Source code for dagster._core.events

"""Structured representations of system events."""

import logging
import os
import sys
import uuid
from enum import Enum
from typing import (
    TYPE_CHECKING,
    AbstractSet,
    Any,
    Dict,
    Mapping,
    NamedTuple,
    Optional,
    Sequence,
    Tuple,
    Union,
    cast,
)

import dagster._check as check
from dagster._annotations import public
from dagster._core.definitions import (
    AssetKey,
    AssetMaterialization,
    AssetObservation,
    ExpectationResult,
    HookDefinition,
    NodeHandle,
)
from dagster._core.definitions.asset_check_evaluation import (
    AssetCheckEvaluation,
    AssetCheckEvaluationPlanned,
)
from dagster._core.definitions.events import AssetLineageInfo, ObjectStoreOperationType
from dagster._core.definitions.metadata import (
    MetadataFieldSerializer,
    MetadataValue,
    RawMetadataValue,
    normalize_metadata,
)
from dagster._core.definitions.partition import PartitionsSubset
from dagster._core.errors import DagsterInvariantViolationError, HookExecutionError
from dagster._core.execution.context.system import IPlanContext, IStepContext, StepExecutionContext
from dagster._core.execution.plan.handle import ResolvedFromDynamicStepHandle, StepHandle
from dagster._core.execution.plan.inputs import StepInputData
from dagster._core.execution.plan.objects import StepFailureData, StepRetryData, StepSuccessData
from dagster._core.execution.plan.outputs import StepOutputData
from dagster._core.log_manager import DagsterLogManager
from dagster._core.storage.compute_log_manager import CapturedLogContext
from dagster._core.storage.dagster_run import DagsterRunStatus
from dagster._serdes import NamedTupleSerializer, whitelist_for_serdes
from dagster._serdes.serdes import EnumSerializer, UnpackContext, is_whitelisted_for_serdes_object
from dagster._utils.error import SerializableErrorInfo, serializable_error_info_from_exc_info
from dagster._utils.timing import format_duration

if TYPE_CHECKING:
    from dagster._core.definitions.events import ObjectStoreOperation
    from dagster._core.execution.plan.plan import ExecutionPlan
    from dagster._core.execution.plan.step import StepKind


EventSpecificData = Union[
    StepOutputData,
    StepFailureData,
    StepSuccessData,
    "StepMaterializationData",
    "StepExpectationResultData",
    StepInputData,
    "EngineEventData",
    "HookErroredData",
    StepRetryData,
    "JobFailureData",
    "JobCanceledData",
    "ObjectStoreOperationResultData",
    "HandledOutputData",
    "LoadedInputData",
    "ComputeLogsCaptureData",
    "AssetObservationData",
    "AssetMaterializationPlannedData",
    "AssetCheckEvaluation",
    "AssetCheckEvaluationPlanned",
]



[docs]
class DagsterEventType(str, Enum):
    """The types of events that may be yielded by op and job execution."""

    STEP_OUTPUT = "STEP_OUTPUT"
    STEP_INPUT = "STEP_INPUT"
    STEP_FAILURE = "STEP_FAILURE"
    STEP_START = "STEP_START"
    STEP_SUCCESS = "STEP_SUCCESS"
    STEP_SKIPPED = "STEP_SKIPPED"

    # The process carrying out step execution is starting/started. Shown as a
    # marker start/end in the Dagster UI.
    STEP_WORKER_STARTING = "STEP_WORKER_STARTING"
    STEP_WORKER_STARTED = "STEP_WORKER_STARTED"

    # Resource initialization for execution has started/succeede/failed. Shown
    # as a marker start/end in the Dagster UI.
    RESOURCE_INIT_STARTED = "RESOURCE_INIT_STARTED"
    RESOURCE_INIT_SUCCESS = "RESOURCE_INIT_SUCCESS"
    RESOURCE_INIT_FAILURE = "RESOURCE_INIT_FAILURE"

    STEP_UP_FOR_RETRY = "STEP_UP_FOR_RETRY"  # "failed" but want to retry
    STEP_RESTARTED = "STEP_RESTARTED"

    ASSET_MATERIALIZATION = "ASSET_MATERIALIZATION"
    ASSET_MATERIALIZATION_PLANNED = "ASSET_MATERIALIZATION_PLANNED"
    ASSET_OBSERVATION = "ASSET_OBSERVATION"
    STEP_EXPECTATION_RESULT = "STEP_EXPECTATION_RESULT"
    ASSET_CHECK_EVALUATION_PLANNED = "ASSET_CHECK_EVALUATION_PLANNED"
    ASSET_CHECK_EVALUATION = "ASSET_CHECK_EVALUATION"

    # We want to display RUN_* events in the Dagster UI and in our LogManager output, but in order to
    # support backcompat for our storage layer, we need to keep the persisted value to be strings
    # of the form "PIPELINE_*".  We may have user code that pass in the DagsterEventType
    # enum values into storage APIs (like get_event_records, which takes in an EventRecordsFilter).
    RUN_ENQUEUED = "PIPELINE_ENQUEUED"
    RUN_DEQUEUED = "PIPELINE_DEQUEUED"
    RUN_STARTING = "PIPELINE_STARTING"  # Launch is happening, execution hasn't started yet
    RUN_START = "PIPELINE_START"  # Execution has started
    RUN_SUCCESS = "PIPELINE_SUCCESS"
    RUN_FAILURE = "PIPELINE_FAILURE"
    RUN_CANCELING = "PIPELINE_CANCELING"
    RUN_CANCELED = "PIPELINE_CANCELED"

    # Keep these legacy enum values around, to keep back-compatability for user code that might be
    # using these constants to filter event records
    PIPELINE_ENQUEUED = RUN_ENQUEUED
    PIPELINE_DEQUEUED = RUN_DEQUEUED
    PIPELINE_STARTING = RUN_STARTING
    PIPELINE_START = RUN_START
    PIPELINE_SUCCESS = RUN_SUCCESS
    PIPELINE_FAILURE = RUN_FAILURE
    PIPELINE_CANCELING = RUN_CANCELING
    PIPELINE_CANCELED = RUN_CANCELED

    OBJECT_STORE_OPERATION = "OBJECT_STORE_OPERATION"
    ASSET_STORE_OPERATION = "ASSET_STORE_OPERATION"
    LOADED_INPUT = "LOADED_INPUT"
    HANDLED_OUTPUT = "HANDLED_OUTPUT"

    ENGINE_EVENT = "ENGINE_EVENT"

    HOOK_COMPLETED = "HOOK_COMPLETED"
    HOOK_ERRORED = "HOOK_ERRORED"
    HOOK_SKIPPED = "HOOK_SKIPPED"

    ALERT_START = "ALERT_START"
    ALERT_SUCCESS = "ALERT_SUCCESS"
    ALERT_FAILURE = "ALERT_FAILURE"

    LOGS_CAPTURED = "LOGS_CAPTURED"



EVENT_TYPE_TO_DISPLAY_STRING = {
    DagsterEventType.PIPELINE_ENQUEUED: "RUN_ENQUEUED",
    DagsterEventType.PIPELINE_DEQUEUED: "RUN_DEQUEUED",
    DagsterEventType.PIPELINE_STARTING: "RUN_STARTING",
    DagsterEventType.PIPELINE_START: "RUN_START",
    DagsterEventType.PIPELINE_SUCCESS: "RUN_SUCCESS",
    DagsterEventType.PIPELINE_FAILURE: "RUN_FAILURE",
    DagsterEventType.PIPELINE_CANCELING: "RUN_CANCELING",
    DagsterEventType.PIPELINE_CANCELED: "RUN_CANCELED",
}

STEP_EVENTS = {
    DagsterEventType.STEP_INPUT,
    DagsterEventType.STEP_START,
    DagsterEventType.STEP_OUTPUT,
    DagsterEventType.STEP_FAILURE,
    DagsterEventType.STEP_SUCCESS,
    DagsterEventType.STEP_SKIPPED,
    DagsterEventType.ASSET_MATERIALIZATION,
    DagsterEventType.ASSET_OBSERVATION,
    DagsterEventType.STEP_EXPECTATION_RESULT,
    DagsterEventType.ASSET_CHECK_EVALUATION,
    DagsterEventType.OBJECT_STORE_OPERATION,
    DagsterEventType.HANDLED_OUTPUT,
    DagsterEventType.LOADED_INPUT,
    DagsterEventType.STEP_RESTARTED,
    DagsterEventType.STEP_UP_FOR_RETRY,
}

FAILURE_EVENTS = {
    DagsterEventType.RUN_FAILURE,
    DagsterEventType.STEP_FAILURE,
    DagsterEventType.RUN_CANCELED,
}

PIPELINE_EVENTS = {
    DagsterEventType.RUN_ENQUEUED,
    DagsterEventType.RUN_DEQUEUED,
    DagsterEventType.RUN_STARTING,
    DagsterEventType.RUN_START,
    DagsterEventType.RUN_SUCCESS,
    DagsterEventType.RUN_FAILURE,
    DagsterEventType.RUN_CANCELING,
    DagsterEventType.RUN_CANCELED,
}

HOOK_EVENTS = {
    DagsterEventType.HOOK_COMPLETED,
    DagsterEventType.HOOK_ERRORED,
    DagsterEventType.HOOK_SKIPPED,
}

ALERT_EVENTS = {
    DagsterEventType.ALERT_START,
    DagsterEventType.ALERT_SUCCESS,
    DagsterEventType.ALERT_FAILURE,
}

MARKER_EVENTS = {
    DagsterEventType.ENGINE_EVENT,
    DagsterEventType.STEP_WORKER_STARTING,
    DagsterEventType.STEP_WORKER_STARTED,
    DagsterEventType.RESOURCE_INIT_STARTED,
    DagsterEventType.RESOURCE_INIT_SUCCESS,
    DagsterEventType.RESOURCE_INIT_FAILURE,
}


EVENT_TYPE_TO_PIPELINE_RUN_STATUS = {
    DagsterEventType.RUN_START: DagsterRunStatus.STARTED,
    DagsterEventType.RUN_SUCCESS: DagsterRunStatus.SUCCESS,
    DagsterEventType.RUN_FAILURE: DagsterRunStatus.FAILURE,
    DagsterEventType.RUN_ENQUEUED: DagsterRunStatus.QUEUED,
    DagsterEventType.RUN_STARTING: DagsterRunStatus.STARTING,
    DagsterEventType.RUN_CANCELING: DagsterRunStatus.CANCELING,
    DagsterEventType.RUN_CANCELED: DagsterRunStatus.CANCELED,
}

PIPELINE_RUN_STATUS_TO_EVENT_TYPE = {v: k for k, v in EVENT_TYPE_TO_PIPELINE_RUN_STATUS.items()}

# These are the only events currently supported in `EventLogStorage.store_event_batch`
BATCH_WRITABLE_EVENTS = {
    DagsterEventType.ASSET_MATERIALIZATION,
    DagsterEventType.ASSET_OBSERVATION,
}

ASSET_EVENTS = {
    DagsterEventType.ASSET_MATERIALIZATION,
    DagsterEventType.ASSET_OBSERVATION,
    DagsterEventType.ASSET_MATERIALIZATION_PLANNED,
}

ASSET_CHECK_EVENTS = {
    DagsterEventType.ASSET_CHECK_EVALUATION,
    DagsterEventType.ASSET_CHECK_EVALUATION_PLANNED,
}


class RunFailureReasonSerializer(EnumSerializer):
    def unpack(self, value: str):
        try:
            RunFailureReason(value)
        except ValueError:
            return RunFailureReason.UNKNOWN

        return super().unpack(value)


@whitelist_for_serdes(serializer=RunFailureReasonSerializer)
class RunFailureReason(Enum):
    UNEXPECTED_TERMINATION = "UNEXPECTED_TERMINATION"
    RUN_EXCEPTION = "RUN_EXCEPTION"
    STEP_FAILURE = "STEP_FAILURE"
    JOB_INITIALIZATION_FAILURE = "JOB_INITIALIZATION_FAILURE"
    START_TIMEOUT = "START_TIMEOUT"
    RUN_WORKER_RESTART = "RUN_WORKER_RESTART"
    UNKNOWN = "UNKNOWN"


def _assert_type(
    method: str,
    expected_type: Union[DagsterEventType, Sequence[DagsterEventType]],
    actual_type: DagsterEventType,
) -> None:
    _expected_type = (
        [expected_type] if isinstance(expected_type, DagsterEventType) else expected_type
    )
    check.invariant(
        actual_type in _expected_type,
        f"{method} only callable when event_type is"
        f" {','.join([t.value for t in _expected_type])}, called on {actual_type}",
    )


def _validate_event_specific_data(
    event_type: DagsterEventType, event_specific_data: Optional["EventSpecificData"]
) -> Optional["EventSpecificData"]:
    if event_type == DagsterEventType.STEP_OUTPUT:
        check.inst_param(event_specific_data, "event_specific_data", StepOutputData)
    elif event_type == DagsterEventType.STEP_FAILURE:
        check.inst_param(event_specific_data, "event_specific_data", StepFailureData)
    elif event_type == DagsterEventType.STEP_SUCCESS:
        check.inst_param(event_specific_data, "event_specific_data", StepSuccessData)
    elif event_type == DagsterEventType.ASSET_MATERIALIZATION:
        check.inst_param(event_specific_data, "event_specific_data", StepMaterializationData)
    elif event_type == DagsterEventType.STEP_EXPECTATION_RESULT:
        check.inst_param(event_specific_data, "event_specific_data", StepExpectationResultData)
    elif event_type == DagsterEventType.STEP_INPUT:
        check.inst_param(event_specific_data, "event_specific_data", StepInputData)
    elif event_type in (
        DagsterEventType.ENGINE_EVENT,
        DagsterEventType.STEP_WORKER_STARTING,
        DagsterEventType.STEP_WORKER_STARTED,
        DagsterEventType.RESOURCE_INIT_STARTED,
        DagsterEventType.RESOURCE_INIT_SUCCESS,
        DagsterEventType.RESOURCE_INIT_FAILURE,
    ):
        check.inst_param(event_specific_data, "event_specific_data", EngineEventData)
    elif event_type == DagsterEventType.HOOK_ERRORED:
        check.inst_param(event_specific_data, "event_specific_data", HookErroredData)
    elif event_type == DagsterEventType.ASSET_MATERIALIZATION_PLANNED:
        check.inst_param(
            event_specific_data, "event_specific_data", AssetMaterializationPlannedData
        )
    elif event_type == DagsterEventType.ASSET_CHECK_EVALUATION_PLANNED:
        check.inst_param(event_specific_data, "event_specific_data", AssetCheckEvaluationPlanned)
    elif event_type == DagsterEventType.ASSET_CHECK_EVALUATION:
        check.inst_param(event_specific_data, "event_specific_data", AssetCheckEvaluation)

    return event_specific_data


def generate_event_batch_id():
    return str(uuid.uuid4())


def log_step_event(
    step_context: IStepContext,
    event: "DagsterEvent",
    batch_metadata: Optional["DagsterEventBatchMetadata"],
) -> None:
    event_type = DagsterEventType(event.event_type_value)
    log_level = logging.ERROR if event_type in FAILURE_EVENTS else logging.DEBUG

    step_context.log.log_dagster_event(
        level=log_level,
        msg=event.message or f"{event_type} for step {step_context.step.key}",
        dagster_event=event,
        batch_metadata=batch_metadata,
    )


def log_job_event(job_context: IPlanContext, event: "DagsterEvent") -> None:
    event_type = DagsterEventType(event.event_type_value)
    log_level = logging.ERROR if event_type in FAILURE_EVENTS else logging.DEBUG

    job_context.log.log_dagster_event(
        level=log_level,
        msg=event.message or f"{event_type} for pipeline {job_context.job_name}",
        dagster_event=event,
    )


def log_resource_event(log_manager: DagsterLogManager, event: "DagsterEvent") -> None:
    event_specific_data = cast(EngineEventData, event.event_specific_data)

    log_level = logging.ERROR if event_specific_data.error else logging.DEBUG
    log_manager.log_dagster_event(level=log_level, msg=event.message or "", dagster_event=event)


class DagsterEventSerializer(NamedTupleSerializer["DagsterEvent"]):
    def before_unpack(self, context, unpacked_dict: Any) -> Dict[str, Any]:
        event_type_value, event_specific_data = _handle_back_compat(
            unpacked_dict["event_type_value"], unpacked_dict.get("event_specific_data")
        )
        unpacked_dict["event_type_value"] = event_type_value
        unpacked_dict["event_specific_data"] = event_specific_data

        return unpacked_dict

    def handle_unpack_error(
        self,
        exc: Exception,
        context: UnpackContext,
        storage_dict: Dict[str, Any],
    ) -> "DagsterEvent":
        event_type_value, _ = _handle_back_compat(
            storage_dict["event_type_value"], storage_dict.get("event_specific_data")
        )
        step_key = storage_dict.get("step_key")
        orig_message = storage_dict.get("message")
        new_message = (
            f"Could not deserialize event of type {event_type_value}. This event may have been"
            " written by a newer version of Dagster."
            + (f' Original message: "{orig_message}"' if orig_message else "")
        )
        return DagsterEvent(
            event_type_value=DagsterEventType.ENGINE_EVENT.value,
            job_name=storage_dict["pipeline_name"],
            message=new_message,
            step_key=step_key,
            event_specific_data=EngineEventData(
                error=serializable_error_info_from_exc_info(sys.exc_info())
            ),
        )


class DagsterEventBatchMetadata(NamedTuple):
    id: str
    is_end: bool



[docs]
@whitelist_for_serdes(
    serializer=DagsterEventSerializer,
    storage_field_names={
        "node_handle": "solid_handle",
        "job_name": "pipeline_name",
    },
)
class DagsterEvent(
    NamedTuple(
        "_DagsterEvent",
        [
            ("event_type_value", str),
            ("job_name", str),
            ("step_handle", Optional[Union[StepHandle, ResolvedFromDynamicStepHandle]]),
            ("node_handle", Optional[NodeHandle]),
            ("step_kind_value", Optional[str]),
            ("logging_tags", Optional[Mapping[str, str]]),
            ("event_specific_data", Optional["EventSpecificData"]),
            ("message", Optional[str]),
            ("pid", Optional[int]),
            ("step_key", Optional[str]),
        ],
    )
):
    """Events yielded by op and job execution.

    Users should not instantiate this class.

    Attributes:
        event_type_value (str): Value for a DagsterEventType.
        job_name (str)
        node_handle (NodeHandle)
        step_kind_value (str): Value for a StepKind.
        logging_tags (Dict[str, str])
        event_specific_data (Any): Type must correspond to event_type_value.
        message (str)
        pid (int)
        step_key (Optional[str]): DEPRECATED
    """

    @staticmethod
    def from_step(
        event_type: "DagsterEventType",
        step_context: IStepContext,
        event_specific_data: Optional["EventSpecificData"] = None,
        message: Optional[str] = None,
        batch_metadata: Optional["DagsterEventBatchMetadata"] = None,
    ) -> "DagsterEvent":
        event = DagsterEvent(
            event_type_value=check.inst_param(event_type, "event_type", DagsterEventType).value,
            job_name=step_context.job_name,
            step_handle=step_context.step.handle,
            node_handle=step_context.step.node_handle,
            step_kind_value=step_context.step.kind.value,
            logging_tags=step_context.event_tags,
            event_specific_data=_validate_event_specific_data(event_type, event_specific_data),
            message=check.opt_str_param(message, "message"),
            pid=os.getpid(),
        )

        log_step_event(step_context, event, batch_metadata)

        return event

    @staticmethod
    def from_job(
        event_type: DagsterEventType,
        job_context: IPlanContext,
        message: Optional[str] = None,
        event_specific_data: Optional["EventSpecificData"] = None,
        step_handle: Optional[Union[StepHandle, ResolvedFromDynamicStepHandle]] = None,
    ) -> "DagsterEvent":
        check.opt_inst_param(
            step_handle, "step_handle", (StepHandle, ResolvedFromDynamicStepHandle)
        )

        event = DagsterEvent(
            event_type_value=check.inst_param(event_type, "event_type", DagsterEventType).value,
            job_name=job_context.job_name,
            message=check.opt_str_param(message, "message"),
            event_specific_data=_validate_event_specific_data(event_type, event_specific_data),
            step_handle=step_handle,
            pid=os.getpid(),
        )

        log_job_event(job_context, event)

        return event

    @staticmethod
    def from_resource(
        event_type: DagsterEventType,
        job_name: str,
        execution_plan: "ExecutionPlan",
        log_manager: DagsterLogManager,
        message: Optional[str] = None,
        event_specific_data: Optional["EngineEventData"] = None,
    ) -> "DagsterEvent":
        event = DagsterEvent(
            event_type_value=check.inst_param(event_type, "event_type", DagsterEventType).value,
            job_name=job_name,
            message=check.opt_str_param(message, "message"),
            event_specific_data=_validate_event_specific_data(
                DagsterEventType.ENGINE_EVENT, event_specific_data
            ),
            step_handle=execution_plan.step_handle_for_single_step_plans(),
            pid=os.getpid(),
        )
        log_resource_event(log_manager, event)
        return event

    def __new__(
        cls,
        event_type_value: str,
        job_name: str,
        step_handle: Optional[Union[StepHandle, ResolvedFromDynamicStepHandle]] = None,
        node_handle: Optional[NodeHandle] = None,
        step_kind_value: Optional[str] = None,
        logging_tags: Optional[Mapping[str, str]] = None,
        event_specific_data: Optional["EventSpecificData"] = None,
        message: Optional[str] = None,
        pid: Optional[int] = None,
        # legacy
        step_key: Optional[str] = None,
    ):
        # old events may contain node_handle but not step_handle
        if node_handle is not None and step_handle is None:
            step_handle = StepHandle(node_handle)

        # Legacy events may have step_key set directly, preserve those to stay in sync
        # with legacy execution plan snapshots.
        if step_handle is not None and step_key is None:
            step_key = step_handle.to_key()

        return super(DagsterEvent, cls).__new__(
            cls,
            check.str_param(event_type_value, "event_type_value"),
            check.str_param(job_name, "job_name"),
            check.opt_inst_param(
                step_handle, "step_handle", (StepHandle, ResolvedFromDynamicStepHandle)
            ),
            check.opt_inst_param(node_handle, "node_handle", NodeHandle),
            check.opt_str_param(step_kind_value, "step_kind_value"),
            check.opt_mapping_param(logging_tags, "logging_tags"),
            _validate_event_specific_data(DagsterEventType(event_type_value), event_specific_data),
            check.opt_str_param(message, "message"),
            check.opt_int_param(pid, "pid"),
            check.opt_str_param(step_key, "step_key"),
        )

    @property
    def node_name(self) -> str:
        check.invariant(self.node_handle is not None)
        node_handle = cast(NodeHandle, self.node_handle)
        return node_handle.name

    @public
    @property
    def event_type(self) -> DagsterEventType:
        """DagsterEventType: The type of this event."""
        return DagsterEventType(self.event_type_value)

    @public
    @property
    def is_step_event(self) -> bool:
        """bool: If this event relates to a specific step."""
        return self.event_type in STEP_EVENTS

    @public
    @property
    def is_hook_event(self) -> bool:
        """bool: If this event relates to the execution of a hook."""
        return self.event_type in HOOK_EVENTS

    @property
    def is_alert_event(self) -> bool:
        return self.event_type in ALERT_EVENTS

    @property
    def step_kind(self) -> "StepKind":
        from dagster._core.execution.plan.step import StepKind

        return StepKind(self.step_kind_value)

    @public
    @property
    def is_step_success(self) -> bool:
        """bool: If this event is of type STEP_SUCCESS."""
        return self.event_type == DagsterEventType.STEP_SUCCESS

    @public
    @property
    def is_successful_output(self) -> bool:
        """bool: If this event is of type STEP_OUTPUT."""
        return self.event_type == DagsterEventType.STEP_OUTPUT

    @public
    @property
    def is_step_start(self) -> bool:
        """bool: If this event is of type STEP_START."""
        return self.event_type == DagsterEventType.STEP_START

    @public
    @property
    def is_step_failure(self) -> bool:
        """bool: If this event is of type STEP_FAILURE."""
        return self.event_type == DagsterEventType.STEP_FAILURE

    @public
    @property
    def is_resource_init_failure(self) -> bool:
        """bool: If this event is of type RESOURCE_INIT_FAILURE."""
        return self.event_type == DagsterEventType.RESOURCE_INIT_FAILURE

    @public
    @property
    def is_step_skipped(self) -> bool:
        """bool: If this event is of type STEP_SKIPPED."""
        return self.event_type == DagsterEventType.STEP_SKIPPED

    @public
    @property
    def is_step_up_for_retry(self) -> bool:
        """bool: If this event is of type STEP_UP_FOR_RETRY."""
        return self.event_type == DagsterEventType.STEP_UP_FOR_RETRY

    @public
    @property
    def is_step_restarted(self) -> bool:
        """bool: If this event is of type STEP_RESTARTED."""
        return self.event_type == DagsterEventType.STEP_RESTARTED

    @property
    def is_job_success(self) -> bool:
        return self.event_type == DagsterEventType.RUN_SUCCESS

    @property
    def is_job_failure(self) -> bool:
        return self.event_type == DagsterEventType.RUN_FAILURE

    @property
    def is_run_failure(self) -> bool:
        return self.event_type == DagsterEventType.RUN_FAILURE

    @public
    @property
    def is_failure(self) -> bool:
        """bool: If this event represents the failure of a run or step."""
        return self.event_type in FAILURE_EVENTS

    @property
    def is_job_event(self) -> bool:
        return self.event_type in PIPELINE_EVENTS

    @public
    @property
    def is_engine_event(self) -> bool:
        """bool: If this event is of type ENGINE_EVENT."""
        return self.event_type == DagsterEventType.ENGINE_EVENT

    @public
    @property
    def is_handled_output(self) -> bool:
        """bool: If this event is of type HANDLED_OUTPUT."""
        return self.event_type == DagsterEventType.HANDLED_OUTPUT

    @public
    @property
    def is_loaded_input(self) -> bool:
        """bool: If this event is of type LOADED_INPUT."""
        return self.event_type == DagsterEventType.LOADED_INPUT

    @public
    @property
    def is_step_materialization(self) -> bool:
        """bool: If this event is of type ASSET_MATERIALIZATION."""
        return self.event_type == DagsterEventType.ASSET_MATERIALIZATION

    @public
    @property
    def is_expectation_result(self) -> bool:
        """bool: If this event is of type STEP_EXPECTATION_RESULT."""
        return self.event_type == DagsterEventType.STEP_EXPECTATION_RESULT

    @public
    @property
    def is_asset_observation(self) -> bool:
        """bool: If this event is of type ASSET_OBSERVATION."""
        return self.event_type == DagsterEventType.ASSET_OBSERVATION

    @public
    @property
    def is_asset_materialization_planned(self) -> bool:
        """bool: If this event is of type ASSET_MATERIALIZATION_PLANNED."""
        return self.event_type == DagsterEventType.ASSET_MATERIALIZATION_PLANNED

    @public
    @property
    def asset_key(self) -> Optional[AssetKey]:
        """Optional[AssetKey]: For events that correspond to a specific asset_key / partition
        (ASSET_MATERIALIZTION, ASSET_OBSERVATION, ASSET_MATERIALIZATION_PLANNED), returns that
        asset key. Otherwise, returns None.
        """
        if self.event_type == DagsterEventType.ASSET_MATERIALIZATION:
            return self.step_materialization_data.materialization.asset_key
        elif self.event_type == DagsterEventType.ASSET_OBSERVATION:
            return self.asset_observation_data.asset_observation.asset_key
        elif self.event_type == DagsterEventType.ASSET_MATERIALIZATION_PLANNED:
            return self.asset_materialization_planned_data.asset_key
        else:
            return None

    @public
    @property
    def partition(self) -> Optional[str]:
        """Optional[AssetKey]: For events that correspond to a specific asset_key / partition
        (ASSET_MATERIALIZTION, ASSET_OBSERVATION, ASSET_MATERIALIZATION_PLANNED), returns that
        partition. Otherwise, returns None.
        """
        if self.event_type == DagsterEventType.ASSET_MATERIALIZATION:
            return self.step_materialization_data.materialization.partition
        elif self.event_type == DagsterEventType.ASSET_OBSERVATION:
            return self.asset_observation_data.asset_observation.partition
        elif self.event_type == DagsterEventType.ASSET_MATERIALIZATION_PLANNED:
            return self.asset_materialization_planned_data.partition
        else:
            return None

    @property
    def partitions_subset(self) -> Optional[PartitionsSubset]:
        if self.event_type == DagsterEventType.ASSET_MATERIALIZATION_PLANNED:
            return self.asset_materialization_planned_data.partitions_subset
        return None

    @property
    def step_input_data(self) -> "StepInputData":
        _assert_type("step_input_data", DagsterEventType.STEP_INPUT, self.event_type)
        return cast(StepInputData, self.event_specific_data)

    @property
    def step_output_data(self) -> StepOutputData:
        _assert_type("step_output_data", DagsterEventType.STEP_OUTPUT, self.event_type)
        return cast(StepOutputData, self.event_specific_data)

    @property
    def step_success_data(self) -> "StepSuccessData":
        _assert_type("step_success_data", DagsterEventType.STEP_SUCCESS, self.event_type)
        return cast(StepSuccessData, self.event_specific_data)

    @property
    def step_failure_data(self) -> "StepFailureData":
        _assert_type("step_failure_data", DagsterEventType.STEP_FAILURE, self.event_type)
        return cast(StepFailureData, self.event_specific_data)

    @property
    def step_retry_data(self) -> "StepRetryData":
        _assert_type("step_retry_data", DagsterEventType.STEP_UP_FOR_RETRY, self.event_type)
        return cast(StepRetryData, self.event_specific_data)

    @property
    def step_materialization_data(self) -> "StepMaterializationData":
        _assert_type(
            "step_materialization_data", DagsterEventType.ASSET_MATERIALIZATION, self.event_type
        )
        return cast(StepMaterializationData, self.event_specific_data)

    @property
    def asset_observation_data(self) -> "AssetObservationData":
        _assert_type("asset_observation_data", DagsterEventType.ASSET_OBSERVATION, self.event_type)
        return cast(AssetObservationData, self.event_specific_data)

    @property
    def asset_materialization_planned_data(self) -> "AssetMaterializationPlannedData":
        _assert_type(
            "asset_materialization_planned",
            DagsterEventType.ASSET_MATERIALIZATION_PLANNED,
            self.event_type,
        )
        return cast(AssetMaterializationPlannedData, self.event_specific_data)

    @property
    def asset_check_planned_data(self) -> "AssetCheckEvaluationPlanned":
        _assert_type(
            "asset_check_planned",
            DagsterEventType.ASSET_CHECK_EVALUATION_PLANNED,
            self.event_type,
        )
        return cast(AssetCheckEvaluationPlanned, self.event_specific_data)

    @property
    def step_expectation_result_data(self) -> "StepExpectationResultData":
        _assert_type(
            "step_expectation_result_data",
            DagsterEventType.STEP_EXPECTATION_RESULT,
            self.event_type,
        )
        return cast(StepExpectationResultData, self.event_specific_data)

    @property
    def materialization(self) -> AssetMaterialization:
        _assert_type(
            "step_materialization_data", DagsterEventType.ASSET_MATERIALIZATION, self.event_type
        )
        return cast(StepMaterializationData, self.event_specific_data).materialization

    @property
    def asset_check_evaluation_data(self) -> AssetCheckEvaluation:
        _assert_type(
            "asset_check_evaluation", DagsterEventType.ASSET_CHECK_EVALUATION, self.event_type
        )
        return cast(AssetCheckEvaluation, self.event_specific_data)

    @property
    def job_failure_data(self) -> "JobFailureData":
        _assert_type("job_failure_data", DagsterEventType.RUN_FAILURE, self.event_type)
        return cast(JobFailureData, self.event_specific_data)

    @property
    def job_canceled_data(self) -> "JobCanceledData":
        _assert_type("job_canceled_data", DagsterEventType.RUN_CANCELED, self.event_type)
        return cast(JobCanceledData, self.event_specific_data)

    @property
    def engine_event_data(self) -> "EngineEventData":
        _assert_type(
            "engine_event_data",
            [
                DagsterEventType.ENGINE_EVENT,
                DagsterEventType.RESOURCE_INIT_STARTED,
                DagsterEventType.RESOURCE_INIT_SUCCESS,
                DagsterEventType.RESOURCE_INIT_FAILURE,
                DagsterEventType.STEP_WORKER_STARTED,
                DagsterEventType.STEP_WORKER_STARTING,
            ],
            self.event_type,
        )
        return cast(EngineEventData, self.event_specific_data)

    @property
    def hook_completed_data(self) -> Optional["EventSpecificData"]:
        _assert_type("hook_completed_data", DagsterEventType.HOOK_COMPLETED, self.event_type)
        return self.event_specific_data

    @property
    def hook_errored_data(self) -> "HookErroredData":
        _assert_type("hook_errored_data", DagsterEventType.HOOK_ERRORED, self.event_type)
        return cast(HookErroredData, self.event_specific_data)

    @property
    def hook_skipped_data(self) -> Optional["EventSpecificData"]:
        _assert_type("hook_skipped_data", DagsterEventType.HOOK_SKIPPED, self.event_type)
        return self.event_specific_data

    @property
    def logs_captured_data(self) -> "ComputeLogsCaptureData":
        _assert_type("logs_captured_data", DagsterEventType.LOGS_CAPTURED, self.event_type)
        return cast(ComputeLogsCaptureData, self.event_specific_data)

    @staticmethod
    def step_output_event(
        step_context: StepExecutionContext, step_output_data: StepOutputData
    ) -> "DagsterEvent":
        output_def = step_context.op.output_def_named(
            step_output_data.step_output_handle.output_name
        )

        return DagsterEvent.from_step(
            event_type=DagsterEventType.STEP_OUTPUT,
            step_context=step_context,
            event_specific_data=step_output_data,
            message=(
                'Yielded output "{output_name}"{mapping_clause} of type'
                ' "{output_type}".{type_check_clause}'.format(
                    output_name=step_output_data.step_output_handle.output_name,
                    output_type=output_def.dagster_type.display_name,
                    type_check_clause=(
                        (
                            " Warning! Type check failed."
                            if not step_output_data.type_check_data.success
                            else " (Type check passed)."
                        )
                        if step_output_data.type_check_data
                        else " (No type check)."
                    ),
                    mapping_clause=(
                        f' mapping key "{step_output_data.step_output_handle.mapping_key}"'
                        if step_output_data.step_output_handle.mapping_key
                        else ""
                    ),
                )
            ),
        )

    @staticmethod
    def step_failure_event(
        step_context: IStepContext,
        step_failure_data: "StepFailureData",
        message=None,
    ) -> "DagsterEvent":
        return DagsterEvent.from_step(
            event_type=DagsterEventType.STEP_FAILURE,
            step_context=step_context,
            event_specific_data=step_failure_data,
            message=(message or f'Execution of step "{step_context.step.key}" failed.'),
        )

    @staticmethod
    def step_retry_event(
        step_context: IStepContext, step_retry_data: "StepRetryData"
    ) -> "DagsterEvent":
        return DagsterEvent.from_step(
            event_type=DagsterEventType.STEP_UP_FOR_RETRY,
            step_context=step_context,
            event_specific_data=step_retry_data,
            message=(
                'Execution of step "{step_key}" failed and has requested a retry{wait_str}.'.format(
                    step_key=step_context.step.key,
                    wait_str=(
                        f" in {step_retry_data.seconds_to_wait} seconds"
                        if step_retry_data.seconds_to_wait
                        else ""
                    ),
                )
            ),
        )

    @staticmethod
    def step_input_event(
        step_context: StepExecutionContext, step_input_data: "StepInputData"
    ) -> "DagsterEvent":
        input_def = step_context.op_def.input_def_named(step_input_data.input_name)

        return DagsterEvent.from_step(
            event_type=DagsterEventType.STEP_INPUT,
            step_context=step_context,
            event_specific_data=step_input_data,
            message='Got input "{input_name}" of type "{input_type}".{type_check_clause}'.format(
                input_name=step_input_data.input_name,
                input_type=input_def.dagster_type.display_name,
                type_check_clause=(
                    (
                        " Warning! Type check failed."
                        if not step_input_data.type_check_data.success
                        else " (Type check passed)."
                    )
                    if step_input_data.type_check_data
                    else " (No type check)."
                ),
            ),
        )

    @staticmethod
    def step_start_event(step_context: IStepContext) -> "DagsterEvent":
        return DagsterEvent.from_step(
            event_type=DagsterEventType.STEP_START,
            step_context=step_context,
            message=f'Started execution of step "{step_context.step.key}".',
        )

    @staticmethod
    def step_restarted_event(step_context: IStepContext, previous_attempts: int) -> "DagsterEvent":
        return DagsterEvent.from_step(
            event_type=DagsterEventType.STEP_RESTARTED,
            step_context=step_context,
            message=f'Started re-execution (attempt # {previous_attempts + 1}) of step "{step_context.step.key}".',
        )

    @staticmethod
    def step_success_event(
        step_context: IStepContext, success: "StepSuccessData"
    ) -> "DagsterEvent":
        return DagsterEvent.from_step(
            event_type=DagsterEventType.STEP_SUCCESS,
            step_context=step_context,
            event_specific_data=success,
            message=f'Finished execution of step "{step_context.step.key}" in {format_duration(success.duration_ms)}.',
        )

    @staticmethod
    def step_skipped_event(step_context: IStepContext) -> "DagsterEvent":
        return DagsterEvent.from_step(
            event_type=DagsterEventType.STEP_SKIPPED,
            step_context=step_context,
            message=f'Skipped execution of step "{step_context.step.key}".',
        )

    @staticmethod
    def asset_materialization(
        step_context: IStepContext,
        materialization: AssetMaterialization,
        batch_metadata: Optional[DagsterEventBatchMetadata] = None,
    ) -> "DagsterEvent":
        return DagsterEvent.from_step(
            event_type=DagsterEventType.ASSET_MATERIALIZATION,
            step_context=step_context,
            event_specific_data=StepMaterializationData(materialization),
            message=(
                materialization.description
                if materialization.description
                else "Materialized value{label_clause}.".format(
                    label_clause=f" {materialization.label}" if materialization.label else ""
                )
            ),
            batch_metadata=batch_metadata,
        )

    @staticmethod
    def asset_observation(
        step_context: IStepContext,
        observation: AssetObservation,
        batch_metadata: Optional[DagsterEventBatchMetadata] = None,
    ) -> "DagsterEvent":
        return DagsterEvent.from_step(
            event_type=DagsterEventType.ASSET_OBSERVATION,
            step_context=step_context,
            event_specific_data=AssetObservationData(observation),
            batch_metadata=batch_metadata,
        )

    @staticmethod
    def asset_check_evaluation(
        step_context: IStepContext, asset_check_evaluation: AssetCheckEvaluation
    ) -> "DagsterEvent":
        return DagsterEvent.from_step(
            event_type=DagsterEventType.ASSET_CHECK_EVALUATION,
            step_context=step_context,
            event_specific_data=asset_check_evaluation,
        )

    @staticmethod
    def step_expectation_result(
        step_context: IStepContext, expectation_result: ExpectationResult
    ) -> "DagsterEvent":
        def _msg():
            if expectation_result.description:
                return expectation_result.description

            return "Expectation{label_clause} {result_verb}".format(
                label_clause=" " + expectation_result.label if expectation_result.label else "",
                result_verb="passed" if expectation_result.success else "failed",
            )

        return DagsterEvent.from_step(
            event_type=DagsterEventType.STEP_EXPECTATION_RESULT,
            step_context=step_context,
            event_specific_data=StepExpectationResultData(expectation_result),
            message=_msg(),
        )

    @staticmethod
    def step_concurrency_blocked(
        step_context: IStepContext, concurrency_key: str, initial=True
    ) -> "DagsterEvent":
        message = (
            f"Step blocked by concurrency limit for key {concurrency_key}"
            if initial
            else f"Step still blocked by concurrency limit for key {concurrency_key}"
        )
        return DagsterEvent.from_step(
            event_type=DagsterEventType.ENGINE_EVENT,
            step_context=step_context,
            message=message,
            event_specific_data=EngineEventData(metadata={"concurrency_key": concurrency_key}),
        )

    @staticmethod
    def job_start(job_context: IPlanContext) -> "DagsterEvent":
        return DagsterEvent.from_job(
            DagsterEventType.RUN_START,
            job_context,
            message=f'Started execution of run for "{job_context.job_name}".',
        )

    @staticmethod
    def job_success(job_context: IPlanContext) -> "DagsterEvent":
        return DagsterEvent.from_job(
            DagsterEventType.RUN_SUCCESS,
            job_context,
            message=f'Finished execution of run for "{job_context.job_name}".',
        )

    @staticmethod
    def job_failure(
        job_context_or_name: Union[IPlanContext, str],
        context_msg: str,
        failure_reason: RunFailureReason,
        error_info: Optional[SerializableErrorInfo] = None,
        first_step_failure_event: Optional["DagsterEvent"] = None,
    ) -> "DagsterEvent":
        check.str_param(context_msg, "context_msg")
        if isinstance(job_context_or_name, IPlanContext):
            return DagsterEvent.from_job(
                DagsterEventType.RUN_FAILURE,
                job_context_or_name,
                message=(
                    f'Execution of run for "{job_context_or_name.job_name}" failed. {context_msg}'
                ),
                event_specific_data=JobFailureData(
                    error_info,
                    failure_reason=failure_reason,
                    first_step_failure_event=first_step_failure_event,
                ),
            )
        else:
            # when the failure happens trying to bring up context, the job_context hasn't been
            # built and so can't use from_pipeline
            check.str_param(job_context_or_name, "pipeline_name")
            event = DagsterEvent(
                event_type_value=DagsterEventType.RUN_FAILURE.value,
                job_name=job_context_or_name,
                event_specific_data=JobFailureData(error_info, failure_reason=failure_reason),
                message=f'Execution of run for "{job_context_or_name}" failed. {context_msg}',
                pid=os.getpid(),
            )
            return event

    @staticmethod
    def job_canceled(
        job_context: IPlanContext,
        error_info: Optional[SerializableErrorInfo] = None,
        message: Optional[str] = None,
    ) -> "DagsterEvent":
        return DagsterEvent.from_job(
            DagsterEventType.RUN_CANCELED,
            job_context,
            message=message or f'Execution of run for "{job_context.job_name}" canceled.',
            event_specific_data=JobCanceledData(
                check.opt_inst_param(error_info, "error_info", SerializableErrorInfo)
            ),
        )

    @staticmethod
    def step_worker_starting(
        step_context: IStepContext,
        message: str,
        metadata: Mapping[str, RawMetadataValue],
    ) -> "DagsterEvent":
        return DagsterEvent.from_step(
            DagsterEventType.STEP_WORKER_STARTING,
            step_context,
            message=message,
            event_specific_data=EngineEventData(
                metadata=metadata, marker_start="step_process_start"
            ),
        )

    @staticmethod
    def step_worker_started(
        log_manager: DagsterLogManager,
        job_name: str,
        message: str,
        metadata: Mapping[str, RawMetadataValue],
        step_key: Optional[str],
    ) -> "DagsterEvent":
        event = DagsterEvent(
            DagsterEventType.STEP_WORKER_STARTED.value,
            job_name=job_name,
            message=message,
            event_specific_data=EngineEventData(metadata=metadata, marker_end="step_process_start"),
            pid=os.getpid(),
            step_key=step_key,
        )
        log_manager.log_dagster_event(
            level=logging.DEBUG,
            msg=message,
            dagster_event=event,
        )
        return event

    @staticmethod
    def resource_init_start(
        job_name: str,
        execution_plan: "ExecutionPlan",
        log_manager: DagsterLogManager,
        resource_keys: AbstractSet[str],
    ) -> "DagsterEvent":
        return DagsterEvent.from_resource(
            DagsterEventType.RESOURCE_INIT_STARTED,
            job_name=job_name,
            execution_plan=execution_plan,
            log_manager=log_manager,
            message="Starting initialization of resources [{}].".format(
                ", ".join(sorted(resource_keys))
            ),
            event_specific_data=EngineEventData(metadata={}, marker_start="resources"),
        )

    @staticmethod
    def resource_init_success(
        job_name: str,
        execution_plan: "ExecutionPlan",
        log_manager: DagsterLogManager,
        resource_instances: Mapping[str, Any],
        resource_init_times: Mapping[str, str],
    ) -> "DagsterEvent":
        metadata = {}
        for key in resource_instances.keys():
            metadata[key] = MetadataValue.python_artifact(resource_instances[key].__class__)
            metadata[f"{key}:init_time"] = resource_init_times[key]

        return DagsterEvent.from_resource(
            DagsterEventType.RESOURCE_INIT_SUCCESS,
            job_name=job_name,
            execution_plan=execution_plan,
            log_manager=log_manager,
            message="Finished initialization of resources [{}].".format(
                ", ".join(sorted(resource_init_times.keys()))
            ),
            event_specific_data=EngineEventData(
                metadata=metadata,
                marker_end="resources",
            ),
        )

    @staticmethod
    def resource_init_failure(
        job_name: str,
        execution_plan: "ExecutionPlan",
        log_manager: DagsterLogManager,
        resource_keys: AbstractSet[str],
        error: SerializableErrorInfo,
    ) -> "DagsterEvent":
        return DagsterEvent.from_resource(
            DagsterEventType.RESOURCE_INIT_FAILURE,
            job_name=job_name,
            execution_plan=execution_plan,
            log_manager=log_manager,
            message="Initialization of resources [{}] failed.".format(", ".join(resource_keys)),
            event_specific_data=EngineEventData(
                metadata={},
                marker_end="resources",
                error=error,
            ),
        )

    @staticmethod
    def resource_teardown_failure(
        job_name: str,
        execution_plan: "ExecutionPlan",
        log_manager: DagsterLogManager,
        resource_keys: AbstractSet[str],
        error: SerializableErrorInfo,
    ) -> "DagsterEvent":
        return DagsterEvent.from_resource(
            DagsterEventType.ENGINE_EVENT,
            job_name=job_name,
            execution_plan=execution_plan,
            log_manager=log_manager,
            message="Teardown of resources [{}] failed.".format(", ".join(resource_keys)),
            event_specific_data=EngineEventData(
                metadata={},
                marker_start=None,
                marker_end=None,
                error=error,
            ),
        )

    @staticmethod
    def engine_event(
        plan_context: IPlanContext,
        message: str,
        event_specific_data: Optional["EngineEventData"] = None,
    ) -> "DagsterEvent":
        if isinstance(plan_context, IStepContext):
            return DagsterEvent.from_step(
                DagsterEventType.ENGINE_EVENT,
                step_context=plan_context,
                event_specific_data=event_specific_data,
                message=message,
            )
        else:
            return DagsterEvent.from_job(
                DagsterEventType.ENGINE_EVENT,
                plan_context,
                message,
                event_specific_data=event_specific_data,
            )

    @staticmethod
    def object_store_operation(
        step_context: IStepContext, object_store_operation_result: "ObjectStoreOperation"
    ) -> "DagsterEvent":
        object_store_name = (
            f"{object_store_operation_result.object_store_name} "
            if object_store_operation_result.object_store_name
            else ""
        )

        serialization_strategy_modifier = (
            f" using {object_store_operation_result.serialization_strategy_name}"
            if object_store_operation_result.serialization_strategy_name
            else ""
        )

        value_name = object_store_operation_result.value_name

        if (
            ObjectStoreOperationType(object_store_operation_result.op)
            == ObjectStoreOperationType.SET_OBJECT
        ):
            message = (
                f"Stored intermediate object for output {value_name} in "
                f"{object_store_name}object store{serialization_strategy_modifier}."
            )
        elif (
            ObjectStoreOperationType(object_store_operation_result.op)
            == ObjectStoreOperationType.GET_OBJECT
        ):
            message = (
                f"Retrieved intermediate object for input {value_name} in "
                f"{object_store_name}object store{serialization_strategy_modifier}."
            )
        elif (
            ObjectStoreOperationType(object_store_operation_result.op)
            == ObjectStoreOperationType.CP_OBJECT
        ):
            message = f"Copied intermediate object for input {value_name} from {object_store_operation_result.key} to {object_store_operation_result.dest_key}"
        else:
            message = ""

        return DagsterEvent.from_step(
            DagsterEventType.OBJECT_STORE_OPERATION,
            step_context,
            event_specific_data=ObjectStoreOperationResultData(
                op=object_store_operation_result.op,
                value_name=value_name,
                address=object_store_operation_result.key,
                metadata={"key": MetadataValue.path(object_store_operation_result.key)},
                version=object_store_operation_result.version,
                mapping_key=object_store_operation_result.mapping_key,
            ),
            message=message,
        )

    @staticmethod
    def handled_output(
        step_context: IStepContext,
        output_name: str,
        manager_key: str,
        message_override: Optional[str] = None,
        metadata: Optional[Mapping[str, MetadataValue]] = None,
    ) -> "DagsterEvent":
        message = f'Handled output "{output_name}" using IO manager "{manager_key}"'
        return DagsterEvent.from_step(
            event_type=DagsterEventType.HANDLED_OUTPUT,
            step_context=step_context,
            event_specific_data=HandledOutputData(
                output_name=output_name,
                manager_key=manager_key,
                metadata=metadata if metadata else {},
            ),
            message=message_override or message,
        )

    @staticmethod
    def loaded_input(
        step_context: IStepContext,
        input_name: str,
        manager_key: str,
        upstream_output_name: Optional[str] = None,
        upstream_step_key: Optional[str] = None,
        message_override: Optional[str] = None,
        metadata: Optional[Mapping[str, MetadataValue]] = None,
    ) -> "DagsterEvent":
        message = f'Loaded input "{input_name}" using input manager "{manager_key}"'
        if upstream_output_name:
            message += f', from output "{upstream_output_name}" of step "{upstream_step_key}"'

        return DagsterEvent.from_step(
            event_type=DagsterEventType.LOADED_INPUT,
            step_context=step_context,
            event_specific_data=LoadedInputData(
                input_name=input_name,
                manager_key=manager_key,
                upstream_output_name=upstream_output_name,
                upstream_step_key=upstream_step_key,
                metadata=metadata if metadata else {},
            ),
            message=message_override or message,
        )

    @staticmethod
    def hook_completed(
        step_context: StepExecutionContext, hook_def: HookDefinition
    ) -> "DagsterEvent":
        event_type = DagsterEventType.HOOK_COMPLETED

        event = DagsterEvent(
            event_type_value=event_type.value,
            job_name=step_context.job_name,
            step_handle=step_context.step.handle,
            node_handle=step_context.step.node_handle,
            step_kind_value=step_context.step.kind.value,
            logging_tags=step_context.event_tags,
            message=(
                f'Finished the execution of hook "{hook_def.name}" triggered for'
                f' "{step_context.op.name}".'
            ),
        )

        step_context.log.log_dagster_event(
            level=logging.DEBUG, msg=event.message or "", dagster_event=event
        )

        return event

    @staticmethod
    def hook_errored(
        step_context: StepExecutionContext, error: HookExecutionError
    ) -> "DagsterEvent":
        event_type = DagsterEventType.HOOK_ERRORED

        event = DagsterEvent(
            event_type_value=event_type.value,
            job_name=step_context.job_name,
            step_handle=step_context.step.handle,
            node_handle=step_context.step.node_handle,
            step_kind_value=step_context.step.kind.value,
            logging_tags=step_context.event_tags,
            event_specific_data=_validate_event_specific_data(
                event_type,
                HookErroredData(
                    error=serializable_error_info_from_exc_info(error.original_exc_info)
                ),
            ),
        )

        step_context.log.log_dagster_event(level=logging.ERROR, msg=str(error), dagster_event=event)

        return event

    @staticmethod
    def hook_skipped(
        step_context: StepExecutionContext, hook_def: HookDefinition
    ) -> "DagsterEvent":
        event_type = DagsterEventType.HOOK_SKIPPED

        event = DagsterEvent(
            event_type_value=event_type.value,
            job_name=step_context.job_name,
            step_handle=step_context.step.handle,
            node_handle=step_context.step.node_handle,
            step_kind_value=step_context.step.kind.value,
            logging_tags=step_context.event_tags,
            message=(
                f'Skipped the execution of hook "{hook_def.name}". It did not meet its triggering '
                f'condition during the execution of "{step_context.op.name}".'
            ),
        )

        step_context.log.log_dagster_event(
            level=logging.DEBUG, msg=event.message or "", dagster_event=event
        )

        return event

    @staticmethod
    def legacy_compute_log_step_event(step_context: StepExecutionContext):
        step_key = step_context.step.key
        return DagsterEvent.from_step(
            DagsterEventType.LOGS_CAPTURED,
            step_context,
            message=f"Started capturing logs for step: {step_key}.",
            event_specific_data=ComputeLogsCaptureData(
                step_keys=[step_key],
                file_key=step_key,
            ),
        )

    @staticmethod
    def capture_logs(
        job_context: IPlanContext,
        step_keys: Sequence[str],
        log_key: Sequence[str],
        log_context: CapturedLogContext,
    ):
        file_key = log_key[-1]
        return DagsterEvent.from_job(
            DagsterEventType.LOGS_CAPTURED,
            job_context,
            message=f"Started capturing logs in process (pid: {os.getpid()}).",
            event_specific_data=ComputeLogsCaptureData(
                step_keys=step_keys,
                file_key=file_key,
                external_stdout_url=log_context.external_stdout_url,
                external_stderr_url=log_context.external_stderr_url,
                external_url=log_context.external_url,
            ),
        )

    @staticmethod
    def build_asset_materialization_planned_event(
        job_name: str,
        step_key: str,
        asset_materialization_planned_data: "AssetMaterializationPlannedData",
    ) -> "DagsterEvent":
        """Constructs an asset materialization planned event, to be logged by the caller."""
        event = DagsterEvent(
            event_type_value=DagsterEventType.ASSET_MATERIALIZATION_PLANNED.value,
            job_name=job_name,
            message=(
                f"{job_name} intends to materialize asset {asset_materialization_planned_data.asset_key.to_string()}"
            ),
            event_specific_data=asset_materialization_planned_data,
            step_key=step_key,
        )
        return event



def get_step_output_event(
    events: Sequence[DagsterEvent], step_key: str, output_name: Optional[str] = "result"
) -> Optional["DagsterEvent"]:
    check.sequence_param(events, "events", of_type=DagsterEvent)
    check.str_param(step_key, "step_key")
    check.str_param(output_name, "output_name")
    for event in events:
        if (
            event.event_type == DagsterEventType.STEP_OUTPUT
            and event.step_key == step_key
            and event.step_output_data.output_name == output_name
        ):
            return event
    return None


@whitelist_for_serdes
class AssetObservationData(
    NamedTuple("_AssetObservation", [("asset_observation", AssetObservation)])
):
    def __new__(cls, asset_observation: AssetObservation):
        return super(AssetObservationData, cls).__new__(
            cls,
            asset_observation=check.inst_param(
                asset_observation, "asset_observation", AssetObservation
            ),
        )


@whitelist_for_serdes
class StepMaterializationData(
    NamedTuple(
        "_StepMaterializationData",
        [
            ("materialization", AssetMaterialization),
            ("asset_lineage", Sequence[AssetLineageInfo]),
        ],
    )
):
    def __new__(
        cls,
        materialization: AssetMaterialization,
        asset_lineage: Optional[Sequence[AssetLineageInfo]] = None,
    ):
        return super(StepMaterializationData, cls).__new__(
            cls,
            materialization=check.inst_param(
                materialization, "materialization", AssetMaterialization
            ),
            asset_lineage=check.opt_sequence_param(
                asset_lineage, "asset_lineage", of_type=AssetLineageInfo
            ),
        )


@whitelist_for_serdes
class AssetMaterializationPlannedData(
    NamedTuple(
        "_AssetMaterializationPlannedData",
        [
            ("asset_key", AssetKey),
            ("partition", Optional[str]),
            ("partitions_subset", Optional["PartitionsSubset"]),
        ],
    )
):
    def __new__(
        cls,
        asset_key: AssetKey,
        partition: Optional[str] = None,
        partitions_subset: Optional["PartitionsSubset"] = None,
    ):
        if partitions_subset and partition:
            raise DagsterInvariantViolationError(
                "Cannot provide both partition and partitions_subset"
            )

        if partitions_subset:
            check.opt_inst_param(partitions_subset, "partitions_subset", PartitionsSubset)
            check.invariant(
                is_whitelisted_for_serdes_object(partitions_subset),
                "partitions_subset must be serializable",
            )

        return super(AssetMaterializationPlannedData, cls).__new__(
            cls,
            asset_key=check.inst_param(asset_key, "asset_key", AssetKey),
            partition=check.opt_str_param(partition, "partition"),
            partitions_subset=partitions_subset,
        )


@whitelist_for_serdes
class StepExpectationResultData(
    NamedTuple(
        "_StepExpectationResultData",
        [
            ("expectation_result", ExpectationResult),
        ],
    )
):
    def __new__(cls, expectation_result: ExpectationResult):
        return super(StepExpectationResultData, cls).__new__(
            cls,
            expectation_result=check.inst_param(
                expectation_result, "expectation_result", ExpectationResult
            ),
        )


@whitelist_for_serdes(
    storage_field_names={"metadata": "metadata_entries"},
    field_serializers={"metadata": MetadataFieldSerializer},
)
class ObjectStoreOperationResultData(
    NamedTuple(
        "_ObjectStoreOperationResultData",
        [
            ("op", ObjectStoreOperationType),
            ("value_name", Optional[str]),
            ("metadata", Mapping[str, MetadataValue]),
            ("address", Optional[str]),
            ("version", Optional[str]),
            ("mapping_key", Optional[str]),
        ],
    )
):
    def __new__(
        cls,
        op: ObjectStoreOperationType,
        value_name: Optional[str] = None,
        metadata: Optional[Mapping[str, MetadataValue]] = None,
        address: Optional[str] = None,
        version: Optional[str] = None,
        mapping_key: Optional[str] = None,
    ):
        return super(ObjectStoreOperationResultData, cls).__new__(
            cls,
            op=cast(ObjectStoreOperationType, check.str_param(op, "op")),
            value_name=check.opt_str_param(value_name, "value_name"),
            metadata=normalize_metadata(
                check.opt_mapping_param(metadata, "metadata", key_type=str)
            ),
            address=check.opt_str_param(address, "address"),
            version=check.opt_str_param(version, "version"),
            mapping_key=check.opt_str_param(mapping_key, "mapping_key"),
        )


@whitelist_for_serdes(
    storage_field_names={"metadata": "metadata_entries"},
    field_serializers={"metadata": MetadataFieldSerializer},
)
class EngineEventData(
    NamedTuple(
        "_EngineEventData",
        [
            ("metadata", Mapping[str, MetadataValue]),
            ("error", Optional[SerializableErrorInfo]),
            ("marker_start", Optional[str]),
            ("marker_end", Optional[str]),
        ],
    )
):
    # serdes log
    # * added optional error
    # * added marker_start / marker_end
    #
    def __new__(
        cls,
        metadata: Optional[Mapping[str, RawMetadataValue]] = None,
        error: Optional[SerializableErrorInfo] = None,
        marker_start: Optional[str] = None,
        marker_end: Optional[str] = None,
    ):
        return super(EngineEventData, cls).__new__(
            cls,
            metadata=normalize_metadata(
                check.opt_mapping_param(metadata, "metadata", key_type=str)
            ),
            error=check.opt_inst_param(error, "error", SerializableErrorInfo),
            marker_start=check.opt_str_param(marker_start, "marker_start"),
            marker_end=check.opt_str_param(marker_end, "marker_end"),
        )

    @staticmethod
    def in_process(
        pid: int, step_keys_to_execute: Optional[Sequence[str]] = None
    ) -> "EngineEventData":
        return EngineEventData(
            metadata={
                "pid": MetadataValue.text(str(pid)),
                **(
                    {"step_keys": MetadataValue.text(str(step_keys_to_execute))}
                    if step_keys_to_execute
                    else {}
                ),
            }
        )

    @staticmethod
    def multiprocess(
        pid: int, step_keys_to_execute: Optional[Sequence[str]] = None
    ) -> "EngineEventData":
        return EngineEventData(
            metadata={
                "pid": MetadataValue.text(str(pid)),
                **(
                    {"step_keys": MetadataValue.text(str(step_keys_to_execute))}
                    if step_keys_to_execute
                    else {}
                ),
            }
        )

    @staticmethod
    def interrupted(steps_interrupted: Sequence[str]) -> "EngineEventData":
        return EngineEventData(
            metadata={"steps_interrupted": MetadataValue.text(str(steps_interrupted))}
        )

    @staticmethod
    def engine_error(error: SerializableErrorInfo) -> "EngineEventData":
        return EngineEventData(metadata={}, error=error)


@whitelist_for_serdes(storage_name="PipelineFailureData")
class JobFailureData(
    NamedTuple(
        "_JobFailureData",
        [
            ("error", Optional[SerializableErrorInfo]),
            ("failure_reason", Optional[RunFailureReason]),
            ("first_step_failure_event", Optional["DagsterEvent"]),
        ],
    )
):
    def __new__(
        cls,
        error: Optional[SerializableErrorInfo],
        failure_reason: Optional[RunFailureReason] = None,
        first_step_failure_event: Optional["DagsterEvent"] = None,
    ):
        return super(JobFailureData, cls).__new__(
            cls,
            error=check.opt_inst_param(error, "error", SerializableErrorInfo),
            failure_reason=check.opt_inst_param(failure_reason, "failure_reason", RunFailureReason),
            first_step_failure_event=check.opt_inst_param(
                first_step_failure_event, "first_step_failure_event", DagsterEvent
            ),
        )


@whitelist_for_serdes(storage_name="PipelineCanceledData")
class JobCanceledData(
    NamedTuple(
        "_JobCanceledData",
        [
            ("error", Optional[SerializableErrorInfo]),
        ],
    )
):
    def __new__(cls, error: Optional[SerializableErrorInfo]):
        return super(JobCanceledData, cls).__new__(
            cls, error=check.opt_inst_param(error, "error", SerializableErrorInfo)
        )


@whitelist_for_serdes
class HookErroredData(
    NamedTuple(
        "_HookErroredData",
        [
            ("error", SerializableErrorInfo),
        ],
    )
):
    def __new__(cls, error: SerializableErrorInfo):
        return super(HookErroredData, cls).__new__(
            cls, error=check.inst_param(error, "error", SerializableErrorInfo)
        )


@whitelist_for_serdes(
    storage_field_names={"metadata": "metadata_entries"},
    field_serializers={"metadata": MetadataFieldSerializer},
)
class HandledOutputData(
    NamedTuple(
        "_HandledOutputData",
        [
            ("output_name", str),
            ("manager_key", str),
            ("metadata", Mapping[str, MetadataValue]),
        ],
    )
):
    def __new__(
        cls,
        output_name: str,
        manager_key: str,
        metadata: Optional[Mapping[str, MetadataValue]] = None,
    ):
        return super(HandledOutputData, cls).__new__(
            cls,
            output_name=check.str_param(output_name, "output_name"),
            manager_key=check.str_param(manager_key, "manager_key"),
            metadata=normalize_metadata(
                check.opt_mapping_param(metadata, "metadata", key_type=str)
            ),
        )


@whitelist_for_serdes(
    storage_field_names={"metadata": "metadata_entries"},
    field_serializers={"metadata": MetadataFieldSerializer},
)
class LoadedInputData(
    NamedTuple(
        "_LoadedInputData",
        [
            ("input_name", str),
            ("manager_key", str),
            ("upstream_output_name", Optional[str]),
            ("upstream_step_key", Optional[str]),
            ("metadata", Mapping[str, MetadataValue]),
        ],
    )
):
    def __new__(
        cls,
        input_name: str,
        manager_key: str,
        upstream_output_name: Optional[str] = None,
        upstream_step_key: Optional[str] = None,
        metadata: Optional[Mapping[str, MetadataValue]] = None,
    ):
        return super(LoadedInputData, cls).__new__(
            cls,
            input_name=check.str_param(input_name, "input_name"),
            manager_key=check.str_param(manager_key, "manager_key"),
            upstream_output_name=check.opt_str_param(upstream_output_name, "upstream_output_name"),
            upstream_step_key=check.opt_str_param(upstream_step_key, "upstream_step_key"),
            metadata=normalize_metadata(
                check.opt_mapping_param(metadata, "metadata", key_type=str)
            ),
        )


@whitelist_for_serdes(storage_field_names={"file_key": "log_key"})
class ComputeLogsCaptureData(
    NamedTuple(
        "_ComputeLogsCaptureData",
        [
            ("file_key", str),  # renamed log_key => file_key to avoid confusion
            ("step_keys", Sequence[str]),
            ("external_url", Optional[str]),
            ("external_stdout_url", Optional[str]),
            ("external_stderr_url", Optional[str]),
        ],
    )
):
    def __new__(
        cls,
        file_key: str,
        step_keys: Sequence[str],
        external_url: Optional[str] = None,
        external_stdout_url: Optional[str] = None,
        external_stderr_url: Optional[str] = None,
    ):
        return super(ComputeLogsCaptureData, cls).__new__(
            cls,
            file_key=check.str_param(file_key, "file_key"),
            step_keys=check.opt_list_param(step_keys, "step_keys", of_type=str),
            external_url=check.opt_str_param(external_url, "external_url"),
            external_stdout_url=check.opt_str_param(external_stdout_url, "external_stdout_url"),
            external_stderr_url=check.opt_str_param(external_stderr_url, "external_stderr_url"),
        )


###################################################################################################
# THE GRAVEYARD
#
#            -|-                  -|-                  -|-
#             |                    |                    |
#        _-'~~~~~`-_ .        _-'~~~~~`-_          _-'~~~~~`-_
#      .'           '.      .'           '.      .'           '.
#      |    R I P    |      |    R I P    |      |    R I P    |
#      |             |      |             |      |             |
#      |  Synthetic  |      |    Asset    |      |   Pipeline  |
#      |   Process   |      |    Store    |      |    Init     |
#      |   Events    |      |  Operations |      |   Failures  |
#      |             |      |             |      |             |
###################################################################################################


# Old data structures referenced below
# class AssetStoreOperationData(NamedTuple):
#     op: str
#     step_key: str
#     output_name: str
#     asset_store_key: str
#
#
# class AssetStoreOperationType(Enum):
#     SET_ASSET = "SET_ASSET"
#     GET_ASSET = "GET_ASSET"
#
#
# class PipelineInitFailureData(NamedTuple):
#     error: SerializableErrorInfo


def _handle_back_compat(
    event_type_value: str,
    event_specific_data: Optional[Dict[str, Any]],
) -> Tuple[str, Optional[Dict[str, Any]]]:
    # transform old specific process events in to engine events
    if event_type_value in [
        "PIPELINE_PROCESS_START",
        "PIPELINE_PROCESS_STARTED",
        "PIPELINE_PROCESS_EXITED",
    ]:
        return "ENGINE_EVENT", {"__class__": "EngineEventData"}

    # changes asset store ops in to get/set asset
    elif event_type_value == "ASSET_STORE_OPERATION":
        assert (
            event_specific_data is not None
        ), "ASSET_STORE_OPERATION event must have specific data"
        if event_specific_data["op"] in (
            "GET_ASSET",
            '{"__enum__": "AssetStoreOperationType.GET_ASSET"}',
        ):
            return (
                "LOADED_INPUT",
                {
                    "__class__": "LoadedInputData",
                    "input_name": event_specific_data["output_name"],
                    "manager_key": event_specific_data["asset_store_key"],
                },
            )
        if event_specific_data["op"] in (
            "SET_ASSET",
            '{"__enum__": "AssetStoreOperationType.SET_ASSET"}',
        ):
            return (
                "HANDLED_OUTPUT",
                {
                    "__class__": "HandledOutputData",
                    "output_name": event_specific_data["output_name"],
                    "manager_key": event_specific_data["asset_store_key"],
                },
            )

    # previous name for ASSET_MATERIALIZATION was STEP_MATERIALIZATION
    if event_type_value == "STEP_MATERIALIZATION":
        assert event_specific_data is not None, "STEP_MATERIALIZATION event must have specific data"
        return "ASSET_MATERIALIZATION", event_specific_data

    # transform PIPELINE_INIT_FAILURE to PIPELINE_FAILURE
    if event_type_value == "PIPELINE_INIT_FAILURE":
        assert (
            event_specific_data is not None
        ), "PIPELINE_INIT_FAILURE event must have specific data"
        return "PIPELINE_FAILURE", {
            "__class__": "PipelineFailureData",
            "error": event_specific_data.get("error"),
        }

    return event_type_value, event_specific_data