/usr/lib/python2.7/dist-packages/tango/client.py is in python-tango 9.2.2-1build1.
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# This file is part of PyTango (http://pytango.rtfd.io)
#
# Copyright 2006-2012 CELLS / ALBA Synchrotron, Bellaterra, Spain
# Copyright 2013-2014 European Synchrotron Radiation Facility, Grenoble, France
#
# Distributed under the terms of the GNU Lesser General Public License,
# either version 3 of the License, or (at your option) any later version.
# See LICENSE.txt for more info.
# ------------------------------------------------------------------------------
"""
High Level API for writting Tango clients
This is an experimental module. Not part of the official API.
"""
import weakref
import functools
import six
import tango
from tango import DeviceProxy as Device
from tango import CmdArgType
from tango.codec import loads
from tango.codec import dumps as _dumps
_FMT = "pickle"
dumps = functools.partial(_dumps, _FMT)
def _command(device, cmd_info, *args, **kwargs):
name = cmd_info.cmd_name
if cmd_info.in_type == CmdArgType.DevEncoded:
result = device.command_inout(name, dumps((args, kwargs)))
else:
result = device.command_inout(name, *args, **kwargs)
if cmd_info.out_type == CmdArgType.DevEncoded:
result = loads(*result)
return result
class _DeviceHelper(object):
__CMD_FILTER = set(("init", "state", "status"))
__ATTR_FILTER = set(("state", "status"))
__attr_cache = None
__cmd_cache = None
def __init__(self, dev_name, *args, **kwargs):
self.dev_name = dev_name
self.device = Device(dev_name, *args, **kwargs)
self.slots = weakref.WeakKeyDictionary()
def connect(self, signal, slot, event_type=tango.EventType.CHANGE_EVENT):
i = self.device.subscribe_event(signal, event_type, slot)
self.slots[slot] = i
return i
def disconnect(self, signal, slot):
i = self.slots.pop(slot)
self.device.unsubscribe_event(i)
def get_attr_cache(self, refresh=False):
cache = self.__attr_cache
if not cache:
refresh = True
if refresh:
cache = {}
dev = self.device
try:
for attr_info in dev.attribute_list_query_ex():
attr_name = attr_info.name
if attr_name.lower() in self.__ATTR_FILTER:
continue
cache[attr_name] = attr_info
except tango.DevFailed:
pass
self.__attr_cache = cache
return cache
def get_attr_info(self, name):
cache = self.get_attr_cache()
result = cache.get(name)
if result:
return result
else:
cache = self.get_attr_cache(refresh=True)
return cache.get(name)
def get_cmd_cache(self, refresh=False):
cache = self.__cmd_cache
if not cache:
refresh = True
if refresh:
cache = {}
dev = self.device
try:
for cmd_info in dev.command_list_query():
cmd_name = cmd_info.cmd_name
if cmd_name.lower() in self.__CMD_FILTER:
continue
cmd_func = functools.partial(_command, dev, cmd_info)
cmd_func.__name__ = cmd_name
cmd_func.__doc__ = cmd_info.in_type_desc
cmd_info.func = cmd_func
cache[cmd_name] = cmd_info
except tango.DevFailed:
pass
self.__cmd_cache = cache
return cache
def get_cmd_info(self, name):
cache = self.get_cmd_cache()
result = cache.get(name)
if result:
return result
else:
cache = self.get_cmd_cache(refresh=True)
return cache.get(name)
def is_cmd(self, name):
return name.lower() in self.get_cmd_cache()
def members(self):
result = self.get_attr_cache().keys()
result.extend(self.get_cmd_cache().keys())
return result
def get(self, name):
dev = self.device
result = self.get_attr_info(name)
if result:
result = dev.read_attribute(name)
value = result.value
if result.type == tango.DevEncoded:
result = loads(*value)
else:
result = value
return result
result = self.get_cmd_info(name)
if result is None:
raise KeyError("Unknown %s" % name)
return result
def set(self, name, value):
result = self.get_attr_info(name)
if result is None:
raise KeyError("Unknown attribute %s" % name)
if result.data_type == tango.DevEncoded:
self.device.write_attribute(name, dumps(value))
else:
self.device.write_attribute(name, value)
def get_info(self):
try:
return self.__info
except AttributeError:
pass
try:
info = self.device.info()
self.__dict__["__info"] = info
return info
except tango.DevFailed:
return None
def __getitem__(self, name):
if self.get_attr_info(name) is None:
raise KeyError("Unknown attribute %s" % name)
return self.device[name]
def __setitem__(self, name, value):
if self.get_attr_info(name) is None:
raise KeyError("Unknown attribute %s" % name)
self.device[name] = value
def __str__(self):
return self.dstr()
def __repr__(self):
return str(self)
def dstr(self):
info = self.get_info()
klass = "Device"
if info:
klass = info.dev_class
return "{0}({1})".format(klass, self.dev_name)
class Object(object):
"""Tango object"""
def __init__(self, dev_name, *args, **kwargs):
helper = _DeviceHelper(dev_name, *args, **kwargs)
self.__dict__["_helper"] = helper
def __getattr__(self, name):
try:
r = self._helper.get(name)
except KeyError as ke:
six.raise_from(AttributeError('Unknown {0}'.format(name)), ke)
if isinstance(r, tango.CommandInfo):
self.__dict__[name] = r.func
return r.func
return r
def __setattr__(self, name, value):
try:
return self._helper.set(name, value)
except KeyError as ke:
six.raise_from(AttributeError('Unknown {0}'.format(name)), ke)
def __getitem__(self, name):
return self._helper[name]
def __setitem__(self, name, value):
self._helper[name] = value
def __str__(self):
return str(self._helper)
def __repr__(self):
return repr(self._helper)
def __dir__(self):
return self._helper.members()
def get_object_proxy(obj):
"""Experimental function. Not part of the official API"""
return obj._helper.device
def get_object_db(obj):
"""Experimental function. Not part of the official API"""
return get_object_proxy(obj).get_device_db()
def get_object_name(obj):
"""Experimental function. Not part of the official API"""
return get_object_proxy(obj).get_name()
def get_object_info(obj):
"""Experimental function. Not part of the official API"""
return get_object_proxy(obj).info()
def get_attributes_config(obj, refresh=False):
"""Experimental function. Not part of the official API"""
return obj._helper.get_attr_cache(refresh=refresh)
def get_commands_config(obj, refresh=False):
"""Experimental function. Not part of the official API"""
return obj._helper.get_cmd_cache(refresh=refresh)
def connect(obj, signal, slot, event_type=tango.EventType.CHANGE_EVENT):
"""Experimental function. Not part of the official API"""
return obj._helper.connect(signal, slot, event_type=event_type)
def disconnect(obj, signal, slot):
"""Experimental function. Not part of the official API"""
return obj._helper.disconnect(signal, slot)
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