from __future__ import annotations
from dataclasses import dataclass
from typing import Any, Generic, TypeVar
from tango import DeviceProxy
from tango.asyncio import DeviceProxy as AsyncDeviceProxy
from ophyd_async.core import Device, DeviceConnector, DeviceFiller, LazyMock
from ._signal import TangoSignalBackend, infer_python_type, infer_signal_type
from ._utils import get_full_attr_trl
T = TypeVar("T")
[docs]
class TangoDevice(Device):
"""General class for TangoDevices.
Extends Device to provide attributes for Tango devices.
:param trl: Tango resource locator, typically of the device server.
An asynchronous DeviceProxy object will be created using the
trl and awaited when the device is connected.
"""
trl: str = ""
proxy: DeviceProxy | None = None
def __init__(
self,
trl: str | None,
support_events: bool = False,
name: str = "",
auto_fill_signals: bool = True,
) -> None:
connector = TangoDeviceConnector(
trl=trl,
support_events=support_events,
auto_fill_signals=auto_fill_signals,
)
super().__init__(name=name, connector=connector)
[docs]
@dataclass
class TangoPolling(Generic[T]):
ophyd_polling_period: float = 0.1
abs_change: T | None = None
rel_change: T | None = None
def fill_backend_with_polling(
support_events: bool, backend: TangoSignalBackend, annotations: list[Any]
):
unhandled = []
while annotations:
annotation = annotations.pop(0)
backend.allow_events(support_events)
if isinstance(annotation, TangoPolling):
backend.set_polling(
not support_events,
annotation.ophyd_polling_period,
annotation.abs_change,
annotation.rel_change,
)
else:
unhandled.append(annotation)
annotations.extend(unhandled)
# These leftover annotations will now be handled by the iterator
[docs]
class TangoDeviceConnector(DeviceConnector):
def __init__(
self,
trl: str | None,
support_events: bool,
auto_fill_signals: bool = True,
) -> None:
self.trl = trl
self._support_events = support_events
self._auto_fill_signals = auto_fill_signals
[docs]
def create_children_from_annotations(self, device: Device):
if not hasattr(self, "filler"):
self.filler = DeviceFiller(
device=device,
signal_backend_factory=TangoSignalBackend,
device_connector_factory=lambda: TangoDeviceConnector(
None, self._support_events
),
)
list(self.filler.create_devices_from_annotations(filled=False))
for backend, annotations in self.filler.create_signals_from_annotations(
filled=False
):
fill_backend_with_polling(self._support_events, backend, annotations)
self.filler.check_created()
[docs]
async def connect_mock(self, device: Device, mock: LazyMock):
# Make 2 entries for each DeviceVector
self.filler.create_device_vector_entries_to_mock(2)
# Set the name of the device to name all children
device.set_name(device.name)
return await super().connect_mock(device, mock)
[docs]
async def connect_real(self, device: Device, timeout: float, force_reconnect: bool):
if not self.trl:
raise RuntimeError(f"Could not created Device Proxy for TRL {self.trl}")
self.proxy = await AsyncDeviceProxy(self.trl)
children = sorted(
set()
.union(self.proxy.get_attribute_list())
.union(self.proxy.get_command_list())
)
children = [
child for child in children if child not in self.filler.ignored_signals
]
not_filled = {unfilled for unfilled, _ in device.children()}
# If auto_fill_signals is True, fill all children inferred from the device
# else fill only the children that are annotated
for name in children:
if self._auto_fill_signals or name in not_filled:
# TODO: strip attribute name
full_trl = get_full_attr_trl(self.trl, name)
signal_type = await infer_signal_type(full_trl, self.proxy)
if signal_type:
backend = self.filler.fill_child_signal(name, signal_type)
# don't overlaod datatype if provided by annotation
if backend.datatype is None:
backend.datatype = await infer_python_type(full_trl, self.proxy)
backend.set_trl(full_trl)
# Check that all the requested children have been filled
self.filler.check_filled(f"{self.trl}: {children}")
# Set the name of the device to name all children
device.set_name(device.name)
return await super().connect_real(device, timeout, force_reconnect)
