prefect.client.schemas.objects

Agent

Bases: ObjectBaseModel

An ORM representation of an agent

Source code in src/prefect/client/schemas/objects.py

class Agent(ObjectBaseModel):
    """An ORM representation of an agent"""

    name: str = Field(
        default_factory=lambda: generate_slug(2),
        description=(
            "The name of the agent. If a name is not provided, it will be"
            " auto-generated."
        ),
    )
    work_queue_id: UUID = Field(
        default=..., description="The work queue with which the agent is associated."
    )
    last_activity_time: Optional[DateTime] = Field(
        default=None, description="The last time this agent polled for work."
    )

BlockDocument

Bases: ObjectBaseModel

An ORM representation of a block document.

Source code in src/prefect/client/schemas/objects.py

class BlockDocument(ObjectBaseModel):
    """An ORM representation of a block document."""

    name: Optional[Name] = Field(
        default=None,
        description=(
            "The block document's name. Not required for anonymous block documents."
        ),
    )
    data: Dict[str, Any] = Field(
        default_factory=dict, description="The block document's data"
    )
    block_schema_id: UUID = Field(default=..., description="A block schema ID")
    block_schema: Optional[BlockSchema] = Field(
        default=None, description="The associated block schema"
    )
    block_type_id: UUID = Field(default=..., description="A block type ID")
    block_type_name: Optional[str] = Field(None, description="A block type name")
    block_type: Optional[BlockType] = Field(
        default=None, description="The associated block type"
    )
    block_document_references: Dict[str, Dict[str, Any]] = Field(
        default_factory=dict, description="Record of the block document's references"
    )
    is_anonymous: bool = Field(
        default=False,
        description=(
            "Whether the block is anonymous (anonymous blocks are usually created by"
            " Prefect automatically)"
        ),
    )

    _validate_name_format = field_validator("name")(validate_block_document_name)

    @model_validator(mode="before")
    @classmethod
    def validate_name_is_present_if_not_anonymous(cls, values):
        return validate_name_present_on_nonanonymous_blocks(values)

    @model_serializer(mode="wrap")
    def serialize_data(self, handler, info: SerializationInfo):
        self.data = visit_collection(
            self.data,
            visit_fn=partial(handle_secret_render, context=info.context or {}),
            return_data=True,
        )
        return handler(self)

BlockDocumentReference

Bases: ObjectBaseModel

An ORM representation of a block document reference.

Source code in src/prefect/client/schemas/objects.py

class BlockDocumentReference(ObjectBaseModel):
    """An ORM representation of a block document reference."""

    parent_block_document_id: UUID = Field(
        default=..., description="ID of block document the reference is nested within"
    )
    parent_block_document: Optional[BlockDocument] = Field(
        default=None, description="The block document the reference is nested within"
    )
    reference_block_document_id: UUID = Field(
        default=..., description="ID of the nested block document"
    )
    reference_block_document: Optional[BlockDocument] = Field(
        default=None, description="The nested block document"
    )
    name: str = Field(
        default=..., description="The name that the reference is nested under"
    )

    @model_validator(mode="before")
    @classmethod
    def validate_parent_and_ref_are_different(cls, values):
        if isinstance(values, dict):
            return validate_parent_and_ref_diff(values)
        return values

BlockSchema

Bases: ObjectBaseModel

An ORM representation of a block schema.

Source code in src/prefect/client/schemas/objects.py

class BlockSchema(ObjectBaseModel):
    """An ORM representation of a block schema."""

    checksum: str = Field(default=..., description="The block schema's unique checksum")
    fields: Dict[str, Any] = Field(
        default_factory=dict, description="The block schema's field schema"
    )
    block_type_id: Optional[UUID] = Field(default=..., description="A block type ID")
    block_type: Optional[BlockType] = Field(
        default=None, description="The associated block type"
    )
    capabilities: List[str] = Field(
        default_factory=list,
        description="A list of Block capabilities",
    )
    version: str = Field(
        default=DEFAULT_BLOCK_SCHEMA_VERSION,
        description="Human readable identifier for the block schema",
    )

BlockSchemaReference

Bases: ObjectBaseModel

An ORM representation of a block schema reference.

Source code in src/prefect/client/schemas/objects.py

class BlockSchemaReference(ObjectBaseModel):
    """An ORM representation of a block schema reference."""

    parent_block_schema_id: UUID = Field(
        default=..., description="ID of block schema the reference is nested within"
    )
    parent_block_schema: Optional[BlockSchema] = Field(
        default=None, description="The block schema the reference is nested within"
    )
    reference_block_schema_id: UUID = Field(
        default=..., description="ID of the nested block schema"
    )
    reference_block_schema: Optional[BlockSchema] = Field(
        default=None, description="The nested block schema"
    )
    name: str = Field(
        default=..., description="The name that the reference is nested under"
    )

BlockType

Bases: ObjectBaseModel

An ORM representation of a block type

Source code in src/prefect/client/schemas/objects.py

class BlockType(ObjectBaseModel):
    """An ORM representation of a block type"""

    name: Name = Field(default=..., description="A block type's name")
    slug: str = Field(default=..., description="A block type's slug")
    logo_url: Optional[HttpUrl] = Field(
        default=None, description="Web URL for the block type's logo"
    )
    documentation_url: Optional[HttpUrl] = Field(
        default=None, description="Web URL for the block type's documentation"
    )
    description: Optional[str] = Field(
        default=None,
        description="A short blurb about the corresponding block's intended use",
    )
    code_example: Optional[str] = Field(
        default=None,
        description="A code snippet demonstrating use of the corresponding block",
    )
    is_protected: bool = Field(
        default=False, description="Protected block types cannot be modified via API."
    )

ConcurrencyLimit

Bases: ObjectBaseModel

An ORM representation of a concurrency limit.

Source code in src/prefect/client/schemas/objects.py

class ConcurrencyLimit(ObjectBaseModel):
    """An ORM representation of a concurrency limit."""

    tag: str = Field(
        default=..., description="A tag the concurrency limit is applied to."
    )
    concurrency_limit: int = Field(default=..., description="The concurrency limit.")
    active_slots: List[UUID] = Field(
        default_factory=list,
        description="A list of active run ids using a concurrency slot",
    )

Configuration

Bases: ObjectBaseModel

An ORM representation of account info.

Source code in src/prefect/client/schemas/objects.py

class Configuration(ObjectBaseModel):
    """An ORM representation of account info."""

    key: str = Field(default=..., description="Account info key")
    value: Dict[str, Any] = Field(default=..., description="Account info")

Constant

Bases: TaskRunInput

Represents constant input value to a task run.

Source code in src/prefect/client/schemas/objects.py

class Constant(TaskRunInput):
    """Represents constant input value to a task run."""

    input_type: Literal["constant"] = "constant"
    type: str

Deployment

Bases: ObjectBaseModel

An ORM representation of deployment data.

Source code in src/prefect/client/schemas/objects.py

class Deployment(ObjectBaseModel):
    """An ORM representation of deployment data."""

    name: Name = Field(default=..., description="The name of the deployment.")
    version: Optional[str] = Field(
        default=None, description="An optional version for the deployment."
    )
    description: Optional[str] = Field(
        default=None, description="A description for the deployment."
    )
    flow_id: UUID = Field(
        default=..., description="The flow id associated with the deployment."
    )
    schedule: Optional[SCHEDULE_TYPES] = Field(
        default=None, description="A schedule for the deployment."
    )
    is_schedule_active: bool = Field(
        default=True, description="Whether or not the deployment schedule is active."
    )
    paused: bool = Field(
        default=False, description="Whether or not the deployment is paused."
    )
    schedules: List[DeploymentSchedule] = Field(
        default_factory=list, description="A list of schedules for the deployment."
    )
    job_variables: Dict[str, Any] = Field(
        default_factory=dict,
        description="Overrides to apply to flow run infrastructure at runtime.",
    )
    parameters: Dict[str, Any] = Field(
        default_factory=dict,
        description="Parameters for flow runs scheduled by the deployment.",
    )
    pull_steps: Optional[List[dict]] = Field(
        default=None,
        description="Pull steps for cloning and running this deployment.",
    )
    tags: List[str] = Field(
        default_factory=list,
        description="A list of tags for the deployment",
        examples=[["tag-1", "tag-2"]],
    )
    work_queue_name: Optional[str] = Field(
        default=None,
        description=(
            "The work queue for the deployment. If no work queue is set, work will not"
            " be scheduled."
        ),
    )
    last_polled: Optional[DateTime] = Field(
        default=None,
        description="The last time the deployment was polled for status updates.",
    )
    parameter_openapi_schema: Optional[Dict[str, Any]] = Field(
        default=None,
        description="The parameter schema of the flow, including defaults.",
    )
    path: Optional[str] = Field(
        default=None,
        description=(
            "The path to the working directory for the workflow, relative to remote"
            " storage or an absolute path."
        ),
    )
    entrypoint: Optional[str] = Field(
        default=None,
        description=(
            "The path to the entrypoint for the workflow, relative to the `path`."
        ),
    )
    storage_document_id: Optional[UUID] = Field(
        default=None,
        description="The block document defining storage used for this flow.",
    )
    infrastructure_document_id: Optional[UUID] = Field(
        default=None,
        description="The block document defining infrastructure to use for flow runs.",
    )
    created_by: Optional[CreatedBy] = Field(
        default=None,
        description="Optional information about the creator of this deployment.",
    )
    updated_by: Optional[UpdatedBy] = Field(
        default=None,
        description="Optional information about the updater of this deployment.",
    )
    work_queue_id: Optional[UUID] = Field(
        default=None,
        description=(
            "The id of the work pool queue to which this deployment is assigned."
        ),
    )
    enforce_parameter_schema: bool = Field(
        default=True,
        description=(
            "Whether or not the deployment should enforce the parameter schema."
        ),
    )

DeploymentStatus

Bases: AutoEnum

Enumeration of deployment statuses.

Source code in src/prefect/client/schemas/objects.py

class DeploymentStatus(AutoEnum):
    """Enumeration of deployment statuses."""

    READY = AutoEnum.auto()
    NOT_READY = AutoEnum.auto()

Flow

Bases: ObjectBaseModel

An ORM representation of flow data.

Source code in src/prefect/client/schemas/objects.py

class Flow(ObjectBaseModel):
    """An ORM representation of flow data."""

    name: Name = Field(
        default=..., description="The name of the flow", examples=["my-flow"]
    )
    tags: List[str] = Field(
        default_factory=list,
        description="A list of flow tags",
        examples=[["tag-1", "tag-2"]],
    )

FlowRun

Bases: ObjectBaseModel

Source code in src/prefect/client/schemas/objects.py

class FlowRun(ObjectBaseModel):
    name: str = Field(
        default_factory=lambda: generate_slug(2),
        description=(
            "The name of the flow run. Defaults to a random slug if not specified."
        ),
        examples=["my-flow-run"],
    )
    flow_id: UUID = Field(default=..., description="The id of the flow being run.")
    state_id: Optional[UUID] = Field(
        default=None, description="The id of the flow run's current state."
    )
    deployment_id: Optional[UUID] = Field(
        default=None,
        description=(
            "The id of the deployment associated with this flow run, if available."
        ),
    )
    deployment_version: Optional[str] = Field(
        default=None,
        description="The version of the deployment associated with this flow run.",
        examples=["1.0"],
    )
    work_queue_name: Optional[str] = Field(
        default=None, description="The work queue that handled this flow run."
    )
    flow_version: Optional[str] = Field(
        default=None,
        description="The version of the flow executed in this flow run.",
        examples=["1.0"],
    )
    parameters: Dict[str, Any] = Field(
        default_factory=dict, description="Parameters for the flow run."
    )
    idempotency_key: Optional[str] = Field(
        default=None,
        description=(
            "An optional idempotency key for the flow run. Used to ensure the same flow"
            " run is not created multiple times."
        ),
    )
    context: Dict[str, Any] = Field(
        default_factory=dict,
        description="Additional context for the flow run.",
        examples=[{"my_var": "my_val"}],
    )
    empirical_policy: FlowRunPolicy = Field(
        default_factory=FlowRunPolicy,
    )
    tags: List[str] = Field(
        default_factory=list,
        description="A list of tags on the flow run",
        examples=[["tag-1", "tag-2"]],
    )
    parent_task_run_id: Optional[UUID] = Field(
        default=None,
        description=(
            "If the flow run is a subflow, the id of the 'dummy' task in the parent"
            " flow used to track subflow state."
        ),
    )
    run_count: int = Field(
        default=0, description="The number of times the flow run was executed."
    )
    expected_start_time: Optional[DateTime] = Field(
        default=None,
        description="The flow run's expected start time.",
    )
    next_scheduled_start_time: Optional[DateTime] = Field(
        default=None,
        description="The next time the flow run is scheduled to start.",
    )
    start_time: Optional[DateTime] = Field(
        default=None, description="The actual start time."
    )
    end_time: Optional[DateTime] = Field(
        default=None, description="The actual end time."
    )
    total_run_time: datetime.timedelta = Field(
        default=datetime.timedelta(0),
        description=(
            "Total run time. If the flow run was executed multiple times, the time of"
            " each run will be summed."
        ),
    )
    estimated_run_time: datetime.timedelta = Field(
        default=datetime.timedelta(0),
        description="A real-time estimate of the total run time.",
    )
    estimated_start_time_delta: datetime.timedelta = Field(
        default=datetime.timedelta(0),
        description="The difference between actual and expected start time.",
    )
    auto_scheduled: bool = Field(
        default=False,
        description="Whether or not the flow run was automatically scheduled.",
    )
    infrastructure_document_id: Optional[UUID] = Field(
        default=None,
        description="The block document defining infrastructure to use this flow run.",
    )
    infrastructure_pid: Optional[str] = Field(
        default=None,
        description="The id of the flow run as returned by an infrastructure block.",
    )
    created_by: Optional[CreatedBy] = Field(
        default=None,
        description="Optional information about the creator of this flow run.",
    )
    work_queue_id: Optional[UUID] = Field(
        default=None, description="The id of the run's work pool queue."
    )

    work_pool_id: Optional[UUID] = Field(
        default=None, description="The work pool with which the queue is associated."
    )
    work_pool_name: Optional[str] = Field(
        default=None,
        description="The name of the flow run's work pool.",
        examples=["my-work-pool"],
    )
    state: Optional[State] = Field(
        default=None,
        description="The state of the flow run.",
        examples=["State(type=StateType.COMPLETED)"],
    )
    job_variables: Optional[dict] = Field(
        default=None,
        description="Job variables for the flow run.",
    )

    # These are server-side optimizations and should not be present on client models
    # TODO: Deprecate these fields

    state_type: Optional[StateType] = Field(
        default=None, description="The type of the current flow run state."
    )
    state_name: Optional[str] = Field(
        default=None, description="The name of the current flow run state."
    )

    def __eq__(self, other: Any) -> bool:
        """
        Check for "equality" to another flow run schema

        Estimates times are rolling and will always change with repeated queries for
        a flow run so we ignore them during equality checks.
        """
        if isinstance(other, FlowRun):
            exclude_fields = {"estimated_run_time", "estimated_start_time_delta"}
            return self.model_dump(exclude=exclude_fields) == other.model_dump(
                exclude=exclude_fields
            )
        return super().__eq__(other)

    @field_validator("name", mode="before")
    @classmethod
    def set_default_name(cls, name):
        return get_or_create_run_name(name)

__eq__(other)

Check for "equality" to another flow run schema

Estimates times are rolling and will always change with repeated queries for a flow run so we ignore them during equality checks.

Source code in src/prefect/client/schemas/objects.py

def __eq__(self, other: Any) -> bool:
    """
    Check for "equality" to another flow run schema

    Estimates times are rolling and will always change with repeated queries for
    a flow run so we ignore them during equality checks.
    """
    if isinstance(other, FlowRun):
        exclude_fields = {"estimated_run_time", "estimated_start_time_delta"}
        return self.model_dump(exclude=exclude_fields) == other.model_dump(
            exclude=exclude_fields
        )
    return super().__eq__(other)

FlowRunInput

Bases: ObjectBaseModel

Source code in src/prefect/client/schemas/objects.py

class FlowRunInput(ObjectBaseModel):
    flow_run_id: UUID = Field(description="The flow run ID associated with the input.")
    key: str = Field(description="The key of the input.")
    value: str = Field(description="The value of the input.")
    sender: Optional[str] = Field(default=None, description="The sender of the input.")

    @property
    def decoded_value(self) -> Any:
        """
        Decode the value of the input.

        Returns:
            Any: the decoded value
        """
        return orjson.loads(self.value)

    @field_validator("key", check_fields=False)
    @classmethod
    def validate_name_characters(cls, v):
        raise_on_name_alphanumeric_dashes_only(v)
        return v

decoded_value: Any property

Decode the value of the input.

Returns:

Name	Type	Description
Any	Any	the decoded value

FlowRunNotificationPolicy

Bases: ObjectBaseModel

An ORM representation of a flow run notification.

Source code in src/prefect/client/schemas/objects.py

class FlowRunNotificationPolicy(ObjectBaseModel):
    """An ORM representation of a flow run notification."""

    is_active: bool = Field(
        default=True, description="Whether the policy is currently active"
    )
    state_names: List[str] = Field(
        default=..., description="The flow run states that trigger notifications"
    )
    tags: List[str] = Field(
        default=...,
        description="The flow run tags that trigger notifications (set [] to disable)",
    )
    block_document_id: UUID = Field(
        default=..., description="The block document ID used for sending notifications"
    )
    message_template: Optional[str] = Field(
        default=None,
        description=(
            "A templatable notification message. Use {braces} to add variables."
            " Valid variables include:"
            f" {listrepr(sorted(FLOW_RUN_NOTIFICATION_TEMPLATE_KWARGS), sep=', ')}"
        ),
        examples=[
            "Flow run {flow_run_name} with id {flow_run_id} entered state"
            " {flow_run_state_name}."
        ],
    )

    @field_validator("message_template")
    @classmethod
    def validate_message_template_variables(cls, v):
        return validate_message_template_variables(v)

FlowRunPolicy

Bases: PrefectBaseModel

Defines of how a flow run should be orchestrated.

Source code in src/prefect/client/schemas/objects.py

class FlowRunPolicy(PrefectBaseModel):
    """Defines of how a flow run should be orchestrated."""

    max_retries: int = Field(
        default=0,
        description=(
            "The maximum number of retries. Field is not used. Please use `retries`"
            " instead."
        ),
        deprecated=True,
    )
    retry_delay_seconds: float = Field(
        default=0,
        description=(
            "The delay between retries. Field is not used. Please use `retry_delay`"
            " instead."
        ),
        deprecated=True,
    )
    retries: Optional[int] = Field(default=None, description="The number of retries.")
    retry_delay: Optional[int] = Field(
        default=None, description="The delay time between retries, in seconds."
    )
    pause_keys: Optional[set] = Field(
        default_factory=set, description="Tracks pauses this run has observed."
    )
    resuming: Optional[bool] = Field(
        default=False, description="Indicates if this run is resuming from a pause."
    )

    @model_validator(mode="before")
    @classmethod
    def populate_deprecated_fields(cls, values: Any):
        if isinstance(values, dict):
            return set_run_policy_deprecated_fields(values)
        return values

GlobalConcurrencyLimit

Bases: ObjectBaseModel

An ORM representation of a global concurrency limit

Source code in src/prefect/client/schemas/objects.py

class GlobalConcurrencyLimit(ObjectBaseModel):
    """An ORM representation of a global concurrency limit"""

    name: str = Field(description="The name of the global concurrency limit.")
    limit: int = Field(
        description=(
            "The maximum number of slots that can be occupied on this concurrency"
            " limit."
        )
    )
    active: Optional[bool] = Field(
        default=True,
        description="Whether or not the concurrency limit is in an active state.",
    )
    active_slots: Optional[int] = Field(
        default=0,
        description="Number of tasks currently using a concurrency slot.",
    )
    slot_decay_per_second: Optional[float] = Field(
        default=0.0,
        description=(
            "Controls the rate at which slots are released when the concurrency limit"
            " is used as a rate limit."
        ),
    )

Log

Bases: ObjectBaseModel

An ORM representation of log data.

Source code in src/prefect/client/schemas/objects.py

class Log(ObjectBaseModel):
    """An ORM representation of log data."""

    name: str = Field(default=..., description="The logger name.")
    level: int = Field(default=..., description="The log level.")
    message: str = Field(default=..., description="The log message.")
    timestamp: DateTime = Field(default=..., description="The log timestamp.")
    flow_run_id: Optional[UUID] = Field(
        default=None, description="The flow run ID associated with the log."
    )
    task_run_id: Optional[UUID] = Field(
        default=None, description="The task run ID associated with the log."
    )

Parameter

Bases: TaskRunInput

Represents a parameter input to a task run.

Source code in src/prefect/client/schemas/objects.py

class Parameter(TaskRunInput):
    """Represents a parameter input to a task run."""

    input_type: Literal["parameter"] = "parameter"
    name: str

QueueFilter

Bases: PrefectBaseModel

Filter criteria definition for a work queue.

Source code in src/prefect/client/schemas/objects.py

class QueueFilter(PrefectBaseModel):
    """Filter criteria definition for a work queue."""

    tags: Optional[List[str]] = Field(
        default=None,
        description="Only include flow runs with these tags in the work queue.",
    )
    deployment_ids: Optional[List[UUID]] = Field(
        default=None,
        description="Only include flow runs from these deployments in the work queue.",
    )

SavedSearch

Bases: ObjectBaseModel

An ORM representation of saved search data. Represents a set of filter criteria.

Source code in src/prefect/client/schemas/objects.py

class SavedSearch(ObjectBaseModel):
    """An ORM representation of saved search data. Represents a set of filter criteria."""

    name: str = Field(default=..., description="The name of the saved search.")
    filters: List[SavedSearchFilter] = Field(
        default_factory=list, description="The filter set for the saved search."
    )

SavedSearchFilter

Bases: PrefectBaseModel

A filter for a saved search model. Intended for use by the Prefect UI.

Source code in src/prefect/client/schemas/objects.py

class SavedSearchFilter(PrefectBaseModel):
    """A filter for a saved search model. Intended for use by the Prefect UI."""

    object: str = Field(default=..., description="The object over which to filter.")
    property: str = Field(
        default=..., description="The property of the object on which to filter."
    )
    type: str = Field(default=..., description="The type of the property.")
    operation: str = Field(
        default=...,
        description="The operator to apply to the object. For example, `equals`.",
    )
    value: Any = Field(
        default=..., description="A JSON-compatible value for the filter."
    )

State

Bases: ObjectBaseModel, Generic[R]

The state of a run.

Source code in src/prefect/client/schemas/objects.py

class State(ObjectBaseModel, Generic[R]):
    """
    The state of a run.
    """

    type: StateType
    name: Optional[str] = Field(default=None)
    timestamp: DateTime = Field(default_factory=lambda: pendulum.now("UTC"))
    message: Optional[str] = Field(default=None, examples=["Run started"])
    state_details: StateDetails = Field(default_factory=StateDetails)
    data: Union["BaseResult[R]", Any] = Field(
        default=None,
    )

    @overload
    def result(self: "State[R]", raise_on_failure: bool = True) -> R:
        ...

    @overload
    def result(self: "State[R]", raise_on_failure: bool = False) -> Union[R, Exception]:
        ...

    def result(
        self,
        raise_on_failure: bool = True,
        fetch: Optional[bool] = None,
        retry_result_failure: bool = True,
    ) -> Union[R, Exception]:
        """
        Retrieve the result attached to this state.

        Args:
            raise_on_failure: a boolean specifying whether to raise an exception
                if the state is of type `FAILED` and the underlying data is an exception
            fetch: a boolean specifying whether to resolve references to persisted
                results into data. For synchronous users, this defaults to `True`.
                For asynchronous users, this defaults to `False` for backwards
                compatibility.
            retry_result_failure: a boolean specifying whether to retry on failures to
                load the result from result storage

        Raises:
            TypeError: If the state is failed but the result is not an exception.

        Returns:
            The result of the run

        Examples:
            >>> from prefect import flow, task
            >>> @task
            >>> def my_task(x):
            >>>     return x

            Get the result from a task future in a flow

            >>> @flow
            >>> def my_flow():
            >>>     future = my_task("hello")
            >>>     state = future.wait()
            >>>     result = state.result()
            >>>     print(result)
            >>> my_flow()
            hello

            Get the result from a flow state

            >>> @flow
            >>> def my_flow():
            >>>     return "hello"
            >>> my_flow(return_state=True).result()
            hello

            Get the result from a failed state

            >>> @flow
            >>> def my_flow():
            >>>     raise ValueError("oh no!")
            >>> state = my_flow(return_state=True)  # Error is wrapped in FAILED state
            >>> state.result()  # Raises `ValueError`

            Get the result from a failed state without erroring

            >>> @flow
            >>> def my_flow():
            >>>     raise ValueError("oh no!")
            >>> state = my_flow(return_state=True)
            >>> result = state.result(raise_on_failure=False)
            >>> print(result)
            ValueError("oh no!")


            Get the result from a flow state in an async context

            >>> @flow
            >>> async def my_flow():
            >>>     return "hello"
            >>> state = await my_flow(return_state=True)
            >>> await state.result()
            hello
        """
        from prefect.states import get_state_result

        return get_state_result(
            self,
            raise_on_failure=raise_on_failure,
            fetch=fetch,
            retry_result_failure=retry_result_failure,
        )

    def to_state_create(self):
        """
        Convert this state to a `StateCreate` type which can be used to set the state of
        a run in the API.

        This method will drop this state's `data` if it is not a result type. Only
        results should be sent to the API. Other data is only available locally.
        """
        from prefect.client.schemas.actions import StateCreate
        from prefect.results import BaseResult

        return StateCreate(
            type=self.type,
            name=self.name,
            message=self.message,
            data=self.data if isinstance(self.data, BaseResult) else None,
            state_details=self.state_details,
        )

    @model_validator(mode="after")
    def default_name_from_type(self) -> Self:
        """If a name is not provided, use the type"""
        # if `type` is not in `values` it means the `type` didn't pass its own
        # validation check and an error will be raised after this function is called
        name = self.name
        if name is None and self.type:
            self.name = " ".join([v.capitalize() for v in self.type.value.split("_")])
        return self

    @model_validator(mode="after")
    def default_scheduled_start_time(self) -> Self:
        if self.type == StateType.SCHEDULED:
            if not self.state_details.scheduled_time:
                self.state_details.scheduled_time = DateTime.now("utc")
        return self

    def is_scheduled(self) -> bool:
        return self.type == StateType.SCHEDULED

    def is_pending(self) -> bool:
        return self.type == StateType.PENDING

    def is_running(self) -> bool:
        return self.type == StateType.RUNNING

    def is_completed(self) -> bool:
        return self.type == StateType.COMPLETED

    def is_failed(self) -> bool:
        return self.type == StateType.FAILED

    def is_crashed(self) -> bool:
        return self.type == StateType.CRASHED

    def is_cancelled(self) -> bool:
        return self.type == StateType.CANCELLED

    def is_cancelling(self) -> bool:
        return self.type == StateType.CANCELLING

    def is_final(self) -> bool:
        return self.type in TERMINAL_STATES

    def is_paused(self) -> bool:
        return self.type == StateType.PAUSED

    def model_copy(
        self, *, update: Optional[Dict[str, Any]] = None, deep: bool = False
    ):
        """
        Copying API models should return an object that could be inserted into the
        database again. The 'timestamp' is reset using the default factory.
        """
        update = update or {}
        update.setdefault("timestamp", self.model_fields["timestamp"].get_default())
        return super().model_copy(update=update, deep=deep)

    def fresh_copy(self, **kwargs) -> Self:
        """
        Return a fresh copy of the state with a new ID.
        """
        return self.model_copy(
            update={
                "id": uuid4(),
                "created": pendulum.now("utc"),
                "updated": pendulum.now("utc"),
                "timestamp": pendulum.now("utc"),
            },
            **kwargs,
        )

    def __repr__(self) -> str:
        """
        Generates a complete state representation appropriate for introspection
        and debugging, including the result:

        `MyCompletedState(message="my message", type=COMPLETED, result=...)`
        """
        result = self.data

        display = dict(
            message=repr(self.message),
            type=str(self.type.value),
            result=repr(result),
        )

        return f"{self.name}({', '.join(f'{k}={v}' for k, v in display.items())})"

    def __str__(self) -> str:
        """
        Generates a simple state representation appropriate for logging:

        `MyCompletedState("my message", type=COMPLETED)`
        """

        display = []

        if self.message:
            display.append(repr(self.message))

        if self.type.value.lower() != self.name.lower():
            display.append(f"type={self.type.value}")

        return f"{self.name}({', '.join(display)})"

    def __hash__(self) -> int:
        return hash(
            (
                getattr(self.state_details, "flow_run_id", None),
                getattr(self.state_details, "task_run_id", None),
                self.timestamp,
                self.type,
            )
        )

__repr__()

Generates a complete state representation appropriate for introspection and debugging, including the result:

MyCompletedState(message="my message", type=COMPLETED, result=...)

Source code in src/prefect/client/schemas/objects.py

def __repr__(self) -> str:
    """
    Generates a complete state representation appropriate for introspection
    and debugging, including the result:

    `MyCompletedState(message="my message", type=COMPLETED, result=...)`
    """
    result = self.data

    display = dict(
        message=repr(self.message),
        type=str(self.type.value),
        result=repr(result),
    )

    return f"{self.name}({', '.join(f'{k}={v}' for k, v in display.items())})"

__str__()

Generates a simple state representation appropriate for logging:

MyCompletedState("my message", type=COMPLETED)

Source code in src/prefect/client/schemas/objects.py

def __str__(self) -> str:
    """
    Generates a simple state representation appropriate for logging:

    `MyCompletedState("my message", type=COMPLETED)`
    """

    display = []

    if self.message:
        display.append(repr(self.message))

    if self.type.value.lower() != self.name.lower():
        display.append(f"type={self.type.value}")

    return f"{self.name}({', '.join(display)})"

default_name_from_type()

If a name is not provided, use the type

Source code in src/prefect/client/schemas/objects.py

@model_validator(mode="after")
def default_name_from_type(self) -> Self:
    """If a name is not provided, use the type"""
    # if `type` is not in `values` it means the `type` didn't pass its own
    # validation check and an error will be raised after this function is called
    name = self.name
    if name is None and self.type:
        self.name = " ".join([v.capitalize() for v in self.type.value.split("_")])
    return self

fresh_copy(**kwargs)

Return a fresh copy of the state with a new ID.

Source code in src/prefect/client/schemas/objects.py

def fresh_copy(self, **kwargs) -> Self:
    """
    Return a fresh copy of the state with a new ID.
    """
    return self.model_copy(
        update={
            "id": uuid4(),
            "created": pendulum.now("utc"),
            "updated": pendulum.now("utc"),
            "timestamp": pendulum.now("utc"),
        },
        **kwargs,
    )

model_copy(*, update=None, deep=False)

Copying API models should return an object that could be inserted into the database again. The 'timestamp' is reset using the default factory.

Source code in src/prefect/client/schemas/objects.py

def model_copy(
    self, *, update: Optional[Dict[str, Any]] = None, deep: bool = False
):
    """
    Copying API models should return an object that could be inserted into the
    database again. The 'timestamp' is reset using the default factory.
    """
    update = update or {}
    update.setdefault("timestamp", self.model_fields["timestamp"].get_default())
    return super().model_copy(update=update, deep=deep)

result(raise_on_failure=True, fetch=None, retry_result_failure=True)

Retrieve the result attached to this state.

Parameters:

Name	Type	Description	Default
raise_on_failure	bool	a boolean specifying whether to raise an exception if the state is of type FAILED and the underlying data is an exception	True
fetch	Optional[bool]	a boolean specifying whether to resolve references to persisted results into data. For synchronous users, this defaults to True. For asynchronous users, this defaults to False for backwards compatibility.	None
retry_result_failure	bool	a boolean specifying whether to retry on failures to load the result from result storage	True

Raises:

Type	Description
TypeError	If the state is failed but the result is not an exception.

Returns:

Type	Description
Union[R, Exception]	The result of the run

Examples:

>>> from prefect import flow, task
>>> @task
>>> def my_task(x):
>>>     return x

Get the result from a task future in a flow

>>> @flow
>>> def my_flow():
>>>     future = my_task("hello")
>>>     state = future.wait()
>>>     result = state.result()
>>>     print(result)
>>> my_flow()
hello

Get the result from a flow state

>>> @flow
>>> def my_flow():
>>>     return "hello"
>>> my_flow(return_state=True).result()
hello

Get the result from a failed state

>>> @flow
>>> def my_flow():
>>>     raise ValueError("oh no!")
>>> state = my_flow(return_state=True)  # Error is wrapped in FAILED state
>>> state.result()  # Raises `ValueError`

Get the result from a failed state without erroring

>>> @flow
>>> def my_flow():
>>>     raise ValueError("oh no!")
>>> state = my_flow(return_state=True)
>>> result = state.result(raise_on_failure=False)
>>> print(result)
ValueError("oh no!")

Get the result from a flow state in an async context

>>> @flow
>>> async def my_flow():
>>>     return "hello"
>>> state = await my_flow(return_state=True)
>>> await state.result()
hello

Source code in src/prefect/client/schemas/objects.py

def result(
    self,
    raise_on_failure: bool = True,
    fetch: Optional[bool] = None,
    retry_result_failure: bool = True,
) -> Union[R, Exception]:
    """
    Retrieve the result attached to this state.

    Args:
        raise_on_failure: a boolean specifying whether to raise an exception
            if the state is of type `FAILED` and the underlying data is an exception
        fetch: a boolean specifying whether to resolve references to persisted
            results into data. For synchronous users, this defaults to `True`.
            For asynchronous users, this defaults to `False` for backwards
            compatibility.
        retry_result_failure: a boolean specifying whether to retry on failures to
            load the result from result storage

    Raises:
        TypeError: If the state is failed but the result is not an exception.

    Returns:
        The result of the run

    Examples:
        >>> from prefect import flow, task
        >>> @task
        >>> def my_task(x):
        >>>     return x

        Get the result from a task future in a flow

        >>> @flow
        >>> def my_flow():
        >>>     future = my_task("hello")
        >>>     state = future.wait()
        >>>     result = state.result()
        >>>     print(result)
        >>> my_flow()
        hello

        Get the result from a flow state

        >>> @flow
        >>> def my_flow():
        >>>     return "hello"
        >>> my_flow(return_state=True).result()
        hello

        Get the result from a failed state

        >>> @flow
        >>> def my_flow():
        >>>     raise ValueError("oh no!")
        >>> state = my_flow(return_state=True)  # Error is wrapped in FAILED state
        >>> state.result()  # Raises `ValueError`

        Get the result from a failed state without erroring

        >>> @flow
        >>> def my_flow():
        >>>     raise ValueError("oh no!")
        >>> state = my_flow(return_state=True)
        >>> result = state.result(raise_on_failure=False)
        >>> print(result)
        ValueError("oh no!")


        Get the result from a flow state in an async context

        >>> @flow
        >>> async def my_flow():
        >>>     return "hello"
        >>> state = await my_flow(return_state=True)
        >>> await state.result()
        hello
    """
    from prefect.states import get_state_result

    return get_state_result(
        self,
        raise_on_failure=raise_on_failure,
        fetch=fetch,
        retry_result_failure=retry_result_failure,
    )

to_state_create()

Convert this state to a StateCreate type which can be used to set the state of a run in the API.

This method will drop this state's data if it is not a result type. Only results should be sent to the API. Other data is only available locally.

Source code in src/prefect/client/schemas/objects.py

def to_state_create(self):
    """
    Convert this state to a `StateCreate` type which can be used to set the state of
    a run in the API.

    This method will drop this state's `data` if it is not a result type. Only
    results should be sent to the API. Other data is only available locally.
    """
    from prefect.client.schemas.actions import StateCreate
    from prefect.results import BaseResult

    return StateCreate(
        type=self.type,
        name=self.name,
        message=self.message,
        data=self.data if isinstance(self.data, BaseResult) else None,
        state_details=self.state_details,
    )

StateType

Bases: AutoEnum

Enumeration of state types.

Source code in src/prefect/client/schemas/objects.py

class StateType(AutoEnum):
    """Enumeration of state types."""

    SCHEDULED = AutoEnum.auto()
    PENDING = AutoEnum.auto()
    RUNNING = AutoEnum.auto()
    COMPLETED = AutoEnum.auto()
    FAILED = AutoEnum.auto()
    CANCELLED = AutoEnum.auto()
    CRASHED = AutoEnum.auto()
    PAUSED = AutoEnum.auto()
    CANCELLING = AutoEnum.auto()

TaskRunInput

Bases: PrefectBaseModel

Base class for classes that represent inputs to task runs, which could include, constants, parameters, or other task runs.

Source code in src/prefect/client/schemas/objects.py

class TaskRunInput(PrefectBaseModel):
    """
    Base class for classes that represent inputs to task runs, which
    could include, constants, parameters, or other task runs.
    """

    model_config = ConfigDict(frozen=True)

    input_type: str

TaskRunPolicy

Bases: PrefectBaseModel

Defines of how a task run should retry.

Source code in src/prefect/client/schemas/objects.py

class TaskRunPolicy(PrefectBaseModel):
    """Defines of how a task run should retry."""

    max_retries: int = Field(
        default=0,
        description=(
            "The maximum number of retries. Field is not used. Please use `retries`"
            " instead."
        ),
        deprecated=True,
    )
    retry_delay_seconds: float = Field(
        default=0,
        description=(
            "The delay between retries. Field is not used. Please use `retry_delay`"
            " instead."
        ),
        deprecated=True,
    )
    retries: Optional[int] = Field(default=None, description="The number of retries.")
    retry_delay: Union[None, int, List[int]] = Field(
        default=None,
        description="A delay time or list of delay times between retries, in seconds.",
    )
    retry_jitter_factor: Optional[float] = Field(
        default=None, description="Determines the amount a retry should jitter"
    )

    @model_validator(mode="after")
    def populate_deprecated_fields(self):
        """
        If deprecated fields are provided, populate the corresponding new fields
        to preserve orchestration behavior.
        """
        # We have marked these fields as deprecated, so we need to filter out the
        # deprecation warnings _we're_ generating here
        with warnings.catch_warnings():
            warnings.simplefilter("ignore", DeprecationWarning)

            if not self.retries and self.max_retries != 0:
                self.retries = self.max_retries

            if not self.retry_delay and self.retry_delay_seconds != 0:
                self.retry_delay = self.retry_delay_seconds

        return self

    @field_validator("retry_delay")
    @classmethod
    def validate_configured_retry_delays(cls, v):
        return list_length_50_or_less(v)

    @field_validator("retry_jitter_factor")
    @classmethod
    def validate_jitter_factor(cls, v):
        return validate_not_negative(v)

populate_deprecated_fields()

If deprecated fields are provided, populate the corresponding new fields to preserve orchestration behavior.

Source code in src/prefect/client/schemas/objects.py

@model_validator(mode="after")
def populate_deprecated_fields(self):
    """
    If deprecated fields are provided, populate the corresponding new fields
    to preserve orchestration behavior.
    """
    # We have marked these fields as deprecated, so we need to filter out the
    # deprecation warnings _we're_ generating here
    with warnings.catch_warnings():
        warnings.simplefilter("ignore", DeprecationWarning)

        if not self.retries and self.max_retries != 0:
            self.retries = self.max_retries

        if not self.retry_delay and self.retry_delay_seconds != 0:
            self.retry_delay = self.retry_delay_seconds

    return self

TaskRunResult

Bases: TaskRunInput

Represents a task run result input to another task run.

Source code in src/prefect/client/schemas/objects.py

class TaskRunResult(TaskRunInput):
    """Represents a task run result input to another task run."""

    input_type: Literal["task_run"] = "task_run"
    id: UUID

WorkPool

Bases: ObjectBaseModel

An ORM representation of a work pool

Source code in src/prefect/client/schemas/objects.py

class WorkPool(ObjectBaseModel):
    """An ORM representation of a work pool"""

    name: Name = Field(
        description="The name of the work pool.",
    )
    description: Optional[str] = Field(
        default=None, description="A description of the work pool."
    )
    type: str = Field(description="The work pool type.")
    base_job_template: Dict[str, Any] = Field(
        default_factory=dict, description="The work pool's base job template."
    )
    is_paused: bool = Field(
        default=False,
        description="Pausing the work pool stops the delivery of all work.",
    )
    concurrency_limit: Optional[NonNegativeInteger] = Field(
        default=None, description="A concurrency limit for the work pool."
    )
    status: Optional[WorkPoolStatus] = Field(
        default=None, description="The current status of the work pool."
    )

    # this required field has a default of None so that the custom validator
    # below will be called and produce a more helpful error message
    default_queue_id: UUID = Field(
        None, description="The id of the pool's default queue."
    )

    @property
    def is_push_pool(self) -> bool:
        return self.type.endswith(":push")

    @property
    def is_managed_pool(self) -> bool:
        return self.type.endswith(":managed")

    @field_validator("default_queue_id")
    @classmethod
    def helpful_error_for_missing_default_queue_id(cls, v):
        return validate_default_queue_id_not_none(v)

WorkPoolStatus

Bases: AutoEnum

Enumeration of work pool statuses.

Source code in src/prefect/client/schemas/objects.py

class WorkPoolStatus(AutoEnum):
    """Enumeration of work pool statuses."""

    READY = AutoEnum.auto()
    NOT_READY = AutoEnum.auto()
    PAUSED = AutoEnum.auto()

    @property
    def display_name(self):
        return self.name.replace("_", " ").capitalize()

WorkQueue

Bases: ObjectBaseModel

An ORM representation of a work queue

Source code in src/prefect/client/schemas/objects.py

class WorkQueue(ObjectBaseModel):
    """An ORM representation of a work queue"""

    name: Name = Field(default=..., description="The name of the work queue.")
    description: Optional[str] = Field(
        default="", description="An optional description for the work queue."
    )
    is_paused: bool = Field(
        default=False, description="Whether or not the work queue is paused."
    )
    concurrency_limit: Optional[NonNegativeInteger] = Field(
        default=None, description="An optional concurrency limit for the work queue."
    )
    priority: PositiveInteger = Field(
        default=1,
        description=(
            "The queue's priority. Lower values are higher priority (1 is the highest)."
        ),
    )
    work_pool_name: Optional[str] = Field(default=None)
    # Will be required after a future migration
    work_pool_id: Optional[UUID] = Field(
        description="The work pool with which the queue is associated."
    )
    filter: Optional[QueueFilter] = Field(
        default=None,
        description="DEPRECATED: Filter criteria for the work queue.",
        deprecated=True,
    )
    last_polled: Optional[DateTime] = Field(
        default=None, description="The last time an agent polled this queue for work."
    )
    status: Optional[WorkQueueStatus] = Field(
        default=None, description="The queue status."
    )

WorkQueueHealthPolicy

Bases: PrefectBaseModel

Source code in src/prefect/client/schemas/objects.py

class WorkQueueHealthPolicy(PrefectBaseModel):
    maximum_late_runs: Optional[int] = Field(
        default=0,
        description=(
            "The maximum number of late runs in the work queue before it is deemed"
            " unhealthy. Defaults to `0`."
        ),
    )
    maximum_seconds_since_last_polled: Optional[int] = Field(
        default=60,
        description=(
            "The maximum number of time in seconds elapsed since work queue has been"
            " polled before it is deemed unhealthy. Defaults to `60`."
        ),
    )

    def evaluate_health_status(
        self, late_runs_count: int, last_polled: Optional[DateTime] = None
    ) -> bool:
        """
        Given empirical information about the state of the work queue, evaluate its health status.

        Args:
            late_runs: the count of late runs for the work queue.
            last_polled: the last time the work queue was polled, if available.

        Returns:
            bool: whether or not the work queue is healthy.
        """
        healthy = True
        if (
            self.maximum_late_runs is not None
            and late_runs_count > self.maximum_late_runs
        ):
            healthy = False

        if self.maximum_seconds_since_last_polled is not None:
            if (
                last_polled is None
                or pendulum.now("UTC").diff(last_polled).in_seconds()
                > self.maximum_seconds_since_last_polled
            ):
                healthy = False

        return healthy

evaluate_health_status(late_runs_count, last_polled=None)

Given empirical information about the state of the work queue, evaluate its health status.

Parameters:

Name	Type	Description	Default
late_runs		the count of late runs for the work queue.	required
last_polled	Optional[DateTime]	the last time the work queue was polled, if available.	None

Returns:

Name	Type	Description
bool	bool	whether or not the work queue is healthy.

Source code in src/prefect/client/schemas/objects.py

def evaluate_health_status(
    self, late_runs_count: int, last_polled: Optional[DateTime] = None
) -> bool:
    """
    Given empirical information about the state of the work queue, evaluate its health status.

    Args:
        late_runs: the count of late runs for the work queue.
        last_polled: the last time the work queue was polled, if available.

    Returns:
        bool: whether or not the work queue is healthy.
    """
    healthy = True
    if (
        self.maximum_late_runs is not None
        and late_runs_count > self.maximum_late_runs
    ):
        healthy = False

    if self.maximum_seconds_since_last_polled is not None:
        if (
            last_polled is None
            or pendulum.now("UTC").diff(last_polled).in_seconds()
            > self.maximum_seconds_since_last_polled
        ):
            healthy = False

    return healthy

WorkQueueStatus

Bases: AutoEnum

Enumeration of work queue statuses.

Source code in src/prefect/client/schemas/objects.py

class WorkQueueStatus(AutoEnum):
    """Enumeration of work queue statuses."""

    READY = AutoEnum.auto()
    NOT_READY = AutoEnum.auto()
    PAUSED = AutoEnum.auto()

Worker

Bases: ObjectBaseModel

An ORM representation of a worker

Source code in src/prefect/client/schemas/objects.py

class Worker(ObjectBaseModel):
    """An ORM representation of a worker"""

    name: str = Field(description="The name of the worker.")
    work_pool_id: UUID = Field(
        description="The work pool with which the queue is associated."
    )
    last_heartbeat_time: datetime.datetime = Field(
        None, description="The last time the worker process sent a heartbeat."
    )
    heartbeat_interval_seconds: Optional[int] = Field(
        default=None,
        description=(
            "The number of seconds to expect between heartbeats sent by the worker."
        ),
    )
    status: WorkerStatus = Field(
        WorkerStatus.OFFLINE,
        description="Current status of the worker.",
    )

WorkerStatus

Bases: AutoEnum

Enumeration of worker statuses.

Source code in src/prefect/client/schemas/objects.py

class WorkerStatus(AutoEnum):
    """Enumeration of worker statuses."""

    ONLINE = AutoEnum.auto()
    OFFLINE = AutoEnum.auto()

Workspace

Bases: PrefectBaseModel

A Prefect Cloud workspace.

Expected payload for each workspace returned by the me/workspaces route.

Source code in src/prefect/client/schemas/objects.py

class Workspace(PrefectBaseModel):
    """
    A Prefect Cloud workspace.

    Expected payload for each workspace returned by the `me/workspaces` route.
    """

    account_id: UUID = Field(..., description="The account id of the workspace.")
    account_name: str = Field(..., description="The account name.")
    account_handle: str = Field(..., description="The account's unique handle.")
    workspace_id: UUID = Field(..., description="The workspace id.")
    workspace_name: str = Field(..., description="The workspace name.")
    workspace_description: str = Field(..., description="Description of the workspace.")
    workspace_handle: str = Field(..., description="The workspace's unique handle.")
    model_config = ConfigDict(extra="ignore")

    @property
    def handle(self) -> str:
        """
        The full handle of the workspace as `account_handle` / `workspace_handle`
        """
        return self.account_handle + "/" + self.workspace_handle

    def api_url(self) -> str:
        """
        Generate the API URL for accessing this workspace
        """
        return (
            f"{PREFECT_CLOUD_API_URL.value()}"
            f"/accounts/{self.account_id}"
            f"/workspaces/{self.workspace_id}"
        )

    def ui_url(self) -> str:
        """
        Generate the UI URL for accessing this workspace
        """
        return (
            f"{PREFECT_CLOUD_UI_URL.value()}"
            f"/account/{self.account_id}"
            f"/workspace/{self.workspace_id}"
        )

    def __hash__(self):
        return hash(self.handle)

handle: str property

The full handle of the workspace as account_handle / workspace_handle

api_url()

Generate the API URL for accessing this workspace

Source code in src/prefect/client/schemas/objects.py

def api_url(self) -> str:
    """
    Generate the API URL for accessing this workspace
    """
    return (
        f"{PREFECT_CLOUD_API_URL.value()}"
        f"/accounts/{self.account_id}"
        f"/workspaces/{self.workspace_id}"
    )

ui_url()

Generate the UI URL for accessing this workspace

Source code in src/prefect/client/schemas/objects.py

def ui_url(self) -> str:
    """
    Generate the UI URL for accessing this workspace
    """
    return (
        f"{PREFECT_CLOUD_UI_URL.value()}"
        f"/account/{self.account_id}"
        f"/workspace/{self.workspace_id}"
    )