Markus Zolliker
f06fa9faa2
as module properties and parameters anyway share the same namespace, there is no need to distinguish in config files. + a parameter default value may be overriden just with a class attribute. Both improvements help to switch between parameters and properties more easily. Change-Id: Ieb5cf3121f37c7c04e63345d3e95dfaf42726455 Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/22054 Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de> Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>
235 lines
10 KiB
Python
235 lines
10 KiB
Python
# -*- coding: utf-8 -*-
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# *****************************************************************************
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#
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# This program 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 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 General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Module authors:
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# Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
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#
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# *****************************************************************************
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"""Define Metaclass for Modules/Features"""
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import time
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from collections import OrderedDict
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from secop.errors import ProgrammingError, BadValueError
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from secop.params import Command, Override, Parameter
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from secop.datatypes import EnumType
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from secop.properties import PropertyMeta
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EVENT_ONLY_ON_CHANGED_VALUES = False
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class Done:
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"""a special return value for a read/write function
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indicating that the setter is triggered already"""
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# warning: MAGIC!
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class ModuleMeta(PropertyMeta):
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"""Metaclass
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joining the class's properties, parameters and commands dicts with
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those of base classes.
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also creates getters/setter for parameter access
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and wraps read_*/write_* methods
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(so the dispatcher will get notfied of changed values)
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"""
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def __new__(cls, name, bases, attrs):
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commands = attrs.pop('commands', {})
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parameters = attrs.pop('parameters', {})
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overrides = attrs.pop('overrides', {})
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newtype = type.__new__(cls, name, bases, attrs)
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if '__constructed__' in attrs:
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return newtype
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newtype = PropertyMeta.__join_properties__(newtype, name, bases, attrs)
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# merge accessibles from all sub-classes, treat overrides
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# for now, allow to use also the old syntax (parameters/commands dict)
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accessibles_list = []
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for base in reversed(bases):
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if hasattr(base, "accessibles"):
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accessibles_list.append(base.accessibles)
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for accessibles in [parameters, commands, overrides]:
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accessibles_list.append(accessibles)
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accessibles = {} # unordered dict of accessibles, will be sorted later
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for accessibles_dict in accessibles_list:
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for key, obj in accessibles_dict.items():
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if isinstance(obj, Override):
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if key not in accessibles:
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raise ProgrammingError("module %s: can not apply Override on %s: no such accessible!"
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% (name, key))
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obj = obj.apply(accessibles[key])
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accessibles[key] = obj
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else:
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if key in accessibles:
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# for now, accept redefinitions:
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print("WARNING: module %s: %s should not be redefined"
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% (name, key))
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# raise ProgrammingError("module %s: %s must not be redefined"
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# % (name, key))
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if isinstance(obj, Parameter):
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accessibles[key] = obj
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elif isinstance(obj, Command):
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# XXX: convert to param with datatype=CommandType???
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accessibles[key] = obj
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else:
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raise ProgrammingError('%r: accessibles entry %r should be a '
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'Parameter or Command object!' % (name, key))
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# Correct naming of EnumTypes
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for k, v in accessibles.items():
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if isinstance(v, Parameter) and isinstance(v.datatype, EnumType):
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v.datatype._enum.name = k
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# newtype.accessibles will be used in 2 places only:
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# 1) for inheritance (see above)
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# 2) for the describing message
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newtype.accessibles = OrderedDict(sorted(accessibles.items(), key=lambda item: item[1].ctr))
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# check for attributes overriding parameter values
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for pname, pobj in newtype.accessibles.items():
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if pname in attrs:
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try:
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value = pobj.datatype(attrs[pname])
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except BadValueError:
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raise ProgrammingError('parameter %s can not be set to %r'
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% (pname, attrs[pname]))
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newtype.accessibles[pname] = Override(default=value).apply(pobj)
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# check validity of Parameter entries
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for pname, pobj in newtype.accessibles.items():
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# XXX: create getters for the units of params ??
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# wrap of reading/writing funcs
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if isinstance(pobj, Command):
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# skip commands for now
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continue
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rfunc = attrs.get('read_' + pname, None)
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rfunc_handler = pobj.handler.get_read_func(newtype, pname) if pobj.handler else None
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if rfunc_handler:
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if rfunc:
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raise ProgrammingError("parameter '%s' can not have a handler "
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"and read_%s" % (pname, pname))
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rfunc = rfunc_handler
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else:
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for base in bases:
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if rfunc is not None:
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break
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rfunc = getattr(base, 'read_' + pname, None)
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if rfunc is None or getattr(rfunc, '__wrapped__', False) is False:
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def wrapped_rfunc(self, pname=pname, rfunc=rfunc):
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if rfunc:
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self.log.debug("calling %r" % rfunc)
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try:
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value = rfunc(self)
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self.log.debug("rfunc(%s) returned %r" % (pname, value))
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if value is Done: # the setter is already triggered
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return getattr(self, pname)
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except Exception as e:
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self.log.debug("rfunc(%s) failed %r" % (pname, e))
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self.setError(pname, e)
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raise
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else:
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# return cached value
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self.log.debug("rfunc(%s): return cached value" % pname)
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value = self.accessibles[pname].value
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setattr(self, pname, value) # important! trigger the setter
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return value
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wrapped_rfunc.__doc__ = rfunc.__doc__
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setattr(newtype, 'read_' + pname, wrapped_rfunc)
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wrapped_rfunc.__wrapped__ = True
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if not pobj.readonly:
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wfunc = attrs.get('write_' + pname, None)
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# if a handler and write_<param> is present, wfunc will be called
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# by the handler first
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wfunc = pobj.handler.get_write_func(pname, wfunc) if pobj.handler else wfunc
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for base in bases:
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if wfunc is not None:
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break
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wfunc = getattr(base, 'write_' + pname, None)
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if wfunc is None or getattr(wfunc, '__wrapped__', False) is False:
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def wrapped_wfunc(self, value, pname=pname, wfunc=wfunc):
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self.log.debug("check validity of %s = %r" % (pname, value))
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pobj = self.accessibles[pname]
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value = pobj.datatype(value)
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if wfunc:
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self.log.debug('calling %r(%r)' % (wfunc, value))
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returned_value = wfunc(self, value)
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if returned_value is Done: # the setter is already triggered
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return getattr(self, pname)
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if returned_value is not None:
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value = returned_value
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setattr(self, pname, value)
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return value
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wrapped_wfunc.__doc__ = wfunc.__doc__
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setattr(newtype, 'write_' + pname, wrapped_wfunc)
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wrapped_wfunc.__wrapped__ = True
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def getter(self, pname=pname):
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return self.accessibles[pname].value
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def setter(self, value, pname=pname):
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pobj = self.accessibles[pname]
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value = pobj.datatype(value)
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pobj.timestamp = time.time()
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if (not EVENT_ONLY_ON_CHANGED_VALUES) or (value != pobj.value):
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pobj.value = value
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# also send notification
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if pobj.export:
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self.log.debug('%s is now %r' % (pname, value))
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self.DISPATCHER.announce_update(self, pname, pobj)
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setattr(newtype, pname, property(getter, setter))
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# check information about Command's
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for attrname in attrs:
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if attrname.startswith('do_'):
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if attrname[3:] not in newtype.accessibles:
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raise ProgrammingError('%r: command %r has to be specified '
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'explicitly!' % (name, attrname[3:]))
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attrs['__constructed__'] = True
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return newtype
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@property
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def configurables(cls):
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# note: this ends up as an property of the Module class (not on the instance)!
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# dict of properties with Property and Parameter with dict of properties
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res = {}
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# collect info about properties
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for pn, pv in cls.properties.items():
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if pv.settable:
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res[pn] = pv
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# collect info about parameters and their properties
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for param, pobj in cls.accessibles.items():
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res[param] = {}
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for pn, pv in pobj.getProperties().items():
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if pv.settable:
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res[param][pn] = pv
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return res
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