Enum TaskError 

pub enum TaskError {
    NodeError(NodeError),
    MissingTransition(String),
    MissingNode(String),
    TypeError(String),
    TaskActive,
    NotResumable,
    Incomplete,
    InvalidState(String),
    MissingInput(String),
    MissingOutput(String),
    NoSteps,
}

Errors returned while defining, running, or resuming a task.

Variants

NodeError(NodeError)

A registered node failed while executing.

MissingTransition(String)

A node was executed without an outgoing transition.

MissingNode(String)

A transition referenced a node that does not exist.

TypeError(String)

The task produced a final output with the wrong type.

TaskActive

run was called while the task still had live runtime state.

NotResumable

resume was called without paused or reset work to continue.

Incomplete

The task drained all work without finishing or pausing.

InvalidState(String)

The task runtime detected an internal inconsistency.

MissingInput(String)

A node was executed without the required input.

MissingOutput(String)

A node completed without the expected output.

NoSteps

The task does not have a valid start node and transition graph.

Implementations

impl TaskError

pub fn missing_transition(node_id: usize) -> Self

Creates a missing-transition error for node_id.

pub fn missing_node(node_id: usize) -> Self

Creates a missing-node error for node_id.

pub fn missing_input(node_id: usize) -> Self

Creates a missing-input error for node_id.

pub fn missing_output(node_id: usize) -> Self

Creates a missing-output error for node_id.

pub fn type_error<T: Any + Send>(output: &T) -> Self

Creates a type error describing the unexpected final output type.

pub fn invalid_state(message: impl Into<String>) -> Self

Creates an invalid-state error with a custom message.

Trait Implementations

impl Debug for TaskError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for TaskError

fn fmt(&self, __formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for TaskError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<NodeError> for TaskError

fn from(source: NodeError) -> Self

Converts to this type from the input type.