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errors.py
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errors.py
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""" This module contains the error-related constants and classes. """
from abc import ABC, abstractmethod
from collections import defaultdict
from copy import copy, deepcopy
from pprint import pformat
from typing import (
TYPE_CHECKING,
cast,
Any,
MutableMapping,
Optional,
Dict,
Union,
Iterator,
Iterable,
)
from typing import DefaultDict
from cerberus.typing import DocumentPath, FieldName
from cerberus.utils import compare_paths_lt, quote_string
if TYPE_CHECKING:
from cerberus.base import UnconcernedValidator # noqa: F401
class ErrorDefinition:
"""
This class is used to define possible errors. Each distinguishable error is
defined by a *unique* error ``code`` as integer and the ``rule`` that can
cause it as string.
The instances' names do not contain a common prefix as they are supposed to be
referenced within the module namespace, e.g. ``errors.CUSTOM``.
"""
__slots__ = ('code', 'rule')
def __init__(self, code: int, rule: Optional[str]) -> None:
self.code = code
self.rule = rule
# custom
CUSTOM = ErrorDefinition(0x00, None)
# existence
DOCUMENT_MISSING = ErrorDefinition(0x01, None) # issues/141
DOCUMENT_MISSING = "document is missing" # type: ignore
REQUIRED_FIELD = ErrorDefinition(0x02, 'required')
UNKNOWN_FIELD = ErrorDefinition(0x03, None)
DEPENDENCIES_FIELD = ErrorDefinition(0x04, 'dependencies')
DEPENDENCIES_FIELD_VALUE = ErrorDefinition(0x05, 'dependencies')
EXCLUDES_FIELD = ErrorDefinition(0x06, 'excludes')
# shape
DOCUMENT_FORMAT = ErrorDefinition(0x21, None) # issues/141
DOCUMENT_FORMAT = "'{0}' is not a document, must be a dict" # type: ignore
EMPTY = ErrorDefinition(0x22, 'empty')
NULLABLE = ErrorDefinition(0x23, 'nullable')
TYPE = ErrorDefinition(0x24, 'type')
ITEMS_LENGTH = ErrorDefinition(0x26, 'items')
MIN_LENGTH = ErrorDefinition(0x27, 'minlength')
MAX_LENGTH = ErrorDefinition(0x28, 'maxlength')
# color
REGEX_MISMATCH = ErrorDefinition(0x41, 'regex')
MIN_VALUE = ErrorDefinition(0x42, 'min')
MAX_VALUE = ErrorDefinition(0x43, 'max')
UNALLOWED_VALUE = ErrorDefinition(0x44, 'allowed')
UNALLOWED_VALUES = ErrorDefinition(0x45, 'allowed')
FORBIDDEN_VALUE = ErrorDefinition(0x46, 'forbidden')
FORBIDDEN_VALUES = ErrorDefinition(0x47, 'forbidden')
MISSING_MEMBERS = ErrorDefinition(0x48, 'contains')
# other
NORMALIZATION = ErrorDefinition(0x60, None)
COERCION_FAILED = ErrorDefinition(0x61, 'coerce')
RENAMING_FAILED = ErrorDefinition(0x62, 'rename_handler')
READONLY_FIELD = ErrorDefinition(0x63, 'readonly')
SETTING_DEFAULT_FAILED = ErrorDefinition(0x64, 'default_setter')
# groups
ERROR_GROUP = ErrorDefinition(0x80, None)
SCHEMA = ErrorDefinition(0x81, 'schema')
ITEMSRULES = ErrorDefinition(0x82, 'itemsrules')
KEYSRULES = ErrorDefinition(0x83, 'keysrules')
VALUESRULES = ErrorDefinition(0x84, 'valuesrules')
ITEMS = ErrorDefinition(0x8F, 'items')
LOGICAL = ErrorDefinition(0x90, None)
NONEOF = ErrorDefinition(0x91, 'noneof')
ONEOF = ErrorDefinition(0x92, 'oneof')
ANYOF = ErrorDefinition(0x93, 'anyof')
ALLOF = ErrorDefinition(0x94, 'allof')
""" SchemaError messages """
MISSING_SCHEMA = "validation schema missing"
SCHEMA_TYPE = "schema definition for field '{0}' must be a dict"
""" Error representations """
class ValidationError:
""" A simple class to store and query basic error information. """
def __init__(
self,
document_path: DocumentPath,
schema_path: DocumentPath,
code: int,
rule: str,
constraint: Any,
value: Any,
info: Any,
) -> None:
self.document_path = document_path
""" The path to the field within the document that caused the error.
Type: :class:`tuple` """
self.schema_path = schema_path
""" The path to the rule within the schema that caused the error.
Type: :class:`tuple` """
self.code = code
""" The error's identifier code. Type: :class:`int` """
self.rule = rule
""" The rule that failed. Type: `string` """
self.constraint = constraint
""" The constraint that failed. """
self.value = value
""" The value that failed. """
self.info = info
""" May hold additional information about the error.
Type: :class:`tuple` """
def __eq__(self, other):
""" Assumes the errors relate to the same document and schema. """
return hash(self) == hash(other)
def __hash__(self):
""" Expects that all other properties are transitively determined. """
return hash(self.document_path) ^ hash(self.schema_path) ^ hash(self.code)
def __lt__(self, other):
if self.document_path != other.document_path:
return compare_paths_lt(self.document_path, other.document_path)
else:
return compare_paths_lt(self.schema_path, other.schema_path)
def __repr__(self):
return (
"{class_name} @ {memptr} ( "
"document_path={document_path},"
"schema_path={schema_path},"
"code={code},"
"constraint={constraint},"
"value={value},"
"info={info} )".format(
class_name=self.__class__.__name__,
memptr=hex(id(self)), # noqa: E501
document_path=self.document_path,
schema_path=self.schema_path,
code=hex(self.code),
constraint=quote_string(self.constraint),
value=quote_string(self.value),
info=self.info,
)
)
@property
def child_errors(self) -> Optional["ErrorList"]:
"""
A list that contains the individual errors of a bulk validation error.
"""
return self.info[0] if self.is_group_error else None
@property
def definitions_errors(self) -> Optional[DefaultDict[int, "ErrorList"]]:
"""
Dictionary with errors of an *of-rule mapped to the index of the definition it
occurred in. Returns :obj:`None` if not applicable.
"""
if not self.is_logic_error:
return None
result = defaultdict(ErrorList) # type: DefaultDict[int, ErrorList]
for error in self.child_errors: # type: ignore
i = error.schema_path[len(self.schema_path)]
result[i].append(error)
return result
@property
def field(self) -> Optional[FieldName]:
""" Field of the contextual mapping, possibly :obj:`None`. """
if self.document_path:
return self.document_path[-1]
else:
return None
@property
def is_group_error(self) -> bool:
""" ``True`` for errors of bulk validations. """
return bool(self.code & ERROR_GROUP.code)
@property
def is_logic_error(self) -> bool:
""" ``True`` for validation errors against different schemas with
*of-rules. """
return bool(self.code & LOGICAL.code - ERROR_GROUP.code)
@property
def is_normalization_error(self) -> bool:
""" ``True`` for normalization errors. """
return bool(self.code & NORMALIZATION.code)
class ErrorList(list):
""" A list for :class:`~cerberus.errors.ValidationError` instances that
can be queried with the ``in`` keyword for a particular
:class:`~cerberus.errors.ErrorDefinition`. """
def __contains__(self, error_definition):
if not isinstance(error_definition, ErrorDefinition):
raise TypeError
wanted_code = error_definition.code
return any(x.code == wanted_code for x in self)
class ErrorTreeNode(MutableMapping):
__slots__ = ('descendants', 'errors', 'parent_node', 'path', 'tree_root')
def __init__(self, path: DocumentPath, parent_node: 'ErrorTreeNode') -> None:
self.parent_node = parent_node # type: Optional[ErrorTreeNode]
self.tree_root = self.parent_node.tree_root # type: ErrorTree
self.path = path[: self.parent_node.depth + 1]
self.errors = ErrorList()
self.descendants = {} # type: Dict[FieldName, ErrorTreeNode]
def __contains__(self, item):
if isinstance(item, ErrorDefinition):
return item in self.errors
else:
return item in self.descendants
def __delitem__(self, key):
del self.descendants[key]
def __iter__(self) -> Iterator[ValidationError]:
return iter(self.errors)
def __getitem__(
self, item: Union[ErrorDefinition, FieldName]
) -> Union[Optional[ValidationError], Optional['ErrorTreeNode']]:
if isinstance(item, ErrorDefinition):
for error in self.errors:
if item.code == error.code:
return error
return None
else:
return self.descendants.get(item)
def __len__(self):
return len(self.errors)
def __repr__(self):
return self.__str__()
def __setitem__(self, key: FieldName, value: "ErrorTreeNode") -> None:
self.descendants[key] = value
def __str__(self):
return str(self.errors) + ',' + str(self.descendants)
@property
def depth(self) -> int:
return len(self.path)
@property
def tree_type(self) -> str:
return self.tree_root.tree_type
def add(self, error: ValidationError) -> None:
error_path = self._path_of_(error)
key = error_path[self.depth]
if key not in self.descendants:
self[key] = ErrorTreeNode(error_path, self)
node = cast(ErrorTreeNode, self[key])
if len(error_path) == self.depth + 1:
node.errors.append(error)
node.errors.sort()
if error.is_group_error:
for child_error in error.child_errors: # type: ignore
self.tree_root.add(child_error)
else:
node.add(error)
def _path_of_(self, error):
return getattr(error, self.tree_type + '_path')
class ErrorTree(ErrorTreeNode):
""" Base class for :class:`~cerberus.errors.DocumentErrorTree` and
:class:`~cerberus.errors.SchemaErrorTree`. """
depth = 0
parent = None
path = ()
def __init__(self, errors: Iterable[ValidationError] = ()) -> None:
self.tree_root = self
self.errors = ErrorList()
self.descendants = {}
for error in errors:
self.add(error)
def add(self, error: ValidationError) -> None:
""" Add an error to the tree. """
if not self._path_of_(error):
self.errors.append(error)
self.errors.sort()
else:
super().add(error)
def fetch_errors_from(self, path: DocumentPath) -> ErrorList:
""" Returns all errors for a particular path. """
node = self.fetch_node_from(path)
if node is None:
return ErrorList()
else:
return node.errors
def fetch_node_from(self, path: DocumentPath) -> ErrorTreeNode:
""" Returns a node for a path. """
context = self
for key in path:
context = context.get(key, None)
if context is None:
break
return context
class DocumentErrorTree(ErrorTree):
""" Implements a dict-like class to query errors by indexes following the
structure of a validated document. """
tree_type = 'document'
class SchemaErrorTree(ErrorTree):
""" Implements a dict-like class to query errors by indexes following the
structure of the used schema. """
tree_type = 'schema'
class BaseErrorHandler(ABC):
""" Base class for all error handlers. """
def __init__(self, *args, **kwargs):
""" Optionally initialize a new instance. """
pass
@abstractmethod
def __call__(self, errors: Iterable[ValidationError]) -> Any:
""" Returns errors in a handler-specific format. """
raise NotImplementedError
def __iter__(self) -> Iterator[Any]:
""" Be a superhero and implement an iterator over errors. """
raise NotImplementedError
@abstractmethod
def add(self, error: ValidationError) -> None:
""" Add an error to the errors' container object of a handler.
:param error: The error to add.
"""
pass
def emit(self, error: ValidationError) -> None:
""" Optionally emits an error in the handler's format to a stream.
Or light a LED, or even shut down a power plant.
:param error: The error to emit.
"""
pass
def end(self, validator: "UnconcernedValidator") -> None:
""" Gets called when a validation ends.
:param validator: The calling validator.
"""
pass
def extend(self, errors: Iterable[ValidationError]) -> None:
""" Adds all errors to the handler's container object. """
for error in errors:
self.add(error)
def start(self, validator: "UnconcernedValidator") -> None:
""" Gets called when a validation starts.
:param validator: The calling validator.
"""
pass
class ToyErrorHandler(BaseErrorHandler):
def __call__(self, *args, **kwargs):
raise RuntimeError('This is not supposed to happen.')
add = __call__
class BasicErrorHandler(BaseErrorHandler):
""" Models cerberus' legacy. Returns a :class:`dict`. When mangled
through :class:`str` a pretty-formatted representation of that
tree is returned.
"""
messages = {
0x00: "{0}",
0x01: "document is missing",
0x02: "required field",
0x03: "unknown field",
0x04: "field '{0}' is required",
0x05: "depends on these values: {constraint}",
0x06: "{0} must not be present with '{field}'",
0x21: "'{0}' is not a document, must be a dict",
0x22: "empty values not allowed",
0x23: "null value not allowed",
0x24: "must be one of these types: {constraint}",
0x26: "length of list should be {0}, it is {1}",
0x27: "min length is {constraint}",
0x28: "max length is {constraint}",
0x41: "value does not match regex '{constraint}'",
0x42: "min value is {constraint}",
0x43: "max value is {constraint}",
0x44: "unallowed value {value}",
0x45: "unallowed values {0}",
0x46: "unallowed value {value}",
0x47: "unallowed values {0}",
0x48: "missing members {0}",
0x61: "field '{field}' cannot be coerced: {0}",
0x62: "field '{field}' cannot be renamed: {0}",
0x63: "field is read-only",
0x64: "default value for '{field}' cannot be set: {0}",
0x81: "mapping doesn't validate subschema: {0}",
0x82: "one or more sequence-items don't validate: {0}",
0x83: "one or more keys of a mapping don't validate: {0}",
0x84: "one or more values in a mapping don't validate: {0}",
0x85: "one or more sequence-items don't validate: {0}",
0x91: "one or more definitions validate",
0x92: "none or more than one rule validate",
0x93: "no definitions validate",
0x94: "one or more definitions don't validate",
}
def __init__(self, tree: Dict = None) -> None:
self.tree = {} if tree is None else tree
def __call__(self, errors):
self.clear()
self.extend(errors)
return self.pretty_tree
def __str__(self):
return pformat(self.pretty_tree)
@property
def pretty_tree(self) -> Dict:
pretty = deepcopy(self.tree)
for field in pretty:
self._purge_empty_dicts(pretty[field])
return pretty
def add(self, error):
# Make sure the original error is not altered with
# error paths specific to the handler.
error = deepcopy(error)
self._rewrite_error_path(error)
if error.is_logic_error:
self._insert_logic_error(error)
elif error.is_group_error:
self._insert_group_error(error)
elif error.code in self.messages:
self._insert_error(
error.document_path, self._format_message(error.field, error)
)
def clear(self):
self.tree = {}
def start(self, validator):
self.clear()
def _format_message(self, field, error):
return self.messages[error.code].format(
*error.info, constraint=error.constraint, field=field, value=error.value
)
def _insert_error(self, path, node):
""" Adds an error or sub-tree to :attr:tree.
:param path: Path to the error.
:type path: Tuple of strings and integers.
:param node: An error message or a sub-tree.
:type node: String or dictionary.
"""
field = path[0]
if len(path) == 1:
if field in self.tree:
subtree = self.tree[field].pop()
self.tree[field] += [node, subtree]
else:
self.tree[field] = [node, {}]
elif len(path) >= 1:
if field not in self.tree:
self.tree[field] = [{}]
subtree = self.tree[field][-1]
if subtree:
new = self.__class__(tree=copy(subtree))
else:
new = self.__class__()
new._insert_error(path[1:], node)
subtree.update(new.tree)
def _insert_group_error(self, error):
for child_error in error.child_errors:
if child_error.is_logic_error:
self._insert_logic_error(child_error)
elif child_error.is_group_error:
self._insert_group_error(child_error)
else:
self._insert_error(
child_error.document_path,
self._format_message(child_error.field, child_error),
)
def _insert_logic_error(self, error):
field = error.field
self._insert_error(error.document_path, self._format_message(field, error))
for definition_errors in error.definitions_errors.values():
for child_error in definition_errors:
if child_error.is_logic_error:
self._insert_logic_error(child_error)
elif child_error.is_group_error:
self._insert_group_error(child_error)
else:
self._insert_error(
child_error.document_path,
self._format_message(field, child_error),
)
def _purge_empty_dicts(self, error_list):
subtree = error_list[-1]
if not error_list[-1]:
error_list.pop()
else:
for key in subtree:
self._purge_empty_dicts(subtree[key])
def _rewrite_error_path(self, error, offset=0):
"""
Recursively rewrites the error path to correctly represent logic errors
"""
if error.is_logic_error:
self._rewrite_logic_error_path(error, offset)
elif error.is_group_error:
self._rewrite_group_error_path(error, offset)
def _rewrite_group_error_path(self, error, offset=0):
child_start = len(error.document_path) - offset
for child_error in error.child_errors:
relative_path = child_error.document_path[child_start:]
child_error.document_path = error.document_path + relative_path
self._rewrite_error_path(child_error, offset)
def _rewrite_logic_error_path(self, error, offset=0):
child_start = len(error.document_path) - offset
for i, definition_errors in error.definitions_errors.items():
if not definition_errors:
continue
nodename = '%s definition %s' % (error.rule, i)
path = error.document_path + (nodename,)
for child_error in definition_errors:
rel_path = child_error.document_path[child_start:]
child_error.document_path = path + rel_path
self._rewrite_error_path(child_error, offset + 1)
class SchemaErrorHandler(BasicErrorHandler):
messages = BasicErrorHandler.messages.copy()
messages[0x03] = "unknown rule"