        for rtype, role, _ in self.source.mapping.get(item['cwtype'], ()):
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parents:
diff changeset
   324
            itemurl += '&relation=%s_%s' % (rtype, role)
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parents:
diff changeset
   325
        return itemurl
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parents:
diff changeset
   326
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parents:
diff changeset
   327
    def _clear_relation(self, entity, rtype, role, ttypes):
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parents:
diff changeset
   328
        if entity.eid not in self.stats['created']:
822f2530570d [datafeed] add parser to import cubicweb xml
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parents:
diff changeset
   329
            if len(ttypes) > 1:
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parents:
diff changeset
   330
                typerestr = ', Y is IN(%s)' % ','.join(ttypes)
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parents:
diff changeset
   331
            else:
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parents:
diff changeset
   332
                typerestr = ', Y is %s' % ','.join(ttypes)
822f2530570d [datafeed] add parser to import cubicweb xml
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parents:
diff changeset
   333
            self._cw.execute('DELETE ' + rtype_role_rql(rtype, role) + typerestr,
822f2530570d [datafeed] add parser to import cubicweb xml
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parents:
diff changeset
   334
                             {'x': entity.eid})
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parents:
diff changeset
   335
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parents:
diff changeset
   336
    def _set_relation(self, entity, rtype, role, eids):
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parents:
diff changeset
   337
        eidstr = ','.join(str(eid) for eid in eids)
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parents:
diff changeset
   338
        rql = rtype_role_rql(rtype, role)
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parents:
diff changeset
   339
        self._cw.execute('DELETE %s, NOT Y eid IN (%s)' % (rql, eidstr),
822f2530570d [datafeed] add parser to import cubicweb xml
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parents:
diff changeset
   340
                         {'x': entity.eid})
822f2530570d [datafeed] add parser to import cubicweb xml
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parents:
diff changeset
   341
        if role == 'object':
822f2530570d [datafeed] add parser to import cubicweb xml
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parents:
diff changeset
   342
            rql = 'SET %s, Y eid IN (%s), NOT Y %s X' % (rql, eidstr, rtype)
822f2530570d [datafeed] add parser to import cubicweb xml
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parents:
diff changeset
   343
        else:
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parents:
diff changeset
   344
            rql = 'SET %s, Y eid IN (%s), NOT X %s Y' % (rql, eidstr, rtype)
822f2530570d [datafeed] add parser to import cubicweb xml
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parents:
diff changeset
   345
        self._cw.execute(rql, {'x': entity.eid})
6963
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parents: 6960
diff changeset
   346
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def registration_callback(vreg):
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    vreg.register_all(globals().values(), __name__)
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    global HOST_MAPPING
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    HOST_MAPPING = {}
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    if vreg.config.apphome:
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        host_mapping_file = osp.join(vreg.config.apphome, 'hostmapping.py')
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        if osp.exists(host_mapping_file):
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            HOST_MAPPING = eval(file(host_mapping_file).read())
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            vreg.info('using host mapping %s from %s', HOST_MAPPING, host_mapping_file)