goa/__init__.py
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Tue, 03 Mar 2009 18:44:19 +0100
changeset 1002 9a8db0c59971
parent 447 0e52d72104a6
child 1131 544609e83317
permissions -rw-r--r--
[i18n] duplicate entry in es.po : makes i18ncompile fail
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"""cubicweb on google appengine
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:organization: Logilab
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:copyright: 2001-2008 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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__docformat__ = "restructuredtext en"
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from datetime import datetime, time, date
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from mx.DateTime import DateTime, Date, Time
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def mx2datetime(mxobj, yamstype):
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    """converts a mx date object (DateTime, Date or Time) into a
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    regular python datetime object
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    """
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    #if yamstype == 'Datetime':
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    # don't use date, db model doesn't actually support it, only datetime
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    return datetime(mxobj.year, mxobj.month, mxobj.day,
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                    mxobj.hour, mxobj.minute, int(mxobj.second))
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#     elif yamstype == 'Date':
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#         return date(mxobj.year, mxobj.month, mxobj.day)
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#     # XXX don't support time either, what should we do here ?
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#     return time(mxobj.hour, mxobj.minute, int(mxobj.second))
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def datetime2mx(datetimeobj, yamstype=None):
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    """converts a mx date object (DateTime, Date or Time) into a
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    regular python datetime object
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    """
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    if yamstype is None:
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        yamstype = guess_yamstype_for_date(datetimeobj)
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    assert yamstype is not None
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    if yamstype == 'Datetime':
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        # don't use date, db model doesn't actually support it, only datetime
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        return DateTime(datetimeobj.year, datetimeobj.month, datetimeobj.day,
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                        datetimeobj.hour, datetimeobj.minute, int(datetimeobj.second))
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    elif yamstype == 'Date':
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        return Date(datetimeobj.year, datetimeobj.month, datetimeobj.day)
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    # XXX don't support time either, what should we do here ?
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    return Time(datetimeobj.hour, datetimeobj.minute, int(datetimeobj.second))
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def guess_yamstype_for_date(datetimeobj):
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    """guesses yams correct type according to `datetimeobj`'s type"""
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    if isinstance(datetimeobj, datetime):
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        return 'Datetime'
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    elif isinstance(datetimeobj, date):
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        return 'Date'
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    elif isinstance(datetimeobj, time):
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        return 'Time'
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    return None
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def use_mx_for_dates(func):
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    """decorator to convert func's return value into mx objects
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    instead of datetime objects
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    """
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    def wrapper(*args, **kwargs):
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        value = func(*args, **kwargs)
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        yamstype = guess_yamstype_for_date(value)
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        if yamstype is None:
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            return value
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        return datetime2mx(value, yamstype)
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    return wrapper
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try:
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    # WARNING: do not import the google's db module here since it will take
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    #          precedence over our own db submodule
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    from google.appengine.api.datastore import Key, Get, Query
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    from google.appengine.api.datastore_errors import BadKeyError
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except ImportError:
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    # not in google app environment
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    pass
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else:
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    import os    
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    _SS = os.environ.get('SERVER_SOFTWARE')
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    if _SS is None:
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        MODE = 'test'
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    elif _SS.startswith('Dev'):
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        MODE = 'dev'
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    else:
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        MODE = 'prod'
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    from cubicweb.server import SOURCE_TYPES
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    from cubicweb.goa.gaesource import GAESource
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    SOURCE_TYPES['gae'] = GAESource
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    def do_monkey_patch():
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        # monkey patch yams Bytes validator since it should take a bytes string with gae
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        # and not a StringIO
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        def check_bytes(eschema, value):
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            """check value is a bytes string"""
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            return isinstance(value, str)
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        from yams import constraints
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        constraints.BASE_CHECKERS['Bytes'] = check_bytes
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        def rql_for_eid(eid):
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            return 'Any X WHERE X eid "%s"' % eid
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        from cubicweb.common import uilib
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        uilib.rql_for_eid = rql_for_eid
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        def typed_eid(eid):
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            try:
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                return str(Key(eid))
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            except BadKeyError:
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                raise ValueError(eid)
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        import cubicweb
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        cubicweb.typed_eid = typed_eid
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        # XXX monkey patch cubicweb.schema.CubicWebSchema to have string eid with
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        #     optional cardinality (since eid is set after the validation)
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        import re
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        from yams import buildobjs as ybo
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        def add_entity_type(self, edef):
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            edef.name = edef.name.encode()
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            assert re.match(r'[A-Z][A-Za-z0-9]*[a-z]+[0-9]*$', edef.name), repr(edef.name)
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            eschema = super(CubicWebSchema, self).add_entity_type(edef)
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            if not eschema.is_final():
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                # automatically add the eid relation to non final entity types 
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                rdef = ybo.RelationDefinition(eschema.type, 'eid', 'Bytes',
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                                              cardinality='?1', uid=True)
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                self.add_relation_def(rdef)
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                rdef = ybo.RelationDefinition(eschema.type, 'identity', eschema.type)
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                self.add_relation_def(rdef)
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            self._eid_index[eschema.eid] = eschema
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            return eschema
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        from cubicweb.schema import CubicWebSchema
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        CubicWebSchema.add_entity_type = add_entity_type
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        # don't reset vreg on repository set_schema
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        from cubicweb.server import repository
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        orig_set_schema = repository.Repository.set_schema
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        def set_schema(self, schema, resetvreg=True):
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            orig_set_schema(self, schema, False)
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        repository.Repository.set_schema = set_schema
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        # deactivate function ensuring relation cardinality consistency
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        repository.del_existing_rel_if_needed = lambda *args: None
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        def get_cubes(self):
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            """return the list of top level cubes used by this instance"""
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            config = self.config
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            cubes = config['included-cubes'] + config['included-yams-cubes']
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            return config.expand_cubes(cubes)
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        repository.Repository.get_cubes = get_cubes
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        from rql import RQLHelper
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        RQLHelper.simplify = lambda x,r: None
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        # activate entity caching on the server side
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        def set_entity_cache(self, entity):
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            self._query_data.setdefault('_eid_cache', {})[entity.eid] = entity
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        def entity_cache(self, eid):
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            return self._query_data['_eid_cache'][eid]
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        def drop_entity_cache(self, eid=None):
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            if eid is None:
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                self._query_data['_eid_cache'] = {}
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            elif '_eid_cache' in self._query_data:
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                self._query_data['_eid_cache'].pop(eid, None)
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        def datastore_get(self, key):
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            if isinstance(key, basestring):
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                key = Key(key)
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            try:
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                gentity = self._query_data['_key_cache'][key]
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                #self.critical('cached %s', gentity)
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            except KeyError:
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                gentity = Get(key)
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                #self.critical('Get %s', gentity)
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                self._query_data.setdefault('_key_cache', {})[key] = gentity
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            return gentity
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        def clear_datastore_cache(self, key=None):
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            if key is None:
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                self._query_data['_key_cache'] = {}
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            else:
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                if isinstance(key, basestring):
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                    key = Key(key)
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                self._query_data['_key_cache'].pop(key, None)
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        from cubicweb.server.session import Session
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        Session.set_entity_cache = set_entity_cache
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        Session.entity_cache = entity_cache
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        Session.drop_entity_cache = drop_entity_cache
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        Session.datastore_get = datastore_get
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        Session.clear_datastore_cache = clear_datastore_cache
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        from docutils.frontend import OptionParser
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        # avoid a call to expanduser which is not available under gae
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        def get_standard_config_files(self):
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            return self.standard_config_files
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        OptionParser.get_standard_config_files = get_standard_config_files