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"""Usage docs: https://docs.pydantic.dev/2.7/concepts/plugins#build-a-plugin
Plugin interface for Pydantic plugins, and related types.
"""
from __future__ import annotations
from typing import Any, Callable, NamedTuple
from pydantic_core import CoreConfig, CoreSchema, ValidationError
from typing_extensions import Literal, Protocol, TypeAlias
__all__ = (
'PydanticPluginProtocol',
'BaseValidateHandlerProtocol',
'ValidatePythonHandlerProtocol',
'ValidateJsonHandlerProtocol',
'ValidateStringsHandlerProtocol',
'NewSchemaReturns',
'SchemaTypePath',
'SchemaKind',
)
NewSchemaReturns: TypeAlias = 'tuple[ValidatePythonHandlerProtocol | None, ValidateJsonHandlerProtocol | None, ValidateStringsHandlerProtocol | None]'
class SchemaTypePath(NamedTuple):
"""Path defining where `schema_type` was defined, or where `TypeAdapter` was called."""
module: str
name: str
SchemaKind: TypeAlias = Literal['BaseModel', 'TypeAdapter', 'dataclass', 'create_model', 'validate_call']
class PydanticPluginProtocol(Protocol):
"""Protocol defining the interface for Pydantic plugins."""
def new_schema_validator(
self,
schema: CoreSchema,
schema_type: Any,
schema_type_path: SchemaTypePath,
schema_kind: SchemaKind,
config: CoreConfig | None,
plugin_settings: dict[str, object],
) -> tuple[
ValidatePythonHandlerProtocol | None, ValidateJsonHandlerProtocol | None, ValidateStringsHandlerProtocol | None
]:
"""This method is called for each plugin every time a new [`SchemaValidator`][pydantic_core.SchemaValidator]
is created.
It should return an event handler for each of the three validation methods, or `None` if the plugin does not
implement that method.
Args:
schema: The schema to validate against.
schema_type: The original type which the schema was created from, e.g. the model class.
schema_type_path: Path defining where `schema_type` was defined, or where `TypeAdapter` was called.
schema_kind: The kind of schema to validate against.
config: The config to use for validation.
plugin_settings: Any plugin settings.
Returns:
A tuple of optional event handlers for each of the three validation methods -
`validate_python`, `validate_json`, `validate_strings`.
"""
raise NotImplementedError('Pydantic plugins should implement `new_schema_validator`.')
class BaseValidateHandlerProtocol(Protocol):
"""Base class for plugin callbacks protocols.
You shouldn't implement this protocol directly, instead use one of the subclasses with adds the correctly
typed `on_error` method.
"""
on_enter: Callable[..., None]
"""`on_enter` is changed to be more specific on all subclasses"""
def on_success(self, result: Any) -> None:
"""Callback to be notified of successful validation.
Args:
result: The result of the validation.
"""
return
def on_error(self, error: ValidationError) -> None:
"""Callback to be notified of validation errors.
Args:
error: The validation error.
"""
return
def on_exception(self, exception: Exception) -> None:
"""Callback to be notified of validation exceptions.
Args:
exception: The exception raised during validation.
"""
return
class ValidatePythonHandlerProtocol(BaseValidateHandlerProtocol, Protocol):
"""Event handler for `SchemaValidator.validate_python`."""
def on_enter(
self,
input: Any,
*,
strict: bool | None = None,
from_attributes: bool | None = None,
context: dict[str, Any] | None = None,
self_instance: Any | None = None,
) -> None:
"""Callback to be notified of validation start, and create an instance of the event handler.
Args:
input: The input to be validated.
strict: Whether to validate the object in strict mode.
from_attributes: Whether to validate objects as inputs by extracting attributes.
context: The context to use for validation, this is passed to functional validators.
self_instance: An instance of a model to set attributes on from validation, this is used when running
validation from the `__init__` method of a model.
"""
pass
class ValidateJsonHandlerProtocol(BaseValidateHandlerProtocol, Protocol):
"""Event handler for `SchemaValidator.validate_json`."""
def on_enter(
self,
input: str | bytes | bytearray,
*,
strict: bool | None = None,
context: dict[str, Any] | None = None,
self_instance: Any | None = None,
) -> None:
"""Callback to be notified of validation start, and create an instance of the event handler.
Args:
input: The JSON data to be validated.
strict: Whether to validate the object in strict mode.
context: The context to use for validation, this is passed to functional validators.
self_instance: An instance of a model to set attributes on from validation, this is used when running
validation from the `__init__` method of a model.
"""
pass
StringInput: TypeAlias = 'dict[str, StringInput]'
class ValidateStringsHandlerProtocol(BaseValidateHandlerProtocol, Protocol):
"""Event handler for `SchemaValidator.validate_strings`."""
def on_enter(
self, input: StringInput, *, strict: bool | None = None, context: dict[str, Any] | None = None
) -> None:
"""Callback to be notified of validation start, and create an instance of the event handler.
Args:
input: The string data to be validated.
strict: Whether to validate the object in strict mode.
context: The context to use for validation, this is passed to functional validators.
"""
pass
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