Source code for flytekit.core.reference_entity

from abc import ABC, abstractmethod
from dataclasses import dataclass
from typing import Any, Dict, Optional, Tuple, Type, Union

from flytekit.common.exceptions import user as _user_exceptions
from flytekit.core.context_manager import BranchEvalMode, ExecutionState, FlyteContext
from flytekit.core.interface import Interface, transform_interface_to_typed_interface
from flytekit.core.promise import (
from flytekit.core.type_engine import TypeEngine
from flytekit.loggers import logger
from flytekit.models import interface as _interface_models
from flytekit.models import literals as _literal_models
from flytekit.models.core import identifier as _identifier_model
from flytekit.models.core import workflow as _workflow_model

class Reference(ABC):
    project: str
    domain: str
    name: str
    version: str

    def __post_init__(self):
        self._id = _identifier_model.Identifier(self.resource_type, self.project, self.domain,, self.version)

    def id(self) -> _identifier_model.Identifier:
        return self._id

    def resource_type(self) -> int:

[docs]@dataclass class TaskReference(Reference): @property def resource_type(self) -> int: return _identifier_model.ResourceType.TASK
[docs]@dataclass class LaunchPlanReference(Reference): @property def resource_type(self) -> int: return _identifier_model.ResourceType.LAUNCH_PLAN
[docs]@dataclass class WorkflowReference(Reference): @property def resource_type(self) -> int: return _identifier_model.ResourceType.WORKFLOW
class ReferenceEntity(object): def __init__( self, reference: Union[WorkflowReference, TaskReference, LaunchPlanReference], inputs: Optional[Dict[str, Union[Type[Any], Tuple[Type[Any], Any]]]], outputs: Dict[str, Type], ): if ( not isinstance(reference, WorkflowReference) and not isinstance(reference, TaskReference) and not isinstance(reference, LaunchPlanReference) ): raise Exception("Must be one of task, workflow, or launch plan") self._reference = reference self._native_interface = Interface(inputs=inputs, outputs=outputs) self._interface = transform_interface_to_typed_interface(self._native_interface) def execute(self, **kwargs) -> Any: raise Exception("Remote reference entities cannot be run locally. You must mock this out.") @property def python_interface(self) -> Interface: return self._native_interface @property def interface(self) -> _interface_models.TypedInterface: return self._interface @property def reference(self) -> Reference: return self._reference @property def name(self): return @property def id(self) -> _identifier_model.Identifier: return def unwrap_literal_map_and_execute( self, ctx: FlyteContext, input_literal_map: _literal_models.LiteralMap ) -> _literal_models.LiteralMap: """ Please see the implementation of the dispatch_execute function in the real task. """ # Invoked before the task is executed # Translate the input literals to Python native native_inputs = TypeEngine.literal_map_to_kwargs(ctx, input_literal_map, self.python_interface.inputs)"Invoking {} with inputs: {native_inputs}") try: native_outputs = self.execute(**native_inputs) except Exception as e: logger.exception(f"Exception when executing {e}") raise e"Task executed successfully in user level, outputs: {native_outputs}") expected_output_names = list(self.python_interface.outputs.keys()) if len(expected_output_names) == 1: native_outputs_as_map = {expected_output_names[0]: native_outputs} elif len(expected_output_names) == 0: native_outputs_as_map = {} else: native_outputs_as_map = {expected_output_names[i]: native_outputs[i] for i, _ in enumerate(native_outputs)} # We manually construct a LiteralMap here because task inputs and outputs actually violate the assumption # built into the IDL that all the values of a literal map are of the same type. literals = {} for k, v in native_outputs_as_map.items(): literal_type = self.interface.outputs[k].type py_type = self.python_interface.outputs[k] if isinstance(v, tuple): raise AssertionError(f"Output({k}) in task{} received a tuple {v}, instead of {py_type}") literals[k] = TypeEngine.to_literal(ctx, v, py_type, literal_type) outputs_literal_map = _literal_models.LiteralMap(literals=literals) # After the execute has been successfully completed return outputs_literal_map def local_execute(self, ctx: FlyteContext, **kwargs) -> Optional[Union[Tuple[Promise], Promise, VoidPromise]]: """ Please see the local_execute comments in the main task. """ # Unwrap the kwargs values. After this, we essentially have a LiteralMap # The reason why we need to do this is because the inputs during local execute can be of 2 types # - Promises or native constants # Promises as essentially inputs from previous task executions # native constants are just bound to this specific task (default values for a task input) # Also alongwith promises and constants, there could be dictionary or list of promises or constants kwargs = translate_inputs_to_literals( ctx, incoming_values=kwargs, flyte_interface_types=self.interface.inputs, native_types=self.python_interface.inputs, ) input_literal_map = _literal_models.LiteralMap(literals=kwargs) outputs_literal_map = self.unwrap_literal_map_and_execute(ctx, input_literal_map) # After running, we again have to wrap the outputs, if any, back into Promise objects outputs_literals = outputs_literal_map.literals output_names = list(self.python_interface.outputs.keys()) if len(output_names) != len(outputs_literals): # Length check, clean up exception raise AssertionError(f"Length difference {len(output_names)} {len(outputs_literals)}") # Tasks that don't return anything still return a VoidPromise if len(output_names) == 0: return VoidPromise( vals = [Promise(var, outputs_literals[var]) for var in output_names] return create_task_output(vals, self.python_interface) def construct_node_metadata(self) -> _workflow_model.NodeMetadata: return _workflow_model.NodeMetadata(name=extract_obj_name( def compile(self, ctx: FlyteContext, *args, **kwargs): return create_and_link_node(ctx, entity=self, **kwargs) def __call__(self, *args, **kwargs): # When a Task is () aka __called__, there are three things we may do: # a. Plain execution Mode - just run the execute function. If not overridden, we should raise an exception # b. Compilation Mode - this happens when the function is called as part of a workflow (potentially # dynamic task). Produce promise objects and create a node. # c. Workflow Execution Mode - when a workflow is being run locally. Even though workflows are functions # and everything should be able to be passed through naturally, we'll want to wrap output values of the # function into objects, so that potential .with_cpu or other ancillary functions can be attached to do # nothing. Subsequent tasks will have to know how to unwrap these. If by chance a non-Flyte task uses a # task output as an input, things probably will fail pretty obviously. # Since this is a reference entity, it still needs to be mocked otherwise an exception will be raised. if len(args) > 0: raise _user_exceptions.FlyteAssertion( f"Cannot call reference entity with args - detected {len(args)} positional args {args}" ) ctx = FlyteContext.current_context() if ctx.compilation_state is not None and ctx.compilation_state.mode == 1: return self.compile(ctx, *args, **kwargs) elif ( ctx.execution_state is not None and ctx.execution_state.mode == ExecutionState.Mode.LOCAL_WORKFLOW_EXECUTION ): if ctx.execution_state.branch_eval_mode == BranchEvalMode.BRANCH_SKIPPED: return return self.local_execute(ctx, **kwargs) else: logger.debug("Reference entity - running raw execute") return self.execute(**kwargs) # ReferenceEntity is not a registerable entity and therefore the below classes do not need to inherit from # flytekit.models.common.FlyteIdlEntity. class ReferenceTemplate(object): def __init__(self, id: _identifier_model.Identifier, resource_type: int) -> None: """ A reference template encapsulates all the information necessary to use reference entities within other workflows or dynamic tasks. :param flytekit.models.core.identifier.Identifier id: User-specified information that uniquely identifies this reference. :param int resource_type: The type of reference. See: flytekit.models.core.identifier.ResourceType """ self._id = id self._resource_type = resource_type @property def id(self) -> _identifier_model.Identifier: """ User-specified information that uniquely identifies this reference. :rtype: flytekit.models.core.identifier.Identifier """ return self._id @property def resource_type(self) -> int: """ The type of reference. :rtype: flytekit.models.core.identifier.ResourceType """ return self._resource_type class ReferenceSpec(object): def __init__(self, template: ReferenceTemplate) -> None: """ :param ReferenceTemplate template: """ self._template = template @property def template(self) -> ReferenceTemplate: """ :rtype: ReferenceTemplate """ return self._template