Enum GraphError 

#[non_exhaustive]
pub enum GraphError {
    ValidationError(String),
    ExecutionError(String),
    RoutingError(String),
    RecursionLimitReached(usize),
    NodeError(String),
    CheckpointError(String),
    CheckpointVersionConflict {
        checkpoint_id: String,
        expected: u64,
        actual: u64,
    },
    StateError(String),
    ExecutionInterrupted(String),
    ResumeError(String),
    InfiniteCycleError(String),
    OrphanNodeError(String),
    DuplicateEdgeError(String),
    MissingRouteTargetError(String),
    RuntimeError(String),
    InterruptRequest {
        payload: Value,
    },
    DynamicInterrupt {
        node: String,
        payload: Value,
    },
}

Errors that can occur during graph construction and execution.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

ValidationError(String)

A graph validation check failed.

ExecutionError(String)

An error occurred while executing the graph.

RoutingError(String)

An error occurred while routing between nodes.

RecursionLimitReached(usize)

The recursion limit was reached during execution.

NodeError(String)

A node reported an error.

CheckpointError(String)

A checkpoint operation failed.

CheckpointVersionConflict

Optimistic-concurrency conflict while editing a checkpoint (Checkpointer::update_state): the stored version no longer matches the version the caller expected.

Fields

checkpoint_id: String

Checkpoint the edit targeted.

expected: u64

Version the edit was based on.

actual: u64

Version currently stored.

StateError(String)

A state update or merge failed.

ExecutionInterrupted(String)

Execution was interrupted at the named node.

ResumeError(String)

Resuming execution failed.

InfiniteCycleError(String)

The graph contains a cycle with no path to END.

OrphanNodeError(String)

A node is unreachable from the entry point.

DuplicateEdgeError(String)

Two edges duplicate the same source-target pair.

MissingRouteTargetError(String)

A routing function returned a key with no matching target.

RuntimeError(String)

An unexpected runtime error occurred.

InterruptRequest

A node requested a runtime (human-in-the-loop) interrupt. This is a control-flow signal produced by a node so it can suspend mid-execution. The compiled graph converts it into a GraphError::DynamicInterrupt (after persisting a checkpoint) before it reaches the graph caller.

Fields

payload: Value

Payload describing the interrupt (the question to ask, context, …).

DynamicInterrupt

Execution was suspended by a node’s runtime interrupt. The checkpointer (when attached) has already persisted the run’s state, so a process restart can resume. Feed a human’s decision back in with crate::compiled::graph::CompiledGraph::resume_with_value.

Fields

node: String

The node that requested the interrupt (re-entered on resume).

payload: Value

The payload the node published when it suspended.

Trait Implementations

impl Debug for GraphError

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

Formats the value using the given formatter.

impl Display for GraphError

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

Formats the value using the given formatter.

impl Error for GraphError

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.