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import abc
import copy
from typing import Any, Final, Optional
from moto.stepfunctions.parser.api import HistoryEventType, TaskFailedEventDetails
from moto.stepfunctions.parser.asl.component.common.error_name.failure_event import (
FailureEvent,
FailureEventException,
)
from moto.stepfunctions.parser.asl.component.common.error_name.states_error_name import (
StatesErrorName,
)
from moto.stepfunctions.parser.asl.component.common.error_name.states_error_name_type import (
StatesErrorNameType,
)
from moto.stepfunctions.parser.asl.component.common.query_language import (
QueryLanguageMode,
)
from moto.stepfunctions.parser.asl.component.eval_component import EvalComponent
from moto.stepfunctions.parser.asl.component.intrinsic.jsonata import (
get_intrinsic_functions_declarations,
)
from moto.stepfunctions.parser.asl.eval.environment import Environment
from moto.stepfunctions.parser.asl.eval.event.event_detail import EventDetails
from moto.stepfunctions.parser.asl.jsonata.jsonata import (
JSONataExpression,
VariableDeclarations,
VariableReference,
compose_jsonata_expression,
eval_jsonata_expression,
extract_jsonata_variable_references,
)
from moto.stepfunctions.parser.asl.jsonata.validations import (
validate_jsonata_expression_output,
)
from moto.stepfunctions.parser.asl.utils.encoding import to_json_str
from moto.stepfunctions.parser.asl.utils.json_path import (
NoSuchJsonPathError,
extract_json,
)
JSONPATH_ROOT_PATH: Final[str] = "$"
class StringExpression(EvalComponent, abc.ABC):
literal_value: Final[str]
def __init__(self, literal_value: str):
self.literal_value = literal_value
def _field_name(self) -> Optional[str]:
return None
class StringExpressionSimple(StringExpression, abc.ABC): ...
class StringSampler(StringExpressionSimple, abc.ABC): ...
class StringLiteral(StringExpression):
def _eval_body(self, env: Environment) -> None:
env.stack.append(self.literal_value)
class StringJsonPath(StringSampler):
json_path: Final[str]
def __init__(self, json_path: str):
super().__init__(literal_value=json_path)
self.json_path = json_path
def _eval_body(self, env: Environment) -> None:
input_value: Any = env.stack[-1]
if self.json_path == JSONPATH_ROOT_PATH:
output_value = input_value
else:
output_value = extract_json(self.json_path, input_value)
# TODO: introduce copy on write approach
env.stack.append(copy.deepcopy(output_value))
class StringContextPath(StringJsonPath):
context_object_path: Final[str]
def __init__(self, context_object_path: str):
json_path = context_object_path[1:]
super().__init__(json_path=json_path)
self.context_object_path = context_object_path
def _eval_body(self, env: Environment) -> None:
input_value = env.states.context_object.context_object_data
if self.json_path == JSONPATH_ROOT_PATH:
output_value = input_value
else:
try:
output_value = extract_json(self.json_path, input_value)
except NoSuchJsonPathError:
input_value_json_str = to_json_str(input_value)
cause = (
f"The JSONPath '${self.json_path}' specified for the field '{env.next_field_name}' "
f"could not be found in the input '{input_value_json_str}'"
)
raise FailureEventException(
failure_event=FailureEvent(
env=env,
error_name=StatesErrorName(
typ=StatesErrorNameType.StatesRuntime
),
event_type=HistoryEventType.TaskFailed,
event_details=EventDetails(
taskFailedEventDetails=TaskFailedEventDetails(
error=StatesErrorNameType.StatesRuntime.to_name(),
cause=cause,
)
),
)
)
# TODO: introduce copy on write approach
env.stack.append(copy.deepcopy(output_value))
class StringVariableSample(StringSampler):
query_language_mode: Final[QueryLanguageMode]
expression: Final[str]
def __init__(self, query_language_mode: QueryLanguageMode, expression: str):
super().__init__(literal_value=expression)
self.query_language_mode = query_language_mode
self.expression = expression
def _eval_body(self, env: Environment) -> None:
# Get the variables sampled in the jsonata expression.
expression_variable_references: set[VariableReference] = (
extract_jsonata_variable_references(self.expression)
)
variable_declarations_list = []
if self.query_language_mode == QueryLanguageMode.JSONata:
# Sample $states values into expression.
states_variable_declarations: VariableDeclarations = (
env.states.to_variable_declarations(
variable_references=expression_variable_references
)
)
variable_declarations_list.append(states_variable_declarations)
# Sample Variable store values in to expression.
# TODO: this could be optimised by sampling only those invoked.
variable_declarations: VariableDeclarations = (
env.variable_store.get_variable_declarations()
)
variable_declarations_list.append(variable_declarations)
rich_jsonata_expression: JSONataExpression = compose_jsonata_expression(
final_jsonata_expression=self.expression,
variable_declarations_list=variable_declarations_list,
)
result = eval_jsonata_expression(rich_jsonata_expression)
env.stack.append(result)
class StringIntrinsicFunction(StringExpressionSimple):
intrinsic_function_derivation: Final[str]
function: Final[EvalComponent]
def __init__(
self, intrinsic_function_derivation: str, function: EvalComponent
) -> None:
super().__init__(literal_value=intrinsic_function_derivation)
self.intrinsic_function_derivation = intrinsic_function_derivation
self.function = function
def _eval_body(self, env: Environment) -> None:
self.function.eval(env=env)
class StringJSONata(StringExpression):
expression: Final[str]
def __init__(self, expression: str):
super().__init__(literal_value=expression)
# TODO: check for illegal functions ($, $$, $eval)
self.expression = expression
def _eval_body(self, env: Environment) -> None:
# Get the variables sampled in the jsonata expression.
expression_variable_references: set[VariableReference] = (
extract_jsonata_variable_references(self.expression)
)
# Sample declarations for used intrinsic functions. Place this at the start allowing users to
# override these identifiers with custom variable declarations.
functions_variable_declarations: VariableDeclarations = (
get_intrinsic_functions_declarations(
variable_references=expression_variable_references
)
)
# Sample $states values into expression.
states_variable_declarations: VariableDeclarations = (
env.states.to_variable_declarations(
variable_references=expression_variable_references
)
)
# Sample Variable store values in to expression.
# TODO: this could be optimised by sampling only those invoked.
variable_declarations: VariableDeclarations = (
env.variable_store.get_variable_declarations()
)
rich_jsonata_expression: JSONataExpression = compose_jsonata_expression(
final_jsonata_expression=self.expression,
variable_declarations_list=[
functions_variable_declarations,
states_variable_declarations,
variable_declarations,
],
)
result = eval_jsonata_expression(rich_jsonata_expression)
validate_jsonata_expression_output(
env, self.expression, rich_jsonata_expression, result
)
env.stack.append(result)
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