/usr/lib/python3/dist-packages/tango/tango_object.py is in python3-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.
# ------------------------------------------------------------------------------
"""Server for tango objects."""
import os
import sys
import types
import logging
import weakref
import inspect
import functools
from .codec import loads, dumps
from .attr_data import AttrData
from .utils import TO_TANGO_TYPE
from ._tango import AttrDataFormat, CmdArgType, GreenMode
from ._tango import DbDevInfo, Database, DevState, constants
from .server import Device, _to_classes, _add_classes
from .server import get_worker, set_worker
from .green import get_executor
__all__ = ['Server']
_CLEAN_UP_TEMPLATE = """
import sys
from tango import Database
db = Database()
server_instance = '{server_instance}'
try:
devices = db.get_device_class_list(server_instance)[::2]
for device in devices:
db.delete_device(device)
try:
db.delete_device_alias(db.get_alias(device))
except:
pass
except:
print ('Failed to cleanup!')
"""
def __to_tango_type_fmt(value):
dfmt = AttrDataFormat.SCALAR
value_t = type(value)
dtype = TO_TANGO_TYPE.get(value_t)
max_dim_x, max_dim_y = 1, 0
if dtype is None:
if constants.NUMPY_SUPPORT:
import numpy
else:
numpy = None
if numpy and isinstance(value, numpy.ndarray):
dtype = TO_TANGO_TYPE.get(value.dtype.name)
shape_l = len(value.shape)
if shape_l == 1:
dfmt = AttrDataFormat.SPECTRUM
max_dim_x = max(2 ** 16, value.shape[0])
elif shape_l == 2:
dfmt = AttrDataFormat.IMAGE
max_dim_x = max(2 ** 16, value.shape[0])
max_dim_y = max(2 ** 16, value.shape[1])
else:
dtype = CmdArgType.DevEncoded
return dtype, dfmt, max_dim_x, max_dim_y
def create_tango_class(server, obj, tango_class_name=None, member_filter=None):
slog = server.server_instance.replace("/", ".")
log = logging.getLogger("tango.Server." + slog)
obj_klass = obj.__class__
obj_klass_name = obj_klass.__name__
if tango_class_name is None:
tango_class_name = obj_klass_name
class DeviceDispatcher(Device):
TangoClassName = tango_class_name
def __init__(self, tango_class_obj, name):
tango_object = server.get_tango_object(name)
self.__tango_object = weakref.ref(tango_object)
Device.__init__(self, tango_class_obj, name)
def init_device(self):
Device.init_device(self)
self.set_state(DevState.ON)
@property
def _tango_object(self):
return self.__tango_object()
@property
def _object(self):
return self._tango_object._object
DeviceDispatcher.__name__ = tango_class_name
DeviceDispatcher.TangoClassName = tango_class_name
DeviceDispatcherClass = DeviceDispatcher.TangoClassClass
for name in dir(obj):
if name.startswith("_"):
continue
log.debug("inspecting %s.%s", obj_klass_name, name)
try:
member = getattr(obj, name)
except:
log.info(
"failed to inspect member '%s.%s'", obj_klass_name, name)
log.debug("Details:", exc_info=1)
if inspect.isclass(member) or inspect.ismodule(member):
continue
if member_filter and not member_filter(obj, tango_class_name,
name, member):
log.debug("filtered out %s from %s", name, tango_class_name)
continue
if inspect.isroutine(member):
# try to find out if there are any parameters
in_type = CmdArgType.DevEncoded
out_type = CmdArgType.DevEncoded
try:
arg_spec = inspect.getargspec(member)
if not arg_spec.args:
in_type = CmdArgType.DevVoid
except TypeError:
pass
if in_type == CmdArgType.DevVoid:
def _command(dev, func_name=None):
obj = dev._object
f = getattr(obj, func_name)
result = server.worker.execute(f)
return server.dumps(result)
else:
def _command(dev, param, func_name=None):
obj = dev._object
args, kwargs = loads(*param)
f = getattr(obj, func_name)
result = server.worker.execute(f, *args, **kwargs)
return server.dumps(result)
cmd = functools.partial(_command, func_name=name)
cmd.__name__ = name
doc = member.__doc__
if doc is None:
doc = ""
cmd.__doc__ = doc
cmd = types.MethodType(cmd, None, DeviceDispatcher)
setattr(DeviceDispatcher, name, cmd)
DeviceDispatcherClass.cmd_list[name] = \
[[in_type, doc], [out_type, ""]]
else:
read_only = False
if hasattr(obj_klass, name):
kmember = getattr(obj_klass, name)
if inspect.isdatadescriptor(kmember):
if kmember.fset is None:
read_only = True
else:
continue
value = member
dtype, fmt, x, y = __to_tango_type_fmt(value)
if dtype is None or dtype == CmdArgType.DevEncoded:
dtype = CmdArgType.DevEncoded
fmt = AttrDataFormat.SCALAR
def read(dev, attr):
name = attr.get_name()
value = server.worker.execute(getattr, dev._object, name)
attr.set_value(*server.dumps(value))
def write(dev, attr):
name = attr.get_name()
value = attr.get_write_value()
value = loads(*value)
server.worker.execute(setattr, dev._object, name, value)
else:
def read(dev, attr):
name = attr.get_name()
value = server.worker.execute(getattr, dev._object, name)
attr.set_value(value)
def write(dev, attr):
name = attr.get_name()
value = attr.get_write_value()
server.worker.execute(setattr, dev._object, name, value)
read.__name__ = "_read_" + name
setattr(DeviceDispatcher, read.__name__, read)
pars = dict(name=name, dtype=dtype, dformat=fmt,
max_dim_x=x, max_dim_y=y, fget=read)
if not read_only:
write.__name__ = "_write_" + name
pars['fset'] = write
setattr(DeviceDispatcher, write.__name__, write)
attr_data = AttrData.from_dict(pars)
DeviceDispatcherClass.attr_list[name] = attr_data
return DeviceDispatcher
class Server:
"""
Server helper
"""
Phase0, Phase1, Phase2 = range(3)
PreInitPhase = Phase1
PostInitPhase = Phase2
class TangoObjectAdapter:
def __init__(self, server, obj, full_name, alias=None,
tango_class_name=None):
self.__server = weakref.ref(server)
self.full_name = full_name
self.alias = alias
self.class_name = obj.__class__.__name__
if tango_class_name is None:
tango_class_name = self.class_name
self.tango_class_name = tango_class_name
self.__object = weakref.ref(obj, self.__onObjectDeleted)
def __onObjectDeleted(self, object_weak):
self.__object = None
server = self._server
server.log.info("object deleted %s(%s)", self.class_name,
self.full_name)
server.unregister_object(self.full_name)
@property
def _server(self):
return self.__server()
@property
def _object(self):
obj = self.__object
if obj is None:
return None
return obj()
def __init__(self, server_name, server_type=None, port=None,
event_loop_callback=None, init_callbacks=None,
auto_clean=False, green_mode=None, tango_classes=None,
protocol="pickle"):
if server_name is None:
raise ValueError("Must give a valid server name")
self.__server_name = server_name
self.__server_type = server_type
self.__port = port
self.__event_loop_callback = event_loop_callback
if init_callbacks is None:
init_callbacks = {}
self.__init_callbacks = init_callbacks
self.__util = None
self.__objects = {}
self.__running = False
self.__auto_clean = auto_clean
self.__green_mode = green_mode
self.__protocol = protocol
self.__tango_classes = _to_classes(tango_classes or [])
self.__tango_devices = []
if self.async_mode:
self.__worker = get_executor(self.green_mode)
else:
self.__worker = get_worker()
set_worker(self.__worker)
self.log = logging.getLogger("tango.Server")
self.__phase = Server.Phase0
def __build_args(self):
args = [self.server_type, self.__server_name]
if self.__port is not None:
args.extend(["-ORBendPoint",
"giop:tcp::{0}".format(self.__port)])
return args
def __exec_cb(self, cb):
if not cb:
return
self.worker.execute(cb)
def __find_tango_class(self, key):
pass
def __prepare(self):
"""Update database with existing devices"""
self.log.debug("prepare")
if self.__phase > 0:
raise RuntimeError("Internal error: Can only prepare in phase 0")
server_instance = self.server_instance
db = Database()
# get list of server devices if server was already registered
server_registered = server_instance in db.get_server_list()
if server_registered:
dserver_name = "dserver/{0}".format(server_instance)
if db.import_device(dserver_name).exported:
import tango
dserver = tango.DeviceProxy(dserver_name)
try:
dserver.ping()
raise Exception("Server already running")
except:
self.log.info("Last time server was not properly "
"shutdown!")
_, db_device_map = self.get_devices()
else:
db_device_map = {}
db_devices_add = {}
# all devices that are registered in database that are not registered
# as tango objects or for which the tango class changed will be removed
db_devices_remove = set(db_device_map) - set(self.__objects)
for local_name, local_object in self.__objects.items():
local_class_name = local_object.tango_class_name
db_class_name = db_device_map.get(local_name)
if db_class_name:
if local_class_name != db_class_name:
db_devices_remove.add(local_name)
db_devices_add[local_name] = local_object
else:
db_devices_add[local_name] = local_object
for device in db_devices_remove:
db.delete_device(device)
try:
db.delete_device_alias(db.get_alias(device))
except:
pass
# register devices in database
# add DServer
db_dev_info = DbDevInfo()
db_dev_info.server = server_instance
db_dev_info._class = "DServer"
db_dev_info.name = "dserver/" + server_instance
db_dev_infos = [db_dev_info]
aliases = []
for obj_name, obj in db_devices_add.items():
db_dev_info = DbDevInfo()
db_dev_info.server = server_instance
db_dev_info._class = obj.tango_class_name
db_dev_info.name = obj.full_name
db_dev_infos.append(db_dev_info)
if obj.alias:
aliases.append((obj.full_name, obj.alias))
db.add_server(server_instance, db_dev_infos)
# add aliases
for alias_info in aliases:
db.put_device_alias(*alias_info)
def __clean_up_process(self):
if not self.__auto_clean:
return
clean_up = _CLEAN_UP_TEMPLATE.format(
server_instance=self.server_instance)
import subprocess
res = subprocess.call([sys.executable, "-c", clean_up])
if res:
self.log.error("Failed to cleanup")
def __initialize(self):
self.log.debug("initialize")
async_mode = self.async_mode
event_loop = self.__event_loop_callback
util = self.tango_util
u_instance = util.instance()
if async_mode:
if event_loop:
event_loop = functools.partial(self.worker.execute,
event_loop)
if event_loop:
u_instance.server_set_event_loop(event_loop)
_add_classes(util, self.__tango_classes)
def __run(self, timeout=None):
return self.worker.run(self.__tango_loop, wait=True, timeout=timeout)
def __tango_loop(self):
self.log.debug("server loop started")
self.__running = True
u_instance = self.tango_util.instance()
u_instance.server_init()
self._phase = Server.Phase2
self.log.info("Ready to accept request")
u_instance.server_run()
if self.__auto_clean:
self.__clean_up_process()
self.log.debug("server loop exit")
@property
def _phase(self):
return self.__phase
@_phase.setter
def _phase(self, phase):
self.__phase = phase
cb = self.__init_callbacks.get(phase)
self.__exec_cb(cb)
@property
def server_type(self):
server_type = self.__server_type
if server_type is None:
server_file = os.path.basename(sys.argv[0])
server_type = os.path.splitext(server_file)[0]
return server_type
@property
def server_instance(self):
return "{0}/{1}".format(self.server_type, self.__server_name)
@property
def tango_util(self):
if self.__util is None:
import tango
self.__util = tango.Util(self.__build_args())
self._phase = Server.Phase1
return self.__util
@property
def green_mode(self):
gm = self.__green_mode
if gm is None:
from tango import get_green_mode
gm = get_green_mode()
return gm
@green_mode.setter
def green_mode(self, gm):
if gm == self.__green_mode:
return
if self.__running:
raise RuntimeError("Cannot change green mode while "
"server is running")
self.__green_mode = gm
@property
def async_mode(self):
return self.green_mode in (GreenMode.Gevent, GreenMode.Asyncio)
@property
def worker(self):
return self.__worker
def dumps(self, obj):
return dumps(self.__protocol, obj)
def get_devices(self):
"""
Helper that retuns a dict of devices for this server.
:return:
Returns a tuple of two elements:
- dict<tango class name : list of device names>
- dict<device names : tango class name>
:rtype: tuple<dict, dict>
"""
if self.__util is None:
import tango
db = tango.Database()
else:
db = self.__util.get_database()
server = self.server_instance
dev_list = db.get_device_class_list(server)
class_map, dev_map = {}, {}
for class_name, dev_name in zip(dev_list[1::2], dev_list[::2]):
dev_names = class_map.get(class_name)
if dev_names is None:
class_map[class_name] = dev_names = []
dev_name = dev_name.lower()
dev_names.append(dev_name)
dev_map[dev_name] = class_name
return class_map, dev_map
def get_tango_object(self, name):
return self.__objects.get(name.lower())
def get_tango_class(self, tango_class_name):
for klass in self.__tango_classes:
if klass.TangoClassName == tango_class_name:
return klass
def register_tango_device(self, klass, name):
if inspect.isclass(klass):
if isinstance(klass, Device):
# TODO
raise NotImplementedError
else:
raise ValueError
else:
raise NotImplementedError
def register_tango_class(self, klass):
if self._phase > Server.Phase1:
raise RuntimeError("Cannot add new class after phase 1 "
"(i.e. after server_init)")
self.__tango_classes.append(klass)
def unregister_object(self, name):
tango_object = self.__objects.pop(name.lower())
if self._phase > Server.Phase1:
import tango
util = tango.Util.instance()
if not util.is_svr_shutting_down():
util.delete_device(tango_object.tango_class_name, name)
def register_object(self, obj, name, tango_class_name=None,
member_filter=None):
"""
:param member_filter:
callable(obj, tango_class_name, member_name, member) -> bool
"""
slash_count = name.count("/")
if slash_count == 0:
alias = name
full_name = "{0}/{1}".format(self.server_instance, name)
elif slash_count == 2:
alias = None
full_name = name
else:
raise ValueError("Invalid name")
class_name = tango_class_name or obj.__class__.__name__
tango_class = self.get_tango_class(class_name)
if tango_class is None:
tango_class = create_tango_class(self, obj, class_name,
member_filter=member_filter)
self.register_tango_class(tango_class)
tango_object = self.TangoObjectAdapter(self, obj, full_name, alias,
tango_class_name=class_name)
self.__objects[full_name.lower()] = tango_object
if self._phase > Server.Phase1:
import tango
util = tango.Util.instance()
util.create_device(class_name, name)
return tango_object
def run(self, timeout=None):
self.log.debug("run")
async_mode = self.async_mode
running = self.__running
if not running:
self.__prepare()
self.__initialize()
else:
if not async_mode:
raise RuntimeError("Server is already running")
self.__run(timeout=timeout)
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