PropertyProxy.py

Go to the documentation of this file.

 
 
# data ---------------------------------------------------------------------
__all__ = ["PropertyProxy", "GaudiHandlePropertyProxy", "GaudiHandleArrayPropertyProxy"]
 
import logging
import os
 
from GaudiKernel.DataHandle import DataHandle
from GaudiKernel.GaudiHandles import GaudiHandle, GaudiHandleArray
 
from GaudiKernel import ConfigurableDb
 
log = logging.getLogger("PropertyProxy")
 
 
def derives_from(derived, base):
    """A string version of isinstance().
    <derived> is either an object instance, or a type
    <base>    is a string containing the name of the base class (or <derived> class)"""
    if not isinstance(derived, type):
        derived = type(derived)
    if derived.__name__ == base:
        return True
    for b in derived.__bases__:
        if derives_from(b, base):
            return True
 
    return False
 
 
def _isCompatible(tp, value):
    errmsg = "received an instance of %s, but %s expected" % (type(value), tp)
 
    if derives_from(value, "PropertyReference"):
        # TODO: implement type checking for references
        return value  # references are valid
    if tp is str:
        if (type(value) is str) or derives_from(value, "Configurable"):
            # we can set string properties only from strings or configurables
            return value
        elif isinstance(value, DataHandle):
            # Implicitly convert DataHandle to str for backward
            # compatiblity in cases like B.Input (str) = A.Output (handle)
            return str(value)
        else:
            raise ValueError(errmsg)
    elif tp in [list, tuple, dict]:
        if type(value) is tp:
            # We need to check that the types match for lists, tuples and
            # dictionaries (bug #34769).
            return value
        else:
            raise ValueError(errmsg)
    elif derives_from(tp, "Configurable"):
        return value
    else:
        # all other types: accept if conversion allowed
        try:
            dummy = tp(value)
        except (TypeError, ValueError):
            raise ValueError(errmsg)
 
    return dummy  # in case of e.g. classes with __int__, __iter__, etc. implemented
 
 
class PropertyProxy(object):
    def __init__(self, descr, docString=None, default=None):
        self.history = {}
        self.descr = descr
        self.deprecated = False
        if docString:
            self.__doc__ = docString
            if "[[deprecated]]" in docString:
                self.deprecated = True
        if default is not None:
            self.default = default
 
    def setDefault(self, value):
        self.__default = value
 
    def getDefault(self):
        return self.__default
 
    default = property(getDefault, setDefault)
 
    def fullPropertyName(self, obj):
        return (obj.getJobOptName() or obj.getName()) + "." + self.descr.__name__
 
    def __get__(self, obj, type=None):
        try:
            return self.descr.__get__(obj, type)
        except AttributeError:
            # special case for lists and dictionaries:
            # allow default to work with on += and []
            if self.__default.__class__ in [list, dict]:
                self.descr.__set__(obj, self.__default.__class__(self.__default))
                return self.descr.__get__(obj, type)
            else:
                # for non lists (or dicts) return a reference to the default
                # return self.__default
                raise
 
    def __set__(self, obj, value):
        # check if deprecated
        if self.deprecated and not obj._unpickling:
            log.warning(
                "Property %s is deprecated: %s",
                self.fullPropertyName(obj),
                self.__doc__,
            )
 
        # check value/property compatibility if possible
        proptype, allowcompat = None, False
        if hasattr(self, "default"):
            proptype = type(self.default)
            if self.descr.__name__ == "OutputLevel":  # old-style compat for Btag
                allowcompat = True
        elif obj in self.history:
            proptype = type(self.history[obj][0])
            allowcompat = True
 
        # check if type known; allow special initializer for typed instances
        # Do not perform the check for PropertyReference, should be delayed until
        # binding (if ever done)
        if (
            proptype
            and not isinstance(None, proptype)
            and not derives_from(value, "PropertyReference")
        ):
            try:
                # check value itself
                value = _isCompatible(proptype, value)
 
                # check element in case of list
                if proptype == list:
                    try:
                        oldvec = self.descr.__get__(obj, type)
                        if oldvec:
                            tpo = type(oldvec[0])
                            for v in value:
                                _isCompatible(tpo, v)
                    except AttributeError:
                        # value not yet set
                        pass
            except ValueError as e:
                if allowcompat:
                    log.error(
                        "inconsistent value types for %s.%s (%s)"
                        % (obj.getName(), self.descr.__name__, str(e))
                    )
                else:
                    raise
 
        # allow a property to be set if we're in non-default mode, or if it
        # simply hasn't been set before
        if not obj._isInSetDefaults() or obj not in self.history:
            # by convention, 'None' for default is used to designate objects setting
            if hasattr(self, "default") and self.default is None:
                obj.__iadd__(value, self.descr)  # to establish hierarchy
            else:
                self.descr.__set__(obj, value)
            self.history.setdefault(obj, []).append(value)
 
    def __delete__(self, obj):
        if obj in self.history:
            del self.history[obj]
        self.descr.__delete__(obj)
 
 
class GaudiHandlePropertyProxyBase(PropertyProxy):
    """A class with some utilities for GaudiHandles and GaudiHandleArrays"""
 
    def __init__(self, descr, docString, default, handleType, allowedType):
        """<descr>: the real property in the object instance (from __slots__)
        <docString>: the documentation string of this property
        <default>: default value from C++ (via python generated by genconf)
        <handleType>: real python handle type (e.g. PublicToolHandle, PrivateToolHandle, ...)
        <allowedType>: allowed instance type for default
        """
        # check that default is of allowed type for this proxy
        if not isinstance(default, allowedType):
            raise TypeError(
                "%s: %s default: %r is not a %s"
                % (
                    descr.__name__,
                    self.__class__.__name__,
                    default,
                    allowedType.__name__,
                )
            )
        PropertyProxy.__init__(self, descr, docString, default)
        self._handleType = handleType
        self._confTypeName = "Configurable" + handleType.componentType
 
    #      print "%s: %r (%s)" % (self.__class__.__name__,self._handleType,self._confTypeName)
 
    def __get__(self, obj, type=None):
        try:
            return self.descr.__get__(obj, type)
        except AttributeError:
            # Get default
            try:
                default = obj.__class__.getDefaultProperty(self.descr.__name__)
                default = self.convertDefaultToBeSet(obj, default)
                if default:
                    self.__set__(obj, default)
            except AttributeError as e:
                # change type of exception to avoid false error message
                raise RuntimeError(*e.args)
 
        return self.descr.__get__(obj, type)
 
    def __set__(self, obj, value):
        # allow a property to be set if we're in non-default mode, or if it
        # simply hasn't been set before
        if not obj._isInSetDefaults() or obj not in self.history:
            value = self.convertValueToBeSet(obj, value)
            # assign the value
            self.descr.__set__(obj, value)
            log.debug("Setting %s = %r", self.fullPropertyName(obj), value)
            self.history.setdefault(obj, []).append(value)
 
    def isHandle(self, value):
        """Check if <value> is a handle of the correct type"""
        return isinstance(value, self._handleType)
 
    def isConfig(self, value):
        """Check if <value> is a configurable of the correct type"""
        return derives_from(value, self._confTypeName)
 
    def getDefaultConfigurable(self, typeAndName, requester):
        """Return the configurable instance corresponding to the toolhandle if possible.
        Otherwise return None"""
        global log
        # find the module
        typeAndNameTuple = typeAndName.split("/")
        confType = typeAndNameTuple[0]
        confClass = ConfigurableDb.getConfigurable(confType)
        # check the type of the configurable
        if not derives_from(confClass, self._confTypeName):
            log.error(
                "%s: Configurable %s is not a %s",
                requester,
                confType,
                self._confTypeName,
            )
            return None
        try:
            confName = typeAndNameTuple[1]
        except IndexError:
            return confClass()  # use default name
        else:
            return confClass(confName)
 
    def convertDefaultToBeSet(self, obj, default):
        # turn string into handle
        isString = type(default) == str
        if not isString and self.isConfig(default):
            #         print self.fullPropertyName(obj) + ": Setting default configurable: %r" % default
            return default
        elif isString or self.isHandle(default):
            if isString:
                # convert string into handle
                typeAndName = default
                default = self._handleType(typeAndName)
            else:
                typeAndName = default.typeAndName
            if not self._handleType.isPublic:
                if not typeAndName:
                    return None
                # Find corresponding default configurable of private handles
                # (make sure the name used to instantiate the private tool
                # includes the name of the owner, see https://gitlab.cern.ch/gaudi/Gaudi/-/issues/141)
                if "/" in typeAndName:
                    typeAndName = typeAndName.replace("/", "/{}.".format(obj.name()), 1)
                else:
                    typeAndName = "{0}/{1}.{0}".format(typeAndName, obj.name())
                try:
                    conf = self.getDefaultConfigurable(
                        typeAndName, self.fullPropertyName(obj)
                    )
 
                #               print self.fullPropertyName(obj) + ": Setting default private configurable (from default handle): %r" % conf
                except AttributeError as e:
                    # change type of exception to avoid false error message
                    raise RuntimeError(*e.args)
                if conf is None:
                    raise RuntimeError(
                        "%s: Default configurable for class %s not found in ConfigurableDb.CfgDb"
                        % (self.fullPropertyName(obj), default.getType())
                    )
                return conf
        else:  # not a config, not a handle, not a string
            raise TypeError(
                "%s: default value %r is not of type %s or %s"
                % (
                    self.fullPropertyName(obj),
                    default,
                    self._confTypeName,
                    self._handleType.__name__,
                )
            )
 
        return default
 
    def convertValueToBeSet(self, obj, value):
        if value is None:
            value = ""
        isString = type(value) == str
        if isString:
            # create an new handle
            return self._handleType(value)
        elif self.isHandle(value):
            # make a copy of the handle
            return self._handleType(value.toStringProperty())
        elif self.isConfig(value):
            if self._handleType.isPublic:
                # A public tool must be registered to ToolSvc before assigning it
                if derives_from(value, "ConfigurableAlgTool"):
                    if not value.isInToolSvc():
                        suggestion = (
                            "You may need to add jobOptions lines something like:"
                            + os.linesep
                            + "from AthenaCommon.AppMgr import ToolSvc"
                            + os.linesep
                            + "ToolSvc += "
                        )
                        if value.getName() == value.getType():  # using default name
                            suggestion += "%s()" % value.__class__.__name__
                        else:  # using user-defined name
                            suggestion += "%s(%r)" % (
                                value.__class__.__name__,
                                value.getName(),
                            )
                        raise RuntimeError(
                            self.fullPropertyName(obj)
                            + ": Public tool %s is not yet in ToolSvc. %s"
                            % (value.getJobOptName(), suggestion)
                        )
                # make it read-only
                return self._handleType(value.toStringProperty())
            elif value.hasParent(obj.getJobOptName()):
                # is already a child, keep as-is
                return value
            else:
                # make a copy of the configurable
                value = obj.copyChildAndSetParent(value, obj.getJobOptName())
                # ensure that the new object is in allConfigurables
                obj.allConfigurables[value.name()] = value
                return value
        else:
            raise TypeError(
                "Property %s value %r is not a %s nor a %s nor a string"
                % (
                    self.fullPropertyName(obj),
                    value,
                    self._confTypeName,
                    self._handleType.__name__,
                )
            )
 
        return value
 
 
class GaudiHandlePropertyProxy(GaudiHandlePropertyProxyBase):
    def __init__(self, descr, docString, default):
        GaudiHandlePropertyProxyBase.__init__(
            self, descr, docString, default, type(default), GaudiHandle
        )
 
 
class GaudiHandleArrayPropertyProxy(GaudiHandlePropertyProxyBase):
    def __init__(self, descr, docString, default):
        """<descr>: the real property in the object instance (from __slots__)
        <confTypeName>: string indicating the (base) class of allowed Configurables to be assigned.
        <handleType>: real python handle type (e.g. PublicToolHandle, PrivateToolHandle, ...)
        """
        GaudiHandlePropertyProxyBase.__init__(
            self, descr, docString, default, type(default).handleType, GaudiHandleArray
        )
        self.arrayType = type(default)
 
    def checkType(self, obj, value):
        if not isinstance(value, list) and not isinstance(value, self.arrayType):
            raise TypeError(
                "%s: Value %r is not a list nor a %s"
                % (self.fullPropertyName(obj), value, self.arrayType.__name__)
            )
 
    def convertDefaultToBeSet(self, obj, default):
        self.checkType(obj, default)
        newDefault = self.arrayType()
        for d in default:
            cd = GaudiHandlePropertyProxyBase.convertDefaultToBeSet(self, obj, d)
            if cd:
                newDefault.append(cd)
 
        return newDefault
 
    def convertValueToBeSet(self, obj, value):
        self.checkType(obj, value)
        newValue = self.arrayType()
        for v in value:
            cv = GaudiHandlePropertyProxyBase.convertValueToBeSet(self, obj, v)
            if cv:
                newValue.append(cv)
 
        return newValue
 
 
class DataHandlePropertyProxy(PropertyProxy):
    def __init__(self, descr, docString, default):
        PropertyProxy.__init__(self, descr, docString, default)
 
    def __get__(self, obj, type=None):
        try:
            return self.descr.__get__(obj, type)
        except AttributeError:
            # Get default
            try:
                default = obj.__class__.getDefaultProperty(self.descr.__name__)
                default = self.convertValueToBeSet(obj, default)
                if default:
                    self.__set__(obj, default)
            except AttributeError as e:
                # change type of exception to avoid false error message
                raise RuntimeError(*e.args)
 
        return self.descr.__get__(obj, type)
 
    def __set__(self, obj, value):
        if not obj._isInSetDefaults() or obj not in self.history:
            value = self.convertValueToBeSet(obj, value)
            # assign the value
            self.descr.__set__(obj, value)
            log.debug("Setting %s = %r", self.fullPropertyName(obj), value)
            self.history.setdefault(obj, []).append(value)
 
    def convertValueToBeSet(self, obj, value):
        if value is None:
            value = ""
 
        mode = obj.__class__.getDefaultProperty(self.descr.__name__).mode()
        _type = obj.__class__.getDefaultProperty(self.descr.__name__).type()
        if type(value) == str:
            return DataHandle(value, mode, _type)
        elif isinstance(value, DataHandle):
            return DataHandle(value.__str__(), mode, _type)
        else:
            raise ValueError(
                "received an instance of %s, but %s expected"
                % (type(value), "str or DataHandle")
            )
 
 
def PropertyProxyFactory(descr, doc, default):
    #   print "PropertyProxyFactory( %s, %r )" % (descr.__name__,default)
 
    if isinstance(default, GaudiHandleArray):
        return GaudiHandleArrayPropertyProxy(descr, doc, default)
 
    if isinstance(default, GaudiHandle):
        return GaudiHandlePropertyProxy(descr, doc, default)
 
    if isinstance(default, DataHandle):
        return DataHandlePropertyProxy(descr, doc, default)
 
    return PropertyProxy(descr, doc, default)