# Copyright 2018-2023 Descartes Labs.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from enum import auto
from typing import Any, Dict, Tuple
from strenum import LowercaseStrEnum
from .attributes import Attribute
[docs]class DocumentState(LowercaseStrEnum):
MODIFIED = auto()
NEW = auto()
SAVED = auto()
DELETED = auto()
[docs]class Document(object):
"""An Object or Document in a Descartes Labs service."""
def __init__(self, saved=False, **kwargs) -> None:
self._attributes = dict()
self._modified = set()
if saved:
self._load_from_remote(kwargs)
else:
self._fill(kwargs, remote=saved)
self._saved = saved
self._deleted = False
def __getattribute__(self, name: str) -> Any:
try:
deleted = object.__getattribute__(self, "_deleted")
except AttributeError:
deleted = False
if deleted and name != "state" and not name.startswith("_"):
class_name = object.__getattribute__(self, "__class__").__name__
raise AttributeError(f"{class_name} has been deleted")
return object.__getattribute__(self, name)
def _clear_modified(self):
"""Clears the list of modified attributes."""
self._modified = set()
def _get_attributes(self) -> Dict[str, Attribute]:
"""Returns all of the Attributes in the document.
Returns
-------
Dict[str, Attribute]
The attribute instances in the document.
"""
return {
name: instance
for name, instance in vars(self.__class__).items()
if isinstance(instance, Attribute)
}
def _fill(self, data: dict, ignore_missing: bool = False, remote: bool = False):
"""Sets document attributes from a dictionary of data.
Parameters
----------
ignore_missing : bool, False
If set, unknown attributes will be ignored.
remote : bool, False
If set, the data is from the remote server.
Data provided in this way will set immutable and readonly attributes.
Additionally, the document will be forced into a `saved` status and
all modified fields will be cleared.
"""
attributes = self._get_attributes()
for key, value in data.items():
if ignore_missing and key not in attributes:
continue
attributes[key].__set__(self, value, force=remote)
if remote:
self._clear_modified()
self._saved = True
def _load_from_remote(self, data: dict):
"""Populates the document instance with data from the remote server.
Parameters
----------
data : dict
The response json to populate the document with.
"""
self._fill(data, ignore_missing=True, remote=True)
@classmethod
def _serialize_filter_attribute(cls, name: str, value: Any) -> Tuple[str, Any]:
"""Serializes a filter attribute.
Parameters
----------
name : str
The name of the attribute.
value : Any
The value of the attribute.
Returns
-------
Tuple[str, Any]
The serialized attribute name and value.
"""
attribute: Attribute = getattr(cls, name)
return (attribute.name, attribute._serialize_to_filter(value))
[docs] def update(self, ignore_missing=False, **kwargs):
"""Updates the document setting multiple attributes at a time.
Parameters
----------
ignore_missing : bool, False
If set, unknown attributes will be ignored.
"""
self._fill(kwargs, ignore_missing=ignore_missing)
@property
def state(self) -> DocumentState:
"""Returns the state of the current document instance.
Returns
-------
:py:class:`~descarteslabs.common.client.DocumentState`
"""
if self._deleted:
return DocumentState.DELETED
if not self._saved:
return DocumentState.NEW
if self.is_modified:
return DocumentState.MODIFIED
else:
return DocumentState.SAVED
@property
def is_modified(self) -> bool:
"""Determines if the document has been modified."""
return bool(self._modified)
[docs] def to_dict(
self,
only_modified: bool = False,
exclude_readonly: bool = False,
exclude_none: bool = False,
) -> Dict[str, Any]:
"""Converts the document to a dictionary.
Attributes will be serialized to JSON encodable types.
Parameters
----------
only_modified : bool, False
If set, only modified attributes and their values will be included.
exclude_readonly : bool, False
If set, readonly attributes and their values are excluded.
exclude_none : bool, False
If set, attributes with a value of None will be excluded.
Returns
-------
Dict[str, Any]
The attributes matching the call parameters. The result of this function
can be json encoded without modification.
"""
attributes = self._get_attributes()
data = {}
for key, attribute in attributes.items():
if exclude_readonly and attribute.readonly:
continue
if only_modified and key not in self._modified:
continue
value = getattr(self, key)
if exclude_none and value is None:
continue
if isinstance(value, Document):
value = value.to_dict(
only_modified=only_modified,
exclude_readonly=exclude_readonly,
exclude_none=exclude_none,
)
else:
value = attribute.serialize(value)
data[key] = value
return data
def __repr__(self) -> str:
attributes = self._get_attributes()
pairs = [
"{}={}".format(key, repr(getattr(self, key))) for key in attributes.keys()
]
return "{}({})".format(self.__class__.__name__, ", ".join(pairs))
