from typing import Union
from pathlib import Path
import importlib_resources
from contextlib import ExitStack
import atexit
import os
import openmdao.api as om
import numpy as np
from openmdao.utils.units import convert_units
from aviary.utils.aviary_values import AviaryValues, get_keys, get_items
from aviary.variable_info.enums import ProblemType, EquationsOfMotion, LegacyCode
from aviary.variable_info.functions import add_aviary_output, add_aviary_input
from aviary.variable_info.variable_meta_data import _MetaData
[docs]
class Null:
'''
This can be used to divert outputs, such as stdout, to improve performance
'''
[docs]
def write(self, *args, **kwargs):
pass
[docs]
def flush(self, *args, **kwargs):
pass
[docs]
def get_aviary_resource_path(resource_name: str) -> str:
"""
Get the file path of a resource in the Aviary package.
Args:
resource_name (str): The name of the resource.
Returns:
str: The file path of the resource.
"""
file_manager = ExitStack()
atexit.register(file_manager.close)
ref = importlib_resources.files('aviary') / resource_name
path = file_manager.enter_context(
importlib_resources.as_file(ref))
return path
[docs]
def set_aviary_initial_values(prob, aviary_inputs: AviaryValues):
"""
Sets initial values for all inputs in the aviary inputs.
This method is mostly used in tests and level 3 scripts.
Parameters
----------
prob : Problem
OpenMDAO problem after setup.
aviary_inputs : AviaryValues
Instance of AviaryValues containing all initial values.
"""
for (key, (val, units)) in get_items(aviary_inputs):
try:
prob.set_val(key, val, units)
except:
# Should be an option or an overridden output.
continue
[docs]
def convert_strings_to_data(string_list):
# convert_strings_to_data will convert a list of strings to usable data.
# Strings that can't be converted to numbers will attempt to store as a logical,
# otherwise they are passed as is
value_list = [0]*len(string_list)
for ii, dat in enumerate(string_list):
dat = dat.strip('[]')
try:
# if the value is a number store it as a float or an int as appropriate
# BUG this returns floats that can be converted to int (e.g. 1.0) as an int (1), even if the variable requires floats
value_list[ii] = int(float(dat)) if float(
dat).is_integer() else float(dat)
except ValueError:
# store value as a logical if it is a string that represents True or False
if dat.lower() == 'true':
value_list[ii] = True
elif dat.lower() == 'false':
value_list[ii] = False
else:
# if the value isn't a number or a logial, store it as a string
value_list[ii] = dat
except Exception as e:
print('Exception', e)
return value_list
[docs]
def set_value(var_name, var_value, aviary_values: AviaryValues, units=None, is_array=False, meta_data=_MetaData):
if var_name in aviary_values:
current_value, current_units = aviary_values.get_item(var_name)
else:
current_value = meta_data[var_name]['default_value']
current_units = meta_data[var_name]['units']
if units == None:
if current_units:
units = current_units
else:
units = meta_data[var_name]['units']
# raise ValueError("You have specified a new variable without any units")
if is_array:
var_value = np.atleast_1d(var_value)
elif len(var_value) == 1 and not isinstance(current_value, list):
# if only a single value is provided, don't store it as a list
var_value = var_value[0]
# TODO handle enums in an automated method via checking metadata for enum type
if var_name == 'settings:problem_type':
var_values = ProblemType(var_value)
if var_name == 'settings:equations_of_motion':
var_values = EquationsOfMotion(var_value)
if var_name == 'settings:mass_method':
var_values = LegacyCode(var_value)
aviary_values.set_val(var_name, val=var_value, units=units, meta_data=meta_data)
return aviary_values
[docs]
def create_opts2vals(all_options: list, output_units: dict = {}):
"""
create_opts2vals creates a component that converts options to outputs.
Parameters
----------
all_options : list of strings
Each string is the name of an option in aviary_options.
output_units : dict of units, optional
This optional input allows the user to specify the units that will be used while
adding the outputs. Only the outputs that shouldn't use their default units need
to be specified. Each key should match one of the names in all_options, and each
value must be a string representing a valid unit in openMDAO.
Returns
-------
OptionsToValues : ExplicitComponent
An explicit component that takes in an AviaryValues object that contains any
options that need to be converted to outputs. There are no inputs to this
component, only outputs. If the resulting component is added directly to a
Group, the output variables will have the same name as the options they
represent. If you need to rename them to prevent conflicting names in the
group, running add_opts2vals will add the prefix "option:" to the name.
"""
def configure_output(option_name: str, aviary_options: AviaryValues):
option_data = aviary_options.get_item(option_name)
out_units = output_units[option_name] if option_name in output_units.keys(
) else option_data[1]
return {'val': option_data[0], 'units': out_units}
class OptionsToValues(om.ExplicitComponent):
def initialize(self):
self.options.declare(
'aviary_options', types=AviaryValues,
desc='collection of Aircraft/Mission specific options'
)
def setup(self):
for option_name in all_options:
output_data = configure_output(
option_name, self.options['aviary_options'])
add_aviary_output(self, option_name,
val=output_data['val'], units=output_data['units'])
def compute(self, inputs, outputs):
aviary_options: AviaryValues = self.options['aviary_options']
for option_name in all_options:
output_data = configure_output(option_name, aviary_options)
outputs[option_name] = aviary_options.get_val(
option_name, units=output_data['units'])
return OptionsToValues
[docs]
def add_opts2vals(Group: om.Group, OptionsToValues, aviary_options: AviaryValues):
"""
Add the OptionsToValues component to the specified Group.
Parameters
----------
Group : Group
The group or model the component should be added to.
OptionsToValues : ExplicitComponent
This is the explicit component that was created by create_opts2vals.
aviary_options : AviaryValues
aviary_options is an AviaryValues object that contains all of the options
that need to be converted to outputs.
Returns
-------
Opts2Vals : Group
A group that wraps the OptionsToValues component in order to rename its
variables with a prefix to keep them separate from any similarly named
variables in the original group the component is being added to.
"""
class Opts2Vals(om.Group):
def initialize(self):
self.options.declare(
'aviary_options', types=AviaryValues,
desc='collection of Aircraft/Mission specific options'
)
def setup(self):
self.add_subsystem('options_to_values', OptionsToValues(
aviary_options=aviary_options))
def configure(self):
all_output_data = self.options_to_values.list_outputs(out_stream=None)
list_of_outputs = [(name, 'option:'+name) for name, data in all_output_data]
self.promotes('options_to_values', list_of_outputs)
Group.add_subsystem('opts2vals', Opts2Vals(
aviary_options=aviary_options),
promotes_outputs=['*'])
return Group
[docs]
def create_printcomp(all_inputs: list, input_units: dict = {}, meta_data=_MetaData):
"""
Creates a component that prints the value of all inputs.
Parameters
----------
all_inputs : list of strings
Each string is the name of a variable in the system
input_units : dict of units, optional
This optional input allows the user to specify the units that will be used while
adding the inputs. Only the variables that shouldn't use their default units need
to be specified. Each key should match one of the names in all_inputs, and each
value must be a string representing a valid unit in openMDAO.
Returns
-------
PrintComp : ExplicitComponent
An explicit component that can be added to a group to print the current values
of connected variables. There are no outputs from this component, only inputs.
"""
def get_units(variable_name):
if variable_name in input_units.keys():
return input_units[variable_name]
elif variable_name in meta_data:
return meta_data[variable_name]['units']
else:
return None
class PrintComp(om.ExplicitComponent):
def setup(self):
for variable_name in all_inputs:
units = get_units(variable_name)
if ':' in variable_name:
add_aviary_input(self, variable_name, units=units)
else:
# using an arbitrary number that will stand out for unconnected variables
self.add_input(variable_name, units=units, val=1.23456)
def compute(self, inputs, outputs):
print_string = ['v'*20]
for variable_name in all_inputs:
units = get_units(variable_name)
print_string.append('{} {} {}'.format(
variable_name, inputs[variable_name], units))
print_string.append('^'*20)
print('\n'.join(print_string))
return PrintComp
# Python 3.10 adds the ability to specify multiple types using type hints like so:
# "str | Path" which is cleaner but Aviary still supports older versions
[docs]
def get_model(file_name: str, verbose=False) -> Path:
'''
This function attempts to find the path to a file or folder in aviary/models
If the path cannot be found in any of the locations, a FileNotFoundError is raised.
Parameters
----------
path : str or Path
The input path, either as a string or a Path object.
Returns
-------
aviary_path
The absolute path to the file.
Raises
------
FileNotFoundError
If the path is not found.
'''
# Get the path to Aviary's models
path = Path('models', file_name)
aviary_path = Path(get_aviary_resource_path(str(path)))
# If the file name was provided without a path, check in the subfolders
if not aviary_path.exists():
sub_dirs = [x[0] for x in os.walk(get_aviary_resource_path('models'))]
for sub_dir in sub_dirs:
temp_path = Path(sub_dir, file_name)
if temp_path.exists():
# only return the first matching file
aviary_path = temp_path
continue
# If the path still doesn't exist, raise an error.
if not aviary_path.exists():
raise FileNotFoundError(
f"File or Folder not found in Aviary's hangar"
)
if verbose:
print('found', aviary_path, '\n')
return aviary_path
[docs]
def get_path(path: Union[str, Path], verbose: bool = False) -> Path:
"""
Convert a string or Path object to an absolute Path object, prioritizing different locations.
This function attempts to find the existence of a path in the following order:
1. As an absolute path.
2. Relative to the current working directory.
3. Relative to the Aviary package.
If the path cannot be found in any of the locations, a FileNotFoundError is raised.
Parameters
----------
path : str or Path
The input path, either as a string or a Path object.
verbose : bool, optional
If True, prints the final path being used. Default is False.
Returns
-------
Path
The absolute path to the file.
Raises
------
FileNotFoundError
If the path is not found in any of the prioritized locations.
"""
# Store the original path for reference in error messages.
original_path = path
# If the input is a string, convert it to a Path object.
if isinstance(path, str):
path = Path(path)
# Check if the path exists as an absolute path.
if not path.exists():
# If not, try finding the path relative to the current working directory.
relative_path = Path.cwd() / path
path = relative_path
# If the path still doesn't exist, attempt to find it relative to the Aviary package.
if not path.exists():
# Determine the path relative to the Aviary package.
aviary_based_path = Path(
get_aviary_resource_path(original_path))
if verbose:
print(
f"Unable to locate '{original_path}' as an absolute or relative path. Trying Aviary package path: {aviary_based_path}")
path = aviary_based_path
# If the path still doesn't exist, attempt to find it in the models directory.
if not path.exists():
try:
hangar_based_path = get_model(original_path)
if verbose:
print(
f"Unable to locate '{aviary_based_path}' as an Aviary package path, checking built-in models")
path = hangar_based_path
except FileNotFoundError:
pass
# If the path still doesn't exist in any of the prioritized locations, raise an error.
if not path.exists():
raise FileNotFoundError(
f'File not found in absolute path: {original_path}, relative path: '
f'{relative_path}, or Aviary-based path: '
f'{Path(get_aviary_resource_path(original_path))}'
)
# If verbose is True, print the path being used.
if verbose:
print(f'Using {path} for file.')
return path
[docs]
def wrapped_convert_units(val_unit_tuple, new_units):
"""
Wrapper for OpenMDAO's convert_units function.
Parameters
----------
val_unit_tuple : tuple
Tuple of the form (value, units) where value is a float and units is a
string.
new_units : string
New units to convert to.
Returns
-------
float
Value converted to new units.
"""
value, units = val_unit_tuple
# can't convert units on None; return None
if value is None:
return None
if isinstance(value, (list, tuple)):
return [convert_units(v, units, new_units) for v in value]
else:
return convert_units(value, units, new_units)
