/usr/lib/python2.7/dist-packages/PyTango/device_proxy.py is in python-pytango 8.1.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of PyTango (http://www.tinyurl.com/PyTango)
#
# 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.
# ------------------------------------------------------------------------------
"""
This is an internal PyTango module.
"""
from __future__ import with_statement
__all__ = ["device_proxy_init", "get_device_proxy"]
__docformat__ = "restructuredtext"
import time
import threading
import collections
from ._PyTango import StdStringVector, DbData, DbDatum, AttributeInfo, \
AttributeInfoEx, AttributeInfoList, AttributeInfoListEx, DeviceProxy, \
__CallBackAutoDie, __CallBackPushEvent, EventType, DevFailed, Except, \
ExtractAs, GreenMode
from .utils import is_pure_str, is_non_str_seq, is_integer
from .utils import seq_2_StdStringVector, StdStringVector_2_seq
from .utils import seq_2_DbData, DbData_2_dict
from .utils import document_method as __document_method
from .green import result, submit, green, get_green_mode
_UNSUBSCRIBE_LIFETIME = 60
def get_device_proxy(*args, **kwargs):
"""get_device_proxy(self, dev_name, green_mode=None, wait=True, timeout=True) -> DeviceProxy
get_device_proxy(self, dev_name, need_check_acc, green_mode=None, wait=True, timeout=None) -> DeviceProxy
Returns a new :class:`~PyTango.DeviceProxy`.
There is no difference between using this function and the direct
:class:`~PyTango.DeviceProxy` constructor if you use the default kwargs.
The added value of this function becomes evident when you choose a green_mode
to be *Futures* or *Gevent*. The DeviceProxy constructor internally makes some
network calls which makes it *slow*. By using one of the *green modes* as
green_mode you are allowing other python code to be executed in a cooperative way.
.. note::
The timeout parameter has no relation with the tango device client side
timeout (gettable by :meth:`~PyTango.DeviceProxy.get_timeout_millis` and
settable through :meth:`~PyTango.DeviceProxy.set_timeout_millis`)
:param dev_name: the device name or alias
:type dev_name: str
:param need_check_acc: in first version of the function it defaults to True.
Determines if at creation time of DeviceProxy it should check
for channel access (rarely used)
:type need_check_acc: bool
:param green_mode: determines the mode of execution of the device (including
the way it is created). Defaults to the current global
green_mode (check :func:`~PyTango.get_green_mode` and
:func:`~PyTango.set_green_mode`)
:type green_mode: :obj:`~PyTango.GreenMode`
:param wait: whether or not to wait for result. If green_mode
Ignored when green_mode is Synchronous (always waits).
:type wait: bool
:param timeout: The number of seconds to wait for the result.
If None, then there is no limit on the wait time.
Ignored when green_mode is Synchronous or wait is False.
:type timeout: float
:returns:
if green_mode is Synchronous or wait is True:
:class:`~PyTango.DeviceProxy`
else if green_mode is Futures:
:class:`concurrent.futures.Future`
else if green_mode is Gevent:
:class:`gevent.event.AsynchResult`
:throws:
* a *DevFailed* if green_mode is Synchronous or wait is True
and there is an error creating the device.
* a *concurrent.futures.TimeoutError* if green_mode is Futures,
wait is False, timeout is not None and the time to create the device
has expired.
* a *gevent.timeout.Timeout* if green_mode is Gevent, wait is False,
timeout is not None and the time to create the device has expired.
New in PyTango 8.1.0
"""
# we cannot use the green wrapper because it consumes the green_mode and we
# want to forward it to the DeviceProxy constructor
green_mode = kwargs.get('green_mode', get_green_mode())
wait = kwargs.pop('wait', True)
timeout = kwargs.pop('timeout', None)
d = submit(green_mode, DeviceProxy, *args, **kwargs)
return result(d, green_mode, wait=wait, timeout=timeout)
class __TangoInfo(object):
"""Helper class for when DeviceProxy.info() is not available"""
def __init__(self):
self.dev_class = self.dev_type = 'Device'
self.doc_url = 'http://www.esrf.fr/computing/cs/tango/tango_doc/ds_doc/'
self.server_host = 'Unknown'
self.server_id = 'Unknown'
self.server_version = 1
#-------------------------------------------------------------------------------
# Pythonic API: transform tango commands into methods and tango attributes into
# class members
#-------------------------------------------------------------------------------
def __check_read_attribute(dev_attr):
if dev_attr.has_failed:
raise DevFailed(*dev_attr.get_err_stack())
return dev_attr
def __DeviceProxy__init__(self, *args, **kwargs):
self.__dict__['_green_mode'] = kwargs.pop('green_mode', None)
self.__dict__['_executors'] = executors = {}
self.__dict__['_pending_unsubscribe'] = {}
executors[GreenMode.Futures] = kwargs.pop('executor', None)
executors[GreenMode.Gevent] = kwargs.pop('threadpool', None)
return DeviceProxy.__init_orig__(self, *args, **kwargs)
def __DeviceProxy__get_green_mode(self):
"""Returns the green mode in use by this DeviceProxy.
:returns: the green mode in use by this DeviceProxy.
:rtype: GreenMode
.. seealso::
:func:`PyTango.get_green_mode`
:func:`PyTango.set_green_mode`
New in PyTango 8.1.0
"""
gm = self._green_mode
if gm is None:
gm = get_green_mode()
return gm
def __DeviceProxy__set_green_mode(self, green_mode=None):
"""Sets the green mode to be used by this DeviceProxy
Setting it to None means use the global PyTango green mode
(see :func:`PyTango.get_green_mode`).
:param green_mode: the new green mode
:type green_mode: GreenMode
New in PyTango 8.1.0
"""
self._green_mode = green_mode
def __DeviceProxy__refresh_cmd_cache(self):
cmd_list = self.command_list_query()
cmd_cache = {}
for cmd in cmd_list:
n = cmd.cmd_name.lower()
cmd_cache[n] = cmd, None
self.__dict__['__cmd_cache'] = cmd_cache
def __DeviceProxy__refresh_attr_cache(self):
attr_cache = [attr_name.lower() for attr_name in self.get_attribute_list()]
self.__dict__['__attr_cache'] = attr_cache
def __DeviceProxy__getattr(self, name):
# trait_names is a feature of IPython. Hopefully they will solve
# ticket http://ipython.scipy.org/ipython/ipython/ticket/229 someday
# and the ugly trait_names could be removed.
if name[:2] == "__" or name == 'trait_names':
raise AttributeError(name)
name_l = name.lower()
cmd_info = None
if not hasattr(self, '__cmd_cache'):
try:
self.__refresh_cmd_cache()
except:
pass
try:
cmd_info = self.__cmd_cache[name_l]
except:
pass
if cmd_info is not None:
d, f = cmd_info
if f is None:
doc = "%s(%s) -> %s\n\n" % (d.cmd_name, d.in_type, d.out_type)
doc += " - in (%s): %s\n" % (d.in_type, d.in_type_desc)
doc += " - out (%s): %s\n" % (d.out_type, d.out_type_desc)
def f(*args, **kwds): return self.command_inout(name, *args, **kwds)
f.__doc__ = doc
self.__cmd_cache[name_l] = d, f
return f
find_attr = True
if not hasattr(self, '__attr_cache') or name_l not in self.__attr_cache:
try:
self.__refresh_attr_cache()
except:
find_attr = False
if not find_attr or name_l not in self.__attr_cache:
raise AttributeError(name)
return self.read_attribute(name).value
def __DeviceProxy__setattr(self, name, value):
try:
if not hasattr(self, '__attr_cache') or name.lower() not in self.__attr_cache:
self.__refresh_attr_cache()
except:
return super(DeviceProxy, self).__setattr__(name, value)
if name.lower() in self.__attr_cache:
self.write_attribute(name, value)
else:
return super(DeviceProxy, self).__setattr__(name, value)
def __DeviceProxy__getAttributeNames(self):
"""Return list of magic attributes to extend introspection."""
try:
lst = [cmd.cmd_name for cmd in self.command_list_query()]
lst += self.get_attribute_list()
lst += list(map(str.lower, lst))
lst.sort()
return lst
except Exception:
pass
return []
def __DeviceProxy__getitem(self, key):
return self.read_attribute(key)
def __DeviceProxy__setitem(self, key, value):
return self.write_attribute(key, value)
def __DeviceProxy__contains(self, key):
return key.lower() in map(str.lower, self.get_attribute_list())
def __DeviceProxy__read_attribute(self, value, extract_as=ExtractAs.Numpy):
return __check_read_attribute(self._read_attribute(value, extract_as))
#def __DeviceProxy__read_attribute(self, value, extract_as=ExtractAs.Numpy,
# green_mode=None, wait=True, timeout=None):
# green_mode, submit = submitable(green_mode)
# result = submit(__DeviceProxy__read_attribute_raw, self, value, extract_as=extract_as)
# return get_result(result, green_mode, wait=wait, timeout=timeout)
def __DeviceProxy__read_attributes_asynch(self, attr_names, cb=None, extract_as=ExtractAs.Numpy):
"""
read_attributes_asynch( self, attr_names) -> int
Read asynchronously (polling model) the list of specified attributes.
Parameters :
- attr_names : (sequence<str>) A list of attributes to read.
It should be a StdStringVector or a sequence of str.
Return : an asynchronous call identifier which is needed to get
attributes value.
Throws : ConnectionFailed
New in PyTango 7.0.0
read_attributes_asynch( self, attr_names, callback, extract_as=Numpy) -> None
Read asynchronously (callback model) an attribute list.
Parameters :
- attr_names : (sequence<str>) A list of attributes to read. See read_attributes.
- callback : (callable) This callback object should be an instance of a
user class with an attr_read() method. It can also
be any callable object.
- extract_as : (ExtractAs) Defaults to numpy.
Return : None
Throws : ConnectionFailed
New in PyTango 7.0.0
"""
if cb is None:
return self.__read_attributes_asynch(attr_names)
cb2 = __CallBackAutoDie()
if isinstance(cb, collections.Callable):
cb2.attr_read = cb
else:
cb2.attr_read = cb.attr_read
return self.__read_attributes_asynch(attr_names, cb2, extract_as)
def __DeviceProxy__read_attribute_asynch(self, attr_name, cb=None):
"""
read_attribute_asynch( self, attr_name) -> int
read_attribute_asynch( self, attr_name, callback) -> None
Shortcut to self.read_attributes_asynch([attr_name], cb)
New in PyTango 7.0.0
"""
return self.read_attributes_asynch([attr_name], cb)
def __DeviceProxy__read_attribute_reply(self, *args, **kwds):
"""
read_attribute_reply( self, id, extract_as) -> int
read_attribute_reply( self, id, timeout, extract_as) -> None
Shortcut to self.read_attributes_reply()[0]
New in PyTango 7.0.0
"""
return __check_read_attribute(self.read_attributes_reply(*args, **kwds)[0])
def __DeviceProxy__write_attributes_asynch(self, attr_values, cb=None):
"""
write_attributes_asynch( self, values) -> int
Write asynchronously (polling model) the specified attributes.
Parameters :
- values : (any) See write_attributes.
Return : An asynchronous call identifier which is needed to get the
server reply
Throws : ConnectionFailed
New in PyTango 7.0.0
write_attributes_asynch( self, values, callback) -> None
Write asynchronously (callback model) a single attribute.
Parameters :
- values : (any) See write_attributes.
- callback : (callable) This callback object should be an instance of a user
class with an attr_written() method . It can also be any
callable object.
Return : None
Throws : ConnectionFailed
New in PyTango 7.0.0
"""
if cb is None:
return self.__write_attributes_asynch(attr_values)
cb2 = __CallBackAutoDie()
if isinstance(cb, collections.Callable):
cb2.attr_write = cb
else:
cb2.attr_write = cb.attr_write
return self.__write_attributes_asynch(attr_values, cb2)
def __DeviceProxy__write_attribute_asynch(self, attr_name, value, cb=None):
"""
write_attributes_asynch( self, values) -> int
write_attributes_asynch( self, values, callback) -> None
Shortcut to self.write_attributes_asynch([attr_name, value], cb)
New in PyTango 7.0.0
"""
return self.write_attributes_asynch([(attr_name, value)], cb)
def __DeviceProxy__write_read_attribute(self, attr_name, value, extract_as=ExtractAs.Numpy):
return __check_read_attribute(self._write_read_attribute(attr_name, value, extract_as))
def __DeviceProxy__get_property(self, propname, value=None):
"""
get_property(propname, value=None) -> PyTango.DbData
Get a (list) property(ies) for a device.
This method accepts the following types as propname parameter:
1. string [in] - single property data to be fetched
2. sequence<string> [in] - several property data to be fetched
3. PyTango.DbDatum [in] - single property data to be fetched
4. PyTango.DbData [in,out] - several property data to be fetched.
5. sequence<DbDatum> - several property data to be feteched
Note: for cases 3, 4 and 5 the 'value' parameter if given, is IGNORED.
If value is given it must be a PyTango.DbData that will be filled with the
property values
Parameters :
- propname : (any) property(ies) name(s)
- value : (DbData) (optional, default is None meaning that the
method will create internally a PyTango.DbData and return
it filled with the property values
Return : (DbData) object containing the property(ies) value(s). If a
PyTango.DbData is given as parameter, it returns the same
object otherwise a new PyTango.DbData is returned
Throws : NonDbDevice, ConnectionFailed (with database),
CommunicationFailed (with database),
DevFailed from database device
"""
if is_pure_str(propname) or isinstance(propname, StdStringVector):
new_value = value
if new_value is None:
new_value = DbData()
self._get_property(propname, new_value)
return DbData_2_dict(new_value)
elif isinstance(propname, DbDatum):
new_value = DbData()
new_value.append(propname)
self._get_property(new_value)
return DbData_2_dict(new_value)
elif isinstance(propname, collections.Sequence):
if isinstance(propname, DbData):
self._get_property(propname)
return DbData_2_dict(propname)
if is_pure_str(propname[0]):
new_propname = StdStringVector()
for i in propname: new_propname.append(i)
new_value = value
if new_value is None:
new_value = DbData()
self._get_property(new_propname, new_value)
return DbData_2_dict(new_value)
elif isinstance(propname[0], DbDatum):
new_value = DbData()
for i in propname: new_value.append(i)
self._get_property(new_value)
return DbData_2_dict(new_value)
def __DeviceProxy__put_property(self, value):
"""
put_property(self, value) -> None
Insert or update a list of properties for this device.
This method accepts the following types as value parameter:
1. PyTango.DbDatum - single property data to be inserted
2. PyTango.DbData - several property data to be inserted
3. sequence<DbDatum> - several property data to be inserted
4. dict<str, DbDatum> - keys are property names and value has data to be inserted
5. dict<str, seq<str>> - keys are property names and value has data to be inserted
6. dict<str, obj> - keys are property names and str(obj) is property value
Parameters :
- value : can be one of the following:
1. PyTango.DbDatum - single property data to be inserted
2. PyTango.DbData - several property data to be inserted
3. sequence<DbDatum> - several property data to be inserted
4. dict<str, DbDatum> - keys are property names and value has data to be inserted
5. dict<str, seq<str>> - keys are property names and value has data to be inserted
6. dict<str, obj> - keys are property names and str(obj) is property value
Return : None
Throws : ConnectionFailed, CommunicationFailed
DevFailed from device (DB_SQLError)
"""
if isinstance(value, DbData):
pass
elif isinstance(value, DbDatum):
new_value = DbData()
new_value.append(value)
value = new_value
elif is_non_str_seq(value):
new_value = seq_2_DbData(value)
elif isinstance(value, collections.Mapping):
new_value = DbData()
for k, v in value.items():
if isinstance(v, DbDatum):
new_value.append(v)
continue
db_datum = DbDatum(k)
if is_non_str_seq(v):
seq_2_StdStringVector(v, db_datum.value_string)
else:
db_datum.value_string.append(str(v))
new_value.append(db_datum)
value = new_value
else:
raise TypeError('value must be a PyTango.DbDatum, PyTango.DbData,'\
'a sequence<DbDatum> or a dictionary')
return self._put_property(value)
def __DeviceProxy__delete_property(self, value):
"""
delete_property(self, value)
Delete a the given of properties for this device.
This method accepts the following types as value parameter:
1. string [in] - single property to be deleted
2. PyTango.DbDatum [in] - single property data to be deleted
3. PyTango.DbData [in] - several property data to be deleted
4. sequence<string> [in]- several property data to be deleted
5. sequence<DbDatum> [in] - several property data to be deleted
6. dict<str, obj> [in] - keys are property names to be deleted (values are ignored)
7. dict<str, DbDatum> [in] - several DbDatum.name are property names to be deleted (keys are ignored)
Parameters :
- value : can be one of the following:
1. string [in] - single property data to be deleted
2. PyTango.DbDatum [in] - single property data to be deleted
3. PyTango.DbData [in] - several property data to be deleted
4. sequence<string> [in]- several property data to be deleted
5. sequence<DbDatum> [in] - several property data to be deleted
6. dict<str, obj> [in] - keys are property names to be deleted (values are ignored)
7. dict<str, DbDatum> [in] - several DbDatum.name are property names to be deleted (keys are ignored)
Return : None
Throws : ConnectionFailed, CommunicationFailed
DevFailed from device (DB_SQLError)
"""
if isinstance(value, DbData) or isinstance(value, StdStringVector) or \
is_pure_str(value):
new_value = value
elif isinstance(value, DbDatum):
new_value = DbData()
new_value.append(value)
elif isinstance(value, collections.Sequence):
new_value = DbData()
for e in value:
if isinstance(e, DbDatum):
new_value.append(e)
else:
new_value.append(DbDatum(str(e)))
elif isinstance(value, collections.Mapping):
new_value = DbData()
for k, v in value.items():
if isinstance(v, DbDatum):
new_value.append(v)
else:
new_value.append(DbDatum(k))
else:
raise TypeError('value must be a string, PyTango.DbDatum, '\
'PyTango.DbData, a sequence or a dictionary')
return self._delete_property(new_value)
def __DeviceProxy__get_property_list(self, filter, array=None):
"""
get_property_list(self, filter, array=None) -> obj
Get the list of property names for the device. The parameter
filter allows the user to filter the returned name list. The
wildcard character is '*'. Only one wildcard character is
allowed in the filter parameter.
Parameters :
- filter[in] : (str) the filter wildcard
- array[out] : (sequence obj or None) (optional, default is None)
an array to be filled with the property names. If None
a new list will be created internally with the values.
Return : the given array filled with the property names (or a new list
if array is None)
Throws : NonDbDevice, WrongNameSyntax,
ConnectionFailed (with database),
CommunicationFailed (with database)
DevFailed from database device
New in PyTango 7.0.0
"""
if array is None:
new_array = StdStringVector()
self._get_property_list(filter, new_array)
return new_array
if isinstance(array, StdStringVector):
self._get_property_list(filter, array)
return array
elif isinstance(array, collections.Sequence):
new_array = StdStringVector()
self._get_property_list(filter, new_array)
StdStringVector_2_seq(new_array, array)
return array
raise TypeError('array must be a mutable sequence<string>')
def __DeviceProxy__get_attribute_config(self, value):
"""
get_attribute_config( self, name) -> AttributeInfoEx
Return the attribute configuration for a single attribute.
Parameters :
- name : (str) attribute name
Return : (AttributeInfoEx) Object containing the attribute
information
Throws : ConnectionFailed, CommunicationFailed,
DevFailed from device
Deprecated: use get_attribute_config_ex instead
get_attribute_config( self, names) -> AttributeInfoList
Return the attribute configuration for the list of specified attributes. To get all the
attributes pass a sequence containing the constant PyTango.constants.AllAttr
Parameters :
- names : (sequence<str>) attribute names
Return : (AttributeInfoList) Object containing the attributes
information
Throws : ConnectionFailed, CommunicationFailed,
DevFailed from device
Deprecated: use get_attribute_config_ex instead
"""
if isinstance(value, StdStringVector) or is_pure_str(value):
return self._get_attribute_config(value)
elif isinstance(value, collections.Sequence):
v = seq_2_StdStringVector(value)
return self._get_attribute_config(v)
raise TypeError('value must be a string or a sequence<string>')
def __DeviceProxy__get_attribute_config_ex(self, value):
"""
get_attribute_config_ex( self, name) -> AttributeInfoListEx :
Return the extended attribute configuration for a single attribute.
Parameters :
- name : (str) attribute name
Return : (AttributeInfoEx) Object containing the attribute
information
Throws : ConnectionFailed, CommunicationFailed,
DevFailed from device
get_attribute_config( self, names) -> AttributeInfoListEx :
Return the extended attribute configuration for the list of
specified attributes. To get all the attributes pass a sequence
containing the constant PyTango.constants.AllAttr
Parameters :
- names : (sequence<str>) attribute names
Return : (AttributeInfoList) Object containing the attributes
information
Throws : ConnectionFailed, CommunicationFailed,
DevFailed from device
"""
if isinstance(value, StdStringVector):
return self._get_attribute_config_ex(value)
elif is_pure_str(value):
v = StdStringVector()
v.append(value)
return self._get_attribute_config_ex(v)
elif isinstance(value, collections.Sequence):
v = seq_2_StdStringVector(value)
return self._get_attribute_config_ex(v)
raise TypeError('value must be a string or a sequence<string>')
def __DeviceProxy__set_attribute_config(self, value):
"""
set_attribute_config( self, attr_info) -> None
Change the attribute configuration for the specified attribute
Parameters :
- attr_info : (AttributeInfo) attribute information
Return : None
Throws : ConnectionFailed, CommunicationFailed,
DevFailed from device
set_attribute_config( self, attr_info_ex) -> None
Change the extended attribute configuration for the specified attribute
Parameters :
- attr_info_ex : (AttributeInfoEx) extended attribute information
Return : None
Throws : ConnectionFailed, CommunicationFailed,
DevFailed from device
set_attribute_config( self, attr_info) -> None
Change the attributes configuration for the specified attributes
Parameters :
- attr_info : (sequence<AttributeInfo>) attributes information
Return : None
Throws : ConnectionFailed, CommunicationFailed,
DevFailed from device
set_attribute_config( self, attr_info_ex) -> None
Change the extended attributes configuration for the specified attributes
Parameters :
- attr_info_ex : (sequence<AttributeInfoListEx>) extended
attributes information
Return : None
Throws : ConnectionFailed, CommunicationFailed,
DevFailed from device
"""
if isinstance(value, AttributeInfoEx):
v = AttributeInfoListEx()
v.append(value)
elif isinstance(value, AttributeInfo):
v = AttributeInfoList()
v.append(value)
elif isinstance(value, AttributeInfoList):
v = value
elif isinstance(value, AttributeInfoListEx):
v = value
elif isinstance(value, collections.Sequence):
if not len(value): return
if isinstance(value[0], AttributeInfoEx):
v = AttributeInfoListEx()
elif isinstance(value[0], AttributeInfo):
v = AttributeInfoList()
else:
raise TypeError('value must be a AttributeInfo, AttributeInfoEx, ' \
'sequence<AttributeInfo> or sequence<AttributeInfoEx')
for i in value: v.append(i)
else:
raise TypeError('value must be a AttributeInfo, AttributeInfoEx, ' \
'sequence<AttributeInfo> or sequence<AttributeInfoEx')
return self._set_attribute_config(v)
def __DeviceProxy__get_event_map_lock(self):
"""
Internal helper method"""
if not hasattr(self, '_subscribed_events_lock'):
# do it like this instead of self._subscribed_events = dict() to avoid
# calling __setattr__ which requests list of tango attributes from device
self.__dict__['_subscribed_events_lock'] = threading.Lock()
return self._subscribed_events_lock
def __DeviceProxy__get_event_map(self):
"""
Internal helper method"""
if not hasattr(self, '_subscribed_events'):
# do it like this instead of self._subscribed_events = dict() to avoid
# calling __setattr__ which requests list of tango attributes from device
self.__dict__['_subscribed_events'] = dict()
return self._subscribed_events
def __DeviceProxy__subscribe_event (self, attr_name, event_type, cb_or_queuesize, filters=[], stateless=False, extract_as=ExtractAs.Numpy):
"""
subscribe_event(self, attr_name, event, callback, filters=[], stateless=False, extract_as=Numpy) -> int
The client call to subscribe for event reception in the push model.
The client implements a callback method which is triggered when the
event is received. Filtering is done based on the reason specified and
the event type. For example when reading the state and the reason
specified is "change" the event will be fired only when the state
changes. Events consist of an attribute name and the event reason.
A standard set of reasons are implemented by the system, additional
device specific reasons can be implemented by device servers programmers.
Parameters :
- attr_name : (str) The device attribute name which will be sent
as an event e.g. "current".
- event_type: (EventType) Is the event reason and must be on the enumerated values:
* EventType.CHANGE_EVENT
* EventType.PERIODIC_EVENT
* EventType.ARCHIVE_EVENT
* EventType.ATTR_CONF_EVENT
* EventType.DATA_READY_EVENT
* EventType.USER_EVENT
- callback : (callable) Is any callable object or an object with a
callable "push_event" method.
- filters : (sequence<str>) A variable list of name,value pairs
which define additional filters for events.
- stateless : (bool) When the this flag is set to false, an exception will
be thrown when the event subscription encounters a problem.
With the stateless flag set to true, the event subscription
will always succeed, even if the corresponding device server
is not running. The keep alive thread will try every 10
seconds to subscribe for the specified event. At every
subscription retry, a callback is executed which contains
the corresponding exception
- extract_as : (ExtractAs)
Return : An event id which has to be specified when unsubscribing
from this event.
Throws : EventSystemFailed
subscribe_event(self, attr_name, event, queuesize, filters=[], stateless=False ) -> int
The client call to subscribe for event reception in the pull model.
Instead of a callback method the client has to specify the size of the
event reception buffer.
The event reception buffer is implemented as a round robin buffer. This
way the client can set-up different ways to receive events:
* Event reception buffer size = 1 : The client is interested only
in the value of the last event received. All other events that
have been received since the last reading are discarded.
* Event reception buffer size > 1 : The client has chosen to keep
an event history of a given size. When more events arrive since
the last reading, older events will be discarded.
* Event reception buffer size = ALL_EVENTS : The client buffers all
received events. The buffer size is unlimited and only restricted
by the available memory for the client.
All other parameters are similar to the descriptions given in the
other subscribe_event() version.
"""
if isinstance(cb_or_queuesize, collections.Callable):
cb = __CallBackPushEvent()
cb.push_event = cb_or_queuesize
elif hasattr(cb_or_queuesize, "push_event") and isinstance(cb_or_queuesize.push_event, collections.Callable):
cb = __CallBackPushEvent()
cb.push_event = cb_or_queuesize.push_event
elif is_integer(cb_or_queuesize):
cb = cb_or_queuesize # queuesize
else:
raise TypeError("Parameter cb_or_queuesize should be a number, a" + \
" callable object or an object with a 'push_event' method.")
event_id = self.__subscribe_event(attr_name, event_type, cb, filters, stateless, extract_as)
with self.__get_event_map_lock():
se = self.__get_event_map()
evt_data = se.get(event_id)
if evt_data is not None:
desc = "Internal PyTango error:\n" \
"%s.subscribe_event(%s, %s) already has key %d assigned to (%s, %s)\n" \
"Please report error to PyTango" % \
(self, attr_name, event_type, event_id, evt_data[2], evt_data[1])
Except.throw_exception("Py_InternalError", desc, "DeviceProxy.subscribe_event")
se[event_id] = (cb, event_type, attr_name)
return event_id
def __DeviceProxy__unsubscribe_event(self, event_id):
"""
unsubscribe_event(self, event_id) -> None
Unsubscribes a client from receiving the event specified by event_id.
Parameters :
- event_id : (int) is the event identifier returned by the
DeviceProxy::subscribe_event(). Unlike in
TangoC++ we chech that the event_id has been
subscribed in this DeviceProxy.
Return : None
Throws : EventSystemFailed
"""
events_del = set()
timestamp = time.time()
se = self.__get_event_map()
with self.__get_event_map_lock():
# first delete event callbacks that have expire
for evt_id, (_, expire_time) in self._pending_unsubscribe.items():
if expire_time <= timestamp:
events_del.add(evt_id)
for evt_id in events_del:
del self._pending_unsubscribe[evt_id]
# unsubscribe and put the callback in the pending unsubscribe callbacks
try:
evt_info = se[event_id]
except KeyError:
raise KeyError("This device proxy does not own this subscription " + str(event_id))
del se[event_id]
self._pending_unsubscribe[event_id] = evt_info[0], timestamp + _UNSUBSCRIBE_LIFETIME
self.__unsubscribe_event(event_id)
def __DeviceProxy__unsubscribe_event_all(self):
with self.__get_event_map_lock():
se = self.__get_event_map()
event_ids = list(se.keys())
se.clear()
for event_id in event_ids:
self.__unsubscribe_event(event_id)
def __DeviceProxy__get_events(self, event_id, callback=None, extract_as=ExtractAs.Numpy):
"""
get_events( event_id, callback=None, extract_as=Numpy) -> None
The method extracts all waiting events from the event reception buffer.
If callback is not None, it is executed for every event. During event
subscription the client must have chosen the pull model for this event.
The callback will receive a parameter of type EventData,
AttrConfEventData or DataReadyEventData depending on the type of the
event (event_type parameter of subscribe_event).
If callback is None, the method extracts all waiting events from the
event reception buffer. The returned event_list is a vector of
EventData, AttrConfEventData or DataReadyEventData pointers, just
the same data the callback would have received.
Parameters :
- event_id : (int) is the event identifier returned by the
DeviceProxy.subscribe_event() method.
- callback : (callable) Any callable object or any object with a "push_event"
method.
- extract_as: (ExtractAs)
Return : None
Throws : EventSystemFailed
See Also : subscribe_event
New in PyTango 7.0.0
"""
if callback is None:
queuesize, event_type, attr_name = self.__get_event_map().get(event_id, (None, None, None))
if event_type is None:
raise ValueError("Invalid event_id. You are not subscribed to event %s." % str(event_id))
if event_type in ( EventType.CHANGE_EVENT,
EventType.QUALITY_EVENT,
EventType.PERIODIC_EVENT,
EventType.ARCHIVE_EVENT,
EventType.USER_EVENT ):
return self.__get_data_events(event_id, extract_as)
elif event_type in (EventType.ATTR_CONF_EVENT,):
return self.__get_attr_conf_events(event_id, extract_as)
elif event_type in (EventType.DATA_READY_EVENT,):
return self.__get_data_ready_events(event_id, extract_as)
else:
assert (False)
raise ValueError("Unknown event_type: " + str(event_type))
elif isinstance(callback, collections.Callable):
cb = __CallBackPushEvent()
cb.push_event = callback
return self.__get_callback_events(event_id, cb, extract_as)
elif hasattr(callback, 'push_event') and isinstance(callback.push_event, collections.Callable):
cb = __CallBackPushEvent()
cb.push_event = callback.push_event
return self.__get_callback_events(event_id, cb, extract_as)
else:
raise TypeError("Parameter 'callback' should be None, a callable object or an object with a 'push_event' method.")
def __DeviceProxy___get_info_(self):
"""Protected method that gets device info once and stores it in cache"""
if not hasattr(self, '_dev_info'):
try:
self.__dict__["_dev_info"] = self.info()
except:
return __TangoInfo()
return self._dev_info
def __DeviceProxy__str(self):
info = self._get_info_()
return "%s(%s)" % (info.dev_class, self.dev_name())
def __DeviceProxy__str(self):
info = self._get_info_()
return "%s(%s)" % (info.dev_class, self.dev_name())
def __DeviceProxy__read_attributes(self, *args, **kwargs):
return self._read_attributes(*args, **kwargs)
def __DeviceProxy__write_attribute(self, *args, **kwargs):
return self._write_attribute(*args, **kwargs)
def __DeviceProxy__write_attributes(self, *args, **kwargs):
return self._write_attributes(*args, **kwargs)
def __DeviceProxy__ping(self, *args, **kwargs):
return self._ping(*args, **kwargs)
def __DeviceProxy__state(self, *args, **kwargs):
"""state(self) -> DevState
A method which returns the state of the device.
Parameters : None
Return : (DevState) constant
Example :
dev_st = dev.state()
if dev_st == DevState.ON : ...
"""
return self._state(*args, **kwargs)
def __DeviceProxy__status(self, *args, **kwargs):
"""status(self) -> str
A method which returns the status of the device as a string.
Parameters : None
Return : (str) describing the device status
"""
return self._status(*args, **kwargs)
def __DeviceProxy__write_attribute_reply(self, *args, **kwargs):
"""
write_attribute_reply(self, id) -> None
Check if the answer of an asynchronous write_attribute is arrived
(polling model). If the reply is arrived and if it is a valid reply,
the call returned. If the reply is an exception, it is re-thrown by
this call. An exception is also thrown in case of the reply is not
yet arrived.
Parameters :
- id : (int) the asynchronous call identifier.
Return : None
Throws : AsynCall, AsynReplyNotArrived, CommunicationFailed, DevFailed from device.
New in PyTango 7.0.0
write_attribute_reply(self, id, timeout) -> None
Check if the answer of an asynchronous write_attribute is arrived
(polling model). id is the asynchronous call identifier. If the
reply is arrived and if it is a valid reply, the call returned. If
the reply is an exception, it is re-thrown by this call. If the
reply is not yet arrived, the call will wait (blocking the process)
for the time specified in timeout. If after timeout milliseconds,
the reply is still not there, an exception is thrown. If timeout is
set to 0, the call waits until the reply arrived.
Parameters :
- id : (int) the asynchronous call identifier.
- timeout : (int) the timeout
Return : None
Throws : AsynCall, AsynReplyNotArrived, CommunicationFailed, DevFailed from device.
New in PyTango 7.0.0
"""
return self.write_attributes_reply(*args, **kwargs)
def __init_DeviceProxy():
DeviceProxy.__init_orig__ = DeviceProxy.__init__
DeviceProxy.__init__ = __DeviceProxy__init__
DeviceProxy.get_green_mode = __DeviceProxy__get_green_mode
DeviceProxy.set_green_mode = __DeviceProxy__set_green_mode
DeviceProxy.__getattr__ = __DeviceProxy__getattr
DeviceProxy.__setattr__ = __DeviceProxy__setattr
DeviceProxy.__getitem__ = __DeviceProxy__getitem
DeviceProxy.__setitem__ = __DeviceProxy__setitem
DeviceProxy.__contains__ = __DeviceProxy__contains
DeviceProxy._getAttributeNames = __DeviceProxy__getAttributeNames
DeviceProxy.__refresh_cmd_cache = __DeviceProxy__refresh_cmd_cache
DeviceProxy.__refresh_attr_cache = __DeviceProxy__refresh_attr_cache
DeviceProxy.ping = green(__DeviceProxy__ping)
DeviceProxy.state = green(__DeviceProxy__state)
DeviceProxy.status = green(__DeviceProxy__status)
DeviceProxy.read_attribute = green(__DeviceProxy__read_attribute)
DeviceProxy.read_attributes = green(__DeviceProxy__read_attributes)
DeviceProxy.write_attribute = green(__DeviceProxy__write_attribute)
DeviceProxy.write_attributes = green(__DeviceProxy__write_attributes)
DeviceProxy.write_read_attribute = green(__DeviceProxy__write_read_attribute)
DeviceProxy.read_attributes_asynch = __DeviceProxy__read_attributes_asynch
DeviceProxy.read_attribute_asynch = __DeviceProxy__read_attribute_asynch
DeviceProxy.read_attribute_reply = __DeviceProxy__read_attribute_reply
DeviceProxy.write_attributes_asynch = __DeviceProxy__write_attributes_asynch
DeviceProxy.write_attribute_asynch = __DeviceProxy__write_attribute_asynch
DeviceProxy.write_attribute_reply = __DeviceProxy__write_attribute_reply
DeviceProxy.get_property = __DeviceProxy__get_property
DeviceProxy.put_property = __DeviceProxy__put_property
DeviceProxy.delete_property = __DeviceProxy__delete_property
DeviceProxy.get_property_list = __DeviceProxy__get_property_list
DeviceProxy.get_attribute_config = __DeviceProxy__get_attribute_config
DeviceProxy.get_attribute_config_ex = __DeviceProxy__get_attribute_config_ex
DeviceProxy.set_attribute_config = __DeviceProxy__set_attribute_config
DeviceProxy.__get_event_map = __DeviceProxy__get_event_map
DeviceProxy.__get_event_map_lock = __DeviceProxy__get_event_map_lock
DeviceProxy.subscribe_event = green(__DeviceProxy__subscribe_event)
DeviceProxy.unsubscribe_event = green(__DeviceProxy__unsubscribe_event)
DeviceProxy.__unsubscribe_event_all = __DeviceProxy__unsubscribe_event_all
DeviceProxy.get_events = __DeviceProxy__get_events
DeviceProxy.__str__ = __DeviceProxy__str
DeviceProxy.__repr__ = __DeviceProxy__str
DeviceProxy._get_info_ = __DeviceProxy___get_info_
def __doc_DeviceProxy():
def document_method(method_name, desc, append=True):
return __document_method(DeviceProxy, method_name, desc, append)
DeviceProxy.__doc__ = """\
DeviceProxy is the high level Tango object which provides the client with
an easy-to-use interface to TANGO devices. DeviceProxy provides interfaces
to all TANGO Device interfaces.The DeviceProxy manages timeouts, stateless
connections and reconnection if the device server is restarted. To create
a DeviceProxy, a Tango Device name must be set in the object constructor.
Example :
dev = PyTango.DeviceProxy("sys/tg_test/1")
DeviceProxy(dev_name, green_mode=None, wait=True, timeout=True) -> DeviceProxy
DeviceProxy(self, dev_name, need_check_acc, green_mode=None, wait=True, timeout=True) -> DeviceProxy
Creates a new :class:`~PyTango.DeviceProxy`.
:param dev_name: the device name or alias
:type dev_name: str
:param need_check_acc: in first version of the function it defaults to True.
Determines if at creation time of DeviceProxy it should check
for channel access (rarely used)
:type need_check_acc: bool
:param green_mode: determines the mode of execution of the device (including.
the way it is created). Defaults to the current global
green_mode (check :func:`~PyTango.get_green_mode` and
:func:`~PyTango.set_green_mode`)
:type green_mode: :obj:`~PyTango.GreenMode`
:param wait: whether or not to wait for result. If green_mode
Ignored when green_mode is Synchronous (always waits).
:type wait: bool
:param timeout: The number of seconds to wait for the result.
If None, then there is no limit on the wait time.
Ignored when green_mode is Synchronous or wait is False.
:type timeout: float
:returns:
if green_mode is Synchronous or wait is True:
:class:`~PyTango.DeviceProxy`
elif green_mode is Futures:
:class:`concurrent.futures.Future`
elif green_mode is Gevent:
:class:`gevent.event.AsynchResult`
:throws:
* :class:`~PyTango.DevFailed` if green_mode is Synchronous or wait is True
and there is an error creating the device.
* :class:`concurrent.futures.TimeoutError` if green_mode is Futures,
wait is False, timeout is not None and the time to create the device
has expired.
* :class:`gevent.timeout.Timeout` if green_mode is Gevent, wait is False,
timeout is not None and the time to create the device has expired.
.. versionadded:: 8.1.0
*green_mode* parameter.
*wait* parameter.
*timeout* parameter.
"""
#-------------------------------------
# General methods
#-------------------------------------
document_method("info", """
info(self) -> DeviceInfo
A method which returns information on the device
Parameters : None
Return : (DeviceInfo) object
Example :
dev_info = dev.info()
print(dev_info.dev_class)
print(dev_info.server_id)
print(dev_info.server_host)
print(dev_info.server_version)
print(dev_info.doc_url)
print(dev_info.dev_type)
All DeviceInfo fields are strings except for the server_version
which is an integer"
""")
document_method("get_device_db", """
get_device_db(self) -> Database
Returns the internal database reference
Parameters : None
Return : (Database) object
New in PyTango 7.0.0
""")
document_method("adm_name", """
adm_name(self) -> str
Return the name of the corresponding administrator device. This is
useful if you need to send an administration command to the device
server, e.g restart it
New in PyTango 3.0.4
""")
document_method("description", """
description(self) -> str
Get device description.
Parameters : None
Return : (str) describing the device
""")
document_method("name", """
name(self) -> str
Return the device name from the device itself.
""")
document_method("alias", """
alias(self) -> str
Return the device alias if one is defined.
Otherwise, throws exception.
Return : (str) device alias
""")
document_method("get_tango_lib_version", """
get_tango_lib_version(self) -> int
Returns the Tango lib version number used by the remote device
Otherwise, throws exception.
Return : (int) The device Tango lib version as a 3 or 4 digits number.
Possible return value are: 100,200,500,520,700,800,810,...
New in PyTango 8.1.0
""")
document_method("ping", """
ping(self) -> int
A method which sends a ping to the device
Parameters : None
Return : (int) time elapsed in microseconds
Throws : exception if device is not alive
""")
document_method("black_box", """
black_box(self, n) -> sequence<str>
Get the last commands executed on the device server
Parameters :
- n : n number of commands to get
Return : (sequence<str>) sequence of strings containing the date, time,
command and from which client computer the command
was executed
Example :
print(black_box(4))
""")
#-------------------------------------
# Device methods
#-------------------------------------
document_method("command_query", """
command_query(self, command) -> CommandInfo
Query the device for information about a single command.
Parameters :
- command : (str) command name
Return : (CommandInfo) object
Throws : ConnectionFailed, CommunicationFailed, DevFailed from device
Example :
com_info = dev.command_query(""DevString"")
print(com_info.cmd_name)
print(com_info.cmd_tag)
print(com_info.in_type)
print(com_info.out_type)
print(com_info.in_type_desc)
print(com_info.out_type_desc)
print(com_info.disp_level)
See CommandInfo documentation string form more detail
""")
document_method("command_list_query", """
command_list_query(self) -> sequence<CommandInfo>
Query the device for information on all commands.
Parameters : None
Return : (CommandInfoList) Sequence of CommandInfo objects
""")
document_method("import_info", """
import_info(self) -> DbDevImportInfo
Query the device for import info from the database.
Parameters : None
Return : (DbDevImportInfo)
Example :
dev_import = dev.import_info()
print(dev_import.name)
print(dev_import.exported)
print(dev_ior.ior)
print(dev_version.version)
All DbDevImportInfo fields are strings except for exported which
is an integer"
""")
#-------------------------------------
# Property methods
#-------------------------------------
# get_property -> in code
# put_property -> in code
# delete_property -> in code
# get_property_list -> in code
#-------------------------------------
# Attribute methods
#-------------------------------------
document_method("get_attribute_list", """
get_attribute_list(self) -> sequence<str>
Return the names of all attributes implemented for this device.
Parameters : None
Return : sequence<str>
Throws : ConnectionFailed, CommunicationFailed,
DevFailed from device
""")
# get_attribute_config -> in code
# get_attribute_config_ex -> in code
document_method("attribute_query", """
attribute_query(self, attr_name) -> AttributeInfoEx
Query the device for information about a single attribute.
Parameters :
- attr_name :(str) the attribute name
Return : (AttributeInfoEx) containing the attribute
configuration
Throws : ConnectionFailed, CommunicationFailed,
DevFailed from device
""")
document_method("attribute_list_query", """
attribute_list_query(self) -> sequence<AttributeInfo>
Query the device for info on all attributes. This method returns
a sequence of PyTango.AttributeInfo.
Parameters : None
Return : (sequence<AttributeInfo>) containing the
attributes configuration
Throws : ConnectionFailed, CommunicationFailed,
DevFailed from device
""")
document_method("attribute_list_query_ex", """
attribute_list_query_ex(self) -> sequence<AttributeInfoEx>
Query the device for info on all attributes. This method returns
a sequence of PyTango.AttributeInfoEx.
Parameters : None
Return : (sequence<AttributeInfoEx>) containing the
attributes configuration
Throws : ConnectionFailed, CommunicationFailed,
DevFailed from device
""")
# set_attribute_config -> in code
document_method("read_attribute", """
read_attribute(self, attr_name, extract_as=ExtractAs.Numpy, green_mode=None, wait=True, timeout=None) -> DeviceAttribute
Read a single attribute.
Parameters :
- attr_name : (str) The name of the attribute to read.
- extract_as : (ExtractAs) Defaults to numpy.
- green_mode : (GreenMode) Defaults to the current DeviceProxy GreenMode.
(see :meth:`~PyTango.DeviceProxy.get_green_mode` and
:meth:`~PyTango.DeviceProxy.set_green_mode`).
- wait : (bool) whether or not to wait for result. If green_mode
is *Synchronous*, this parameter is ignored as it always
waits for the result.
Ignored when green_mode is Synchronous (always waits).
- timeout : (float) The number of seconds to wait for the result.
If None, then there is no limit on the wait time.
Ignored when green_mode is Synchronous or wait is False.
Return : (DeviceAttribute)
Throws : ConnectionFailed, CommunicationFailed, DevFailed from device
TimeoutError (green_mode == Futures) If the future didn't finish executing before the given timeout.
Timeout (green_mode == Gevent) If the async result didn't finish executing before the given timeout.
.. versionchanged:: 7.1.4
For DevEncoded attributes, before it was returning a DeviceAttribute.value
as a tuple **(format<str>, data<str>)** no matter what was the *extract_as*
value was. Since 7.1.4, it returns a **(format<str>, data<buffer>)**
unless *extract_as* is String, in which case it returns
**(format<str>, data<str>)**.
.. versionchanged:: 8.0.0
For DevEncoded attributes, now returns a DeviceAttribute.value
as a tuple **(format<str>, data<bytes>)** unless *extract_as* is String,
in which case it returns **(format<str>, data<str>)**. Carefull, if
using python >= 3 data<str> is decoded using default python
*utf-8* encoding. This means that PyTango assumes tango DS was written
encapsulating string into *utf-8* which is the default python encoding.
.. versionadded:: 8.1.0
*green_mode* parameter.
*wait* parameter.
*timeout* parameter.
""")
document_method("read_attributes", """
read_attributes(self, attr_names, extract_as=ExtractAs.Numpy, green_mode=None, wait=True, timeout=None) -> sequence<DeviceAttribute>
Read the list of specified attributes.
Parameters :
- attr_names : (sequence<str>) A list of attributes to read.
- extract_as : (ExtractAs) Defaults to numpy.
- green_mode : (GreenMode) Defaults to the current DeviceProxy GreenMode.
(see :meth:`~PyTango.DeviceProxy.get_green_mode` and
:meth:`~PyTango.DeviceProxy.set_green_mode`).
- wait : (bool) whether or not to wait for result. If green_mode
is *Synchronous*, this parameter is ignored as it always
waits for the result.
Ignored when green_mode is Synchronous (always waits).
- timeout : (float) The number of seconds to wait for the result.
If None, then there is no limit on the wait time.
Ignored when green_mode is Synchronous or wait is False.
Return : (sequence<DeviceAttribute>)
Throws : ConnectionFailed, CommunicationFailed, DevFailed from device
TimeoutError (green_mode == Futures) If the future didn't finish executing before the given timeout.
Timeout (green_mode == Gevent) If the async result didn't finish executing before the given timeout.
.. versionadded:: 8.1.0
*green_mode* parameter.
*wait* parameter.
*timeout* parameter.
""")
document_method("write_attribute", """
write_attribute(self, attr_name, value, green_mode=None, wait=True, timeout=None) -> None
write_attribute(self, attr_info, value, green_mode=None, wait=True, timeout=None) -> None
Write a single attribute.
Parameters :
- attr_name : (str) The name of the attribute to write.
- attr_info : (AttributeInfo)
- value : The value. For non SCALAR attributes it may be any sequence of sequences.
- green_mode : (GreenMode) Defaults to the current DeviceProxy GreenMode.
(see :meth:`~PyTango.DeviceProxy.get_green_mode` and
:meth:`~PyTango.DeviceProxy.set_green_mode`).
- wait : (bool) whether or not to wait for result. If green_mode
is *Synchronous*, this parameter is ignored as it always
waits for the result.
Ignored when green_mode is Synchronous (always waits).
- timeout : (float) The number of seconds to wait for the result.
If None, then there is no limit on the wait time.
Ignored when green_mode is Synchronous or wait is False.
Throws : ConnectionFailed, CommunicationFailed, DeviceUnlocked, DevFailed from device
TimeoutError (green_mode == Futures) If the future didn't finish executing before the given timeout.
Timeout (green_mode == Gevent) If the async result didn't finish executing before the given timeout.
.. versionadded:: 8.1.0
*green_mode* parameter.
*wait* parameter.
*timeout* parameter.
""")
document_method("write_attributes", """
write_attributes(self, name_val, green_mode=None, wait=True, timeout=None) -> None
Write the specified attributes.
Parameters :
- name_val: A list of pairs (attr_name, value). See write_attribute
- green_mode : (GreenMode) Defaults to the current DeviceProxy GreenMode.
(see :meth:`~PyTango.DeviceProxy.get_green_mode` and
:meth:`~PyTango.DeviceProxy.set_green_mode`).
- wait : (bool) whether or not to wait for result. If green_mode
is *Synchronous*, this parameter is ignored as it always
waits for the result.
Ignored when green_mode is Synchronous (always waits).
- timeout : (float) The number of seconds to wait for the result.
If None, then there is no limit on the wait time.
Ignored when green_mode is Synchronous or wait is False.
Throws : ConnectionFailed, CommunicationFailed, DeviceUnlocked,
DevFailed or NamedDevFailedList from device
TimeoutError (green_mode == Futures) If the future didn't finish executing before the given timeout.
Timeout (green_mode == Gevent) If the async result didn't finish executing before the given timeout.
.. versionadded:: 8.1.0
*green_mode* parameter.
*wait* parameter.
*timeout* parameter.
""")
document_method("write_read_attribute", """
write_read_attribute(self, attr_name, value, extract_as=ExtractAs.Numpy, green_mode=None, wait=True, timeout=None) -> DeviceAttribute
Write then read a single attribute in a single network call.
By default (serialisation by device), the execution of this call in
the server can't be interrupted by other clients.
Parameters : see write_attribute(attr_name, value)
Return : A PyTango.DeviceAttribute object.
Throws : ConnectionFailed, CommunicationFailed, DeviceUnlocked,
DevFailed from device, WrongData
TimeoutError (green_mode == Futures) If the future didn't finish executing before the given timeout.
Timeout (green_mode == Gevent) If the async result didn't finish executing before the given timeout.
New in PyTango 7.0.0
.. versionadded:: 8.1.0
*green_mode* parameter.
*wait* parameter.
*timeout* parameter.
""")
#-------------------------------------
# History methods
#-------------------------------------
document_method("command_history", """
command_history(self, cmd_name, depth) -> sequence<DeviceDataHistory>
Retrieve command history from the command polling buffer. See
chapter on Advanced Feature for all details regarding polling
Parameters :
- cmd_name : (str) Command name.
- depth : (int) The wanted history depth.
Return : This method returns a vector of DeviceDataHistory types.
Throws : NonSupportedFeature, ConnectionFailed,
CommunicationFailed, DevFailed from device
""")
document_method("attribute_history", """
attribute_history(self, attr_name, depth, extract_as=ExtractAs.Numpy) -> sequence<DeviceAttributeHistory>
Retrieve attribute history from the attribute polling buffer. See
chapter on Advanced Feature for all details regarding polling
Parameters :
- attr_name : (str) Attribute name.
- depth : (int) The wanted history depth.
- extract_as : (ExtractAs)
Return : This method returns a vector of DeviceAttributeHistory types.
Throws : NonSupportedFeature, ConnectionFailed,
CommunicationFailed, DevFailed from device
""")
#-------------------------------------
# Polling administration methods
#-------------------------------------
document_method("polling_status", """
polling_status(self) -> sequence<str>
Return the device polling status.
Parameters : None
Return : (sequence<str>) One string for each polled command/attribute.
Each string is multi-line string with:
- attribute/command name
- attribute/command polling period in milliseconds
- attribute/command polling ring buffer
- time needed for last attribute/command execution in milliseconds
- time since data in the ring buffer has not been updated
- delta time between the last records in the ring buffer
- exception parameters in case of the last execution failed
""")
document_method("poll_command", """
poll_command(self, cmd_name, period) -> None
Add a command to the list of polled commands.
Parameters :
- cmd_name : (str) command name
- period : (int) polling period in milliseconds
Return : None
""")
document_method("poll_attribute", """
poll_attribute(self, attr_name, period) -> None
Add an attribute to the list of polled attributes.
Parameters :
- attr_name : (str) attribute name
- period : (int) polling period in milliseconds
Return : None
""")
document_method("get_command_poll_period", """
get_command_poll_period(self, cmd_name) -> int
Return the command polling period.
Parameters :
- cmd_name : (str) command name
Return : polling period in milliseconds
""")
document_method("get_attribute_poll_period", """
get_attribute_poll_period(self, attr_name) -> int
Return the attribute polling period.
Parameters :
- attr_name : (str) attribute name
Return : polling period in milliseconds
""")
document_method("is_command_polled", """
is_command_polled(self, cmd_name) -> bool
True if the command is polled.
Parameters :
- cmd_name : (str) command name
Return : boolean value
""")
document_method("is_attribute_polled", """
is_attribute_polled(self, attr_name) -> bool
True if the attribute is polled.
Parameters :
- attr_name : (str) attribute name
Return : boolean value
""")
document_method("stop_poll_command", """
stop_poll_command(self, cmd_name) -> None
Remove a command from the list of polled commands.
Parameters :
- cmd_name : (str) command name
Return : None
""")
document_method("stop_poll_attribute", """
stop_poll_attribute(self, attr_name) -> None
Remove an attribute from the list of polled attributes.
Parameters :
- attr_name : (str) attribute name
Return : None
""")
#-------------------------------------
# Asynchronous methods
#-------------------------------------
# read_attribute_asynch -> in code
# read_attributes_asynch -> in code
# read_attribute_reply -> in code
document_method("read_attributes_reply", """
read_attributes_reply(self, id, extract_as=ExtractAs.Numpy) -> DeviceAttribute
Check if the answer of an asynchronous read_attribute is
arrived (polling model).
Parameters :
- id : (int) is the asynchronous call identifier.
- extract_as : (ExtractAs)
Return : If the reply is arrived and if it is a valid reply, it is
returned to the caller in a list of DeviceAttribute. If the
reply is an exception, it is re-thrown by this call. An
exception is also thrown in case of the reply is not yet
arrived.
Throws : AsynCall, AsynReplyNotArrived, ConnectionFailed,
CommunicationFailed, DevFailed from device
New in PyTango 7.0.0
read_attributes_reply(self, id, timeout, extract_as=ExtractAs.Numpy) -> DeviceAttribute
Check if the answer of an asynchronous read_attributes is arrived (polling model).
Parameters :
- id : (int) is the asynchronous call identifier.
- timeout : (int)
- extract_as : (ExtractAs)
Return : If the reply is arrived and if it is a valid reply, it is
returned to the caller in a list of DeviceAttribute. If the
reply is an exception, it is re-thrown by this call. If the
reply is not yet arrived, the call will wait (blocking the
process) for the time specified in timeout. If after
timeout milliseconds, the reply is still not there, an
exception is thrown. If timeout is set to 0, the call waits
until the reply arrived.
Throws : AsynCall, AsynReplyNotArrived, ConnectionFailed,
CommunicationFailed, DevFailed from device
New in PyTango 7.0.0
""")
document_method("pending_asynch_call", """
pending_asynch_call(self) -> int
Return number of device asynchronous pending requests"
New in PyTango 7.0.0
""")
# write_attributes_asynch -> in code
document_method("write_attributes_reply", """
write_attributes_reply(self, id) -> None
Check if the answer of an asynchronous write_attributes is arrived
(polling model). If the reply is arrived and if it is a valid reply,
the call returned. If the reply is an exception, it is re-thrown by
this call. An exception is also thrown in case of the reply is not
yet arrived.
Parameters :
- id : (int) the asynchronous call identifier.
Return : None
Throws : AsynCall, AsynReplyNotArrived, CommunicationFailed, DevFailed from device.
New in PyTango 7.0.0
write_attributes_reply(self, id, timeout) -> None
Check if the answer of an asynchronous write_attributes is arrived
(polling model). id is the asynchronous call identifier. If the
reply is arrived and if it is a valid reply, the call returned. If
the reply is an exception, it is re-thrown by this call. If the
reply is not yet arrived, the call will wait (blocking the process)
for the time specified in timeout. If after timeout milliseconds,
the reply is still not there, an exception is thrown. If timeout is
set to 0, the call waits until the reply arrived.
Parameters :
- id : (int) the asynchronous call identifier.
- timeout : (int) the timeout
Return : None
Throws : AsynCall, AsynReplyNotArrived, CommunicationFailed, DevFailed from device.
New in PyTango 7.0.0
""")
#-------------------------------------
# Logging administration methods
#-------------------------------------
document_method("add_logging_target", """
add_logging_target(self, target_type_target_name) -> None
Adds a new logging target to the device.
The target_type_target_name input parameter must follow the
format: target_type::target_name. Supported target types are:
console, file and device. For a device target, the target_name
part of the target_type_target_name parameter must contain the
name of a log consumer device (as defined in A.8). For a file
target, target_name is the full path to the file to log to. If
omitted, the device's name is used to build the file name
(which is something like domain_family_member.log). Finally, the
target_name part of the target_type_target_name input parameter
is ignored in case of a console target and can be omitted.
Parameters :
- target_type_target_name : (str) logging target
Return : None
Throws : DevFailed from device
New in PyTango 7.0.0
""")
document_method("remove_logging_target", """
remove_logging_target(self, target_type_target_name) -> None
Removes a logging target from the device's target list.
The target_type_target_name input parameter must follow the
format: target_type::target_name. Supported target types are:
console, file and device. For a device target, the target_name
part of the target_type_target_name parameter must contain the
name of a log consumer device (as defined in ). For a file
target, target_name is the full path to the file to remove.
If omitted, the default log file is removed. Finally, the
target_name part of the target_type_target_name input parameter
is ignored in case of a console target and can be omitted.
If target_name is set to '*', all targets of the specified
target_type are removed.
Parameters :
- target_type_target_name : (str) logging target
Return : None
New in PyTango 7.0.0
""")
document_method("get_logging_target", """
get_logging_target(self) -> sequence<str>
Returns a sequence of string containing the current device's
logging targets. Each vector element has the following format:
target_type::target_name. An empty sequence is returned is the
device has no logging targets.
Parameters : None
Return : a squence<str> with the logging targets
New in PyTango 7.0.0
""")
document_method("get_logging_level", """
get_logging_level(self) -> int
Returns the current device's logging level, where:
- 0=OFF
- 1=FATAL
- 2=ERROR
- 3=WARNING
- 4=INFO
- 5=DEBUG
Parameters :None
Return : (int) representing the current logging level
New in PyTango 7.0.0
""")
document_method("set_logging_level", """
set_logging_level(self, (int)level) -> None
Changes the device's logging level, where:
- 0=OFF
- 1=FATAL
- 2=ERROR
- 3=WARNING
- 4=INFO
- 5=DEBUG
Parameters :
- level : (int) logging level
Return : None
New in PyTango 7.0.0
""")
#-------------------------------------
# Event methods
#-------------------------------------
# subscribe_event -> in code
# unsubscribe_event -> in code
# get_events -> in code
document_method("event_queue_size", """
event_queue_size(self, event_id) -> int
Returns the number of stored events in the event reception
buffer. After every call to DeviceProxy.get_events(), the event
queue size is 0. During event subscription the client must have
chosen the 'pull model' for this event. event_id is the event
identifier returned by the DeviceProxy.subscribe_event() method.
Parameters :
- event_id : (int) event identifier
Return : an integer with the queue size
Throws : EventSystemFailed
New in PyTango 7.0.0
""")
document_method("get_last_event_date", """
get_last_event_date(self, event_id) -> TimeVal
Returns the arrival time of the last event stored in the event
reception buffer. After every call to DeviceProxy:get_events(),
the event reception buffer is empty. In this case an exception
will be returned. During event subscription the client must have
chosen the 'pull model' for this event. event_id is the event
identifier returned by the DeviceProxy.subscribe_event() method.
Parameters :
- event_id : (int) event identifier
Return : (PyTango.TimeVal) representing the arrival time
Throws : EventSystemFailed
New in PyTango 7.0.0
""")
document_method("is_event_queue_empty", """
is_event_queue_empty(self, event_id) -> bool
Returns true when the event reception buffer is empty. During
event subscription the client must have chosen the 'pull model'
for this event. event_id is the event identifier returned by the
DeviceProxy.subscribe_event() method.
Parameters :
- event_id : (int) event identifier
Return : (bool) True if queue is empty or False otherwise
Throws : EventSystemFailed
New in PyTango 7.0.0
""")
#-------------------------------------
# Locking methods
#-------------------------------------
document_method("lock", """
lock(self, (int)lock_validity) -> None
Lock a device. The lock_validity is the time (in seconds) the
lock is kept valid after the previous lock call. A default value
of 10 seconds is provided and should be fine in most cases. In
case it is necessary to change the lock validity, it's not
possible to ask for a validity less than a minimum value set to
2 seconds. The library provided an automatic system to
periodically re lock the device until an unlock call. No code is
needed to start/stop this automatic re-locking system. The
locking system is re-entrant. It is then allowed to call this
method on a device already locked by the same process. The
locking system has the following features:
* It is impossible to lock the database device or any device
server process admin device
* Destroying a locked DeviceProxy unlocks the device
* Restarting a locked device keeps the lock
* It is impossible to restart a device locked by someone else
* Restarting a server breaks the lock
A locked device is protected against the following calls when
executed by another client:
* command_inout call except for device state and status
requested via command and for the set of commands defined as
allowed following the definition of allowed command in the
Tango control access schema.
* write_attribute call
* write_read_attribute call
* set_attribute_config call
Parameters :
- lock_validity : (int) lock validity time in seconds
(optional, default value is
PyTango.constants.DEFAULT_LOCK_VALIDITY)
Return : None
New in PyTango 7.0.0
""")
document_method("unlock", """
unlock(self, (bool)force) -> None
Unlock a device. If used, the method argument provides a back
door on the locking system. If this argument is set to true,
the device will be unlocked even if the caller is not the locker.
This feature is provided for administration purpopse and should
be used very carefully. If this feature is used, the locker will
receive a DeviceUnlocked during the next call which is normally
protected by the locking Tango system.
Parameters :
- force : (bool) force unlocking even if we are not the
locker (optional, default value is False)
Return : None
New in PyTango 7.0.0
""")
document_method("locking_status", """
locking_status(self) -> str
This method returns a plain string describing the device locking
status. This string can be:
* 'Device <device name> is not locked' in case the device is
not locked
* 'Device <device name> is locked by CPP or Python client with
PID <pid> from host <host name>' in case the device is
locked by a CPP client
* 'Device <device name> is locked by JAVA client class
<main class> from host <host name>' in case the device is
locked by a JAVA client
Parameters : None
Return : a string representing the current locking status
New in PyTango 7.0.0"
""")
document_method("is_locked", """
is_locked(self) -> bool
Returns True if the device is locked. Otherwise, returns False.
Parameters : None
Return : (bool) True if the device is locked. Otherwise, False
New in PyTango 7.0.0
""")
document_method("is_locked_by_me", """
is_locked_by_me(self) -> bool
Returns True if the device is locked by the caller. Otherwise,
returns False (device not locked or locked by someone else)
Parameters : None
Return : (bool) True if the device is locked by us.
Otherwise, False
New in PyTango 7.0.0
""")
document_method("get_locker", """
get_locker(self, lockinfo) -> bool
If the device is locked, this method returns True an set some
locker process informations in the structure passed as argument.
If the device is not locked, the method returns False.
Parameters :
- lockinfo [out] : (PyTango.LockInfo) object that will be filled
with lock informantion
Return : (bool) True if the device is locked by us.
Otherwise, False
New in PyTango 7.0.0
""")
def device_proxy_init(doc=True):
__init_DeviceProxy()
if doc:
__doc_DeviceProxy()
|