__init__.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Tue, 08 Dec 2009 12:01:38 +0100
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"""CubicWeb is a generic framework to quickly build applications which describes
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relations between entitites.
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:organization: Logilab
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:copyright: 2001-2009 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: Library General Public License version 2 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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import __builtin__
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# '_' is available in builtins to mark internationalized string but should
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# not be used to do the actual translation
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if not hasattr(__builtin__, '_'):
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    __builtin__._ = unicode
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CW_SOFTWARE_ROOT = __path__[0]
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import sys, os, logging
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from StringIO import StringIO
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from logilab.common.logging_ext import set_log_methods
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if os.environ.get('APYCOT_ROOT'):
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    logging.basicConfig(level=logging.CRITICAL)
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else:
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    logging.basicConfig()
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from cubicweb.__pkginfo__ import version as __version__
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set_log_methods(sys.modules[__name__], logging.getLogger('cubicweb'))
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# make all exceptions accessible from the package
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from cubicweb._exceptions import *
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# convert eid to the right type, raise ValueError if it's not a valid eid
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typed_eid = int
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#def log_thread(f, w, a):
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#    print f.f_code.co_filename, f.f_code.co_name
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#import threading
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#threading.settrace(log_thread)
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class Binary(StringIO):
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    """customize StringIO to make sure we don't use unicode"""
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    def __init__(self, buf=''):
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        assert isinstance(buf, (str, buffer)), \
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               "Binary objects must use raw strings, not %s" % buf.__class__
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        StringIO.__init__(self, buf)
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    def write(self, data):
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        assert isinstance(data, (str, buffer)), \
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               "Binary objects must use raw strings, not %s" % data.__class__
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        StringIO.write(self, data)
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# use this dictionary for renaming of entity types while keeping bw compat
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ETYPE_NAME_MAP = {# 3.2 migration
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                  'ECache': 'CWCache',
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                  'EUser': 'CWUser',
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                  'EGroup': 'CWGroup',
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                  'EProperty': 'CWProperty',
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                  'EFRDef': 'CWAttribute',
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                  'ENFRDef': 'CWRelation',
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                  'ERType': 'CWRType',
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                  'EEType': 'CWEType',
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                  'EConstraintType': 'CWConstraintType',
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                  'EConstraint': 'CWConstraint',
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                  'EPermission': 'CWPermission',
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                  }
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# XXX cubic web cube migration map
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CW_MIGRATION_MAP = {'erudi': 'cubicweb',
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                    'eaddressbook': 'addressbook',
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                    'ebasket': 'basket',
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                    'eblog': 'blog',
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                    'ebook': 'book',
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                    'eclassschemes': 'keyword',
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                    'eclassfolders': 'folder',
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                    'eclasstags': 'tag',
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                    'ecomment': 'comment',
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                    'ecompany': 'company',
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                    'econference':  'conference',
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                    'eemail': 'email',
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                    'eevent': 'event',
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                    'eexpense': 'expense',
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                    'efile': 'file',
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                    'einvoice': 'invoice',
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                    'elink': 'link',
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                    'emailinglist': 'mailinglist',
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                    'eperson': 'person',
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                    'eshopcart': 'shopcart',
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                    'eskillmat': 'skillmat',
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                    'etask': 'task',
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                    'eworkcase': 'workcase',
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                    'eworkorder': 'workorder',
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                    'ezone': 'zone',
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                    'i18ncontent': 'i18ncontent',
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                    'svnfile': 'vcsfile',
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                    }
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def neg_role(role):
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    if role == 'subject':
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        return 'object'
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    return 'subject'
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def role(obj):
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    try:
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        return obj.role
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    except AttributeError:
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        return neg_role(obj.target)
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def target(obj):
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    try:
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        return obj.target
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    except AttributeError:
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        return neg_role(obj.role)
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class CubicWebEventManager(object):
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    """simple event / callback manager.
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    Typical usage to register a callback::
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      >>> from cubicweb import CW_EVENT_MANAGER
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      >>> CW_EVENT_MANAGER.bind('after-registry-reload', mycallback)
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    Typical usage to emit an event::
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      >>> from cubicweb import CW_EVENT_MANAGER
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      >>> CW_EVENT_MANAGER.emit('after-registry-reload')
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    emit() accepts an additional context parameter that will be passed
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    to the callback if specified (and only in that case)
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    """
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    def __init__(self):
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        self.callbacks = {}
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    def bind(self, event, callback, *args, **kwargs):
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        self.callbacks.setdefault(event, []).append( (callback, args, kwargs) )
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    def emit(self, event, context=None):
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        for callback, args, kwargs in self.callbacks.get(event, ()):
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            if context is None:
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                callback(*args, **kwargs)
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            else:
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                callback(context, *args, **kwargs)
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CW_EVENT_MANAGER = CubicWebEventManager()
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def onevent(event):
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    """decorator to ease event / callback binding
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    >>> from cubicweb import onevent
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    >>> @onevent('before-registry-reload')
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    ... def mycallback():
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    ...     print 'hello'
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    ...
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    >>>
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    """
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    def _decorator(func):
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        CW_EVENT_MANAGER.bind(event, func)
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        return func
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    return _decorator