"""Base class for recording data."""
import abc
import copy
import pandas
import warnings
from typing import Union, List, Optional, NamedTuple, Any
from cosapp.core.signal import Signal
from cosapp.core.eval_str import EvalString
from cosapp.utils.helpers import is_numerical, check_arg
from cosapp.utils.find_variables import SearchPattern, make_wishlist, find_variables
[docs]class SpecialColumns(NamedTuple):
section: str
status: str
code: str
reference: str
[docs]class BaseRecorder(abc.ABC):
"""Abstract base class for recorders.
Matching pattern are case sensitive and support the following special patterns:
======== ================================
Pattern Meaning
======== ================================
`*` matches everything
`?` matches any single character
`[seq]` matches any character in seq
`[!seq]` matches any character not in seq
======== ================================
Excluding pattern are shadowing includes one; e.g. if `includes='*port_in.*' and `excludes='*.Pt'`, for a port
having variables named `Tt` and `Pt`, only `Tt` will be recorded.
Parameters
----------
includes : str or list of str, optional
Variables matching these patterns will be included; default `'*'` (i.e. all variables).
excludes : str or list of str or None, optional
Variables matching these patterns will be excluded; default `None` (i.e. nothing is excluded).
numerical_only : bool, optional
Keep only numerical variables (i.e. number or numerical vector); default False.
section : str, optional
Current section name; default `''`.
precision : int, optional
Precision digits when writing floating point number; default 9 (i.e. 10 figures will be written).
hold : bool, optional
Append the new data or not; default `False`.
raw_output : bool, optional
Raw output; default `False`.
Signals
-------
state_recorded : Signal(time_ref: Union[float, str], status: str, error_code: str)
Signal emitted after `record_state` execution
cleared : Signal()
Signal emitted after `clear` execution
"""
SPECIALS = SpecialColumns(
section="Section", status="Status", code="Error code", reference="Reference"
)
paused = False # type: bool
def __init__(self,
includes: SearchPattern = "*",
excludes: Optional[SearchPattern] = None,
# metadata: Optional[SearchPattern] = None, # TODO?
numerical_only = False,
section = "",
precision = 9,
hold = False,
raw_output = False,
):
check_arg(raw_output, 'raw_output', bool)
check_arg(numerical_only, 'numerical_only', bool)
self.__includes = make_wishlist(includes, "includes") # type: List[str]
self.__excludes = make_wishlist(excludes, "excludes") # type: List[str]
self._numerical_only = numerical_only # type: bool
# self.__metadata = metadata # type: List[str]
self.__section = "" # type: str
self.section = section
self.__hold = False # type: bool
self.hold = hold
self.__precision = 9 # type: int
self.precision = precision
self._raw_output = raw_output # type: bool
self.__variables = None # type: Optional[List[str]]
self.__expressions = None # type: Optional[List[str]]
self._watch_object = None # type: Optional[cosapp.core.module.Module]
self._owner = None # type: Optional[str]
# Signal
self.state_recorded = Signal(
args=["time_ref", "status", "error_code"],
name="cosapp.recorders.recorder.BaseRecorder.state_recorded",
)
self.cleared = Signal(name="cosapp.recorders.recorder.BaseRecorder.cleared")
[docs] @classmethod
def extend(cls, recorder, includes: SearchPattern=[], excludes: SearchPattern=[]) -> "BaseRecorder":
"""
Factory returning a new recorder, with similar attributes as
`recorder`, but extended `includes` and `excludes` fields.
Parameters
----------
includes : str, list of str, or None, optional
Variables patterns extending `recorder` inclusion patterns; default `[]` (i.e. no change).
excludes : str, list of str, or None, optional
Variables patterns extending `recorder` exclusion patterns; default `[]` (i.e. no change).
"""
new = cls(
recorder.includes + make_wishlist(includes, "includes"),
recorder.excludes + make_wishlist(excludes, "excludes"),
recorder._numerical_only,
recorder.section,
recorder.precision,
recorder.hold,
recorder._raw_output,
)
new.watched_object = recorder.watched_object
return new
@property
def watched_object(self) -> "Optional[cosapp.core.module.Module]":
"""Module : The object from which data are read."""
return self._watch_object
@watched_object.setter
def watched_object(self, module: "cosapp.core.module.Module"):
from cosapp.core.module import Module
if not (module is None or isinstance(module, Module)):
typename = type(module).__qualname__
raise TypeError(
f"Recorder must be attached to a System or a Driver; got {typename}."
)
is_new = module is not self._watch_object
if self._watch_object is None or is_new:
self.__variables = None
self.__expressions = None
self._watch_object = module
@property
@abc.abstractmethod
def _raw_data(self) -> List[List[Any]]:
"""Returns a raw/unformated version of records.
Returns
-------
List[List[Any]]
Records of `watched_object` for variables given by method `field_names()`
"""
pass
@property
def data(self) -> pandas.DataFrame:
"""
pandas.DataFrame: DataFrame containing the results.
Deprecated property; use `export_data()` instead.
"""
warnings.warn(
"Deprecated property; use export_data() instead",
DeprecationWarning
)
return self.export_data()
[docs] @abc.abstractmethod
def export_data(self) -> pandas.DataFrame:
"""Export recorded results into a pandas.DataFrame object."""
pass
@property
def includes(self) -> List[str]:
"""str or list of str : Variables matching these patterns will be included."""
return self.__includes
@property
def excludes(self) -> List[str]:
"""str or list of str: Variables matching these patterns will be excluded."""
return self.__excludes
@property
def section(self) -> str:
"""str : Current section name."""
return self.__section
@section.setter
def section(self, section: str):
check_arg(section, 'section', str)
self.__section = section
@property
def hold(self) -> bool:
"""bool : Append the new data or not."""
return self.__hold
@hold.setter
def hold(self, value: bool):
check_arg(value, 'hold', bool)
self.__hold = value
@property
def precision(self) -> int:
"""int : Precision digits when writing floating point number."""
return self.__precision
@precision.setter
def precision(self, value: int):
check_arg(value, 'precision', int, lambda n: n > 0)
self.__precision = value
[docs] def field_names(self) -> List[str]:
"""Returns list of requested variables and expressions.
Returns
-------
List[str]
Variable names matching the includes/excludes patterns of the user in the watched object.
.. note::
Inward and outward variables will appear without the prefix `inwards.` or `outwards.`.
"""
if self.__variables is None and self.watched_object is not None:
self.__update_varlist()
return self.__variables or list()
def __contains__(self, field: str) -> bool:
return field in self.field_names()
def __update_varlist(self) -> None:
"""Update the list of fields to be recorded"""
includes = []
evaluables = []
context = self.watched_object
for expression in set(self.__includes):
try:
EvalString(expression, context)
except:
includes.append(expression)
else:
if expression in context:
# Keep expression in search list,
# in case it matches an exclusion pattern
includes.append(expression)
else:
evaluables.append(expression)
if self._numerical_only:
filter = lambda x: is_numerical(x)
else:
filter = lambda x: True
variables = find_variables(
context,
includes,
self.__excludes,
advanced_filter=filter,
)
variables.extend(evaluables)
self.__variables = variables = sorted(variables)
self.__expressions = EvalString(", ".join(variables).join("[]"), context)
def _get_units(self, varnames: Optional[List[str]] = None) -> List[str]:
"""Generate the list of units associated with the requested variables.
Parameters
----------
vars : list of str, optional
List of the variables to get the units; if not provided, takes field_names
Returns
-------
List[str]
Variable units for the variables matching the includes/excludes patterns of the user.
"""
if varnames is None:
varnames = self.field_names()
units = list()
if self.watched_object is not None:
name2variable = self.watched_object.name2variable
for name in varnames:
try:
ref = name2variable[name]
details = ref.mapping.get_details(ref.key)
unit = details.unit
except:
unit = None
units.append(unit or "-")
return units
[docs] def start(self):
"""Initialize recording support."""
if self.watched_object is None:
raise RuntimeError("A recorder should be watching a Driver.")
[docs] def record_state(self, time_ref: Union[float, str], status="", error_code="0") -> None:
"""Record the watched object at the provided status.
Parameters
----------
time_ref : float or str
Current simulation time (float) or point reference (str)
status : str, optional
Status of the simulation; default `''`.
error_code : str, optional
Error code; default `'0'`.
"""
if self.paused:
return
line = [self.section, status, error_code, str(time_ref)] + self.formatted_data()
self._record(line)
self.state_recorded.emit(time_ref=time_ref, status=status, error_code=error_code)
[docs] def collected_data(self) -> List[Any]:
"""Collects and returns recorded data from watched object as a list."""
if self.__expressions is None:
self.__update_varlist()
return self.__expressions.eval()
@abc.abstractmethod
def _record(self, line: List[Any]) -> None:
"""
Internally record data collected into list `line`.
Required by `record_state` method.
"""
pass
[docs] def clear(self):
"""Clear all previously stored data."""
self.cleared.emit()
[docs] @abc.abstractmethod
def exit(self):
"""Close recording session."""
pass
[docs] def restore(self, index: int):
"""Restore the watch object state from the recorded data.
Parameters
----------
index : int
Index of the record as iloc in the Pandas DataFrame
"""
check_arg(index, 'index', int)
data = self._raw_data
if index < 0 or index > len(data) - 1:
raise IndexError(f"Index {index} does not exist in this Recorder")
inputs = find_variables(
self._watch_object, includes=["*"], excludes=[], outputs=False
)
recording = data[index][4:]
for idx, var in [
(idx, var)
for idx, var in enumerate(self.field_names())
if var in inputs
]:
try:
self._watch_object[var] = copy.deepcopy(recording[idx])
except KeyError:
pass
[docs] def check(self) -> None:
try:
self.formatted_data()
except Exception as ex:
warnings.warn(
f"Captured exception {ex!r} while trying to collect data in {self.watched_object}"
"; recorder may fail.",
RuntimeWarning
)
